rename rpcx to zrpc

* add flag: force to generate api

* add flag: force to generate api

* format api template

* Revert "format api template"

.github/workflows/go.yml

@@ -7,7 +7,6 @@ on:
     branches: [ master ]
 
 jobs:
-
   build:
     name: Build
     runs-on: ubuntu-latest

.markdownlint.json

@@ -0,0 +1,6 @@
+{
+    "MD010": false,
+    "MD013": false,
+    "MD033": false,
+    "MD034": false
+}

core/breaker/breaker.go

@@ -5,12 +5,12 @@ import (
 	"fmt"
 	"strings"
 	"sync"
-	"time"
 
 	"github.com/tal-tech/go-zero/core/mathx"
 	"github.com/tal-tech/go-zero/core/proc"
 	"github.com/tal-tech/go-zero/core/stat"
 	"github.com/tal-tech/go-zero/core/stringx"
+	"github.com/tal-tech/go-zero/core/timex"
 )
 
 const (
@@ -195,23 +195,23 @@ type errorWindow struct {
 
 func (ew *errorWindow) add(reason string) {
 	ew.lock.Lock()
-	ew.reasons[ew.index] = fmt.Sprintf("%s %s", time.Now().Format(timeFormat), reason)
+	ew.reasons[ew.index] = fmt.Sprintf("%s %s", timex.Time().Format(timeFormat), reason)
 	ew.index = (ew.index + 1) % numHistoryReasons
 	ew.count = mathx.MinInt(ew.count+1, numHistoryReasons)
 	ew.lock.Unlock()
 }
 
 func (ew *errorWindow) String() string {
-	var builder strings.Builder
+	var reasons []string
 
 	ew.lock.Lock()
-	for i := ew.index + ew.count - 1; i >= ew.index; i-- {
-		builder.WriteString(ew.reasons[i%numHistoryReasons])
-		builder.WriteByte('\n')
+	// reverse order
+	for i := ew.index - 1; i >= ew.index-ew.count; i-- {
+		reasons = append(reasons, ew.reasons[(i+numHistoryReasons)%numHistoryReasons])
 	}
 	ew.lock.Unlock()
 
-	return builder.String()
+	return strings.Join(reasons, "\n")
 }
 
 type promiseWithReason struct {

core/breaker/breaker_test.go

@@ -2,7 +2,9 @@ package breaker
 
 import (
 	"errors"
+	"fmt"
 	"strconv"
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -33,6 +35,84 @@ func TestLogReason(t *testing.T) {
 	assert.Equal(t, numHistoryReasons, errs.count)
 }
 
+func TestErrorWindow(t *testing.T) {
+	tests := []struct {
+		name    string
+		reasons []string
+	}{
+		{
+			name: "no error",
+		},
+		{
+			name:    "one error",
+			reasons: []string{"foo"},
+		},
+		{
+			name:    "two errors",
+			reasons: []string{"foo", "bar"},
+		},
+		{
+			name:    "five errors",
+			reasons: []string{"first", "second", "third", "fourth", "fifth"},
+		},
+		{
+			name:    "six errors",
+			reasons: []string{"first", "second", "third", "fourth", "fifth", "sixth"},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			var ew errorWindow
+			for _, reason := range test.reasons {
+				ew.add(reason)
+			}
+			var reasons []string
+			if len(test.reasons) > numHistoryReasons {
+				reasons = test.reasons[len(test.reasons)-numHistoryReasons:]
+			} else {
+				reasons = test.reasons
+			}
+			for _, reason := range reasons {
+				assert.True(t, strings.Contains(ew.String(), reason), fmt.Sprintf("actual: %s", ew.String()))
+			}
+		})
+	}
+}
+
+func TestPromiseWithReason(t *testing.T) {
+	tests := []struct {
+		name   string
+		reason string
+		expect string
+	}{
+		{
+			name: "success",
+		},
+		{
+			name:   "success",
+			reason: "fail",
+			expect: "fail",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			promise := promiseWithReason{
+				promise: new(mockedPromise),
+				errWin:  new(errorWindow),
+			}
+			if len(test.reason) == 0 {
+				promise.Accept()
+			} else {
+				promise.Reject(test.reason)
+			}
+
+			assert.True(t, strings.Contains(promise.errWin.String(), test.expect))
+		})
+	}
+}
+
 func BenchmarkGoogleBreaker(b *testing.B) {
 	br := NewBreaker()
 	for i := 0; i < b.N; i++ {
@@ -41,3 +121,12 @@ func BenchmarkGoogleBreaker(b *testing.B) {
 		})
 	}
 }
+
+type mockedPromise struct {
+}
+
+func (m *mockedPromise) Accept() {
+}
+
+func (m *mockedPromise) Reject() {
+}

core/mr/mapreduce.go

@@ -16,7 +16,10 @@ const (
 	minWorkers     = 1
 )
 
-var ErrCancelWithNil = errors.New("mapreduce cancelled with nil")
+var (
+	ErrCancelWithNil  = errors.New("mapreduce cancelled with nil")
+	ErrReduceNoOutput = errors.New("reduce not writing value")
+)
 
 type (
 	GenerateFunc    func(source chan<- interface{})
@@ -76,7 +79,7 @@ func Map(generate GenerateFunc, mapper MapFunc, opts ...Option) chan interface{}
 	collector := make(chan interface{}, options.workers)
 	done := syncx.NewDoneChan()
 
-	go mapDispatcher(mapper, source, collector, done.Done(), options.workers)
+	go executeMappers(mapper, source, collector, done.Done(), options.workers)
 
 	return collector
 }
@@ -93,7 +96,14 @@ func MapReduceWithSource(source <-chan interface{}, mapper MapperFunc, reducer R
 	collector := make(chan interface{}, options.workers)
 	done := syncx.NewDoneChan()
 	writer := newGuardedWriter(output, done.Done())
+	var closeOnce sync.Once
 	var retErr errorx.AtomicError
+	finish := func() {
+		closeOnce.Do(func() {
+			done.Close()
+			close(output)
+		})
+	}
 	cancel := once(func(err error) {
 		if err != nil {
 			retErr.Set(err)
@@ -102,19 +112,24 @@ func MapReduceWithSource(source <-chan interface{}, mapper MapperFunc, reducer R
 		}
 
 		drain(source)
-		done.Close()
-		close(output)
+		finish()
 	})
 
 	go func() {
 		defer func() {
 			if r := recover(); r != nil {
 				cancel(fmt.Errorf("%v", r))
+			} else {
+				finish()
 			}
 		}()
 		reducer(collector, writer, cancel)
+		drain(collector)
 	}()
-	go mapperDispatcher(mapper, source, collector, done.Done(), cancel, options.workers)
+
+	go executeMappers(func(item interface{}, w Writer) {
+		mapper(item, w, cancel)
+	}, source, collector, done.Done(), options.workers)
 
 	value, ok := <-output
 	if err := retErr.Load(); err != nil {
@@ -122,13 +137,14 @@ func MapReduceWithSource(source <-chan interface{}, mapper MapperFunc, reducer R
 	} else if ok {
 		return value, nil
 	} else {
-		return nil, nil
+		return nil, ErrReduceNoOutput
 	}
 }
 
 func MapReduceVoid(generator GenerateFunc, mapper MapperFunc, reducer VoidReducerFunc, opts ...Option) error {
 	_, err := MapReduce(generator, mapper, func(input <-chan interface{}, writer Writer, cancel func(error)) {
 		reducer(input, cancel)
+		drain(input)
 		// We need to write a placeholder to let MapReduce to continue on reducer done,
 		// otherwise, all goroutines are waiting. The placeholder will be discarded by MapReduce.
 		writer.Write(lang.Placeholder)
@@ -213,20 +229,6 @@ func executeMappers(mapper MapFunc, input <-chan interface{}, collector chan<- i
 	}
 }
 
-func mapDispatcher(mapper MapFunc, input <-chan interface{}, collector chan<- interface{},
-	done <-chan lang.PlaceholderType, workers int) {
-	executeMappers(func(item interface{}, writer Writer) {
-		mapper(item, writer)
-	}, input, collector, done, workers)
-}
-
-func mapperDispatcher(mapper MapperFunc, input <-chan interface{}, collector chan<- interface{},
-	done <-chan lang.PlaceholderType, cancel func(error), workers int) {
-	executeMappers(func(item interface{}, writer Writer) {
-		mapper(item, writer, cancel)
-	}, input, collector, done, workers)
-}
-
 func newOptions() *mapReduceOptions {
 	return &mapReduceOptions{
 		workers: defaultWorkers,

core/mr/mapreduce_test.go

@@ -378,6 +378,22 @@ func TestMapReduceVoidCancelWithRemains(t *testing.T) {
 	assert.True(t, done.True())
 }
 
+func TestMapReduceWithoutReducerWrite(t *testing.T) {
+	uids := []int{1, 2, 3}
+	res, err := MapReduce(func(source chan<- interface{}) {
+		for _, uid := range uids {
+			source <- uid
+		}
+	}, func(item interface{}, writer Writer, cancel func(error)) {
+		writer.Write(item)
+	}, func(pipe <-chan interface{}, writer Writer, cancel func(error)) {
+		drain(pipe)
+		// not calling writer.Write(...), should not panic
+	})
+	assert.Equal(t, ErrReduceNoOutput, err)
+	assert.Nil(t, res)
+}
+
 func BenchmarkMapReduce(b *testing.B) {
 	b.ReportAllocs()
 

core/proc/shutdown.go

@@ -32,7 +32,7 @@ func AddWrapUpListener(fn func()) (waitForCalled func()) {
 	return wrapUpListeners.addListener(fn)
 }
 
-func SetTimeoutToForceQuit(duration time.Duration) {
+func SetTimeToForceQuit(duration time.Duration) {
 	delayTimeBeforeForceQuit = duration
 }
 

