b6a95a8cb3
* Dropped unused codekit config * Integrated dynamic and static bindata for public * Ignore public bindata * Add a general generate make task * Integrated flexible public assets into web command * Updated vendoring, added all missiong govendor deps * Made the linter happy with the bindata and dynamic code * Moved public bindata definition to modules directory * Ignoring the new bindata path now * Updated to the new public modules import path * Updated public bindata command and drop the new prefix
650 lines
16 KiB
Go
650 lines
16 KiB
Go
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package meta
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import (
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"encoding/binary"
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"encoding/json"
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"fmt"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/juju/errors"
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"github.com/pingcap/tidb/kv"
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"github.com/pingcap/tidb/model"
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"github.com/pingcap/tidb/structure"
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)
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var (
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globalIDMutex sync.Mutex
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)
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// Meta structure:
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// NextGlobalID -> int64
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// SchemaVersion -> int64
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// DBs -> {
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// DB:1 -> db meta data []byte
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// DB:2 -> db meta data []byte
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// }
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// DB:1 -> {
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// Table:1 -> table meta data []byte
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// Table:2 -> table meta data []byte
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// TID:1 -> int64
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// TID:2 -> int64
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// }
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//
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var (
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mNextGlobalIDKey = []byte("NextGlobalID")
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mSchemaVersionKey = []byte("SchemaVersionKey")
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mDBs = []byte("DBs")
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mDBPrefix = "DB"
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mTablePrefix = "Table"
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mTableIDPrefix = "TID"
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mBootstrapKey = []byte("BootstrapKey")
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)
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var (
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// ErrDBExists is the error for db exists.
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ErrDBExists = errors.New("database already exists")
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// ErrDBNotExists is the error for db not exists.
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ErrDBNotExists = errors.New("database doesn't exist")
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// ErrTableExists is the error for table exists.
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ErrTableExists = errors.New("table already exists")
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// ErrTableNotExists is the error for table not exists.
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ErrTableNotExists = errors.New("table doesn't exist")
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)
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// Meta is for handling meta information in a transaction.
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type Meta struct {
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txn *structure.TxStructure
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}
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// NewMeta creates a Meta in transaction txn.
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func NewMeta(txn kv.Transaction) *Meta {
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t := structure.NewStructure(txn, []byte{'m'})
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return &Meta{txn: t}
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}
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// GenGlobalID generates next id globally.
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func (m *Meta) GenGlobalID() (int64, error) {
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globalIDMutex.Lock()
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defer globalIDMutex.Unlock()
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return m.txn.Inc(mNextGlobalIDKey, 1)
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}
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// GetGlobalID gets current global id.
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func (m *Meta) GetGlobalID() (int64, error) {
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return m.txn.GetInt64(mNextGlobalIDKey)
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}
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func (m *Meta) dbKey(dbID int64) []byte {
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return []byte(fmt.Sprintf("%s:%d", mDBPrefix, dbID))
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}
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func (m *Meta) parseDatabaseID(key string) (int64, error) {
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seps := strings.Split(key, ":")
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if len(seps) != 2 {
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return 0, errors.Errorf("invalid db key %s", key)
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}
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n, err := strconv.ParseInt(seps[1], 10, 64)
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return n, errors.Trace(err)
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}
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func (m *Meta) autoTalbeIDKey(tableID int64) []byte {
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return []byte(fmt.Sprintf("%s:%d", mTableIDPrefix, tableID))
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}
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func (m *Meta) tableKey(tableID int64) []byte {
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return []byte(fmt.Sprintf("%s:%d", mTablePrefix, tableID))
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}
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func (m *Meta) parseTableID(key string) (int64, error) {
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seps := strings.Split(key, ":")
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if len(seps) != 2 {
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return 0, errors.Errorf("invalid table meta key %s", key)
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}
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n, err := strconv.ParseInt(seps[1], 10, 64)
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return n, errors.Trace(err)
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}
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// GenAutoTableID adds step to the auto id of the table and returns the sum.
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func (m *Meta) GenAutoTableID(dbID int64, tableID int64, step int64) (int64, error) {
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// Check if db exists.
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dbKey := m.dbKey(dbID)
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if err := m.checkDBExists(dbKey); err != nil {
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return 0, errors.Trace(err)
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}
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// Check if table exists.
