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librato.go
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librato.go
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package librato
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"regexp"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/plugins/outputs"
"github.com/influxdata/telegraf/plugins/serializers/graphite"
)
// Librato structure for configuration and client
type Librato struct {
APIUser string `toml:"api_user"`
APIToken string `toml:"api_token"`
Debug bool
SourceTag string // Deprecated, keeping for backward-compatibility
Timeout internal.Duration
Template string
APIUrl string
client *http.Client
}
// https://www.librato.com/docs/kb/faq/best_practices/naming_convention_metrics_sources.html#naming-limitations-for-sources-and-metrics
var reUnacceptedChar = regexp.MustCompile("[^.a-zA-Z0-9_-]")
var sampleConfig = `
## Librator API Docs
## http://dev.librato.com/v1/metrics-authentication
## Librato API user
api_user = "telegraf@influxdb.com" # required.
## Librato API token
api_token = "my-secret-token" # required.
## Debug
# debug = false
## Connection timeout.
# timeout = "5s"
## Output source Template (same as graphite buckets)
## see https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md#graphite
## This template is used in librato's source (not metric's name)
template = "host"
`
// LMetrics is the default struct for Librato's API fromat
type LMetrics struct {
Gauges []*Gauge `json:"gauges"`
}
// Gauge is the gauge format for Librato's API fromat
type Gauge struct {
Name string `json:"name"`
Value float64 `json:"value"`
Source string `json:"source"`
MeasureTime int64 `json:"measure_time"`
}
const libratoAPI = "https://metrics-api.librato.com/v1/metrics"
// NewLibrato is the main constructor for librato output plugins
func NewLibrato(apiURL string) *Librato {
return &Librato{
APIUrl: apiURL,
Template: "host",
}
}
// Connect is the default output plugin connection function who make sure it
// can connect to the endpoint
func (l *Librato) Connect() error {
if l.APIUser == "" || l.APIToken == "" {
return fmt.Errorf(
"api_user and api_token are required fields for librato output")
}
l.client = &http.Client{
Transport: &http.Transport{
Proxy: http.ProxyFromEnvironment,
},
Timeout: l.Timeout.Duration,
}
return nil
}
func (l *Librato) Write(metrics []telegraf.Metric) error {
if len(metrics) == 0 {
return nil
}
if l.Template == "" {
l.Template = "host"
}
if l.SourceTag != "" {
l.Template = l.SourceTag
}
tempGauges := []*Gauge{}
for _, m := range metrics {
if gauges, err := l.buildGauges(m); err == nil {
for _, gauge := range gauges {
tempGauges = append(tempGauges, gauge)
log.Printf("D! Got a gauge: %v\n", gauge)
}
} else {
log.Printf("I! unable to build Gauge for %s, skipping\n", m.Name())
log.Printf("D! Couldn't build gauge: %v\n", err)
}
}
metricCounter := len(tempGauges)
// make sur we send a batch of maximum 300
sizeBatch := 300
for start := 0; start < metricCounter; start += sizeBatch {
lmetrics := LMetrics{}
end := start + sizeBatch
if end > metricCounter {
end = metricCounter
sizeBatch = end - start
}
lmetrics.Gauges = make([]*Gauge, sizeBatch)
copy(lmetrics.Gauges, tempGauges[start:end])
metricsBytes, err := json.Marshal(lmetrics)
if err != nil {
return fmt.Errorf("unable to marshal Metrics, %s\n", err.Error())
}
log.Printf("D! Librato request: %v\n", string(metricsBytes))
req, err := http.NewRequest(
"POST",
l.APIUrl,
bytes.NewBuffer(metricsBytes))
if err != nil {
return fmt.Errorf(
"unable to create http.Request, %s\n",
err.Error())
}
req.Header.Add("Content-Type", "application/json")
req.SetBasicAuth(l.APIUser, l.APIToken)
resp, err := l.client.Do(req)
if err != nil {
log.Printf("D! Error POSTing metrics: %v\n", err.Error())
return fmt.Errorf("error POSTing metrics, %s\n", err.Error())
}
defer resp.Body.Close()
if resp.StatusCode != 200 || l.Debug {
htmlData, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Printf("D! Couldn't get response! (%v)\n", err)
}
if resp.StatusCode != 200 {
return fmt.Errorf(
"received bad status code, %d\n %s",
resp.StatusCode,
string(htmlData))
}
log.Printf("D! Librato response: %v\n", string(htmlData))
}
}
return nil
}
// SampleConfig is function who return the default configuration for this
// output
func (l *Librato) SampleConfig() string {
return sampleConfig
}
// Description is function who return the Description of this output
func (l *Librato) Description() string {
return "Configuration for Librato API to send metrics to."
}
func (l *Librato) buildGauges(m telegraf.Metric) ([]*Gauge, error) {
gauges := []*Gauge{}
if m.Time().Unix() == 0 {
return gauges, fmt.Errorf(
"Measure time must not be zero\n <%s> \n",
m.String())
}
metricSource := graphite.InsertField(
graphite.SerializeBucketName("", m.Tags(), l.Template, ""),
"value")
if metricSource == "" {
return gauges,
fmt.Errorf("undeterminable Source type from Field, %s\n",
l.Template)
}
for fieldName, value := range m.Fields() {
metricName := m.Name()
if fieldName != "value" {
metricName = fmt.Sprintf("%s.%s", m.Name(), fieldName)
}
gauge := &Gauge{
Source: reUnacceptedChar.ReplaceAllString(metricSource, "-"),
Name: reUnacceptedChar.ReplaceAllString(metricName, "-"),
MeasureTime: m.Time().Unix(),
}
if !verifyValue(value) {
continue
}
if err := gauge.setValue(value); err != nil {
return gauges, fmt.Errorf(
"unable to extract value from Fields, %s\n",
err.Error())
}
gauges = append(gauges, gauge)
}
log.Printf("D! Built gauges: %v\n", gauges)
return gauges, nil
}
func verifyValue(v interface{}) bool {
switch v.(type) {
case string:
return false
}
return true
}
func (g *Gauge) setValue(v interface{}) error {
switch d := v.(type) {
case int:
g.Value = float64(int(d))
case int32:
g.Value = float64(int32(d))
case int64:
g.Value = float64(int64(d))
case float32:
g.Value = float64(d)
case float64:
g.Value = float64(d)
default:
return fmt.Errorf("undeterminable type %+v", d)
}
return nil
}
//Close is used to close the connection to librato Output
func (l *Librato) Close() error {
return nil
}
func init() {
outputs.Add("librato", func() telegraf.Output {
return NewLibrato(libratoAPI)
})
}