doc/bookstore-en.md

@@ -0,0 +1,616 @@
+# Rapid development of microservices - multiple RPCs
+
+English | [简体中文](bookstore.md)
+
+## 0. Why building microservices are so difficult
+
+To build a well working microservice, we need lots of knowledges from different aspects.
+
+* basic functionalities
+  1. concurrency control and rate limit, to avoid being brought down by unexpected inbound
+  2. service discovery, make sure new or terminated nodes are detected asap
+  3. load balancing, balance the traffic base on the throughput of nodes
+  4. timeout control, avoid the nodes continue to process the timed out requests
+  5. circuit breaker, load shedding, fail fast, protects the failure nodes to recover asap
+
+* advanced functionalities
+  1. authorization, make sure users can only access their own data
+  2. tracing, to understand the whole system and locate the specific problem quickly
+  3. logging, collects data and helps to backtrace problems
+  4. observability, no metrics, no optimization
+
+For any point listed above, we need a long article to describe the theory and the implementation. But for us, the developers, it’s very difficult to understand all the concepts and make it happen in our systems. Although, we can use the frameworks that have been well served busy sites. [go-zero](https://github.com/tal-tech/go-zero) is born for this purpose, especially for cloud-native microservice systems.
+
+As well, we always adhere to the idea that **prefer tools over conventions and documents**. We hope to reduce the boilerplate code as much as possible, and let developers focus on developing the business related code. For this purpose, we developed the tool  `goctl`.
+
+Let’s take the shorturl microservice as a quick example to demonstrate how to quickly create microservices by using [go-zero](https://github.com/tal-tech/go-zero). After finishing this tutorial, you’ll find that it’s so easy to write microservices!
+
+## 1. What is a bookstore service
+
+For simplicity, the bookstore service only contains two functionalities, adding books and quering prices.
+
+Writting this bookstore service is to demonstrate the complete flow of creating a microservice by using go-zero. But algorithms and detail implementations are quite simplified, and this bookstore service is not suitable for production use.
+
+## 2. Architecture of shorturl microservice
+
+<img src="images/bookstore-arch.png" alt="architecture" width="800" />
+
+## 3. goctl generated code overview
+
+All modules with green background are generated, and will be enabled when necessary. The modules with red background are handwritten code, which is typically business logic code.
+
+* API Gateway
+
+  <img src="images/api-gen.png" alt="api" width="800" />
+
+* RPC
+
+  <img src="images/rpc-gen.png" alt="rpc" width="800" />
+
+* model
+
+  <img src="images/model-gen.png" alt="model" width="800" />
+
+And now, let’s walk through the complete flow of quickly create a microservice with go-zero.
+
+## 4. Get started
+
+* install etcd, mysql, redis
+
+* install goctl
+
+  ```shell
+  GO111MODULE=on go get -u github.com/tal-tech/go-zero/tools/goctl
+  ```
+
+* create the working dir bookstore
+
+* in `bookstore` dir, execute `go mod init bookstore` to initialize `go.mod``
+
+## 5. Write code for API Gateway
+
+* use goctl to generate `api/bookstore.api`
+
+  ```Plain Text
+  goctl api -o bookstore.api
+  ```
+
+  for simplicity, the leading `info` block is removed, and the code looks like:
+
+  ```go
+  type (
+      addReq struct {
+          book  string `form:"book"`
+          price int64  `form:"price"`
+      }
+  
+      addResp struct {
+          ok bool `json:"ok"`
+      }
+  )
+  
+  type (
+      checkReq struct {
+          book string `form:"book"`
+      }
+  
+      checkResp struct {
+          found bool  `json:"found"`
+          price int64 `json:"price"`
+      }
+  )
+  
+  service bookstore-api {
+      @server(
+          handler: AddHandler
+      )
+      get /add(addReq) returns(addResp)
+  
+      @server(
+          handler: CheckHandler
+      )
+      get /check(checkReq) returns(checkResp)
+  }
+  ```
+
+  the usage of `type` keyword is the same as that in go, service is used to define get/post/head/delete api requests, described below:
+
+  * `service bookstore-api { defines the service name
+  * `@server` defines the properties that used in server side
+  * `handler` defines the handler name
+  * `get /add(addReq) returns(addResp)` defines this is a GET request, the request parameters, and the response parameters
+
+* generate the code for API Gateway by using goctl
+
+  ```shell
+  goctl api go -api bookstore.api -dir .
+  ```
+
+  the generated file structure looks like:
+
+  ```Plain Text
+  api
+  ├── bookstore.api                  // api definition
+  ├── bookstore.go                   // main entrance
+  ├── etc
+  │   └── bookstore-api.yaml         // configuration file
+  └── internal
+      ├── config
+      │   └── config.go              // configuration definition
+      ├── handler
+      │   ├── addhandler.go          // implements addHandler
+      │   ├── checkhandler.go        // implements checkHandler
+      │   └── routes.go              // routes definition
+      ├── logic
+      │   ├── addlogic.go            // implements AddLogic
+      │   └── checklogic.go          // implements CheckLogic
+      ├── svc
+      │   └── servicecontext.go      // defines ServiceContext
+      └── types
+          └── types.go               // defines request/response
+  ```
+
+* start API Gateway service, listens on port 8888 by default
+
+  ```shell
+  go run bookstore.go -f etc/bookstore-api.yaml
+  ```
+
+* test API Gateway service
+
+  ```shell
+  curl -i "http://localhost:8888/check?book=go-zero"
+  ```
+
+  response like:
+
+  ```http
+  HTTP/1.1 200 OK
+  Content-Type: application/json
+  Date: Thu, 03 Sep 2020 06:46:18 GMT
+  Content-Length: 25
+  
+  {"found":false,"price":0}
+  ```
+
+  You can see that the API Gateway service did nothing except returned a zero value. And let’s implement the business logic in rpc service.
+
+* you can modify `internal/svc/servicecontext.go` to pass dependencies if needed
+
+* implement logic in package `internal/logic`
+
+* you can use goctl to generate code for clients base on the .api file
+
+* till now, the client engineer can work with the api, don’t need to wait for the implementation of server side
+
+## 6. Write code for add rpc service
+
+* under directory `rpc/add` create `add.proto` file
+
+  ```shell
+  goctl rpc template -o add.proto
+  ```
+  
+  edit the file and make the code looks like:
+
+  ```protobuf
+  syntax = "proto3";
+  
+  package add;
+  
+  message addReq {
+      string book = 1;
+      int64 price = 2;
+  }
+  
+  message addResp {
+      bool ok = 1;
+  }
+  
+  service adder {
+      rpc add(addReq) returns(addResp);
+  }
+  ```
+  
+* use goctl to generate the rpc code, execute the following command in `rpc/add`
+
+  ```shell
+  goctl rpc proto -src add.proto
+  ```
+
+  the generated file structure looks like:
+
+  ```Plain Text
+  rpc/add
+  ├── add.go                      // rpc main entrance
+  ├── add.proto                   // rpc definition
+  ├── adder
+  │   ├── adder.go                // defines how rpc clients call this service
+  │   ├── adder_mock.go           // mock file, for test purpose
+  │   └── types.go                // request/response definition
+  ├── etc
+  │   └── add.yaml                // configuration file
+  ├── internal
+  │   ├── config
+  │   │   └── config.go           // configuration definition
+  │   ├── logic
+  │   │   └── addlogic.go         // add logic here
+  │   ├── server
+  │   │   └── adderserver.go      // rpc handler
+  │   └── svc
+  │       └── servicecontext.go   // defines service context, like dependencies
+  └── pb
+      └── add.pb.go
+  ```
+
+just run it, looks like:
+
+```shell
+  $ go run add.go -f etc/add.yaml
+  Starting rpc server at 127.0.0.1:8080...
+```
+
+you can change the listening port in file `etc/add.yaml`.
+
+## 7. Write code for check rpc service
+
+* under directory `rpc/check` create `check.proto` file
+
+  ```shell
+  goctl rpc template -o check.proto
+  ```
+  
+  edit the file and make the code looks like:
+
+  ```protobuf
+  syntax = "proto3";
+  
+  package check;
+  
+  message checkReq {
+      string book = 1;
+  }
+  
+  message checkResp {
+      bool found = 1;
+      int64 price = 2;
+  }
+  
+  service checker {
+      rpc check(checkReq) returns(checkResp);
+  }
+  ```
+  
+* use goctl to generate the rpc code, execute the following command in `rpc/check`
+
+  ```shell
+  goctl rpc proto -src check.proto
+  ```
+
+  the generated file structure looks like:
+
+  ```Plain Text
+  rpc/check
+  ├── check.go                    // rpc main entrance
+  ├── check.proto                 // rpc definition
+  ├── checker
+  │   ├── checker.go              // defines how rpc clients call this service
+  │   ├── checker_mock.go         // mock file, for test purpose
+  │   └── types.go                // request/response definition
+  ├── etc
+  │   └── check.yaml              // configuration file
+  ├── internal
+  │   ├── config
+  │   │   └── config.go           // configuration definition
+  │   ├── logic
+  │   │   └── checklogic.go       // check logic here
+  │   ├── server
+  │   │   └── checkerserver.go    // rpc handler
+  │   └── svc
+  │       └── servicecontext.go   // defines service context, like dependencies
+  └── pb
+      └── check.pb.go
+  ```
+
+  you can change the listening port in `etc/check.yaml`.
+
+  we need to change the port in `etc/check.yaml` to `8081`, because `8080` is used by `add` service.
+
+  just run it, looks like:
+  
+  ```shell
+  $ go run check.go -f etc/check.yaml
+  Starting rpc server at 127.0.0.1:8081...
+  ```
+
+## 8. Modify API Gateway to call add/check rpc service
+
+* modify the configuration file `bookstore-api.yaml`, add the following:
+
+  ```yaml
+  Add:
+    Etcd:
+      Hosts:
+        - localhost:2379
+      Key: add.rpc
+  Check:
+    Etcd:
+      Hosts:
+        - localhost:2379
+      Key: check.rpc
+  ```
+
+  automatically discover the add/check service by using etcd.
+
+* modify the file `internal/config/config.go`, add dependency on add/check service:
+
+  ```go
+  type Config struct {
+      rest.RestConf
+      Add   zrpc.RpcClientConf     // manual code
+      Check zrpc.RpcClientConf     // manual code
+  }
+  ```
+
+* modify the file `internal/svc/servicecontext.go`, like below:
+
+  ```go
+  type ServiceContext struct {
+      Config  config.Config
+      Adder   adder.Adder          // manual code
+      Checker checker.Checker      // manual code
+  }
+  
+  func NewServiceContext(c config.Config) *ServiceContext {
+      return &ServiceContext{
+          Config:  c,
+          Adder:   adder.NewAdder(zrpc.MustNewClient(c.Add)),         // manual code
+          Checker: checker.NewChecker(zrpc.MustNewClient(c.Check)),   // manual code
+      }
+  }
+  ```
+
+  passing the dependencies among services within ServiceContext.
+
+* modify the method `Add` in the file `internal/logic/addlogic.go`, looks like:
+
+  ```go
+  func (l *AddLogic) Add(req types.AddReq) (*types.AddResp, error) {
+      // manual code start
+      resp, err := l.svcCtx.Adder.Add(l.ctx, &adder.AddReq{
+          Book:  req.Book,
+          Price: req.Price,
+      })
+      if err != nil {
+          return nil, err
+      }
+  
+      return &types.AddResp{
+          Ok: resp.Ok,
+      }, nil
+      // manual code stop
+  }
+  ```
+
+  by calling the method `Add` of `adder` to add books into bookstore.
+
+* modify the file `internal/logic/checklogic.go`, looks like:
+
+  ```go
+  func (l *CheckLogic) Check(req types.CheckReq) (*types.CheckResp, error) {
+      // manual code start
+      resp, err := l.svcCtx.Checker.Check(l.ctx, &checker.CheckReq{
+          Book:  req.Book,
+      })
+      if err != nil {
+          return nil, err
+      }
+  
+      return &types.CheckResp{
+          Found: resp.Found,
+          Price: resp.Price,
+      }, nil
+      // manual code stop
+  }
+  ```
+
+  by calling the method `Check` of `checker` to check the prices from the bookstore.
+
+Till now, we’ve done the modification of API Gateway. All the manually added code are marked.
+
+## 9. Define the database schema, generate the code for CRUD+cache
+
+* under bookstore, create the directory `rpc/model`: `mkdir -p rpc/model`
+
+* under the directory rpc/model create the file called `book.sql`, contents as below:
+
+  ```sql
+  CREATE TABLE `book`
+  (
+    `book` varchar(255) NOT NULL COMMENT 'book name',
+    `price` int NOT NULL COMMENT 'book price',
+    PRIMARY KEY(`book`)
+  ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+  ```
+
+* create DB and table
+
+  ```sql
+  create database gozero;
+  ```
+
+  ```sql
+  source book.sql;
+  ```
+
+* under the directory `rpc/model` execute the following command to genrate CRUD+cache code, `-c` means using `redis cache`
+
+  ```shell
+  goctl model mysql ddl -c -src book.sql -dir .
+  ```
+
+  you can also generate the code from the database url by using `datasource` subcommand instead of `ddl`
+
+  the generated file structure looks like:
+
+  ```Plain Text
+  rpc/model
+  ├── bookstore.sql
+  ├── bookstoremodel.go     // CRUD+cache code
+  └── vars.go               // const and var definition
+  ```
+
+## 10. Modify add/check rpc to call crud+cache
+
+* modify `rpc/add/etc/add.yaml`, add the following:
+
+  ```yaml
+  DataSource: root:@tcp(localhost:3306)/gozero
+  Table: book
+  Cache:
+    - Host: localhost:6379
+  ```
+
+  you can use multiple redis as cache. redis node and cluster are both supported.
+
+* modify `rpc/add/internal/config.go`, like below:
+
+  ```go
+  type Config struct {
+      zrpc.RpcServerConf
+      DataSource string             // manual code
+      Table      string             // manual code
+      Cache      cache.CacheConf    // manual code
+  }
+  ```
+
+  added the configuration for mysql and redis cache.
+
+* modify `rpc/add/internal/svc/servicecontext.go` and `rpc/check/internal/svc/servicecontext.go`, like below:
+
+  ```go
+  type ServiceContext struct {
+      c     config.Config
+      Model *model.BookModel   // manual code
+  }
+  
+  func NewServiceContext(c config.Config) *ServiceContext {
+      return &ServiceContext{
+          c:             c,
+          Model: model.NewBookModel(sqlx.NewMysql(c.DataSource), c.Cache, c.Table), // manual code
+      }
+  }
+  ```
+
+* modify `rpc/add/internal/logic/addlogic.go`, like below:
+
+  ```go
+  func (l *AddLogic) Add(in *add.AddReq) (*add.AddResp, error) {
+      // manual code start
+      _, err := l.svcCtx.Model.Insert(model.Book{
+          Book:  in.Book,
+          Price: in.Price,
+      })
+      if err != nil {
+          return nil, err
+      }
+  
+      return &add.AddResp{
+          Ok: true,
+      }, nil
+      // manual code stop
+  }
+  ```
+
+* modify `rpc/check/internal/logic/checklogic.go`, like below:
+
+  ```go
+  func (l *CheckLogic) Check(in *check.CheckReq) (*check.CheckResp, error) {
+      // manual code start
+      resp, err := l.svcCtx.Model.FindOne(in.Book)
+      if err != nil {
+          return nil, err
+      }
+  
+      return &check.CheckResp{
+          Found: true,
+          Price: resp.Price,
+      }, nil
+      // manual code stop
+  }
+  ```
+  
+  till now, we finished modifing the code, all the modified code is marked.
+
+## 11. Call shorten and expand services
+
+* call add api
+
+  ```shell
+  curl -i "http://localhost:8888/add?book=go-zero&price=10"
+  ```
+
+  response like:
+
+  ```http
+  HTTP/1.1 200 OK
+  Content-Type: application/json
+  Date: Thu, 03 Sep 2020 09:42:13 GMT
+  Content-Length: 11
+  
+  {"ok":true}
+  ```
+
+* call check api
+
+  ```shell
+  curl -i "http://localhost:8888/check?book=go-zero"
+  ```
+
+  response like:
+
+  ```http
+  HTTP/1.1 200 OK
+  Content-Type: application/json
+  Date: Thu, 03 Sep 2020 09:47:34 GMT
+  Content-Length: 25
+  
+  {"found":true,"price":10}
+  ```
+
+## 12. Benchmark
+
+Because benchmarking the write requests depends on the write throughput of mysql, we only benchmarked the check api. We read the data from mysql and cache it in redis. For simplicity, I only check one book, because of cache, the effect is the same for multiple books.
+
+Before benchmark, we need to change the max open files:
+
+```shel
+ulimit -n 20000
+```
+
+And change the log level to error, to avoid too many logs affect the benchmark. Add the following in every yaml file:
+
+```yaml
+Log:
+	Level: error
+```
+
+![Benchmark](images/bookstore-benchmark.png)
+
+as shown above, in my MacBook Pro, the QPS is like 30K+.
+
+## 13. Full code
+
+[https://github.com/tal-tech/go-zero/tree/master/example/bookstore](https://github.com/tal-tech/go-zero/tree/master/example/bookstore)
+
+## 14. Conclusion
+
+We always adhere to **prefer tools over conventions and documents**.
+
+go-zero is not only a framework, but also a tool to simplify and standardize the building of micoservice systems.
+
+We not only keep the framework simple, but also encapsulate the complexity into the framework. And the developers are free from building the difficult and boilerplate code. Then we get the rapid development and less failure.
+
+For the generated code by goctl, lots of microservice components are included, like concurrency control, adaptive circuit breaker, adaptive load shedding, auto cache control etc. And it’s easy to deal with the busy sites.
+
+If you have any ideas that can help us to improve the productivity, tell me any time! 👏

doc/bookstore.md

@@ -0,0 +1,616 @@
+# 快速构建微服务-多RPC版
+
+[English](bookstore-en.md) | 简体中文
+
+## 0. 为什么说做好微服务很难
+
+要想做好微服务，我们需要理解和掌握的知识点非常多，从几个维度上来说：
+
+* 基本功能层面
+  1. 并发控制&限流，避免服务被突发流量击垮
+  2. 服务注册与服务发现，确保能够动态侦测增减的节点
+  3. 负载均衡，需要根据节点承受能力分发流量
+  4. 超时控制，避免对已超时请求做无用功
+  5. 熔断设计，快速失败，保障故障节点的恢复能力
+
+* 高阶功能层面
+  1. 请求认证，确保每个用户只能访问自己的数据
+  2. 链路追踪，用于理解整个系统和快速定位特定请求的问题
+  3. 日志，用于数据收集和问题定位
+  4. 可观测性，没有度量就没有优化
+
+对于其中每一点，我们都需要用很长的篇幅来讲述其原理和实现，那么对我们后端开发者来说，要想把这些知识点都掌握并落实到业务系统里，难度是非常大的，不过我们可以依赖已经被大流量验证过的框架体系。[go-zero微服务框架](https://github.com/tal-tech/go-zero)就是为此而生。
+
+另外，我们始终秉承**工具大于约定和文档**的理念。我们希望尽可能减少开发人员的心智负担，把精力都投入到产生业务价值的代码上，减少重复代码的编写，所以我们开发了`goctl`工具。
+
+下面我通过书店服务来演示通过[go-zero](https://github.com/tal-tech/go-zero)快速的创建微服务的流程，走完一遍，你就会发现：原来编写微服务如此简单！
+
+## 1. 书店服务示例简介
+
+为了教程简单，我们用书店服务做示例，并且只实现其中的增加书目和检查价格功能。
+
+写此书店服务是为了从整体上演示go-zero构建完整微服务的过程，实现细节尽可能简化了。
+
+## 2. 书店微服务架构图
+
+<img src="images/bookstore-arch.png" alt="架构图" width="800" />
+
+## 3. goctl各层代码生成一览
+
+所有绿色背景的功能模块是自动生成的，按需激活，红色模块是需要自己写的，也就是增加下依赖，编写业务特有逻辑，各层示意图分别如下：
+
+* API Gateway
+
+  <img src="images/bookstore-api.png" alt="api" width="800" />
+
+* RPC
+
+  <img src="images/bookstore-rpc.png" alt="架构图" width="800" />
+
+* model
+
+  <img src="images/bookstore-model.png" alt="model" width="800" />
+
+下面我们来一起完整走一遍快速构建微服务的流程，Let’s `Go`!🏃‍♂️
+
+## 4. 准备工作
+
+* 安装etcd, mysql, redis
+
+* 安装goctl工具
+
+  ```shell
+  GO111MODULE=on GOPROXY=https://goproxy.cn/,direct go get -u github.com/tal-tech/go-zero/tools/goctl
+  ```
+
+* 创建工作目录`bookstore`
+
+* 在`bookstore`目录下执行`go mod init bookstore`初始化`go.mod`
+
+## 5. 编写API Gateway代码
+
+* 在`bookstore/api`目录下通过goctl生成`api/bookstore.api`：
+
+  ```bash
+  goctl api -o bookstore.api
+  ```
+
+  编辑`bookstore.api`，为了简洁，去除了文件开头的`info`，代码如下：
+
+  ```go
+  type (
+      addReq struct {
+          book  string `form:"book"`
+          price int64  `form:"price"`
+      }
+  
+      addResp struct {
+          ok bool `json:"ok"`
+      }
+  )
+  
+  type (
+      checkReq struct {
+          book string `form:"book"`
+      }
+  
+      checkResp struct {
+          found bool  `json:"found"`
+          price int64 `json:"price"`
+      }
+  )
+  
+  service bookstore-api {
+      @server(
+          handler: AddHandler
+      )
+      get /add(addReq) returns(addResp)
+  
+      @server(
+          handler: CheckHandler
+      )
+      get /check(checkReq) returns(checkResp)
+  }
+  ```
+
+  type用法和go一致，service用来定义get/post/head/delete等api请求，解释如下：
+
+  * `service bookstore-api {`这一行定义了service名字
+  * `@server`部分用来定义server端用到的属性
+  * `handler`定义了服务端handler名字
+  * `get /add(addReq) returns(addResp)`定义了get方法的路由、请求参数、返回参数等
+
+* 使用goctl生成API Gateway代码
+
+  ```shell
+  goctl api go -api bookstore.api -dir .
+  ```
+
+  生成的文件结构如下：
+
+  ```Plain Text
+  api
+  ├── bookstore.api                  // api定义
+  ├── bookstore.go                   // main入口定义
+  ├── etc
+  │   └── bookstore-api.yaml         // 配置文件
+  └── internal
+      ├── config
+      │   └── config.go              // 定义配置
+      ├── handler
+      │   ├── addhandler.go          // 实现addHandler
+      │   ├── checkhandler.go        // 实现checkHandler
+      │   └── routes.go              // 定义路由处理
+      ├── logic
+      │   ├── addlogic.go            // 实现AddLogic
+      │   └── checklogic.go          // 实现CheckLogic
+      ├── svc
+      │   └── servicecontext.go      // 定义ServiceContext
+      └── types
+          └── types.go               // 定义请求、返回结构体
+  ```
+
+* 启动API Gateway服务，默认侦听在8888端口
+
+  ```shell
+  go run bookstore.go -f etc/bookstore-api.yaml
+  ```
+
+* 测试API Gateway服务
+
+  ```shell
+  curl -i "http://localhost:8888/check?book=go-zero"
+  ```
+
+  返回如下：
+
+  ```http
+  HTTP/1.1 200 OK
+  Content-Type: application/json
+  Date: Thu, 03 Sep 2020 06:46:18 GMT
+  Content-Length: 25
+  
+  {"found":false,"price":0}
+  ```
+
+  可以看到我们API Gateway其实啥也没干，就返回了个空值，接下来我们会在rpc服务里实现业务逻辑
+
+* 可以修改`internal/svc/servicecontext.go`来传递服务依赖（如果需要）
+
+* 实现逻辑可以修改`internal/logic`下的对应文件
+
+* 可以通过`goctl`生成各种客户端语言的api调用代码
+
+* 到这里，你已经可以通过goctl生成客户端代码给客户端同学并行开发了，支持多种语言，详见文档
+
+## 6. 编写add rpc服务
+
+* 在`rpc/add`目录下编写`add.proto`文件
+
+  可以通过命令生成proto文件模板
+
+  ```shell
+  goctl rpc template -o add.proto
+  ```
+
+  修改后文件内容如下：
+
+  ```protobuf
+  syntax = "proto3";
+  
+  package add;
+  
+  message addReq {
+      string book = 1;
+      int64 price = 2;
+  }
+  
+  message addResp {
+      bool ok = 1;
+  }
+  
+  service adder {
+      rpc add(addReq) returns(addResp);
+  }
+  ```
+
+* 用`goctl`生成rpc代码，在`rpc/add`目录下执行命令
+
+  ```shell
+  goctl rpc proto -src add.proto
+  ```
+
+  文件结构如下：
+
+  ```Plain Text
+  rpc/add
+  ├── add.go                      // rpc服务main函数
+  ├── add.proto                   // rpc接口定义
+  ├── adder
+  │   ├── adder.go                // 提供了外部调用方法，无需修改
+  │   ├── adder_mock.go           // mock方法，测试用
+  │   └── types.go                // request/response结构体定义
+  ├── etc
+  │   └── add.yaml                // 配置文件
+  ├── internal
+  │   ├── config
+  │   │   └── config.go           // 配置定义
+  │   ├── logic
+  │   │   └── addlogic.go         // add业务逻辑在这里实现
+  │   ├── server
+  │   │   └── adderserver.go      // 调用入口, 不需要修改
+  │   └── svc
+  │       └── servicecontext.go   // 定义ServiceContext，传递依赖
+  └── pb
+      └── add.pb.go
+  ```
+
+直接可以运行，如下：
+
+```shell
+  $ go run add.go -f etc/add.yaml
+  Starting rpc server at 127.0.0.1:8080...
+```
+
+`etc/add.yaml`文件里可以修改侦听端口等配置
+
+## 7. 编写check rpc服务
+
+* 在`rpc/check`目录下编写`check.proto`文件
+
+  可以通过命令生成proto文件模板
+
+  ```shell
+  goctl rpc template -o check.proto
+  ```
+
+  修改后文件内容如下：
+
+  ```protobuf
+  syntax = "proto3";
+  
+  package check;
+  
+  message checkReq {
+      string book = 1;
+  }
+  
+  message checkResp {
+      bool found = 1;
+      int64 price = 2;
+  }
+  
+  service checker {
+      rpc check(checkReq) returns(checkResp);
+  }
+  ```
+
+* 用`goctl`生成rpc代码，在`rpc/check`目录下执行命令
+
+  ```shell
+  goctl rpc proto -src check.proto
+  ```
+
+  文件结构如下：
+
+  ```Plain Text
+  rpc/check
+  ├── check.go                    // rpc服务main函数
+  ├── check.proto                 // rpc接口定义
+  ├── checker
+  │   ├── checker.go              // 提供了外部调用方法，无需修改
+  │   ├── checker_mock.go         // mock方法，测试用
+  │   └── types.go                // request/response结构体定义
+  ├── etc
+  │   └── check.yaml              // 配置文件
+  ├── internal
+  │   ├── config
+  │   │   └── config.go           // 配置定义
+  │   ├── logic
+  │   │   └── checklogic.go       // check业务逻辑在这里实现
+  │   ├── server
+  │   │   └── checkerserver.go    // 调用入口, 不需要修改
+  │   └── svc
+  │       └── servicecontext.go   // 定义ServiceContext，传递依赖
+  └── pb
+      └── check.pb.go
+  ```
+
+  `etc/check.yaml`文件里可以修改侦听端口等配置
+
+  需要修改`etc/check.yaml`的端口为`8081`，因为`8080`已经被`add`服务使用了，直接可以运行，如下：
+
+  ```shell
+  $ go run check.go -f etc/check.yaml
+  Starting rpc server at 127.0.0.1:8081...
+  ```
+
+## 8. 修改API Gateway代码调用add/check rpc服务
+
+* 修改配置文件`bookstore-api.yaml`，增加如下内容
+
+  ```yaml
+  Add:
+    Etcd:
+      Hosts:
+        - localhost:2379
+      Key: add.rpc
+  Check:
+    Etcd:
+      Hosts:
+        - localhost:2379
+      Key: check.rpc
+  ```
+
+  通过etcd自动去发现可用的add/check服务
+
+* 修改`internal/config/config.go`如下，增加add/check服务依赖
+
+  ```go
+  type Config struct {
+      rest.RestConf
+      Add   zrpc.RpcClientConf     // 手动代码
+      Check zrpc.RpcClientConf     // 手动代码
+  }
+  ```
+
+* 修改`internal/svc/servicecontext.go`，如下：
+
+  ```go
+  type ServiceContext struct {
+      Config  config.Config
+      Adder   adder.Adder          // 手动代码
+      Checker checker.Checker      // 手动代码
+  }
+  
+  func NewServiceContext(c config.Config) *ServiceContext {
+      return &ServiceContext{
+          Config:  c,
+          Adder:   adder.NewAdder(zrpc.MustNewClient(c.Add)),         // 手动代码
+          Checker: checker.NewChecker(zrpc.MustNewClient(c.Check)),   // 手动代码
+      }
+  }
+  ```
+
+  通过ServiceContext在不同业务逻辑之间传递依赖
+
+* 修改`internal/logic/addlogic.go`里的`Add`方法，如下：
+
+  ```go
+  func (l *AddLogic) Add(req types.AddReq) (*types.AddResp, error) {
+      // 手动代码开始
+      resp, err := l.svcCtx.Adder.Add(l.ctx, &adder.AddReq{
+          Book:  req.Book,
+          Price: req.Price,
+      })
+      if err != nil {
+          return nil, err
+      }
+  
+      return &types.AddResp{
+          Ok: resp.Ok,
+      }, nil
+      // 手动代码结束
+  }
+  ```
+
+  通过调用`adder`的`Add`方法实现添加图书到bookstore系统
+
+* 修改`internal/logic/checklogic.go`里的`Check`方法，如下：
+
+  ```go
+  func (l *CheckLogic) Check(req types.CheckReq) (*types.CheckResp, error) {
+      // 手动代码开始
+      resp, err := l.svcCtx.Checker.Check(l.ctx, &checker.CheckReq{
+          Book:  req.Book,
+      })
+      if err != nil {
+          return nil, err
+      }
+  
+      return &types.CheckResp{
+          Found: resp.Found,
+          Price: resp.Price,
+      }, nil
+      // 手动代码结束
+  }
+  ```
+
+  通过调用`checker`的`Check`方法实现从bookstore系统中查询图书的价格
+
+## 9. 定义数据库表结构，并生成CRUD+cache代码
+
+* bookstore下创建`rpc/model`目录：`mkdir -p rpc/model`
+
+* 在rpc/model目录下编写创建book表的sql文件`book.sql`，如下：
+
+  ```sql
+  CREATE TABLE `book`
+  (
+    `book` varchar(255) NOT NULL COMMENT 'book name',
+    `price` int NOT NULL COMMENT 'book price',
+    PRIMARY KEY(`book`)
+  ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+  ```
+
+* 创建DB和table
+
+  ```sql
+  create database gozero;
+  ```
+
+  ```sql
+  source book.sql;
+  ```
+
+* 在`rpc/model`目录下执行如下命令生成CRUD+cache代码，`-c`表示使用`redis cache`
+
+  ```shell
+  goctl model mysql ddl -c -src book.sql -dir .
+  ```
+
+  也可以用`datasource`命令代替`ddl`来指定数据库链接直接从schema生成
+
+  生成后的文件结构如下：
+
+  ```Plain Text
+  rpc/model
+  ├── bookstore.sql
+  ├── bookstoremodel.go     // CRUD+cache代码
+  └── vars.go               // 定义常量和变量
+  ```
+
+## 10. 修改add/check rpc代码调用crud+cache代码
+
+* 修改`rpc/add/etc/add.yaml`和`rpc/check/etc/check.yaml`，增加如下内容：
+
+  ```yaml
+  DataSource: root:@tcp(localhost:3306)/gozero
+  Table: book
+  Cache:
+    - Host: localhost:6379
+  ```
+
+  可以使用多个redis作为cache，支持redis单点或者redis集群
+
+* 修改`rpc/add/internal/config.go`和`rpc/check/internal/config.go`，如下：
+
+  ```go
+  type Config struct {
+      zrpc.RpcServerConf
+      DataSource string             // 手动代码
+      Table      string             // 手动代码
+      Cache      cache.CacheConf    // 手动代码
+  }
+  ```
+
+  增加了mysql和redis cache配置
+
+* 修改`rpc/add/internal/svc/servicecontext.go`和`rpc/check/internal/svc/servicecontext.go`，如下：
+
+  ```go
+  type ServiceContext struct {
+      c     config.Config
+      Model *model.BookModel   // 手动代码
+  }
+  
+  func NewServiceContext(c config.Config) *ServiceContext {
+      return &ServiceContext{
+          c:             c,
+          Model: model.NewBookModel(sqlx.NewMysql(c.DataSource), c.Cache, c.Table), // 手动代码
+      }
+  }
+  ```
+
+* 修改`rpc/add/internal/logic/addlogic.go`，如下：
+
+  ```go
+  func (l *AddLogic) Add(in *add.AddReq) (*add.AddResp, error) {
+      // 手动代码开始
+      _, err := l.svcCtx.Model.Insert(model.Book{
+          Book:  in.Book,
+          Price: in.Price,
+      })
+      if err != nil {
+          return nil, err
+      }
+  
+      return &add.AddResp{
+          Ok: true,
+      }, nil
+      // 手动代码结束
+  }
+  ```
+
+* 修改`rpc/check/internal/logic/checklogic.go`，如下：
+
+  ```go
+  func (l *CheckLogic) Check(in *check.CheckReq) (*check.CheckResp, error) {
+      // 手动代码开始
+      resp, err := l.svcCtx.Model.FindOne(in.Book)
+      if err != nil {
+          return nil, err
+      }
+  
+      return &check.CheckResp{
+          Found: true,
+          Price: resp.Price,
+      }, nil
+      // 手动代码结束
+  }
+  ```
+  
+  至此代码修改完成，凡事手动修改的代码我加了标注
+
+## 11. 完整调用演示
+
+* add api调用
+
+  ```shell
+  curl -i "http://localhost:8888/add?book=go-zero&price=10"
+  ```
+
+  返回如下：
+
+  ```http
+  HTTP/1.1 200 OK
+  Content-Type: application/json
+  Date: Thu, 03 Sep 2020 09:42:13 GMT
+  Content-Length: 11
+  
+  {"ok":true}
+  ```
+
+* check api调用
+
+  ```shell
+  curl -i "http://localhost:8888/check?book=go-zero"
+  ```
+
+  返回如下：
+
+  ```http
+  HTTP/1.1 200 OK
+  Content-Type: application/json
+  Date: Thu, 03 Sep 2020 09:47:34 GMT
+  Content-Length: 25
+  
+  {"found":true,"price":10}
+  ```
+
+## 12. Benchmark
+
+因为写入依赖于mysql的写入速度，就相当于压mysql了，所以压测只测试了check接口，相当于从mysql里读取并利用缓存，为了方便，直接压这一本书，因为有缓存，多本书也是一样的，对压测结果没有影响。
+
+压测之前，让我们先把打开文件句柄数调大：
+
+```shel
+ulimit -n 20000
+```
+
+并日志的等级改为`error`，防止过多的info影响压测结果，在每个yaml配置文件里加上如下：
+
+```yaml
+Log:
+	Level: error
+```
+
+![Benchmark](images/bookstore-benchmark.png)
+
+可以看出在我的MacBook Pro上能达到3万+的qps。
+
+## 13. 完整代码
+
+[https://github.com/tal-tech/go-zero/tree/master/example/bookstore](https://github.com/tal-tech/go-zero/tree/master/example/bookstore)
+
+## 14. 总结
+
+我们一直强调**工具大于约定和文档**。
+
+go-zero不只是一个框架，更是一个建立在框架+工具基础上的，简化和规范了整个微服务构建的技术体系。
+
+我们在保持简单的同时也尽可能把微服务治理的复杂度封装到了框架内部，极大的降低了开发人员的心智负担，使得业务开发得以快速推进。
+
+通过go-zero+goctl生成的代码，包含了微服务治理的各种组件，包括：并发控制、自适应熔断、自适应降载、自动缓存控制等，可以轻松部署以承载巨大访问量。
+
+有任何好的提升工程效率的想法，随时欢迎交流！👏

