Repository: milvus-io/milvus-sdk-go
Pull request #303 (2022-08-17 03:23:26)

Add retry mechanism for retryable error codes
Signed-off-by: yun.zhang <yun.zhang@zilliz.com>

sre-ci-robot: [APPROVALNOTIFIER] This PR is **NOT APPROVED**

This pull-request has been approved by: *<a href="https://github.com/milvus-io/milvus-sdk-go/pull/303#" title="Author self-approved">jaime0815</a>*
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<details open>
Needs approval from an approver in each of these files:

- **[OWNERS](https://github.com/milvus-io/milvus-sdk-go/blob/master/OWNERS)**

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</details>
<!-- META={"approvers":["sunby"]} -->
mergify[bot]: @jaime0815 Please associate the related issue to the body of your Pull Request.  (eg. “issue: #187”)
codecov[bot]: # [Codecov](https://codecov.io/gh/milvus-io/milvus-sdk-go/pull/303?src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io) Report
> Merging [#303](https://codecov.io/gh/milvus-io/milvus-sdk-go/pull/303?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io) (54128ed) into [master](https://codecov.io/gh/milvus-io/milvus-sdk-go/commit/5dadcc6e1628f9cf9f15a690ef202d691cba1460?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io) (5dadcc6) will **increase** coverage by `0.00%`.
> The diff coverage is `100.00%`.

[![Impacted file tree graph](https://codecov.io/gh/milvus-io/milvus-sdk-go/pull/303/graphs/tree.svg?width=650&height=150&src=pr&token=WJK43PV390&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io)](https://codecov.io/gh/milvus-io/milvus-sdk-go/pull/303?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io)

```diff
@@           Coverage Diff           @@
##           master     #303   +/-   ##
=======================================
  Coverage   90.32%   90.32%           
=======================================
  Files          24       24           
  Lines        2645     2668   +23     
=======================================
+ Hits         2389     2410   +21     
- Misses        176      177    +1     
- Partials       80       81    +1     
```


| [Impacted Files](https://codecov.io/gh/milvus-io/milvus-sdk-go/pull/303?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io) | Coverage Δ | |
|---|---|---|
| [client/client\_grpc\_collection.go](https://codecov.io/gh/milvus-io/milvus-sdk-go/pull/303/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io#diff-Y2xpZW50L2NsaWVudF9ncnBjX2NvbGxlY3Rpb24uZ28=) | `86.87% <100.00%> (+0.43%)` | :arrow_up: |

congqixia: /kind improvement
sre-ci-robot: [APPROVALNOTIFIER] This PR is **APPROVED**

This pull-request has been approved by: *<a href="https://github.com/milvus-io/milvus-sdk-go/pull/303#pullrequestreview-1075095314" title="LGTM">congqixia</a>*, *<a href="https://github.com/milvus-io/milvus-sdk-go/pull/303#" title="Author self-approved">jaime0815</a>*

The full list of commands accepted by this bot can be found [here](https://go.k8s.io/bot-commands?repo=milvus-io%2Fmilvus-sdk-go).

The pull request process is described [here](https://git.k8s.io/community/contributors/guide/owners.md#the-code-review-process)

<details >
Needs approval from an approver in each of these files:

- ~~[OWNERS](https://github.com/milvus-io/milvus-sdk-go/blob/master/OWNERS)~~ [congqixia]

Approvers can indicate their approval by writing `/approve` in a comment
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Patch:
diff --git a/client/client_grpc_collection.go b/client/client_grpc_collection.go
index f980548..80d5b9b 100644
--- a/client/client_grpc_collection.go
+++ b/client/client_grpc_collection.go
@@ -15,9 +15,17 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"math"
+
 	"time"
 
+	"google.golang.org/grpc/backoff"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/credentials/insecure"
+	"google.golang.org/grpc/keepalive"
+
 	"github.com/golang/protobuf/proto"
+	grpc_retry "github.com/grpc-ecosystem/go-grpc-middleware/retry"
 	"github.com/milvus-io/milvus-sdk-go/v2/entity"
 	"google.golang.org/grpc"
 
@@ -33,20 +41,50 @@ type grpcClient struct {
 
 // connect connect to service
 func (c *grpcClient) connect(ctx context.Context, addr string, opts ...grpc.DialOption) error {
-
-	// if not options provided, use default settings
-	if len(opts) == 0 {
-		opts = append(opts, grpc.WithInsecure(),
-			grpc.WithBlock(),                // block connect until healthy or timeout
-			grpc.WithTimeout(2*time.Second)) // set connect timeout to 2 Second
+	if err := c.establishConnection(addr, opts...); err != nil {
+		return err
 	}
 
