fix golint issues in core/stores (#527)

core/stores/cache/cache.go

@@ -11,6 +11,7 @@ import (
 )
 
 type (
+	// Cache interface is used to define the cache implementation.
 	Cache interface {
 		Del(keys ...string) error
 		Get(key string, v interface{}) error
@@ -27,7 +28,8 @@ type (
 	}
 )
 
-func New(c ClusterConf, barrier syncx.SharedCalls, st *CacheStat, errNotFound error,
+// New returns a Cache.
+func New(c ClusterConf, barrier syncx.SharedCalls, st *Stat, errNotFound error,
 	opts ...Option) Cache {
 	if len(c) == 0 || TotalWeights(c) <= 0 {
 		log.Fatal("no cache nodes")

core/stores/cache/cache_test.go

@@ -102,7 +102,7 @@ func TestCache_SetDel(t *testing.T) {
 			Weight: 100,
 		},
 	}
-	c := New(conf, syncx.NewSharedCalls(), NewCacheStat("mock"), errPlaceholder)
+	c := New(conf, syncx.NewSharedCalls(), NewStat("mock"), errPlaceholder)
 	for i := 0; i < total; i++ {
 		if i%2 == 0 {
 			assert.Nil(t, c.Set(fmt.Sprintf("key/%d", i), i))
@@ -140,7 +140,7 @@ func TestCache_OneNode(t *testing.T) {
 			Weight: 100,
 		},
 	}
-	c := New(conf, syncx.NewSharedCalls(), NewCacheStat("mock"), errPlaceholder)
+	c := New(conf, syncx.NewSharedCalls(), NewStat("mock"), errPlaceholder)
 	for i := 0; i < total; i++ {
 		if i%2 == 0 {
 			assert.Nil(t, c.Set(fmt.Sprintf("key/%d", i), i))

core/stores/cache/cacheconf.go

@@ -1,3 +1,4 @@
 package cache
 
+// CacheConf is an alias of ClusterConf.
 type CacheConf = ClusterConf

core/stores/cache/cachenode.go

@@ -33,7 +33,7 @@ type cacheNode struct {
 	r              *rand.Rand
 	lock           *sync.Mutex
 	unstableExpiry mathx.Unstable
-	stat           *CacheStat
+	stat           *Stat
 	errNotFound    error
 }
 
@@ -43,7 +43,7 @@ type cacheNode struct {
 // st is used to stat the cache.
 // errNotFound defines the error that returned on cache not found.
 // opts are the options that customize the cacheNode.
-func NewNode(rds *redis.Redis, barrier syncx.SharedCalls, st *CacheStat,
+func NewNode(rds *redis.Redis, barrier syncx.SharedCalls, st *Stat,
 	errNotFound error, opts ...Option) Cache {
 	o := newOptions(opts...)
 	return cacheNode{

core/stores/cache/cachenode_test.go

@@ -36,7 +36,7 @@ func TestCacheNode_DelCache(t *testing.T) {
 		r:              rand.New(rand.NewSource(time.Now().UnixNano())),
 		lock:           new(sync.Mutex),
 		unstableExpiry: mathx.NewUnstable(expiryDeviation),
-		stat:           NewCacheStat("any"),
+		stat:           NewStat("any"),
 		errNotFound:    errTestNotFound,
 	}
 	assert.Nil(t, cn.Del())
@@ -59,7 +59,7 @@ func TestCacheNode_InvalidCache(t *testing.T) {
 		r:              rand.New(rand.NewSource(time.Now().UnixNano())),
 		lock:           new(sync.Mutex),
 		unstableExpiry: mathx.NewUnstable(expiryDeviation),
-		stat:           NewCacheStat("any"),
+		stat:           NewStat("any"),
 		errNotFound:    errTestNotFound,
 	}
 	s.Set("any", "value")
@@ -81,7 +81,7 @@ func TestCacheNode_Take(t *testing.T) {
 		barrier:        syncx.NewSharedCalls(),
 		lock:           new(sync.Mutex),
 		unstableExpiry: mathx.NewUnstable(expiryDeviation),
-		stat:           NewCacheStat("any"),
+		stat:           NewStat("any"),
 		errNotFound:    errTestNotFound,
 	}
 	var str string
@@ -108,7 +108,7 @@ func TestCacheNode_TakeNotFound(t *testing.T) {
 		barrier:        syncx.NewSharedCalls(),
 		lock:           new(sync.Mutex),
 		unstableExpiry: mathx.NewUnstable(expiryDeviation),
-		stat:           NewCacheStat("any"),
+		stat:           NewStat("any"),
 		errNotFound:    errTestNotFound,
 	}
 	var str string
@@ -147,7 +147,7 @@ func TestCacheNode_TakeWithExpire(t *testing.T) {
 		barrier:        syncx.NewSharedCalls(),
 		lock:           new(sync.Mutex),
 		unstableExpiry: mathx.NewUnstable(expiryDeviation),
-		stat:           NewCacheStat("any"),
+		stat:           NewStat("any"),
 		errNotFound:    errors.New("any"),
 	}
 	var str string
@@ -174,7 +174,7 @@ func TestCacheNode_String(t *testing.T) {
 		barrier:        syncx.NewSharedCalls(),
 		lock:           new(sync.Mutex),
 		unstableExpiry: mathx.NewUnstable(expiryDeviation),
-		stat:           NewCacheStat("any"),
+		stat:           NewStat("any"),
 		errNotFound:    errors.New("any"),
 	}
 	assert.Equal(t, store.Addr, cn.String())
@@ -191,7 +191,7 @@ func TestCacheValueWithBigInt(t *testing.T) {
 		barrier:        syncx.NewSharedCalls(),
 		lock:           new(sync.Mutex),
 		unstableExpiry: mathx.NewUnstable(expiryDeviation),
-		stat:           NewCacheStat("any"),
+		stat:           NewStat("any"),
 		errNotFound:    errors.New("any"),
 	}
 

core/stores/cache/cacheopt.go

@@ -8,11 +8,13 @@ const (
 )
 
 type (
+	// An Options is used to store the cache options.
 	Options struct {
 		Expiry         time.Duration
 		NotFoundExpiry time.Duration
 	}
 
+	// Option defines the method to customize an Options.
 	Option func(o *Options)
 )
 
@@ -32,12 +34,14 @@ func newOptions(opts ...Option) Options {
 	return o
 }
 
+// WithExpiry returns a func to customize a Options with given expiry.
 func WithExpiry(expiry time.Duration) Option {
 	return func(o *Options) {
 		o.Expiry = expiry
 	}
 }
 
+// WithNotFoundExpiry returns a func to customize a Options with given not found expiry.
 func WithNotFoundExpiry(expiry time.Duration) Option {
 	return func(o *Options) {
 		o.NotFoundExpiry = expiry

core/stores/cache/cachestat.go

@@ -9,7 +9,8 @@ import (
 
 const statInterval = time.Minute
 
-type CacheStat struct {
+// A Stat is used to stat the cache.
+type Stat struct {
 	name string
 	// export the fields to let the unit tests working,
 	// reside in internal package, doesn't matter.
@@ -19,8 +20,9 @@ type CacheStat struct {
 	DbFails uint64
 }
 
-func NewCacheStat(name string) *CacheStat {
+// NewStat returns a Stat.
-	ret := &CacheStat{
+func NewStat(name string) *Stat {
+	ret := &Stat{
 		name: name,
 	}
 	go ret.statLoop()
@@ -28,37 +30,41 @@ func NewCacheStat(name string) *CacheStat {
 	return ret
 }
 
-func (cs *CacheStat) IncrementTotal() {
+// IncrementTotal increments the total count.
-	atomic.AddUint64(&cs.Total, 1)
+func (s *Stat) IncrementTotal() {
+	atomic.AddUint64(&s.Total, 1)
 }
 
-func (cs *CacheStat) IncrementHit() {
+// IncrementHit increments the hit count.
-	atomic.AddUint64(&cs.Hit, 1)
+func (s *Stat) IncrementHit() {
+	atomic.AddUint64(&s.Hit, 1)
 }
 
-func (cs *CacheStat) IncrementMiss() {
+// IncrementMiss increments the miss count.
-	atomic.AddUint64(&cs.Miss, 1)
+func (s *Stat) IncrementMiss() {
+	atomic.AddUint64(&s.Miss, 1)
 }
 
-func (cs *CacheStat) IncrementDbFails() {
+// IncrementDbFails increments the db fail count.
-	atomic.AddUint64(&cs.DbFails, 1)
+func (s *Stat) IncrementDbFails() {
+	atomic.AddUint64(&s.DbFails, 1)
 }
 
-func (cs *CacheStat) statLoop() {
+func (s *Stat) statLoop() {
 	ticker := time.NewTicker(statInterval)
 	defer ticker.Stop()
 
 	for range ticker.C {
-		total := atomic.SwapUint64(&cs.Total, 0)
+		total := atomic.SwapUint64(&s.Total, 0)
 		if total == 0 {
 			continue
 		}
 
