summaryrefslogtreecommitdiff
path: root/libgo/go/old/netchan/netchan_test.go
blob: 53f0f78776566958c71ab3994cf5124603cf8e6b (plain)
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
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
// 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 netchan

import (
	"net"
	"strings"
	"testing"
	"time"
)

const count = 10     // number of items in most tests
const closeCount = 5 // number of items when sender closes early

const base = 23

func exportSend(exp *Exporter, n int, t *testing.T, done chan bool) {
	ch := make(chan int)
	err := exp.Export("exportedSend", ch, Send)
	if err != nil {
		t.Fatal("exportSend:", err)
	}
	go func() {
		for i := 0; i < n; i++ {
			ch <- base + i
		}
		close(ch)
		if done != nil {
			done <- true
		}
	}()
}

func exportReceive(exp *Exporter, t *testing.T, expDone chan bool) {
	ch := make(chan int)
	err := exp.Export("exportedRecv", ch, Recv)
	expDone <- true
	if err != nil {
		t.Fatal("exportReceive:", err)
	}
	for i := 0; i < count; i++ {
		v, ok := <-ch
		if !ok {
			if i != closeCount {
				t.Errorf("exportReceive expected close at %d; got one at %d", closeCount, i)
			}
			break
		}
		if v != base+i {
			t.Errorf("export Receive: bad value: expected %d+%d=%d; got %d", base, i, base+i, v)
		}
	}
}

func importSend(imp *Importer, n int, t *testing.T, done chan bool) {
	ch := make(chan int)
	err := imp.ImportNValues("exportedRecv", ch, Send, 3, -1)
	if err != nil {
		t.Fatal("importSend:", err)
	}
	go func() {
		for i := 0; i < n; i++ {
			ch <- base + i
		}
		close(ch)
		if done != nil {
			done <- true
		}
	}()
}

func importReceive(imp *Importer, t *testing.T, done chan bool) {
	ch := make(chan int)
	err := imp.ImportNValues("exportedSend", ch, Recv, 3, count)
	if err != nil {
		t.Fatal("importReceive:", err)
	}
	for i := 0; i < count; i++ {
		v, ok := <-ch
		if !ok {
			if i != closeCount {
				t.Errorf("importReceive expected close at %d; got one at %d", closeCount, i)
			}
			break
		}
		if v != base+i {
			t.Errorf("importReceive: bad value: expected %d+%d=%d; got %+d", base, i, base+i, v)
		}
	}
	if done != nil {
		done <- true
	}
}

func TestExportSendImportReceive(t *testing.T) {
	exp, imp := pair(t)
	exportSend(exp, count, t, nil)
	importReceive(imp, t, nil)
}

func TestExportReceiveImportSend(t *testing.T) {
	exp, imp := pair(t)
	expDone := make(chan bool)
	done := make(chan bool)
	go func() {
		exportReceive(exp, t, expDone)
		done <- true
	}()
	<-expDone
	importSend(imp, count, t, nil)
	<-done
}

func TestClosingExportSendImportReceive(t *testing.T) {
	exp, imp := pair(t)
	exportSend(exp, closeCount, t, nil)
	importReceive(imp, t, nil)
}

func TestClosingImportSendExportReceive(t *testing.T) {
	exp, imp := pair(t)
	expDone := make(chan bool)
	done := make(chan bool)
	go func() {
		exportReceive(exp, t, expDone)
		done <- true
	}()
	<-expDone
	importSend(imp, closeCount, t, nil)
	<-done
}

func TestErrorForIllegalChannel(t *testing.T) {
	exp, imp := pair(t)
	// Now export a channel.
	ch := make(chan int, 1)
	err := exp.Export("aChannel", ch, Send)
	if err != nil {
		t.Fatal("export:", err)
	}
	ch <- 1234
	close(ch)
	// Now try to import a different channel.
	ch = make(chan int)
	err = imp.Import("notAChannel", ch, Recv, 1)
	if err != nil {
		t.Fatal("import:", err)
	}
	// Expect an error now.  Start a timeout.
	timeout := make(chan bool, 1) // buffered so closure will not hang around.
	go func() {
		time.Sleep(10 * time.Second) // very long, to give even really slow machines a chance.
		timeout <- true
	}()
	select {
	case err = <-imp.Errors():
		if strings.Index(err.Error(), "no such channel") < 0 {
			t.Error("wrong error for nonexistent channel:", err)
		}
	case <-timeout:
		t.Error("import of nonexistent channel did not receive an error")
	}
}

