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tidb.go
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tidb.go
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// Copyright 2013 The ql Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSES/QL-LICENSE file.
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package session
import (
"net/url"
"strings"
"sync"
"time"
"github.com/juju/errors"
"github.com/opentracing/opentracing-go"
"github.com/pingcap/tidb/ast"
"github.com/pingcap/tidb/config"
"github.com/pingcap/tidb/domain"
"github.com/pingcap/tidb/executor"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/parser"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/terror"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util"
"github.com/pingcap/tidb/util/chunk"
log "github.com/sirupsen/logrus"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
type domainMap struct {
domains map[string]*domain.Domain
mu sync.Mutex
}
func (dm *domainMap) Get(store kv.Storage) (d *domain.Domain, err error) {
key := store.UUID()
dm.mu.Lock()
defer dm.mu.Unlock()
d = dm.domains[key]
if d != nil {
return
}
ddlLease := time.Duration(0)
statisticLease := time.Duration(0)
ddlLease = schemaLease
statisticLease = statsLease
err = util.RunWithRetry(util.DefaultMaxRetries, util.RetryInterval, func() (retry bool, err1 error) {
log.Infof("store %v new domain, ddl lease %v, stats lease %d", store.UUID(), ddlLease, statisticLease)
factory := createSessionFunc(store)
sysFactory := createSessionWithDomainFunc(store)
d = domain.NewDomain(store, ddlLease, statisticLease, factory)
err1 = d.Init(ddlLease, sysFactory)
if err1 != nil {
// If we don't clean it, there are some dirty data when retrying the function of Init.
d.Close()
log.Errorf("[ddl] init domain failed %v", errors.ErrorStack(errors.Trace(err1)))
}
return true, errors.Trace(err1)
})
if err != nil {
return nil, errors.Trace(err)
}
dm.domains[key] = d
return
}
func (dm *domainMap) Delete(store kv.Storage) {
dm.mu.Lock()
delete(dm.domains, store.UUID())
dm.mu.Unlock()
}
var (
domap = &domainMap{
domains: map[string]*domain.Domain{},
}
stores = make(map[string]kv.Driver)
// store.UUID()-> IfBootstrapped
storeBootstrapped = make(map[string]bool)
storeBootstrappedLock sync.Mutex
// schemaLease is the time for re-updating remote schema.
// In online DDL, we must wait 2 * SchemaLease time to guarantee
// all servers get the neweset schema.
// Default schema lease time is 1 second, you can change it with a proper time,
// but you must know that too little may cause badly performance degradation.
// For production, you should set a big schema lease, like 300s+.
schemaLease = 1 * time.Second
// statsLease is the time for reload stats table.
statsLease = 3 * time.Second
// The maximum number of retries to recover from retryable errors.
globalCommitRetryLimit uint = 10
)
// SetSchemaLease changes the default schema lease time for DDL.
// This function is very dangerous, don't use it if you really know what you do.
// SetSchemaLease only affects not local storage after bootstrapped.
func SetSchemaLease(lease time.Duration) {
schemaLease = lease
}
// SetStatsLease changes the default stats lease time for loading stats info.
func SetStatsLease(lease time.Duration) {
statsLease = lease
}
// SetCommitRetryLimit setups the maximum number of retries when trying to recover
// from retryable errors.
// Retryable errors are generally refer to temporary errors that are expected to be
// reinstated by retry, including network interruption, transaction conflicts, and
// so on.
func SetCommitRetryLimit(limit uint) {
globalCommitRetryLimit = limit
}
// Parse parses a query string to raw ast.StmtNode.
func Parse(ctx sessionctx.Context, src string) ([]ast.StmtNode, error) {
log.Debug("compiling", src)
charset, collation := ctx.GetSessionVars().GetCharsetInfo()
p := parser.New()
p.SetSQLMode(ctx.GetSessionVars().SQLMode)
stmts, err := p.Parse(src, charset, collation)
if err != nil {
log.Warnf("compiling %s, error: %v", src, err)
return nil, errors.Trace(err)
}
return stmts, nil
}
// Compile is safe for concurrent use by multiple goroutines.
func Compile(ctx context.Context, sctx sessionctx.Context, stmtNode ast.StmtNode) (ast.Statement, error) {
compiler := executor.Compiler{Ctx: sctx}
stmt, err := compiler.Compile(ctx, stmtNode)
return stmt, errors.Trace(err)
}
func finishStmt(ctx context.Context, sctx sessionctx.Context, se *session, sessVars *variable.SessionVars, meetsErr error) error {
if meetsErr != nil {
if !sessVars.InTxn() {
log.Info("RollbackTxn for ddl/autocommit error.")
terror.Log(se.RollbackTxn(ctx))
}
return meetsErr
}
if !sessVars.InTxn() {
return se.CommitTxn(ctx)
}
return checkStmtLimit(ctx, sctx, se, sessVars)
}
func checkStmtLimit(ctx context.Context, sctx sessionctx.Context, se *session, sessVars *variable.SessionVars) error {
// If the user insert, insert, insert ... but never commit, TiDB would OOM.
