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45 lines
936 B
Go
45 lines
936 B
Go
// Copyright 2011 Google Inc. All rights reserved.
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// Use of this source code is governed by the Apache 2.0
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// license that can be found in the LICENSE file.
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// +build !appengine
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package internal
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import (
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"io"
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"log"
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"net/http"
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"net/url"
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"os"
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)
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func Main() {
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installHealthChecker(http.DefaultServeMux)
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port := "8080"
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if s := os.Getenv("PORT"); s != "" {
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port = s
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}
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if err := http.ListenAndServe(":"+port, http.HandlerFunc(handleHTTP)); err != nil {
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log.Fatalf("http.ListenAndServe: %v", err)
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}
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}
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func installHealthChecker(mux *http.ServeMux) {
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// If no health check handler has been installed by this point, add a trivial one.
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const healthPath = "/_ah/health"
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hreq := &http.Request{
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Method: "GET",
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URL: &url.URL{
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Path: healthPath,
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},
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}
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if _, pat := mux.Handler(hreq); pat != healthPath {
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mux.HandleFunc(healthPath, func(w http.ResponseWriter, r *http.Request) {
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io.WriteString(w, "ok")
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})
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}
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}
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