// Not a great test but it does at least invoke Drain.
func TestExportDrain(t *testing.T) {
	exp, imp := pair(t)
	done := make(chan bool)
	go func() {
		exportSend(exp, closeCount, t, nil)
		done <- true
	}()
	<-done
	go importReceive(imp, t, done)
	exp.Drain(0)
	<-done
}

// Not a great test but it does at least invoke Drain.
func TestImportDrain(t *testing.T) {
	exp, imp := pair(t)
	expDone := make(chan bool)
	go exportReceive(exp, t, expDone)
	<-expDone
	importSend(imp, closeCount, t, nil)
	imp.Drain(0)
}

// Not a great test but it does at least invoke Sync.
func TestExportSync(t *testing.T) {
	exp, imp := pair(t)
	done := make(chan bool)
	exportSend(exp, closeCount, t, nil)
	go importReceive(imp, t, done)
	exp.Sync(0)
	<-done
}

// Test hanging up the send side of an export.
// TODO: test hanging up the receive side of an export.
func TestExportHangup(t *testing.T) {
	exp, imp := pair(t)
	ech := make(chan int)
	err := exp.Export("exportedSend", ech, Send)
	if err != nil {
		t.Fatal("export:", err)
	}
	// Prepare to receive two values. We'll actually deliver only one.
	ich := make(chan int)
	err = imp.ImportNValues("exportedSend", ich, Recv, 1, 2)
	if err != nil {
		t.Fatal("import exportedSend:", err)
	}
	// Send one value, receive it.
	const Value = 1234
	ech <- Value
	v := <-ich
	if v != Value {
		t.Fatal("expected", Value, "got", v)
	}
	// Now hang up the channel.  Importer should see it close.
	exp.Hangup("exportedSend")
	v, ok := <-ich
	if ok {
		t.Fatal("expected channel to be closed; got value", v)
	}
}

// Test hanging up the send side of an import.
// TODO: test hanging up the receive side of an import.
func TestImportHangup(t *testing.T) {
	exp, imp := pair(t)
	ech := make(chan int)
	err := exp.Export("exportedRecv", ech, Recv)
	if err != nil {
		t.Fatal("export:", err)
	}
	// Prepare to Send two values. We'll actually deliver only one.
	ich := make(chan int)
	err = imp.ImportNValues("exportedRecv", ich, Send, 1, 2)
	if err != nil {
		t.Fatal("import exportedRecv:", err)
	}
	// Send one value, receive it.
	const Value = 1234
	ich <- Value
	v := <-ech
	if v != Value {
		t.Fatal("expected", Value, "got", v)
	}
	// Now hang up the channel.  Exporter should see it close.
	imp.Hangup("exportedRecv")
	v, ok := <-ech
	if ok {
		t.Fatal("expected channel to be closed; got value", v)
	}
}

// loop back exportedRecv to exportedSend,
// but receive a value from ctlch before starting the loop.
func exportLoopback(exp *Exporter, t *testing.T) {
	inch := make(chan int)
	if err := exp.Export("exportedRecv", inch, Recv); err != nil {
		t.Fatal("exportRecv")
	}

	outch := make(chan int)
	if err := exp.Export("exportedSend", outch, Send); err != nil {
		t.Fatal("exportSend")
	}

	ctlch := make(chan int)
	if err := exp.Export("exportedCtl", ctlch, Recv); err != nil {
		t.Fatal("exportRecv")
	}

	go func() {
		<-ctlch
		for i := 0; i < count; i++ {
			x := <-inch
			if x != base+i {
				t.Errorf("exportLoopback expected %d; got %d", i, x)
			}
			outch <- x
		}
	}()
}