// So we limit the statement count in a transaction here.
var err error
history := GetHistory(sctx)
if history.Count() > int(config.GetGlobalConfig().Performance.StmtCountLimit) {
err1 := se.RollbackTxn(ctx)
terror.Log(errors.Trace(err1))
return errors.Errorf("statement count %d exceeds the transaction limitation, autocommit = %t",
history.Count(), sctx.GetSessionVars().IsAutocommit())
}
return err
}
// runStmt executes the ast.Statement and commit or rollback the current transaction.
func runStmt(ctx context.Context, sctx sessionctx.Context, s ast.Statement) (ast.RecordSet, error) {
span, ctx1 := opentracing.StartSpanFromContext(ctx, "runStmt")
span.LogKV("sql", s.OriginText())
defer span.Finish()
var err error
var rs ast.RecordSet
se := sctx.(*session)
rs, err = s.Exec(ctx)
span.SetTag("txn.id", se.sessionVars.TxnCtx.StartTS)
// All the history should be added here.
sessVars := se.GetSessionVars()
sessVars.TxnCtx.StatementCount++
if !s.IsReadOnly() {
if err == nil {
GetHistory(sctx).Add(0, s, se.sessionVars.StmtCtx)
}
if txn, err1 := sctx.Txn(false); err1 == nil {
if txn.Valid() {
if err != nil {
sctx.StmtRollback()
} else {
err = sctx.StmtCommit()
}
}
} else {
log.Error(err1)
}
}
err = finishStmt(ctx1, sctx, se, sessVars, err)
if se.txn.pending() {
// After run statement finish, txn state is still pending means the
// statement never need a Txn(), such as:
//
// set @@tidb_general_log = 1
// set @@autocommit = 0
// select 1
//
// Reset txn state to invalid to dispose the pending start ts.
se.txn.changeToInvalid()
}
return rs, errors.Trace(err)
}
// GetHistory get all stmtHistory in current txn. Exported only for test.
func GetHistory(ctx sessionctx.Context) *StmtHistory {
hist, ok := ctx.GetSessionVars().TxnCtx.Histroy.(*StmtHistory)
if ok {
return hist
}
hist = new(StmtHistory)
ctx.GetSessionVars().TxnCtx.Histroy = hist
return hist
}
// GetRows4Test gets all the rows from a RecordSet, only used for test.
func GetRows4Test(ctx context.Context, sctx sessionctx.Context, rs ast.RecordSet) ([]types.Row, error) {
if rs == nil {
return nil, nil
}
var rows []types.Row
for {
// Since we collect all the rows, we can not reuse the chunk.
chk := rs.NewChunk()
iter := chunk.NewIterator4Chunk(chk)
err := rs.Next(ctx, chk)
if err != nil {
return nil, errors.Trace(err)
}
if chk.NumRows() == 0 {
break
}
for row := iter.Begin(); row != iter.End(); row = iter.Next() {
rows = append(rows, row)
}
}
return rows, nil
}
// RegisterStore registers a kv storage with unique name and its associated Driver.
func RegisterStore(name string, driver kv.Driver) error {
name = strings.ToLower(name)
if _, ok := stores[name]; ok {
return errors.Errorf("%s is already registered", name)
}
stores[name] = driver
return nil
}
// NewStore creates a kv Storage with path.
//
// The path must be a URL format 'engine://path?params' like the one for
// session.Open() but with the dbname cut off.
// Examples:
// goleveldb://relative/path
// boltdb:///absolute/path
//
// The engine should be registered before creating storage.
func NewStore(path string) (kv.Storage, error) {
return newStoreWithRetry(path, util.DefaultMaxRetries)
}
func newStoreWithRetry(path string, maxRetries int) (kv.Storage, error) {
storeURL, err := url.Parse(path)
if err != nil {
return nil, errors.Trace(err)
}
name := strings.ToLower(storeURL.Scheme)
d, ok := stores[name]
if !ok {
return nil, errors.Errorf("invalid uri format, storage %s is not registered", name)
}
var s kv.Storage
err = util.RunWithRetry(maxRetries, util.RetryInterval, func() (bool, error) {
log.Infof("new store")
s, err = d.Open(path)
return kv.IsRetryableError(err), err
})
return s, errors.Trace(err)
}
// DialPumpClientWithRetry tries to dial to binlogSocket,
// if any error happens, it will try to re-dial,
// or return this error when timeout.
func DialPumpClientWithRetry(binlogSocket string, maxRetries int, dialerOpt grpc.DialOption) (*grpc.ClientConn, error) {
var clientCon *grpc.ClientConn
err := util.RunWithRetry(maxRetries, util.RetryInterval, func() (bool, error) {
log.Infof("setup binlog client")
var err error
tlsConfig, err := config.GetGlobalConfig().Security.ToTLSConfig()
if err != nil {
log.Infof("error happen when setting binlog client: %s", errors.ErrorStack(err))
}
if tlsConfig != nil {
clientCon, err = grpc.Dial(binlogSocket, grpc.WithTransportCredentials(credentials.NewTLS(tlsConfig)), dialerOpt)
} else {
clientCon, err = grpc.Dial(binlogSocket, grpc.WithInsecure(), dialerOpt)
}
if err != nil {
log.Infof("error happen when setting binlog client: %s", errors.ErrorStack(err))
}
return true, errors.Trace(err)
})
return clientCon, errors.Trace(err)
}
var queryStmtTable = []string{"explain", "select", "show", "execute", "describe", "desc", "admin"}
func trimSQL(sql string) string {
// Trim space.
sql = strings.TrimSpace(sql)
// Trim leading /*comment*/
// There may be multiple comments
for strings.HasPrefix(sql, "/*") {
i := strings.Index(sql, "*/")
if i != -1 && i < len(sql)+1 {
sql = sql[i+2:]
sql = strings.TrimSpace(sql)
continue
}
break
}
// Trim leading '('. For `(select 1);` is also a query.
return strings.TrimLeft(sql, "( ")
}
// IsQuery checks if a sql statement is a query statement.
func IsQuery(sql string) bool {
sqlText := strings.ToLower(trimSQL(sql))
for _, key := range queryStmtTable {
if strings.HasPrefix(sqlText, key) {
return true
}
}
return false
}
func init() {
}