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mysqld.go
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mysqld.go
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// Copyright 2012, 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.
/*
Commands for controlling an external mysql process.
Some commands are issued as exec'd tools, some are handled by connecting via
the mysql protocol.
*/
package mysqlctl
import (
"bufio"
"errors"
"flag"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path"
"path/filepath"
"strings"
"sync"
"time"
log "github.com/golang/glog"
"github.com/youtube/vitess/go/sqldb"
"github.com/youtube/vitess/go/stats"
"github.com/youtube/vitess/go/vt/dbconfigs"
"github.com/youtube/vitess/go/vt/dbconnpool"
vtenv "github.com/youtube/vitess/go/vt/env"
"github.com/youtube/vitess/go/vt/hook"
"github.com/youtube/vitess/go/vt/mysqlctl/mysqlctlclient"
"golang.org/x/net/context"
)
var (
dbaPoolSize = flag.Int("dba_pool_size", 20, "Size of the connection pool for dba connections")
dbaIdleTimeout = flag.Duration("dba_idle_timeout", time.Minute, "Idle timeout for dba connections")
appPoolSize = flag.Int("app_pool_size", 40, "Size of the connection pool for app connections")
appIdleTimeout = flag.Duration("app_idle_timeout", time.Minute, "Idle timeout for app connections")
socketFile = flag.String("mysqlctl_socket", "", "socket file to use for remote mysqlctl actions (empty for local actions)")
// masterConnectRetry is used in 'SET MASTER' commands
masterConnectRetry = flag.Duration("master_connect_retry", 10*time.Second, "how long to wait in between slave -> connection attempts. Only precise to the second.")
)
// Mysqld is the object that represents a mysqld daemon running on this server.
type Mysqld struct {
config *Mycnf
dba *sqldb.ConnParams
dbApp *sqldb.ConnParams
dbaPool *dbconnpool.ConnectionPool
appPool *dbconnpool.ConnectionPool
replParams *sqldb.ConnParams
dbaMysqlStats *stats.Timings
TabletDir string
SnapshotDir string
// mutex protects the fields below.
mutex sync.Mutex
mysqlFlavor MysqlFlavor
onTermFuncs []func()
cancelWaitCmd chan struct{}
}
// NewMysqld creates a Mysqld object based on the provided configuration
// and connection parameters.
// dbaName and appName are the base for stats exports, use 'Dba' and 'App', except in tests
func NewMysqld(dbaName, appName string, config *Mycnf, dba, app, repl *sqldb.ConnParams) *Mysqld {
if *dba == dbconfigs.DefaultDBConfigs.Dba {
dba.UnixSocket = config.SocketFile
}
// create and open the connection pool for dba access
dbaMysqlStatsName := ""
dbaPoolName := ""
if dbaName != "" {
dbaMysqlStatsName = "Mysql" + dbaName
dbaPoolName = dbaName + "ConnPool"
}
dbaMysqlStats := stats.NewTimings(dbaMysqlStatsName)
dbaPool := dbconnpool.NewConnectionPool(dbaPoolName, *dbaPoolSize, *dbaIdleTimeout)
dbaPool.Open(dbconnpool.DBConnectionCreator(dba, dbaMysqlStats))
// create and open the connection pool for app access
appMysqlStatsName := ""
appPoolName := ""
if appName != "" {
appMysqlStatsName = "Mysql" + appName
appPoolName = appName + "ConnPool"
}
appMysqlStats := stats.NewTimings(appMysqlStatsName)
appPool := dbconnpool.NewConnectionPool(appPoolName, *appPoolSize, *appIdleTimeout)
appPool.Open(dbconnpool.DBConnectionCreator(app, appMysqlStats))
return &Mysqld{
config: config,
dba: dba,
dbApp: app,
dbaPool: dbaPool,
appPool: appPool,
replParams: repl,
dbaMysqlStats: dbaMysqlStats,
TabletDir: TabletDir(config.ServerID),
SnapshotDir: SnapshotDir(config.ServerID),
}
}
// Cnf returns the mysql config for the daemon
func (mysqld *Mysqld) Cnf() *Mycnf {
return mysqld.config
}
// RunMysqlUpgrade will run the mysql_upgrade program on the current install.
