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basedb.go
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basedb.go
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// Copyright 2019 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 conn
import (
"context"
"database/sql"
"fmt"
"net/url"
"strconv"
"sync"
"sync/atomic"
"github.com/go-sql-driver/mysql"
"github.com/pingcap/errors"
"github.com/pingcap/failpoint"
"github.com/pingcap/tidb/util"
"go.uber.org/zap"
"github.com/pingcap/tiflow/dm/dm/config"
tcontext "github.com/pingcap/tiflow/dm/pkg/context"
"github.com/pingcap/tiflow/dm/pkg/log"
"github.com/pingcap/tiflow/dm/pkg/retry"
"github.com/pingcap/tiflow/dm/pkg/terror"
"github.com/pingcap/tiflow/dm/pkg/utils"
)
var customID int64
var netTimeout = utils.DefaultDBTimeout
// DBProvider providers BaseDB instance.
type DBProvider interface {
Apply(config *config.DBConfig) (*BaseDB, error)
}
// DefaultDBProviderImpl is default DBProvider implement.
type DefaultDBProviderImpl struct{}
// DefaultDBProvider is global instance of DBProvider.
var DefaultDBProvider DBProvider
func init() {
DefaultDBProvider = &DefaultDBProviderImpl{}
}
// Apply will build BaseDB with DBConfig.
func (d *DefaultDBProviderImpl) Apply(config *config.DBConfig) (*BaseDB, error) {
// maxAllowedPacket=0 can be used to automatically fetch the max_allowed_packet variable from server on every connection.
// https://github.com/go-sql-driver/mysql#maxallowedpacket
dsn := fmt.Sprintf("%s:%s@tcp(%s:%d)/?charset=utf8mb4&interpolateParams=true&maxAllowedPacket=0",
config.User, config.Password, config.Host, config.Port)
doFuncInClose := func() {}
if config.Security != nil {
if loadErr := config.Security.LoadTLSContent(); loadErr != nil {
return nil, terror.ErrCtlLoadTLSCfg.Delegate(loadErr)
}
tlsConfig, err := util.ToTLSConfigWithVerifyByRawbytes(config.Security.SSLCABytes,
config.Security.SSLCertBytes, config.Security.SSLKEYBytes, config.Security.CertAllowedCN)
if err != nil {
return nil, terror.ErrConnInvalidTLSConfig.Delegate(err)
}
// NOTE for local test(use a self-signed or invalid certificate), we don't need to check CA file.
// see more here https://github.com/go-sql-driver/mysql#tls
if config.Host == "127.0.0.1" || len(config.Security.SSLCertBytes) == 0 || len(config.Security.SSLKEYBytes) == 0 {
tlsConfig.InsecureSkipVerify = true
}
name := "dm" + strconv.FormatInt(atomic.AddInt64(&customID, 1), 10)
err = mysql.RegisterTLSConfig(name, tlsConfig)
if err != nil {
return nil, terror.ErrConnRegistryTLSConfig.Delegate(err)
}
dsn += "&tls=" + name
doFuncInClose = func() {
mysql.DeregisterTLSConfig(name)
}
}
var maxIdleConns int
rawCfg := config.RawDBCfg
if rawCfg != nil {
if rawCfg.ReadTimeout != "" {
dsn += fmt.Sprintf("&readTimeout=%s", rawCfg.ReadTimeout)
}
if rawCfg.WriteTimeout != "" {
dsn += fmt.Sprintf("&writeTimeout=%s", rawCfg.WriteTimeout)
}
maxIdleConns = rawCfg.MaxIdleConns
}
for key, val := range config.Session {
// for num such as 1/"1", format as key='1'
// for string, format as key='string'
// both are valid for mysql and tidb
dsn += fmt.Sprintf("&%s='%s'", key, url.QueryEscape(val))
}
db, err := sql.Open("mysql", dsn)
if err != nil {
return nil, terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
ctx, cancel := context.WithTimeout(context.Background(), netTimeout)
defer cancel()
err = db.PingContext(ctx)
failpoint.Inject("failDBPing", func(_ failpoint.Value) {
err = errors.New("injected error")
})
if err != nil {
db.Close()
doFuncInClose()
return nil, terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
db.SetMaxIdleConns(maxIdleConns)
return NewBaseDB(db, doFuncInClose), nil
}
// BaseDB wraps *sql.DB, control the BaseConn.