doc/breaker.md

@@ -1,4 +1,5 @@
 # 熔断机制设计
 
 ## 设计目的
-* 依赖的服务出现大规模故障时，调用方应该尽可能少调用，降低故障服务的压力，使之尽快恢复服务
+
+* 依赖的服务出现大规模故障时，调用方应该尽可能少调用，降低故障服务的压力，使之尽快恢复服务

doc/collection.md

@@ -0,0 +1,111 @@
+# 通过 collection.Cache 进行缓存
+
+go-zero微服务框架中提供了许多开箱即用的工具，好的工具不仅能提升服务的性能而且还能提升代码的鲁棒性避免出错，实现代码风格的统一方便他人阅读等等，本系列文章将分别介绍go-zero框架中工具的使用及其实现原理  
+
+## 进程内缓存工具[collection.Cache](https://github.com/tal-tech/go-zero/tree/master/core/collection/cache.go)
+
+在做服务器开发的时候，相信都会遇到使用缓存的情况，go-zero 提供的简单的缓存封装 **collection.Cache**，简单使用方式如下
+
+```go
+// 初始化 cache，其中 WithLimit 可以指定最大缓存的数量
+c, err := collection.NewCache(time.Minute, collection.WithLimit(10000))
+if err != nil {
+  panic(err)
+}
+
+// 设置缓存
+c.Set("key", user)
+
+// 获取缓存，ok：是否存在
+v, ok := c.Get("key")
+
+// 删除缓存
+c.Del("key")
+
+// 获取缓存，如果 key 不存在的，则会调用 func 去生成缓存
+v, err := c.Take("key", func() (interface{}, error) {
+  return user, nil
+})
+```
+
+cache 实现的建的功能包括
+
+* 缓存自动失效，可以指定过期时间
+* 缓存大小限制，可以指定缓存个数
+* 缓存增删改
+* 缓存命中率统计
+* 并发安全
+* 缓存击穿
+
+实现原理：
+Cache 自动失效，是采用 TimingWheel(https://github.com/tal-tech/go-zero/blob/master/core/collection/timingwheel.go) 进行管理的
+
+``` go
+timingWheel, err := NewTimingWheel(time.Second, slots, func(k, v interface{}) {
+		key, ok := k.(string)
+		if !ok {
+			return
+		}
+
+		cache.Del(key)
+})
+```
+
+Cache 大小限制，是采用 LRU 淘汰策略，在新增缓存的时候会去检查是否已经超出过限制，具体代码在 keyLru 中实现
+
+``` go
+func (klru *keyLru) add(key string) {
+	if elem, ok := klru.elements[key]; ok {
+		klru.evicts.MoveToFront(elem)
+		return
+	}
+
+	// Add new item
+	elem := klru.evicts.PushFront(key)
+	klru.elements[key] = elem
+
+	// Verify size not exceeded
+	if klru.evicts.Len() > klru.limit {
+		klru.removeOldest()
+	}
+}
+```
+
+Cache 的命中率统计，是在代码中实现 cacheStat,在缓存命中丢失的时候自动统计，并且会定时打印使用的命中率, qps 等状态.
+
+打印的具体效果如下
+
+```go
+cache(proc) - qpm: 2, hit_ratio: 50.0%, elements: 0, hit: 1, miss: 1
+```
+
+缓存击穿包含是使用 syncx.SharedCalls(https://github.com/tal-tech/go-zero/blob/master/core/syncx/sharedcalls.go) 进行实现的，就是将同时请求同一个 key 的请求, 关于 sharedcalls 后续会继续补充。 相关具体实现是在:
+
+```go
+func (c *Cache) Take(key string, fetch func() (interface{}, error)) (interface{}, error) {
+	val, fresh, err := c.barrier.DoEx(key, func() (interface{}, error) {
+		v, e := fetch()
+		if e != nil {
+			return nil, e
+		}
+
+		c.Set(key, v)
+		return v, nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	if fresh {
+		c.stats.IncrementMiss()
+		return val, nil
+	} else {
+		// got the result from previous ongoing query
+		c.stats.IncrementHit()
+	}
+
+	return val, nil
+}
+```
+
+本文主要介绍了go-zero框架中的 Cache 工具，在实际的项目中非常实用。用好工具对于提升服务性能和开发效率都有很大的帮助，希望本篇文章能给大家带来一些收获。

doc/goctl-model-sql.md

@@ -0,0 +1,272 @@
+# Goctl Model
+
+goctl model 为go-zero下的工具模块中的组件之一，目前支持识别mysql ddl进行model层代码生成，通过命令行或者idea插件（即将支持）可以有选择地生成带redis cache或者不带redis cache的代码逻辑。
+
+## 快速开始
+
+* 通过ddl生成
+
+    ```shell script
+    goctl model mysql ddl -src="./sql/user.sql" -dir="./sql/model" -c=true
+    ```
+
+    执行上述命令后即可快速生成CURD代码。
+
+    ```Plain Text
+    model
+    │   ├── error.go
+    │   └── usermodel.go
+    ```
+
+* 通过datasource生成
+
+    ```shell script
+    goctl model mysql datasource -url="user:password@tcp(127.0.0.1:3306)/database" -table="table1,table2"  -dir="./model"
+    ```
+
+* 生成代码示例
+  
+  ``` go
+    package model
+
+    import (
+    	"database/sql"
+    	"fmt"
+    	"strings"
+    	"time"
+
+    	"github.com/tal-tech/go-zero/core/stores/cache"
+    	"github.com/tal-tech/go-zero/core/stores/sqlc"
+    	"github.com/tal-tech/go-zero/core/stores/sqlx"
+    	"github.com/tal-tech/go-zero/core/stringx"
+    	"github.com/tal-tech/go-zero/tools/goctl/model/sql/builderx"
+    )
+
+    var (
+    	userFieldNames          = builderx.FieldNames(&User{})
+    	userRows                = strings.Join(userFieldNames, ",")
+    	userRowsExpectAutoSet   = strings.Join(stringx.Remove(userFieldNames, "id", "create_time", "update_time"), ",")
+    	userRowsWithPlaceHolder = strings.Join(stringx.Remove(userFieldNames, "id", "create_time", "update_time"), "=?,") + "=?"
+
+    	cacheUserMobilePrefix = "cache#User#mobile#"
+    	cacheUserIdPrefix     = "cache#User#id#"
+    	cacheUserNamePrefix   = "cache#User#name#"
+    )
+
+    type (
+    	UserModel struct {
+    		sqlc.CachedConn
+    		table string
+    	}
+
+    	User struct {
+    		Id         int64     `db:"id"`
+    		Name       string    `db:"name"`     // 用户名称
+    		Password   string    `db:"password"` // 用户密码
+    		Mobile     string    `db:"mobile"`   // 手机号
+    		Gender     string    `db:"gender"`   // 男｜女｜未公开
+    		Nickname   string    `db:"nickname"` // 用户昵称
+    		CreateTime time.Time `db:"create_time"`
+    		UpdateTime time.Time `db:"update_time"`
+    	}
+    )
+
+    func NewUserModel(conn sqlx.SqlConn, c cache.CacheConf, table string) *UserModel {
+    	return &UserModel{
+    		CachedConn: sqlc.NewConn(conn, c),
+    		table:      table,
+    	}
+    }
+
+    func (m *UserModel) Insert(data User) (sql.Result, error) {
+    	query := `insert into ` + m.table + `(` + userRowsExpectAutoSet + `) value (?, ?, ?, ?, ?)`
+    	return m.ExecNoCache(query, data.Name, data.Password, data.Mobile, data.Gender, data.Nickname)
+    }
+
+    func (m *UserModel) FindOne(id int64) (*User, error) {
+    	userIdKey := fmt.Sprintf("%s%v", cacheUserIdPrefix, id)
+    	var resp User
+    	err := m.QueryRow(&resp, userIdKey, func(conn sqlx.SqlConn, v interface{}) error {
+    		query := `select ` + userRows + ` from ` + m.table + ` where id = ? limit 1`
+    		return conn.QueryRow(v, query, id)
+    	})
+    	switch err {
+    	case nil:
+    		return &resp, nil
+    	case sqlc.ErrNotFound:
+    		return nil, ErrNotFound
+    	default:
+    		return nil, err
+    	}
+    }
+
+    func (m *UserModel) FindOneByName(name string) (*User, error) {
+    	userNameKey := fmt.Sprintf("%s%v", cacheUserNamePrefix, name)
+    	var resp User
+    	err := m.QueryRowIndex(&resp, userNameKey, func(primary interface{}) string {
+    		return fmt.Sprintf("%s%v", cacheUserIdPrefix, primary)
+    	}, func(conn sqlx.SqlConn, v interface{}) (i interface{}, e error) {
+    		query := `select ` + userRows + ` from ` + m.table + ` where name = ? limit 1`
+    		if err := conn.QueryRow(&resp, query, name); err != nil {
+    			return nil, err
+    		}
+    		return resp.Id, nil
+    	}, func(conn sqlx.SqlConn, v, primary interface{}) error {
+    		query := `select ` + userRows + ` from ` + m.table + ` where id = ? limit 1`
+    		return conn.QueryRow(v, query, primary)
+    	})
+    	switch err {
+    	case nil:
+    		return &resp, nil
+    	case sqlc.ErrNotFound:
+    		return nil, ErrNotFound
+    	default:
+    		return nil, err
+    	}
+    }
+
+    func (m *UserModel) FindOneByMobile(mobile string) (*User, error) {
+    	userMobileKey := fmt.Sprintf("%s%v", cacheUserMobilePrefix, mobile)
+    	var resp User
+    	err := m.QueryRowIndex(&resp, userMobileKey, func(primary interface{}) string {
+    		return fmt.Sprintf("%s%v", cacheUserIdPrefix, primary)
+    	}, func(conn sqlx.SqlConn, v interface{}) (i interface{}, e error) {
+    		query := `select ` + userRows + ` from ` + m.table + ` where mobile = ? limit 1`
+    		if err := conn.QueryRow(&resp, query, mobile); err != nil {
+    			return nil, err
+    		}
+    		return resp.Id, nil
+    	}, func(conn sqlx.SqlConn, v, primary interface{}) error {
+    		query := `select ` + userRows + ` from ` + m.table + ` where id = ? limit 1`
+    		return conn.QueryRow(v, query, primary)
+    	})
+    	switch err {
+    	case nil:
+    		return &resp, nil
+    	case sqlc.ErrNotFound:
+    		return nil, ErrNotFound
+    	default:
+    		return nil, err
+    	}
+    }
+
+    func (m *UserModel) Update(data User) error {
+    	userIdKey := fmt.Sprintf("%s%v", cacheUserIdPrefix, data.Id)
+    	_, err := m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) {
+    		query := `update ` + m.table + ` set ` + userRowsWithPlaceHolder + ` where id = ?`
+    		return conn.Exec(query, data.Name, data.Password, data.Mobile, data.Gender, data.Nickname, data.Id)
+    	}, userIdKey)
+    	return err
+    }
+
+    func (m *UserModel) Delete(id int64) error {
+    	data, err := m.FindOne(id)
+    	if err != nil {
+    		return err
+    	}
+    	userIdKey := fmt.Sprintf("%s%v", cacheUserIdPrefix, id)
+    	userNameKey := fmt.Sprintf("%s%v", cacheUserNamePrefix, data.Name)
+    	userMobileKey := fmt.Sprintf("%s%v", cacheUserMobilePrefix, data.Mobile)
+    	_, err = m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) {
+    		query := `delete from ` + m.table + ` where id = ?`
+    		return conn.Exec(query, id)
+    	}, userIdKey, userNameKey, userMobileKey)
+    	return err
+    }
+  ```
+
+### 用法
+
+```Plain Text
+goctl model mysql -h
+```
+
+```Plain Text
+NAME:
+   goctl model mysql - generate mysql model"
+
+USAGE:
+   goctl model mysql command [command options] [arguments...]
+
+COMMANDS:
+   ddl         generate mysql model from ddl"
+   datasource  generate model from datasource"
+
+OPTIONS:
+   --help, -h  show help
+```
+
+## 生成规则
+
+* 默认规则
+  
+  我们默认用户在建表时会创建createTime、updateTime字段(忽略大小写、下划线命名风格)且默认值均为`CURRENT_TIMESTAMP`，而updateTime支持`ON UPDATE CURRENT_TIMESTAMP`，对于这两个字段生成`insert`、`update`时会被移除，不在赋值范畴内，当然，如果你不需要这两个字段那也无大碍。
+* 带缓存模式
+  * ddl
+
+	```shell script
+	goctl model mysql -src={filename} -dir={dir} -cache=true
+	```
+
+  * datasource
+
+	```shell script
+	goctl model mysql datasource -url={datasource} -table={tables}  -dir={dir} -cache=true
+	```
+
+  目前仅支持redis缓存，如果选择带缓存模式，即生成的`FindOne(ByXxx)`&`Delete`代码会生成带缓存逻辑的代码，目前仅支持单索引字段（除全文索引外），对于联合索引我们默认认为不需要带缓存，且不属于通用型代码，因此没有放在代码生成行列，如example中user表中的`id`、`name`、`mobile`字段均属于单字段索引。
+
+* 不带缓存模式
+  
+  * ddl
+  
+      ```shell script
+      goctl model -src={filename} -dir={dir}
+      ```
+
+  * datasource
+  
+      ```shell script
+          goctl model mysql datasource -url={datasource} -table={tables}  -dir={dir}
+      ```
+
+  or
+  * ddl
+
+      ```shell script
+        goctl model -src={filename} -dir={dir} -cache=false
+      ```
+
+  * datasource
+  
+      ```shell script
+        goctl model mysql datasource -url={datasource} -table={tables}  -dir={dir} -cache=false
+      ```
+  
+  生成代码仅基本的CURD结构。
+
+## 缓存
+
+  对于缓存这一块我选择用一问一答的形式进行罗列。我想这样能够更清晰的描述model中缓存的功能。
+
+* 缓存会缓存哪些信息？
+
+  对于主键字段缓存，会缓存整个结构体信息，而对于单索引字段（除全文索引）则缓存主键字段值。
+
+* 数据有更新（`update`）操作会清空缓存吗？
+  
+  会，但仅清空主键缓存的信息，why？这里就不做详细赘述了。
+
+* 为什么不按照单索引字段生成`updateByXxx`和`deleteByXxx`的代码？
+  
+  理论上是没任何问题，但是我们认为，对于model层的数据操作均是以整个结构体为单位，包括查询，我不建议只查询某部分字段（不反对），否则我们的缓存就没有意义了。
+
+* 为什么不支持`findPageLimit`、`findAll`这么模式代码生层？
+  
+  目前，我认为除了基本的CURD外，其他的代码均属于<i>业务型</i>代码，这个我觉得开发人员根据业务需要进行编写更好。
+
+## QA
+
+* goctl model除了命令行模式，支持插件模式吗？
+
+  很快支持idea插件。

doc/goctl-rpc.md

@@ -0,0 +1,238 @@
+# Rpc Generation
+
+Goctl Rpc是`goctl`脚手架下的一个rpc服务代码生成模块，支持proto模板生成和rpc服务代码生成，通过此工具生成代码你只需要关注业务逻辑编写而不用去编写一些重复性的代码。这使得我们把精力重心放在业务上，从而加快了开发效率且降低了代码出错率。
+
+## 特性
+
+* 简单易用
+* 快速提升开发效率
+* 出错率低
+
+## 快速开始
+
+### 方式一：快速生成greet服务
+
+  通过命令 `goctl rpc new ${servieName}`生成
+
+  如生成greet rpc服务：
+
+  ```shell script
+  goctl rpc new greet
+  ```
+
+  执行后代码结构如下:
+
+  ```golang
+  └── greet
+    ├── etc
+    │   └── greet.yaml
+    ├── go.mod
+    ├── go.sum
+    ├── greet
+    │   ├── greet.go
+    │   ├── greet_mock.go
+    │   └── types.go
+    ├── greet.go
+    ├── greet.proto
+    ├── internal
+    │   ├── config
+    │   │   └── config.go
+    │   ├── logic
+    │   │   └── pinglogic.go
+    │   ├── server
+    │   │   └── greetserver.go
+    │   └── svc
+    │       └── servicecontext.go
+    └── pb
+        └── greet.pb.go
+  ```
+
+rpc一键生成常见问题解决见 <a href="#常见问题解决">常见问题解决</a>
+
+### 方式二：通过指定proto生成rpc服务
+
+* 生成proto模板
+
+  ```shell script
+  goctl rpc template -o=user.proto
+  ```
+
+  ```golang
+  syntax = "proto3";
+
+  package remote;
+
+  message Request {
+    // 用户名
+    string username = 1;
+    // 用户密码
+    string password = 2;
+  }
+
+  message Response {
+    // 用户名称
+    string name = 1;
+    // 用户性别
+    string gender = 2;
+  }
+
+  service User {
+    // 登录
+    rpc Login(Request)returns(Response);
+  }
+  ```
+
+* 生成rpc服务代码
+
+  ```shell script
+  goctl rpc proto -src=user.proto
+  ```
+
+  代码tree
+
+  ```Plain Text
+  user
+      ├── etc
+      │   └── user.json
+      ├── internal
+      │   ├── config
+      │   │   └── config.go
+      │   ├── handler
+      │   │   ├── loginhandler.go
+      │   ├── logic
+      │   │   └── loginlogic.go
+      │   └── svc
+      │       └── servicecontext.go
+      ├── pb
+      │   └── user.pb.go
+      ├── shared
+      │   ├── mockusermodel.go
+      │   ├── types.go
+      │   └── usermodel.go
+      ├── user.go
+      └── user.proto
+
+  ```
+
+## 准备工作
+
+* 安装了go环境
+* 安装了protoc&protoc-gen-go，并且已经设置环境变量
+* mockgen(可选,将移除)
+* 更多问题请见 <a href="#注意事项">注意事项</a>
+
+## 用法
+
+### rpc服务生成用法
+
+```shell script
+goctl rpc proto -h
+```
+
+```shell script
+NAME:
+   goctl rpc proto - generate rpc from proto
+
+USAGE:
+   goctl rpc proto [command options] [arguments...]
+
+OPTIONS:
+   --src value, -s value         the file path of the proto source file
+   --dir value, -d value         the target path of the code,default path is "${pwd}". [option]
+   --service value, --srv value  the name of rpc service. [option]
+   --shared[已废弃] value                the dir of the shared file,default path is "${pwd}/shared. [option]"
+   --idea                        whether the command execution environment is from idea plugin. [option]
+
+```
+
+### 参数说明
+
+* --src 必填，proto数据源，目前暂时支持单个proto文件生成，这里不支持（不建议）外部依赖
+* --dir 非必填，默认为proto文件所在目录，生成代码的目标目录
+* --service 服务名称，非必填，默认为proto文件所在目录名称，但是，如果proto所在目录为一下结构：
+
+    ```shell script
+    user
+        ├── cmd
+        │   └── rpc
+        │       └── user.proto
+    ```
+
+    则服务名称亦为user，而非proto所在文件夹名称了，这里推荐使用这种结构，可以方便在同一个服务名下建立不同类型的服务(api、rpc、mq等)，便于代码管理与维护。
+* --shared[⚠️已废弃] 非必填，默认为$dir(xxx.proto)/shared，rpc client逻辑代码存放目录。
+  
+  > 注意：这里的shared文件夹名称将会是代码中的package名称。
+
+* --idea 非必填，是否为idea插件中执行，保留字段，终端执行可以忽略
+
+## 开发人员需要做什么
+
+关注业务代码编写，将重复性、与业务无关的工作交给goctl，生成好rpc服务代码后，开饭人员仅需要修改
+
+* 服务中的配置文件编写(etc/xx.json、internal/config/config.go)
+* 服务中业务逻辑编写(internal/logic/xxlogic.go)
+* 服务中资源上下文的编写(internal/svc/servicecontext.go)
+
+## 扩展
+
+对于需要进行rpc mock的开发人员，在安装了`mockgen`工具的前提下可以在rpc的shared文件中生成好对应的mock文件。
+
+## 注意事项
+
+* `google.golang.org/grpc`需要降级到v1.26.0,且protoc-gen-go版本不能高于v1.3.2（see [https://github.com/grpc/grpc-go/issues/3347](https://github.com/grpc/grpc-go/issues/3347)）即
+
+  ```shell script
+  replace google.golang.org/grpc => google.golang.org/grpc v1.26.0
+  ```
+
+* proto不支持暂多文件同时生成
+* proto不支持外部依赖包引入，message不支持inline
+* 目前main文件、shared文件、handler文件会被强制覆盖，而和开发人员手动需要编写的则不会覆盖生成，这一类在代码头部均有
+
+    ```shell script
+    // Code generated by goctl. DO NOT EDIT!
+    // Source: xxx.proto
+    ```
+  
+  的标识，请注意不要将也写业务性代码写在里面。
+
+## 常见问题解决(go mod工程)
+
+* 错误一:
+
+  ```golang
+  pb/xx.pb.go:220:7: undefined: grpc.ClientConnInterface
+  pb/xx.pb.go:224:11: undefined: grpc.SupportPackageIsVersion6
+  pb/xx.pb.go:234:5: undefined: grpc.ClientConnInterface
+  pb/xx.pb.go:237:24: undefined: grpc.ClientConnInterface
+  ```
+
+  解决方法：请将`protoc-gen-go`版本降至v1.3.2及一下
+
+* 错误二:
+
+  ```golang
+
+  # go.etcd.io/etcd/clientv3/balancer/picker
+  ../../../go/pkg/mod/go.etcd.io/etcd@v0.0.0-20200402134248-51bdeb39e698/clientv3/balancer/picker/err.go:25:9: cannot use &errPicker literal (type *errPicker) as type Picker in return argument:*errPicker does not implement Picker (wrong type for Pick method)
+    have Pick(context.Context, balancer.PickInfo) (balancer.SubConn, func(balancer.DoneInfo), error)
+    want Pick(balancer.PickInfo) (balancer.PickResult, error)
+    ../../../go/pkg/mod/go.etcd.io/etcd@v0.0.0-20200402134248-51bdeb39e698/clientv3/balancer/picker/roundrobin_balanced.go:33:9: cannot use &rrBalanced literal (type *rrBalanced) as type Picker in return argument:
+    *rrBalanced does not implement Picker (wrong type for Pick method)
+		have Pick(context.Context, balancer.PickInfo) (balancer.SubConn, func(balancer.DoneInfo), error)
+    want Pick(balancer.PickInfo) (balancer.PickResult, error)
+    #github.com/tal-tech/go-zero/zrpc/internal/balancer/p2c
+    ../../../go/pkg/mod/github.com/tal-tech/go-zero@v1.0.12/zrpc/internal/balancer/p2c/p2c.go:41:32: not enough arguments in call to base.NewBalancerBuilder
+	have (string, *p2cPickerBuilder)
+  want (string, base.PickerBuilder, base.Config)
+  ../../../go/pkg/mod/github.com/tal-tech/go-zero@v1.0.12/zrpc/internal/balancer/p2c/p2c.go:58:9: cannot use &p2cPicker literal (type *p2cPicker) as type balancer.Picker in return argument:
+	*p2cPicker does not implement balancer.Picker (wrong type for Pick method)
+		have Pick(context.Context, balancer.PickInfo) (balancer.SubConn, func(balancer.DoneInfo), error)
+		want Pick(balancer.PickInfo) (balancer.PickResult, error)
+  ```
+
+  解决方法：
+  
+    ```golang
+    replace google.golang.org/grpc => google.golang.org/grpc v1.26.0
+    ```

doc/goctl.md

@@ -1,33 +1,40 @@
-# goctl使用说明
+# goctl使用
 
 ## goctl用途
+
 * 定义api请求
 * 根据定义的api自动生成golang(后端), java(iOS & Android), typescript(web & 晓程序)，dart(flutter)
 * 生成MySQL CURD+Cache
-*  生成MongoDB CURD+Cache
+* 生成MongoDB CURD+Cache
 