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tableKey := m.tableKey(tableID)
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if err := m.checkTableExists(dbKey, tableKey); err != nil {
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return 0, errors.Trace(err)
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}
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return m.txn.HInc(dbKey, m.autoTalbeIDKey(tableID), step)
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}
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// GetAutoTableID gets current auto id with table id.
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func (m *Meta) GetAutoTableID(dbID int64, tableID int64) (int64, error) {
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return m.txn.HGetInt64(m.dbKey(dbID), m.autoTalbeIDKey(tableID))
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}
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// GetSchemaVersion gets current global schema version.
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func (m *Meta) GetSchemaVersion() (int64, error) {
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return m.txn.GetInt64(mSchemaVersionKey)
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}
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// GenSchemaVersion generates next schema version.
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func (m *Meta) GenSchemaVersion() (int64, error) {
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return m.txn.Inc(mSchemaVersionKey, 1)
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}
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func (m *Meta) checkDBExists(dbKey []byte) error {
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v, err := m.txn.HGet(mDBs, dbKey)
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if err != nil {
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return errors.Trace(err)
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} else if v == nil {
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return ErrDBNotExists
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}
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return nil
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}
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func (m *Meta) checkDBNotExists(dbKey []byte) error {
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v, err := m.txn.HGet(mDBs, dbKey)
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if err != nil {
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return errors.Trace(err)
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}
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if v != nil {
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return ErrDBExists
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}
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return nil
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}
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func (m *Meta) checkTableExists(dbKey []byte, tableKey []byte) error {
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v, err := m.txn.HGet(dbKey, tableKey)
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if err != nil {
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return errors.Trace(err)
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}
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if v == nil {
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return ErrTableNotExists
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}
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return nil
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}
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func (m *Meta) checkTableNotExists(dbKey []byte, tableKey []byte) error {
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v, err := m.txn.HGet(dbKey, tableKey)
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if err != nil {
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return errors.Trace(err)
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}
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if v != nil {
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return ErrTableExists
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}
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return nil
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}
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// CreateDatabase creates a database with db info.
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func (m *Meta) CreateDatabase(dbInfo *model.DBInfo) error {
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dbKey := m.dbKey(dbInfo.ID)
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if err := m.checkDBNotExists(dbKey); err != nil {
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return errors.Trace(err)
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}
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data, err := json.Marshal(dbInfo)
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if err != nil {
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return errors.Trace(err)
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}
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return m.txn.HSet(mDBs, dbKey, data)
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}
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// UpdateDatabase updates a database with db info.
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func (m *Meta) UpdateDatabase(dbInfo *model.DBInfo) error {
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dbKey := m.dbKey(dbInfo.ID)
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if err := m.checkDBExists(dbKey); err != nil {
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return errors.Trace(err)
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}
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data, err := json.Marshal(dbInfo)
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if err != nil {
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return errors.Trace(err)
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}
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return m.txn.HSet(mDBs, dbKey, data)
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}
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// CreateTable creates a table with tableInfo in database.
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func (m *Meta) CreateTable(dbID int64, tableInfo *model.TableInfo) error {
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// Check if db exists.
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dbKey := m.dbKey(dbID)
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if err := m.checkDBExists(dbKey); err != nil {
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return errors.Trace(err)
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}
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// Check if table exists.
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tableKey := m.tableKey(tableInfo.ID)
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if err := m.checkTableNotExists(dbKey, tableKey); err != nil {
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return errors.Trace(err)
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}
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data, err := json.Marshal(tableInfo)
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if err != nil {
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return errors.Trace(err)
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}
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return m.txn.HSet(dbKey, tableKey, data)
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}
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// DropDatabase drops whole database.
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func (m *Meta) DropDatabase(dbID int64) error {
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// Check if db exists.
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dbKey := m.dbKey(dbID)
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if err := m.txn.HClear(dbKey); err != nil {
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return errors.Trace(err)
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}
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if err := m.txn.HDel(mDBs, dbKey); err != nil {
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return errors.Trace(err)
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}
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return nil
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}
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// DropTable drops table in database.
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func (m *Meta) DropTable(dbID int64, tableID int64) error {
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// Check if db exists.
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dbKey := m.dbKey(dbID)
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if err := m.checkDBExists(dbKey); err != nil {
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return errors.Trace(err)
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}
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// Check if table exists.
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tableKey := m.tableKey(tableID)
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if err := m.checkTableExists(dbKey, tableKey); err != nil {
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return errors.Trace(err)
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}
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if err := m.txn.HDel(dbKey, tableKey); err != nil {
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return errors.Trace(err)
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}
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if err := m.txn.HDel(dbKey, m.autoTalbeIDKey(tableID)); err != nil {
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return errors.Trace(err)
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}
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return nil
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}
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// UpdateTable updates the table with table info.
