telegraf/plugins/outputs/amon/amon.go

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package amon
import (
"bytes"
"encoding/json"
"fmt"
"log"
"net/http"
"strings"
"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/plugins/outputs"
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)
type Amon struct {
ServerKey string
AmonInstance string
Timeout internal.Duration
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client *http.Client
}
var sampleConfig = `
## Amon Server Key
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server_key = "my-server-key" # required.
## Amon Instance URL
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amon_instance = "https://youramoninstance" # required
## Connection timeout.
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# timeout = "5s"
`
type TimeSeries struct {
Series []*Metric `json:"series"`
}
type Metric struct {
Metric string `json:"metric"`
Points [1]Point `json:"metrics"`
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}
type Point [2]float64
func (a *Amon) Connect() error {
if a.ServerKey == "" || a.AmonInstance == "" {
return fmt.Errorf("serverkey and amon_instance are required fields for amon output")
}
a.client = &http.Client{
Transport: &http.Transport{
Proxy: http.ProxyFromEnvironment,
},
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Timeout: a.Timeout.Duration,
}
return nil
}
func (a *Amon) 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 {
mname := strings.Replace(m.Name(), "_", ".", -1)
if amonPts, err := buildMetrics(m); err == nil {
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for fieldName, amonPt := range amonPts {
metric := &Metric{
Metric: mname + "_" + strings.Replace(fieldName, "_", ".", -1),
}
metric.Points[0] = amonPt
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tempSeries = append(tempSeries, metric)
metricCounter++
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}
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} else {
log.Printf("I! unable to build Metric for %s, skipping\n", m.Name())
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}
}
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ts.Series = make([]*Metric, metricCounter)
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copy(ts.Series, tempSeries[0:])
tsBytes, err := json.Marshal(ts)
if err != nil {
return fmt.Errorf("unable to marshal TimeSeries, %s\n", err.Error())
}
req, err := http.NewRequest("POST", a.authenticatedUrl(), bytes.NewBuffer(tsBytes))
if err != nil {
return fmt.Errorf("unable to create http.Request, %s\n", err.Error())
}
req.Header.Add("Content-Type", "application/json")
resp, err := a.client.Do(req)
if err != nil {
return fmt.Errorf("error POSTing metrics, %s\n", err.Error())
}
defer resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode > 209 {
return fmt.Errorf("received bad status code, %d\n", resp.StatusCode)
}
return nil
}
func (a *Amon) SampleConfig() string {
return sampleConfig
}
func (a *Amon) Description() string {
return "Configuration for Amon Server to send metrics to."
}
func (a *Amon) authenticatedUrl() string {
return fmt.Sprintf("%s/api/system/%s", a.AmonInstance, a.ServerKey)
}
func buildMetrics(m telegraf.Metric) (map[string]Point, error) {
ms := make(map[string]Point)
for k, v := range m.Fields() {
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var p Point
if err := p.setValue(v); err != nil {
return ms, fmt.Errorf("unable to extract value from Fields, %s", err.Error())
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}
p[0] = float64(m.Time().Unix())
ms[k] = p
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}
return ms, nil
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}
func (p *Point) setValue(v interface{}) error {
switch d := v.(type) {
case int:
p[1] = float64(int(d))
case int32:
p[1] = float64(int32(d))
case int64:
p[1] = float64(int64(d))
case float32:
p[1] = float64(d)
case float64:
p[1] = float64(d)
default:
return fmt.Errorf("undeterminable type")
}
return nil
}
func (a *Amon) Close() error {
return nil
}
func init() {
outputs.Add("amon", func() telegraf.Output {
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return &Amon{}
})
}