Golang Job.DecodeArgs方法代碼示例

func (d *ddl) onModifyColumn(t *meta.Meta, job *model.Job) error {
	tblInfo, err := d.getTableInfo(t, job)
	if err != nil {
		return errors.Trace(err)
	}
	newCol := &model.ColumnInfo{}
	oldColName := &model.CIStr{}
	err = job.DecodeArgs(newCol, oldColName)
	if err != nil {
		job.State = model.JobCancelled
		return errors.Trace(err)
	}

	oldCol := findCol(tblInfo.Columns, oldColName.L)
	if oldCol == nil || oldCol.State != model.StatePublic {
		job.State = model.JobCancelled
		return infoschema.ErrColumnNotExists.GenByArgs(newCol.Name, tblInfo.Name)
	}
	*oldCol = *newCol
	err = t.UpdateTable(job.SchemaID, tblInfo)
	if err != nil {
		job.State = model.JobCancelled
		return errors.Trace(err)
	}

	ver, err := updateSchemaVersion(t, job)
	if err != nil {
		return errors.Trace(err)
	}
	job.SchemaState = model.StatePublic
	job.State = model.JobDone
	addTableHistoryInfo(job, ver, tblInfo)
	return nil
}

func (d *ddl) delReorgSchema(t *meta.Meta, job *model.Job) error {
	dbInfo := &model.DBInfo{}
	if err := job.DecodeArgs(dbInfo); err != nil {
		// arg error, cancel this job.
		job.State = model.JobCancelled
		return errors.Trace(err)
	}

	tables, err := t.ListTables(dbInfo.ID)
	if terror.ErrorEqual(meta.ErrDBNotExists, err) {
		job.State = model.JobDone
		return nil
	}
	if err != nil {
		return errors.Trace(err)
	}

	if err = d.dropSchemaData(dbInfo, tables); err != nil {
		return errors.Trace(err)
	}

	// finish this background job
	job.SchemaState = model.StateNone
	job.State = model.JobDone

	return nil
}

func (d *ddl) onDropForeignKey(t *meta.Meta, job *model.Job) error {
	schemaID := job.SchemaID
	tblInfo, err := d.getTableInfo(t, job)
	if err != nil {
		return errors.Trace(err)
	}

	var (
		fkName model.CIStr
		found  bool
		fkInfo model.FKInfo
	)
	err = job.DecodeArgs(&fkName)
	if err != nil {
		job.State = model.JobCancelled
		return errors.Trace(err)
	}

	for _, fk := range tblInfo.ForeignKeys {
		if fk.Name.L == fkName.L {
			found = true
			fkInfo = *fk
		}
	}

	if !found {
		return infoschema.ErrForeignKeyNotExists.Gen("foreign key doesn't exist", fkName)
	}

	nfks := tblInfo.ForeignKeys[:0]
	for _, fk := range tblInfo.ForeignKeys {
		if fk.Name.L != fkName.L {
			nfks = append(nfks, fk)
		}
	}
	tblInfo.ForeignKeys = nfks

	_, err = t.GenSchemaVersion()
	if err != nil {
		return errors.Trace(err)
	}

	switch fkInfo.State {
	case model.StatePublic:
		// We just support record the foreign key, so we just make it none.
		// public -> none
		job.SchemaState = model.StateNone
		fkInfo.State = model.StateNone
		err = t.UpdateTable(schemaID, tblInfo)
		if err != nil {
			return errors.Trace(err)
		}
		// finish this job
		job.State = model.JobDone
		return nil
	default:
		return ErrInvalidForeignKeyState.Gen("invalid fk state %v", fkInfo.State)
	}