// Will not be called when mysqld is running.
func (mysqld *Mysqld) RunMysqlUpgrade() error {
// Execute as remote action on mysqlctld if requested.
if *socketFile != "" {
log.Infof("executing Mysqld.RunMysqlUpgrade() remotely via mysqlctld server: %v", *socketFile)
client, err := mysqlctlclient.New("unix", *socketFile)
if err != nil {
return fmt.Errorf("can't dial mysqlctld: %v", err)
}
defer client.Close()
return client.RunMysqlUpgrade(context.TODO())
}
// find mysql_upgrade. If not there, we do nothing.
dir, err := vtenv.VtMysqlRoot()
if err != nil {
log.Warningf("VT_MYSQL_ROOT not set, skipping mysql_upgrade step: %v", err)
return nil
}
name := path.Join(dir, "bin/mysql_upgrade")
if _, err := os.Stat(name); err != nil {
log.Warningf("mysql_upgrade binary not present, skipping it: %v", err)
return nil
}
// run the program, if it fails, we fail
args := []string{
// --defaults-file=* must be the first arg.
"--defaults-file=" + mysqld.config.path,
"--socket", mysqld.config.SocketFile,
"--user", mysqld.dba.Uname,
"--force", // Don't complain if it's already been upgraded.
}
if mysqld.dba.Pass != "" {
// --password must be omitted entirely if empty, or else it will prompt.
args = append(args, "--password", mysqld.dba.Pass)
}
cmd := exec.Command(name, args...)
cmd.Env = []string{os.ExpandEnv("LD_LIBRARY_PATH=$VT_MYSQL_ROOT/lib/mysql")}
out, err := cmd.CombinedOutput()
log.Infof("mysql_upgrade output: %s", out)
return err
}
// Start will start the mysql daemon, either by running the 'mysqld_start'
// hook, or by running mysqld_safe in the background.
// If a mysqlctld address is provided in a flag, Start will run remotely.
func (mysqld *Mysqld) Start(ctx context.Context) error {
// Execute as remote action on mysqlctld if requested.
if *socketFile != "" {
log.Infof("executing Mysqld.Start() remotely via mysqlctld server: %v", *socketFile)
client, err := mysqlctlclient.New("unix", *socketFile)
if err != nil {
return fmt.Errorf("can't dial mysqlctld: %v", err)
}
defer client.Close()
return client.Start(ctx)
}
var name string
ts := fmt.Sprintf("Mysqld.Start(%v)", time.Now().Unix())
// try the mysqld start hook, if any
switch hr := hook.NewSimpleHook("mysqld_start").Execute(); hr.ExitStatus {
case hook.HOOK_SUCCESS:
// hook exists and worked, we can keep going
name = "mysqld_start hook"
case hook.HOOK_DOES_NOT_EXIST:
// hook doesn't exist, run mysqld_safe ourselves
log.Infof("%v: No mysqld_start hook, running mysqld_safe directly", ts)
dir, err := vtenv.VtMysqlRoot()
if err != nil {
return err
}
name = path.Join(dir, "bin/mysqld_safe")
arg := []string{
"--defaults-file=" + mysqld.config.path}
env := []string{os.ExpandEnv("LD_LIBRARY_PATH=$VT_MYSQL_ROOT/lib/mysql")}
cmd := exec.Command(name, arg...)
cmd.Dir = dir
cmd.Env = env
log.Infof("%v %#v", ts, cmd)
stderr, err := cmd.StderrPipe()
if err != nil {
return nil
}
stdout, err := cmd.StdoutPipe()
if err != nil {
return nil
}
go func() {
scanner := bufio.NewScanner(stderr)
for scanner.Scan() {
log.Infof("%v stderr: %v", ts, scanner.Text())
}
}()
go func() {
scanner := bufio.NewScanner(stdout)
for scanner.Scan() {
log.Infof("%v stdout: %v", ts, scanner.Text())
}
}()
err = cmd.Start()
if err != nil {
return nil
}
mysqld.mutex.Lock()
mysqld.cancelWaitCmd = make(chan struct{})
go func(cancel <-chan struct{}) {
// Wait regardless of cancel, so we don't generate defunct processes.