-		hit := atomic.SwapUint64(&cs.Hit, 0)
+		hit := atomic.SwapUint64(&s.Hit, 0)
 		percent := 100 * float32(hit) / float32(total)
-		miss := atomic.SwapUint64(&cs.Miss, 0)
+		miss := atomic.SwapUint64(&s.Miss, 0)
-		dbf := atomic.SwapUint64(&cs.DbFails, 0)
+		dbf := atomic.SwapUint64(&s.DbFails, 0)
 		logx.Statf("dbcache(%s) - qpm: %d, hit_ratio: %.1f%%, hit: %d, miss: %d, db_fails: %d",
-			cs.name, total, percent, hit, miss, dbf)
+			s.name, total, percent, hit, miss, dbf)
 	}
 }

core/stores/cache/cleaner.go

@@ -39,6 +39,7 @@ func init() {
 	})
 }
 
+// AddCleanTask adds a clean task on given keys.
 func AddCleanTask(task func() error, keys ...string) {
 	timingWheel.SetTimer(stringx.Randn(taskKeyLen), delayTask{
 		delay: time.Second,

core/stores/cache/config.go

@@ -3,8 +3,10 @@ package cache
 import "github.com/tal-tech/go-zero/core/stores/redis"
 
 type (
+	// A ClusterConf is the config of a redis cluster that used as cache.
 	ClusterConf []NodeConf
 
+	// A NodeConf is the config of a redis node that used as cache.
 	NodeConf struct {
 		redis.RedisConf
 		Weight int `json:",default=100"`

core/stores/cache/util.go

@@ -4,6 +4,7 @@ import "strings"
 
 const keySeparator = ","
 
+// TotalWeights returns the total weights of given nodes.
 func TotalWeights(c []NodeConf) int {
 	var weights int
 

core/stores/clickhouse/clickhouse.go

@@ -8,6 +8,7 @@ import (
 
 const clickHouseDriverName = "clickhouse"
 
+// New returns a clickhouse connection.
 func New(datasource string, opts ...sqlx.SqlOption) sqlx.SqlConn {
 	return sqlx.NewSqlConn(clickHouseDriverName, datasource, opts...)
 }

core/stores/kv/config.go

@@ -1,7 +1,6 @@
 package kv
 
-import (
+import "github.com/tal-tech/go-zero/core/stores/cache"
-	"github.com/tal-tech/go-zero/core/stores/cache"
-)
 
+// KvConf is an alias of cache.ClusterConf.
 type KvConf = cache.ClusterConf

core/stores/kv/store.go

@@ -10,9 +10,11 @@ import (
 	"github.com/tal-tech/go-zero/core/stores/redis"
 )
 
+// ErrNoRedisNode is an error that indicates no redis node.
 var ErrNoRedisNode = errors.New("no redis node")
 
 type (
+	// Store interface represents a KV store.
 	Store interface {
 		Del(keys ...string) (int, error)
 		Eval(script string, key string, args ...interface{}) (interface{}, error)
@@ -81,6 +83,7 @@ type (
 	}
 )
 
+// NewStore returns a Store.
 func NewStore(c KvConf) Store {
 	if len(c) == 0 || cache.TotalWeights(c) <= 0 {
 		log.Fatal("no cache nodes")

core/stores/mongo/bulkinserter.go

@@ -14,14 +14,17 @@ const (
 )
 
 type (
+	// ResultHandler is a handler that used to handle results.
 	ResultHandler func(*mgo.BulkResult, error)
 
+	// A BulkInserter is used to insert bulk of mongo records.
 	BulkInserter struct {
 		executor *executors.PeriodicalExecutor
 		inserter *dbInserter
 	}
 )
 
+// NewBulkInserter returns a BulkInserter.
 func NewBulkInserter(session *mgo.Session, dbName string, collectionNamer func() string) *BulkInserter {
 	inserter := &dbInserter{
 		session:         session,
@@ -35,14 +38,17 @@ func NewBulkInserter(session *mgo.Session, dbName string, collectionNamer func()
 	}
 }
 
+// Flush flushes the inserter, writes all pending records.
 func (bi *BulkInserter) Flush() {
 	bi.executor.Flush()
 }
 
+// Insert inserts doc.
 func (bi *BulkInserter) Insert(doc interface{}) {
 	bi.executor.Add(doc)
 }
 
+// SetResultHandler sets the result handler.
 func (bi *BulkInserter) SetResultHandler(handler ResultHandler) {
 	bi.executor.Sync(func() {
 		bi.inserter.resultHandler = handler

core/stores/mongo/collection.go

@@ -13,9 +13,11 @@ import (
 
 const slowThreshold = time.Millisecond * 500
 
+// ErrNotFound is an alias of mgo.ErrNotFound.
 var ErrNotFound = mgo.ErrNotFound
 
 type (
+	// Collection interface represents a mongo connection.
 	Collection interface {
 		Find(query interface{}) Query
 		FindId(id interface{}) Query

core/stores/mongo/internal/collection.go

@@ -4,6 +4,7 @@ package internal
 
 import "github.com/globalsign/mgo"
 
+// MgoCollection interface represents a mgo collection.
 type MgoCollection interface {
 	Find(query interface{}) *mgo.Query
 	FindId(id interface{}) *mgo.Query

core/stores/mongo/iter.go

@@ -8,6 +8,7 @@ import (
 )
 
 type (
+	// Iter interface represents a mongo iter.
 	Iter interface {
 		All(result interface{}) error
 		Close() error
@@ -19,6 +20,7 @@ type (
 		Timeout() bool
 	}
 
+	// A ClosableIter is a closable mongo iter.
 	ClosableIter struct {
 		Iter
 		Cleanup func()
@@ -57,6 +59,7 @@ func (i promisedIter) For(result interface{}, f func() error) error {
 	return i.promise.keep(err)
 }
 
+// Close closes a mongo iter.
 func (it *ClosableIter) Close() error {
 	err := it.Iter.Close()
 	it.Cleanup()

core/stores/mongo/model.go

@@ -12,8 +12,10 @@ type (
 		timeout time.Duration
 	}
 
+	// Option defines the method to customize a mongo model.
 	Option func(opts *options)
 
+	// A Model is a mongo model.
 	Model struct {
 		session    *concurrentSession
 		db         *mgo.Database
@@ -22,6 +24,7 @@ type (
 	}
 )
 
+// MustNewModel returns a Model, exits on errors.
 func MustNewModel(url, collection string, opts ...Option) *Model {
 	model, err := NewModel(url, collection, opts...)
 	if err != nil {
@@ -31,6 +34,7 @@ func MustNewModel(url, collection string, opts ...Option) *Model {
 	return model
 }
 
+// NewModel returns a Model.
 func NewModel(url, collection string, opts ...Option) (*Model, error) {
 	session, err := getConcurrentSession(url)
 	if err != nil {
@@ -46,72 +50,85 @@ func NewModel(url, collection string, opts ...Option) (*Model, error) {
 	}, nil
 }
 
+// Find finds a record with given query.
 func (mm *Model) Find(query interface{}) (Query, error) {
 	return mm.query(func(c Collection) Query {
 		return c.Find(query)
 	})
 }
 
+// FindId finds a record with given id.
 func (mm *Model) FindId(id interface{}) (Query, error) {
 	return mm.query(func(c Collection) Query {
 		return c.FindId(id)
 	})
 }
 
+// GetCollection returns a Collection with given session.
 func (mm *Model) GetCollection(session *mgo.Session) Collection {
 	return newCollection(mm.db.C(mm.collection).With(session))
 }
 
+// Insert inserts docs into mm.
 func (mm *Model) Insert(docs ...interface{}) error {
 	return mm.execute(func(c Collection) error {
 		return c.Insert(docs...)
 	})
 }
 
+// Pipe returns a Pipe with given pipeline.
 func (mm *Model) Pipe(pipeline interface{}) (Pipe, error) {
 	return mm.pipe(func(c Collection) Pipe {
 		return c.Pipe(pipeline)
 	})
 }
 
+// PutSession returns the given session.
 func (mm *Model) PutSession(session *mgo.Session) {
 	mm.session.putSession(session)
 }
 
+// Remove removes the records with given selector.
 func (mm *Model) Remove(selector interface{}) error {
 	return mm.execute(func(c Collection) error {
 		return c.Remove(selector)
 	})
 }
 
+// RemoveAll removes all with given selector and returns a mgo.ChangeInfo.
 func (mm *Model) RemoveAll(selector interface{}) (*mgo.ChangeInfo, error) {
 	return mm.change(func(c Collection) (*mgo.ChangeInfo, error) {
 		return c.RemoveAll(selector)
 	})
 }
 
+// RemoveId removes a record with given id.
 func (mm *Model) RemoveId(id interface{}) error {
 	return mm.execute(func(c Collection) error {
 		return c.RemoveId(id)
 	})
 }
 
+// TakeSession gets a session.
 func (mm *Model) TakeSession() (*mgo.Session, error) {
 	return mm.session.takeSession(mm.opts...)
 }
 
+// Update updates a record with given selector.
 func (mm *Model) Update(selector, update interface{}) error {
 	return mm.execute(func(c Collection) error {
 		return c.Update(selector, update)
 	})
 }
 
+// UpdateId updates a record with given id.
 func (mm *Model) UpdateId(id, update interface{}) error {
 	return mm.execute(func(c Collection) error {
 		return c.UpdateId(id, update)
 	})
 }
 
