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Make prow/metrics compatible with prometheus/client_golang v1.0.0
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| /* | ||
| Copyright 2019 The Kubernetes 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. | ||
| */ | ||
|
|
||
| // This file is a copy from upstream where it was removed in | ||
| // https://github.com/prometheus/client_golang/pull/600 | ||
| package metrics | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "io/ioutil" | ||
| "net/http" | ||
| "net/url" | ||
| "os" | ||
| "strings" | ||
|
|
||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/common/expfmt" | ||
| "github.com/prometheus/common/model" | ||
| ) | ||
|
|
||
| const contentTypeHeader = "Content-Type" | ||
|
|
||
| func fromGatherer(job string, grouping map[string]string, url string, g prometheus.Gatherer) error { | ||
| return push(job, grouping, url, g, "PUT") | ||
| } | ||
|
|
||
| func push(job string, grouping map[string]string, pushURL string, g prometheus.Gatherer, method string) error { | ||
| if !strings.Contains(pushURL, "://") { | ||
| pushURL = "http://" + pushURL | ||
| } | ||
| if strings.HasSuffix(pushURL, "/") { | ||
| pushURL = pushURL[:len(pushURL)-1] | ||
| } | ||
|
|
||
| if strings.Contains(job, "/") { | ||
| return fmt.Errorf("job contains '/': %s", job) | ||
| } | ||
| urlComponents := []string{url.QueryEscape(job)} | ||
| for ln, lv := range grouping { | ||
| if !model.LabelName(ln).IsValid() { | ||
| return fmt.Errorf("grouping label has invalid name: %s", ln) | ||
| } | ||
| if strings.Contains(lv, "/") { | ||
| return fmt.Errorf("value of grouping label %s contains '/': %s", ln, lv) | ||
| } | ||
| urlComponents = append(urlComponents, ln, lv) | ||
| } | ||
| pushURL = fmt.Sprintf("%s/metrics/job/%s", pushURL, strings.Join(urlComponents, "/")) | ||
|
|
||
| mfs, err := g.Gather() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| buf := &bytes.Buffer{} | ||
| enc := expfmt.NewEncoder(buf, expfmt.FmtProtoDelim) | ||
| // Check for pre-existing grouping labels: | ||
| for _, mf := range mfs { | ||
| for _, m := range mf.GetMetric() { | ||
| for _, l := range m.GetLabel() { | ||
| if l.GetName() == "job" { | ||
| return fmt.Errorf("pushed metric %s (%s) already contains a job label", mf.GetName(), m) | ||
| } | ||
| if _, ok := grouping[l.GetName()]; ok { | ||
| return fmt.Errorf( | ||
| "pushed metric %s (%s) already contains grouping label %s", | ||
| mf.GetName(), m, l.GetName(), | ||
| ) | ||
| } | ||
| } | ||
| } | ||
| enc.Encode(mf) | ||
| } | ||
| req, err := http.NewRequest(method, pushURL, buf) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| req.Header.Set(contentTypeHeader, string(expfmt.FmtProtoDelim)) | ||
| resp, err := http.DefaultClient.Do(req) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer resp.Body.Close() | ||
| if resp.StatusCode != 202 { | ||
| body, _ := ioutil.ReadAll(resp.Body) // Ignore any further error as this is for an error message only. | ||
| return fmt.Errorf("unexpected status code %d while pushing to %s: %s", resp.StatusCode, pushURL, body) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func hostnameGroupingKey() map[string]string { | ||
| hostname, err := os.Hostname() | ||
| if err != nil { | ||
| return map[string]string{"instance": "unknown"} | ||
| } | ||
| return map[string]string{"instance": hostname} | ||
| } |