fix golint issues in core/fx (#486)

core/fs/files.go

@@ -7,6 +7,7 @@ import (
 	"syscall"
 )
 
+// CloseOnExec makes sure closing the file on process forking.
 func CloseOnExec(file *os.File) {
 	if file != nil {
 		syscall.CloseOnExec(int(file.Fd()))

core/fx/fn.go

@@ -20,18 +20,30 @@ type (
 		workers          int
 	}
 
-	FilterFunc   func(item interface{}) bool
-	ForAllFunc   func(pipe <-chan interface{})
-	ForEachFunc  func(item interface{})
+	// FilterFunc defines the method to filter a Stream.
+	FilterFunc func(item interface{}) bool
+	// ForAllFunc defines the method to handle all elements in a Stream.
+	ForAllFunc func(pipe <-chan interface{})
+	// ForEachFunc defines the method to handle each element in a Stream.
+	ForEachFunc func(item interface{})
+	// GenerateFunc defines the method to send elements into a Stream.
 	GenerateFunc func(source chan<- interface{})
-	KeyFunc      func(item interface{}) interface{}
-	LessFunc     func(a, b interface{}) bool
-	MapFunc      func(item interface{}) interface{}
-	Option       func(opts *rxOptions)
+	// KeyFunc defines the method to generate keys for the elements in a Stream.
+	KeyFunc func(item interface{}) interface{}
+	// LessFunc defines the method to compare the elements in a Stream.
+	LessFunc func(a, b interface{}) bool
+	// MapFunc defines the method to map each element to another object in a Stream.
+	MapFunc func(item interface{}) interface{}
+	// Option defines the method to customize a Stream.
+	Option func(opts *rxOptions)
+	// ParallelFunc defines the method to handle elements parallelly.
 	ParallelFunc func(item interface{})
-	ReduceFunc   func(pipe <-chan interface{}) (interface{}, error)
-	WalkFunc     func(item interface{}, pipe chan<- interface{})
+	// ReduceFunc defines the method to reduce all the elements in a Stream.
+	ReduceFunc func(pipe <-chan interface{}) (interface{}, error)
+	// WalkFunc defines the method to walk through all the elements in a Stream.
+	WalkFunc func(item interface{}, pipe chan<- interface{})
 
+	// A Stream is a stream that can be used to do stream processing.
 	Stream struct {
 		source <-chan interface{}
 	}
@@ -159,6 +171,7 @@ func (p Stream) Group(fn KeyFunc) Stream {
 	return Range(source)
 }
 
+// Head returns the first n elements in p.
 func (p Stream) Head(n int64) Stream {
 	if n < 1 {
 		panic("n must be greater than 0")
@@ -187,7 +200,7 @@ func (p Stream) Head(n int64) Stream {
 	return Range(source)
 }
 
-// Maps converts each item to another corresponding item, which means it's a 1:1 model.
+// Map converts each item to another corresponding item, which means it's a 1:1 model.
 func (p Stream) Map(fn MapFunc, opts ...Option) Stream {
 	return p.Walk(func(item interface{}, pipe chan<- interface{}) {
 		pipe <- fn(item)
@@ -274,6 +287,7 @@ func (p Stream) Split(n int) Stream {
 	return Range(source)
 }
 
+// Tail returns the last n elements in p.
 func (p Stream) Tail(n int64) Stream {
 	if n < 1 {
 		panic("n should be greater than 0")

core/fx/parallel.go

@@ -2,6 +2,7 @@ package fx
 
 import "github.com/tal-tech/go-zero/core/threading"
 
+// Parallel runs fns parallelly and waits for done.
 func Parallel(fns ...func()) {
 	group := threading.NewRoutineGroup()
 	for _, fn := range fns {

core/fx/retry.go

@@ -5,6 +5,7 @@ import "github.com/tal-tech/go-zero/core/errorx"
 const defaultRetryTimes = 3
 
 type (
+	// RetryOption defines the method to customize DoWithRetry.
 	RetryOption func(*retryOptions)
 
 	retryOptions struct {
@@ -12,7 +13,8 @@ type (
 	}
 )
 
-func DoWithRetries(fn func() error, opts ...RetryOption) error {
+// DoWithRetry runs fn, and retries if failed. Default to retry 3 times.
+func DoWithRetry(fn func() error, opts ...RetryOption) error {
 	var options = newRetryOptions()
 	for _, opt := range opts {
 		opt(options)
@@ -30,7 +32,8 @@ func DoWithRetries(fn func() error, opts ...RetryOption) error {
 	return berr.Err()
 }
 
-func WithRetries(times int) RetryOption {
+// WithRetry customize a DoWithRetry call with given retry times.
+func WithRetry(times int) RetryOption {
 	return func(options *retryOptions) {
 		options.times = times
 	}

core/fx/retry_test.go

@@ -8,12 +8,12 @@ import (
 )
 
 func TestRetry(t *testing.T) {
-	assert.NotNil(t, DoWithRetries(func() error {
+	assert.NotNil(t, DoWithRetry(func() error {
 		return errors.New("any")
 	}))
 
 	var times int
-	assert.Nil(t, DoWithRetries(func() error {
+	assert.Nil(t, DoWithRetry(func() error {
 		times++
 		if times == defaultRetryTimes {
 			return nil
@@ -22,7 +22,7 @@ func TestRetry(t *testing.T) {
 	}))
 
 	times = 0
-	assert.NotNil(t, DoWithRetries(func() error {
+	assert.NotNil(t, DoWithRetry(func() error {
 		times++
 		if times == defaultRetryTimes+1 {
 			return nil
@@ -32,11 +32,11 @@ func TestRetry(t *testing.T) {
 
 	var total = 2 * defaultRetryTimes
 	times = 0
-	assert.Nil(t, DoWithRetries(func() error {
+	assert.Nil(t, DoWithRetry(func() error {
 		times++
 		if times == total {
 			return nil
 		}
 		return errors.New("any")
-	}, WithRetries(total)))
+	}, WithRetry(total)))
 }

core/fx/timeout.go

@@ -3,21 +3,27 @@ package fx
 import (
 	"context"
 	"time"
+
+	"github.com/tal-tech/go-zero/core/contextx"
 )
 
 var (
+	// ErrCanceled is the error returned when the context is canceled.
 	ErrCanceled = context.Canceled
-	ErrTimeout  = context.DeadlineExceeded
+	// ErrTimeout is the error returned when the context's deadline passes.
+	ErrTimeout = context.DeadlineExceeded
 )
 
-type FxOption func() context.Context
+// DoOption defines the method to customize a DoWithTimeout call.
+type DoOption func() context.Context
 
-func DoWithTimeout(fn func() error, timeout time.Duration, opts ...FxOption) error {
+// DoWithTimeout runs fn with timeout control.
+func DoWithTimeout(fn func() error, timeout time.Duration, opts ...DoOption) error {
 	parentCtx := context.Background()
 	for _, opt := range opts {
 		parentCtx = opt()
 	}
-	ctx, cancel := context.WithTimeout(parentCtx, timeout)
+	ctx, cancel := contextx.ShrinkDeadline(parentCtx, timeout)
 	defer cancel()
 
 	done := make(chan error)
@@ -42,7 +48,8 @@ func DoWithTimeout(fn func() error, timeout time.Duration, opts ...FxOption) err
 	}
 }
 
-func WithContext(ctx context.Context) FxOption {
+// WithContext customizes a DoWithTimeout call with given ctx.
+func WithContext(ctx context.Context) DoOption {
 	return func() context.Context {
 		return ctx
 	}