tidb server 源码
tidb server 代码
文件路径：/server/server.go
// Copyright 2015 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// The MIT License (MIT)
//
// Copyright (c) 2014 wandoulabs
// Copyright (c) 2014 siddontang
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
package server
import (
"context"
"crypto/tls"
"fmt"
"io"
"math/rand"
"net"
"net/http" //nolint:goimports
// For pprof
_ "net/http/pprof" // #nosec G108
"os"
"os/user"
"sync"
"sync/atomic"
"time"
"unsafe"
"github.com/blacktear23/go-proxyprotocol"
"github.com/pingcap/errors"
"github.com/pingcap/tidb/config"
"github.com/pingcap/tidb/domain"
"github.com/pingcap/tidb/errno"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/metrics"
"github.com/pingcap/tidb/parser/mysql"
"github.com/pingcap/tidb/parser/terror"
"github.com/pingcap/tidb/plugin"
"github.com/pingcap/tidb/session"
"github.com/pingcap/tidb/session/txninfo"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/util"
"github.com/pingcap/tidb/util/dbterror"
"github.com/pingcap/tidb/util/fastrand"
"github.com/pingcap/tidb/util/logutil"
"github.com/pingcap/tidb/util/sys/linux"
"github.com/pingcap/tidb/util/timeutil"
"go.uber.org/zap"
"google.golang.org/grpc"
)
var (
serverPID int
osUser string
osVersion string
// RunInGoTest represents whether we are run code in test.
RunInGoTest bool
)
func init() {
serverPID = os.Getpid()
currentUser, err := user.Current()
if err != nil {
osUser = ""
} else {
osUser = currentUser.Name
}
osVersion, err = linux.OSVersion()
if err != nil {
osVersion = ""
}
}
var (
errUnknownFieldType = dbterror.ClassServer.NewStd(errno.ErrUnknownFieldType)
errInvalidSequence = dbterror.ClassServer.NewStd(errno.ErrInvalidSequence)
errInvalidType = dbterror.ClassServer.NewStd(errno.ErrInvalidType)
errNotAllowedCommand = dbterror.ClassServer.NewStd(errno.ErrNotAllowedCommand)
errAccessDenied = dbterror.ClassServer.NewStd(errno.ErrAccessDenied)
errAccessDeniedNoPassword = dbterror.ClassServer.NewStd(errno.ErrAccessDeniedNoPassword)
errConCount = dbterror.ClassServer.NewStd(errno.ErrConCount)
errSecureTransportRequired = dbterror.ClassServer.NewStd(errno.ErrSecureTransportRequired)
errMultiStatementDisabled = dbterror.ClassServer.NewStd(errno.ErrMultiStatementDisabled)
errNewAbortingConnection = dbterror.ClassServer.NewStd(errno.ErrNewAbortingConnection)
errNotSupportedAuthMode = dbterror.ClassServer.NewStd(errno.ErrNotSupportedAuthMode)
errNetPacketTooLarge = dbterror.ClassServer.NewStd(errno.ErrNetPacketTooLarge)
)
// DefaultCapability is the capability of the server when it is created using the default configuration.
// When server is configured with SSL, the server will have extra capabilities compared to DefaultCapability.
const defaultCapability = mysql.ClientLongPassword | mysql.ClientLongFlag |
mysql.ClientConnectWithDB | mysql.ClientProtocol41 |
mysql.ClientTransactions | mysql.ClientSecureConnection | mysql.ClientFoundRows |
mysql.ClientMultiStatements | mysql.ClientMultiResults | mysql.ClientLocalFiles |
mysql.ClientConnectAtts | mysql.ClientPluginAuth | mysql.ClientInteractive | mysql.ClientDeprecateEOF
// Server is the MySQL protocol server
type Server struct {
cfg *config.Config
tlsConfig unsafe.Pointer // *tls.Config
driver IDriver
listener net.Listener
socket net.Listener
rwlock sync.RWMutex
concurrentLimiter *TokenLimiter
clients map[uint64]*clientConn
capability uint32
dom *domain.Domain
globalConnID util.GlobalConnID
statusAddr string
statusListener net.Listener
statusServer *http.Server
grpcServer *grpc.Server
inShutdownMode bool
sessionMapMutex sync.Mutex
internalSessions map[interface{}]struct{}
}
// ConnectionCount gets current connection count.