// This test checks that channel operations can proceed
// even when other concurrent operations are blocked.
func TestIndependentSends(t *testing.T) {
	exp, imp := pair(t)

	exportLoopback(exp, t)

	importSend(imp, count, t, nil)
	done := make(chan bool)
	go importReceive(imp, t, done)

	// wait for export side to try to deliver some values.
	time.Sleep(250 * time.Millisecond)

	ctlch := make(chan int)
	if err := imp.ImportNValues("exportedCtl", ctlch, Send, 1, 1); err != nil {
		t.Fatal("importSend:", err)
	}
	ctlch <- 0

	<-done
}

// This test cross-connects a pair of exporter/importer pairs.
type value struct {
	I      int
	Source string
}

func TestCrossConnect(t *testing.T) {
	e1, i1 := pair(t)
	e2, i2 := pair(t)

	crossExport(e1, e2, t)
	crossImport(i1, i2, t)
}

// Export side of cross-traffic.
func crossExport(e1, e2 *Exporter, t *testing.T) {
	s := make(chan value)
	err := e1.Export("exportedSend", s, Send)
	if err != nil {
		t.Fatal("exportSend:", err)
	}

	r := make(chan value)
	err = e2.Export("exportedReceive", r, Recv)
	if err != nil {
		t.Fatal("exportReceive:", err)
	}

	go crossLoop("export", s, r, t)
}

// Import side of cross-traffic.
func crossImport(i1, i2 *Importer, t *testing.T) {
	s := make(chan value)
	err := i2.Import("exportedReceive", s, Send, 2)
	if err != nil {
		t.Fatal("import of exportedReceive:", err)
	}

	r := make(chan value)
	err = i1.Import("exportedSend", r, Recv, 2)
	if err != nil {
		t.Fatal("import of exported Send:", err)
	}

	crossLoop("import", s, r, t)
}

// Cross-traffic: send and receive 'count' numbers.
func crossLoop(name string, s, r chan value, t *testing.T) {
	for si, ri := 0, 0; si < count && ri < count; {
		select {
		case s <- value{si, name}:
			si++
		case v := <-r:
			if v.I != ri {
				t.Errorf("loop: bad value: expected %d, hello; got %+v", ri, v)
			}
			ri++
		}
	}
}

const flowCount = 100

// test flow control from exporter to importer.
func TestExportFlowControl(t *testing.T) {
	exp, imp := pair(t)

	sendDone := make(chan bool, 1)
	exportSend(exp, flowCount, t, sendDone)

	ch := make(chan int)
	err := imp.ImportNValues("exportedSend", ch, Recv, 20, -1)
	if err != nil {
		t.Fatal("importReceive:", err)
	}

	testFlow(sendDone, ch, flowCount, t)
}

// test flow control from importer to exporter.
func TestImportFlowControl(t *testing.T) {
	exp, imp := pair(t)

	ch := make(chan int)
	err := exp.Export("exportedRecv", ch, Recv)
	if err != nil {
		t.Fatal("importReceive:", err)
	}

	sendDone := make(chan bool, 1)
	importSend(imp, flowCount, t, sendDone)
	testFlow(sendDone, ch, flowCount, t)
}

func testFlow(sendDone chan bool, ch <-chan int, N int, t *testing.T) {
	go func() {
		time.Sleep(500 * time.Millisecond)
		sendDone <- false
	}()

	if <-sendDone {
		t.Fatal("send did not block")
	}
	n := 0
	for i := range ch {
		t.Log("after blocking, got value ", i)
		n++
	}
	if n != N {
		t.Fatalf("expected %d values; got %d", N, n)
	}
}

func pair(t *testing.T) (*Exporter, *Importer) {
	c0, c1 := net.Pipe()
	exp := NewExporter()
	go exp.ServeConn(c0)
	imp := NewImporter(c1)
	return exp, imp
}