82 lines
1.9 KiB
Go
82 lines
1.9 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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"go/build"
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"log"
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"net/http"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"sync"
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"golang.org/x/tools/blog"
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"golang.org/x/tools/godoc/redirect"
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)
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const (
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blogRepo = "golang.org/x/blog"
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blogURL = "http://blog.golang.org/"
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blogPath = "/blog/"
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)
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var (
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blogServer http.Handler // set by blogInit
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blogInitOnce sync.Once
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playEnabled bool
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)
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func init() {
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// Initialize blog only when first accessed.
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http.HandleFunc(blogPath, func(w http.ResponseWriter, r *http.Request) {
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blogInitOnce.Do(blogInit)
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blogServer.ServeHTTP(w, r)
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})
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}
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func blogInit() {
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// Binary distributions will include the blog content in "/blog".
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root := filepath.Join(runtime.GOROOT(), "blog")
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// Prefer content from go.blog repository if present.
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if pkg, err := build.Import(blogRepo, "", build.FindOnly); err == nil {
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root = pkg.Dir
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}
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// If content is not available fall back to redirect.
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if fi, err := os.Stat(root); err != nil || !fi.IsDir() {
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fmt.Fprintf(os.Stderr, "Blog content not available locally. "+
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"To install, run \n\tgo get %v\n", blogRepo)
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blogServer = http.HandlerFunc(blogRedirectHandler)
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return
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}
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s, err := blog.NewServer(blog.Config{
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BaseURL: blogPath,
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BasePath: strings.TrimSuffix(blogPath, "/"),
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ContentPath: filepath.Join(root, "content"),
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TemplatePath: filepath.Join(root, "template"),
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HomeArticles: 5,
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PlayEnabled: playEnabled,
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})
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if err != nil {
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log.Fatal(err)
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}
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blogServer = s
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}
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func blogRedirectHandler(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path == blogPath {
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http.Redirect(w, r, blogURL, http.StatusFound)
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return
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}
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blogPrefixHandler.ServeHTTP(w, r)
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}
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var blogPrefixHandler = redirect.PrefixHandler(blogPath, blogURL)
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