 ## goctl使用说明
+
+### 快速生成服务
+
+* api: goctl api new xxxx
+* rpc: goctl rpc new xxxx
+
 #### goctl参数说明
 
   `goctl api [go/java/ts] [-api user/user.api] [-dir ./src]`
 
   > api 后面接生成的语言，现支持go/java/typescript
-
+  >
   > -api 自定义api所在路径
-
+  >
   > -dir 自定义生成目录
 
 #### 保持goctl总是最新版
 
   第一次运行会在~/.goctl里增加下面两行：
 
-  ```
+  ```Plain Text
   url = http://47.97.184.41:7777/
   ```
 
 #### API 语法说明
 
-```
+``` golang
 info(
     title: doc title
     desc: >
@@ -123,7 +130,9 @@ service user-api {
     )
     head /api/ping()
 }
+
 ```
+
 1. info部分：描述了api基本信息，比如Auth，api是哪个用途。
 2. type部分：type类型声明和golang语法兼容。
 3. service部分：service代表一组服务，一个服务可以由多组名称相同的service组成，可以针对每一组service配置jwt和auth认证，另外通过folder属性可以指定service生成所在子目录。
@@ -132,6 +141,7 @@ service user-api {
    请求getRequest里面的属性赋值，getResponse为返回的结构体，这两个类型都定义在2描述的类型中。
 
 #### api vscode插件
+
 开发者可以在vscode中搜索goctl的api插件，它提供了api语法高亮，语法检测和格式化相关功能。
 
  1. 支持语法高亮和类型导航。
@@ -143,7 +153,7 @@ service user-api {
   命令如下：  
   `goctl api go -api user/user.api -dir user`
 
-  ```
+  ```Plain Text
 
 	.
     ├── internal
@@ -173,17 +183,20 @@ service user-api {
     └── user.go
 
   ```
+
   生成的代码可以直接跑，有几个地方需要改：
 
-  * 在`servicecontext.go`里面增加需要传递给logic的一些资源，比如mysql, redis，rpc等
-  * 在定义的get/post/put/delete等请求的handler和logic里增加处理业务逻辑的代码
+* 在`servicecontext.go`里面增加需要传递给logic的一些资源，比如mysql, redis，rpc等
+* 在定义的get/post/put/delete等请求的handler和logic里增加处理业务逻辑的代码
 
 #### 根据定义好的api文件生成java代码
+
 ```shell
 goctl api java -api user/user.api -dir ./src
 ```
 
 #### 根据定义好的api文件生成typescript代码
+
 ```shell
 goctl api ts -api user/user.api -dir ./src -webapi ***
 
@@ -191,6 +204,7 @@ ts需要指定webapi所在目录
 ```
 
 #### 根据定义好的api文件生成Dart代码
+
 ```shell
 goctl api dart -api user/user.api -dir ./src
 ```
@@ -198,32 +212,37 @@ goctl api dart -api user/user.api -dir ./src
 ## 根据mysql ddl或者datasource生成model文件
 
 ```shell script
-$ goctl model mysql -src={filename} -dir={dir} -cache={true|false}
+goctl model mysql -src={filename} -dir={dir} -cache={true|false}
 ```
+
 详情参考[model文档](https://github.com/tal-tech/go-zero/blob/master/tools/goctl/model/sql/README.MD)
 
 ## 根据定义好的简单go文件生成mongo代码文件(仅限golang使用)  
+
 ```shell
 goctl model mongo -src {{yourDir}}/xiao/service/xhb/user/model/usermodel.go -cache yes
-
--src需要提供简单的usermodel.go文件，里面只需要提供一个结构体即可
--cache 控制是否需要缓存 yes=需要 no=不需要
-src 示例代码如下
 ```
+
+* src需要提供简单的usermodel.go文件，里面只需要提供一个结构体即可
+* cache 控制是否需要缓存 yes=需要 no=不需要
+
+src 示例代码如下
+
   ```go
-package model
-    
-type User struct {
-	Name string `o:"find,get,set" c:"姓名"`
-	Age int `o:"find,get,set" c:"年纪"`
-	School string `c:"学校"`
-}
+    package model
+
+    type User struct {
+      Name string `o:"find,get,set" c:"姓名"`
+      Age int `o:"find,get,set" c:"年纪"`
+      School string `c:"学校"`
+    }
   ```
-     结构体中不需要提供Id,CreateTime,UpdateTime三个字段，会自动生成   
-     结构体中每个tag有两个可选标签 c 和 o  
-     c是改字段的注释  
-     o是改字段需要生产的操作函数 可以取得get,find,set 分别表示生成返回单个对象的查询方法，返回多个对象的查询方法，设置该字段方法  
-     生成的目标文件会覆盖该简单go文件  
+
+结构体中不需要提供Id,CreateTime,UpdateTime三个字段，会自动生成
+结构体中每个tag有两个可选标签 c 和 o  
+c 是改字段的注释  
+o 是改字段需要生产的操作函数 可以取得get,find,set 分别表示生成返回单个对象的查询方法，返回多个对象的查询方法，设置该字段方法  
+生成的目标文件会覆盖该简单go文件  
 
 ## goctl rpc生成（业务剥离中，暂未开放）
 
@@ -232,15 +251,15 @@ type User struct {
 
   参数说明：
 
-  - ${proto}: proto文件
-  - ${serviceName}: rpc服务名称
-  - ${projectName}: 所属项目，如xjy,xhb,crm,hera，具体查看help，主要为了根据不同项目服务往redis注册key，可选
-  - ${directory}: 输出目录
-  - ${shared}: shared文件生成目录，可选，默认为${pwd}/shared
+* ${proto}: proto文件
+* ${serviceName}: rpc服务名称
+* ${projectName}: 所属项目，如xjy,xhb,crm,hera，具体查看help，主要为了根据不同项目服务往redis注册key，可选
+* ${directory}: 输出目录
+* ${shared}: shared文件生成目录，可选，默认为${pwd}/shared
 
-  生成目录结构示例：
+生成目录结构示例：
 
-  ``` go
+  ```Plain Text
 	.
     ├── shared [示例目录，可自己指定，强制覆盖更新]
     │   └── contentservicemodel.go
@@ -276,4 +295,5 @@ type User struct {
     │   └── test.go [强制覆盖更新]
     └── test.proto
   ```
-  - 注意 ：目前rpc目录生成的proto文件暂不支持import外部proto文件   
+
+注意 ：目前rpc目录生成的proto文件暂不支持import外部proto文件

doc/keywords.md

@@ -22,7 +22,8 @@ fmt.Println(replacer.Replace("日本的首都是东京"))
 ```
 
 可以得到：
-```
+
+```Plain Text
 东京是日本的首都
 ```
 
@@ -46,7 +47,7 @@ fmt.Println(keywords)
 
 可以得到：
 
-```
+```Plain Text
 [苍井空 日本AV女优 AV演员色情 AV AV演员]
 ```
 
@@ -70,7 +71,7 @@ fmt.Println(found)
 
 可以得到：
 
-```
+```Plain Text
 日本????兼电视、电影演员。?????女优是xx出道, ??????们最精彩的表演是??????表演
 [苍井空 日本AV女优 AV演员色情 AV AV演员]
 true
@@ -83,4 +84,3 @@ true
 | Sentences | Keywords | Regex    | go-zero |
 | --------- | -------- | -------- | ------- |
 | 10000     | 10000    | 16min10s | 27.2ms  |
-

doc/loadshedding.md

@@ -1,23 +1,26 @@
 # 服务自适应降载保护设计
 
 ## 设计目的
+
 * 保证系统不被过量请求拖垮
 * 在保证系统稳定的前提下，尽可能提供更高的吞吐量
 
 ## 设计考虑因素
+
 * 如何衡量系统负载
-	* 是否处于虚机或容器内，需要读取cgroup相关负载
-	* 用1000m表示100%CPU，推荐使用800m表示系统高负载
+  * 是否处于虚机或容器内，需要读取cgroup相关负载
+  * 用1000m表示100%CPU，推荐使用800m表示系统高负载
 * 尽可能小的Overhead，不显著增加RT
 * 不考虑服务本身所依赖的DB或者缓存系统问题，这类问题通过熔断机制来解决
 
 ## 机制设计
+
 * 计算CPU负载时使用滑动平均来降低CPU负载抖动带来的不稳定，关于滑动平均见参考资料
-	* 滑动平均就是取之前连续N次值的近似平均，N取值可以通过超参beta来决定
-	* 当CPU负载大于指定值时触发降载保护机制
+  * 滑动平均就是取之前连续N次值的近似平均，N取值可以通过超参beta来决定
+  * 当CPU负载大于指定值时触发降载保护机制
 * 时间窗口机制，用滑动窗口机制来记录之前时间窗口内的QPS和RT(response time)
-	* 滑动窗口使用5秒钟50个桶的方式，每个桶保存100ms时间内的请求，循环利用，最新的覆盖最老的
-	* 计算maxQPS和minRT时需要过滤掉最新的时间没有用完的桶，防止此桶内只有极少数请求，并且RT处于低概率的极小值，所以计算maxQPS和minRT时按照上面的50个桶的参数只会算49个
+  * 滑动窗口使用5秒钟50个桶的方式，每个桶保存100ms时间内的请求，循环利用，最新的覆盖最老的
+  * 计算maxQPS和minRT时需要过滤掉最新的时间没有用完的桶，防止此桶内只有极少数请求，并且RT处于低概率的极小值，所以计算maxQPS和minRT时按照上面的50个桶的参数只会算49个
 * 满足以下所有条件则拒绝该请求
 	1. 当前CPU负载超过预设阈值，或者上次拒绝时间到现在不超过1秒(冷却期)。冷却期是为了不能让负载刚下来就马上增加压力导致立马又上去的来回抖动
 	2. `averageFlying > max(1, QPS*minRT/1e3)`
@@ -27,7 +30,7 @@
 			1. 请求增加后更新一次averageFlying，见图中橙色曲线
 			2. 请求结束后更新一次averageFlying，见图中绿色曲线
 			3. 请求增加后更新一次averageFlying，请求结束后更新一次averageFlying
-			
+
 			我们使用的是第二种，这样可以更好的防止抖动，如图：
 			![flying策略对比](images/shedding_flying.jpg)
 		* QPS = maxPass * bucketsPerSecond
@@ -36,11 +39,13 @@
 		* 1e3表示1000毫秒，minRT单位也是毫秒，QPS*minRT/1e3得到的就是平均每个时间点有多少并发请求
 
 ## 降载的使用
+
 * 已经在ngin和rpcx框架里增加了可选激活配置
-	* CpuThreshold，如果把值设置为大于0的值，则激活该服务的自动降载机制
-* 如果请求被drop，那么错误日志里会有`dropreq`关键字	
+  * CpuThreshold，如果把值设置为大于0的值，则激活该服务的自动降载机制
+* 如果请求被drop，那么错误日志里会有`dropreq`关键字
 
 ## 参考资料
+
 * [滑动平均](https://www.cnblogs.com/wuliytTaotao/p/9479958.html)
 * [Sentinel自适应限流](https://github.com/alibaba/Sentinel/wiki/%E7%B3%BB%E7%BB%9F%E8%87%AA%E9%80%82%E5%BA%94%E9%99%90%E6%B5%81)
-* [Kratos自适应限流保护](https://github.com/bilibili/kratos/blob/master/doc/wiki-cn/ratelimit.md)
+* [Kratos自适应限流保护](https://github.com/bilibili/kratos/blob/master/doc/wiki-cn/ratelimit.md)

doc/mapping.md

@@ -0,0 +1,131 @@
+# 文本序列化和反序列化
+
+go-zero针对文本的序列化和反序列化主要在三个地方使用
+
+* http api请求体的反序列化
+* http api返回体的序列化
+* 配置文件的反序列化
+
+本文假定读者已经定义过api文件以及修改过配置文件，如不熟悉，可参照
+
+* [快速构建高并发微服务](shorturl.md)
+* [快速构建高并发微服务](bookstore.md)
+
+## 1. http api请求体的反序列化
+
+在反序列化的过程中的针对请求数据的`数据格式`以及`数据校验`需求，go-zero实现了自己的一套反序列化机制
+
+### 1.1 `数据格式`以订单order.api文件为例
+
+```go
+type (
+	createOrderReq struct {
+		token     string `path:"token"`     // 用户token
+		productId string `json:"productId"` // 商品ID
+		num       int    `json:"num"`       // 商品数量
+	}
+	createOrderRes struct {
+		success bool `json:"success"` // 是否成功
+	}
+	findOrderReq struct {
+		token    string `path:"token"`    // 用户token
+		page     int    `form:"page"`     // 页数
+		pageSize int8   `form:"pageSize"` // 页大小
+	}
+	findOrderRes struct {
+		orderInfo []orderInfo `json:"orderInfo"` // 商品ID
+	}
+	orderInfo struct {
+		productId   string `json:"productId"`   // 商品ID
+		productName string `json:"productName"` // 商品名称
+		num         int    `json:"num"`         // 商品数量
+	}
+	deleteOrderReq struct {
+		id string `path:"id"`
+	}
+	deleteOrderRes struct {
+		success bool `json:"success"` // 是否成功
+	}
+)
+
+service order {
+    @doc(
+        summary: 创建订单
+    )
+    @server(
+        handler: CreateOrderHandler
+    )
+    post /order/add/:token(createOrderReq) returns(createOrderRes)
+
+    @doc(
+        summary: 获取订单
+    )
+    @server(
+        handler: FindOrderHandler
+    )
+    get /order/find/:token(findOrderReq) returns(findOrderRes)
+
+    @doc(
+        summary: 删除订单
+    )
+    @server(
+        handler: DeleteOrderHandler
+    )
+    delete /order/:id(deleteOrderReq) returns(deleteOrderRes)
+}
+```
+
+http api请求体的反序列化的tag有三种：
+
+* `path`：http url 路径中参数反序列化
+  * `/order/add/1234567`会解析出来token为1234567
+* `form`：http  form表单反序列化，需要 header头添加  Content-Type: multipart/form-data
+  * `/order/find/1234567?page=1&pageSize=20`会解析出来token为1234567，page为1，pageSize为20
+
+* `json`：http request json body反序列化，需要 header头添加  Content-Type: application/json
+  * `{"productId":"321","num":1}`会解析出来productId为321，num为1
+
+### 1.2 `数据校验`以用户user.api文件为例
+
+```go
+type (
+	createUserReq struct {
+		age    int8   `json:"age,default=20,range=(12:100]"` // 年龄
+		name   string `json:"name"`                          // 名字
+		alias  string `json:"alias,optional"`                // 别名
+		sex    string `json:"sex,options=male|female"`       // 性别
+		avatar string `json:"avatar,default=default.png"`    // 头像
+	}
+	createUserRes struct {
+		success bool `json:"success"` // 是否成功
+	}
+)
+
+service user {
+    @doc(
+        summary: 创建订单
+    )
+    @server(
+        handler: CreateUserHandler
+    )
+    post /user/add(createUserReq) returns(createUserRes)
+}
+```
+
+数据校验有很多种方式，包括以下但不限：
+
+* `age`：默认不输入为20，输入则取值范围为(12:100]，前开后闭
+* `name`：必填，不可为空
+* `alias`：选填，可为空
+* `sex`：必填，取值为`male`或`female`
+* `avatar`：选填，默认为`default.png`
+
+更多详情参见[unmarshaler_test.go](../core/mapping/unmarshaler_test.go)
+
+## 2. http api返回体的序列化
+
+* 使用官方默认的`encoding/json`包序列化，在此不再累赘
+
+## 3. 配置文件的反序列化
+
+* `配置文件的反序列化`和`http api请求体的反序列化`使用同一套解析规则，可参照`http api请求体的反序列化`

doc/mapreduce.md

@@ -1,29 +1,190 @@
-# mapreduce用法
+# 通过MapReduce降低服务响应时间
 
-## Map
+在微服务中开发中，api网关扮演对外提供restful api的角色，而api的数据往往会依赖其他服务，复杂的api更是会依赖多个甚至数十个服务。虽然单个被依赖服务的耗时一般都比较低，但如果多个服务串行依赖的话那么整个api的耗时将会大大增加。
 
-> channel是Map的返回值
+那么通过什么手段来优化呢？我们首先想到的是通过并发来的方式来处理依赖，这样就能降低整个依赖的耗时，Go基础库中为我们提供了 [WaitGroup](https://golang.org/pkg/sync/#WaitGroup) 工具用来进行并发控制，但实际业务场景中多个依赖如果有一个出错我们期望能立即返回而不是等所有依赖都执行完再返回结果，而且WaitGroup中对变量的赋值往往需要加锁，每个依赖函数都需要添加Add和Done对于新手来说比较容易出错
 
-由于Map是个并发操作，如果不用range或drain的方式，那么在使用返回值的时候，可能Map里面的代码还在读写这个返回值，可能导致数据不全或者`concurrent read write错误`
+基于以上的背景，go-zero框架中为我们提供了并发处理工具[MapReduce](https://github.com/tal-tech/go-zero/blob/master/core/mr/mapreduce.go)，该工具开箱即用，不需要做什么初始化，我们通过下图看下使用MapReduce和没使用的耗时对比:
 
-* 如果需要收集Map生成的结果，那么使用如下方式
+![依赖耗时对比](./images/mr_time.png)
 
-	```
-	for v := range channel {
-		// v is with type interface{}
+相同的依赖，串行处理的话需要200ms，使用MapReduce后的耗时等于所有依赖中最大的耗时为100ms，可见MapReduce可以大大降低服务耗时，而且随着依赖的增加效果就会越明显，减少处理耗时的同时并不会增加服务器压力
+
+## 并发处理工具[MapReduce](https://github.com/tal-tech/go-zero/tree/master/core/mr)
+
+[MapReduce](https://zh.wikipedia.org/wiki/MapReduce)是Google提出的一个软件架构，用于大规模数据集的并行运算，go-zero中的MapReduce工具正是借鉴了这种架构思想  
+
+go-zero框架中的MapReduce工具主要用来对批量数据进行并发的处理，以此来提升服务的性能  
+
+![mapreduce原理图](./images/mr.png)
+
+我们通过几个示例来演示MapReduce的用法  
+
+MapReduce主要有三个参数，第一个参数为generate用以生产数据，第二个参数为mapper用以对数据进行处理，第三个参数为reducer用以对mapper后的数据做聚合返回，还可以通过opts选项设置并发处理的线程数量  
+
+场景一: 某些功能的结果往往需要依赖多个服务，比如商品详情的结果往往会依赖用户服务、库存服务、订单服务等等，一般被依赖的服务都是以rpc的形式对外提供，为了降低依赖的耗时我们往往需要对依赖做并行处理  
+
+```go
+func productDetail(uid, pid int64) (*ProductDetail, error) {
+	var pd ProductDetail
+	err := mr.Finish(func() (err error) {
+		pd.User, err = userRpc.User(uid)
+		return
+	}, func() (err error) {
+		pd.Store, err = storeRpc.Store(pid)
+		return
+	}, func() (err error) {
+		pd.Order, err = orderRpc.Order(pid)
+		return
+	})
+
+	if err != nil {
+		log.Printf("product detail error: %v", err)
+		return nil, err
 	}
-	```
 
-* 如果不需要收集结果，那么就需要显式的调用mapreduce.Drain，如
+	return &pd, nil
+}
+```
 