+// Upsert upserts a record with given selector, and returns a mgo.ChangeInfo.
 func (mm *Model) Upsert(selector, update interface{}) (*mgo.ChangeInfo, error) {
 	return mm.change(func(c Collection) (*mgo.ChangeInfo, error) {
 		return c.Upsert(selector, update)
@@ -158,6 +175,7 @@ func (mm *Model) query(fn func(c Collection) Query) (Query, error) {
 	return fn(mm.GetCollection(session)), nil
 }
 
+// WithTimeout customizes an operation with given timeout.
 func WithTimeout(timeout time.Duration) Option {
 	return func(opts *options) {
 		opts.timeout = timeout

core/stores/mongo/pipe.go

@@ -8,6 +8,7 @@ import (
 )
 
 type (
+	// Pipe interface represents a mongo pipe.
 	Pipe interface {
 		All(result interface{}) error
 		AllowDiskUse() Pipe

core/stores/mongo/query.go

@@ -8,6 +8,7 @@ import (
 )
 
 type (
+	// Query interface represents a mongo query.
 	Query interface {
 		All(result interface{}) error
 		Apply(change mgo.Change, result interface{}) (*mgo.ChangeInfo, error)

core/stores/mongo/util.go

@@ -4,6 +4,7 @@ import "strings"
 
 const mongoAddrSep = ","
 
+// FormatAddr formats mongo hosts to a string.
 func FormatAddr(hosts []string) string {
 	return strings.Join(hosts, mongoAddrSep)
 }

core/stores/mongoc/cachedcollection.go

@@ -8,23 +8,52 @@ import (
 )
 
 var (
+	// ErrNotFound is an alias of mgo.ErrNotFound.
 	ErrNotFound = mgo.ErrNotFound
 
 	// can't use one SharedCalls per conn, because multiple conns may share the same cache key.
 	sharedCalls = syncx.NewSharedCalls()
-	stats       = cache.NewCacheStat("mongoc")
+	stats       = cache.NewStat("mongoc")
 )
 
 type (
+	// QueryOption defines the method to customize a mongo query.
 	QueryOption func(query mongo.Query) mongo.Query
 
+	// CachedCollection interface represents a mongo collection with cache.
+	CachedCollection interface {
+		Count(query interface{}) (int, error)
+		DelCache(keys ...string) error
+		FindAllNoCache(v interface{}, query interface{}, opts ...QueryOption) error
+		FindOne(v interface{}, key string, query interface{}) error
+		FindOneNoCache(v interface{}, query interface{}) error
+		FindOneId(v interface{}, key string, id interface{}) error
+		FindOneIdNoCache(v interface{}, id interface{}) error
+		GetCache(key string, v interface{}) error
+		Insert(docs ...interface{}) error
+		Pipe(pipeline interface{}) mongo.Pipe
+		Remove(selector interface{}, keys ...string) error
+		RemoveNoCache(selector interface{}) error
+		RemoveAll(selector interface{}, keys ...string) (*mgo.ChangeInfo, error)
+		RemoveAllNoCache(selector interface{}) (*mgo.ChangeInfo, error)
+		RemoveId(id interface{}, keys ...string) error
+		RemoveIdNoCache(id interface{}) error
+		SetCache(key string, v interface{}) error
+		Update(selector, update interface{}, keys ...string) error
+		UpdateNoCache(selector, update interface{}) error
+		UpdateId(id, update interface{}, keys ...string) error
+		UpdateIdNoCache(id, update interface{}) error
+		Upsert(selector, update interface{}, keys ...string) (*mgo.ChangeInfo, error)
+		UpsertNoCache(selector, update interface{}) (*mgo.ChangeInfo, error)
+	}
+
 	cachedCollection struct {
 		collection mongo.Collection
 		cache      cache.Cache
 	}
 )
 
-func newCollection(collection mongo.Collection, c cache.Cache) *cachedCollection {
+func newCollection(collection mongo.Collection, c cache.Cache) CachedCollection {
 	return &cachedCollection{
 		collection: collection,
 		cache:      c,
@@ -39,10 +68,6 @@ func (c *cachedCollection) DelCache(keys ...string) error {
 	return c.cache.Del(keys...)
 }
 
-func (c *cachedCollection) GetCache(key string, v interface{}) error {
-	return c.cache.Get(key, v)
-}
-
 func (c *cachedCollection) FindAllNoCache(v interface{}, query interface{}, opts ...QueryOption) error {
 	q := c.collection.Find(query)
 	for _, opt := range opts {
@@ -75,6 +100,10 @@ func (c *cachedCollection) FindOneIdNoCache(v interface{}, id interface{}) error
 	return q.One(v)
 }
 
+func (c *cachedCollection) GetCache(key string, v interface{}) error {
+	return c.cache.Get(key, v)
+}
+
 func (c *cachedCollection) Insert(docs ...interface{}) error {
 	return c.collection.Insert(docs...)
 }

core/stores/mongoc/cachedmodel.go

@@ -9,12 +9,14 @@ import (
 	"github.com/tal-tech/go-zero/core/stores/redis"
 )
 
+// A Model is a mongo model that built with cache capability.
 type Model struct {
 	*mongo.Model
 	cache              cache.Cache
-	generateCollection func(*mgo.Session) *cachedCollection
+	generateCollection func(*mgo.Session) CachedCollection
 }
 
+// MustNewNodeModel returns a Model with a cache node, exists on errors.
 func MustNewNodeModel(url, collection string, rds *redis.Redis, opts ...cache.Option) *Model {
 	model, err := NewNodeModel(url, collection, rds, opts...)
 	if err != nil {
@@ -24,6 +26,7 @@ func MustNewNodeModel(url, collection string, rds *redis.Redis, opts ...cache.Op
 	return model
 }
 
+// MustNewModel returns a Model with a cache cluster, exists on errors.
 func MustNewModel(url, collection string, c cache.CacheConf, opts ...cache.Option) *Model {
 	model, err := NewModel(url, collection, c, opts...)
 	if err != nil {
@@ -33,157 +36,183 @@ func MustNewModel(url, collection string, c cache.CacheConf, opts ...cache.Optio
 	return model
 }
 
+// NewNodeModel returns a Model with a cache node.
 func NewNodeModel(url, collection string, rds *redis.Redis, opts ...cache.Option) (*Model, error) {
 	c := cache.NewNode(rds, sharedCalls, stats, mgo.ErrNotFound, opts...)
-	return createModel(url, collection, c, func(collection mongo.Collection) *cachedCollection {
+	return createModel(url, collection, c, func(collection mongo.Collection) CachedCollection {
 		return newCollection(collection, c)
 	})
 }
 
+// NewModel returns a Model with a cache cluster.
 func NewModel(url, collection string, conf cache.CacheConf, opts ...cache.Option) (*Model, error) {
 	c := cache.New(conf, sharedCalls, stats, mgo.ErrNotFound, opts...)
-	return createModel(url, collection, c, func(collection mongo.Collection) *cachedCollection {
+	return createModel(url, collection, c, func(collection mongo.Collection) CachedCollection {
 		return newCollection(collection, c)
 	})
 }
 
+// Count returns the count of given query.
 func (mm *Model) Count(query interface{}) (int, error) {
-	return mm.executeInt(func(c *cachedCollection) (int, error) {
+	return mm.executeInt(func(c CachedCollection) (int, error) {
 		return c.Count(query)
 	})
 }
 
+// DelCache deletes the cache with given keys.
 func (mm *Model) DelCache(keys ...string) error {
 	return mm.cache.Del(keys...)
 }
 
+// GetCache unmarshal the cache into v with given key.
 func (mm *Model) GetCache(key string, v interface{}) error {
 	return mm.cache.Get(key, v)
 }
 
-func (mm *Model) GetCollection(session *mgo.Session) *cachedCollection {
+// GetCollection returns a cache collection.
+func (mm *Model) GetCollection(session *mgo.Session) CachedCollection {
 	return mm.generateCollection(session)
 }
 
+// FindAllNoCache finds all records without cache.
 func (mm *Model) FindAllNoCache(v interface{}, query interface{}, opts ...QueryOption) error {
-	return mm.execute(func(c *cachedCollection) error {
+	return mm.execute(func(c CachedCollection) error {
 		return c.FindAllNoCache(v, query, opts...)
 	})
 }
 
+// FindOne unmarshals a record into v with given key and query.
 func (mm *Model) FindOne(v interface{}, key string, query interface{}) error {
-	return mm.execute(func(c *cachedCollection) error {
+	return mm.execute(func(c CachedCollection) error {
 		return c.FindOne(v, key, query)
 	})
 }
 
+// FindOneNoCache unmarshals a record into v with query, without cache.
 func (mm *Model) FindOneNoCache(v interface{}, query interface{}) error {
-	return mm.execute(func(c *cachedCollection) error {
+	return mm.execute(func(c CachedCollection) error {
 		return c.FindOneNoCache(v, query)
 	})
 }
 
+// FindOneId unmarshals a record into v with query.
 func (mm *Model) FindOneId(v interface{}, key string, id interface{}) error {
-	return mm.execute(func(c *cachedCollection) error {
+	return mm.execute(func(c CachedCollection) error {
 		return c.FindOneId(v, key, id)
 	})
 }
 
+// FindOneIdNoCache unmarshals a record into v with query, without cache.
 func (mm *Model) FindOneIdNoCache(v interface{}, id interface{}) error {
-	return mm.execute(func(c *cachedCollection) error {
+	return mm.execute(func(c CachedCollection) error {
 		return c.FindOneIdNoCache(v, id)
 	})
 }
 