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func (m *Meta) UpdateTable(dbID int64, tableInfo *model.TableInfo) error {
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// Check if db exists.
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dbKey := m.dbKey(dbID)
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if err := m.checkDBExists(dbKey); err != nil {
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return errors.Trace(err)
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}
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// Check if table exists.
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tableKey := m.tableKey(tableInfo.ID)
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if err := m.checkTableExists(dbKey, tableKey); err != nil {
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return errors.Trace(err)
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}
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data, err := json.Marshal(tableInfo)
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if err != nil {
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return errors.Trace(err)
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}
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err = m.txn.HSet(dbKey, tableKey, data)
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return errors.Trace(err)
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}
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// ListTables shows all tables in database.
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func (m *Meta) ListTables(dbID int64) ([]*model.TableInfo, error) {
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dbKey := m.dbKey(dbID)
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if err := m.checkDBExists(dbKey); err != nil {
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return nil, errors.Trace(err)
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}
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res, err := m.txn.HGetAll(dbKey)
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if err != nil {
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return nil, errors.Trace(err)
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}
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tables := make([]*model.TableInfo, 0, len(res)/2)
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for _, r := range res {
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// only handle table meta
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tableKey := string(r.Field)
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if !strings.HasPrefix(tableKey, mTablePrefix) {
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continue
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}
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tbInfo := &model.TableInfo{}
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err = json.Unmarshal(r.Value, tbInfo)
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if err != nil {
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return nil, errors.Trace(err)
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}
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tables = append(tables, tbInfo)
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}
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return tables, nil
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}
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// ListDatabases shows all databases.
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func (m *Meta) ListDatabases() ([]*model.DBInfo, error) {
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res, err := m.txn.HGetAll(mDBs)
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if err != nil {
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return nil, errors.Trace(err)
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}
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dbs := make([]*model.DBInfo, 0, len(res))
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for _, r := range res {
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dbInfo := &model.DBInfo{}
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err = json.Unmarshal(r.Value, dbInfo)
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if err != nil {
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return nil, errors.Trace(err)
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}
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dbs = append(dbs, dbInfo)
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}
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return dbs, nil
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}
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// GetDatabase gets the database value with ID.
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func (m *Meta) GetDatabase(dbID int64) (*model.DBInfo, error) {
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dbKey := m.dbKey(dbID)
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value, err := m.txn.HGet(mDBs, dbKey)
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if err != nil || value == nil {
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return nil, errors.Trace(err)
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}
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dbInfo := &model.DBInfo{}
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err = json.Unmarshal(value, dbInfo)
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return dbInfo, errors.Trace(err)
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}
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// GetTable gets the table value in database with tableID.
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func (m *Meta) GetTable(dbID int64, tableID int64) (*model.TableInfo, error) {
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// Check if db exists.
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dbKey := m.dbKey(dbID)
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if err := m.checkDBExists(dbKey); err != nil {
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return nil, errors.Trace(err)
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}
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tableKey := m.tableKey(tableID)
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value, err := m.txn.HGet(dbKey, tableKey)
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if err != nil || value == nil {
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return nil, errors.Trace(err)
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}
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tableInfo := &model.TableInfo{}
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err = json.Unmarshal(value, tableInfo)
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return tableInfo, errors.Trace(err)
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}
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// DDL job structure
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// DDLOnwer: []byte
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// DDLJobList: list jobs
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// DDLJobHistory: hash
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// DDLJobReorg: hash
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//
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// for multi DDL workers, only one can become the owner
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// to operate DDL jobs, and dispatch them to MR Jobs.
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var (
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mDDLJobOwnerKey = []byte("DDLJobOwner")
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mDDLJobListKey = []byte("DDLJobList")
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mDDLJobHistoryKey = []byte("DDLJobHistory")
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mDDLJobReorgKey = []byte("DDLJobReorg")
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)
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func (m *Meta) getJobOwner(key []byte) (*model.Owner, error) {
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value, err := m.txn.Get(key)
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if err != nil || value == nil {
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return nil, errors.Trace(err)
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}
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owner := &model.Owner{}
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err = json.Unmarshal(value, owner)
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return owner, errors.Trace(err)
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}
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// GetDDLJobOwner gets the current owner for DDL.
