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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This file implements a stand-alone blog server.
package main
import (
"flag"
"log"
"net"
"net/http"
"os"
"os/exec"
"path/filepath"
"strings"
"golang.org/x/tools/blog"
)
var (
httpAddr = flag.String("http", "localhost:8080", "HTTP listen address")
contentPath = flag.String("content", "content/", "path to content files")
templatePath = flag.String("template", "template/", "path to template files")
staticPath = flag.String("static", "static/", "path to static files")
websitePath = flag.String("website", defaultWebsitePath(), "path to lib/godoc static files")
reload = flag.Bool("reload", false, "reload content on each page load")
)
func defaultWebsitePath() string {
out, err := exec.Command("go", "list", "-f", "{{.Dir}}", "golang.org/x/website/content/static").CombinedOutput()
if err != nil {
log.Printf("warning: locating -website directory: %v", err)
return ""
}
dir := strings.TrimSpace(string(out))
return dir
}
// maybeStatic serves from one of the two static directories
// (-static and -website) if possible, or else defers to the fallback handler.
func maybeStatic(fallback http.Handler) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
p := r.URL.Path
if strings.Contains(p, ".") && !strings.HasSuffix(p, "/") {
f := filepath.Join(*staticPath, p)
if _, err := os.Stat(f); err == nil {
http.ServeFile(w, r, f)
return
}
}
if strings.HasPrefix(p, "/lib/godoc/") {
f := filepath.Join(*websitePath, p[len("/lib/godoc/"):])
if _, err := os.Stat(f); err == nil {
http.ServeFile(w, r, f)
return
}
}
fallback.ServeHTTP(w, r)
}
}
func newServer(reload bool, config blog.Config) (http.Handler, error) {
mux := http.NewServeMux()
var h http.Handler
if reload {
h = http.HandlerFunc(reloadingBlogServer)
} else {
s, err := blog.NewServer(config)
if err != nil {
return nil, err
}
h = s
}
mux.Handle("/", maybeStatic(h))
return mux, nil
}
func main() {
flag.Parse()
if os.Getenv("GAE_ENV") == "standard" {
log.Println("running in App Engine Standard mode")
gaeMain()
return
}
config.ContentPath = *contentPath
config.TemplatePath = *templatePath
mux, err := newServer(*reload, config)
if err != nil {
log.Fatal(err)
}
ln, err := net.Listen("tcp", *httpAddr)
if err != nil {
log.Fatal(err)
}
log.Println("Listening on addr", *httpAddr)
log.Fatal(http.Serve(ln, mux))
}
// reloadingBlogServer is an handler that restarts the blog server on each page
// view. Inefficient; don't enable by default. Handy when editing blog content.
func reloadingBlogServer(w http.ResponseWriter, r *http.Request) {
s, err := blog.NewServer(config)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
s.ServeHTTP(w, r)
}
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