+// Insert inserts docs.
 func (mm *Model) Insert(docs ...interface{}) error {
-	return mm.execute(func(c *cachedCollection) error {
+	return mm.execute(func(c CachedCollection) error {
 		return c.Insert(docs...)
 	})
 }
 
+// Pipe returns a mongo pipe with given pipeline.
 func (mm *Model) Pipe(pipeline interface{}) (mongo.Pipe, error) {
-	return mm.pipe(func(c *cachedCollection) mongo.Pipe {
+	return mm.pipe(func(c CachedCollection) mongo.Pipe {
 		return c.Pipe(pipeline)
 	})
 }
 
+// Remove removes a record with given selector, and remove it from cache with given keys.
 func (mm *Model) Remove(selector interface{}, keys ...string) error {
-	return mm.execute(func(c *cachedCollection) error {
+	return mm.execute(func(c CachedCollection) error {
 		return c.Remove(selector, keys...)
 	})
 }
 
+// RemoveNoCache removes a record with given selector.
 func (mm *Model) RemoveNoCache(selector interface{}) error {
-	return mm.execute(func(c *cachedCollection) error {
+	return mm.execute(func(c CachedCollection) error {
 		return c.RemoveNoCache(selector)
 	})
 }
 
+// RemoveAll removes all records with given selector, and removes cache with given keys.
 func (mm *Model) RemoveAll(selector interface{}, keys ...string) (*mgo.ChangeInfo, error) {
-	return mm.change(func(c *cachedCollection) (*mgo.ChangeInfo, error) {
+	return mm.change(func(c CachedCollection) (*mgo.ChangeInfo, error) {
 		return c.RemoveAll(selector, keys...)
 	})
 }
 
+// RemoveAllNoCache removes all records with given selector, and returns a mgo.ChangeInfo.
 func (mm *Model) RemoveAllNoCache(selector interface{}) (*mgo.ChangeInfo, error) {
-	return mm.change(func(c *cachedCollection) (*mgo.ChangeInfo, error) {
+	return mm.change(func(c CachedCollection) (*mgo.ChangeInfo, error) {
 		return c.RemoveAllNoCache(selector)
 	})
 }
 
+// RemoveId removes a record with given id, and removes cache with given keys.
 func (mm *Model) RemoveId(id interface{}, keys ...string) error {
-	return mm.execute(func(c *cachedCollection) error {
+	return mm.execute(func(c CachedCollection) error {
 		return c.RemoveId(id, keys...)
 	})
 }
 
+// RemoveIdNoCache removes a record with given id.
 func (mm *Model) RemoveIdNoCache(id interface{}) error {
-	return mm.execute(func(c *cachedCollection) error {
+	return mm.execute(func(c CachedCollection) error {
 		return c.RemoveIdNoCache(id)
 	})
 }
 
+// SetCache sets the cache with given key and value.
 func (mm *Model) SetCache(key string, v interface{}) error {
 	return mm.cache.Set(key, v)
 }
 
+// Update updates the record with given selector, and delete cache with given keys.
 func (mm *Model) Update(selector, update interface{}, keys ...string) error {
-	return mm.execute(func(c *cachedCollection) error {
+	return mm.execute(func(c CachedCollection) error {
 		return c.Update(selector, update, keys...)
 	})
 }
 
+// UpdateNoCache updates the record with given selector.
 func (mm *Model) UpdateNoCache(selector, update interface{}) error {
-	return mm.execute(func(c *cachedCollection) error {
+	return mm.execute(func(c CachedCollection) error {
 		return c.UpdateNoCache(selector, update)
 	})
 }
 
+// UpdateId updates the record with given id, and delete cache with given keys.
 func (mm *Model) UpdateId(id, update interface{}, keys ...string) error {
-	return mm.execute(func(c *cachedCollection) error {
+	return mm.execute(func(c CachedCollection) error {
 		return c.UpdateId(id, update, keys...)
 	})
 }
 
+// UpdateIdNoCache updates the record with given id.
 func (mm *Model) UpdateIdNoCache(id, update interface{}) error {
-	return mm.execute(func(c *cachedCollection) error {
+	return mm.execute(func(c CachedCollection) error {
 		return c.UpdateIdNoCache(id, update)
 	})
 }
 
+// Upsert upserts a record with given selector, and delete cache with given keys.
 func (mm *Model) Upsert(selector, update interface{}, keys ...string) (*mgo.ChangeInfo, error) {
-	return mm.change(func(c *cachedCollection) (*mgo.ChangeInfo, error) {
+	return mm.change(func(c CachedCollection) (*mgo.ChangeInfo, error) {
 		return c.Upsert(selector, update, keys...)
 	})
 }
 
+// UpsertNoCache upserts a record with given selector.
 func (mm *Model) UpsertNoCache(selector, update interface{}) (*mgo.ChangeInfo, error) {
-	return mm.change(func(c *cachedCollection) (*mgo.ChangeInfo, error) {
+	return mm.change(func(c CachedCollection) (*mgo.ChangeInfo, error) {
 		return c.UpsertNoCache(selector, update)
 	})
 }
 
-func (mm *Model) change(fn func(c *cachedCollection) (*mgo.ChangeInfo, error)) (*mgo.ChangeInfo, error) {
+func (mm *Model) change(fn func(c CachedCollection) (*mgo.ChangeInfo, error)) (*mgo.ChangeInfo, error) {
 	session, err := mm.TakeSession()
 	if err != nil {
 		return nil, err
@@ -193,7 +222,7 @@ func (mm *Model) change(fn func(c *cachedCollection) (*mgo.ChangeInfo, error)) (
 	return fn(mm.GetCollection(session))
 }
 
-func (mm *Model) execute(fn func(c *cachedCollection) error) error {
+func (mm *Model) execute(fn func(c CachedCollection) error) error {
 	session, err := mm.TakeSession()
 	if err != nil {
 		return err
@@ -203,7 +232,7 @@ func (mm *Model) execute(fn func(c *cachedCollection) error) error {
 	return fn(mm.GetCollection(session))
 }
 
-func (mm *Model) executeInt(fn func(c *cachedCollection) (int, error)) (int, error) {
+func (mm *Model) executeInt(fn func(c CachedCollection) (int, error)) (int, error) {
 	session, err := mm.TakeSession()
 	if err != nil {
 		return 0, err
@@ -213,7 +242,7 @@ func (mm *Model) executeInt(fn func(c *cachedCollection) (int, error)) (int, err
 	return fn(mm.GetCollection(session))
 }
 
-func (mm *Model) pipe(fn func(c *cachedCollection) mongo.Pipe) (mongo.Pipe, error) {
+func (mm *Model) pipe(fn func(c CachedCollection) mongo.Pipe) (mongo.Pipe, error) {
 	session, err := mm.TakeSession()
 	if err != nil {
 		return nil, err
@@ -224,7 +253,7 @@ func (mm *Model) pipe(fn func(c *cachedCollection) mongo.Pipe) (mongo.Pipe, erro
 }
 
 func createModel(url, collection string, c cache.Cache,
-	create func(mongo.Collection) *cachedCollection) (*Model, error) {
+	create func(mongo.Collection) CachedCollection) (*Model, error) {
 	model, err := mongo.NewModel(url, collection)
 	if err != nil {
 		return nil, err
@@ -233,7 +262,7 @@ func createModel(url, collection string, c cache.Cache,
 	return &Model{
 		Model: model,
 		cache: c,
-		generateCollection: func(session *mgo.Session) *cachedCollection {
+		generateCollection: func(session *mgo.Session) CachedCollection {
 			collection := model.GetCollection(session)
 			return create(collection)
 		},

core/stores/postgres/postgresql.go

@@ -8,6 +8,7 @@ import (
 
 const postgresDriverName = "postgres"
 
+// New returns a postgres connection.
 func New(datasource string, opts ...sqlx.SqlOption) sqlx.SqlConn {
 	return sqlx.NewSqlConn(postgresDriverName, datasource, opts...)
 }

core/stores/redis/conf.go

@@ -3,28 +3,35 @@ package redis
 import "errors"
 
 var (
+	// ErrEmptyHost is an error that indicates no redis host is set.
 	ErrEmptyHost = errors.New("empty redis host")
+	// ErrEmptyType is an error that indicates no redis type is set.
 	ErrEmptyType = errors.New("empty redis type")
-	ErrEmptyKey  = errors.New("empty redis key")
+	// ErrEmptyKey is an error that indicates no redis key is set.
+	ErrEmptyKey = errors.New("empty redis key")
 )
 
 type (
+	// A RedisConf is a redis config.
 	RedisConf struct {
 		Host string
 		Type string `json:",default=node,options=node|cluster"`
 		Pass string `json:",optional"`
 	}
 
+	// A RedisKeyConf is a redis config with key.
 	RedisKeyConf struct {
 		RedisConf
 		Key string `json:",optional"`
 	}
 )
 
+// NewRedis returns a Redis.
 func (rc RedisConf) NewRedis() *Redis {
 	return NewRedis(rc.Host, rc.Type, rc.Pass)
 }
 
+// Validate validates the RedisConf.
 func (rc RedisConf) Validate() error {
 	if len(rc.Host) == 0 {
 		return ErrEmptyHost
@@ -37,6 +44,7 @@ func (rc RedisConf) Validate() error {
 	return nil
 }
 
