85 lines
2.4 KiB
Go
85 lines
2.4 KiB
Go
/*
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Copyright 2015 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 metrics
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import (
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"fmt"
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"io/ioutil"
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"net/http"
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"time"
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)
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type KubeletMetrics Metrics
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func (m *KubeletMetrics) Equal(o KubeletMetrics) bool {
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return (*Metrics)(m).Equal(Metrics(o))
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}
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func NewKubeletMetrics() KubeletMetrics {
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result := NewMetrics()
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return KubeletMetrics(result)
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}
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// GrabKubeletMetricsWithoutProxy retrieve metrics from the kubelet on the given node using a simple GET over http.
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// Currently only used in integration tests.
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func GrabKubeletMetricsWithoutProxy(nodeName string) (KubeletMetrics, error) {
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metricsEndpoint := "http://%s/metrics"
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resp, err := http.Get(fmt.Sprintf(metricsEndpoint, nodeName))
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if err != nil {
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return KubeletMetrics{}, err
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return KubeletMetrics{}, err
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}
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return parseKubeletMetrics(string(body))
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}
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func parseKubeletMetrics(data string) (KubeletMetrics, error) {
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result := NewKubeletMetrics()
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if err := parseMetrics(data, (*Metrics)(&result)); err != nil {
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return KubeletMetrics{}, err
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}
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return result, nil
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}
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func (g *MetricsGrabber) getMetricsFromNode(nodeName string, kubeletPort int) (string, error) {
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// There's a problem with timing out during proxy. Wrapping this in a goroutine to prevent deadlock.
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// Hanging goroutine will be leaked.
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finished := make(chan struct{})
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var err error
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var rawOutput []byte
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go func() {
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rawOutput, err = g.client.Core().RESTClient().Get().
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Prefix("proxy").
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Resource("nodes").
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Name(fmt.Sprintf("%v:%v", nodeName, kubeletPort)).
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Suffix("metrics").
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Do().Raw()
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finished <- struct{}{}
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}()
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select {
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case <-time.After(ProxyTimeout):
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return "", fmt.Errorf("Timed out when waiting for proxy to gather metrics from %v", nodeName)
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case <-finished:
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if err != nil {
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return "", err
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}
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return string(rawOutput), nil
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}
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}
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