type BaseDB struct {
DB *sql.DB
mu sync.Mutex // protects following fields
// hold all db connections generated from this BaseDB
conns map[*BaseConn]struct{}
Retry retry.Strategy
// this function will do when close the BaseDB
doFuncInClose []func()
}
// NewBaseDB returns *BaseDB object.
func NewBaseDB(db *sql.DB, doFuncInClose ...func()) *BaseDB {
conns := make(map[*BaseConn]struct{})
return &BaseDB{DB: db, conns: conns, Retry: &retry.FiniteRetryStrategy{}, doFuncInClose: doFuncInClose}
}
// GetBaseConn retrieves *BaseConn which has own retryStrategy.
func (d *BaseDB) GetBaseConn(ctx context.Context) (*BaseConn, error) {
ctx, cancel := context.WithTimeout(ctx, netTimeout)
defer cancel()
conn, err := d.DB.Conn(ctx)
if err != nil {
return nil, terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
err = conn.PingContext(ctx)
if err != nil {
return nil, terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
baseConn := NewBaseConn(conn, d.Retry)
d.mu.Lock()
defer d.mu.Unlock()
d.conns[baseConn] = struct{}{}
return baseConn, nil
}
// TODO: retry can be done inside the BaseDB.
func (d *BaseDB) ExecContext(tctx *tcontext.Context, query string, args ...interface{}) (sql.Result, error) {
if tctx.L().Core().Enabled(zap.DebugLevel) {
tctx.L().Debug("exec context",
zap.String("query", utils.TruncateString(query, -1)),
zap.String("argument", utils.TruncateInterface(args, -1)))
}
return d.DB.ExecContext(tctx.Ctx, query, args...)
}
// TODO: retry can be done inside the BaseDB.
func (d *BaseDB) QueryContext(tctx *tcontext.Context, query string, args ...interface{}) (*sql.Rows, error) {
if tctx.L().Core().Enabled(zap.DebugLevel) {
tctx.L().Debug("query context",
zap.String("query", utils.TruncateString(query, -1)),
zap.String("argument", utils.TruncateInterface(args, -1)))
}
return d.DB.QueryContext(tctx.Ctx, query, args...)
}
func (d *BaseDB) DoTxWithRetry(tctx *tcontext.Context, queries []string, args [][]interface{}, retryer retry.Retryer) error {
workFunc := func(tctx *tcontext.Context) (interface{}, error) {
var (
err error
tx *sql.Tx
)
tx, err = d.DB.BeginTx(tctx.Ctx, nil)
if err != nil {
return nil, errors.Trace(err)
}
defer func() {
if err != nil {
if rollbackErr := tx.Rollback(); rollbackErr != nil {
tctx.L().Warn("failed to rollback", zap.Error(errors.Trace(rollbackErr)))
}
} else {
err = tx.Commit()
}
}()
for i := range queries {
q := queries[i]
if tctx.L().Core().Enabled(zap.DebugLevel) {
tctx.L().Debug("exec in tx",
zap.String("query", utils.TruncateString(q, -1)),
zap.String("argument", utils.TruncateInterface(args[i], -1)))
}
if _, err = tx.ExecContext(tctx.Ctx, q, args[i]...); err != nil {
return nil, errors.Trace(err)
}
}
return nil, errors.Trace(err)
}
_, _, err := retryer.Apply(tctx, workFunc)
return err
}
// CloseBaseConn release BaseConn resource from BaseDB, and close BaseConn.
func (d *BaseDB) CloseBaseConn(conn *BaseConn) error {
d.mu.Lock()
defer d.mu.Unlock()
delete(d.conns, conn)
return conn.close()
}
// CloseBaseConnWithoutErr close the base connect and output a warn log if meets an error.
func CloseBaseConnWithoutErr(d *BaseDB, conn *BaseConn) {
if err1 := d.CloseBaseConn(conn); err1 != nil {
log.L().Warn("close db connection failed", zap.Error(err1))
}
}
// Close release *BaseDB resource.
func (d *BaseDB) Close() error {
if d == nil || d.DB == nil {
return nil
}
var err error
d.mu.Lock()
defer d.mu.Unlock()
for conn := range d.conns {
terr := conn.close()
if err == nil {
err = terr
}
}
terr := d.DB.Close()
for _, f := range d.doFuncInClose {
f()
}
if err == nil {
return terr
}
return err
}