コード例 #1
0
ファイル: statement_executor.go プロジェクト: li-ang/influxdb
func (e *StatementExecutor) executeShowMeasurementsStatement(q *influxql.ShowMeasurementsStatement, ctx *influxql.ExecutionContext) error {
	if q.Database == "" {
		return ErrDatabaseNameRequired
	}

	measurements, err := e.TSDBStore.Measurements(q.Database, q.Condition)
	if err != nil || len(measurements) == 0 {
		return ctx.Send(&influxql.Result{
			StatementID: ctx.StatementID,
			Err:         err,
		})
	}

	if q.Offset > 0 {
		if q.Offset >= len(measurements) {
			measurements = nil
		} else {
			measurements = measurements[q.Offset:]
		}
	}

	if q.Limit > 0 {
		if q.Limit < len(measurements) {
			measurements = measurements[:q.Limit]
		}
	}

	values := make([][]interface{}, len(measurements))
	for i, m := range measurements {
		values[i] = []interface{}{m}
	}

	if len(values) == 0 {
		return ctx.Send(&influxql.Result{
			StatementID: ctx.StatementID,
		})
	}

	return ctx.Send(&influxql.Result{
		StatementID: ctx.StatementID,
		Series: []*models.Row{{
			Name:    "measurements",
			Columns: []string{"name"},
			Values:  values,
		}},
	})
}
コード例 #2
0
ファイル: statement_executor.go プロジェクト: li-ang/influxdb
func (e *StatementExecutor) executeShowTagValues(q *influxql.ShowTagValuesStatement, ctx *influxql.ExecutionContext) error {
	if q.Database == "" {
		return ErrDatabaseNameRequired
	}

	tagValues, err := e.TSDBStore.TagValues(q.Database, q.Condition)
	if err != nil {
		return ctx.Send(&influxql.Result{
			StatementID: ctx.StatementID,
			Err:         err,
		})
	}

	emitted := false
	for _, m := range tagValues {
		values := m.Values

		if q.Offset > 0 {
			if q.Offset >= len(values) {
				values = nil
			} else {
				values = values[q.Offset:]
			}
		}

		if q.Limit > 0 {
			if q.Limit < len(values) {
				values = values[:q.Limit]
			}
		}

		if len(values) == 0 {
			continue
		}

		row := &models.Row{
			Name:    m.Measurement,
			Columns: []string{"key", "value"},
			Values:  make([][]interface{}, len(values)),
		}
		for i, v := range values {
			row.Values[i] = []interface{}{v.Key, v.Value}
		}

		if err := ctx.Send(&influxql.Result{
			StatementID: ctx.StatementID,
			Series:      []*models.Row{row},
		}); err != nil {
			return err
		}
		emitted = true
	}

	// Ensure at least one result is emitted.
	if !emitted {
		return ctx.Send(&influxql.Result{
			StatementID: ctx.StatementID,
		})
	}
	return nil
}
コード例 #3
0
ファイル: statement_executor.go プロジェクト: li-ang/influxdb
func (e *StatementExecutor) ExecuteStatement(stmt influxql.Statement, ctx influxql.ExecutionContext) error {
	// Select statements are handled separately so that they can be streamed.
	if stmt, ok := stmt.(*influxql.SelectStatement); ok {
		return e.executeSelectStatement(stmt, &ctx)
	}

