mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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118 lines
3.0 KiB
Go
118 lines
3.0 KiB
Go
package datadog
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import (
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"encoding/json"
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"fmt"
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"strings"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
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)
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// SplitTag splits DataDog tag into tag name and value.
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//
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// See https://docs.datadoghq.com/getting_started/tagging/#define-tags
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func SplitTag(tag string) (string, string) {
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n := strings.IndexByte(tag, ':')
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if n < 0 {
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// No tag value.
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return tag, "no_label_value"
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}
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return tag[:n], tag[n+1:]
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}
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// Request represents DataDog POST request to /api/v1/series
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//
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// See https://docs.datadoghq.com/api/latest/metrics/#submit-metrics
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type Request struct {
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Series []Series `json:"series"`
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}
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func (req *Request) reset() {
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// recursively reset all the fields in req in order to avoid field value
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// re-use in json.Unmarshal() when the corresponding field is missing
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// in the unmarshaled JSON.
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// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3432
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series := req.Series
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for i := range series {
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series[i].reset()
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}
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req.Series = series[:0]
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}
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// Unmarshal unmarshals DataDog /api/v1/series request body from b to req.
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//
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// See https://docs.datadoghq.com/api/latest/metrics/#submit-metrics
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//
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// b shouldn't be modified when req is in use.
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func (req *Request) Unmarshal(b []byte) error {
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req.reset()
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if err := json.Unmarshal(b, req); err != nil {
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return fmt.Errorf("cannot unmarshal %q: %w", b, err)
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}
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// Set missing timestamps to the current time.
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currentTimestamp := float64(fasttime.UnixTimestamp())
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series := req.Series
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for i := range series {
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points := series[i].Points
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for j := range points {
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if points[j][0] <= 0 {
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points[j][0] = currentTimestamp
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}
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}
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}
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return nil
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}
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// Series represents a series item from DataDog POST request to /api/v1/series
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//
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// See https://docs.datadoghq.com/api/latest/metrics/#submit-metrics
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type Series struct {
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Metric string `json:"metric"`
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Host string `json:"host"`
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// The device field does not appear in the datadog docs, but datadog-agent does use it.
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// Datadog agent (v7 at least), removes the tag "device" and adds it as its own field. Why? That I don't know!
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// https://github.com/DataDog/datadog-agent/blob/0ada7a97fed6727838a6f4d9c87123d2aafde735/pkg/metrics/series.go#L84-L105
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Device string `json:"device"`
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// Do not decode Interval, since it isn't used by VictoriaMetrics
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// Interval int64 `json:"interval"`
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Points []Point `json:"points"`
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Tags []string `json:"tags"`
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// Do not decode Type, since it isn't used by VictoriaMetrics
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// Type string `json:"type"`
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}
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func (s *Series) reset() {
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s.Metric = ""
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s.Host = ""
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s.Device = ""
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points := s.Points
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for i := range points {
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points[i] = Point{}
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}
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s.Points = points[:0]
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tags := s.Tags
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for i := range tags {
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tags[i] = ""
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}
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s.Tags = tags[:0]
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}
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// Point represents a point from DataDog POST request to /api/v1/series
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type Point [2]float64
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// Timestamp returns timestamp in milliseconds from the given pt.
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func (pt *Point) Timestamp() int64 {
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return int64(pt[0] * 1000)
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}
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// Value returns value from the given pt.
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func (pt *Point) Value() float64 {
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return pt[1]
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}
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