func (s *Server) ConnectionCount() int {
s.rwlock.RLock()
cnt := len(s.clients)
s.rwlock.RUnlock()
return cnt
}
func (s *Server) getToken() *Token {
start := time.Now()
tok := s.concurrentLimiter.Get()
metrics.TokenGauge.Inc()
// Note that data smaller than one microsecond is ignored, because that case can be viewed as non-block.
metrics.GetTokenDurationHistogram.Observe(float64(time.Since(start).Nanoseconds() / 1e3))
return tok
}
func (s *Server) releaseToken(token *Token) {
s.concurrentLimiter.Put(token)
metrics.TokenGauge.Dec()
}
// SetDomain use to set the server domain.
func (s *Server) SetDomain(dom *domain.Domain) {
s.dom = dom
}
// InitGlobalConnID initialize global connection id.
func (s *Server) InitGlobalConnID(serverIDGetter func() uint64) {
s.globalConnID = util.NewGlobalConnIDWithGetter(serverIDGetter, true)
}
// newConn creates a new *clientConn from a net.Conn.
// It allocates a connection ID and random salt data for authentication.
func (s *Server) newConn(conn net.Conn) *clientConn {
cc := newClientConn(s)
if tcpConn, ok := conn.(*net.TCPConn); ok {
if err := tcpConn.SetKeepAlive(s.cfg.Performance.TCPKeepAlive); err != nil {
logutil.BgLogger().Error("failed to set tcp keep alive option", zap.Error(err))
}
if err := tcpConn.SetNoDelay(s.cfg.Performance.TCPNoDelay); err != nil {
logutil.BgLogger().Error("failed to set tcp no delay option", zap.Error(err))
}
}
cc.setConn(conn)
cc.salt = fastrand.Buf(20)
return cc
}
// NewServer creates a new Server.
func NewServer(cfg *config.Config, driver IDriver) (*Server, error) {
s := &Server{
cfg: cfg,
driver: driver,
concurrentLimiter: NewTokenLimiter(cfg.TokenLimit),
clients: make(map[uint64]*clientConn),
globalConnID: util.NewGlobalConnID(0, true),
internalSessions: make(map[interface{}]struct{}, 100),
}
s.capability = defaultCapability
setTxnScope()
setSystemTimeZoneVariable()
tlsConfig, autoReload, err := util.LoadTLSCertificates(
s.cfg.Security.SSLCA, s.cfg.Security.SSLKey, s.cfg.Security.SSLCert,
s.cfg.Security.AutoTLS, s.cfg.Security.RSAKeySize)
// LoadTLSCertificates will auto generate certificates if autoTLS is enabled.
// It only returns an error if certificates are specified and invalid.
// In which case, we should halt server startup as a misconfiguration could
// lead to a connection downgrade.
if err != nil {
return nil, errors.Trace(err)
}
// Automatically reload auto-generated certificates.
// The certificates are re-created every 30 days and are valid for 90 days.
if autoReload {
go func() {
for range time.Tick(time.Hour * 24 * 30) { // 30 days
logutil.BgLogger().Info("Rotating automatically created TLS Certificates")
tlsConfig, _, err = util.LoadTLSCertificates(
s.cfg.Security.SSLCA, s.cfg.Security.SSLKey, s.cfg.Security.SSLCert,
s.cfg.Security.AutoTLS, s.cfg.Security.RSAKeySize)
if err != nil {
logutil.BgLogger().Warn("TLS Certificate rotation failed", zap.Error(err))
}
atomic.StorePointer(&s.tlsConfig, unsafe.Pointer(tlsConfig))
}
}()
}
if tlsConfig != nil {
setSSLVariable(s.cfg.Security.SSLCA, s.cfg.Security.SSLKey, s.cfg.Security.SSLCert)
atomic.StorePointer(&s.tlsConfig, unsafe.Pointer(tlsConfig))
logutil.BgLogger().Info("mysql protocol server secure connection is enabled",
zap.Bool("client verification enabled", len(variable.GetSysVar("ssl_ca").Value) > 0))
}
if s.tlsConfig != nil {
s.capability |= mysql.ClientSSL