}

func (d *ddl) delReorgTable(t *meta.Meta, job *model.Job) error {
	tblInfo := &model.TableInfo{}
	err := job.DecodeArgs(tblInfo)
	if err != nil {
		// arg error, cancel this job.
		job.State = model.JobCancelled
		return errors.Trace(err)
	}
	tblInfo.State = model.StateDeleteReorganization
	tbl, err := d.getTable(job.SchemaID, tblInfo)
	if err != nil {
		return errors.Trace(err)
	}

	err = d.dropTableData(tbl)
	if err != nil {
		return errors.Trace(err)
	}

	// finish this background job
	job.SchemaState = model.StateNone
	job.State = model.JobDone

	return nil
}

func (d *ddl) onCreateSchema(t *meta.Meta, job *model.Job) error {
	schemaID := job.SchemaID
	var name model.CIStr
	if err := job.DecodeArgs(&name); err != nil {
		// arg error, cancel this job.
		job.State = model.JobCancelled
		return errors.Trace(err)
	}

	dbInfo := &model.DBInfo{
		ID:    schemaID,
		Name:  name,
		State: model.StateNone,
	}

	dbs, err := t.ListDatabases()
	if err != nil {
		return errors.Trace(err)
	}

	for _, db := range dbs {
		if db.Name.L == name.L {
			if db.ID != schemaID {
				// database exists, can't create, we should cancel this job now.
				job.State = model.JobCancelled
				return errors.Trace(ErrExists)
			}

			dbInfo = db
		}
	}

	_, err = t.GenSchemaVersion()
	if err != nil {
		return errors.Trace(err)
	}

	switch dbInfo.State {
	case model.StateNone:
		// none -> public
		job.SchemaState = model.StatePublic
		dbInfo.State = model.StatePublic
		err = t.CreateDatabase(dbInfo)
		if err != nil {
			return errors.Trace(err)
		}
		// finish this job
		job.State = model.JobDone
		return nil
	default:
		// we can't enter here.
		return errors.Errorf("invalid db state %v", dbInfo.State)
	}
}

func (d *ddl) onCreateTable(t *meta.Meta, job *model.Job) error {
	schemaID := job.SchemaID
	tbInfo := &model.TableInfo{}
	if err := job.DecodeArgs(tbInfo); err != nil {
		// arg error, cancel this job.
		job.State = model.JobCancelled
		return errors.Trace(err)
	}

	tbInfo.State = model.StateNone

	tables, err := t.ListTables(schemaID)
	if terror.ErrorEqual(err, meta.ErrDBNotExists) {
		job.State = model.JobCancelled
		return errors.Trace(infoschema.ErrDatabaseNotExists)
	} else if err != nil {
		return errors.Trace(err)
	}

	for _, tbl := range tables {
		if tbl.Name.L == tbInfo.Name.L {
			if tbl.ID != tbInfo.ID {
				// table exists, can't create, we should cancel this job now.
				job.State = model.JobCancelled
				return errors.Trace(infoschema.ErrTableExists)
			}

			tbInfo = tbl
		}
	}

	ver, err := updateSchemaVersion(t, job)
	if err != nil {
		return errors.Trace(err)
	}

	switch tbInfo.State {
	case model.StateNone:
		// none -> public
		job.SchemaState = model.StatePublic
		tbInfo.State = model.StatePublic
		err = t.CreateTable(schemaID, tbInfo)
		if err != nil {
			return errors.Trace(err)
		}
		// finish this job
		job.State = model.JobDone
		addTableHistoryInfo(job, ver, tbInfo)
		return nil
	default:
		return ErrInvalidTableState.Gen("invalid table state %v", tbInfo.State)
	}
}

func (d *ddl) onCreateSchema(t *meta.Meta, job *model.Job) error {
	schemaID := job.SchemaID
	dbInfo := &model.DBInfo{}
	if err := job.DecodeArgs(dbInfo); err != nil {
		// arg error, cancel this job.
		job.State = model.JobCancelled
		return errors.Trace(err)
	}

