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tempurl.go
60 lines (53 loc) · 1.25 KB
/
tempurl.go
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// Copyright 2018 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 tempurl
import (
"fmt"
"net"
"sync"
"time"
log "github.com/sirupsen/logrus"
)
var (
testAddrMutex sync.Mutex
testAddrMap = make(map[string]struct{})
)
// Alloc allocates a local URL for testing.
func Alloc() 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
}