Merge remote-tracking branch 'origin/errcode' into errcode

pkg/discoveryregistry/zookeeper/conf.go

@@ -1,4 +1,4 @@
-package openKeeper
+package zookeeper
 
 import (
 	"github.com/go-zookeeper/zk"

pkg/discoveryregistry/zookeeper/discover.go

@@ -1,4 +1,4 @@
-package openKeeper
+package zookeeper
 
 import (
 	"context"
@@ -107,7 +107,7 @@ func (s *ZkClient) GetConn(ctx context.Context, serviceName string, opts ...grpc
 	if len(conns) == 0 {
 		return nil, ErrConnIsNil
 	}
-	return conns[0], nil
+	return s.getConnBalance(conns), nil
 }
 
 func (s *ZkClient) GetFirstConn(ctx context.Context, serviceName string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {

pkg/discoveryregistry/zookeeper/load_balancing.go

@@ -0,0 +1,23 @@
+package zookeeper
+
+import (
+	"sync"
+
+	"google.golang.org/grpc"
+)
+
+type RoundRobin struct {
+	index int
+	lock  sync.Mutex
+}
+
+func (r *RoundRobin) getConnBalance(conns []*grpc.ClientConn) (conn *grpc.ClientConn) {
+	r.lock.Lock()
+	defer r.lock.Unlock()
+	if r.index < len(conns)-1 {
+		r.index++
+	} else {
+		r.index = 0
+	}
+	return conns[r.index]
+}

pkg/discoveryregistry/zookeeper/register.go

@@ -1,4 +1,4 @@
-package openKeeper
+package zookeeper
 
 import (
 	"github.com/go-zookeeper/zk"

pkg/discoveryregistry/zookeeper/resolver.go

@@ -1,4 +1,4 @@
-package openKeeper
+package zookeeper
 
 import (
 	"context"

pkg/discoveryregistry/zookeeper/zk.go

@@ -1,4 +1,4 @@
-package openKeeper
+package zookeeper
 
 import (
 	"context"
@@ -38,6 +38,7 @@ type ZkClient struct {
 	resolvers    map[string]*Resolver
 	localConns   map[string][]resolver.Address
 	balancerName string
+	RoundRobin
 }
 
 type ZkOption func(*ZkClient)