}
if s.cfg.Host != "" && (s.cfg.Port != 0 || RunInGoTest) {
addr := fmt.Sprintf("%s:%d", s.cfg.Host, s.cfg.Port)
tcpProto := "tcp"
if s.cfg.EnableTCP4Only {
tcpProto = "tcp4"
}
if s.listener, err = net.Listen(tcpProto, addr); err != nil {
return nil, errors.Trace(err)
}
logutil.BgLogger().Info("server is running MySQL protocol", zap.String("addr", addr))
if RunInGoTest && s.cfg.Port == 0 {
s.cfg.Port = uint(s.listener.Addr().(*net.TCPAddr).Port)
}
}
if s.cfg.Socket != "" {
if err := cleanupStaleSocket(s.cfg.Socket); err != nil {
return nil, errors.Trace(err)
}
if s.socket, err = net.Listen("unix", s.cfg.Socket); err != nil {
return nil, errors.Trace(err)
}
logutil.BgLogger().Info("server is running MySQL protocol", zap.String("socket", s.cfg.Socket))
}
if s.socket == nil && s.listener == nil {
err = errors.New("Server not configured to listen on either -socket or -host and -port")
return nil, errors.Trace(err)
}
if s.cfg.ProxyProtocol.Networks != "" {
proxyTarget := s.listener
if proxyTarget == nil {
proxyTarget = s.socket
}
ppListener, err := proxyprotocol.NewLazyListener(proxyTarget, s.cfg.ProxyProtocol.Networks,
int(s.cfg.ProxyProtocol.HeaderTimeout))
if err != nil {
logutil.BgLogger().Error("ProxyProtocol networks parameter invalid")
return nil, errors.Trace(err)
}
if s.listener != nil {
s.listener = ppListener
logutil.BgLogger().Info("server is running MySQL protocol (through PROXY protocol)", zap.String("host", s.cfg.Host))
} else {
s.socket = ppListener
logutil.BgLogger().Info("server is running MySQL protocol (through PROXY protocol)", zap.String("socket", s.cfg.Socket))
}
}
if s.cfg.Status.ReportStatus {
if err = s.listenStatusHTTPServer(); err != nil {
return nil, errors.Trace(err)
}
}
// Init rand seed for randomBuf()
rand.Seed(time.Now().UTC().UnixNano())
variable.RegisterStatistics(s)
return s, nil
}
func cleanupStaleSocket(socket string) error {
sockStat, err := os.Stat(socket)
if err != nil {
return nil
}
if sockStat.Mode().Type() != os.ModeSocket {
return fmt.Errorf(
"the specified socket file %s is a %s instead of a socket file",
socket, sockStat.Mode().String())
}
if _, err = net.Dial("unix", socket); err == nil {
return fmt.Errorf("unix socket %s exists and is functional, not removing it", socket)
}
if err2 := os.Remove(socket); err2 != nil {
return fmt.Errorf("failed to cleanup stale Unix socket file %s: %w", socket, err)
}
return nil
}
func setSSLVariable(ca, key, cert string) {
variable.SetSysVar("have_openssl", "YES")
variable.SetSysVar("have_ssl", "YES")
variable.SetSysVar("ssl_cert", cert)
variable.SetSysVar("ssl_key", key)
variable.SetSysVar("ssl_ca", ca)
}
func setTxnScope() {
variable.SetSysVar(variable.TiDBTxnScope, func() string {
if !variable.EnableLocalTxn.Load() {
return kv.GlobalTxnScope
}
if txnScope := config.GetTxnScopeFromConfig(); txnScope == kv.GlobalTxnScope {
return kv.GlobalTxnScope
}
return kv.LocalTxnScope
}())
}
// Export config-related metrics
func (s *Server) reportConfig() {
metrics.ConfigStatus.WithLabelValues("token-limit").Set(float64(s.cfg.TokenLimit))
metrics.ConfigStatus.WithLabelValues("max_connections").Set(float64(s.cfg.Instance.MaxConnections))
}
// Run runs the server.
func (s *Server) Run() error {
metrics.ServerEventCounter.WithLabelValues(metrics.EventStart).Inc()
s.reportConfig()
// Start HTTP API to report tidb info such as TPS.