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func (m *Meta) GetDDLJobOwner() (*model.Owner, error) {
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return m.getJobOwner(mDDLJobOwnerKey)
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}
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func (m *Meta) setJobOwner(key []byte, o *model.Owner) error {
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b, err := json.Marshal(o)
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if err != nil {
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return errors.Trace(err)
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}
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return m.txn.Set(key, b)
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}
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// SetDDLJobOwner sets the current owner for DDL.
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func (m *Meta) SetDDLJobOwner(o *model.Owner) error {
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return m.setJobOwner(mDDLJobOwnerKey, o)
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}
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func (m *Meta) enQueueDDLJob(key []byte, job *model.Job) error {
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b, err := job.Encode()
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if err != nil {
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return errors.Trace(err)
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}
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return m.txn.RPush(key, b)
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}
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// EnQueueDDLJob adds a DDL job to the list.
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func (m *Meta) EnQueueDDLJob(job *model.Job) error {
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return m.enQueueDDLJob(mDDLJobListKey, job)
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}
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func (m *Meta) deQueueDDLJob(key []byte) (*model.Job, error) {
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value, err := m.txn.LPop(key)
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if err != nil || value == nil {
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return nil, errors.Trace(err)
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}
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job := &model.Job{}
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err = job.Decode(value)
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return job, errors.Trace(err)
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}
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// DeQueueDDLJob pops a DDL job from the list.
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func (m *Meta) DeQueueDDLJob() (*model.Job, error) {
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return m.deQueueDDLJob(mDDLJobListKey)
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}
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func (m *Meta) getDDLJob(key []byte, index int64) (*model.Job, error) {
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value, err := m.txn.LIndex(key, index)
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if err != nil || value == nil {
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return nil, errors.Trace(err)
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}
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job := &model.Job{}
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err = job.Decode(value)
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return job, errors.Trace(err)
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}
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// GetDDLJob returns the DDL job with index.
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func (m *Meta) GetDDLJob(index int64) (*model.Job, error) {
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job, err := m.getDDLJob(mDDLJobListKey, index)
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return job, errors.Trace(err)
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}
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func (m *Meta) updateDDLJob(index int64, job *model.Job, key []byte) error {
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// TODO: use timestamp allocated by TSO
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job.LastUpdateTS = time.Now().UnixNano()
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b, err := job.Encode()
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if err != nil {
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return errors.Trace(err)
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}
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return m.txn.LSet(key, index, b)
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}
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// UpdateDDLJob updates the DDL job with index.
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func (m *Meta) UpdateDDLJob(index int64, job *model.Job) error {
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return m.updateDDLJob(index, job, mDDLJobListKey)
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}
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// DDLJobQueueLen returns the DDL job queue length.
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func (m *Meta) DDLJobQueueLen() (int64, error) {
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return m.txn.LLen(mDDLJobListKey)
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}
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func (m *Meta) jobIDKey(id int64) []byte {
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b := make([]byte, 8)
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binary.BigEndian.PutUint64(b, uint64(id))
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return b
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}
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func (m *Meta) addHistoryDDLJob(key []byte, job *model.Job) error {
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b, err := job.Encode()
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if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
|
|
return m.txn.HSet(key, m.jobIDKey(job.ID), b)
|
|
}
|
|
|
|
// AddHistoryDDLJob adds DDL job to history.
|
|
func (m *Meta) AddHistoryDDLJob(job *model.Job) error {
|
|
return m.addHistoryDDLJob(mDDLJobHistoryKey, job)
|
|
}
|
|
|
|
func (m *Meta) getHistoryDDLJob(key []byte, id int64) (*model.Job, error) {
|
|
value, err := m.txn.HGet(key, m.jobIDKey(id))
|
|
if err != nil || value == nil {
|
|
return nil, errors.Trace(err)
|
|
}
|
|
|
|
job := &model.Job{}
|
|
err = job.Decode(value)
|
|
return job, errors.Trace(err)
|
|
}
|
|
|
|
// GetHistoryDDLJob gets a history DDL job.
|
|
func (m *Meta) GetHistoryDDLJob(id int64) (*model.Job, error) {
|
|
return m.getHistoryDDLJob(mDDLJobHistoryKey, id)
|
|
}
|
|
|
|
// IsBootstrapped returns whether we have already run bootstrap or not.
|
|
// return true means we don't need doing any other bootstrap.
