func (self *QueryEngine) YieldSeries(seriesIncoming *protocol.Series) (shouldContinue bool) {
if self.explain {
self.pointsRead += int64(len(seriesIncoming.Points))
}
seriesName := seriesIncoming.GetName()
self.seriesToPoints[seriesName] = &protocol.Series{Name: &seriesName, Fields: seriesIncoming.Fields}
return self.yieldSeriesData(seriesIncoming) && !self.limiter.hitLimit(seriesIncoming.GetName())
}
// 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 (self *PassthroughEngine) YieldSeries(seriesIncoming *protocol.Series) bool {
log.Debug("PassthroughEngine YieldSeries %d", len(seriesIncoming.Points))
if *seriesIncoming.Name == "explain query" {
self.responseType = &explainQueryResponse
log.Debug("Response Changed!")
} else {
self.responseType = &queryResponse
}
self.limiter.calculateLimitAndSlicePoints(seriesIncoming)
if len(seriesIncoming.Points) == 0 {
log.Error("Not sent == 0")
return false
}
if self.response == nil {
self.response = &protocol.Response{
Type: self.responseType,
Series: seriesIncoming,
}
} else if self.response.Series.GetName() != seriesIncoming.GetName() {
self.responseChan <- self.response
self.response = &protocol.Response{
Type: self.responseType,
Series: seriesIncoming,
}
} else if len(self.response.Series.Points) > self.maxPointsInResponse {
self.responseChan <- self.response
self.response = &protocol.Response{
Type: self.responseType,
Series: seriesIncoming,
}
} else {
self.response.Series.Points = append(self.response.Series.Points, seriesIncoming.Points...)
}
return !self.limiter.hitLimit(seriesIncoming.GetName())
//return true
}
// 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 *QueryEngine) aggregateValuesForSeries(series *protocol.Series) error {
for _, aggregator := range self.aggregators {
if err := aggregator.InitializeFieldsMetadata(series); err != nil {
return err
}
}
seriesState := self.getSeriesState(series.GetName())
currentRange := seriesState.pointsRange
includeTimestampInGroup := self.duration != nil && self.fillWithZero
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.fillWithZero {
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
value, err := GetValue(elem, series.Fields, point)
if err != nil {
return 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
for idx, aggregator := range self.aggregators {
node.states[idx], err = aggregator.AggregatePoint(node.states[idx], point)
if err != nil {
return err
}
}
}
return nil
}