Golang Series.Points方法代码示例

func createResponse(nextPointMap map[string]*NextPoint, series *protocol.Series, id *uint32) *protocol.Response {
	pointCount := len(series.Points)
	if pointCount < 1 {
		if nextPoint := nextPointMap[*series.Name]; nextPoint != nil {
			series.Points = append(series.Points, nextPoint.point)
			series.Fields = nextPoint.fields
		}
		response := &protocol.Response{Type: &queryResponse, Series: series, RequestId: id}

		return response
	}
	oldNextPoint := nextPointMap[*series.Name]
	nextPoint := series.Points[pointCount-1]
	series.Points[pointCount-1] = nil
	if oldNextPoint != nil {
		copy(series.Points[1:], series.Points[0:])
		series.Points[0] = oldNextPoint.point
	} else {
		series.Points = series.Points[:len(series.Points)-1]
	}

	response := &protocol.Response{Series: series, Type: &queryResponse, RequestId: id}
	if nextPoint != nil {
		response.NextPointTime = nextPoint.Timestamp
		nextPointMap[*series.Name] = &NextPoint{series.Fields, nextPoint}
	}
	return response
}

func Filter(query *parser.SelectQuery, series *protocol.Series) (*protocol.Series, error) {
	if query.GetWhereCondition() == nil {
		return series, nil
	}

	columns := map[string]struct{}{}
	if query.GetFromClause().Type == parser.FromClauseInnerJoin {
	outer:
		for t, cs := range query.GetResultColumns() {
			for _, c := range cs {
				// if this is a wildcard select, then drop all columns and
				// just use '*'
				if c == "*" {
					columns = make(map[string]struct{}, 1)
					columns[c] = struct{}{}
					break outer
				}
				columns[t.Name+"."+c] = struct{}{}
			}
		}
	} else {
		for _, cs := range query.GetResultColumns() {
			for _, c := range cs {
				columns[c] = struct{}{}
			}
		}
	}

	points := series.Points
	series.Points = nil
	for _, point := range points {
		ok, err := matches(query.GetWhereCondition(), series.Fields, point)

		if err != nil {
			return nil, err
		}

		if ok {
			fmt.Printf("columns: %v, fields: %v\n", columns, series.Fields)

			filterColumns(columns, series.Fields, point)
			series.Points = append(series.Points, point)
		}
	}

	if _, ok := columns["*"]; !ok {
		newFields := []string{}
		for _, f := range series.Fields {
			if _, ok := columns[f]; !ok {
				continue
			}

			newFields = append(newFields, f)
		}
		series.Fields = newFields
	}
	return series, nil
}

func (self *CoordinatorImpl) CommitSeriesData(db string, series *protocol.Series) error {
	lastPointIndex := 0
	now := common.CurrentTime()
	var shardToWrite cluster.Shard
	for _, point := range series.Points {
		if point.Timestamp == nil {
			point.Timestamp = &now
		}
	}

	lastTime := int64(math.MinInt64)
	if len(series.Points) > 0 && *series.Points[0].Timestamp == lastTime {
		// just a hack to make sure lastTime will never equal the first
		// point's timestamp
		lastTime = 0
	}

	// sort the points by timestamp
	series.SortPointsTimeDescending()

	for i, point := range series.Points {
		if *point.Timestamp != lastTime {
			shard, err := self.clusterConfiguration.GetShardToWriteToBySeriesAndTime(db, *series.Name, *point.Timestamp)
			if err != nil {
				return err
			}
			if shardToWrite == nil {
				shardToWrite = shard
			} else if shardToWrite.Id() != shard.Id() {
				newIndex := i
				newSeries := &protocol.Series{Name: series.Name, Fields: series.Fields, Points: series.Points[lastPointIndex:newIndex]}
				if err := self.write(db, newSeries, shardToWrite); err != nil {
					return err
				}
				lastPointIndex = newIndex
				shardToWrite = shard
			}
			lastTime = *point.Timestamp
		}
	}