-	```
-	mapreduce.Drain(channel)
-	```
-	
-## MapReduce
+该示例中返回商品详情依赖了多个服务获取数据，因此做并发的依赖处理，对接口的性能有很大的提升  
 
-* mapper和reducer方法里可以调用cancel，调用了cancel之后返回值会是`nil, false`
-* mapper里面如果有item不写入writer，那么这个item就不会被reduce收集
-* mapper里面如果有处理item时panic，那么这个item也不会被reduce收集
-* reduce是单线程，所有mapper出来的结果在这里串行处理
-* reduce里面不写writer，或者panic，会导致返回`nil, false`
+场景二: 很多时候我们需要对一批数据进行处理，比如对一批用户id，效验每个用户的合法性并且效验过程中有一个出错就认为效验失败，返回的结果为效验合法的用户id  
+
+```go
+func checkLegal(uids []int64) ([]int64, error) {
+	r, err := mr.MapReduce(func(source chan<- interface{}) {
+		for _, uid := range uids {
+			source <- uid
+		}
+	}, func(item interface{}, writer mr.Writer, cancel func(error)) {
+		uid := item.(int64)
+		ok, err := check(uid)
+		if err != nil {
+			cancel(err)
+		}
+		if ok {
+			writer.Write(uid)
+		}
+	}, func(pipe <-chan interface{}, writer mr.Writer, cancel func(error)) {
+		var uids []int64
+		for p := range pipe {
+			uids = append(uids, p.(int64))
+		}
+		writer.Write(uids)
+	})
+	if err != nil {
+        log.Printf("check error: %v", err)
+		return nil, err
+	}
+
+	return r.([]int64), nil
+}
+
+func check(uid int64) (bool, error) {
+	// do something check user legal
+	return true, nil
+}
+```
+
+该示例中，如果check过程出现错误则通过cancel方法结束效验过程，并返回error整个效验过程结束，如果某个uid效验结果为false则最终结果不返回该uid
+
+***MapReduce使用注意事项***
+
+* mapper和reducer中都可以调用cancel，参数为error，调用后立即返回，返回结果为nil, error
+* mapper中如果不调用writer.Write则item最终不会被reducer聚合
+* reducer中如果不调用writer.Wirte则返回结果为nil, ErrReduceNoOutput
+* reducer为单线程，所有mapper出来的结果在这里串行聚合
+
+***实现原理分析:***
+
+MapReduce中首先通过buildSource方法通过执行generate(参数为无缓冲channel)产生数据，并返回无缓冲的channel，mapper会从该channel中读取数据
+
+```go
+func buildSource(generate GenerateFunc) chan interface{} {
+    source := make(chan interface{})
+    go func() {
+        defer close(source)
+        generate(source)
+    }()
+
+    return source
+}
+```
+
+在MapReduceWithSource方法中定义了cancel方法，mapper和reducer中都可以调用该方法，调用后主线程收到close信号会立马返回  
+
+```go
+cancel := once(func(err error) {
+    if err != nil {
+        retErr.Set(err)
+    } else {
+        // 默认的error
+        retErr.Set(ErrCancelWithNil)
+    }
+
+    drain(source)
+    // 调用close(ouput)主线程收到Done信号，立马返回
+    finish()
+})
+```
+
+在mapperDispatcher方法中调用了executeMappers，executeMappers消费buildSource产生的数据，每一个item都会起一个goroutine单独处理，默认最大并发数为16，可以通过WithWorkers进行设置  
+
+```go
+var wg sync.WaitGroup
+defer func() {
+    wg.Wait() // 保证所有的item都处理完成
+    close(collector)
+}()
+
+pool := make(chan lang.PlaceholderType, workers)
+writer := newGuardedWriter(collector, done) // 将mapper处理完的数据写入collector
+for {
+    select {
+    case <-done: // 当调用了cancel会触发立即返回
+        return
+    case pool <- lang.Placeholder: // 控制最大并发数
+        item, ok := <-input
+        if !ok {
+            <-pool
+            return
+        }
+
+        wg.Add(1)
+        go func() {
+            defer func() {
+                wg.Done()
+                <-pool
+            }()
+
+            mapper(item, writer) // 对item进行处理，处理完调用writer.Write把结果写入collector对应的channel中
+        }()
+    }
+}
+```
+
+reducer单goroutine对数mapper写入collector的数据进行处理，如果reducer中没有手动调用writer.Write则最终会执行finish方法对output进行close避免死锁
+
+```go
+go func() {
+    defer func() {
+        if r := recover(); r != nil {
+            cancel(fmt.Errorf("%v", r))
+        } else {
+            finish()
+        }
+    }()
+    reducer(collector, writer, cancel)
+}()
+```
+
+在该工具包中还提供了许多针对不同业务场景的方法，实现原理与MapReduce大同小异，感兴趣的同学可以查看源码学习
+
+* MapReduceVoid 功能和MapReduce类似但没有结果返回只返回error
+* Finish 处理固定数量的依赖，返回error，有一个error立即返回
+* FinishVoid 和Finish方法功能类似，没有返回值
+* Map 只做generate和mapper处理，返回channel
+* MapVoid 和Map功能类似，无返回
+
+本文主要介绍了go-zero框架中的MapReduce工具，在实际的项目中非常实用。用好工具对于提升服务性能和开发效率都有很大的帮助，希望本篇文章能给大家带来一些收获。

doc/metric.md

@@ -0,0 +1,112 @@
+# 基于prometheus的微服务指标监控
+
+服务上线后我们往往需要对服务进行监控，以便能及早发现问题并做针对性的优化，监控又可分为多种形式，比如日志监控，调用链监控，指标监控等等。而通过指标监控能清晰的观察出服务指标的变化趋势，了解服务的运行状态，对于保证服务稳定起着非常重要的作用
+
+[prometheus](https://prometheus.io/)是一个开源的系统监控和告警工具，支持强大的查询语言PromQL允许用户实时选择和汇聚时间序列数据，时间序列数据是服务端通过HTTP协议主动拉取获得，也可以通过中间网关来推送时间序列数据，可以通过静态配置文件或服务发现来获取监控目标
+
+## Prometheus 的架构
+
+Prometheus 的整体架构以及生态系统组件如下图所示：
+
+![prometheus](./images/prometheus.png)
+
+Prometheus Server直接从监控目标中或者间接通过推送网关来拉取监控指标，它在本地存储所有抓取到样本数据，并对此数据执行一系列规则，以汇总和记录现有数据的新时间序列或生成告警。可以通过 [Grafana](https://grafana.com/) 或者其他工具来实现监控数据的可视化
+
+## go-zero基于prometheus的服务指标监控
+
+[go-zero](https://github.com/tal-tech/go-zero) 框架中集成了基于prometheus的服务指标监控，下面我们通过go-zero官方的示例[shorturl](https://github.com/tal-tech/go-zero/blob/master/doc/shorturl.md)来演示是如何对服务指标进行收集监控的：
+
+- 第一步需要先安装Prometheus，安装步骤请参考[官方文档](https://prometheus.io/)
+- go-zero默认不开启prometheus监控，开启方式很简单，只需要在shorturl-api.yaml文件中增加配置如下，其中Host为Prometheus Server地址为必填配置，Port端口不填默认9091，Path为用来拉取指标的路径默认为/metrics
+
+```go
+Prometheus:
+  Host: 127.0.0.1
+  Port: 9091
+  Path: /metrics
+```
+
+- 编辑prometheus的配置文件prometheus.yml，添加如下配置，并创建targets.json
+
+```go
+- job_name: 'file_ds'
+    file_sd_configs:
+    - files:
+      - targets.json
+```
+
+- 编辑targets.json文件，其中targets为shorturl配置的目标地址，并添加了几个默认的标签
+
+```go
+[
+    {
+        "targets": ["127.0.0.1:9091"],
+        "labels": {
+            "job": "shorturl-api",
+            "app": "shorturl-api",
+            "env": "test",
+            "instance": "127.0.0.1:8888"
+        }
+    }
+]
+```
+
+- 启动prometheus服务，默认侦听在9090端口
+
+```go
+prometheus --config.file=prometheus.yml
+```
+
+- 在浏览器输入http://127.0.0.1:9090/，然后点击Status -> Targets即可看到状态为Up的Job，并且Lables栏可以看到我们配置的默认的标签
+
+![job状态为up](./images/prom_up.png)
+
+通过以上几个步骤我们完成了prometheus对shorturl服务的指标监控收集的配置工作，为了演示简单我们进行了手动的配置，在实际的生产环境中一般采用定时更新配置文件或者服务发现的方式来配置监控目标，篇幅有限这里不展开讲解，感兴趣的同学请自行查看相关文档
+
+## go-zero监控的指标类型
+
+go-zero中目前在http的中间件和rpc的拦截器中添加了对请求指标的监控。
+
+主要从请求耗时和请求错误两个维度，请求耗时采用了Histogram指标类型定义了多个Buckets方便进行分位统计，请求错误采用了Counter类型，并在http metric中添加了path标签rpc metric中添加了method标签以便进行细分监控。
+
+接下来演示如何查看监控指标：
+
+首先在命令行多次执行如下命令
+
+```go
+curl -i "http://localhost:8888/shorten?url=http://www.xiaoheiban.cn"
+```
+
+打开Prometheus切换到Graph界面，在输入框中输入{path="/shorten"}指令，即可查看监控指标，如下图
+
+![查询面板](./images/panel.png)
+
+我们通过PromQL语法查询过滤path为/shorten的指标，结果中显示了指标名以及指标数值，其中http_server_requests_code_total指标中code值为http的状态码，200表明请求成功，http_server_requests_duration_ms_bucket中对不同bucket结果分别进行了统计，还可以看到所有的指标中都添加了我们配置的默认指标
+
+Console界面主要展示了查询的指标结果，Graph界面为我们提供了简单的图形化的展示界面，在实际的生产环境中我们一般使用Grafana做图形化的展示
+
+## grafana可视化界面
+
+[grafana](https://grafana.com/)是一款可视化工具，功能强大，支持多种数据来源Prometheus、Elasticsearch、Graphite等，安装比较简单请参考[官方文档](https://grafana.com/docs/grafana/latest/)，grafana默认端口3000，安装好后再浏览器输入http://localhost:3000/，默认账号和密码都为admin
+
+下面演示如何基于以上指标进行可视化界面的绘制：
+
+- 点击左侧边栏Configuration->Data Source->Add data source进行数据源添加，其中HTTP的URL为数据源的地址
+
+![datasource](./images/datasource.png)
+
+- 点击左侧边栏添加dashboard，然后添加Variables方便针对不同的标签进行过滤筛选比如添加app变量用来过滤不同的服务
+
+![variables](./images/variables.png)
+
+- 进入dashboard点击右上角Add panel添加面板，以path维度统计接口的qps
+
+![qps](./images/qps.png)
+
+- 最终的效果如下所示，可以通过服务名称过滤不同的服务，面板展示了path为/shorten的qps变化趋势
+
+![qps panel](./images/qps_panel.png)
+
+## 总结
+
+以上演示了go-zero中基于prometheus+grafana服务指标监控的简单流程，生产环境中可以根据实际的场景做不同维度的监控分析。现在go-zero的监控指标主要还是针对http和rpc，这对于服务的整体监控显然还是不足的，比如容器资源的监控，依赖的mysql、redis等资源的监控，以及自定义的指标监控等等，go-zero在这方面后续还会持续优化。希望这篇文章能够给您带来帮助

doc/periodicalexecutor.md

@@ -1,6 +1,6 @@
 # PeriodicalExecutor设计
 
-# 添加任务
+## 添加任务
 
 * 当前没有未执行的任务
   * 添加并启动定时器
@@ -9,7 +9,7 @@
     * 如到，执行所有缓存任务
     * 未到，只添加
 
-# 定时器到期
+## 定时器到期
 
 * 清除并执行所有缓存任务
-* 再等待N个定时周期，如果等待过程中一直没有新任务，则退出
+* 再等待N个定时周期，如果等待过程中一直没有新任务，则退出

doc/sharedcalls.md

@@ -0,0 +1,167 @@
+# 防止缓存击穿之进程内共享调用
+
+go-zero微服务框架中提供了许多开箱即用的工具，好的工具不仅能提升服务的性能而且还能提升代码的鲁棒性避免出错，实现代码风格的统一方便他人阅读等等。
+
+本文主要讲述进程内共享调用神器[SharedCalls](https://github.com/tal-tech/go-zero/blob/master/core/syncx/sharedcalls.go)。  
+
+## 使用场景
+
+并发场景下，可能会有多个线程（协程）同时请求同一份资源，如果每个请求都要走一遍资源的请求过程，除了比较低效之外，还会对资源服务造成并发的压力。举一个具体例子，比如缓存失效，多个请求同时到达某服务请求某资源，该资源在缓存中已经失效，此时这些请求会继续访问DB做查询，会引起数据库压力瞬间增大。而使用SharedCalls可以使得同时多个请求只需要发起一次拿结果的调用，其他请求"坐享其成"，这种设计有效减少了资源服务的并发压力，可以有效防止缓存击穿。
+
+高并发场景下，当某个热点key缓存失效后，多个请求会同时从数据库加载该资源，并保存到缓存，如果不做防范，可能会导致数据库被直接打死。针对这种场景，go-zero框架中已经提供了实现，具体可参看[sqlc](https://github.com/tal-tech/go-zero/blob/master/core/stores/sqlc/cachedsql.go)和[mongoc](https://github.com/tal-tech/go-zero/blob/master/core/stores/mongoc/cachedcollection.go)等实现代码。
+
+为了简化演示代码，我们通过多个线程同时去获取一个id来模拟缓存的场景。如下：
+
+```go
+func main() {
+  const round = 5
+  var wg sync.WaitGroup
+  barrier := syncx.NewSharedCalls()
+
+  wg.Add(round)
+  for i := 0; i < round; i++ {
+    // 多个线程同时执行
+    go func() {
+      defer wg.Done()
+      // 可以看到，多个线程在同一个key上去请求资源，获取资源的实际函数只会被调用一次
+      val, err := barrier.Do("once", func() (interface{}, error) {
+        // sleep 1秒，为了让多个线程同时取once这个key上的数据
+        time.Sleep(time.Second)
+        // 生成了一个随机的id
+        return stringx.RandId(), nil
+      })
+      if err != nil {
+        fmt.Println(err)
+      } else {
+        fmt.Println(val)
+      }
+    }()
+  }
+
+  wg.Wait()
+}
+```
+
+运行，打印结果为：
+
+```
+837c577b1008a0db
+837c577b1008a0db
+837c577b1008a0db
+837c577b1008a0db
+837c577b1008a0db
+```
+
+可以看出，只要是同一个key上的同时发起的请求，都会共享同一个结果，对获取DB数据进缓存等场景特别有用，可以有效防止缓存击穿。
+
+## 关键源码分析
+
+- SharedCalls interface提供了Do和DoEx两种方法的抽象
+
+  ```go
+  // SharedCalls接口提供了Do和DoEx两种方法
+  type SharedCalls interface {
+    Do(key string, fn func() (interface{}, error)) (interface{}, error)
+    DoEx(key string, fn func() (interface{}, error)) (interface{}, bool, error)
+  }
+  ```
+
+- SharedCalls interface的具体实现sharedGroup
+
+  ```go
+  // call代表对指定资源的一次请求
+  type call struct {
+    wg  sync.WaitGroup  // 用于协调各个请求goroutine之间的资源共享
+    val interface{}     // 用于保存请求的返回值
+    err error           // 用于保存请求过程中发生的错误
+  }
+  
+  type sharedGroup struct {
+    calls map[string]*call
+    lock  sync.Mutex
+  }
+  ```
+
+- sharedGroup的Do方法
+
+  - key参数：可以理解为资源的唯一标识。
+  - fn参数：真正获取资源的方法。
+  - 处理过程分析：
+
+  ```go
+  // 当多个请求同时使用Do方法请求资源时
+  func (g *sharedGroup) Do(key string, fn func() (interface{}, error)) (interface{}, error) {
+    // 先申请加锁
+    g.lock.Lock()
+  
+    // 根据key，获取对应的call结果,并用变量c保存
+    if c, ok := g.calls[key]; ok {
+      // 拿到call以后，释放锁，此处call可能还没有实际数据，只是一个空的内存占位
+      g.lock.Unlock()
+      // 调用wg.Wait，判断是否有其他goroutine正在申请资源，如果阻塞，说明有其他goroutine正在获取资源
+      c.wg.Wait()
+      // 当wg.Wait不再阻塞，表示资源获取已经结束，可以直接返回结果
+      return c.val, c.err
+    }
+
+    // 没有拿到结果，则调用makeCall方法去获取资源，注意此处仍然是锁住的，可以保证只有一个goroutine可以调用makecall
+    c := g.makeCall(key, fn)
+  // 返回调用结果
+    return c.val, c.err
+  }
+```
+  
+- sharedGroup的DoEx方法
+
+  - 和Do方法类似，只是返回值中增加了布尔值表示值是调用makeCall方法直接获取的，还是取的共享成果
+
+  ```go
+  func (g *sharedGroup) DoEx(key string, fn func() (interface{}, error)) (val interface{}, fresh bool, err error) {
+    g.lock.Lock()
+    if c, ok := g.calls[key]; ok {
+      g.lock.Unlock()
+      c.wg.Wait()
+      return c.val, false, c.err
+    }
+
+    c := g.makeCall(key, fn)
+    return c.val, true, c.err
+  }
+  ```
+
+- sharedGroup的makeCall方法
+
+  - 该方法由Do和DoEx方法调用，是真正发起资源请求的方法。
+  
+  ```go
+  // 进入makeCall的一定只有一个goroutine，因为要拿锁锁住的
+  func (g *sharedGroup) makeCall(key string, fn func() (interface{}, error)) *call {
+    // 创建call结构，用于保存本次请求的结果
+    c := new(call)
+    // wg加1，用于通知其他请求资源的goroutine等待本次资源获取的结束
+    c.wg.Add(1)
+    // 将用于保存结果的call放入map中，以供其他goroutine获取
+    g.calls[key] = c
+    // 释放锁，这样其他请求的goroutine才能获取call的内存占位
+    g.lock.Unlock()
+  
+    defer func() {
+      // delete key first, done later. can't reverse the order, because if reverse,
+      // another Do call might wg.Wait() without get notified with wg.Done()
+      g.lock.Lock()
+      delete(g.calls, key)
+      g.lock.Unlock()
+
+      // 调用wg.Done，通知其他goroutine可以返回结果，这样本批次所有请求完成结果的共享
+      c.wg.Done()
+    }()
+  
+    // 调用fn方法，将结果填入变量c中
+    c.val, c.err = fn()
+    return c
+  }
+```
+
+## 最后
+
+本文主要介绍了go-zero框架中的 SharedCalls工具，对其应用场景和关键代码做了简单的梳理，希望本篇文章能给大家带来一些收获。

doc/shorturl-en.md

@@ -0,0 +1,535 @@
+# Rapid development of microservices
+
+English | [简体中文](shorturl.md)
+
+## 0. Why building microservices are so difficult
+
+To build a well working microservice, we need lots of knowledges from different aspects.
+
+* basic functionalities
+  1. concurrency control and rate limit, to avoid being brought down by unexpected inbound
+  2. service discovery, make sure new or terminated nodes are detected asap
+  3. load balancing, balance the traffic base on the throughput of nodes
+  4. timeout control, avoid the nodes continue to process the timed out requests
+  5. circuit breaker, load shedding, fail fast, protects the failure nodes to recover asap
+
+* advanced functionalities
+  1. authorization, make sure users can only access their own data
+  2. tracing, to understand the whole system and locate the specific problem quickly
+  3. logging, collects data and helps to backtrace problems
+  4. observability, no metrics, no optimization
+
+For any point listed above, we need a long article to describe the theory and the implementation. But for us, the developers, it’s very difficult to understand all the concepts and make it happen in our systems. Although, we can use the frameworks that have been well served busy sites. [go-zero](https://github.com/tal-tech/go-zero) is born for this purpose, especially for cloud-native microservice systems.
+
+As well, we always adhere to the idea that **prefer tools over conventions and documents**. We hope to reduce the boilerplate code as much as possible, and let developers focus on developing the business related code. For this purpose, we developed the tool  `goctl`.
+
+Let’s take the shorturl microservice as a quick example to demonstrate how to quickly create microservices by using [go-zero](https://github.com/tal-tech/go-zero). After finishing this tutorial, you’ll find that it’s so easy to write microservices!
+
+## 1. What is a shorturl service
+
+A shorturl service is that it converts a long url into a short one, by well designed algorithms.
+
+Writting this shorturl service is to demonstrate the complete flow of creating a microservice by using go-zero. But algorithms and detail implementations are quite simplified, and this shorturl service is not suitable for production use.
+
+## 2. Architecture of shorturl microservice
+
+<img src="images/shorturl-arch.png" alt="Architecture" width="800" />
+
+* In this tutorial, I only use one rpc service, transform, to demonstrate. It’s not telling that one API Gateway only can call one RPC service, it’s only for simplicity here.
+* In production, we should try best to isolate the data belongs to services, that means each service should only use its own database.
+
+## 3. goctl generated code overview
+
+All modules with green background are generated, and will be enabled when necessary. The modules with red background are handwritten code, which is typically business logic code.
+
+* API Gateway
+
+  <img src="images/api-gen.png" alt="api" width="800" />
+
+* RPC
+
+  <img src="images/rpc-gen.png" alt="rpc" width="800" />
+
+* model
+
+  <img src="images/model-gen.png" alt="model" width="800" />
+
+And now, let’s walk through the complete flow of quickly create a microservice with go-zero.
+
+## 4. Get started
+
+* install etcd, mysql, redis
+
+* install goctl
+
+  ```shell
+  GO111MODULE=on go get -u github.com/tal-tech/go-zero/tools/goctl
+  ```
+
+* create the working dir `shorturl`
+
+* in `shorturl` dir, execute `go mod init shorturl` to initialize `go.mod`
+
+## 5. Write code for API Gateway
+
+* use goctl to generate `api/shorturl.api`
+
+  ```shell
+  goctl api -o bookstore.api
+  ```
+
+  for simplicity, the leading `info` block is removed, and the code looks like:
+
+  ```go
+  type (
+  	expandReq struct {
+  		shorten string `form:"shorten"`
+  	}
+  
+  	expandResp struct {
+  		url string `json:"url"`
+  	}
+  )
+  
+  type (
+  	shortenReq struct {
+  		url string `form:"url"`
+  	}
+  
+  	shortenResp struct {
+  		shorten string `json:"shorten"`
+  	}
+  )
+  
+  service shorturl-api {
+  	@server(
+  		handler: ShortenHandler
+  	)
+  	get /shorten(shortenReq) returns(shortenResp)
+  
+  	@server(
+  		handler: ExpandHandler
+  	)
+  	get /expand(expandReq) returns(expandResp)
+  }
+  ```
+
+  the usage of `type` keyword is the same as that in go, service is used to define get/post/head/delete api requests, described below:
+
+  * `service shorturl-api {` defines the service name
+  * `@server` defines the properties that used in server side
+  * `handler` defines the handler name
+  * `get /shorten(shortenReq) returns(shortenResp)` defines this is a GET request, the request parameters, and the response parameters
+
+* generate the code for API Gateway by using goctl
+
+  ```shell
+  goctl api go -api shorturl.api -dir .
+  ```
+
+  the generated file structure looks like:
+
+  ```Plain Text
+  .
+  ├── api
+  │   ├── etc
+  │   │   └── shorturl-api.yaml         // configuration file
+  │   ├── internal
+  │   │   ├── config
+  │   │   │   └── config.go             // configuration definition
+  │   │   ├── handler
+  │   │   │   ├── expandhandler.go      // implements expandHandler
+  │   │   │   ├── routes.go             // routes definition
+  │   │   │   └── shortenhandler.go     // implements shortenHandler
+  │   │   ├── logic
+  │   │   │   ├── expandlogic.go        // implements ExpandLogic
+  │   │   │   └── shortenlogic.go       // implements ShortenLogic
+  │   │   ├── svc
+  │   │   │   └── servicecontext.go     // defines ServiceContext
+  │   │   └── types
+  │   │       └── types.go              // defines request/response
+  │   ├── shorturl.api
+  │   └── shorturl.go                   // main entrance
+  ├── go.mod
+  └── go.sum
+  ```
+
+* start API Gateway service, listens on port 8888 by default
+
+  ```shell
+  go run shorturl.go -f etc/shorturl-api.yaml
+  ```
+
+* test API Gateway service
+
+  ```shell
+  curl -i "http://localhost:8888/shorten?url=http://www.xiaoheiban.cn"
+  ```
+
+  response like:
+
+  ```http
+  HTTP/1.1 200 OK
+  Content-Type: application/json
+  Date: Thu, 27 Aug 2020 14:31:39 GMT
+  Content-Length: 15
+  
+  {"shortUrl":""}
+  ```
+
+  You can see that the API Gateway service did nothing except returned a zero value. And let’s implement the business logic in rpc service.
+
+* you can modify `internal/svc/servicecontext.go` to pass dependencies if needed
+
+* implement logic in package `internal/logic`
+
+* you can use goctl to generate code for clients base on the .api file
+
+* till now, the client engineer can work with the api, don’t need to wait for the implementation of server side
+
+## 6. Write code for transform rpc service
+
+* under directory `rpc/transform` create `transform.proto` file
+
+  ```shell
+  goctl rpc template -o transform.proto
+  ```
+  
+  edit the file and make the code looks like:
+
+  ```protobuf
+  syntax = "proto3";
+  
+  package transform;
+  
+  message expandReq {
+      string shorten = 1;
+  }
+  
+  message expandResp {
+      string url = 1;
+  }
+  
+  message shortenReq {
+      string url = 1;
+  }
+  
+  message shortenResp {
+      string shorten = 1;
+  }
+  
+  service transformer {
+      rpc expand(expandReq) returns(expandResp);
+      rpc shorten(shortenReq) returns(shortenResp);
+  }
+  ```
+  
+* use goctl to generate the rpc code, execute the following command in `rpc/transofrm`
+
+  ```shell
+  goctl rpc proto -src transform.proto
+  ```
+
+  the generated file structure looks like:
+
+  ```Plain Text
+  rpc/transform
+  ├── etc
+  │   └── transform.yaml              // configuration file
+  ├── internal
+  │   ├── config
+  │   │   └── config.go               // configuration definition
+  │   ├── logic
+  │   │   ├── expandlogic.go          // implements expand logic
+  │   │   └── shortenlogic.go         // implements shorten logic
+  │   ├── server
+  │   │   └── transformerserver.go    // rpc handler
+  │   └── svc
+  │       └── servicecontext.go       // defines service context, like dependencies
+  ├── pb
+  │   └── transform.pb.go
+  ├── transform.go                    // rpc main entrance
+  ├── transform.proto
+  └── transformer
+      ├── transformer.go              // defines how rpc clients call this service
+      ├── transformer_mock.go         // mock file, for test purpose
+      └── types.go                    // request/response definition
+  ```
+
+  just run it, looks like:
+
+  ```shell
+  $ go run transform.go -f etc/transform.yaml
+  Starting rpc server at 127.0.0.1:8080...
+  ```
+
+  you can change the listening port in file `etc/transform.yaml`.
+
+## 7. Modify API Gateway to call transform rpc service
+
+* modify the configuration file `shorturl-api.yaml`, add the following:
+
+  ```yaml
+  Transform:
+    Etcd:
+      Hosts:
+        - localhost:2379
+      Key: transform.rpc
+  ```
+
+  automatically discover the transform service by using etcd.
+
+* modify the file `internal/config/config.go`, add dependency on transform service:
+
+  ```go
+  type Config struct {
+  	rest.RestConf
+  	Transform zrpc.RpcClientConf     // manual code
+  }
+  ```
+
+* modify the file `internal/svc/servicecontext.go`, like below:
+
+  ```go
+  type ServiceContext struct {
+  	Config    config.Config
+  	Transformer transformer.Transformer  // manual code
+  }
+  
+  func NewServiceContext(c config.Config) *ServiceContext {
+  	return &ServiceContext{
+  		Config:    c,
+      Transformer: transformer.NewTransformer(zrpc.MustNewClient(c.Transform)), // manual code
+  	}
+  }
+  ```
+
+  passing the dependencies among services within ServiceContext.
+
+* modify the method `Expand` in the file `internal/logic/expandlogic.go`, looks like:
+
+  ```go
+  func (l *ExpandLogic) Expand(req types.ExpandReq) (*types.ExpandResp, error) {
+    // manual code start
+  	resp, err := l.svcCtx.Transformer.Expand(l.ctx, &transformer.ExpandReq{
+  		Shorten: req.Shorten,
+  	})
+  	if err != nil {
+  		return nil, err
+  	}
+  
+  	return &types.ExpandResp{
+  		Url: resp.Url,
+  	}, nil
+    // manual code stop
+  }
+  ```
+  
+  by calling the method `Expand` of `transformer` to restore the shortened url.
+  
+* modify the file `internal/logic/shortenlogic.go`, looks like:
+
+  ```go
+  func (l *ShortenLogic) Shorten(req types.ShortenReq) (*types.ShortenResp, error) {
+    // manual code start
+  	resp, err := l.svcCtx.Transformer.Shorten(l.ctx, &transformer.ShortenReq{
+  		Url: req.Url,
+  	})
+  	if err != nil {
+  		return nil, err
+  	}
+  
+  	return &types.ShortenResp{
+  		Shorten: resp.Shorten,
+  	}, nil
+    // manual code stop
+  }
+  ```
+
+  by calling the method `Shorten` of `transformer` to shorten the url.
+
+Till now, we’ve done the modification of API Gateway. All the manually added code are marked.
+
+## 8. Define the database schema, generate the code for CRUD+cache
+
+* under shorturl, create the directory `rpc/transform/model`: `mkdir -p rpc/transform/model`
+
+* under the directory rpc/transform/model create the file called shorturl.sql`, contents as below:
+
+  ```sql
+  CREATE TABLE `shorturl`
+  (
+    `shorten` varchar(255) NOT NULL COMMENT 'shorten key',
+    `url` varchar(255) NOT NULL COMMENT 'original url',
+    PRIMARY KEY(`shorten`)
+  ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+  ```
+
+* create DB and table
+
+  ```sql
+  create database gozero;
+  ```
+
+  ```sql
+  source shorturl.sql;
+  ```
+
+* under the directory `rpc/transform/model` execute the following command to genrate CRUD+cache code, `-c` means using `redis cache`
+
+  ```shell
+  goctl model mysql ddl -c -src shorturl.sql -dir .
+  ```
+
+  you can also generate the code from the database url by using `datasource` subcommand instead of `ddl`
+
+  the generated file structure looks like:
+
+  ```Plain Text
+  rpc/transform/model
+  ├── shorturl.sql
+  ├── shorturlmodel.go              // CRUD+cache code
+  └── vars.go                       // const and var definition
+  ```
+
+## 9. Modify shorten/expand rpc to call crud+cache
+
+* modify `rpc/transform/etc/transform.yaml`, add the following:
+
+  ```yaml
+  DataSource: root:@tcp(localhost:3306)/gozero
+  Table: shorturl
+  Cache:
+    - Host: localhost:6379
+  ```
+
+  you can use multiple redis as cache. redis node and cluster are both supported.
+
+* modify `rpc/transform/internal/config.go`, like below:
+
+  ```go
+  type Config struct {
+  	zrpc.RpcServerConf
+  	DataSource string             // manual code
+  	Table      string             // manual code
+  	Cache      cache.CacheConf    // manual code
+  }
+  ```
+
+  added the configuration for mysql and redis cache.
+
+* modify `rpc/transform/internal/svc/servicecontext.go`, like below:
+
+  ```go
+  type ServiceContext struct {
+  	c     config.Config
+    Model *model.ShorturlModel   // manual code
+  }
+  
+  func NewServiceContext(c config.Config) *ServiceContext {
+  	return &ServiceContext{
+  		c:             c,
+  		Model: model.NewShorturlModel(sqlx.NewMysql(c.DataSource), c.Cache, c.Table), // manual code
+  	}
+  }
+  ```
+
+* modify `rpc/transform/internal/logic/expandlogic.go`, like below:
+
+  ```go
+  func (l *ExpandLogic) Expand(in *transform.ExpandReq) (*transform.ExpandResp, error) {
+  	// manual code start
+  	res, err := l.svcCtx.Model.FindOne(in.Shorten)
+  	if err != nil {
+  		return nil, err
+  	}
+  
+  	return &transform.ExpandResp{
+  		Url: res.Url,
+  	}, nil
+  	// manual code stop
+  }
+  ```
+
+* modify `rpc/shorten/internal/logic/shortenlogic.go`, looks like:
+
+  ```go
+  func (l *ShortenLogic) Shorten(in *transform.ShortenReq) (*transform.ShortenResp, error) {
+    // manual code start, generates shorturl
+  	key := hash.Md5Hex([]byte(in.Url))[:6]
+  	_, err := l.svcCtx.Model.Insert(model.Shorturl{
+  		Shorten: key,
+  		Url:     in.Url,
+  	})
+  	if err != nil {
+  		return nil, err
+  	}
+  
+  	return &transform.ShortenResp{
+  		Shorten: key,
+  	}, nil
+    // manual code stop
+  }
+  ```
+
+  till now, we finished modifing the code, all the modified code is marked.
+
+## 10. Call shorten and expand services
+
+* call shorten api
+
+  ```shell
+  curl -i "http://localhost:8888/shorten?url=http://www.xiaoheiban.cn"
+  ```
+
+  response like:
+
+  ```http
+  HTTP/1.1 200 OK
+  Content-Type: application/json
+  Date: Sat, 29 Aug 2020 10:49:49 GMT
+  Content-Length: 21
+  
+  {"shorten":"f35b2a"}
+  ```
+
+* call expand api
+
+  ```shell
+  curl -i "http://localhost:8888/expand?shorten=f35b2a"
+  ```
+
+  response like:
+
+  ```http
+  HTTP/1.1 200 OK
+  Content-Type: application/json
+  Date: Sat, 29 Aug 2020 10:51:53 GMT
+  Content-Length: 34
+  
+  {"url":"http://www.xiaoheiban.cn"}
+  ```
+
+## 11. Benchmark
+
+Because benchmarking the write requests depends on the write throughput of mysql, we only benchmarked the expand api. We read the data from mysql and cache it in redis. I chose 100 hot keys hardcoded in shorten.lua to generate the benchmark.
+
+![Benchmark](images/shorturl-benchmark.png)
+
+as shown above, in my MacBook Pro, the QPS is like 30K+.
+
+## 12. Full code
+
+[https://github.com/tal-tech/go-zero/tree/master/example/shorturl](https://github.com/tal-tech/go-zero/tree/master/example/shorturl)
+
+## 13. Conclusion
+
+We always adhere to **prefer tools over conventions and documents**.
+
+go-zero is not only a framework, but also a tool to simplify and standardize the building of micoservice systems.
+
+We not only keep the framework simple, but also encapsulate the complexity into the framework. And the developers are free from building the difficult and boilerplate code. Then we get the rapid development and less failure.
+
+For the generated code by goctl, lots of microservice components are included, like concurrency control, adaptive circuit breaker, adaptive load shedding, auto cache control etc. And it’s easy to deal with the busy sites.
+
+If you have any ideas that can help us to improve the productivity, tell me any time! 👏

