47 lines
1.6 KiB
Go
47 lines
1.6 KiB
Go
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/*
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Copyright 2016 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 healthcheck
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import (
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"fmt"
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"net/http"
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"github.com/golang/glog"
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)
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// A healthCheckHandler serves http requests on /healthz on the service health check node port,
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// and responds to every request with either:
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// 200 OK and the count of endpoints for the given service that are local to this node.
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// or
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// 503 Service Unavailable If the count is zero or the service does not exist
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type healthCheckHandler struct {
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svcNsName string
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}
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// HTTP Utility function to send the required statusCode and error text to a http.ResponseWriter object
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func sendHealthCheckResponse(rw http.ResponseWriter, statusCode int, error string) {
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rw.Header().Set("Content-Type", "text/plain")
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rw.WriteHeader(statusCode)
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fmt.Fprint(rw, error)
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}
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// ServeHTTP: Interface callback method for net.Listener Handlers
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func (h healthCheckHandler) ServeHTTP(response http.ResponseWriter, req *http.Request) {
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glog.V(4).Infof("Received HC Request Service %s from Cloud Load Balancer", h.svcNsName)
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healthchecker.handleHealthCheckRequest(response, h.svcNsName)
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}
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