github.com/pingcap/ticdc@v0.0.0-20220526033649-485a10ef2652/pkg/etcd/etcd.go (about)

     1  // Copyright 2020 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package etcd
    15  
    16  import (
    17  	"net/url"
    18  	"time"
    19  
    20  	"github.com/pingcap/errors"
    21  	"github.com/tikv/pd/pkg/tempurl"
    22  	"go.etcd.io/etcd/embed"
    23  )
    24  
    25  // getFreeListenURLs get free ports and localhost as url.
    26  func getFreeListenURLs(n int) (urls []*url.URL, retErr error) {
    27  	for i := 0; i < n; i++ {
    28  		u, err := url.Parse(tempurl.Alloc())
    29  		if err != nil {
    30  			retErr = errors.Trace(err)
    31  			return
    32  		}
    33  		urls = append(urls, u)
    34  	}
    35  
    36  	return
    37  }
    38  
    39  // SetupEmbedEtcd starts an embed etcd server
    40  func SetupEmbedEtcd(dir string) (clientURL *url.URL, e *embed.Etcd, err error) {
    41  	cfg := embed.NewConfig()
    42  	cfg.Dir = dir
    43  
    44  	urls, err := getFreeListenURLs(2)
    45  	if err != nil {
    46  		return
    47  	}
    48  	cfg.LPUrls = []url.URL{*urls[0]}
    49  	cfg.LCUrls = []url.URL{*urls[1]}
    50  	cfg.Logger = "zap"
    51  	cfg.LogLevel = "error"
    52  	clientURL = urls[1]
    53  
    54  	e, err = embed.StartEtcd(cfg)
    55  	if err != nil {
    56  		return
    57  	}
    58  
    59  	select {
    60  	case <-e.Server.ReadyNotify():
    61  	case <-time.After(60 * time.Second):
    62  		e.Server.Stop() // trigger a shutdown
    63  		err = errors.New("server took too long to start")
    64  	}
    65  
    66  	return
    67  }