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