	dbInfo.ID = schemaID
	dbInfo.State = model.StateNone

	dbs, err := t.ListDatabases()
	if err != nil {
		return errors.Trace(err)
	}

	for _, db := range dbs {
		if db.Name.L == dbInfo.Name.L {
			if db.ID != schemaID {
				// database exists, can't create, we should cancel this job now.
				job.State = model.JobCancelled
				return errors.Trace(infoschema.ErrDatabaseExists)
			}
			dbInfo = db
		}
	}

	ver, err := updateSchemaVersion(t, job)
	if err != nil {
		return errors.Trace(err)
	}

	switch dbInfo.State {
	case model.StateNone:
		// none -> public
		job.SchemaState = model.StatePublic
		dbInfo.State = model.StatePublic
		err = t.CreateDatabase(dbInfo)
		if err != nil {
			return errors.Trace(err)
		}
		// finish this job
		job.State = model.JobDone
		addDBHistoryInfo(job, ver, dbInfo)
		return nil
	default:
		// we can't enter here.
		return errors.Errorf("invalid db state %v", dbInfo.State)
	}
}

func (d *ddl) delReorgTable(t *meta.Meta, job *model.Job) error {
	var startKey kv.Key
	if err := job.DecodeArgs(&startKey); err != nil {
		job.State = model.JobCancelled
		return errors.Trace(err)
	}

	limit := reorgTableDeleteLimit
	delCount, err := d.dropTableData(startKey, job, limit)
	if err != nil {
		return errors.Trace(err)
	}
	// Finish this background job.
	if delCount < limit {
		job.SchemaState = model.StateNone
		job.State = model.JobDone
	}
	return nil
}

// onTruncateTable delete old table meta, and creates a new table identical to old table except for table ID.
// As all the old data is encoded with old table ID, it can not be accessed any more.
// A background job will be created to delete old data.
func (d *ddl) onTruncateTable(t *meta.Meta, job *model.Job) error {
	schemaID := job.SchemaID
	tableID := job.TableID
	var newTableID int64
	err := job.DecodeArgs(&newTableID)
	if err != nil {
		job.State = model.JobCancelled
		return errors.Trace(err)
	}
	tblInfo, err := t.GetTable(schemaID, tableID)
	if terror.ErrorEqual(err, meta.ErrDBNotExists) {
		job.State = model.JobCancelled
		return errors.Trace(infoschema.ErrDatabaseNotExists)
	} else if err != nil {
		return errors.Trace(err)
	}
	if tblInfo == nil {
		job.State = model.JobCancelled
		return errors.Trace(infoschema.ErrTableNotExists)
	}

	err = t.DropTable(schemaID, tableID)
	if err != nil {
		job.State = model.JobCancelled
		return errors.Trace(err)
	}
	tblInfo.ID = newTableID
	err = t.CreateTable(schemaID, tblInfo)
	if err != nil {
		job.State = model.JobCancelled
		return errors.Trace(err)
	}

	ver, err := updateSchemaVersion(t, job)
	if err != nil {
		return errors.Trace(err)
	}
	job.State = model.JobDone
	addTableHistoryInfo(job, ver, tblInfo)
	startKey := tablecodec.EncodeTablePrefix(tableID)
	job.Args = append(job.Args, startKey)
	return nil
}

func (d *ddl) delReorgSchema(t *meta.Meta, job *model.Job) error {
	var startKey kv.Key
	var tableIDs []int64
	if err := job.DecodeArgs(&tableIDs, &startKey); err != nil {
		job.State = model.JobCancelled
		return errors.Trace(err)
	}

	isFinished, err := d.dropSchemaData(tableIDs, startKey, job, t)
	if err != nil {
		return errors.Trace(err)
	}
	if !isFinished {
		return nil
	}

