137 lines
3.3 KiB
Go
137 lines
3.3 KiB
Go
// Copyright 2013 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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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"math"
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"net/http"
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"net/url"
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"time"
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"github.com/prometheus/common/log"
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"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/util/httputil"
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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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// 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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// NewClient creates 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: httputil.NewDeadlineClient(timeout, nil),
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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 TagValue `json:"metric"`
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Timestamp int64 `json:"timestamp"`
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Value float64 `json:"value"`
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Tags map[string]TagValue `json:"tags"`
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}
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// tagsFromMetric translates Prometheus metric into OpenTSDB tags.
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func tagsFromMetric(m model.Metric) map[string]TagValue {
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tags := make(map[string]TagValue, len(m)-1)
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for l, v := range m {
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if l == model.MetricNameLabel {
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continue
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}
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tags[string(l)] = TagValue(v)
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}
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return tags
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}
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// Store sends a batch of samples to OpenTSDB via its HTTP API.
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func (c *Client) Store(samples model.Samples) error {
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reqs := make([]StoreSamplesRequest, 0, len(samples))
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for _, s := range samples {
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v := float64(s.Value)
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if math.IsNaN(v) || math.IsInf(v, 0) {
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log.Warnf("cannot send value %f to OpenTSDB, skipping sample %#v", v, s)
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continue
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}
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metric := TagValue(s.Metric[model.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: v,
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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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// Name identifies the client as an OpenTSDB client.
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func (c Client) Name() string {
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return "opentsdb"
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}
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