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// Copyright 2014 Google Inc. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
// +build !appengine
package internal
import (
"sync"
"testing"
"time"
netcontext "golang.org/x/net/context"
basepb "google.golang.org/appengine/internal/base"
)
func TestDialLimit(t *testing.T) {
// Fill up semaphore with false acquisitions to permit only two TCP connections at a time.
// We don't replace limitSem because that results in a data race when net/http lazily closes connections.
nFake := cap(limitSem) - 2
for i := 0; i < nFake; i++ {
limitSem <- 1
}
defer func() {
for i := 0; i < nFake; i++ {
<-limitSem
}
}()
f, c, cleanup := setup() // setup is in api_test.go
defer cleanup()
f.hang = make(chan int)
// If we make two RunSlowly RPCs (which will wait for f.hang to be strobed),
// then the simple Non200 RPC should hang.
var wg sync.WaitGroup
wg.Add(2)
for i := 0; i < 2; i++ {
go func() {
defer wg.Done()
Call(toContext(c), "errors", "RunSlowly", &basepb.VoidProto{}, &basepb.VoidProto{})
}()
}
time.Sleep(50 * time.Millisecond) // let those two RPCs start
ctx, _ := netcontext.WithTimeout(toContext(c), 50*time.Millisecond)
err := Call(ctx, "errors", "Non200", &basepb.VoidProto{}, &basepb.VoidProto{})
if err != errTimeout {
t.Errorf("Non200 RPC returned with err %v, want errTimeout", err)
}
// Drain the two RunSlowly calls.
f.hang <- 1
f.hang <- 1
wg.Wait()
}
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