if s.cfg.Status.ReportStatus {
s.startStatusHTTP()
}
// If error should be reported and exit the server it can be sent on this
// channel. Otherwise, end with sending a nil error to signal "done"
errChan := make(chan error)
go s.startNetworkListener(s.listener, false, errChan)
go s.startNetworkListener(s.socket, true, errChan)
err := <-errChan
if err != nil {
return err
}
return <-errChan
}
func (s *Server) startNetworkListener(listener net.Listener, isUnixSocket bool, errChan chan error) {
if listener == nil {
errChan <- nil
return
}
for {
conn, err := listener.Accept()
if err != nil {
if opErr, ok := err.(*net.OpError); ok {
if opErr.Err.Error() == "use of closed network connection" {
if s.inShutdownMode {
errChan <- nil
} else {
errChan <- err
}
return
}
}
// If we got PROXY protocol error, we should continue to accept.
if proxyprotocol.IsProxyProtocolError(err) {
logutil.BgLogger().Error("PROXY protocol failed", zap.Error(err))
continue
}
logutil.BgLogger().Error("accept failed", zap.Error(err))
errChan <- err
return
}
clientConn := s.newConn(conn)
if isUnixSocket {
uc, ok := conn.(*net.UnixConn)
if !ok {
logutil.BgLogger().Error("Expected UNIX socket, but got something else")
return
}
clientConn.isUnixSocket = true
clientConn.peerHost = "localhost"
clientConn.socketCredUID, err = linux.GetSockUID(*uc)
if err != nil {
logutil.BgLogger().Error("Failed to get UNIX socket peer credentials", zap.Error(err))
return
}
}
err = plugin.ForeachPlugin(plugin.Audit, func(p *plugin.Plugin) error {
authPlugin := plugin.DeclareAuditManifest(p.Manifest)
if authPlugin.OnConnectionEvent == nil {
return nil
}
host, _, err := clientConn.PeerHost("")
if err != nil {
logutil.BgLogger().Error("get peer host failed", zap.Error(err))
terror.Log(clientConn.Close())
return errors.Trace(err)
}
if err = authPlugin.OnConnectionEvent(context.Background(), plugin.PreAuth,
&variable.ConnectionInfo{Host: host}); err != nil {
logutil.BgLogger().Info("do connection event failed", zap.Error(err))
terror.Log(clientConn.Close())
return errors.Trace(err)
}
return nil
})
if err != nil {
continue
}
if s.dom != nil && s.dom.IsLostConnectionToPD() {
logutil.BgLogger().Warn("reject connection due to lost connection to PD")
terror.Log(clientConn.Close())
continue
}
go s.onConn(clientConn)
}
}
func (s *Server) startShutdown() {
s.rwlock.RLock()
logutil.BgLogger().Info("setting tidb-server to report unhealthy (shutting-down)")
s.inShutdownMode = true
s.rwlock.RUnlock()
// give the load balancer a chance to receive a few unhealthy health reports
// before acquiring the s.rwlock and blocking connections.
waitTime := time.Duration(s.cfg.GracefulWaitBeforeShutdown) * time.Second
if waitTime > 0 {
logutil.BgLogger().Info("waiting for stray connections before starting shutdown process", zap.Duration("waitTime", waitTime))
time.Sleep(waitTime)
}
}
// Close closes the server.
func (s *Server) Close() {
s.startShutdown()
s.rwlock.Lock() // prevent new connections
defer s.rwlock.Unlock()
if s.listener != nil {
err := s.listener.Close()
terror.Log(errors.Trace(err))
s.listener = nil
}
if s.socket != nil {
err := s.socket.Close()
terror.Log(errors.Trace(err))
s.socket = nil
}
if s.statusServer != nil {
err := s.statusServer.Close()
terror.Log(errors.Trace(err))
s.statusServer = nil
}
if s.grpcServer != nil {
s.grpcServer.Stop()
s.grpcServer = nil
}
metrics.ServerEventCounter.WithLabelValues(metrics.EventClose).Inc()
}
// onConn runs in its own goroutine, handles queries from this connection.