doc/shorturl.md

@@ -1,6 +1,8 @@
 # 快速构建高并发微服务
 
-## 0. 为什么说做好微服务很难？
+[English](shorturl-en.md) | 简体中文
+
+## 0. 为什么说做好微服务很难
 
 要想做好微服务，我们需要理解和掌握的知识点非常多，从几个维度上来说：
 
@@ -23,7 +25,7 @@
 
 下面我通过短链微服务来演示通过[go-zero](https://github.com/tal-tech/go-zero)快速的创建微服务的流程，走完一遍，你就会发现：原来编写微服务如此简单！
 
-## 1. 什么是短链服务？
+## 1. 什么是短链服务
 
 短链服务就是将长的URL网址，通过程序计算等方式，转换为简短的网址字符串。
 
@@ -61,7 +63,7 @@
 * 安装goctl工具
 
   ```shell
-  GO111MODULE=on GOPROXY=https://goproxy.cn/,direct go get github.com/tal-tech/go-zero/tools/goctl
+  GO111MODULE=on GOPROXY=https://goproxy.cn/,direct go get -u github.com/tal-tech/go-zero/tools/goctl
   ```
 
 * 创建工作目录`shorturl`
@@ -121,7 +123,7 @@
 
   生成的文件结构如下：
 
-  ```
+  ```Plain Text
   .
   ├── api
   │   ├── etc
@@ -226,7 +228,7 @@
 
   文件结构如下：
 
-  ```
+  ```Plain Text
   rpc/transform
   ├── etc
   │   └── transform.yaml              // 配置文件
@@ -278,7 +280,7 @@
   ```go
   type Config struct {
   	rest.RestConf
-  	Transform rpcx.RpcClientConf     // 手动代码
+  	Transform zrpc.RpcClientConf     // 手动代码
   }
   ```
 
@@ -287,13 +289,13 @@
   ```go
   type ServiceContext struct {
   	Config    config.Config
-  	Transformer rpcx.Client                               // 手动代码
+  	Transformer transformer.Transformer                                          // 手动代码
   }
   
   func NewServiceContext(c config.Config) *ServiceContext {
   	return &ServiceContext{
   		Config:    c,
-  		Transformer: rpcx.MustNewClient(c.Transform),  // 手动代码
+      Transformer: transformer.NewTransformer(zrpc.MustNewClient(c.Transform)),  // 手动代码
   	}
   }
   ```
@@ -305,8 +307,7 @@
   ```go
   func (l *ExpandLogic) Expand(req types.ExpandReq) (*types.ExpandResp, error) {
     // 手动代码开始
-    trans := transformer.NewTransformer(l.svcCtx.Transformer)
-  	resp, err := trans.Expand(l.ctx, &transformer.ExpandReq{
+  	resp, err := l.svcCtx.Transformer.Expand(l.ctx, &transformer.ExpandReq{
   		Shorten: req.Shorten,
   	})
   	if err != nil {
@@ -320,15 +321,14 @@
   }
   ```
 
-  通过调用`transformer`的`Expand`方法实现短链恢复到url
+通过调用`transformer`的`Expand`方法实现短链恢复到url
 
 * 修改`internal/logic/shortenlogic.go`，如下：
 
   ```go
   func (l *ShortenLogic) Shorten(req types.ShortenReq) (*types.ShortenResp, error) {
     // 手动代码开始
-  	trans := transformer.NewTransformer(l.svcCtx.Transformer)
-  	resp, err := trans.Shorten(l.ctx, &transformer.ShortenReq{
+  	resp, err := l.svcCtx.Transformer.Shorten(l.ctx, &transformer.ShortenReq{
   		Url: req.Url,
   	})
   	if err != nil {
@@ -342,9 +342,9 @@
   }
   ```
 
-  通过调用`transformer`的`Shorten`方法实现url到短链的变换
+通过调用`transformer`的`Shorten`方法实现url到短链的变换
 
-  至此，API Gateway修改完成，虽然贴的代码多，但是期中修改的是很少的一部分，为了方便理解上下文，我贴了完整代码，接下来处理CRUD+cache
+至此，API Gateway修改完成，虽然贴的代码多，但是期中修改的是很少的一部分，为了方便理解上下文，我贴了完整代码，接下来处理CRUD+cache
 
 ## 8. 定义数据库表结构，并生成CRUD+cache代码
 
@@ -381,7 +381,7 @@
 
   生成后的文件结构如下：
 
-  ```
+  ```Plain Text
   rpc/transform/model
   ├── shorturl.sql
   ├── shorturlmodel.go              // CRUD+cache代码
@@ -405,7 +405,7 @@
 
   ```go
   type Config struct {
-  	rpcx.RpcServerConf
+  	zrpc.RpcServerConf
   	DataSource string             // 手动代码
   	Table      string             // 手动代码
   	Cache      cache.CacheConf    // 手动代码
@@ -433,7 +433,7 @@
 * 修改`rpc/transform/internal/logic/expandlogic.go`，如下：
 
   ```go
-  func (l *ExpandLogic) Expand(in *expand.ExpandReq) (*expand.ExpandResp, error) {
+  func (l *ExpandLogic) Expand(in *transform.ExpandReq) (*transform.ExpandResp, error) {
   	// 手动代码开始
   	res, err := l.svcCtx.Model.FindOne(in.Shorten)
   	if err != nil {
@@ -450,7 +450,7 @@
 * 修改`rpc/shorten/internal/logic/shortenlogic.go`，如下：
 
