-
Notifications
You must be signed in to change notification settings - Fork 4.3k
/
main.go
125 lines (98 loc) · 3.29 KB
/
main.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
/*
*
* Copyright 2018 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
// Binary wait_for_ready is an example for "wait for ready".
package main
import (
"context"
"fmt"
"log"
"net"
"sync"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
pb "google.golang.org/grpc/examples/features/proto/echo"
"google.golang.org/grpc/status"
)
// server is used to implement EchoServer.
type server struct{}
func (s *server) UnaryEcho(ctx context.Context, req *pb.EchoRequest) (*pb.EchoResponse, error) {
return &pb.EchoResponse{Message: req.Message}, nil
}
func (s *server) ServerStreamingEcho(req *pb.EchoRequest, stream pb.Echo_ServerStreamingEchoServer) error {
return status.Error(codes.Unimplemented, "RPC unimplemented")
}
func (s *server) ClientStreamingEcho(stream pb.Echo_ClientStreamingEchoServer) error {
return status.Error(codes.Unimplemented, "RPC unimplemented")
}
func (s *server) BidirectionalStreamingEcho(stream pb.Echo_BidirectionalStreamingEchoServer) error {
return status.Error(codes.Unimplemented, "RPC unimplemented")
}
// serve starts listening with a 2 seconds delay.
func serve() {
lis, err := net.Listen("tcp", ":50053")
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
s := grpc.NewServer()
pb.RegisterEchoServer(s, &server{})
if err := s.Serve(lis); err != nil {
log.Fatalf("failed to serve: %v", err)
}
}
func main() {
conn, err := grpc.Dial("localhost:50053", grpc.WithInsecure())
if err != nil {
log.Fatalf("did not connect: %v", err)
}
defer conn.Close()
c := pb.NewEchoClient(conn)
var wg sync.WaitGroup
wg.Add(3)
// "Wait for ready" is not enabled, returns error with code "Unavailable".
go func() {
defer wg.Done()
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
_, err := c.UnaryEcho(ctx, &pb.EchoRequest{Message: "Hi!"})
got := status.Code(err)
fmt.Printf("[1] wanted = %v, got = %v\n", codes.Unavailable, got)
}()
// "Wait for ready" is enabled, returns nil error.
go func() {
defer wg.Done()
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
_, err := c.UnaryEcho(ctx, &pb.EchoRequest{Message: "Hi!"}, grpc.WaitForReady(true))
got := status.Code(err)
fmt.Printf("[2] wanted = %v, got = %v\n", codes.OK, got)
}()
// "Wait for ready" is enabled but exceeds the deadline before server starts listening,
// returns error with code "DeadlineExceeded".
go func() {
defer wg.Done()
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
defer cancel()
_, err := c.UnaryEcho(ctx, &pb.EchoRequest{Message: "Hi!"}, grpc.WaitForReady(true))
got := status.Code(err)
fmt.Printf("[3] wanted = %v, got = %v\n", codes.DeadlineExceeded, got)
}()
time.Sleep(2 * time.Second)
go serve()
wg.Wait()
}