func (s *Server) onConn(conn *clientConn) {
ctx := logutil.WithConnID(context.Background(), conn.connectionID)
if err := conn.handshake(ctx); err != nil {
if plugin.IsEnable(plugin.Audit) && conn.getCtx() != nil {
conn.getCtx().GetSessionVars().ConnectionInfo = conn.connectInfo()
err = plugin.ForeachPlugin(plugin.Audit, func(p *plugin.Plugin) error {
authPlugin := plugin.DeclareAuditManifest(p.Manifest)
if authPlugin.OnConnectionEvent != nil {
pluginCtx := context.WithValue(context.Background(), plugin.RejectReasonCtxValue{}, err.Error())
return authPlugin.OnConnectionEvent(pluginCtx, plugin.Reject, conn.ctx.GetSessionVars().ConnectionInfo)
}
return nil
})
terror.Log(err)
}
switch errors.Cause(err) {
case io.EOF:
// `EOF` means the connection is closed normally, we do not treat it as a noticeable error and log it in 'DEBUG' level.
logutil.BgLogger().With(zap.Uint64("conn", conn.connectionID)).
Debug("EOF", zap.String("remote addr", conn.bufReadConn.RemoteAddr().String()))
case errConCount:
if err := conn.writeError(ctx, err); err != nil {
logutil.BgLogger().With(zap.Uint64("conn", conn.connectionID)).
Warn("error in writing errConCount", zap.Error(err),
zap.String("remote addr", conn.bufReadConn.RemoteAddr().String()))
}
default:
metrics.HandShakeErrorCounter.Inc()
logutil.BgLogger().With(zap.Uint64("conn", conn.connectionID)).
Warn("Server.onConn handshake", zap.Error(err),
zap.String("remote addr", conn.bufReadConn.RemoteAddr().String()))
}
terror.Log(conn.Close())
return
}
logutil.Logger(ctx).Debug("new connection", zap.String("remoteAddr", conn.bufReadConn.RemoteAddr().String()))
defer func() {
terror.Log(conn.Close())
logutil.Logger(ctx).Debug("connection closed")
}()
s.rwlock.Lock()
s.clients[conn.connectionID] = conn
connections := len(s.clients)
s.rwlock.Unlock()
metrics.ConnGauge.Set(float64(connections))
sessionVars := conn.ctx.GetSessionVars()
sessionVars.ConnectionInfo = conn.connectInfo()
err := plugin.ForeachPlugin(plugin.Audit, func(p *plugin.Plugin) error {
authPlugin := plugin.DeclareAuditManifest(p.Manifest)
if authPlugin.OnConnectionEvent != nil {
return authPlugin.OnConnectionEvent(context.Background(), plugin.Connected, sessionVars.ConnectionInfo)
}
return nil
})
if err != nil {
return
}
connectedTime := time.Now()
conn.Run(ctx)
err = plugin.ForeachPlugin(plugin.Audit, func(p *plugin.Plugin) error {
authPlugin := plugin.DeclareAuditManifest(p.Manifest)
if authPlugin.OnConnectionEvent != nil {
sessionVars.ConnectionInfo.Duration = float64(time.Since(connectedTime)) / float64(time.Millisecond)
err := authPlugin.OnConnectionEvent(context.Background(), plugin.Disconnect, sessionVars.ConnectionInfo)
if err != nil {
logutil.BgLogger().Warn("do connection event failed", zap.String("plugin", authPlugin.Name), zap.Error(err))
}
}
return nil
})
if err != nil {
return
}
}
func (cc *clientConn) connectInfo() *variable.ConnectionInfo {
connType := variable.ConnTypeSocket
if cc.isUnixSocket {
connType = variable.ConnTypeUnixSocket
} else if cc.tlsConn != nil {
connType = variable.ConnTypeTLS
}
connInfo := &variable.ConnectionInfo{
ConnectionID: cc.connectionID,
ConnectionType: connType,
Host: cc.peerHost,
ClientIP: cc.peerHost,
ClientPort: cc.peerPort,
ServerID: 1,
ServerPort: int(cc.server.cfg.Port),
User: cc.user,
ServerOSLoginUser: osUser,
OSVersion: osVersion,
ServerVersion: mysql.TiDBReleaseVersion,
SSLVersion: "v1.2.0", // for current go version
PID: serverPID,
DB: cc.dbname,
}
return connInfo
}
func (s *Server) checkConnectionCount() error {
// When the value of Instance.MaxConnections is 0, the number of connections is unlimited.
