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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
|
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package jsonrpc
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/rpc"
"strings"
"testing"
)
type Args struct {
A, B int
}
type Reply struct {
C int
}
type Arith int
type ArithAddResp struct {
Id interface{} `json:"id"`
Result Reply `json:"result"`
Error interface{} `json:"error"`
}
func (t *Arith) Add(args *Args, reply *Reply) error {
reply.C = args.A + args.B
return nil
}
func (t *Arith) Mul(args *Args, reply *Reply) error {
reply.C = args.A * args.B
return nil
}
func (t *Arith) Div(args *Args, reply *Reply) error {
if args.B == 0 {
return errors.New("divide by zero")
}
reply.C = args.A / args.B
return nil
}
func (t *Arith) Error(args *Args, reply *Reply) error {
panic("ERROR")
}
func init() {
rpc.Register(new(Arith))
}
func TestServerNoParams(t *testing.T) {
cli, srv := net.Pipe()
defer cli.Close()
go ServeConn(srv)
dec := json.NewDecoder(cli)
fmt.Fprintf(cli, `{"method": "Arith.Add", "id": "123"}`)
var resp ArithAddResp
if err := dec.Decode(&resp); err != nil {
t.Fatalf("Decode after no params: %s", err)
}
if resp.Error == nil {
t.Fatalf("Expected error, got nil")
}
}
func TestServerEmptyMessage(t *testing.T) {
cli, srv := net.Pipe()
defer cli.Close()
go ServeConn(srv)
dec := json.NewDecoder(cli)
fmt.Fprintf(cli, "{}")
var resp ArithAddResp
if err := dec.Decode(&resp); err != nil {
t.Fatalf("Decode after empty: %s", err)
}
if resp.Error == nil {
t.Fatalf("Expected error, got nil")
}
}
func TestServer(t *testing.T) {
cli, srv := net.Pipe()
defer cli.Close()
go ServeConn(srv)
dec := json.NewDecoder(cli)
// Send hand-coded requests to server, parse responses.
for i := 0; i < 10; i++ {
fmt.Fprintf(cli, `{"method": "Arith.Add", "id": "\u%04d", "params": [{"A": %d, "B": %d}]}`, i, i, i+1)
var resp ArithAddResp
err := dec.Decode(&resp)
if err != nil {
t.Fatalf("Decode: %s", err)
}
if resp.Error != nil {
t.Fatalf("resp.Error: %s", resp.Error)
}
if resp.Id.(string) != string(i) {
t.Fatalf("resp: bad id %q want %q", resp.Id.(string), string(i))
}
if resp.Result.C != 2*i+1 {
t.Fatalf("resp: bad result: %d+%d=%d", i, i+1, resp.Result.C)
}
}
}
func TestClient(t *testing.T) {
// Assume server is okay (TestServer is above).
// Test client against server.
cli, srv := net.Pipe()
go ServeConn(srv)
client := NewClient(cli)
defer client.Close()
// Synchronous calls
args := &Args{7, 8}
reply := new(Reply)
err := client.Call("Arith.Add", args, reply)
if err != nil {
t.Errorf("Add: expected no error but got string %q", err.Error())
}
if reply.C != args.A+args.B {
t.Errorf("Add: got %d expected %d", reply.C, args.A+args.B)
}
args = &Args{7, 8}
reply = new(Reply)
err = client.Call("Arith.Mul", args, reply)
if err != nil {
t.Errorf("Mul: expected no error but got string %q", err.Error())
}
if reply.C != args.A*args.B {
t.Errorf("Mul: got %d expected %d", reply.C, args.A*args.B)
}
// Out of order.
args = &Args{7, 8}
mulReply := new(Reply)
mulCall := client.Go("Arith.Mul", args, mulReply, nil)
addReply := new(Reply)
addCall := client.Go("Arith.Add", args, addReply, nil)
addCall = <-addCall.Done
if addCall.Error != nil {
t.Errorf("Add: expected no error but got string %q", addCall.Error.Error())
}
if addReply.C != args.A+args.B {
t.Errorf("Add: got %d expected %d", addReply.C, args.A+args.B)
}
mulCall = <-mulCall.Done
if mulCall.Error != nil {
t.Errorf("Mul: expected no error but got string %q", mulCall.Error.Error())
}
if mulReply.C != args.A*args.B {
t.Errorf("Mul: got %d expected %d", mulReply.C, args.A*args.B)
}
// Error test
args = &Args{7, 0}
reply = new(Reply)
err = client.Call("Arith.Div", args, reply)
// expect an error: zero divide
if err == nil {
t.Error("Div: expected error")
} else if err.Error() != "divide by zero" {
t.Error("Div: expected divide by zero error; got", err)
}
}
func TestMalformedInput(t *testing.T) {
cli, srv := net.Pipe()
go cli.Write([]byte(`{id:1}`)) // invalid json
ServeConn(srv) // must return, not loop
}
func TestMalformedOutput(t *testing.T) {
cli, srv := net.Pipe()
go srv.Write([]byte(`{"id":0,"result":null,"error":null}`))
go ioutil.ReadAll(srv)
client := NewClient(cli)
defer client.Close()
args := &Args{7, 8}
reply := new(Reply)
err := client.Call("Arith.Add", args, reply)
if err == nil {
t.Error("expected error")
}
}
func TestServerErrorHasNullResult(t *testing.T) {
var out bytes.Buffer
sc := NewServerCodec(struct {
io.Reader
io.Writer
io.Closer
}{
Reader: strings.NewReader(`{"method": "Arith.Add", "id": "123", "params": []}`),
Writer: &out,
Closer: ioutil.NopCloser(nil),
})
r := new(rpc.Request)
if err := sc.ReadRequestHeader(r); err != nil {
t.Fatal(err)
}
const valueText = "the value we don't want to see"
const errorText = "some error"
err := sc.WriteResponse(&rpc.Response{
ServiceMethod: "Method",
Seq: 1,
Error: errorText,
}, valueText)
if err != nil {
t.Fatal(err)
}
if !strings.Contains(out.String(), errorText) {
t.Fatalf("Response didn't contain expected error %q: %s", errorText, &out)
}
if strings.Contains(out.String(), valueText) {
t.Errorf("Response contains both an error and value: %s", &out)
}
}
func TestUnexpectedError(t *testing.T) {
cli, srv := myPipe()
go cli.PipeWriter.CloseWithError(errors.New("unexpected error!")) // reader will get this error
ServeConn(srv) // must return, not loop
}
// Copied from package net.
func myPipe() (*pipe, *pipe) {
r1, w1 := io.Pipe()
r2, w2 := io.Pipe()
return &pipe{r1, w2}, &pipe{r2, w1}
}
type pipe struct {
*io.PipeReader
*io.PipeWriter
}
type pipeAddr int
func (pipeAddr) Network() string {
return "pipe"
}
func (pipeAddr) String() string {
return "pipe"
}
func (p *pipe) Close() error {
err := p.PipeReader.Close()
err1 := p.PipeWriter.Close()
if err == nil {
err = err1
}
return err
}
func (p *pipe) LocalAddr() net.Addr {
return pipeAddr(0)
}
func (p *pipe) RemoteAddr() net.Addr {
return pipeAddr(0)
}
func (p *pipe) SetTimeout(nsec int64) error {
return errors.New("net.Pipe does not support timeouts")
}
func (p *pipe) SetReadTimeout(nsec int64) error {
return errors.New("net.Pipe does not support timeouts")
}
func (p *pipe) SetWriteTimeout(nsec int64) error {
return errors.New("net.Pipe does not support timeouts")
}
|