+// Validate validates the RedisKeyConf.
 func (rkc RedisKeyConf) Validate() error {
 	if err := rkc.RedisConf.Validate(); err != nil {
 		return err

core/stores/redis/redis.go

@@ -12,9 +12,12 @@ import (
 )
 
 const (
+	// ClusterType means redis cluster.
 	ClusterType = "cluster"
-	NodeType    = "node"
+	// NodeType means redis node.
-	Nil         = red.Nil
+	NodeType = "node"
+	// Nil is an alias of redis.Nil.
+	Nil = red.Nil
 
 	blockingQueryTimeout = 5 * time.Second
 	readWriteTimeout     = 2 * time.Second
@@ -22,9 +25,11 @@ const (
 	slowThreshold = time.Millisecond * 100
 )
 
+// ErrNilNode is an error that indicates a nil redis node.
 var ErrNilNode = errors.New("nil redis node")
 
 type (
+	// A Pair is a key/pair set used in redis zset.
 	Pair struct {
 		Key   string
 		Score int64
@@ -38,6 +43,7 @@ type (
 		brk  breaker.Breaker
 	}
 
+	// RedisNode interface represents a redis node.
 	RedisNode interface {
 		red.Cmdable
 	}
@@ -46,18 +52,24 @@ type (
 	GeoLocation = red.GeoLocation
 	// GeoRadiusQuery is used with GeoRadius to query geospatial index.
 	GeoRadiusQuery = red.GeoRadiusQuery
-	GeoPos         = red.GeoPos
+	// GeoPos is used to represent a geo position.
+	GeoPos = red.GeoPos
 
+	// Pipeliner is an alias of redis.Pipeliner.
 	Pipeliner = red.Pipeliner
 
 	// Z represents sorted set member.
-	Z      = red.Z
+	Z = red.Z
+	// ZStore is an alias of redis.ZStore.
 	ZStore = red.ZStore
 
-	IntCmd   = red.IntCmd
+	// IntCmd is an alias of redis.IntCmd.
+	IntCmd = red.IntCmd
+	// FloatCmd is an alias of redis.FloatCmd.
 	FloatCmd = red.FloatCmd
 )
 
+// NewRedis returns a Redis.
 func NewRedis(redisAddr, redisType string, redisPass ...string) *Redis {
 	var pass string
 	for _, v := range redisPass {
@@ -184,6 +196,8 @@ func (s *Redis) Blpop(redisNode RedisNode, key string) (string, error) {
 	return vals[1], nil
 }
 
+// BlpopEx uses passed in redis connection to execute blpop command.
+// The difference against Blpop is that this method returns a bool to indicate success.
 func (s *Redis) BlpopEx(redisNode RedisNode, key string) (string, bool, error) {
 	if redisNode == nil {
 		return "", false, ErrNilNode
@@ -201,6 +215,7 @@ func (s *Redis) BlpopEx(redisNode RedisNode, key string) (string, bool, error) {
 	return vals[1], true, nil
 }
 
+// Del deletes keys.
 func (s *Redis) Del(keys ...string) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -220,6 +235,7 @@ func (s *Redis) Del(keys ...string) (val int, err error) {
 	return
 }
 
+// Eval is the implementation of redis eval command.
 func (s *Redis) Eval(script string, keys []string, args ...interface{}) (val interface{}, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -234,6 +250,7 @@ func (s *Redis) Eval(script string, keys []string, args ...interface{}) (val int
 	return
 }
 
+// Exists is the implementation of redis exists command.
 func (s *Redis) Exists(key string) (val bool, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -253,6 +270,7 @@ func (s *Redis) Exists(key string) (val bool, err error) {
 	return
 }
 
+// Expire is the implementation of redis expire command.
 func (s *Redis) Expire(key string, seconds int) error {
 	return s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -264,6 +282,7 @@ func (s *Redis) Expire(key string, seconds int) error {
 	}, acceptable)
 }
 
+// Expireat is the implementation of redis expireat command.
 func (s *Redis) Expireat(key string, expireTime int64) error {
 	return s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -275,6 +294,7 @@ func (s *Redis) Expireat(key string, expireTime int64) error {
 	}, acceptable)
 }
 
+// GeoAdd is the implementation of redis geoadd command.
 func (s *Redis) GeoAdd(key string, geoLocation ...*GeoLocation) (val int64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -293,6 +313,7 @@ func (s *Redis) GeoAdd(key string, geoLocation ...*GeoLocation) (val int64, err
 	return
 }
 
+// GeoDist is the implementation of redis geodist command.
 func (s *Redis) GeoDist(key string, member1, member2, unit string) (val float64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -311,6 +332,7 @@ func (s *Redis) GeoDist(key string, member1, member2, unit string) (val float64,
 	return
 }
 
+// GeoHash is the implementation of redis geohash command.
 func (s *Redis) GeoHash(key string, members ...string) (val []string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -329,6 +351,7 @@ func (s *Redis) GeoHash(key string, members ...string) (val []string, err error)
 	return
 }
 
+// GeoRadius is the implementation of redis georadius command.
 func (s *Redis) GeoRadius(key string, longitude, latitude float64, query *GeoRadiusQuery) (val []GeoLocation, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -346,6 +369,8 @@ func (s *Redis) GeoRadius(key string, longitude, latitude float64, query *GeoRad
 	}, acceptable)
 	return
 }
+
+// GeoRadiusByMember is the implementation of redis georadiusbymember command.
 func (s *Redis) GeoRadiusByMember(key, member string, query *GeoRadiusQuery) (val []GeoLocation, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -364,6 +389,7 @@ func (s *Redis) GeoRadiusByMember(key, member string, query *GeoRadiusQuery) (va
 	return
 }
 
+// GeoPos is the implementation of redis geopos command.
 func (s *Redis) GeoPos(key string, members ...string) (val []*GeoPos, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -382,6 +408,7 @@ func (s *Redis) GeoPos(key string, members ...string) (val []*GeoPos, err error)
 	return
 }
 
+// Get is the implementation of redis get command.
 func (s *Redis) Get(key string) (val string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -401,6 +428,7 @@ func (s *Redis) Get(key string) (val string, err error) {
 	return
 }
 
+// GetBit is the implementation of redis getbit command.
 func (s *Redis) GetBit(key string, offset int64) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -420,6 +448,7 @@ func (s *Redis) GetBit(key string, offset int64) (val int, err error) {
 	return
 }
 
+// Hdel is the implementation of redis hdel command.
 func (s *Redis) Hdel(key, field string) (val bool, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -439,6 +468,7 @@ func (s *Redis) Hdel(key, field string) (val bool, err error) {
 	return
 }
 
+// Hexists is the implementation of redis hexists command.
 func (s *Redis) Hexists(key, field string) (val bool, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -453,6 +483,7 @@ func (s *Redis) Hexists(key, field string) (val bool, err error) {
 	return
 }
 
+// Hget is the implementation of redis hget command.
 func (s *Redis) Hget(key, field string) (val string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -467,6 +498,7 @@ func (s *Redis) Hget(key, field string) (val string, err error) {
 	return
 }
 
+// Hgetall is the implementation of redis hgetall command.
 func (s *Redis) Hgetall(key string) (val map[string]string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -481,6 +513,7 @@ func (s *Redis) Hgetall(key string) (val map[string]string, err error) {
 	return
 }
 
+// Hincrby is the implementation of redis hincrby command.
 func (s *Redis) Hincrby(key, field string, increment int) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -500,6 +533,7 @@ func (s *Redis) Hincrby(key, field string, increment int) (val int, err error) {
 	return
 }
 
+// Hkeys is the implementation of redis hkeys command.
 func (s *Redis) Hkeys(key string) (val []string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -514,6 +548,7 @@ func (s *Redis) Hkeys(key string) (val []string, err error) {
 	return
 }
 
+// Hlen is the implementation of redis hlen command.
 func (s *Redis) Hlen(key string) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -533,6 +568,7 @@ func (s *Redis) Hlen(key string) (val int, err error) {
 	return
 }
 
+// Hmget is the implementation of redis hmget command.
 func (s *Redis) Hmget(key string, fields ...string) (val []string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -552,6 +588,7 @@ func (s *Redis) Hmget(key string, fields ...string) (val []string, err error) {
 	return
 }
 
+// Hset is the implementation of redis hset command.
 func (s *Redis) Hset(key, field, value string) error {
 	return s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -563,6 +600,7 @@ func (s *Redis) Hset(key, field, value string) error {
 	}, acceptable)
 }
 
+// Hsetnx is the implementation of redis hsetnx command.
 func (s *Redis) Hsetnx(key, field, value string) (val bool, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -577,6 +615,7 @@ func (s *Redis) Hsetnx(key, field, value string) (val bool, err error) {
 	return
 }
 
+// Hmset is the implementation of redis hmset command.
 func (s *Redis) Hmset(key string, fieldsAndValues map[string]string) error {
 	return s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -593,6 +632,7 @@ func (s *Redis) Hmset(key string, fieldsAndValues map[string]string) error {
 	}, acceptable)
 }
 