if int(s.cfg.Instance.MaxConnections) == 0 {
return nil
}
s.rwlock.RLock()
conns := len(s.clients)
s.rwlock.RUnlock()
if conns >= int(s.cfg.Instance.MaxConnections) {
logutil.BgLogger().Error("too many connections",
zap.Uint32("max connections", s.cfg.Instance.MaxConnections), zap.Error(errConCount))
return errConCount
}
return nil
}
// ShowProcessList implements the SessionManager interface.
func (s *Server) ShowProcessList() map[uint64]*util.ProcessInfo {
rs := make(map[uint64]*util.ProcessInfo)
for connID, pi := range s.getUserProcessList() {
rs[connID] = pi
}
if s.dom != nil {
for connID, pi := range s.dom.SysProcTracker().GetSysProcessList() {
rs[connID] = pi
}
}
return rs
}
func (s *Server) getUserProcessList() map[uint64]*util.ProcessInfo {
s.rwlock.RLock()
defer s.rwlock.RUnlock()
rs := make(map[uint64]*util.ProcessInfo)
for _, client := range s.clients {
if pi := client.ctx.ShowProcess(); pi != nil {
rs[pi.ID] = pi
}
}
return rs
}
// ShowTxnList shows all txn info for displaying in `TIDB_TRX`
func (s *Server) ShowTxnList() []*txninfo.TxnInfo {
s.rwlock.RLock()
defer s.rwlock.RUnlock()
rs := make([]*txninfo.TxnInfo, 0, len(s.clients))
for _, client := range s.clients {
if client.ctx.Session != nil {
info := client.ctx.Session.TxnInfo()
if info != nil {
rs = append(rs, info)
}
}
}
return rs
}
// GetProcessInfo implements the SessionManager interface.
func (s *Server) GetProcessInfo(id uint64) (*util.ProcessInfo, bool) {
s.rwlock.RLock()
conn, ok := s.clients[id]
s.rwlock.RUnlock()
if !ok {
return &util.ProcessInfo{}, false
}
return conn.ctx.ShowProcess(), ok
}
// Kill implements the SessionManager interface.
func (s *Server) Kill(connectionID uint64, query bool) {
logutil.BgLogger().Info("kill", zap.Uint64("connID", connectionID), zap.Bool("query", query))
metrics.ServerEventCounter.WithLabelValues(metrics.EventKill).Inc()
s.rwlock.RLock()
defer s.rwlock.RUnlock()
conn, ok := s.clients[connectionID]
if !ok && s.dom != nil {
s.dom.SysProcTracker().KillSysProcess(connectionID)
return
}
if !query {
// Mark the client connection status as WaitShutdown, when clientConn.Run detect
// this, it will end the dispatch loop and exit.
atomic.StoreInt32(&conn.status, connStatusWaitShutdown)
}
killConn(conn)
}
// UpdateTLSConfig implements the SessionManager interface.
func (s *Server) UpdateTLSConfig(cfg *tls.Config) {
atomic.StorePointer(&s.tlsConfig, unsafe.Pointer(cfg))
}
func (s *Server) getTLSConfig() *tls.Config {
return (*tls.Config)(atomic.LoadPointer(&s.tlsConfig))
}
func killConn(conn *clientConn) {
sessVars := conn.ctx.GetSessionVars()
atomic.StoreUint32(&sessVars.Killed, 1)
conn.mu.RLock()
cancelFunc := conn.mu.cancelFunc
conn.mu.RUnlock()
if cancelFunc != nil {
cancelFunc()
}
if conn.bufReadConn != nil {
if err := conn.bufReadConn.SetReadDeadline(time.Now()); err != nil {
logutil.BgLogger().Warn("error setting read deadline for kill.", zap.Error(err))
}
}
}
// KillAllConnections kills all connections when server is not gracefully shutdown.
func (s *Server) KillAllConnections() {
logutil.BgLogger().Info("[server] kill all connections.")
s.rwlock.RLock()
defer s.rwlock.RUnlock()
for _, conn := range s.clients {
atomic.StoreInt32(&conn.status, connStatusShutdown)
if err := conn.closeWithoutLock(); err != nil {
terror.Log(err)
}
killConn(conn)
}
if s.dom != nil {
sysProcTracker := s.dom.SysProcTracker()
for connID := range sysProcTracker.GetSysProcessList() {
sysProcTracker.KillSysProcess(connID)
}
}
}
var gracefulCloseConnectionsTimeout = 15 * time.Second
// TryGracefulDown will try to gracefully close all connection first with timeout. if timeout, will close all connection directly.