	var rows models.Rows
	var messages []*influxql.Message
	var err error
	switch stmt := stmt.(type) {
	case *influxql.AlterRetentionPolicyStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeAlterRetentionPolicyStatement(stmt)
	case *influxql.CreateContinuousQueryStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeCreateContinuousQueryStatement(stmt)
	case *influxql.CreateDatabaseStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeCreateDatabaseStatement(stmt)
	case *influxql.CreateRetentionPolicyStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeCreateRetentionPolicyStatement(stmt)
	case *influxql.CreateSubscriptionStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeCreateSubscriptionStatement(stmt)
	case *influxql.CreateUserStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeCreateUserStatement(stmt)
	case *influxql.DeleteSeriesStatement:
		err = e.executeDeleteSeriesStatement(stmt, ctx.Database)
	case *influxql.DropContinuousQueryStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeDropContinuousQueryStatement(stmt)
	case *influxql.DropDatabaseStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeDropDatabaseStatement(stmt)
	case *influxql.DropMeasurementStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeDropMeasurementStatement(stmt, ctx.Database)
	case *influxql.DropSeriesStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeDropSeriesStatement(stmt, ctx.Database)
	case *influxql.DropRetentionPolicyStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeDropRetentionPolicyStatement(stmt)
	case *influxql.DropShardStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeDropShardStatement(stmt)
	case *influxql.DropSubscriptionStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeDropSubscriptionStatement(stmt)
	case *influxql.DropUserStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeDropUserStatement(stmt)
	case *influxql.GrantStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeGrantStatement(stmt)
	case *influxql.GrantAdminStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeGrantAdminStatement(stmt)
	case *influxql.RevokeStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeRevokeStatement(stmt)
	case *influxql.RevokeAdminStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeRevokeAdminStatement(stmt)
	case *influxql.ShowContinuousQueriesStatement:
		rows, err = e.executeShowContinuousQueriesStatement(stmt)
	case *influxql.ShowDatabasesStatement:
		rows, err = e.executeShowDatabasesStatement(stmt)
	case *influxql.ShowDiagnosticsStatement:
		rows, err = e.executeShowDiagnosticsStatement(stmt)
	case *influxql.ShowGrantsForUserStatement:
		rows, err = e.executeShowGrantsForUserStatement(stmt)
	case *influxql.ShowMeasurementsStatement:
		return e.executeShowMeasurementsStatement(stmt, &ctx)
	case *influxql.ShowRetentionPoliciesStatement:
		rows, err = e.executeShowRetentionPoliciesStatement(stmt)
	case *influxql.ShowShardsStatement:
		rows, err = e.executeShowShardsStatement(stmt)
	case *influxql.ShowShardGroupsStatement:
		rows, err = e.executeShowShardGroupsStatement(stmt)
	case *influxql.ShowStatsStatement:
		rows, err = e.executeShowStatsStatement(stmt)
	case *influxql.ShowSubscriptionsStatement:
		rows, err = e.executeShowSubscriptionsStatement(stmt)
	case *influxql.ShowTagValuesStatement:
		return e.executeShowTagValues(stmt, &ctx)
	case *influxql.ShowUsersStatement:
		rows, err = e.executeShowUsersStatement(stmt)
	case *influxql.SetPasswordUserStatement:
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}
		err = e.executeSetPasswordUserStatement(stmt)
	case *influxql.ShowQueriesStatement, *influxql.KillQueryStatement:
		// Send query related statements to the task manager.
		return e.TaskManager.ExecuteStatement(stmt, ctx)
	default:
		return influxql.ErrInvalidQuery
	}

	if err != nil {
		return err
	}

	return ctx.Send(&influxql.Result{
		StatementID: ctx.StatementID,
		Series:      rows,
		Messages:    messages,
	})
}
コード例 #4
0
ファイル: statement_executor.go プロジェクト: li-ang/influxdb
func (e *StatementExecutor) executeSelectStatement(stmt *influxql.SelectStatement, ctx *influxql.ExecutionContext) error {
	itrs, stmt, err := e.createIterators(stmt, ctx)
	if err != nil {
		return err
	}

	// Generate a row emitter from the iterator set.
	em := influxql.NewEmitter(itrs, stmt.TimeAscending(), ctx.ChunkSize)
	em.Columns = stmt.ColumnNames()
	em.OmitTime = stmt.OmitTime
	defer em.Close()

	// Emit rows to the results channel.
	var writeN int64
	var emitted bool

	var pointsWriter *BufferedPointsWriter
	if stmt.Target != nil {
		pointsWriter = NewBufferedPointsWriter(e.PointsWriter, stmt.Target.Measurement.Database, stmt.Target.Measurement.RetentionPolicy, 10000)
	}

	for {
		row, partial, err := em.Emit()
		if err != nil {
			return err
		} else if row == nil {
			// Check if the query was interrupted while emitting.
			select {
			case <-ctx.InterruptCh:
				return influxql.ErrQueryInterrupted
			default:
			}
			break
		}

		// Write points back into system for INTO statements.
		if stmt.Target != nil {
			if err := e.writeInto(pointsWriter, stmt, row); err != nil {
				return err
			}
			writeN += int64(len(row.Values))
			continue
		}

		result := &influxql.Result{
			StatementID: ctx.StatementID,
			Series:      []*models.Row{row},
			Partial:     partial,
		}

		// Send results or exit if closing.
		if err := ctx.Send(result); err != nil {
			return err
		}

		emitted = true
	}

	// Flush remaining points and emit write count if an INTO statement.
	if stmt.Target != nil {
		if err := pointsWriter.Flush(); err != nil {
			return err
		}

		var messages []*influxql.Message
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}

		return ctx.Send(&influxql.Result{
			StatementID: ctx.StatementID,
			Messages:    messages,
			Series: []*models.Row{{
				Name:    "result",
				Columns: []string{"time", "written"},
				Values:  [][]interface{}{{time.Unix(0, 0).UTC(), writeN}},
			}},
		})
	}

	// Always emit at least one result.
	if !emitted {
		return ctx.Send(&influxql.Result{
			StatementID: ctx.StatementID,
			Series:      make([]*models.Row, 0),
		})
	}

	return nil
}