-
Notifications
You must be signed in to change notification settings - Fork 0
/
main.go
172 lines (130 loc) · 3.41 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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
package main
import (
"context"
"encoding/json"
"io/ioutil"
"log"
"net"
"os"
"path/filepath"
"reflect"
"strings"
"github.com/fatih/structs"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc"
"github.com/davecgh/go-spew/spew"
"github.com/mitchellh/mapstructure"
"github.com/pkg/errors"
grpcmiddleware "github.com/grpc-ecosystem/go-grpc-middleware"
"github.com/ppwfx/grpc-mock/grpc/pingpb"
)
func main() {
err := run()
if err != nil {
log.Fatalln(err)
}
}
func run() error {
ms, err := LoadMocks("mocks")
if err != nil {
return errors.Wrapf(err, "failed to load mocks")
}
srv := grpc.NewServer(grpcmiddleware.WithUnaryServerChain(
mockInterceptor(pingpb.UnimplementedPingServiceServer{}, ms),
))
pingpb.RegisterPingServiceServer(srv, pingpb.UnimplementedPingServiceServer{})
ctx := context.Background()
ctx, cancel := context.WithCancel(ctx)
defer cancel()
g, gtx := errgroup.WithContext(ctx)
l, err := net.Listen("tcp", ":8080")
if err != nil {
return errors.Wrapf(err, "failed to listen on :8080")
}
g.Go(func() error {
err := srv.Serve(l)
if err != nil {
return errors.Wrapf(err, "failed ")
}
return nil
})
g.Go(func() error {
<-gtx.Done()
srv.Stop()
return nil
})
d, err := grpc.Dial(":8080", grpc.WithInsecure())
if err != nil {
return errors.Wrapf(err, "failed to dial")
}
c := pingpb.NewPingServiceClient(d)
rsp, err := c.Ping(ctx, &pingpb.PingRequest{
Ping: "hello",
})
if err != nil {
return errors.Wrapf(err, "failed to ping")
}
spew.Dump(rsp)
cancel()
err = g.Wait()
if err != nil {
return errors.Wrapf(err, "failed to wait")
}
return nil
}
func mockInterceptor(svc interface{}, mocks map[string][]Mock) func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
t := reflect.TypeOf(svc)
return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
method := strings.TrimPrefix(info.FullMethod, "/ping.PingService/")
m, ok := t.MethodByName(method)
if !ok {
return nil, errors.Errorf("did not find method=%v", method)
}
rsp := reflect.New(m.Type.Out(0).Elem()).Interface()
err := mapMock(mocks[method], req, rsp)
if err != nil {
return nil, errors.Wrapf(err, "failed to map mocks")
}
return rsp, nil
}
}
func LoadMocks(dir string) (map[string][]Mock, error) {
files, err := ioutil.ReadDir(dir)
if err != nil {
return nil, errors.Wrapf(err, "failed to read dir=%v", dir)
}
mocks := map[string][]Mock{}
for _, file := range files {
f, err := os.Open(filepath.Join(dir, file.Name()))
if err != nil {
return nil, errors.Wrapf(err, "failed to open file=%v", file.Name())
}
m := []Mock{}
err = json.NewDecoder(f).Decode(&m)
if err != nil {
return nil, errors.Wrapf(err, "failed to decode mock with file=%v", file.Name())
}
mocks[strings.TrimSuffix(file.Name(), filepath.Ext(file.Name()))] = m
}
return mocks, nil
}
type Mock struct {
Request map[string]interface{}
Response map[string]interface{}
StatusCode int
}
func mapMock(ms []Mock, req, rsp interface{}) error {
s := structs.New(req)
s.TagName = "json"
for i := range ms {
if !reflect.DeepEqual(ms[i].Request, s.Map()) {
continue
}
err := mapstructure.Decode(ms[i].Response, &rsp)
if err != nil {
return errors.Wrapf(err, "failed to decode response")
}
return nil
}
return nil
}