60 lines
1.7 KiB
Go
60 lines
1.7 KiB
Go
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/*
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Copyright 2019 The Kubernetes 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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package framework
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import (
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"fmt"
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"net/http"
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dto "github.com/prometheus/client_model/go"
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"github.com/prometheus/common/expfmt"
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)
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// GetMetric returns the current prometheus metric exposed by NGINX
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func (f *Framework) GetMetric(metricName, ip string) (*dto.MetricFamily, error) {
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url := fmt.Sprintf("http://%v:10254/metrics", ip)
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client := &http.Client{}
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req, err := http.NewRequest("GET", url, nil)
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if err != nil {
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return nil, fmt.Errorf("creating GET request for URL %q failed: %v", url, err)
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}
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resp, err := client.Do(req)
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if err != nil {
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return nil, fmt.Errorf("executing GET request for URL %q failed: %v", url, err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("GET request for URL %q returned HTTP status %s", url, resp.Status)
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}
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var parser expfmt.TextParser
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metrics, err := parser.TextToMetricFamilies(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("reading text format failed: %v", err)
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}
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for _, m := range metrics {
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if m.GetName() == metricName {
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return m, nil
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}
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}
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return nil, fmt.Errorf("there is no metric with name %v", metricName)
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}
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