	// finish this background job
	job.SchemaState = model.StateNone
	job.State = model.JobDone

	return nil
}

func (d *ddl) onCreateForeignKey(t *meta.Meta, job *model.Job) error {
	schemaID := job.SchemaID
	tblInfo, err := d.getTableInfo(t, job)
	if err != nil {
		return errors.Trace(err)
	}

	var fkInfo model.FKInfo
	err = job.DecodeArgs(&fkInfo)
	if err != nil {
		job.State = model.JobCancelled
		return errors.Trace(err)
	}
	fkInfo.ID = allocateIndexID(tblInfo)
	tblInfo.ForeignKeys = append(tblInfo.ForeignKeys, &fkInfo)
	ver, err := updateSchemaVersion(t, job)
	if err != nil {
		return errors.Trace(err)
	}

	switch fkInfo.State {
	case model.StateNone:
		// We just support record the foreign key, so we just make it public.
		// none -> public
		job.SchemaState = model.StatePublic
		fkInfo.State = model.StatePublic
		err = t.UpdateTable(schemaID, tblInfo)
		if err != nil {
			return errors.Trace(err)
		}
		// Finish this job.
		job.State = model.JobDone
		addTableHistoryInfo(job, ver, tblInfo)
		return nil
	default:
		return ErrInvalidForeignKeyState.Gen("invalid fk state %v", fkInfo.State)
	}
}

// updateSchemaVersion increments the schema version by 1 and sets SchemaDiff.
func updateSchemaVersion(t *meta.Meta, job *model.Job) (int64, error) {
	schemaVersion, err := t.GenSchemaVersion()
	if err != nil {
		return 0, errors.Trace(err)
	}
	diff := &model.SchemaDiff{
		Version:  schemaVersion,
		Type:     job.Type,
		SchemaID: job.SchemaID,
	}
	if job.Type == model.ActionTruncateTable {
		// Truncate table has two table ID, should be handled differently.
		err = job.DecodeArgs(&diff.TableID)
		if err != nil {
			return 0, errors.Trace(err)
		}
		diff.OldTableID = job.TableID
	} else {
		diff.TableID = job.TableID
	}
	err = t.SetSchemaDiff(schemaVersion, diff)
	return schemaVersion, errors.Trace(err)
}

func (d *ddl) onDropIndex(t *meta.Meta, job *model.Job) error {
	schemaID := job.SchemaID
	tblInfo, err := d.getTableInfo(t, job)
	if err != nil {
		return errors.Trace(err)
	}

	var indexName model.CIStr
	if err = job.DecodeArgs(&indexName); err != nil {
		job.State = model.JobCancelled
		return errors.Trace(err)
	}

	var indexInfo *model.IndexInfo
	for _, idx := range tblInfo.Indices {
		if idx.Name.L == indexName.L {
			indexInfo = idx
		}
	}

	if indexInfo == nil {
		job.State = model.JobCancelled
		return ErrCantDropFieldOrKey.Gen("index %s doesn't exist", indexName)
	}

	_, err = t.GenSchemaVersion()
	if err != nil {
		return errors.Trace(err)
	}

	switch indexInfo.State {
	case model.StatePublic:
		// public -> write only
		job.SchemaState = model.StateWriteOnly
		indexInfo.State = model.StateWriteOnly
		err = t.UpdateTable(schemaID, tblInfo)
		return errors.Trace(err)
	case model.StateWriteOnly:
		// write only -> delete only
		job.SchemaState = model.StateDeleteOnly
		indexInfo.State = model.StateDeleteOnly
		err = t.UpdateTable(schemaID, tblInfo)
		return errors.Trace(err)
	case model.StateDeleteOnly:
		// delete only -> reorganization
		job.SchemaState = model.StateDeleteReorganization
		indexInfo.State = model.StateDeleteReorganization
		err = t.UpdateTable(schemaID, tblInfo)
		return errors.Trace(err)
	case model.StateDeleteReorganization:
		// reorganization -> absent
		tbl, err := d.getTable(schemaID, tblInfo)
		if err != nil {
			return errors.Trace(err)
		}

		err = d.runReorgJob(func() error {
			return d.dropTableIndex(tbl, indexInfo)
		})

		if terror.ErrorEqual(err, errWaitReorgTimeout) {
			// if timeout, we should return, check for the owner and re-wait job done.
			return nil
		}
		if err != nil {
			return errors.Trace(err)
		}

