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metrics.go
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/
metrics.go
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// Copyright 2023 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 main
import (
"bytes"
"context"
"fmt"
"io"
"net/http"
"net/url"
"os"
"time"
"github.com/golang/snappy"
config_util "github.com/prometheus/common/config"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/storage/remote"
"github.com/prometheus/prometheus/util/fmtutil"
)
// Push metrics to a prometheus remote write (for testing purpose only).
func PushMetrics(url *url.URL, roundTripper http.RoundTripper, headers map[string]string, timeout time.Duration, labels map[string]string, files ...string) int {
addressURL, err := url.Parse(url.String())
if err != nil {
fmt.Fprintln(os.Stderr, err)
return failureExitCode
}
// build remote write client
writeClient, err := remote.NewWriteClient("remote-write", &remote.ClientConfig{
URL: &config_util.URL{URL: addressURL},
Timeout: model.Duration(timeout),
})
if err != nil {
fmt.Fprintln(os.Stderr, err)
return failureExitCode
}
// set custom tls config from httpConfigFilePath
// set custom headers to every request
client, ok := writeClient.(*remote.Client)
if !ok {
fmt.Fprintln(os.Stderr, fmt.Errorf("unexpected type %T", writeClient))
return failureExitCode
}
client.Client.Transport = &setHeadersTransport{
RoundTripper: roundTripper,
headers: headers,
}
var data []byte
var failed bool
if len(files) == 0 {
data, err = io.ReadAll(os.Stdin)
if err != nil {
fmt.Fprintln(os.Stderr, " FAILED:", err)
return failureExitCode
}
fmt.Printf("Parsing standard input\n")
if parseAndPushMetrics(client, data, labels) {
fmt.Printf(" SUCCESS: metrics pushed to remote write.\n")
return successExitCode
}
return failureExitCode
}
for _, file := range files {
data, err = os.ReadFile(file)
if err != nil {
fmt.Fprintln(os.Stderr, " FAILED:", err)
failed = true
continue
}
fmt.Printf("Parsing metrics file %s\n", file)
if parseAndPushMetrics(client, data, labels) {
fmt.Printf(" SUCCESS: metrics file %s pushed to remote write.\n", file)
continue
}
failed = true
}
if failed {
return failureExitCode
}
return successExitCode
}
func parseAndPushMetrics(client *remote.Client, data []byte, labels map[string]string) bool {
metricsData, err := fmtutil.MetricTextToWriteRequest(bytes.NewReader(data), labels)
if err != nil {
fmt.Fprintln(os.Stderr, " FAILED:", err)
return false
}
raw, err := metricsData.Marshal()
if err != nil {
fmt.Fprintln(os.Stderr, " FAILED:", err)
return false
}
// Encode the request body into snappy encoding.
compressed := snappy.Encode(nil, raw)
err = client.Store(context.Background(), compressed, 0)
if err != nil {
fmt.Fprintln(os.Stderr, " FAILED:", err)
return false
}
return true
}
type setHeadersTransport struct {
http.RoundTripper
headers map[string]string
}
func (s *setHeadersTransport) RoundTrip(req *http.Request) (*http.Response, error) {
for key, value := range s.headers {
req.Header.Set(key, value)
}
return s.RoundTripper.RoundTrip(req)
}