+// Hscan is the implementation of redis hscan command.
 func (s *Redis) Hscan(key string, cursor uint64, match string, count int64) (keys []string, cur uint64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -607,6 +647,7 @@ func (s *Redis) Hscan(key string, cursor uint64, match string, count int64) (key
 	return
 }
 
+// Hvals is the implementation of redis hvals command.
 func (s *Redis) Hvals(key string) (val []string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -621,6 +662,7 @@ func (s *Redis) Hvals(key string) (val []string, err error) {
 	return
 }
 
+// Incr is the implementation of redis incr command.
 func (s *Redis) Incr(key string) (val int64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -635,6 +677,7 @@ func (s *Redis) Incr(key string) (val int64, err error) {
 	return
 }
 
+// Incrby is the implementation of redis incrby command.
 func (s *Redis) Incrby(key string, increment int64) (val int64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -649,6 +692,7 @@ func (s *Redis) Incrby(key string, increment int64) (val int64, err error) {
 	return
 }
 
+// Keys is the implementation of redis keys command.
 func (s *Redis) Keys(pattern string) (val []string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -663,6 +707,7 @@ func (s *Redis) Keys(pattern string) (val []string, err error) {
 	return
 }
 
+// Llen is the implementation of redis llen command.
 func (s *Redis) Llen(key string) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -682,6 +727,7 @@ func (s *Redis) Llen(key string) (val int, err error) {
 	return
 }
 
+// Lpop is the implementation of redis lpop command.
 func (s *Redis) Lpop(key string) (val string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -696,6 +742,7 @@ func (s *Redis) Lpop(key string) (val string, err error) {
 	return
 }
 
+// Lpush is the implementation of redis lpush command.
 func (s *Redis) Lpush(key string, values ...interface{}) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -715,6 +762,7 @@ func (s *Redis) Lpush(key string, values ...interface{}) (val int, err error) {
 	return
 }
 
+// Lrange is the implementation of redis lrange command.
 func (s *Redis) Lrange(key string, start int, stop int) (val []string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -729,6 +777,7 @@ func (s *Redis) Lrange(key string, start int, stop int) (val []string, err error
 	return
 }
 
+// Lrem is the implementation of redis lrem command.
 func (s *Redis) Lrem(key string, count int, value string) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -748,6 +797,7 @@ func (s *Redis) Lrem(key string, count int, value string) (val int, err error) {
 	return
 }
 
+// Mget is the implementation of redis mget command.
 func (s *Redis) Mget(keys ...string) (val []string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -767,6 +817,7 @@ func (s *Redis) Mget(keys ...string) (val []string, err error) {
 	return
 }
 
+// Persist is the implementation of redis persist command.
 func (s *Redis) Persist(key string) (val bool, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -781,6 +832,7 @@ func (s *Redis) Persist(key string) (val bool, err error) {
 	return
 }
 
+// Pfadd is the implementation of redis pfadd command.
 func (s *Redis) Pfadd(key string, values ...interface{}) (val bool, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -800,6 +852,7 @@ func (s *Redis) Pfadd(key string, values ...interface{}) (val bool, err error) {
 	return
 }
 
+// Pfcount is the implementation of redis pfcount command.
 func (s *Redis) Pfcount(key string) (val int64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -814,6 +867,7 @@ func (s *Redis) Pfcount(key string) (val int64, err error) {
 	return
 }
 
+// Pfmerge is the implementation of redis pfmerge command.
 func (s *Redis) Pfmerge(dest string, keys ...string) error {
 	return s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -826,6 +880,7 @@ func (s *Redis) Pfmerge(dest string, keys ...string) error {
 	}, acceptable)
 }
 
+// Ping is the implementation of redis ping command.
 func (s *Redis) Ping() (val bool) {
 	// ignore error, error means false
 	_ = s.brk.DoWithAcceptable(func() error {
@@ -848,6 +903,7 @@ func (s *Redis) Ping() (val bool) {
 	return
 }
 
+// Pipelined lets fn to execute pipelined commands.
 func (s *Redis) Pipelined(fn func(Pipeliner) error) (err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -863,6 +919,7 @@ func (s *Redis) Pipelined(fn func(Pipeliner) error) (err error) {
 	return
 }
 
+// Rpop is the implementation of redis rpop command.
 func (s *Redis) Rpop(key string) (val string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -877,6 +934,7 @@ func (s *Redis) Rpop(key string) (val string, err error) {
 	return
 }
 
+// Rpush is the implementation of redis rpush command.
 func (s *Redis) Rpush(key string, values ...interface{}) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -896,6 +954,7 @@ func (s *Redis) Rpush(key string, values ...interface{}) (val int, err error) {
 	return
 }
 
+// Sadd is the implementation of redis sadd command.
 func (s *Redis) Sadd(key string, values ...interface{}) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -915,6 +974,7 @@ func (s *Redis) Sadd(key string, values ...interface{}) (val int, err error) {
 	return
 }
 
+// Scan is the implementation of redis scan command.
 func (s *Redis) Scan(cursor uint64, match string, count int64) (keys []string, cur uint64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -929,6 +989,7 @@ func (s *Redis) Scan(cursor uint64, match string, count int64) (keys []string, c
 	return
 }
 
+// SetBit is the implementation of redis setbit command.
 func (s *Redis) SetBit(key string, offset int64, value int) error {
 	return s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -941,6 +1002,7 @@ func (s *Redis) SetBit(key string, offset int64, value int) error {
 	}, acceptable)
 }
 
+// Sscan is the implementation of redis sscan command.
 func (s *Redis) Sscan(key string, cursor uint64, match string, count int64) (keys []string, cur uint64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -955,6 +1017,7 @@ func (s *Redis) Sscan(key string, cursor uint64, match string, count int64) (key
 	return
 }
 
+// Scard is the implementation of redis scard command.
 func (s *Redis) Scard(key string) (val int64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -969,6 +1032,7 @@ func (s *Redis) Scard(key string) (val int64, err error) {
 	return
 }
 
+// Set is the implementation of redis set command.
 func (s *Redis) Set(key string, value string) error {
 	return s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -980,6 +1044,7 @@ func (s *Redis) Set(key string, value string) error {
 	}, acceptable)
 }
 
+// Setex is the implementation of redis setex command.
 func (s *Redis) Setex(key, value string, seconds int) error {
 	return s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -991,6 +1056,7 @@ func (s *Redis) Setex(key, value string, seconds int) error {
 	}, acceptable)
 }
 
+// Setnx is the implementation of redis setnx command.
 func (s *Redis) Setnx(key, value string) (val bool, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1005,6 +1071,7 @@ func (s *Redis) Setnx(key, value string) (val bool, err error) {
 	return
 }
 
+// SetnxEx is the implementation of redis setnx command with expire.
 func (s *Redis) SetnxEx(key, value string, seconds int) (val bool, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1019,6 +1086,7 @@ func (s *Redis) SetnxEx(key, value string, seconds int) (val bool, err error) {
 	return
 }
 
+// Sismember is the implementation of redis sismember command.
 func (s *Redis) Sismember(key string, value interface{}) (val bool, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1033,6 +1101,7 @@ func (s *Redis) Sismember(key string, value interface{}) (val bool, err error) {
 	return
 }
 
+// Srem is the implementation of redis srem command.
 func (s *Redis) Srem(key string, values ...interface{}) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1052,6 +1121,7 @@ func (s *Redis) Srem(key string, values ...interface{}) (val int, err error) {
 	return
 }
 
+// Smembers is the implementation of redis smembers command.
 func (s *Redis) Smembers(key string) (val []string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1066,6 +1136,7 @@ func (s *Redis) Smembers(key string) (val []string, err error) {
 	return
 }
 
+// Spop is the implementation of redis spop command.
 func (s *Redis) Spop(key string) (val string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1080,6 +1151,7 @@ func (s *Redis) Spop(key string) (val string, err error) {
 	return
 }
 
+// Srandmember is the implementation of redis srandmember command.
 func (s *Redis) Srandmember(key string, count int) (val []string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1094,6 +1166,7 @@ func (s *Redis) Srandmember(key string, count int) (val []string, err error) {
 	return
 }
 
+// Sunion is the implementation of redis sunion command.
 func (s *Redis) Sunion(keys ...string) (val []string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1108,6 +1181,7 @@ func (s *Redis) Sunion(keys ...string) (val []string, err error) {
 	return
 }
 
+// Sunionstore is the implementation of redis sunionstore command.
 func (s *Redis) Sunionstore(destination string, keys ...string) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1127,6 +1201,7 @@ func (s *Redis) Sunionstore(destination string, keys ...string) (val int, err er
 	return
 }
 
+// Sdiff is the implementation of redis sdiff command.
 func (s *Redis) Sdiff(keys ...string) (val []string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1141,6 +1216,7 @@ func (s *Redis) Sdiff(keys ...string) (val []string, err error) {
 	return
 }
 
+// Sdiffstore is the implementation of redis sdiffstore command.
 func (s *Redis) Sdiffstore(destination string, keys ...string) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1160,6 +1236,7 @@ func (s *Redis) Sdiffstore(destination string, keys ...string) (val int, err err
 	return
 }
 
+// Ttl is the implementation of redis ttl command.
 func (s *Redis) Ttl(key string) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1179,6 +1256,7 @@ func (s *Redis) Ttl(key string) (val int, err error) {
 	return
 }
 