err := cmd.Wait()
log.Infof("%v exit: %v", ts, err)
// The process exited. Trigger OnTerm callbacks, unless we were cancelled.
select {
case <-cancel:
default:
mysqld.mutex.Lock()
for _, callback := range mysqld.onTermFuncs {
go callback()
}
mysqld.mutex.Unlock()
}
}(mysqld.cancelWaitCmd)
mysqld.mutex.Unlock()
default:
// hook failed, we report error
return fmt.Errorf("mysqld_start hook failed: %v", hr.String())
}
// give it some time to succeed - usually by the time the socket emerges
// we are in good shape
for {
select {
case <-ctx.Done():
return errors.New(name + ": deadline exceeded waiting for " + mysqld.config.SocketFile)
default:
}
_, statErr := os.Stat(mysqld.config.SocketFile)
if statErr == nil {
// Make sure the socket file isn't stale.
conn, connErr := mysqld.dbaPool.Get(0)
if connErr == nil {
conn.Recycle()
return nil
}
} else if !os.IsNotExist(statErr) {
return statErr
}
log.Infof("%v: sleeping for 1s waiting for socket file %v", ts, mysqld.config.SocketFile)
time.Sleep(time.Second)
}
}
// Shutdown will stop the mysqld daemon that is running in the background.
//
// waitForMysqld: should the function block until mysqld has stopped?
// This can actually take a *long* time if the buffer cache needs to be fully
// flushed - on the order of 20-30 minutes.
//
// If a mysqlctld address is provided in a flag, Shutdown will run remotely.
func (mysqld *Mysqld) Shutdown(ctx context.Context, waitForMysqld bool) error {
log.Infof("Mysqld.Shutdown")
// Execute as remote action on mysqlctld if requested.
if *socketFile != "" {
log.Infof("executing Mysqld.Shutdown() remotely via mysqlctld server: %v", *socketFile)
client, err := mysqlctlclient.New("unix", *socketFile)
if err != nil {
return fmt.Errorf("can't dial mysqlctld: %v", err)
}
defer client.Close()
return client.Shutdown(ctx, waitForMysqld)
}
// We're shutting down on purpose. We no longer want to be notified when
// mysqld terminates.
mysqld.mutex.Lock()
if mysqld.cancelWaitCmd != nil {
close(mysqld.cancelWaitCmd)
mysqld.cancelWaitCmd = nil
}
mysqld.mutex.Unlock()
// possibly mysql is already shutdown, check for a few files first
_, socketPathErr := os.Stat(mysqld.config.SocketFile)
_, pidPathErr := os.Stat(mysqld.config.PidFile)
if socketPathErr != nil && pidPathErr != nil {
log.Warningf("assuming mysqld already shut down - no socket, no pid file found")
return nil
}
// try the mysqld shutdown hook, if any
h := hook.NewSimpleHook("mysqld_shutdown")
hr := h.Execute()
switch hr.ExitStatus {
case hook.HOOK_SUCCESS:
// hook exists and worked, we can keep going
case hook.HOOK_DOES_NOT_EXIST:
// hook doesn't exist, try mysqladmin
log.Infof("No mysqld_shutdown hook, running mysqladmin directly")
dir, err := vtenv.VtMysqlRoot()
if err != nil {
return err
}
name := path.Join(dir, "bin/mysqladmin")
arg := []string{
"-u", "vt_dba", "-S", mysqld.config.SocketFile,
"shutdown"}
env := []string{
os.ExpandEnv("LD_LIBRARY_PATH=$VT_MYSQL_ROOT/lib/mysql"),
}
_, err = execCmd(name, arg, env, dir)
if err != nil {
return err
}
default:
// hook failed, we report error
return fmt.Errorf("mysqld_shutdown hook failed: %v", hr.String())
}
// Wait for mysqld to really stop. Use the sock file as a
// proxy for that since we can't call wait() in a process we
// didn't start.