	series.Points = series.Points[lastPointIndex:]

	if len(series.Points) > 0 {
		if shardToWrite == nil {
			shardToWrite, _ = self.clusterConfiguration.GetShardToWriteToBySeriesAndTime(db, *series.Name, *series.Points[0].Timestamp)
		}

		err := self.write(db, series, shardToWrite)

		if err != nil {
			log.Error("COORD error writing: ", err)
			return err
		}

		return err
	}

	return nil
}

func (self *Limiter) calculateLimitAndSlicePoints(series *protocol.Series) {
	if self.shouldLimit {
		// if the limit is 0, stop returning any points
		limit := self.limitForSeries(*series.Name)
		defer func() { self.limits[*series.Name] = limit }()
		if limit == 0 {
			series.Points = nil
			return
		}
		limit -= len(series.Points)
		if limit <= 0 {
			sliceTo := len(series.Points) + limit
			series.Points = series.Points[0:sliceTo]
			limit = 0
		}
	}
}

// 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 Filter(query *parser.SelectQuery, series *protocol.Series) (*protocol.Series, error) {
	if query.GetWhereCondition() == nil {
		return series, nil
	}

	columns := map[string]bool{}
	getColumns(query.GetColumnNames(), columns)
	getColumns(query.GetGroupByClause().Elems, columns)

	points := series.Points
	series.Points = nil
	for _, point := range points {
		ok, err := matches(query.GetWhereCondition(), series.Fields, point)

		if err != nil {
			return nil, err
		}

		if ok {
			filterColumns(columns, series.Fields, point)
			series.Points = append(series.Points, point)
		}
	}

	if !columns["*"] {
		newFields := []string{}
		for _, f := range series.Fields {
			if _, ok := columns[f]; !ok {
				continue
			}

			newFields = append(newFields, f)
		}
		series.Fields = newFields
	}
	return series, nil
}

func (self *CoordinatorImpl) normalizePointAndAppend(fieldNames map[string]int, result *protocol.Series, fields []string, point *protocol.Point) {
	oldValues := point.Values
	point.Values = make([]*protocol.FieldValue, len(fieldNames), len(fieldNames))
	for index, field := range fields {
		indexForField, ok := fieldNames[field]

		// drop this point on the floor if the unexpected happens
		if !ok {
			log.Error("Couldn't lookup field: ", field, fields, fieldNames)
			return
		}
		point.Values[indexForField] = oldValues[index]
	}
	result.Points = append(result.Points, point)
}

func (self *CoordinatorImpl) CommitSeriesData(db string, series *protocol.Series) error {
	lastTime := int64(0)
	lastPointIndex := 0
	now := common.CurrentTime()
	var shardToWrite cluster.Shard
	for i, point := range series.Points {
		if point.Timestamp == nil {
			point.Timestamp = &now
		}
		if *point.Timestamp != lastTime {
			shard, err := self.clusterConfiguration.GetShardToWriteToBySeriesAndTime(db, *series.Name, *point.Timestamp)
			if err != nil {
				return err
			}
			if shardToWrite == nil {
				shardToWrite = shard
			} else if shardToWrite.Id() != shard.Id() {
				newIndex := i + 1
				newSeries := &protocol.Series{Name: series.Name, Fields: series.Fields, Points: series.Points[lastPointIndex:newIndex]}
				self.write(db, newSeries, shardToWrite)
				lastPointIndex = newIndex
				shardToWrite = shard
			}
			lastTime = *point.Timestamp
		}
	}

	series.Points = series.Points[lastPointIndex:]

	if len(series.Points) > 0 {
		if shardToWrite == nil {
			shardToWrite, _ = self.clusterConfiguration.GetShardToWriteToBySeriesAndTime(db, *series.Name, *series.Points[0].Timestamp)
		}

		err := self.write(db, series, shardToWrite)