+// Zadd is the implementation of redis zadd command.
 func (s *Redis) Zadd(key string, score int64, value string) (val bool, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1201,6 +1279,7 @@ func (s *Redis) Zadd(key string, score int64, value string) (val bool, err error
 	return
 }
 
+// Zadds is the implementation of redis zadds command.
 func (s *Redis) Zadds(key string, ps ...Pair) (val int64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1226,6 +1305,7 @@ func (s *Redis) Zadds(key string, ps ...Pair) (val int64, err error) {
 	return
 }
 
+// Zcard is the implementation of redis zcard command.
 func (s *Redis) Zcard(key string) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1245,6 +1325,7 @@ func (s *Redis) Zcard(key string) (val int, err error) {
 	return
 }
 
+// Zcount is the implementation of redis zcount command.
 func (s *Redis) Zcount(key string, start, stop int64) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1264,6 +1345,7 @@ func (s *Redis) Zcount(key string, start, stop int64) (val int, err error) {
 	return
 }
 
+// Zincrby is the implementation of redis zincrby command.
 func (s *Redis) Zincrby(key string, increment int64, field string) (val int64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1283,6 +1365,7 @@ func (s *Redis) Zincrby(key string, increment int64, field string) (val int64, e
 	return
 }
 
+// Zscore is the implementation of redis zscore command.
 func (s *Redis) Zscore(key string, value string) (val int64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1302,6 +1385,7 @@ func (s *Redis) Zscore(key string, value string) (val int64, err error) {
 	return
 }
 
+// Zrank is the implementation of redis zrank command.
 func (s *Redis) Zrank(key, field string) (val int64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1316,6 +1400,7 @@ func (s *Redis) Zrank(key, field string) (val int64, err error) {
 	return
 }
 
+// Zrem is the implementation of redis zrem command.
 func (s *Redis) Zrem(key string, values ...interface{}) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1335,6 +1420,7 @@ func (s *Redis) Zrem(key string, values ...interface{}) (val int, err error) {
 	return
 }
 
+// Zremrangebyscore is the implementation of redis zremrangebyscore command.
 func (s *Redis) Zremrangebyscore(key string, start, stop int64) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1355,6 +1441,7 @@ func (s *Redis) Zremrangebyscore(key string, start, stop int64) (val int, err er
 	return
 }
 
+// Zremrangebyrank is the implementation of redis zremrangebyrank command.
 func (s *Redis) Zremrangebyrank(key string, start, stop int64) (val int, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1374,6 +1461,7 @@ func (s *Redis) Zremrangebyrank(key string, start, stop int64) (val int, err err
 	return
 }
 
+// Zrange is the implementation of redis zrange command.
 func (s *Redis) Zrange(key string, start, stop int64) (val []string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1388,6 +1476,7 @@ func (s *Redis) Zrange(key string, start, stop int64) (val []string, err error)
 	return
 }
 
+// ZrangeWithScores is the implementation of redis zrange command with scores.
 func (s *Redis) ZrangeWithScores(key string, start, stop int64) (val []Pair, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1407,6 +1496,7 @@ func (s *Redis) ZrangeWithScores(key string, start, stop int64) (val []Pair, err
 	return
 }
 
+// ZRevRangeWithScores is the implementation of redis zrevrange command with scores.
 func (s *Redis) ZRevRangeWithScores(key string, start, stop int64) (val []Pair, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1426,6 +1516,7 @@ func (s *Redis) ZRevRangeWithScores(key string, start, stop int64) (val []Pair,
 	return
 }
 
+// ZrangebyscoreWithScores is the implementation of redis zrangebyscore command with scores.
 func (s *Redis) ZrangebyscoreWithScores(key string, start, stop int64) (val []Pair, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1448,6 +1539,7 @@ func (s *Redis) ZrangebyscoreWithScores(key string, start, stop int64) (val []Pa
 	return
 }
 
+// ZrangebyscoreWithScoresAndLimit is the implementation of redis zrangebyscore command with scores and limit.
 func (s *Redis) ZrangebyscoreWithScoresAndLimit(key string, start, stop int64, page, size int) (
 	val []Pair, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
@@ -1477,6 +1569,7 @@ func (s *Redis) ZrangebyscoreWithScoresAndLimit(key string, start, stop int64, p
 	return
 }
 
+// Zrevrange is the implementation of redis zrevrange command.
 func (s *Redis) Zrevrange(key string, start, stop int64) (val []string, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1491,6 +1584,7 @@ func (s *Redis) Zrevrange(key string, start, stop int64) (val []string, err erro
 	return
 }
 
+// ZrevrangebyscoreWithScores is the implementation of redis zrevrangebyscore command with scores.
 func (s *Redis) ZrevrangebyscoreWithScores(key string, start, stop int64) (val []Pair, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1513,6 +1607,7 @@ func (s *Redis) ZrevrangebyscoreWithScores(key string, start, stop int64) (val [
 	return
 }
 
+// ZrevrangebyscoreWithScoresAndLimit is the implementation of redis zrevrangebyscore command with scores and limit.
 func (s *Redis) ZrevrangebyscoreWithScoresAndLimit(key string, start, stop int64, page, size int) (
 	val []Pair, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
@@ -1542,6 +1637,7 @@ func (s *Redis) ZrevrangebyscoreWithScoresAndLimit(key string, start, stop int64
 	return
 }
 
+// Zrevrank is the implementation of redis zrevrank command.
 func (s *Redis) Zrevrank(key string, field string) (val int64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1556,6 +1652,7 @@ func (s *Redis) Zrevrank(key string, field string) (val int64, err error) {
 	return
 }
 
+// Zunionstore is the implementation of redis zunionstore command.
 func (s *Redis) Zunionstore(dest string, store ZStore, keys ...string) (val int64, err error) {
 	err = s.brk.DoWithAcceptable(func() error {
 		conn, err := getRedis(s)
@@ -1570,6 +1667,7 @@ func (s *Redis) Zunionstore(dest string, store ZStore, keys ...string) (val int6
 	return
 }
 
+// String returns the string representation of s.
 func (s *Redis) String() string {
 	return s.Addr
 }

core/stores/redis/redisblockingnode.go

@@ -7,11 +7,13 @@ import (
 	"github.com/tal-tech/go-zero/core/logx"
 )
 
+// ClosableNode interface represents a closable redis node.
 type ClosableNode interface {
 	RedisNode
 	Close()
 }
 
+// CreateBlockingNode returns a ClosableNode.
 func CreateBlockingNode(r *Redis) (ClosableNode, error) {
 	timeout := readWriteTimeout + blockingQueryTimeout
 

core/stores/redis/redislock.go

@@ -28,6 +28,7 @@ end`
 	millisPerSecond = 1000
 )
 
+// A RedisLock is a redis lock.
 type RedisLock struct {
 	store   *Redis
 	seconds uint32
@@ -39,6 +40,7 @@ func init() {
 	rand.Seed(time.Now().UnixNano())
 }
 
+// NewRedisLock returns a RedisLock.
 func NewRedisLock(store *Redis, key string) *RedisLock {
 	return &RedisLock{
 		store: store,
@@ -47,6 +49,7 @@ func NewRedisLock(store *Redis, key string) *RedisLock {
 	}
 }
 
+// Acquire acquires the lock.
 func (rl *RedisLock) Acquire() (bool, error) {
 	seconds := atomic.LoadUint32(&rl.seconds)
 	resp, err := rl.store.Eval(lockCommand, []string{rl.key}, []string{
@@ -69,6 +72,7 @@ func (rl *RedisLock) Acquire() (bool, error) {
 	return false, nil
 }
 
+// Release releases the lock.
 func (rl *RedisLock) Release() (bool, error) {
 	resp, err := rl.store.Eval(delCommand, []string{rl.key}, []string{rl.id})
 	if err != nil {
@@ -83,6 +87,7 @@ func (rl *RedisLock) Release() (bool, error) {
 	return reply == 1, nil
 }
 
+// SetExpire sets the expire.
 func (rl *RedisLock) SetExpire(seconds int) {
 	atomic.StoreUint32(&rl.seconds, uint32(seconds))
 }

core/stores/redis/redistest/redistest.go

@@ -8,6 +8,7 @@ import (
 	"github.com/tal-tech/go-zero/core/stores/redis"
 )
 
+// CreateRedis returns a in process redis.Redis.
 func CreateRedis() (r *redis.Redis, clean func(), err error) {
 	mr, err := miniredis.Run()
 	if err != nil {

core/stores/redis/scriptcache.go

@@ -12,13 +12,16 @@ var (
 )
 
 type (
+	// Map is an alias of map[string]string.
 	Map map[string]string
 
+	// A ScriptCache is a cache that stores a script with its sha key.
 	ScriptCache struct {
 		atomic.Value
 	}
 )
 
+// GetScriptCache returns a ScriptCache.
 func GetScriptCache() *ScriptCache {
 	once.Do(func() {
 		instance = &ScriptCache{}
@@ -28,12 +31,14 @@ func GetScriptCache() *ScriptCache {
 	return instance
 }
 
+// GetSha returns the sha string of given script.
 func (sc *ScriptCache) GetSha(script string) (string, bool) {
 	cache := sc.Load().(Map)
 	ret, ok := cache[script]
 	return ret, ok
 }
 
