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// 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) {
if testing.Short() {
t.Logf("disabled test during -short")
return
}
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) {
if testing.Short() {
t.Logf("disabled test during -short")
return
}
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) {
if testing.Short() {
t.Logf("disabled test during -short")
return
}
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
}