   ```go
-  func (l *ShortenLogic) Shorten(in *shorten.ShortenReq) (*shorten.ShortenResp, error) {
+  func (l *ShortenLogic) Shorten(in *transform.ShortenReq) (*transform.ShortenResp, error) {
     // 手动代码开始，生成短链接
   	key := hash.Md5Hex([]byte(in.Url))[:6]
   	_, err := l.svcCtx.Model.Insert(model.Shorturl{
@@ -514,6 +514,10 @@
 
 可以看出在我的MacBook Pro上能达到3万+的qps。
 
+## 12. 完整代码
+
+[https://github.com/tal-tech/go-zero/tree/master/example/shorturl](https://github.com/tal-tech/go-zero/tree/master/example/shorturl)
+
 ## 12. 总结
 
 我们一直强调**工具大于约定和文档**。
@@ -525,4 +529,3 @@ go-zero不只是一个框架，更是一个建立在框架+工具基础上的，
 通过go-zero+goctl生成的代码，包含了微服务治理的各种组件，包括：并发控制、自适应熔断、自适应降载、自动缓存控制等，可以轻松部署以承载巨大访问量。
 
 有任何好的提升工程效率的想法，随时欢迎交流！👏
-

doc/sql-cache.md

@@ -21,4 +21,3 @@
     * 通过Primary到DB查询行记录，并写入缓存
   * 有Primary到行记录的缓存
     * 直接返回缓存结果
-

example/bookstore/api/bookstore.api

@@ -0,0 +1,33 @@
+type (
+	addReq struct {
+		book  string `form:"book"`
+		price int64  `form:"price"`
+	}
+
+	addResp struct {
+		ok bool `json:"ok"`
+	}
+)
+
+type (
+	checkReq struct {
+		book string `form:"book"`
+	}
+
+	checkResp struct {
+		found bool  `json:"found"`
+		price int64 `json:"price"`
+	}
+)
+
+service bookstore-api {
+    @server(
+        handler: AddHandler
+    )
+    get /add(addReq) returns(addResp)
+
+    @server(
+        handler: CheckHandler
+    )
+    get /check(checkReq) returns(checkResp)
+}

example/bookstore/api/bookstore.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+
+	"bookstore/api/internal/config"
+	"bookstore/api/internal/handler"
+	"bookstore/api/internal/svc"
+
+	"github.com/tal-tech/go-zero/core/conf"
+	"github.com/tal-tech/go-zero/rest"
+)
+
+var configFile = flag.String("f", "etc/bookstore-api.yaml", "the config file")
+
+func main() {
+	flag.Parse()
+
+	var c config.Config
+	conf.MustLoad(*configFile, &c)
+
+	ctx := svc.NewServiceContext(c)
+	server := rest.MustNewServer(c.RestConf)
+	defer server.Stop()
+
+	handler.RegisterHandlers(server, ctx)
+
+	fmt.Printf("Starting server at %s:%d...\n", c.Host, c.Port)
+	server.Start()
+}

example/bookstore/api/etc/bookstore-api.yaml

@@ -0,0 +1,13 @@
+Name: bookstore-api
+Host: 0.0.0.0
+Port: 8888
+Add:
+  Etcd:
+    Hosts:
+      - localhost:2379
+    Key: add.rpc
+Check:
+  Etcd:
+    Hosts:
+      - localhost:2379
+    Key: check.rpc

example/bookstore/api/internal/config/config.go

@@ -0,0 +1,12 @@
+package config
+
+import (
+	"github.com/tal-tech/go-zero/rest"
+	"github.com/tal-tech/go-zero/zrpc"
+)
+
+type Config struct {
+	rest.RestConf
+	Add   zrpc.RpcClientConf
+	Check zrpc.RpcClientConf
+}

example/bookstore/api/internal/handler/addhandler.go

@@ -0,0 +1,28 @@
+package handler
+
+import (
+	"bookstore/api/internal/logic"
+	"bookstore/api/internal/svc"
+	"bookstore/api/internal/types"
+	"net/http"
+
+	"github.com/tal-tech/go-zero/rest/httpx"
+)
+
+func addHandler(ctx *svc.ServiceContext) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var req types.AddReq
+		if err := httpx.Parse(r, &req); err != nil {
+			httpx.Error(w, err)
+			return
+		}
+
+		l := logic.NewAddLogic(r.Context(), ctx)
+		resp, err := l.Add(req)
+		if err != nil {
+			httpx.Error(w, err)
+		} else {
+			httpx.WriteJson(w, http.StatusOK, resp)
+		}
+	}
+}

example/bookstore/api/internal/handler/checkhandler.go

@@ -0,0 +1,28 @@
+package handler
+
+import (
+	"bookstore/api/internal/logic"
+	"bookstore/api/internal/svc"
+	"bookstore/api/internal/types"
+	"net/http"
+
+	"github.com/tal-tech/go-zero/rest/httpx"
+)
+
+func checkHandler(ctx *svc.ServiceContext) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var req types.CheckReq
+		if err := httpx.Parse(r, &req); err != nil {
+			httpx.Error(w, err)
+			return
+		}
+
+		l := logic.NewCheckLogic(r.Context(), ctx)
+		resp, err := l.Check(req)
+		if err != nil {
+			httpx.Error(w, err)
+		} else {
+			httpx.WriteJson(w, http.StatusOK, resp)
+		}
+	}
+}

example/bookstore/api/internal/handler/routes.go

@@ -0,0 +1,24 @@
+// DO NOT EDIT, generated by goctl
+package handler
+
+import (
+	"bookstore/api/internal/svc"
+	"net/http"
+
+	"github.com/tal-tech/go-zero/rest"
+)
+
+func RegisterHandlers(engine *rest.Server, serverCtx *svc.ServiceContext) {
+	engine.AddRoutes([]rest.Route{
+		{
+			Method:  http.MethodGet,
+			Path:    "/add",
+			Handler: addHandler(serverCtx),
+		},
+		{
+			Method:  http.MethodGet,
+			Path:    "/check",
+			Handler: checkHandler(serverCtx),
+		},
+	})
+}

example/bookstore/api/internal/logic/addlogic.go

@@ -0,0 +1,38 @@
+package logic
+
+import (
+	"bookstore/api/internal/svc"
+	"bookstore/api/internal/types"
+	"bookstore/rpc/add/adder"
+	"context"
+
+	"github.com/tal-tech/go-zero/core/logx"
+)
+
+type AddLogic struct {
+	logx.Logger
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+}
+
+func NewAddLogic(ctx context.Context, svcCtx *svc.ServiceContext) AddLogic {
+	return AddLogic{
+		Logger: logx.WithContext(ctx),
+		ctx:    ctx,
+		svcCtx: svcCtx,
+	}
+}
+
+func (l *AddLogic) Add(req types.AddReq) (*types.AddResp, error) {
+	resp, err := l.svcCtx.Adder.Add(l.ctx, &adder.AddReq{
+		Book:  req.Book,
+		Price: req.Price,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return &types.AddResp{
+		Ok: resp.Ok,
+	}, nil
+}

example/bookstore/api/internal/logic/checklogic.go

@@ -0,0 +1,38 @@
+package logic
+
+import (
+	"bookstore/api/internal/svc"
+	"bookstore/api/internal/types"
+	"bookstore/rpc/check/checker"
+	"context"
+
+	"github.com/tal-tech/go-zero/core/logx"
+)
+
+type CheckLogic struct {
+	logx.Logger
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+}
+
+func NewCheckLogic(ctx context.Context, svcCtx *svc.ServiceContext) CheckLogic {
+	return CheckLogic{
+		Logger: logx.WithContext(ctx),
+		ctx:    ctx,
+		svcCtx: svcCtx,
+	}
+}
+
+func (l *CheckLogic) Check(req types.CheckReq) (*types.CheckResp, error) {
+	resp, err := l.svcCtx.Checker.Check(l.ctx, &checker.CheckReq{
+		Book:  req.Book,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return &types.CheckResp{
+		Found: resp.Found,
+		Price: resp.Price,
+	}, nil
+}

example/bookstore/api/internal/svc/servicecontext.go

@@ -0,0 +1,23 @@
+package svc
+
+import (
+	"bookstore/api/internal/config"
+	"bookstore/rpc/add/adder"
+	"bookstore/rpc/check/checker"
+
+	"github.com/tal-tech/go-zero/zrpc"
+)
+
+type ServiceContext struct {
+	Config  config.Config
+	Adder   adder.Adder
+	Checker checker.Checker
+}
+
+func NewServiceContext(c config.Config) *ServiceContext {
+	return &ServiceContext{
+		Config:  c,
+		Adder:   adder.NewAdder(zrpc.MustNewClient(c.Add)),
+		Checker: checker.NewChecker(zrpc.MustNewClient(c.Check)),
+	}
+}

example/bookstore/api/internal/types/types.go

@@ -0,0 +1,20 @@
+// DO NOT EDIT, generated by goctl
+package types
+
+type AddReq struct {
+	Book  string `form:"book"`
+	Price int64  `form:"price"`
+}
+
+type AddResp struct {
+	Ok bool `json:"ok"`
+}
+
+type CheckReq struct {
+	Book string `form:"book"`
+}
+
+type CheckResp struct {
+	Found bool  `json:"found"`
+	Price int64 `json:"price"`
+}

example/bookstore/go.mod

@@ -0,0 +1,11 @@
+module bookstore
+
+go 1.15
+
+require (
+	github.com/golang/mock v1.4.3
+	github.com/golang/protobuf v1.4.2
+	github.com/tal-tech/go-zero v1.0.11
+	golang.org/x/net v0.0.0-20200707034311-ab3426394381
+	google.golang.org/grpc v1.29.1
+)

example/bookstore/go.sum

@@ -0,0 +1,356 @@
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example/bookstore/rpc/add/add.go

@@ -0,0 +1,38 @@
+// Code generated by goctl. DO NOT EDIT!
+// Source: add.proto
+
+package main
+
+import (
+	"flag"
+	"fmt"
+
+	"bookstore/rpc/add/internal/config"
+	"bookstore/rpc/add/internal/server"
+	"bookstore/rpc/add/internal/svc"
+	add "bookstore/rpc/add/pb"
+
+	"github.com/tal-tech/go-zero/core/conf"
+	"github.com/tal-tech/go-zero/core/logx"
+	"github.com/tal-tech/go-zero/zrpc"
+	"google.golang.org/grpc"
+)
+
+var configFile = flag.String("f", "etc/add.yaml", "the config file")
+
+func main() {
+	flag.Parse()
+
+	var c config.Config
+	conf.MustLoad(*configFile, &c)
+	ctx := svc.NewServiceContext(c)
+	adderSrv := server.NewAdderServer(ctx)
+
+	s, err := zrpc.NewServer(c.RpcServerConf, func(grpcServer *grpc.Server) {
+		add.RegisterAdderServer(grpcServer, adderSrv)
+	})
+	logx.Must(err)
+
+	fmt.Printf("Starting rpc server at %s...\n", c.ListenOn)
+	s.Start()
+}

example/bookstore/rpc/add/add.proto

@@ -0,0 +1,16 @@
+syntax = "proto3";
+
+package add;
+
+message addReq {
+    string book = 1;
+    int64 price = 2;
+}
+
+message addResp {
+    bool ok = 1;
+}
+
+service adder {
+    rpc add(addReq) returns(addResp);
+}

example/bookstore/rpc/add/adder/adder.go

@@ -0,0 +1,62 @@
+// Code generated by goctl. DO NOT EDIT!
+// Source: add.proto
+
+//go:generate mockgen -destination ./adder_mock.go -package adder -source $GOFILE
+
+package adder
+
+import (
+	add "bookstore/rpc/add/pb"
+	"context"
+
+	"github.com/tal-tech/go-zero/core/jsonx"
+	"github.com/tal-tech/go-zero/zrpc"
+)
+
+type (
+	Adder interface {
+		Add(ctx context.Context, in *AddReq) (*AddResp, error)
+	}
+
+	defaultAdder struct {
+		cli zrpc.Client
+	}
+)
+
+func NewAdder(cli zrpc.Client) Adder {
+	return &defaultAdder{
+		cli: cli,
+	}
+}
+
+func (m *defaultAdder) Add(ctx context.Context, in *AddReq) (*AddResp, error) {
+	var request add.AddReq
+	bts, err := jsonx.Marshal(in)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	err = jsonx.Unmarshal(bts, &request)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	client := add.NewAdderClient(m.cli.Conn())
+	resp, err := client.Add(ctx, &request)
+	if err != nil {
+		return nil, err
+	}
+
+	var ret AddResp
+	bts, err = jsonx.Marshal(resp)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	err = jsonx.Unmarshal(bts, &ret)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	return &ret, nil
+}

example/bookstore/rpc/add/adder/adder_mock.go

@@ -0,0 +1,49 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: adder.go
+
+// Package adder is a generated GoMock package.
+package adder
+
+import (
+	context "context"
+	gomock "github.com/golang/mock/gomock"
+	reflect "reflect"
+)
+
+// MockAdder is a mock of Adder interface
+type MockAdder struct {
+	ctrl     *gomock.Controller
+	recorder *MockAdderMockRecorder
+}
+
+// MockAdderMockRecorder is the mock recorder for MockAdder
+type MockAdderMockRecorder struct {
+	mock *MockAdder
+}
+
+// NewMockAdder creates a new mock instance
+func NewMockAdder(ctrl *gomock.Controller) *MockAdder {
+	mock := &MockAdder{ctrl: ctrl}
+	mock.recorder = &MockAdderMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockAdder) EXPECT() *MockAdderMockRecorder {
+	return m.recorder
+}
+
+// Add mocks base method
+func (m *MockAdder) Add(ctx context.Context, in *AddReq) (*AddResp, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Add", ctx, in)
+	ret0, _ := ret[0].(*AddResp)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Add indicates an expected call of Add
+func (mr *MockAdderMockRecorder) Add(ctx, in interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Add", reflect.TypeOf((*MockAdder)(nil).Add), ctx, in)
+}

example/bookstore/rpc/add/adder/types.go

@@ -0,0 +1,19 @@
+// Code generated by goctl. DO NOT EDIT!
+// Source: add.proto
+
+package adder
+
+import "errors"
+
+var errJsonConvert = errors.New("json convert error")
+
+type (
+	AddReq struct {
+		Book  string `json:"book,omitempty"`
+		Price int64  `json:"price,omitempty"`
+	}
+
+	AddResp struct {
+		Ok bool `json:"ok,omitempty"`
+	}
+)

example/bookstore/rpc/add/etc/add.yaml

@@ -0,0 +1,10 @@
+Name: add.rpc
+ListenOn: 127.0.0.1:8080
+Etcd:
+  Hosts:
+  - 127.0.0.1:2379
+  Key: add.rpc
+DataSource: root:@tcp(localhost:3306)/gozero
+Table: book
+Cache:
+  - Host: localhost:6379

example/bookstore/rpc/add/internal/config/config.go

@@ -0,0 +1,13 @@
+package config
+
+import (
+	"github.com/tal-tech/go-zero/core/stores/cache"
+	"github.com/tal-tech/go-zero/zrpc"
+)
+
+type Config struct {
+	zrpc.RpcServerConf
+	DataSource string
+	Table      string
+	Cache      cache.CacheConf
+}

example/bookstore/rpc/add/internal/logic/addlogic.go

@@ -0,0 +1,38 @@
+package logic
+
+import (
+	"bookstore/rpc/add/internal/svc"
+	add "bookstore/rpc/add/pb"
+	"bookstore/rpc/model"
+	"context"
+
+	"github.com/tal-tech/go-zero/core/logx"
+)
+
+type AddLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewAddLogic(ctx context.Context, svcCtx *svc.ServiceContext) *AddLogic {
+	return &AddLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+func (l *AddLogic) Add(in *add.AddReq) (*add.AddResp, error) {
+	_, err := l.svcCtx.Model.Insert(model.Book{
+		Book:  in.Book,
+		Price: in.Price,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return &add.AddResp{
+		Ok: true,
+	}, nil
+}

example/bookstore/rpc/add/internal/server/adderserver.go

@@ -0,0 +1,26 @@
+// Code generated by goctl. DO NOT EDIT!
+// Source: add.proto
+
+package server
+
+import (
+	"bookstore/rpc/add/internal/logic"
+	"bookstore/rpc/add/internal/svc"
+	add "bookstore/rpc/add/pb"
+	"context"
+)
+
+type AdderServer struct {
+	svcCtx *svc.ServiceContext
+}
+
+func NewAdderServer(svcCtx *svc.ServiceContext) *AdderServer {
+	return &AdderServer{
+		svcCtx: svcCtx,
+	}
+}
+
+func (s *AdderServer) Add(ctx context.Context, in *add.AddReq) (*add.AddResp, error) {
+	l := logic.NewAddLogic(ctx, s.svcCtx)
+	return l.Add(in)
+}

example/bookstore/rpc/add/internal/svc/servicecontext.go

@@ -0,0 +1,20 @@
+package svc
+
+import (
+	"bookstore/rpc/add/internal/config"
+	"bookstore/rpc/model"
+
+	"github.com/tal-tech/go-zero/core/stores/sqlx"
+)
+
+type ServiceContext struct {
+	c     config.Config
+	Model *model.BookModel
+}
+
+func NewServiceContext(c config.Config) *ServiceContext {
+	return &ServiceContext{
+		c:             c,
+		Model: model.NewBookModel(sqlx.NewMysql(c.DataSource), c.Cache, c.Table),
+	}
+}

example/bookstore/rpc/add/pb/add.pb.go

@@ -0,0 +1,167 @@
+// Code generated by protoc-gen-go.
+// source: add.proto
+// DO NOT EDIT!
+
+/*
+Package add is a generated protocol buffer package.
+
+It is generated from these files:
+	add.proto
+
+It has these top-level messages:
+	AddReq
+	AddResp
+*/
+package add
+
+import proto "github.com/golang/protobuf/proto"
+import fmt "fmt"
+import math "math"
+
+import (
+	context "golang.org/x/net/context"
+	grpc "google.golang.org/grpc"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
+
+type AddReq struct {
+	Book  string `protobuf:"bytes,1,opt,name=book" json:"book,omitempty"`
+	Price int64  `protobuf:"varint,2,opt,name=price" json:"price,omitempty"`
+}
+
+func (m *AddReq) Reset()                    { *m = AddReq{} }
+func (m *AddReq) String() string            { return proto.CompactTextString(m) }
+func (*AddReq) ProtoMessage()               {}
+func (*AddReq) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
+
+func (m *AddReq) GetBook() string {
+	if m != nil {
+		return m.Book
+	}
+	return ""
+}
+
+func (m *AddReq) GetPrice() int64 {
+	if m != nil {
+		return m.Price
+	}
+	return 0
+}
+
+type AddResp struct {
+	Ok bool `protobuf:"varint,1,opt,name=ok" json:"ok,omitempty"`
+}
+
+func (m *AddResp) Reset()                    { *m = AddResp{} }
+func (m *AddResp) String() string            { return proto.CompactTextString(m) }
+func (*AddResp) ProtoMessage()               {}
+func (*AddResp) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{1} }
+
+func (m *AddResp) GetOk() bool {
+	if m != nil {
+		return m.Ok
+	}
+	return false
+}
+
+func init() {
+	proto.RegisterType((*AddReq)(nil), "add.addReq")
+	proto.RegisterType((*AddResp)(nil), "add.addResp")
+}
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ grpc.ClientConn
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion4
+
+// Client API for Adder service
+
+type AdderClient interface {
+	Add(ctx context.Context, in *AddReq, opts ...grpc.CallOption) (*AddResp, error)
+}
+
+type adderClient struct {
+	cc *grpc.ClientConn
+}
+
+func NewAdderClient(cc *grpc.ClientConn) AdderClient {
+	return &adderClient{cc}
+}
+
+func (c *adderClient) Add(ctx context.Context, in *AddReq, opts ...grpc.CallOption) (*AddResp, error) {
+	out := new(AddResp)
+	err := grpc.Invoke(ctx, "/add.adder/add", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// Server API for Adder service
+
+type AdderServer interface {
+	Add(context.Context, *AddReq) (*AddResp, error)
+}
+
+func RegisterAdderServer(s *grpc.Server, srv AdderServer) {
+	s.RegisterService(&_Adder_serviceDesc, srv)
+}
+
+func _Adder_Add_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(AddReq)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(AdderServer).Add(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/add.adder/Add",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(AdderServer).Add(ctx, req.(*AddReq))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+var _Adder_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "add.adder",
+	HandlerType: (*AdderServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "add",
+			Handler:    _Adder_Add_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "add.proto",
+}
+
+func init() { proto.RegisterFile("add.proto", fileDescriptor0) }
+
+var fileDescriptor0 = []byte{
+	// 136 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xe2, 0xe2, 0x4c, 0x4c, 0x49, 0xd1,
+	0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17, 0x62, 0x4e, 0x4c, 0x49, 0x51, 0x32, 0xe2, 0x62, 0x4b, 0x4c,
+	0x49, 0x09, 0x4a, 0x2d, 0x14, 0x12, 0xe2, 0x62, 0x49, 0xca, 0xcf, 0xcf, 0x96, 0x60, 0x54, 0x60,
+	0xd4, 0xe0, 0x0c, 0x02, 0xb3, 0x85, 0x44, 0xb8, 0x58, 0x0b, 0x8a, 0x32, 0x93, 0x53, 0x25, 0x98,
+	0x14, 0x18, 0x35, 0x98, 0x83, 0x20, 0x1c, 0x25, 0x49, 0x2e, 0x76, 0xb0, 0x9e, 0xe2, 0x02, 0x21,
+	0x3e, 0x2e, 0x26, 0xa8, 0x16, 0x8e, 0x20, 0xa6, 0xfc, 0x6c, 0x23, 0x4d, 0x2e, 0xd6, 0xc4, 0x94,
+	0x94, 0xd4, 0x22, 0x21, 0x05, 0x2e, 0x90, 0xf1, 0x42, 0xdc, 0x7a, 0x20, 0xfb, 0x20, 0x36, 0x48,
+	0xf1, 0x20, 0x38, 0xc5, 0x05, 0x49, 0x6c, 0x60, 0x57, 0x18, 0x03, 0x02, 0x00, 0x00, 0xff, 0xff,
+	0xe2, 0x6d, 0xb5, 0x91, 0x92, 0x00, 0x00, 0x00,
+}

example/bookstore/rpc/check/check.go

@@ -0,0 +1,38 @@
+// Code generated by goctl. DO NOT EDIT!
+// Source: check.proto
+
+package main
+
+import (
+	"flag"
+	"fmt"
+
+	"bookstore/rpc/check/internal/config"
+	"bookstore/rpc/check/internal/server"
+	"bookstore/rpc/check/internal/svc"
+	check "bookstore/rpc/check/pb"
+
+	"github.com/tal-tech/go-zero/core/conf"
+	"github.com/tal-tech/go-zero/core/logx"
+	"github.com/tal-tech/go-zero/zrpc"
+	"google.golang.org/grpc"
+)
+
+var configFile = flag.String("f", "etc/check.yaml", "the config file")
+
+func main() {
+	flag.Parse()
+
+	var c config.Config
+	conf.MustLoad(*configFile, &c)
+	ctx := svc.NewServiceContext(c)
+	checkerSrv := server.NewCheckerServer(ctx)
+
+	s, err := zrpc.NewServer(c.RpcServerConf, func(grpcServer *grpc.Server) {
+		check.RegisterCheckerServer(grpcServer, checkerSrv)
+	})
+	logx.Must(err)
+
+	fmt.Printf("Starting rpc server at %s...\n", c.ListenOn)
+	s.Start()
+}

example/bookstore/rpc/check/check.proto

@@ -0,0 +1,16 @@
+syntax = "proto3";
+
+package check;
+
+message checkReq {
+    string book = 1;
+}
+
+message checkResp {
+    bool found = 1;
+    int64 price = 2;
+}
+
+service checker {
+    rpc check(checkReq) returns(checkResp);
+}

example/bookstore/rpc/check/checker/checker.go

@@ -0,0 +1,62 @@
+// Code generated by goctl. DO NOT EDIT!
+// Source: check.proto
+
+//go:generate mockgen -destination ./checker_mock.go -package checker -source $GOFILE
+
+package checker
+
+import (
+	check "bookstore/rpc/check/pb"
+	"context"
+
+	"github.com/tal-tech/go-zero/core/jsonx"
+	"github.com/tal-tech/go-zero/zrpc"
+)
+
+type (
+	Checker interface {
+		Check(ctx context.Context, in *CheckReq) (*CheckResp, error)
+	}
+
+	defaultChecker struct {
+		cli zrpc.Client
+	}
+)
+
+func NewChecker(cli zrpc.Client) Checker {
+	return &defaultChecker{
+		cli: cli,
+	}
+}
+
+func (m *defaultChecker) Check(ctx context.Context, in *CheckReq) (*CheckResp, error) {
+	var request check.CheckReq
+	bts, err := jsonx.Marshal(in)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	err = jsonx.Unmarshal(bts, &request)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	client := check.NewCheckerClient(m.cli.Conn())
+	resp, err := client.Check(ctx, &request)
+	if err != nil {
+		return nil, err
+	}
+
+	var ret CheckResp
+	bts, err = jsonx.Marshal(resp)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	err = jsonx.Unmarshal(bts, &ret)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	return &ret, nil
+}

example/bookstore/rpc/check/checker/checker_mock.go

@@ -0,0 +1,49 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: checker.go
+
+// Package checker is a generated GoMock package.
+package checker
+
+import (
+	context "context"
+	gomock "github.com/golang/mock/gomock"
+	reflect "reflect"
+)
+
+// MockChecker is a mock of Checker interface
+type MockChecker struct {
+	ctrl     *gomock.Controller
+	recorder *MockCheckerMockRecorder
+}
+
+// MockCheckerMockRecorder is the mock recorder for MockChecker
+type MockCheckerMockRecorder struct {
+	mock *MockChecker
+}
+
+// NewMockChecker creates a new mock instance
+func NewMockChecker(ctrl *gomock.Controller) *MockChecker {
+	mock := &MockChecker{ctrl: ctrl}
+	mock.recorder = &MockCheckerMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockChecker) EXPECT() *MockCheckerMockRecorder {
+	return m.recorder
+}
+
+// Check mocks base method
+func (m *MockChecker) Check(ctx context.Context, in *CheckReq) (*CheckResp, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Check", ctx, in)
+	ret0, _ := ret[0].(*CheckResp)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Check indicates an expected call of Check