-	conn, err := grpc.DialContext(ctx, addr, opts...)
+	c.service = server.NewMilvusServiceClient(c.conn)
+	return nil
+}
+
+func (c *grpcClient) establishConnection(addr string, opts ...grpc.DialOption) error {
+	if addr == "" {
+		return fmt.Errorf("address is empty")
+	}
+
+	defaultOpts := []grpc.DialOption{
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+		grpc.WithKeepaliveParams(keepalive.ClientParameters{
+			Time:                5 * time.Second,
+			Timeout:             10 * time.Second,
+			PermitWithoutStream: true,
+		}),
+		grpc.WithConnectParams(grpc.ConnectParams{
+			Backoff: backoff.Config{
+				BaseDelay:  100 * time.Millisecond,
+				Multiplier: 1.6,
+				Jitter:     0.2,
+				MaxDelay:   3 * time.Second,
+			},
+			MinConnectTimeout: 3 * time.Second,
+		}),
+		grpc.WithUnaryInterceptor(grpc_retry.UnaryClientInterceptor(
+			grpc_retry.WithMax(6),
+			grpc_retry.WithBackoff(func(attempt uint) time.Duration {
+				return 60 * time.Millisecond * time.Duration(math.Pow(3, float64(attempt)))
+			}),
+			grpc_retry.WithCodes(codes.Unavailable, codes.ResourceExhausted))),
+	}
+
+	opts = append(opts, defaultOpts...)
+	conn, err := grpc.Dial(addr, opts...)
 	if err != nil {
 		return err
 	}
+
 	c.conn = conn
-	c.service = server.NewMilvusServiceClient(c.conn)
 	return nil
 }
 
diff --git a/go.mod b/go.mod
index 6601081..149923a 100644
--- a/go.mod
+++ b/go.mod
@@ -1,10 +1,22 @@
 module github.com/milvus-io/milvus-sdk-go/v2
 
-go 1.15
+go 1.17
 
 require (
 	github.com/golang/protobuf v1.5.2
-	github.com/stretchr/testify v1.7.0
-	google.golang.org/grpc v1.31.0
-	google.golang.org/protobuf v1.26.0
+	github.com/grpc-ecosystem/go-grpc-middleware v1.3.0
+	github.com/stretchr/testify v1.8.0
+	google.golang.org/grpc v1.48.0
+	google.golang.org/grpc/examples v0.0.0-20220617181431-3e7b97febc7f
+	google.golang.org/protobuf v1.28.1
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	golang.org/x/net v0.0.0-20201021035429-f5854403a974 // indirect
+	golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4 // indirect
+	golang.org/x/text v0.3.3 // indirect
+	google.golang.org/genproto v0.0.0-20200806141610-86f49bd18e98 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index da1fb37..6f0c58d 100644
--- a/go.sum
+++ b/go.sum
@@ -1,73 +1,178 @@
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-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
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Test patch:
diff --git a/client/client_test.go b/client/client_test.go
index 4992f80..bbbda51 100644
--- a/client/client_test.go
+++ b/client/client_test.go
@@ -4,8 +4,18 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log"
+	"net"
 	"reflect"
+	"strings"
 	"testing"
+	"time"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/examples/helloworld/helloworld"
+	"google.golang.org/grpc/keepalive"
+	"google.golang.org/grpc/reflection"
+	"google.golang.org/grpc/status"
 
 	"github.com/milvus-io/milvus-sdk-go/v2/entity"
 	"github.com/milvus-io/milvus-sdk-go/v2/internal/proto/common"
@@ -146,6 +156,65 @@ func TestGrpcClientClose(t *testing.T) {
 	})
 }
 
+type Tserver struct {
+	helloworld.UnimplementedGreeterServer
+	reqCounter   uint
+	SuccessCount uint
+}
+
+func (s *Tserver) SayHello(ctx context.Context, in *helloworld.HelloRequest) (*helloworld.HelloReply, error) {
+	log.Printf("Received: %s", in.Name)
+	s.reqCounter++
+	if s.reqCounter%s.SuccessCount == 0 {
+		log.Printf("success %d", s.reqCounter)
+		return &helloworld.HelloReply{Message: strings.ToUpper(in.Name)}, nil
+	}
+	return nil, status.Errorf(codes.Unavailable, "server: fail it")
+}
+
+func TestGrpcClientRetryPolicy(t *testing.T) {
+	// server
+	port := ":50051"
+	address := "localhost:50051"
+	lis, err := net.Listen("tcp", port)
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+	var kaep = keepalive.EnforcementPolicy{
+		MinTime:             5 * time.Second,
+		PermitWithoutStream: true,
+	}
+	var kasp = keepalive.ServerParameters{
+		Time:    60 * time.Second,
+		Timeout: 60 * time.Second,
+	}
+
+	maxAttempts := 5
+	s := grpc.NewServer(
+		grpc.KeepaliveEnforcementPolicy(kaep),
+		grpc.KeepaliveParams(kasp),
+	)
+	helloworld.RegisterGreeterServer(s, &Tserver{SuccessCount: uint(maxAttempts)})
+	reflection.Register(s)
+	go func() {
+		if err := s.Serve(lis); err != nil {
+			log.Fatalf("failed to serve: %v", err)
+		}
+	}()
+	defer s.Stop()
+
+	grpcClient := &grpcClient{}
+	grpcClient.establishConnection(address)
+	defer grpcClient.Close()
+
+	greeterClient := helloworld.NewGreeterClient(grpcClient.conn)
+	ctx := context.Background()
+	name := fmt.Sprintf("hello world %d", time.Now().Second())
+	res, err := greeterClient.SayHello(ctx, &helloworld.HelloRequest{Name: name})
+	assert.Nil(t, err)
+	assert.Equal(t, res.Message, strings.ToUpper(name))
+}
+
 func successStatus() (*common.Status, error) {
 	return &common.Status{ErrorCode: common.ErrorCode_Success}, nil
 }