if waitForMysqld {
for {
select {
case <-ctx.Done():
return errors.New("gave up waiting for mysqld to stop")
default:
}
_, statErr := os.Stat(mysqld.config.SocketFile)
if statErr != nil && os.IsNotExist(statErr) {
return nil
}
log.Infof("Mysqld.Shutdown: sleeping for 1s waiting for socket file %v", mysqld.config.SocketFile)
time.Sleep(time.Second)
}
}
return nil
}
/* exec and wait for a return code. look for name in $PATH. */
func execCmd(name string, args, env []string, dir string) (cmd *exec.Cmd, err error) {
cmdPath, _ := exec.LookPath(name)
log.Infof("execCmd: %v %v %v", name, cmdPath, args)
cmd = exec.Command(cmdPath, args...)
cmd.Env = env
cmd.Dir = dir
output, err := cmd.CombinedOutput()
if err != nil {
err = errors.New(name + ": " + string(output))
}
log.Infof("execCmd: command returned: %v", string(output))
return cmd, err
}
// Init will create the default directory structure for the mysqld process,
// generate / configure a my.cnf file, unpack a skeleton database,
// and create some management tables.
func (mysqld *Mysqld) Init(ctx context.Context, bootstrapArchive string) error {
log.Infof("mysqlctl.Init")
err := mysqld.createDirs()
if err != nil {
log.Errorf("%s", err.Error())
return err
}
root, err := vtenv.VtRoot()
if err != nil {
log.Errorf("%s", err.Error())
return err
}
// Set up config files.
if err = mysqld.initConfig(root); err != nil {
log.Errorf("failed creating %v: %v", mysqld.config.path, err)
return err
}
// Unpack bootstrap DB files.
dbTbzPath := path.Join(root, "data/bootstrap/"+bootstrapArchive)
log.Infof("decompress bootstrap db %v", dbTbzPath)
args := []string{"-xj", "-C", mysqld.TabletDir, "-f", dbTbzPath}
if _, err = execCmd("tar", args, []string{}, ""); err != nil {
log.Errorf("failed unpacking %v: %v", dbTbzPath, err)
return err
}
// Start mysqld.
if err = mysqld.Start(ctx); err != nil {
log.Errorf("failed starting, check %v", mysqld.config.ErrorLogPath)
return err
}
return nil
}
func (mysqld *Mysqld) initConfig(root string) error {
var err error
var configData string
switch hr := hook.NewSimpleHook("make_mycnf").Execute(); hr.ExitStatus {
case hook.HOOK_DOES_NOT_EXIST:
log.Infof("make_mycnf hook doesn't exist, reading default template files")
cnfTemplatePaths := []string{
path.Join(root, "config/mycnf/default.cnf"),
path.Join(root, "config/mycnf/master.cnf"),
path.Join(root, "config/mycnf/replica.cnf"),
}
if extraCnf := os.Getenv("EXTRA_MY_CNF"); extraCnf != "" {
parts := strings.Split(extraCnf, ":")
cnfTemplatePaths = append(cnfTemplatePaths, parts...)
}
configData, err = mysqld.config.makeMycnf(cnfTemplatePaths)
case hook.HOOK_SUCCESS:
configData, err = mysqld.config.fillMycnfTemplate(hr.Stdout)
default:
return fmt.Errorf("make_mycnf hook failed(%v): %v", hr.ExitStatus, hr.Stderr)
}
if err != nil {
return err
}
return ioutil.WriteFile(mysqld.config.path, []byte(configData), 0664)
}
func (mysqld *Mysqld) createDirs() error {
log.Infof("creating directory %s", mysqld.TabletDir)
if err := os.MkdirAll(mysqld.TabletDir, os.ModePerm); err != nil {
return err
}
for _, dir := range TopLevelDirs() {
if err := mysqld.createTopDir(dir); err != nil {
return err
}
}
for _, dir := range mysqld.config.directoryList() {
log.Infof("creating directory %s", dir)
if err := os.MkdirAll(dir, os.ModePerm); err != nil {
return err
}
// FIXME(msolomon) validate permissions?
}
return nil
}
// createTopDir creates a top level directory under TabletDir.