+func (mr *MockCheckerMockRecorder) Check(ctx, in interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Check", reflect.TypeOf((*MockChecker)(nil).Check), ctx, in)
+}

example/bookstore/rpc/check/checker/types.go

@@ -0,0 +1,19 @@
+// Code generated by goctl. DO NOT EDIT!
+// Source: check.proto
+
+package checker
+
+import "errors"
+
+var errJsonConvert = errors.New("json convert error")
+
+type (
+	CheckReq struct {
+		Book string `json:"book,omitempty"`
+	}
+
+	CheckResp struct {
+		Found bool  `json:"found,omitempty"`
+		Price int64 `json:"price,omitempty"`
+	}
+)

example/bookstore/rpc/check/etc/check.yaml

@@ -0,0 +1,10 @@
+Name: check.rpc
+ListenOn: 127.0.0.1:8081
+Etcd:
+  Hosts:
+  - 127.0.0.1:2379
+  Key: check.rpc
+DataSource: root:@tcp(localhost:3306)/gozero
+Table: book
+Cache:
+  - Host: localhost:6379

example/bookstore/rpc/check/internal/config/config.go

@@ -0,0 +1,13 @@
+package config
+
+import (
+	"github.com/tal-tech/go-zero/core/stores/cache"
+	"github.com/tal-tech/go-zero/zrpc"
+)
+
+type Config struct {
+	zrpc.RpcServerConf
+	DataSource string
+	Table      string
+	Cache      cache.CacheConf
+}

example/bookstore/rpc/check/internal/logic/checklogic.go

@@ -0,0 +1,35 @@
+package logic
+
+import (
+	"bookstore/rpc/check/internal/svc"
+	check "bookstore/rpc/check/pb"
+	"context"
+
+	"github.com/tal-tech/go-zero/core/logx"
+)
+
+type CheckLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewCheckLogic(ctx context.Context, svcCtx *svc.ServiceContext) *CheckLogic {
+	return &CheckLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+func (l *CheckLogic) Check(in *check.CheckReq) (*check.CheckResp, error) {
+	resp, err := l.svcCtx.Model.FindOne(in.Book)
+	if err != nil {
+		return nil, err
+	}
+
+	return &check.CheckResp{
+		Found: true,
+		Price: resp.Price,
+	}, nil
+}

example/bookstore/rpc/check/internal/server/checkerserver.go

@@ -0,0 +1,26 @@
+// Code generated by goctl. DO NOT EDIT!
+// Source: check.proto
+
+package server
+
+import (
+	"bookstore/rpc/check/internal/logic"
+	"bookstore/rpc/check/internal/svc"
+	check "bookstore/rpc/check/pb"
+	"context"
+)
+
+type CheckerServer struct {
+	svcCtx *svc.ServiceContext
+}
+
+func NewCheckerServer(svcCtx *svc.ServiceContext) *CheckerServer {
+	return &CheckerServer{
+		svcCtx: svcCtx,
+	}
+}
+
+func (s *CheckerServer) Check(ctx context.Context, in *check.CheckReq) (*check.CheckResp, error) {
+	l := logic.NewCheckLogic(ctx, s.svcCtx)
+	return l.Check(in)
+}

example/bookstore/rpc/check/internal/svc/servicecontext.go

@@ -0,0 +1,20 @@
+package svc
+
+import (
+	"bookstore/rpc/check/internal/config"
+	"bookstore/rpc/model"
+
+	"github.com/tal-tech/go-zero/core/stores/sqlx"
+)
+
+type ServiceContext struct {
+	c     config.Config
+	Model *model.BookModel
+}
+
+func NewServiceContext(c config.Config) *ServiceContext {
+	return &ServiceContext{
+		c:             c,
+		Model: model.NewBookModel(sqlx.NewMysql(c.DataSource), c.Cache, c.Table),
+	}
+}

example/bookstore/rpc/check/pb/check.pb.go

@@ -0,0 +1,167 @@
+// Code generated by protoc-gen-go.
+// source: check.proto
+// DO NOT EDIT!
+
+/*
+Package check is a generated protocol buffer package.
+
+It is generated from these files:
+	check.proto
+
+It has these top-level messages:
+	CheckReq
+	CheckResp
+*/
+package check
+
+import proto "github.com/golang/protobuf/proto"
+import fmt "fmt"
+import math "math"
+
+import (
+	context "golang.org/x/net/context"
+	grpc "google.golang.org/grpc"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
+
+type CheckReq struct {
+	Book string `protobuf:"bytes,1,opt,name=book" json:"book,omitempty"`
+}
+
+func (m *CheckReq) Reset()                    { *m = CheckReq{} }
+func (m *CheckReq) String() string            { return proto.CompactTextString(m) }
+func (*CheckReq) ProtoMessage()               {}
+func (*CheckReq) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
+
+func (m *CheckReq) GetBook() string {
+	if m != nil {
+		return m.Book
+	}
+	return ""
+}
+
+type CheckResp struct {
+	Found bool  `protobuf:"varint,1,opt,name=found" json:"found,omitempty"`
+	Price int64 `protobuf:"varint,2,opt,name=price" json:"price,omitempty"`
+}
+
+func (m *CheckResp) Reset()                    { *m = CheckResp{} }
+func (m *CheckResp) String() string            { return proto.CompactTextString(m) }
+func (*CheckResp) ProtoMessage()               {}
+func (*CheckResp) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{1} }
+
+func (m *CheckResp) GetFound() bool {
+	if m != nil {
+		return m.Found
+	}
+	return false
+}
+
+func (m *CheckResp) GetPrice() int64 {
+	if m != nil {
+		return m.Price
+	}
+	return 0
+}
+
+func init() {
+	proto.RegisterType((*CheckReq)(nil), "check.checkReq")
+	proto.RegisterType((*CheckResp)(nil), "check.checkResp")
+}
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ grpc.ClientConn
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion4
+
+// Client API for Checker service
+
+type CheckerClient interface {
+	Check(ctx context.Context, in *CheckReq, opts ...grpc.CallOption) (*CheckResp, error)
+}
+
+type checkerClient struct {
+	cc *grpc.ClientConn
+}
+
+func NewCheckerClient(cc *grpc.ClientConn) CheckerClient {
+	return &checkerClient{cc}
+}
+
+func (c *checkerClient) Check(ctx context.Context, in *CheckReq, opts ...grpc.CallOption) (*CheckResp, error) {
+	out := new(CheckResp)
+	err := grpc.Invoke(ctx, "/check.checker/check", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// Server API for Checker service
+
+type CheckerServer interface {
+	Check(context.Context, *CheckReq) (*CheckResp, error)
+}
+
+func RegisterCheckerServer(s *grpc.Server, srv CheckerServer) {
+	s.RegisterService(&_Checker_serviceDesc, srv)
+}
+
+func _Checker_Check_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(CheckReq)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CheckerServer).Check(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/check.checker/Check",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CheckerServer).Check(ctx, req.(*CheckReq))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+var _Checker_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "check.checker",
+	HandlerType: (*CheckerServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "check",
+			Handler:    _Checker_Check_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "check.proto",
+}
+
+func init() { proto.RegisterFile("check.proto", fileDescriptor0) }
+
+var fileDescriptor0 = []byte{
+	// 136 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xe2, 0xe2, 0x4e, 0xce, 0x48, 0x4d,
+	0xce, 0xd6, 0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17, 0x62, 0x05, 0x73, 0x94, 0xe4, 0xb8, 0x38, 0xc0,
+	0x8c, 0xa0, 0xd4, 0x42, 0x21, 0x21, 0x2e, 0x96, 0xa4, 0xfc, 0xfc, 0x6c, 0x09, 0x46, 0x05, 0x46,
+	0x0d, 0xce, 0x20, 0x30, 0x5b, 0xc9, 0x9c, 0x8b, 0x13, 0x2a, 0x5f, 0x5c, 0x20, 0x24, 0xc2, 0xc5,
+	0x9a, 0x96, 0x5f, 0x9a, 0x97, 0x02, 0x56, 0xc1, 0x11, 0x04, 0xe1, 0x80, 0x44, 0x0b, 0x8a, 0x32,
+	0x93, 0x53, 0x25, 0x98, 0x14, 0x18, 0x35, 0x98, 0x83, 0x20, 0x1c, 0x23, 0x53, 0x2e, 0x76, 0xb0,
+	0xc6, 0xd4, 0x22, 0x21, 0x2d, 0x2e, 0x88, 0x65, 0x42, 0xfc, 0x7a, 0x10, 0x17, 0xc0, 0x6c, 0x94,
+	0x12, 0x40, 0x15, 0x28, 0x2e, 0x48, 0x62, 0x03, 0xbb, 0xce, 0x18, 0x10, 0x00, 0x00, 0xff, 0xff,
+	0x6e, 0x6f, 0xa7, 0x1d, 0xac, 0x00, 0x00, 0x00,
+}

example/bookstore/rpc/model/book.sql

@@ -0,0 +1,6 @@
+CREATE TABLE `book`
+(
+  `book` varchar(255) NOT NULL COMMENT 'book name',
+  `price` int NOT NULL COMMENT 'book price',
+  PRIMARY KEY(`book`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

example/bookstore/rpc/model/bookmodel.go

@@ -0,0 +1,82 @@
+package model
+
+import (
+	"database/sql"
+	"fmt"
+	"strings"
+
+	"github.com/tal-tech/go-zero/core/stores/cache"
+	"github.com/tal-tech/go-zero/core/stores/sqlc"
+	"github.com/tal-tech/go-zero/core/stores/sqlx"
+	"github.com/tal-tech/go-zero/core/stringx"
+	"github.com/tal-tech/go-zero/tools/goctl/model/sql/builderx"
+)
+
+var (
+	bookFieldNames          = builderx.FieldNames(&Book{})
+	bookRows                = strings.Join(bookFieldNames, ",")
+	bookRowsExpectAutoSet   = strings.Join(stringx.Remove(bookFieldNames, "create_time", "update_time"), ",")
+	bookRowsWithPlaceHolder = strings.Join(stringx.Remove(bookFieldNames, "book", "create_time", "update_time"), "=?,") + "=?"
+
+	cacheBookBookPrefix = "cache#Book#book#"
+)
+
+type (
+	BookModel struct {
+		sqlc.CachedConn
+		table string
+	}
+
+	Book struct {
+		Book  string `db:"book"`  // book name
+		Price int64  `db:"price"` // book price
+	}
+)
+
+func NewBookModel(conn sqlx.SqlConn, c cache.CacheConf, table string) *BookModel {
+	return &BookModel{
+		CachedConn: sqlc.NewConn(conn, c),
+		table:      table,
+	}
+}
+
+func (m *BookModel) Insert(data Book) (sql.Result, error) {
+	query := `insert into ` + m.table + ` (` + bookRowsExpectAutoSet + `) values (?, ?)`
+	return m.ExecNoCache(query, data.Book, data.Price)
+}
+
+func (m *BookModel) FindOne(book string) (*Book, error) {
+	bookBookKey := fmt.Sprintf("%s%v", cacheBookBookPrefix, book)
+	var resp Book
+	err := m.QueryRow(&resp, bookBookKey, func(conn sqlx.SqlConn, v interface{}) error {
+		query := `select ` + bookRows + ` from ` + m.table + ` where book = ? limit 1`
+		return conn.QueryRow(v, query, book)
+	})
+	switch err {
+	case nil:
+		return &resp, nil
+	case sqlc.ErrNotFound:
+		return nil, ErrNotFound
+	default:
+		return nil, err
+	}
+}
+
+func (m *BookModel) Update(data Book) error {
+	bookBookKey := fmt.Sprintf("%s%v", cacheBookBookPrefix, data.Book)
+	_, err := m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) {
+		query := `update ` + m.table + ` set ` + bookRowsWithPlaceHolder + ` where book = ?`
+		return conn.Exec(query, data.Price, data.Book)
+	}, bookBookKey)
+	return err
+}
+
+func (m *BookModel) Delete(book string) error {
+
+	bookBookKey := fmt.Sprintf("%s%v", cacheBookBookPrefix, book)
+	_, err := m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) {
+		query := `delete from ` + m.table + ` where book = ?`
+		return conn.Exec(query, book)
+	}, bookBookKey)
+	return err
+}

example/bookstore/rpc/model/vars.go

@@ -0,0 +1,5 @@
+package model
+
+import "github.com/tal-tech/go-zero/core/stores/sqlx"
+
+var ErrNotFound = sqlx.ErrNotFound

example/graceful/dns/api/config/config.go

@@ -2,10 +2,10 @@ package config
 
 import (
 	"github.com/tal-tech/go-zero/rest"
-	"github.com/tal-tech/go-zero/rpcx"
+	"github.com/tal-tech/go-zero/zrpc"
 )
 
 type Config struct {
 	rest.RestConf
-	Rpc rpcx.RpcClientConf
+	Rpc zrpc.RpcClientConf
 }

example/graceful/dns/api/graceful.go

@@ -8,7 +8,7 @@ import (
 	"github.com/tal-tech/go-zero/example/graceful/dns/api/handler"
 	"github.com/tal-tech/go-zero/example/graceful/dns/api/svc"
 	"github.com/tal-tech/go-zero/rest"
-	"github.com/tal-tech/go-zero/rpcx"
+	"github.com/tal-tech/go-zero/zrpc"
 )
 
 var configFile = flag.String("f", "etc/graceful-api.json", "the config file")
@@ -19,7 +19,7 @@ func main() {
 	var c config.Config
 	conf.MustLoad(*configFile, &c)
 
-	client := rpcx.MustNewClient(c.Rpc)
+	client := zrpc.MustNewClient(c.Rpc)
 	ctx := &svc.ServiceContext{
 		Client: client,
 	}

example/graceful/dns/api/svc/servicecontext.go

@@ -1,7 +1,7 @@
 package svc
 
-import "github.com/tal-tech/go-zero/rpcx"
+import "github.com/tal-tech/go-zero/zrpc"
 
 type ServiceContext struct {
-	Client rpcx.Client
+	Client zrpc.Client
 }

example/graceful/dns/rpc/gracefulrpc.go

@@ -9,7 +9,7 @@ import (
 
 	"github.com/tal-tech/go-zero/core/conf"
 	"github.com/tal-tech/go-zero/example/graceful/dns/rpc/graceful"
-	"github.com/tal-tech/go-zero/rpcx"
+	"github.com/tal-tech/go-zero/zrpc"
 	"google.golang.org/grpc"
 )
 
@@ -39,10 +39,10 @@ func (gs *GracefulServer) Grace(ctx context.Context, req *graceful.Request) (*gr
 func main() {
 	flag.Parse()
 
-	var c rpcx.RpcServerConf
+	var c zrpc.RpcServerConf
 	conf.MustLoad(*configFile, &c)
 
-	server := rpcx.MustNewServer(c, func(grpcServer *grpc.Server) {
+	server := zrpc.MustNewServer(c, func(grpcServer *grpc.Server) {
 		graceful.RegisterGraceServiceServer(grpcServer, NewGracefulServer())
 	})
 	defer server.Stop()

example/graceful/etcd/api/config/config.go

@@ -2,10 +2,10 @@ package config
 
 import (
 	"github.com/tal-tech/go-zero/rest"
-	"github.com/tal-tech/go-zero/rpcx"
+	"github.com/tal-tech/go-zero/zrpc"
 )
 
 type Config struct {
 	rest.RestConf
-	Rpc rpcx.RpcClientConf
+	Rpc zrpc.RpcClientConf
 }

example/graceful/etcd/api/etc/graceful-api.json

@@ -6,7 +6,7 @@
     "Rpc": {
         "Etcd": {
             "Hosts": ["etcd.discov:2379"],
-            "Key": "rpcx"
+            "Key": "zrpc"
         }
     }
-}
+}

example/graceful/etcd/api/graceful.go

@@ -8,7 +8,7 @@ import (
 	"github.com/tal-tech/go-zero/example/graceful/etcd/api/handler"
 	"github.com/tal-tech/go-zero/example/graceful/etcd/api/svc"
 	"github.com/tal-tech/go-zero/rest"
-	"github.com/tal-tech/go-zero/rpcx"
+	"github.com/tal-tech/go-zero/zrpc"
 )
 
 var configFile = flag.String("f", "etc/graceful-api.json", "the config file")
@@ -19,7 +19,7 @@ func main() {
 	var c config.Config
 	conf.MustLoad(*configFile, &c)
 
-	client := rpcx.MustNewClient(c.Rpc)
+	client := zrpc.MustNewClient(c.Rpc)
 	ctx := &svc.ServiceContext{
 		Client: client,
 	}

example/graceful/etcd/api/svc/servicecontext.go

@@ -1,7 +1,7 @@
 package svc
 
-import "github.com/tal-tech/go-zero/rpcx"
+import "github.com/tal-tech/go-zero/zrpc"
 
 type ServiceContext struct {
-	Client rpcx.Client
+	Client zrpc.Client
 }

example/graceful/etcd/rpc/etc/graceful-rpc.json

@@ -3,6 +3,6 @@
     "ListenOn": "0.0.0.0:3456",
     "Etcd": {
         "Hosts": ["etcd.discov:2379"],
-        "Key": "rpcx"
+        "Key": "zrpc"
     }
 }

example/graceful/etcd/rpc/gracefulrpc.go

@@ -9,7 +9,7 @@ import (
 
 	"github.com/tal-tech/go-zero/core/conf"
 	"github.com/tal-tech/go-zero/example/graceful/etcd/rpc/graceful"
-	"github.com/tal-tech/go-zero/rpcx"
+	"github.com/tal-tech/go-zero/zrpc"
 	"google.golang.org/grpc"
 )
 
@@ -39,10 +39,10 @@ func (gs *GracefulServer) Grace(ctx context.Context, req *graceful.Request) (*gr
 func main() {
 	flag.Parse()
 
-	var c rpcx.RpcServerConf
+	var c zrpc.RpcServerConf
 	conf.MustLoad(*configFile, &c)
 
-	server := rpcx.MustNewServer(c, func(grpcServer *grpc.Server) {
+	server := zrpc.MustNewServer(c, func(grpcServer *grpc.Server) {
 		graceful.RegisterGraceServiceServer(grpcServer, NewGracefulServer())
 	})
 	defer server.Stop()

example/load/simulate/cpu/cpu-accuracy.md

@@ -25,4 +25,3 @@
    `watch -n 5 kubectl top pod -n adhoc`
 
    可以看到`kubectl`报告的`CPU`使用率，两者进行对比，即可知道是否准确
-

example/mapreduce/deadlock/main.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"log"
+	"strconv"
+
+	"github.com/tal-tech/go-zero/core/mr"
+)
+
+type User struct {
+	Uid  int
+	Name string
+}
+
+func main() {
+	uids := []int{111, 222, 333}
+	res, err := mr.MapReduce(func(source chan<- interface{}) {
+		for _, uid := range uids {
+			source <- uid
+		}
+	}, func(item interface{}, writer mr.Writer, cancel func(error)) {
+		uid := item.(int)
+		user := &User{
+			Uid:  uid,
+			Name: strconv.Itoa(uid),
+		}
+		writer.Write(user)
+	}, func(pipe <-chan interface{}, writer mr.Writer, cancel func(error)) {
+		var users []*User
+		for p := range pipe {
+			users = append(users, p.(*User))
+		}
+		// missing writer.Write(...), should not panic
+	})
+	if err != nil {
+		log.Print(err)
+		return
+	}
+	log.Print(len(res.([]*User)))
+}

example/mapreduce/mr/mr.go

@@ -0,0 +1,114 @@
+package main
+
+import (
+	"log"
+	"time"
+
+	"github.com/tal-tech/go-zero/core/mr"
+	"github.com/tal-tech/go-zero/core/timex"
+)
+
+type user struct{}
+
+func (u *user) User(uid int64) (interface{}, error) {
+	time.Sleep(time.Millisecond * 30)
+	return nil, nil
+}
+
+type store struct{}
+
+func (s *store) Store(pid int64) (interface{}, error) {
+	time.Sleep(time.Millisecond * 50)
+	return nil, nil
+}
+
+type order struct{}
+
+func (o *order) Order(pid int64) (interface{}, error) {
+	time.Sleep(time.Millisecond * 40)
+	return nil, nil
+}
+
+var (
+	userRpc  user
+	storeRpc store
+	orderRpc order
+)
+
+func main() {
+	start := timex.Now()
+	_, err := productDetail(123, 345)
+	if err != nil {
+		log.Printf("product detail error: %v", err)
+		return
+	}
+	log.Printf("productDetail time: %v", timex.Since(start))
+
+	// the data processing
+	res, err := checkLegal([]int64{1, 2, 3})
+	if err != nil {
+		log.Printf("check error: %v", err)
+		return
+	}
+	log.Printf("check res: %v", res)
+}
+
+type ProductDetail struct {
+	User  interface{}
+	Store interface{}
+	Order interface{}
+}
+
+func productDetail(uid, pid int64) (*ProductDetail, error) {
+	var pd ProductDetail
+	err := mr.Finish(func() (err error) {
+		pd.User, err = userRpc.User(uid)
+		return
+	}, func() (err error) {
+		pd.Store, err = storeRpc.Store(pid)
+		return
+	}, func() (err error) {
+		pd.Order, err = orderRpc.Order(pid)
+		return
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &pd, nil
+}
+
+func checkLegal(uids []int64) ([]int64, error) {
+	r, err := mr.MapReduce(func(source chan<- interface{}) {
+		for _, uid := range uids {
+			source <- uid
+		}
+	}, func(item interface{}, writer mr.Writer, cancel func(error)) {
+		uid := item.(int64)
+		ok, err := check(uid)
+		if err != nil {
+			cancel(err)
+		}
+		if ok {
+			writer.Write(uid)
+		}
+	}, func(pipe <-chan interface{}, writer mr.Writer, cancel func(error)) {
+		var uids []int64
+		for p := range pipe {
+			uids = append(uids, p.(int64))
+		}
+		writer.Write(uids)
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return r.([]int64), nil
+}
+
+func check(uid int64) (bool, error) {
+	// do something check user legal
+	time.Sleep(time.Millisecond * 20)
+	return true, nil
+}

example/rpc/client/direct/client.go

@@ -8,7 +8,7 @@ import (
 
 	"github.com/tal-tech/go-zero/core/discov"
 	"github.com/tal-tech/go-zero/example/rpc/remote/unary"
-	"github.com/tal-tech/go-zero/rpcx"
+	"github.com/tal-tech/go-zero/zrpc"
 )
 
 const timeFormat = "15:04:05"
@@ -16,10 +16,10 @@ const timeFormat = "15:04:05"
 func main() {
 	flag.Parse()
 
-	client := rpcx.MustNewClient(rpcx.RpcClientConf{
+	client := zrpc.MustNewClient(zrpc.RpcClientConf{
 		Etcd: discov.EtcdConf{
 			Hosts: []string{"localhost:2379"},
-			Key:   "rpcx",
+			Key:   "zrpc",
 		},
 	})
 

example/rpc/client/lb/main.go

@@ -9,7 +9,7 @@ import (
 
 	"github.com/tal-tech/go-zero/core/discov"
 	"github.com/tal-tech/go-zero/example/rpc/remote/unary"
-	"github.com/tal-tech/go-zero/rpcx"
+	"github.com/tal-tech/go-zero/zrpc"
 )
 
 var lb = flag.String("t", "direct", "the load balancer type")
@@ -17,20 +17,20 @@ var lb = flag.String("t", "direct", "the load balancer type")
 func main() {
 	flag.Parse()
 
-	var cli rpcx.Client
+	var cli zrpc.Client
 	switch *lb {
 	case "direct":
-		cli = rpcx.MustNewClient(rpcx.RpcClientConf{
+		cli = zrpc.MustNewClient(zrpc.RpcClientConf{
 			Endpoints: []string{
 				"localhost:3456",
 				"localhost:3457",
 			},
 		})
 	case "discov":
-		cli = rpcx.MustNewClient(rpcx.RpcClientConf{
+		cli = zrpc.MustNewClient(zrpc.RpcClientConf{
 			Etcd: discov.EtcdConf{
 				Hosts: []string{"localhost:2379"},
-				Key:   "rpcx",
+				Key:   "zrpc",
 			},
 		})
 	default:

example/rpc/client/stream/client.go

@@ -8,17 +8,17 @@ import (
 
 	"github.com/tal-tech/go-zero/core/discov"
 	"github.com/tal-tech/go-zero/example/rpc/remote/stream"
-	"github.com/tal-tech/go-zero/rpcx"
+	"github.com/tal-tech/go-zero/zrpc"
 )
 
 const name = "kevin"
 
-var key = flag.String("key", "rpcx", "the key on etcd")
+var key = flag.String("key", "zrpc", "the key on etcd")
 
 func main() {
 	flag.Parse()
 
-	client, err := rpcx.NewClientNoAuth(discov.EtcdConf{
+	client, err := zrpc.NewClientNoAuth(discov.EtcdConf{
 		Hosts: []string{"localhost:2379"},
 		Key:   *key,
 	})

example/rpc/client/unary/client.go

@@ -8,7 +8,7 @@ import (
 
 	"github.com/tal-tech/go-zero/core/conf"
 	"github.com/tal-tech/go-zero/example/rpc/remote/unary"
-	"github.com/tal-tech/go-zero/rpcx"
+	"github.com/tal-tech/go-zero/zrpc"
 )
 
 var configFile = flag.String("f", "config.json", "the config file")
@@ -16,9 +16,9 @@ var configFile = flag.String("f", "config.json", "the config file")
 func main() {
 	flag.Parse()
 
-	var c rpcx.RpcClientConf
+	var c zrpc.RpcClientConf
 	conf.MustLoad(*configFile, &c)
-	client := rpcx.MustNewClient(c)
+	client := zrpc.MustNewClient(c)
 	ticker := time.NewTicker(time.Millisecond * 500)
 	defer ticker.Stop()
 	for {

example/rpc/proxy/proxy.go

@@ -7,7 +7,7 @@ import (
 	"github.com/tal-tech/go-zero/core/logx"
 	"github.com/tal-tech/go-zero/core/service"
 	"github.com/tal-tech/go-zero/example/rpc/remote/unary"
-	"github.com/tal-tech/go-zero/rpcx"
+	"github.com/tal-tech/go-zero/zrpc"
 	"google.golang.org/grpc"
 )
 
@@ -17,7 +17,7 @@ var (
 )
 
 type GreetServer struct {
-	*rpcx.RpcProxy
+	*zrpc.RpcProxy
 }
 
 func (s *GreetServer) Greet(ctx context.Context, req *unary.Request) (*unary.Response, error) {
@@ -33,7 +33,7 @@ func (s *GreetServer) Greet(ctx context.Context, req *unary.Request) (*unary.Res
 func main() {
 	flag.Parse()
 
-	proxy := rpcx.MustNewServer(rpcx.RpcServerConf{
+	proxy := zrpc.MustNewServer(zrpc.RpcServerConf{
 		ServiceConf: service.ServiceConf{
 			Log: logx.LogConf{
 				Mode: "console",
@@ -42,7 +42,7 @@ func main() {
 		ListenOn: *listen,
 	}, func(grpcServer *grpc.Server) {
 		unary.RegisterGreeterServer(grpcServer, &GreetServer{
-			RpcProxy: rpcx.NewProxy(*server),
+			RpcProxy: zrpc.NewProxy(*server),
 		})
 	})
 	proxy.Start()