chore: fix golint issues (#1396)

core/discov/accountregistry.go

@@ -2,6 +2,7 @@ package discov
 
 import "github.com/tal-tech/go-zero/core/discov/internal"
 
+// RegisterAccount registers the username/password to the given etcd cluster.
 func RegisterAccount(endpoints []string, user, pass string) {
 	internal.AddAccount(endpoints, user, pass)
 }

core/discov/internal/accountmanager.go

@@ -2,16 +2,18 @@ package internal
 
 import "sync"
 
-type Account struct {
-	User string
-	Pass string
-}
-
 var (
 	accounts = make(map[string]Account)
 	lock     sync.RWMutex
 )
 
+// Account holds the username/password for an etcd cluster.
+type Account struct {
+	User string
+	Pass string
+}
+
+// AddAccount adds the username/password for the given etcd cluster.
 func AddAccount(endpoints []string, user, pass string) {
 	lock.Lock()
 	defer lock.Unlock()
@@ -22,6 +24,7 @@ func AddAccount(endpoints []string, user, pass string) {
 	}
 }
 
+// GetAccount gets the username/password for the given etcd cluster.
 func GetAccount(endpoints []string) (Account, bool) {
 	lock.RLock()
 	defer lock.RUnlock()

core/discov/subscriber.go

@@ -58,6 +58,7 @@ func Exclusive() SubOption {
 	}
 }
 
+// WithSubEtcdAccount customizes the Subscriber with given etcd username/password.
 func WithSubEtcdAccount(user, pass string) SubOption {
 	return func(sub *Subscriber) {
 		internal.AddAccount(sub.endpoints, user, pass)