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testutil.go
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testutil.go
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// Copyright 2016 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package testutil
import (
"fmt"
"net"
"sync"
"time"
log "github.com/Sirupsen/logrus"
check "github.com/pingcap/check"
)
var (
testAddrMutex sync.Mutex
testAddrMap = make(map[string]struct{})
)
// AllocTestURL allocates a local URL for testing.
func AllocTestURL() string {
for i := 0; i < 10; i++ {
if u := tryAllocTestURL(); u != "" {
return u
}
time.Sleep(time.Second)
}
log.Fatal("failed to alloc test URL")
return ""
}
func tryAllocTestURL() string {
l, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
log.Fatal(err)
}
addr := fmt.Sprintf("http://%s", l.Addr())
err = l.Close()
if err != nil {
log.Fatal(err)
}
testAddrMutex.Lock()
defer testAddrMutex.Unlock()
if _, ok := testAddrMap[addr]; ok {
return ""
}
testAddrMap[addr] = struct{}{}
return addr
}
const (
waitMaxRetry = 100
waitRetrySleep = time.Millisecond * 50
)
// CheckFunc is a condition checker that passed to WaitUntil. Its implementation
// may call c.Fatal() to abort the test, or c.Log() to add more information.
type CheckFunc func(c *check.C) bool
// WaitUntil repeatly evaluates f() for a period of time, util it returns true.
func WaitUntil(c *check.C, f CheckFunc) {
c.Log("wait start")
for i := 0; i < waitMaxRetry; i++ {
if f(c) {
return
}
time.Sleep(waitRetrySleep)
}
c.Fatal("wait timeout")
}