telegraf/plugins/outputs/datadog/datadog.go

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package datadog
import (
"bytes"
"encoding/json"
"fmt"
"log"
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"net/http"
"net/url"
"strings"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/plugins/outputs"
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)
type Datadog struct {
Apikey string
Timeout internal.Duration
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URL string `toml:"url"`
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client *http.Client
}
var sampleConfig = `
## Datadog API key
apikey = "my-secret-key" # required.
# The base endpoint URL can optionally be specified but it defaults to:
#url = "https://app.datadoghq.com/api/v1/series"
## Connection timeout.
# timeout = "5s"
`
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type TimeSeries struct {
Series []*Metric `json:"series"`
}
type Metric struct {
Metric string `json:"metric"`
Points [1]Point `json:"points"`
Host string `json:"host"`
Tags []string `json:"tags,omitempty"`
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}
type Point [2]float64
const datadog_api = "https://app.datadoghq.com/api/v1/series"
func (d *Datadog) Connect() error {
if d.Apikey == "" {
return fmt.Errorf("apikey is a required field for datadog output")
}
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d.client = &http.Client{
Transport: &http.Transport{
Proxy: http.ProxyFromEnvironment,
},
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Timeout: d.Timeout.Duration,
}
return nil
}
func (d *Datadog) Write(metrics []telegraf.Metric) error {
if len(metrics) == 0 {
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return nil
}
ts := TimeSeries{}
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tempSeries := []*Metric{}
metricCounter := 0
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for _, m := range metrics {
if dogMs, err := buildMetrics(m); err == nil {
metricTags := buildTags(m.TagList())
host, _ := m.GetTag("host")
for fieldName, dogM := range dogMs {
// name of the datadog measurement
var dname string
if fieldName == "value" {
// adding .value seems redundant here
dname = m.Name()
} else {
dname = m.Name() + "." + fieldName
}
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metric := &Metric{
Metric: dname,
Tags: metricTags,
Host: host,
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}
metric.Points[0] = dogM
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tempSeries = append(tempSeries, metric)
metricCounter++
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}
} else {
log.Printf("I! unable to build Metric for %s due to error '%v', skipping\n", m.Name(), err)
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}
}
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redactedApiKey := "****************"
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ts.Series = make([]*Metric, metricCounter)
copy(ts.Series, tempSeries[0:])
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tsBytes, err := json.Marshal(ts)
if err != nil {
return fmt.Errorf("unable to marshal TimeSeries, %s\n", err.Error())
}
req, err := http.NewRequest("POST", d.authenticatedUrl(), bytes.NewBuffer(tsBytes))
if err != nil {
return fmt.Errorf("unable to create http.Request, %s\n", strings.Replace(err.Error(), d.Apikey, redactedApiKey, -1))
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}
req.Header.Add("Content-Type", "application/json")
resp, err := d.client.Do(req)
if err != nil {
return fmt.Errorf("error POSTing metrics, %s\n", strings.Replace(err.Error(), d.Apikey, redactedApiKey, -1))
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}
defer resp.Body.Close()
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if resp.StatusCode < 200 || resp.StatusCode > 209 {
return fmt.Errorf("received bad status code, %d\n", resp.StatusCode)
}
return nil
}
func (d *Datadog) SampleConfig() string {
return sampleConfig
}
func (d *Datadog) Description() string {
return "Configuration for DataDog API to send metrics to."
}
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func (d *Datadog) authenticatedUrl() string {
q := url.Values{
"api_key": []string{d.Apikey},
}
return fmt.Sprintf("%s?%s", d.URL, q.Encode())
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}
func buildMetrics(m telegraf.Metric) (map[string]Point, error) {
ms := make(map[string]Point)
for _, field := range m.FieldList() {
if !verifyValue(field.Value) {
continue
}
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var p Point
if err := p.setValue(field.Value); err != nil {
return ms, fmt.Errorf("unable to extract value from Fields %v error %v", field.Key, err.Error())
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}
p[0] = float64(m.Time().Unix())
ms[field.Key] = p
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}
return ms, nil
}
func buildTags(tagList []*telegraf.Tag) []string {
tags := make([]string, len(tagList))
index := 0
for _, tag := range tagList {
tags[index] = fmt.Sprintf("%s:%s", tag.Key, tag.Value)
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index += 1
}
return tags
}
func verifyValue(v interface{}) bool {
switch v.(type) {
case string:
return false
}
return true
}
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func (p *Point) setValue(v interface{}) error {
switch d := v.(type) {
case int64:
p[1] = float64(d)
case uint64:
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p[1] = float64(d)
case float64:
p[1] = float64(d)
case bool:
p[1] = float64(0)
if d {
p[1] = float64(1)
}
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default:
return fmt.Errorf("undeterminable field type: %T", v)
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}
return nil
}
func (d *Datadog) Close() error {
return nil
}
func init() {
outputs.Add("datadog", func() telegraf.Output {
return &Datadog{
URL: datadog_api,
}
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})
}