// However, if a directory of the same name already exists under
// vtenv.VtDataRoot(), it creates a directory named after the tablet
// id under that directory, and then creates a symlink under TabletDir
// that points to the newly created directory. For example, if
// /vt/data is present, it will create the following structure:
// /vt/data/vt_xxxx /vt/vt_xxxx/data -> /vt/data/vt_xxxx
func (mysqld *Mysqld) createTopDir(dir string) error {
vtname := path.Base(mysqld.TabletDir)
target := path.Join(vtenv.VtDataRoot(), dir)
_, err := os.Lstat(target)
if err != nil {
if os.IsNotExist(err) {
topdir := path.Join(mysqld.TabletDir, dir)
log.Infof("creating directory %s", topdir)
return os.MkdirAll(topdir, os.ModePerm)
}
return err
}
linkto := path.Join(target, vtname)
source := path.Join(mysqld.TabletDir, dir)
log.Infof("creating directory %s", linkto)
err = os.MkdirAll(linkto, os.ModePerm)
if err != nil {
return err
}
log.Infof("creating symlink %s -> %s", source, linkto)
return os.Symlink(linkto, source)
}
// Teardown will shutdown the running daemon, and delete the root directory.
func (mysqld *Mysqld) Teardown(ctx context.Context, force bool) error {
log.Infof("mysqlctl.Teardown")
if err := mysqld.Shutdown(ctx, true); err != nil {
log.Warningf("failed mysqld shutdown: %v", err.Error())
if !force {
return err
}
}
var removalErr error
for _, dir := range TopLevelDirs() {
qdir := path.Join(mysqld.TabletDir, dir)
if err := deleteTopDir(qdir); err != nil {
removalErr = err
}
}
return removalErr
}
func deleteTopDir(dir string) (removalErr error) {
fi, err := os.Lstat(dir)
if err != nil {
log.Errorf("error deleting dir %v: %v", dir, err.Error())
removalErr = err
} else if fi.Mode()&os.ModeSymlink != 0 {
target, err := filepath.EvalSymlinks(dir)
if err != nil {
log.Errorf("could not resolve symlink %v: %v", dir, err.Error())
removalErr = err
}
log.Infof("remove data dir (symlinked) %v", target)
if err = os.RemoveAll(target); err != nil {
log.Errorf("failed removing %v: %v", target, err.Error())
removalErr = err
}
}
log.Infof("remove data dir %v", dir)
if err = os.RemoveAll(dir); err != nil {
log.Errorf("failed removing %v: %v", dir, err.Error())
removalErr = err
}
return
}
// ExecuteMysqlCommand executes some SQL commands using a mysql command line interface process
func (mysqld *Mysqld) ExecuteMysqlCommand(sql string) error {
dir, err := vtenv.VtMysqlRoot()
if err != nil {
return err
}
name := path.Join(dir, "bin/mysql")
arg := []string{
"-u", "vt_dba", "-S", mysqld.config.SocketFile,
"-e", sql}
env := []string{
"LD_LIBRARY_PATH=" + path.Join(dir, "lib/mysql"),
}
_, err = execCmd(name, arg, env, dir)
if err != nil {
return err
}
return nil
}
// GetAppConnection returns a connection from the app pool.
// Recycle needs to be called on the result.
func (mysqld *Mysqld) GetAppConnection() (dbconnpool.PoolConnection, error) {
return mysqld.appPool.Get(0)
}
// GetDbaConnection creates a new DBConnection.
func (mysqld *Mysqld) GetDbaConnection() (*dbconnpool.DBConnection, error) {
return dbconnpool.NewDBConnection(mysqld.dba, mysqld.dbaMysqlStats)
}
// Close will close this instance of Mysqld. It will wait for all dba
// queries to be finished.
func (mysqld *Mysqld) Close() {
mysqld.dbaPool.Close()
mysqld.appPool.Close()
}
// OnTerm registers a function to be called if mysqld terminates for any
// reason other than a call to Mysqld.Shutdown(). This only works if mysqld
// was actually started by calling Start() on this Mysqld instance.
func (mysqld *Mysqld) OnTerm(f func()) {
mysqld.mutex.Lock()
defer mysqld.mutex.Unlock()
mysqld.onTermFuncs = append(mysqld.onTermFuncs, f)
}