		// all reorganization jobs done, drop this index
		newIndices := make([]*model.IndexInfo, 0, len(tblInfo.Indices))
		for _, idx := range tblInfo.Indices {
			if idx.Name.L != indexName.L {
				newIndices = append(newIndices, idx)
			}
		}
		tblInfo.Indices = newIndices
		// set column index flag.
		dropIndexColumnFlag(tblInfo, indexInfo)
		if err = t.UpdateTable(schemaID, tblInfo); err != nil {
			return errors.Trace(err)
		}

		// finish this job
		job.SchemaState = model.StateNone
		job.State = model.JobDone
		return nil
	default:
		return ErrInvalidTableState.Gen("invalid table state %v", tblInfo.State)
	}
}

func (d *ddl) onCreateIndex(t *meta.Meta, job *model.Job) error {
	schemaID := job.SchemaID
	tblInfo, err := d.getTableInfo(t, job)
	if err != nil {
		return errors.Trace(err)
	}

	var (
		unique      bool
		indexName   model.CIStr
		indexID     int64
		idxColNames []*ast.IndexColName
	)

	err = job.DecodeArgs(&unique, &indexName, &indexID, &idxColNames)
	if err != nil {
		job.State = model.JobCancelled
		return errors.Trace(err)
	}

	var indexInfo *model.IndexInfo
	for _, idx := range tblInfo.Indices {
		if idx.Name.L == indexName.L {
			if idx.State == model.StatePublic {
				// we already have a index with same index name
				job.State = model.JobCancelled
				return infoschema.ErrIndexExists.Gen("CREATE INDEX: index already exist %s", indexName)
			}

			indexInfo = idx
		}
	}

	if indexInfo == nil {
		indexInfo, err = buildIndexInfo(tblInfo, unique, indexName, indexID, idxColNames)
		if err != nil {
			job.State = model.JobCancelled
			return errors.Trace(err)
		}
		tblInfo.Indices = append(tblInfo.Indices, indexInfo)
	}

	_, err = t.GenSchemaVersion()
	if err != nil {
		return errors.Trace(err)
	}

	switch indexInfo.State {
	case model.StateNone:
		// none -> delete only
		job.SchemaState = model.StateDeleteOnly
		indexInfo.State = model.StateDeleteOnly
		err = t.UpdateTable(schemaID, tblInfo)
		return errors.Trace(err)
	case model.StateDeleteOnly:
		// delete only -> write only
		job.SchemaState = model.StateWriteOnly
		indexInfo.State = model.StateWriteOnly
		err = t.UpdateTable(schemaID, tblInfo)
		return errors.Trace(err)
	case model.StateWriteOnly:
		// write only -> reorganization
		job.SchemaState = model.StateWriteReorganization
		indexInfo.State = model.StateWriteReorganization
		// initialize SnapshotVer to 0 for later reorganization check.
		job.SnapshotVer = 0
		err = t.UpdateTable(schemaID, tblInfo)
		return errors.Trace(err)
	case model.StateWriteReorganization:
		// reorganization -> public
		reorgInfo, err := d.getReorgInfo(t, job)
		if err != nil || reorgInfo.first {
			// if we run reorg firstly, we should update the job snapshot version
			// and then run the reorg next time.
			return errors.Trace(err)
		}

		var tbl table.Table
		tbl, err = d.getTable(schemaID, tblInfo)
		if err != nil {
			return errors.Trace(err)
		}

		err = d.runReorgJob(func() error {
			return d.addTableIndex(tbl, indexInfo, reorgInfo)
		})

		if terror.ErrorEqual(err, errWaitReorgTimeout) {
			// if timeout, we should return, check for the owner and re-wait job done.
			return nil
		}
		if err != nil {
			return errors.Trace(err)
		}

		indexInfo.State = model.StatePublic
		// set column index flag.
		addIndexColumnFlag(tblInfo, indexInfo)
		if err = t.UpdateTable(schemaID, tblInfo); err != nil {
			return errors.Trace(err)
//.........這裏部分代碼省略.........

