mirror of https://github.com/k3s-io/k3s
55 lines
1.6 KiB
Go
55 lines
1.6 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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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 health
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import (
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"net/http"
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"github.com/golang/glog"
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)
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type Status int
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// Status takes only one of values of these constants.
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const (
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Healthy Status = iota
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Unhealthy
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Unknown
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)
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// HTTPGetInterface is an abstract interface for testability. It abstracts the interface of http.Client.Get.
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type HTTPGetInterface interface {
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Get(url string) (*http.Response, error)
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}
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// Check checks if a GET request to the url succeeds.
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// If the HTTP response code is successful (i.e. 400 > code >= 200), it returns Healthy.
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// If the HTTP response code is unsuccessful, it returns Unhealthy.
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// It returns Unknown and err if the HTTP communication itself fails.
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func Check(url string, client HTTPGetInterface) (Status, error) {
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res, err := client.Get(url)
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if err != nil {
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return Unknown, err
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}
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defer res.Body.Close()
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if res.StatusCode >= http.StatusOK && res.StatusCode < http.StatusBadRequest {
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return Healthy, nil
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}
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glog.V(1).Infof("Health check failed for %s, Response: %v", url, *res)
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return Unhealthy, nil
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}
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