|
|
func (m *Meta) IsBootstrapped() (bool, error) {
|
|
value, err := m.txn.GetInt64(mBootstrapKey)
|
|
if err != nil {
|
|
return false, errors.Trace(err)
|
|
}
|
|
return value == 1, nil
|
|
}
|
|
|
|
// FinishBootstrap finishes bootstrap.
|
|
func (m *Meta) FinishBootstrap() error {
|
|
err := m.txn.Set(mBootstrapKey, []byte("1"))
|
|
return errors.Trace(err)
|
|
}
|
|
|
|
// UpdateDDLReorgHandle saves the job reorganization latest processed handle for later resuming.
|
|
func (m *Meta) UpdateDDLReorgHandle(job *model.Job, handle int64) error {
|
|
err := m.txn.HSet(mDDLJobReorgKey, m.jobIDKey(job.ID), []byte(strconv.FormatInt(handle, 10)))
|
|
return errors.Trace(err)
|
|
}
|
|
|
|
// RemoveDDLReorgHandle removes the job reorganization handle.
|
|
func (m *Meta) RemoveDDLReorgHandle(job *model.Job) error {
|
|
err := m.txn.HDel(mDDLJobReorgKey, m.jobIDKey(job.ID))
|
|
return errors.Trace(err)
|
|
}
|
|
|
|
// GetDDLReorgHandle gets the latest processed handle.
|
|
func (m *Meta) GetDDLReorgHandle(job *model.Job) (int64, error) {
|
|
value, err := m.txn.HGetInt64(mDDLJobReorgKey, m.jobIDKey(job.ID))
|
|
return value, errors.Trace(err)
|
|
}
|
|
|
|
// DDL background job structure
|
|
// BgJobOnwer: []byte
|
|
// BgJobList: list jobs
|
|
// BgJobHistory: hash
|
|
// BgJobReorg: hash
|
|
//
|
|
// for multi background worker, only one can become the owner
|
|
// to operate background job, and dispatch them to MR background job.
|
|
|
|
var (
|
|
mBgJobOwnerKey = []byte("BgJobOwner")
|
|
mBgJobListKey = []byte("BgJobList")
|
|
mBgJobHistoryKey = []byte("BgJobHistory")
|
|
)
|
|
|
|
// UpdateBgJob updates the background job with index.
|
|
func (m *Meta) UpdateBgJob(index int64, job *model.Job) error {
|
|
return m.updateDDLJob(index, job, mBgJobListKey)
|
|
}
|
|
|
|
// GetBgJob returns the background job with index.
|
|
func (m *Meta) GetBgJob(index int64) (*model.Job, error) {
|
|
job, err := m.getDDLJob(mBgJobListKey, index)
|
|
|
|
return job, errors.Trace(err)
|
|
}
|
|
|
|
// EnQueueBgJob adds a background job to the list.
|
|
func (m *Meta) EnQueueBgJob(job *model.Job) error {
|
|
return m.enQueueDDLJob(mBgJobListKey, job)
|
|
}
|
|
|
|
// BgJobQueueLen returns the background job queue length.
|
|
func (m *Meta) BgJobQueueLen() (int64, error) {
|
|
return m.txn.LLen(mBgJobListKey)
|
|
}
|
|
|
|
// AddHistoryBgJob adds background job to history.
|
|
func (m *Meta) AddHistoryBgJob(job *model.Job) error {
|
|
return m.addHistoryDDLJob(mBgJobHistoryKey, job)
|
|
}
|
|
|
|
// GetHistoryBgJob gets a history background job.
|
|
func (m *Meta) GetHistoryBgJob(id int64) (*model.Job, error) {
|
|
return m.getHistoryDDLJob(mBgJobHistoryKey, id)
|
|
}
|
|
|
|
// DeQueueBgJob pops a background job from the list.
|
|
func (m *Meta) DeQueueBgJob() (*model.Job, error) {
|
|
return m.deQueueDDLJob(mBgJobListKey)
|
|
}
|
|
|
|
// GetBgJobOwner gets the current background job owner.
|
|
func (m *Meta) GetBgJobOwner() (*model.Owner, error) {
|
|
return m.getJobOwner(mBgJobOwnerKey)
|
|
}
|
|
|
|
// SetBgJobOwner sets the current background job owner.
|
|
func (m *Meta) SetBgJobOwner(o *model.Owner) error {
|
|
return m.setJobOwner(mBgJobOwnerKey, o)
|
|
}
|