fix golint issues, exported doc (#451)

core/discov/internal/statewatcher.go

@@ -1,4 +1,5 @@
 //go:generate mockgen -package internal -destination statewatcher_mock.go -source statewatcher.go etcdConn
+
 package internal
 
 import (

core/errorx/atomicerror.go

@@ -2,14 +2,17 @@ package errorx
 
 import "sync/atomic"
 
+// AtomicError defines an atomic error.
 type AtomicError struct {
 	err atomic.Value // error
 }
 
+// Set sets the error.
 func (ae *AtomicError) Set(err error) {
 	ae.err.Store(err)
 }
 
+// Load returns the error.
 func (ae *AtomicError) Load() error {
 	if v := ae.err.Load(); v != nil {
 		return v.(error)

core/naming/namer.go

@@ -1,5 +1,6 @@
 package naming
 
+// Namer interface wraps the method Name.
 type Namer interface {
 	Name() string
 }

core/threading/routines.go

@@ -8,11 +8,12 @@ import (
 	"github.com/tal-tech/go-zero/core/rescue"
 )
 
+// GoSafe runs the given fn using another goroutine, recovers if fn panics.
 func GoSafe(fn func()) {
 	go RunSafe(fn)
 }
 
-// Only for debug, never use it in production
+// RoutineId is only for debug, never use it in production.
 func RoutineId() uint64 {
 	b := make([]byte, 64)
 	b = b[:runtime.Stack(b, false)]
@@ -24,6 +25,7 @@ func RoutineId() uint64 {
 	return n
 }
 
+// RunSafe runs the given fn, recovers if fn panics.
 func RunSafe(fn func()) {
 	defer rescue.Recover()