435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
70 lines
1.5 KiB
Go
70 lines
1.5 KiB
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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"path/filepath"
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"runtime"
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)
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func Main() {
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MainPath = filepath.Dir(findMainPath())
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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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host := ""
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if IsDevAppServer() {
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host = "127.0.0.1"
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}
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if err := http.ListenAndServe(host+":"+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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// Find the path to package main by looking at the root Caller.
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func findMainPath() string {
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pc := make([]uintptr, 100)
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n := runtime.Callers(2, pc)
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frames := runtime.CallersFrames(pc[:n])
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for {
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frame, more := frames.Next()
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// Tests won't have package main, instead they have testing.tRunner
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if frame.Function == "main.main" || frame.Function == "testing.tRunner" {
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return frame.File
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}
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if !more {
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break
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}
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}
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return ""
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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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