		if err != nil {
			log.Error("COORD error writing: ", err)
		}

		return err
	}

	return nil
}

// TODO: refactor this for clarity. This got super ugly...
// Function yields all results that are safe to do so ensuring order. Returns all results that must wait for more from the servers.
func (self *CoordinatorImpl) yieldResultsForSeries(isAscending bool, leftover *protocol.Series, responses []*protocol.Response, yield func(*protocol.Series) error) *protocol.Series {
	// results can come from different servers. Some of which won't know about fields that other servers may know about.
	// We need to normalize all this so that all fields are represented and the other field values are null.
	// Give each unique field name an index. We'll use this map later to construct the results and make sure that
	// the response objects have their fields in the result.
	fieldIndexes := make(map[string]int)
	for _, response := range responses {
		for _, name := range response.Series.Fields {
			if _, hasField := fieldIndexes[name]; !hasField {
				fieldIndexes[name] = len(fieldIndexes)
			}
		}
	}
	fields := make([]string, len(fieldIndexes), len(fieldIndexes))
	for name, index := range fieldIndexes {
		fields[index] = name
	}
	fieldCount := len(fields)

	result := &protocol.Series{Name: responses[0].Series.Name, Fields: fields, Points: make([]*protocol.Point, 0)}
	if leftover == nil {
		leftover = &protocol.Series{Name: responses[0].Series.Name, Fields: fields, Points: make([]*protocol.Point, 0)}
	}

	barrierTime := BARRIER_TIME_MIN
	if isAscending {
		barrierTime = BARRIER_TIME_MAX
	}
	var shouldYieldComparator func(rawTime *int64) bool
	if isAscending {
		shouldYieldComparator = func(rawTime *int64) bool {
			if rawTime != nil && *rawTime < barrierTime {
				return true
			} else {
				return false
			}
		}
	} else {
		shouldYieldComparator = func(rawTime *int64) bool {
			if rawTime != nil && *rawTime > barrierTime {
				return true
			} else {
				return false
			}
		}
	}
	// find the barrier time
	for _, response := range responses {
		if shouldYieldComparator(response.NextPointTime) {
			barrierTime = *response.NextPointTime
		}
	}
	// yield the points from leftover that are safe
	for _, point := range leftover.Points {
		if shouldYieldComparator(point.Timestamp) {
			result.Points = append(result.Points, point)
		} else {
			break
		}
	}
	// if they all got added, clear out the leftover
	if len(leftover.Points) == len(result.Points) {
		leftover.Points = make([]*protocol.Point, 0)
	}

	if barrierTime == BARRIER_TIME_MIN || barrierTime == BARRIER_TIME_MAX {
		// all the nextPointTimes were nil so we're safe to send everything
		for _, response := range responses {
			// if this is the case we know that all responses contained the same
			// fields. So just append the points
			if len(response.Series.Fields) == fieldCount {
				result.Points = append(result.Points, response.Series.Points...)
			} else {
				log.Debug("Responses from servers had different numbers of fields.")
				for _, p := range response.Series.Points {
					self.normalizePointAndAppend(fieldIndexes, result, response.Series.Fields, p)
				}
			}
		}
		if len(leftover.Fields) == fieldCount {
			result.Points = append(result.Points, leftover.Points...)
			leftover.Points = []*protocol.Point{}
		} else {
			log.Debug("Responses from servers had different numbers of fields.")
			for _, p := range leftover.Points {
				self.normalizePointAndAppend(fieldIndexes, result, leftover.Fields, p)
			}
		}
	} else {
		for _, response := range responses {
			if shouldYieldComparator(response.NextPointTime) {
				// all points safe to yield
				if fieldCount == len(response.Series.Fields) {
					result.Points = append(result.Points, response.Series.Points...)
				} else {
					log.Debug("Responses from servers had different numbers of fields.")
					for _, p := range response.Series.Points {
						self.normalizePointAndAppend(fieldIndexes, result, response.Series.Fields, p)
//.........这里部分代码省略.........