Golang Series.GetName方法代码示例

// merges two time series making sure that the resulting series has
// the union of the two series columns and the values set
// properly. will panic if the two series don't have the same name
func MergeSeries(s1, s2 *protocol.Series) *protocol.Series {
	if s1.GetName() != s2.GetName() {
		panic("the two series don't have the same name")
	}

	// if the two series have the same columns and in the same order
	// append the points and return.
	if reflect.DeepEqual(s1.Fields, s2.Fields) {
		s1.Points = append(s1.Points, s2.Points...)
		return s1
	}

	columns := map[string]struct{}{}

	for _, cs := range [][]string{s1.Fields, s2.Fields} {
		for _, c := range cs {
			columns[c] = struct{}{}
		}
	}

	points := append(pointMaps(s1), pointMaps(s2)...)

	fieldsSlice := make([]string, 0, len(columns))
	for c := range columns {
		fieldsSlice = append(fieldsSlice, c)
	}

	resultPoints := make([]*protocol.Point, 0, len(points))
	for idx, point := range points {
		resultPoint := &protocol.Point{}
		for _, field := range fieldsSlice {
			value := point[field]
			if value == nil {
				value = &protocol.FieldValue{
					IsNull: &TRUE,
				}
			}
			resultPoint.Values = append(resultPoint.Values, value)
			if idx < len(s1.Points) {
				resultPoint.Timestamp = s1.Points[idx].Timestamp
				resultPoint.SequenceNumber = s1.Points[idx].SequenceNumber
			} else {
				resultPoint.Timestamp = s2.Points[idx-len(s1.Points)].Timestamp
				resultPoint.SequenceNumber = s2.Points[idx-len(s1.Points)].SequenceNumber
			}
		}
		resultPoints = append(resultPoints, resultPoint)
	}

	// otherwise, merge the columns
	result := &protocol.Series{
		Name:   s1.Name,
		Fields: fieldsSlice,
		Points: resultPoints,
	}

	return result
}

func (self *AllPointsWriter) yield(series *protocol.Series) error {
	oldSeries := self.memSeries[*series.Name]
	if oldSeries == nil {
		self.memSeries[*series.Name] = series
		return nil
	}

	self.memSeries[series.GetName()] = MergeSeries(self.memSeries[series.GetName()], series)
	return nil
}

func (je *JoinEngine) Yield(s *protocol.Series) (bool, error) {
	log4go.Fine("JoinEngine.Yield(): %s", s)
	idx := je.tableIdx[s.GetName()]
	state := &je.tablesState[idx]
	// If the state for this table didn't contain a point already,
	// increment the number of tables ready to emit a point by
	// incrementing `pts`
	if state.lastPoint == nil {
		je.pts++
	}
	state.lastPoint = s.Points[len(s.Points)-1]
	// update the fields for this table. the fields shouldn't change
	// after the first point, so we only need to set them once
	if state.lastFields == nil {
		for _, f := range s.Fields {
			state.lastFields = append(state.lastFields, s.GetName()+"."+f)
		}
	}

	log4go.Fine("JoinEngine: pts = %d", je.pts)
	// if the number of tables ready to emit a point isn't equal to the
	// total number of tables being joined, then return
	if je.pts != len(je.tablesState) {
		return true, nil
	}

	// we arbitrarily use the timestamp of the first table's point as
	// the timestamp of the resulting point. may be we should use the
	// smalles (or largest) timestamp.
	ts := je.tablesState[0].lastPoint.Timestamp
	newSeries := &protocol.Series{
		Name:   &je.name,
		Fields: je.fields(),
		Points: []*protocol.Point{
			{
				Timestamp: ts,
				Values:    je.values(),
			},
		},
	}

	// filter the point. the user may have a where clause with the join,
	// e.g. `select * from join(foo1, foo2) where foo1.val > 10`. we
	// can't evaluate the where clause until after join happens
	filteredSeries, err := Filter(je.query, newSeries)
	if err != nil {
		return false, err
	}

	if len(filteredSeries.Points) > 0 {
		return je.next.Yield(newSeries)
	}
	return true, nil
}

// We have three types of queries:
//   1. time() without fill
//   2. time() with fill
//   3. no time()
//
// For (1) we flush as soon as a new bucket start, the prefix tree
// keeps track of the other group by columns without the time
// bucket. We reset the trie once the series is yielded. For (2), we
// keep track of all group by columns with time being the last level
// in the prefix tree. At the end of the query we step through [start
// time, end time] in self.duration steps and get the state from the
// prefix tree, using default values for groups without state in the
// prefix tree. For the last case we keep the groups in the prefix
// tree and on close() we loop through the groups and flush their
// values with a timestamp equal to now()
func (self *AggregatorEngine) aggregateValuesForSeries(series *protocol.Series) (bool, error) {
	for _, aggregator := range self.aggregators {
		if err := aggregator.InitializeFieldsMetadata(series); err != nil {
			return false, err
		}
	}

	seriesState := self.getSeriesState(series.GetName())
	currentRange := seriesState.pointsRange

	includeTimestampInGroup := self.duration != nil && self.isFillQuery
	var group []*protocol.FieldValue
	if !includeTimestampInGroup {
		group = make([]*protocol.FieldValue, len(self.elems))
	} else {
		group = make([]*protocol.FieldValue, len(self.elems)+1)
	}

	for _, point := range series.Points {
		currentRange.UpdateRange(point)

		// this is a groupby with time() and no fill, flush as soon as we
		// start a new bucket
		if self.duration != nil && !self.isFillQuery {
			timestamp := self.getTimestampFromPoint(point)
			// this is the timestamp aggregator
			if seriesState.started && seriesState.lastTimestamp != timestamp {
				self.runAggregatesForTable(series.GetName())
			}
			seriesState.lastTimestamp = timestamp
			seriesState.started = true
		}

		// get the group this point belongs to
		for idx, elem := range self.elems {
			// TODO: create an index from fieldname to index

			// TODO: We shouldn't rely on GetValue() to do arithmetic
			// operations. Instead we should cascade the arithmetic engine
			// with the aggregator engine and possibly add another
			// arithmetic engine to be able to do arithmetics on the
			// resulting aggregated data.
			value, err := GetValue(elem, series.Fields, point)
			if err != nil {
				return false, err
			}
			group[idx] = value
		}

		// if this is a fill() query, add the timestamp at the end
		if includeTimestampInGroup {
			timestamp := self.getTimestampFromPoint(point)
			group[len(self.elems)] = &protocol.FieldValue{Int64Value: protocol.Int64(timestamp)}
		}

		// update the state of the given group
		node := seriesState.trie.GetNode(group)
		var err error
		log4go.Debug("Aggregating for group %v", group)
		for idx, aggregator := range self.aggregators {
			log4go.Debug("Aggregating value for %T for group %v and state %v", aggregator, group, node.states[idx])
			node.states[idx], err = aggregator.AggregatePoint(node.states[idx], point)
			if err != nil {
				return false, err
			}
		}
	}

	return true, nil
}