+// SetSha sets script with sha into the ScriptCache.
 func (sc *ScriptCache) SetSha(script, sha string) {
 	lock.Lock()
 	defer lock.Unlock()

core/stores/sqlc/cachedsql.go

@@ -14,25 +14,32 @@ import (
 const cacheSafeGapBetweenIndexAndPrimary = time.Second * 5
 
 var (
+	// ErrNotFound is an alias of sqlx.ErrNotFound.
 	ErrNotFound = sqlx.ErrNotFound
 
 	// can't use one SharedCalls per conn, because multiple conns may share the same cache key.
 	exclusiveCalls = syncx.NewSharedCalls()
-	stats          = cache.NewCacheStat("sqlc")
+	stats          = cache.NewStat("sqlc")
 )
 
 type (
-	ExecFn         func(conn sqlx.SqlConn) (sql.Result, error)
+	// ExecFn defines the sql exec method.
-	IndexQueryFn   func(conn sqlx.SqlConn, v interface{}) (interface{}, error)
+	ExecFn func(conn sqlx.SqlConn) (sql.Result, error)
+	// IndexQueryFn defines the query method that based on unique indexes.
+	IndexQueryFn func(conn sqlx.SqlConn, v interface{}) (interface{}, error)
+	// PrimaryQueryFn defines the query method that based on primary keys.
 	PrimaryQueryFn func(conn sqlx.SqlConn, v, primary interface{}) error
-	QueryFn        func(conn sqlx.SqlConn, v interface{}) error
+	// QueryFn defines the query method.
+	QueryFn func(conn sqlx.SqlConn, v interface{}) error
 
+	// A CachedConn is a DB connection with cache capability.
 	CachedConn struct {
 		db    sqlx.SqlConn
 		cache cache.Cache
 	}
 )
 
+// NewNodeConn returns a CachedConn with a redis node cache.
 func NewNodeConn(db sqlx.SqlConn, rds *redis.Redis, opts ...cache.Option) CachedConn {
 	return CachedConn{
 		db:    db,
@@ -40,6 +47,7 @@ func NewNodeConn(db sqlx.SqlConn, rds *redis.Redis, opts ...cache.Option) Cached
 	}
 }
 
+// NewConn returns a CachedConn with a redis cluster cache.
 func NewConn(db sqlx.SqlConn, c cache.CacheConf, opts ...cache.Option) CachedConn {
 	return CachedConn{
 		db:    db,
@@ -47,14 +55,17 @@ func NewConn(db sqlx.SqlConn, c cache.CacheConf, opts ...cache.Option) CachedCon
 	}
 }
 
+// DelCache deletes cache with keys.
 func (cc CachedConn) DelCache(keys ...string) error {
 	return cc.cache.Del(keys...)
 }
 
+// GetCache unmarshals cache with given key into v.
 func (cc CachedConn) GetCache(key string, v interface{}) error {
 	return cc.cache.Get(key, v)
 }
 
+// Exec runs given exec on given keys, and returns execution result.
 func (cc CachedConn) Exec(exec ExecFn, keys ...string) (sql.Result, error) {
 	res, err := exec(cc.db)
 	if err != nil {
@@ -68,16 +79,19 @@ func (cc CachedConn) Exec(exec ExecFn, keys ...string) (sql.Result, error) {
 	return res, nil
 }
 
+// ExecNoCache runs exec with given sql statement, without affecting cache.
 func (cc CachedConn) ExecNoCache(q string, args ...interface{}) (sql.Result, error) {
 	return cc.db.Exec(q, args...)
 }
 
+// QueryRow unmarshals into v with given key and query func.
 func (cc CachedConn) QueryRow(v interface{}, key string, query QueryFn) error {
 	return cc.cache.Take(v, key, func(v interface{}) error {
 		return query(cc.db, v)
 	})
 }
 
+// QueryRowIndex unmarshals into v with given key.
 func (cc CachedConn) QueryRowIndex(v interface{}, key string, keyer func(primary interface{}) string,
 	indexQuery IndexQueryFn, primaryQuery PrimaryQueryFn) error {
 	var primaryKey interface{}
@@ -104,19 +118,23 @@ func (cc CachedConn) QueryRowIndex(v interface{}, key string, keyer func(primary
 	})
 }
 
+// QueryRowNoCache unmarshals into v with given statement.
 func (cc CachedConn) QueryRowNoCache(v interface{}, q string, args ...interface{}) error {
 	return cc.db.QueryRow(v, q, args...)
 }
 
-// QueryRowsNoCache doesn't use cache, because it might cause consistency problem.
+// QueryRowsNoCache unmarshals into v with given statement.
+// It doesn't use cache, because it might cause consistency problem.
 func (cc CachedConn) QueryRowsNoCache(v interface{}, q string, args ...interface{}) error {
 	return cc.db.QueryRows(v, q, args...)
 }
 
+// SetCache sets v into cache with given key.
 func (cc CachedConn) SetCache(key string, v interface{}) error {
 	return cc.cache.Set(key, v)
 }
 
+// Transact runs given fn in transaction mode.
 func (cc CachedConn) Transact(fn func(sqlx.Session) error) error {
 	return cc.db.Transact(fn)
 }

core/stores/sqlx/bulkinserter.go

@@ -20,8 +20,10 @@ const (
 var emptyBulkStmt bulkStmt
 
 type (
+	// ResultHandler defines the method of result handlers.
 	ResultHandler func(sql.Result, error)
 
+	// A BulkInserter is used to batch insert records.
 	BulkInserter struct {
 		executor *executors.PeriodicalExecutor
 		inserter *dbInserter
@@ -35,6 +37,7 @@ type (
 	}
 )
 
+// NewBulkInserter returns a BulkInserter.
 func NewBulkInserter(sqlConn SqlConn, stmt string) (*BulkInserter, error) {
 	bkStmt, err := parseInsertStmt(stmt)
 	if err != nil {
@@ -53,10 +56,12 @@ func NewBulkInserter(sqlConn SqlConn, stmt string) (*BulkInserter, error) {
 	}, nil
 }
 
+// Flush flushes all the pending records.
 func (bi *BulkInserter) Flush() {
 	bi.executor.Flush()
 }
 
+// Insert inserts given args.
 func (bi *BulkInserter) Insert(args ...interface{}) error {
 	value, err := format(bi.stmt.valueFormat, args...)
 	if err != nil {
@@ -68,17 +73,20 @@ func (bi *BulkInserter) Insert(args ...interface{}) error {
 	return nil
 }
 
+// SetResultHandler sets the given handler.
 func (bi *BulkInserter) SetResultHandler(handler ResultHandler) {
 	bi.executor.Sync(func() {
 		bi.inserter.resultHandler = handler
 	})
 }
 
+// UpdateOrDelete runs update or delete queries, which flushes pending records first.
 func (bi *BulkInserter) UpdateOrDelete(fn func()) {
 	bi.executor.Flush()
 	fn()
 }
 
+// UpdateStmt updates the insert statement.
 func (bi *BulkInserter) UpdateStmt(stmt string) error {
 	bkStmt, err := parseInsertStmt(stmt)
 	if err != nil {

core/stores/sqlx/mysql.go

@@ -7,6 +7,7 @@ const (
 	duplicateEntryCode uint16 = 1062
 )
 
+// NewMysql returns a mysql connection.
 func NewMysql(datasource string, opts ...SqlOption) SqlConn {
 	opts = append(opts, withMysqlAcceptable())
 	return NewSqlConn(mysqlDriverName, datasource, opts...)

core/stores/sqlx/orm.go

@@ -11,9 +11,13 @@ import (
 const tagName = "db"
 
 var (
-	ErrNotMatchDestination  = errors.New("not matching destination to scan")
+	// ErrNotMatchDestination is an error that indicates not matching destination to scan.
-	ErrNotReadableValue     = errors.New("value not addressable or interfaceable")
+	ErrNotMatchDestination = errors.New("not matching destination to scan")
-	ErrNotSettable          = errors.New("passed in variable is not settable")
+	// ErrNotReadableValue is an error that indicates value is not addressable or interfaceable.
+	ErrNotReadableValue = errors.New("value not addressable or interfaceable")
+	// ErrNotSettable is an error that indicates the passed in variable is not settable.
+	ErrNotSettable = errors.New("passed in variable is not settable")
+	// ErrUnsupportedValueType is an error that indicates unsupported unmarshal type.
 	ErrUnsupportedValueType = errors.New("unsupported unmarshal type")
 )
 

core/stores/sqlx/sqlconn.go

@@ -6,6 +6,7 @@ import (
 	"github.com/tal-tech/go-zero/core/breaker"
 )
 
+// ErrNotFound is an alias of sql.ErrNoRows
 var ErrNotFound = sql.ErrNoRows
 
 type (
@@ -25,8 +26,10 @@ type (
 		Transact(func(session Session) error) error
 	}
 
+	// SqlOption defines the method to customize a sql connection.
 	SqlOption func(*commonSqlConn)
 
+	// StmtSession interface represents a session that can be used to execute statements.
 	StmtSession interface {
 		Close() error
 		Exec(args ...interface{}) (sql.Result, error)
@@ -62,6 +65,7 @@ type (
 	}
 )
 
+// NewSqlConn returns a SqlConn with given driver name and datasource.
 func NewSqlConn(driverName, datasource string, opts ...SqlOption) SqlConn {
 	conn := &commonSqlConn{
 		driverName: driverName,