enhance: add log interceptor

Signed-off-by: ThreadDao <yufen.zong@zilliz.com>

tests/go_client/base/milvus_client.go

@@ -2,10 +2,10 @@ package base
 
 import (
 	"context"
-
-	"github.com/milvus-io/milvus/pkg/log"
-
+	"encoding/json"
 	"github.com/milvus-io/milvus/client/v2/entity"
+	"github.com/milvus-io/milvus/pkg/log"
+	"strings"
 
 	"go.uber.org/zap"
 
@@ -28,12 +28,54 @@ func postResponse(funcName string, err error, res ...interface{}) {
 	}
 }
 
+
+func LoggingUnaryInterceptor() grpc.UnaryClientInterceptor {
+	return func(ctx 	context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
+		maxLogLength := 200
+		_method := strings.Split(method, "/")
+		_methodShotName := _method[len(_method) - 1]
+		// Marshal req to json str
+		reqJSON, err := json.Marshal(req)
+		if err != nil {
+			log.Error("Failed to marshal request", zap.Error(err))
+			reqJSON = []byte("could not marshal request")
+		}
+		reqStr := string(reqJSON)
+		if len(reqStr) > maxLogLength {
+			reqStr = reqStr[:maxLogLength] + "..."
+		}
+
+		// log before
+		log.Info("Request", zap.String("method", _methodShotName), zap.Any("reqs", reqStr))
+
+		// invoker
+		errResp := invoker(ctx, method, req, reply, cc, opts...)
+
+		// Marshal reply to json str
+		respJSON, err := json.Marshal(reply)
+		if err != nil {
+			log.Error("Failed to marshal response", zap.Error(err))
+			respJSON = []byte("could not marshal response")
+		}
+		respStr := string(respJSON)
+		if len(respStr) > maxLogLength {
+			respStr = respStr[:maxLogLength] + "..."
+		}
+
+		// log after
+		log.Info("Response", zap.String("method", _methodShotName), zap.Any("resp", respStr))
+		return errResp
+	}
+}
+
+
 type MilvusClient struct {
 	mClient *clientv2.Client
 }
 
 func NewMilvusClient(ctx context.Context, cfg *clientv2.ClientConfig) (*MilvusClient, error) {
 	preRequest("NewClient", ctx, cfg)
+	cfg.DialOptions = append(cfg.DialOptions, grpc.WithUnaryInterceptor(LoggingUnaryInterceptor()))
 	mClient, err := clientv2.New(ctx, cfg)
 	postResponse("NewClient", err, mClient)
 	return &MilvusClient{
@@ -50,7 +92,7 @@ func (mc *MilvusClient) Close(ctx context.Context) error {
 
 // -- database --
 
-// ListDatabases list all database in milvus cluster.
+// UsingDatabase list all database in milvus cluster.
 func (mc *MilvusClient) UsingDatabase(ctx context.Context, option clientv2.UsingDatabaseOption) error {
 	preRequest("UsingDatabase", ctx, option)
 	err := mc.mClient.UsingDatabase(ctx, option)
@@ -66,6 +108,7 @@ func (mc *MilvusClient) ListDatabases(ctx context.Context, option clientv2.ListD
 	return databaseNames, err
 }
 
+
 // CreateDatabase create database with the given name.
 func (mc *MilvusClient) CreateDatabase(ctx context.Context, option clientv2.CreateDatabaseOption, callOptions ...grpc.CallOption) error {
 	preRequest("CreateDatabase", ctx, option, callOptions)