func (d *ddl) onCreateIndex(t *meta.Meta, job *model.Job) error {
	// Handle rollback job.
	if job.State == model.JobRollback {
		err := d.onDropIndex(t, job)
		if err != nil {
			return errors.Trace(err)
		}
		return nil
	}

	// Handle normal job.
	schemaID := job.SchemaID
	tblInfo, err := d.getTableInfo(t, job)
	if err != nil {
		return errors.Trace(err)
	}

	var (
		unique      bool
		indexName   model.CIStr
		idxColNames []*ast.IndexColName
	)
	err = job.DecodeArgs(&unique, &indexName, &idxColNames)
	if err != nil {
		job.State = model.JobCancelled
		return errors.Trace(err)
	}

	indexInfo := findIndexByName(indexName.L, tblInfo.Indices)
	if indexInfo != nil && indexInfo.State == model.StatePublic {
		job.State = model.JobCancelled
		return errDupKeyName.Gen("index already exist %s", indexName)
	}

	if indexInfo == nil {
		indexInfo, err = buildIndexInfo(tblInfo, unique, indexName, idxColNames)
		if err != nil {
			job.State = model.JobCancelled
			return errors.Trace(err)
		}
		indexInfo.ID = allocateIndexID(tblInfo)
		tblInfo.Indices = append(tblInfo.Indices, indexInfo)
	}

	ver, err := updateSchemaVersion(t, job)
	if err != nil {
		return errors.Trace(err)
	}

	switch indexInfo.State {
	case model.StateNone:
		// none -> delete only
		job.SchemaState = model.StateDeleteOnly
		indexInfo.State = model.StateDeleteOnly
		err = t.UpdateTable(schemaID, tblInfo)
		return errors.Trace(err)
	case model.StateDeleteOnly:
		// delete only -> write only
		job.SchemaState = model.StateWriteOnly
		indexInfo.State = model.StateWriteOnly
		err = t.UpdateTable(schemaID, tblInfo)
		return errors.Trace(err)
	case model.StateWriteOnly:
		// write only -> reorganization
		job.SchemaState = model.StateWriteReorganization
		indexInfo.State = model.StateWriteReorganization
		// Initialize SnapshotVer to 0 for later reorganization check.
		job.SnapshotVer = 0
		err = t.UpdateTable(schemaID, tblInfo)
		return errors.Trace(err)
	case model.StateWriteReorganization:
		// reorganization -> public
		reorgInfo, err := d.getReorgInfo(t, job)
		if err != nil || reorgInfo.first {
			// If we run reorg firstly, we should update the job snapshot version
			// and then run the reorg next time.
			return errors.Trace(err)
		}

		var tbl table.Table
		tbl, err = d.getTable(schemaID, tblInfo)
		if err != nil {
			return errors.Trace(err)
		}

		err = d.runReorgJob(func() error {
			return d.addTableIndex(tbl, indexInfo, reorgInfo, job)
		})
		if terror.ErrorEqual(err, errWaitReorgTimeout) {
			// if timeout, we should return, check for the owner and re-wait job done.
			return nil
		}
		if err != nil {
			if terror.ErrorEqual(err, kv.ErrKeyExists) {
				log.Warnf("[ddl] run DDL job %v err %v, convert job to rollback job", job, err)
				err = d.convert2RollbackJob(t, job, tblInfo, indexInfo)
			}
			return errors.Trace(err)
		}

//.........這裏部分代碼省略.........