prometheus/storage/remote/client.go

121 lines
3.0 KiB
Go

// Copyright 2016 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package remote
import (
"bytes"
"fmt"
"net/http"
"time"
"github.com/golang/protobuf/proto"
"github.com/golang/snappy"
"golang.org/x/net/context"
"golang.org/x/net/context/ctxhttp"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/util/httputil"
)
// Client allows sending batches of Prometheus samples to an HTTP endpoint.
type Client struct {
url config.URL
client *http.Client
timeout time.Duration
}
// NewClient creates a new Client.
func NewClient(conf config.RemoteWriteConfig) (*Client, error) {
tlsConfig, err := httputil.NewTLSConfig(conf.TLSConfig)
if err != nil {
return nil, err
}
// The only timeout we care about is the configured push timeout.
// It is applied on request. So we leave out any timings here.
var rt http.RoundTripper = &http.Transport{
Proxy: http.ProxyURL(conf.ProxyURL.URL),
TLSClientConfig: tlsConfig,
}
if conf.BasicAuth != nil {
rt = httputil.NewBasicAuthRoundTripper(conf.BasicAuth.Username, conf.BasicAuth.Password, rt)
}
return &Client{
url: *conf.URL,
client: httputil.NewClient(rt),
timeout: time.Duration(conf.RemoteTimeout),
}, nil
}
// Store sends a batch of samples to the HTTP endpoint.
func (c *Client) Store(samples model.Samples) error {
req := &WriteRequest{
Timeseries: make([]*TimeSeries, 0, len(samples)),
}
for _, s := range samples {
ts := &TimeSeries{
Labels: make([]*LabelPair, 0, len(s.Metric)),
}
for k, v := range s.Metric {
ts.Labels = append(ts.Labels,
&LabelPair{
Name: string(k),
Value: string(v),
})
}
ts.Samples = []*Sample{
{
Value: float64(s.Value),
TimestampMs: int64(s.Timestamp),
},
}
req.Timeseries = append(req.Timeseries, ts)
}
data, err := proto.Marshal(req)
if err != nil {
return err
}
buf := bytes.Buffer{}
if _, err := snappy.NewWriter(&buf).Write(data); err != nil {
return err
}
httpReq, err := http.NewRequest("POST", c.url.String(), &buf)
if err != nil {
return err
}
httpReq.Header.Add("Content-Encoding", "snappy")
ctx, _ := context.WithTimeout(context.Background(), c.timeout)
httpResp, err := ctxhttp.Do(ctx, c.client, httpReq)
if err != nil {
return err
}
defer httpResp.Body.Close()
if httpResp.StatusCode/100 != 2 {
return fmt.Errorf("server returned HTTP status %s", httpResp.Status)
}
return nil
}
// Name identifies the client as a generic client.
func (c Client) Name() string {
return "generic"
}