77 lines
1.7 KiB
Go
77 lines
1.7 KiB
Go
package geo
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import (
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"fmt"
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"github.com/golang/geo/s2"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/processors"
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)
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type Geo struct {
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LatField string `toml:"lat_field"`
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LonField string `toml:"lon_field"`
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TagKey string `toml:"tag_key"`
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CellLevel int `toml:"cell_level"`
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}
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var SampleConfig = `
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## The name of the lat and lon fields containing WGS-84 latitude and longitude in decimal degrees
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lat_field = "lat"
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lon_field = "lon"
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## New tag to create
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tag_key = "s2_cell_id"
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## Cell level (see https://s2geometry.io/resources/s2cell_statistics.html)
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cell_level = 9
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`
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func (g *Geo) SampleConfig() string {
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return SampleConfig
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}
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func (g *Geo) Description() string {
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return "Reads latitude and longitude fields and adds tag with with S2 cell ID token of specified level."
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}
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func (g *Geo) Init() error {
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if g.CellLevel < 0 || g.CellLevel > 30 {
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return fmt.Errorf("invalid cell level %d", g.CellLevel)
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}
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return nil
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}
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func (g *Geo) Apply(in ...telegraf.Metric) []telegraf.Metric {
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for _, point := range in {
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var latOk, lonOk bool
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var lat, lon float64
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for _, field := range point.FieldList() {
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switch field.Key {
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case g.LatField:
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lat, latOk = field.Value.(float64)
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case g.LonField:
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lon, lonOk = field.Value.(float64)
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}
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}
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if latOk && lonOk {
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cellID := s2.CellIDFromLatLng(s2.LatLngFromDegrees(lat, lon))
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if cellID.IsValid() {
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value := cellID.Parent(g.CellLevel).ToToken()
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point.AddTag(g.TagKey, value)
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}
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}
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}
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return in
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}
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func init() {
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processors.Add("s2geo", func() telegraf.Processor {
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return &Geo{
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LatField: "lat",
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LonField: "lon",
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TagKey: "s2_cell_id",
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CellLevel: 9,
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}
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})
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}
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