func (s *Server) TryGracefulDown() {
ctx, cancel := context.WithTimeout(context.Background(), gracefulCloseConnectionsTimeout)
defer cancel()
done := make(chan struct{})
go func() {
s.GracefulDown(ctx, done)
}()
select {
case <-ctx.Done():
s.KillAllConnections()
case <-done:
return
}
}
// GracefulDown waits all clients to close.
func (s *Server) GracefulDown(ctx context.Context, done chan struct{}) {
logutil.Logger(ctx).Info("[server] graceful shutdown.")
metrics.ServerEventCounter.WithLabelValues(metrics.EventGracefulDown).Inc()
count := s.ConnectionCount()
for i := 0; count > 0; i++ {
s.kickIdleConnection()
count = s.ConnectionCount()
if count == 0 {
break
}
// Print information for every 30s.
if i%30 == 0 {
logutil.Logger(ctx).Info("graceful shutdown...", zap.Int("conn count", count))
}
ticker := time.After(time.Second)
select {
case <-ctx.Done():
return
case <-ticker:
}
}
close(done)
}
func (s *Server) kickIdleConnection() {
var conns []*clientConn
s.rwlock.RLock()
for _, cc := range s.clients {
if cc.ShutdownOrNotify() {
// Shutdowned conn will be closed by us, and notified conn will exist themselves.
conns = append(conns, cc)
}
}
s.rwlock.RUnlock()
for _, cc := range conns {
err := cc.Close()
if err != nil {
logutil.BgLogger().Error("close connection", zap.Error(err))
}
}
}
// ServerID implements SessionManager interface.
func (s *Server) ServerID() uint64 {
return s.dom.ServerID()
}
// StoreInternalSession implements SessionManager interface.
// @param addr The address of a session.session struct variable
func (s *Server) StoreInternalSession(se interface{}) {
s.sessionMapMutex.Lock()
s.internalSessions[se] = struct{}{}
s.sessionMapMutex.Unlock()
}
// DeleteInternalSession implements SessionManager interface.
// @param addr The address of a session.session struct variable
func (s *Server) DeleteInternalSession(se interface{}) {
s.sessionMapMutex.Lock()
delete(s.internalSessions, se)
s.sessionMapMutex.Unlock()
}
// GetInternalSessionStartTSList implements SessionManager interface.
func (s *Server) GetInternalSessionStartTSList() []uint64 {
s.sessionMapMutex.Lock()
defer s.sessionMapMutex.Unlock()
tsList := make([]uint64, 0, len(s.internalSessions))
analyzeProcID := util.GetAutoAnalyzeProcID(s.ServerID)
for se := range s.internalSessions {
if ts, processInfoID := session.GetStartTSFromSession(se); ts != 0 {
if processInfoID == analyzeProcID {
continue
}
tsList = append(tsList, ts)
}
}
return tsList
}
// InternalSessionExists is used for test
func (s *Server) InternalSessionExists(se interface{}) bool {
s.sessionMapMutex.Lock()
_, ok := s.internalSessions[se]
s.sessionMapMutex.Unlock()
return ok
}
// setSysTimeZoneOnce is used for parallel run tests. When several servers are running,
// only the first will actually do setSystemTimeZoneVariable, thus we can avoid data race.
var setSysTimeZoneOnce = &sync.Once{}
func setSystemTimeZoneVariable() {
setSysTimeZoneOnce.Do(func() {
tz, err := timeutil.GetSystemTZ()
if err != nil {
logutil.BgLogger().Error(
"Error getting SystemTZ, use default value instead",
zap.Error(err),
zap.String("default system_time_zone", variable.GetSysVar("system_time_zone").Value))
return
}
variable.SetSysVar("system_time_zone", tz)
})
}
// CheckOldRunningTxn implements SessionManager interface.
func (s *Server) CheckOldRunningTxn(job2ver map[int64]int64, job2ids map[int64]string) {
s.rwlock.RLock()
defer s.rwlock.RUnlock()
for _, client := range s.clients {
if client.ctx.Session != nil {
session.RemoveLockDDLJobs(client.ctx.Session, job2ver, job2ids)
}
}
}
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