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mysqlctld.go
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mysqlctld.go
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// Copyright 2014, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// mysqlctld is a daemon that starts or initializes mysqld and provides an RPC
// interface for vttablet to stop and start mysqld from a different container
// without having to restart the container running mysqlctld.
package main
import (
"flag"
"os"
"time"
log "github.com/golang/glog"
"github.com/youtube/vitess/go/exit"
"github.com/youtube/vitess/go/vt/dbconfigs"
"github.com/youtube/vitess/go/vt/logutil"
"github.com/youtube/vitess/go/vt/mysqlctl"
"github.com/youtube/vitess/go/vt/servenv"
"golang.org/x/net/context"
// import mysql to register mysql connection function
_ "github.com/youtube/vitess/go/mysql"
)
var (
// mysqld is used by the rpc implementation plugin.
mysqld *mysqlctl.Mysqld
mysqlPort = flag.Int("mysql_port", 3306, "mysql port")
tabletUID = flag.Uint("tablet_uid", 41983, "tablet uid")
mysqlSocket = flag.String("mysql_socket", "", "path to the mysql socket")
// mysqlctl init flags
waitTime = flag.Duration("wait_time", 2*time.Minute, "how long to wait for mysqld startup or shutdown")
bootstrapArchive = flag.String("bootstrap_archive", "mysql-db-dir.tbz", "name of bootstrap archive within vitess/data/bootstrap directory")
)
func init() {
servenv.RegisterDefaultFlags()
servenv.RegisterDefaultSocketFileFlags()
}
func main() {
defer exit.Recover()
defer logutil.Flush()
flags := dbconfigs.AppConfig | dbconfigs.DbaConfig |
dbconfigs.FilteredConfig | dbconfigs.ReplConfig
dbconfigs.RegisterFlags(flags)
flag.Parse()
mycnf := mysqlctl.NewMycnf(uint32(*tabletUID), int32(*mysqlPort))
if *mysqlSocket != "" {
mycnf.SocketFile = *mysqlSocket
}
dbcfgs, err := dbconfigs.Init(mycnf.SocketFile, flags)
if err != nil {
log.Errorf("%v", err)
exit.Return(255)
}
mysqld = mysqlctl.NewMysqld("Dba", "App", mycnf, &dbcfgs.Dba, &dbcfgs.App.ConnParams, &dbcfgs.Repl)
// Register OnTerm handler before mysqld starts, so we get notified if mysqld
// dies on its own without us (or our RPC client) telling it to.
mysqldTerminated := make(chan struct{})
mysqld.OnTerm(func() {
close(mysqldTerminated)
})
// Start or Init mysqld as needed.
ctx, cancel := context.WithTimeout(context.Background(), *waitTime)
if _, err = os.Stat(mycnf.DataDir); os.IsNotExist(err) {
log.Infof("mysql data dir (%s) doesn't exist, initializing", mycnf.DataDir)
mysqld.Init(ctx, *bootstrapArchive)
} else {
log.Infof("mysql data dir (%s) already exists, starting without init", mycnf.DataDir)
mysqld.Start(ctx)
}
cancel()
servenv.Init()
defer servenv.Close()
// Take mysqld down with us on SIGTERM before entering lame duck.
servenv.OnTerm(func() {
log.Infof("mysqlctl received SIGTERM, shutting down mysqld first")
ctx := context.Background()
mysqld.Shutdown(ctx, false)
})
// Start RPC server and wait for SIGTERM.
mysqlctldTerminated := make(chan struct{})
go func() {
servenv.RunDefault()
close(mysqlctldTerminated)
}()
select {
case <-mysqldTerminated:
log.Infof("mysqld shut down on its own, exiting mysqlctld")
case <-mysqlctldTerminated:
log.Infof("mysqlctld shut down gracefully")
}
}