122 lines
2.8 KiB
Go
122 lines
2.8 KiB
Go
package opentsdb
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/json"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"net/http"
|
|
"net/url"
|
|
"regexp"
|
|
"time"
|
|
|
|
clientmodel "github.com/prometheus/client_golang/model"
|
|
|
|
"github.com/prometheus/prometheus/utility"
|
|
)
|
|
|
|
const (
|
|
putEndpoint = "/api/put"
|
|
contentTypeJSON = "application/json"
|
|
)
|
|
|
|
var (
|
|
illegalCharsRE = regexp.MustCompile(`[^a-zA-Z0-9_\-./]`)
|
|
)
|
|
|
|
// Client allows sending batches of Prometheus samples to OpenTSDB.
|
|
type Client struct {
|
|
url string
|
|
httpClient *http.Client
|
|
}
|
|
|
|
// NewClient creates a new Client.
|
|
func NewClient(url string, timeout time.Duration) *Client {
|
|
return &Client{
|
|
url: url,
|
|
httpClient: utility.NewDeadlineClient(timeout),
|
|
}
|
|
}
|
|
|
|
// StoreSamplesRequest is used for building a JSON request for storing samples
|
|
// via the OpenTSDB.
|
|
type StoreSamplesRequest struct {
|
|
Metric string `json:"metric"`
|
|
Timestamp int64 `json:"timestamp"`
|
|
Value clientmodel.SampleValue `json:"value"`
|
|
Tags map[string]string `json:"tags"`
|
|
}
|
|
|
|
// escapeTagValue escapes Prometheus label values to valid tag values for
|
|
// OpenTSDB.
|
|
func escapeTagValue(l clientmodel.LabelValue) string {
|
|
return illegalCharsRE.ReplaceAllString(string(l), "_")
|
|
}
|
|
|
|
// tagsFromMetric translates Prometheus metric into OpenTSDB tags.
|
|
func tagsFromMetric(m clientmodel.Metric) map[string]string {
|
|
tags := make(map[string]string, len(m)-1)
|
|
for l, v := range m {
|
|
if l == clientmodel.MetricNameLabel {
|
|
continue
|
|
}
|
|
tags[string(l)] = escapeTagValue(v)
|
|
}
|
|
return tags
|
|
}
|
|
|
|
// Store sends a batch of samples to OpenTSDB via its HTTP API.
|
|
func (c *Client) Store(samples clientmodel.Samples) error {
|
|
reqs := make([]StoreSamplesRequest, 0, len(samples))
|
|
for _, s := range samples {
|
|
metric := escapeTagValue(s.Metric[clientmodel.MetricNameLabel])
|
|
reqs = append(reqs, StoreSamplesRequest{
|
|
Metric: metric,
|
|
Timestamp: s.Timestamp.Unix(),
|
|
Value: s.Value,
|
|
Tags: tagsFromMetric(s.Metric),
|
|
})
|
|
}
|
|
|
|
u, err := url.Parse(c.url)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
u.Path = putEndpoint
|
|
|
|
buf, err := json.Marshal(reqs)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
resp, err := c.httpClient.Post(
|
|
u.String(),
|
|
contentTypeJSON,
|
|
bytes.NewBuffer(buf),
|
|
)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer resp.Body.Close()
|
|
|
|
// API returns status code 204 for successful writes.
|
|
// http://opentsdb.net/docs/build/html/api_http/put.html
|
|
if resp.StatusCode == http.StatusNoContent {
|
|
return nil
|
|
}
|
|
|
|
// API returns status code 400 on error, encoding error details in the
|
|
// response content in JSON.
|
|
buf, err = ioutil.ReadAll(resp.Body)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
var r map[string]int
|
|
if err := json.Unmarshal(buf, &r); err != nil {
|
|
return err
|
|
}
|
|
return fmt.Errorf("failed to write %d samples to OpenTSDB, %d succeeded", r["failed"], r["success"])
|
|
}
|