2009-10-30 11:58:53 -06:00
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// Copyright 2009 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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// godoc: Go Documentation Server
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// Web server tree:
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//
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// http://godoc/ main landing page
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// http://godoc/doc/ serve from $GOROOT/doc - spec, mem, tutorial, etc.
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// http://godoc/src/ serve files from $GOROOT/src; .go gets pretty-printed
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// http://godoc/cmd/ serve documentation about commands (TODO)
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// http://godoc/pkg/ serve documentation about packages
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// (idea is if you say import "compress/zlib", you go to
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// http://godoc/pkg/compress/zlib)
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//
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// Command-line interface:
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//
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// godoc packagepath [name ...]
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//
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// godoc compress/zlib
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// - prints doc for package compress/zlib
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// godoc crypto/block Cipher NewCMAC
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// - prints doc for Cipher and NewCMAC in package crypto/block
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package main
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import (
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"bytes"
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"flag"
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"fmt"
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"http"
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"io"
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"log"
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"os"
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pathutil "path"
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"time"
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)
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var (
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// periodic sync
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syncCmd = flag.String("sync", "", "sync command; disabled if empty")
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syncMin = flag.Int("sync_minutes", 0, "sync interval in minutes; disabled if <= 0")
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syncDelay delayTime // actual sync delay in minutes; usually syncDelay == syncMin, but delay may back off exponentially
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// server control
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httpaddr = flag.String("http", "", "HTTP service address (e.g., ':6060')")
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// layout control
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html = flag.Bool("html", false, "print HTML in command-line mode")
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genAST = flag.Bool("src", false, "print exported source in command-line mode")
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)
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2010-02-18 18:40:50 -07:00
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func serveError(c *http.Conn, r *http.Request, relpath string, err os.Error) {
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contents := applyTemplate(errorHTML, "errorHTML", err) // err may contain an absolute path!
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servePage(c, "File "+relpath, "", contents)
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}
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func exec(c *http.Conn, args []string) (status int) {
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r, w, err := os.Pipe()
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if err != nil {
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log.Stderrf("os.Pipe(): %v\n", err)
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return 2
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}
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bin := args[0]
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fds := []*os.File{nil, w, w}
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if *verbose {
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log.Stderrf("executing %v", args)
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}
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pid, err := os.ForkExec(bin, args, os.Environ(), goroot, fds)
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defer r.Close()
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w.Close()
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if err != nil {
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log.Stderrf("os.ForkExec(%q): %v\n", bin, err)
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return 2
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}
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var buf bytes.Buffer
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io.Copy(&buf, r)
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wait, err := os.Wait(pid, 0)
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if err != nil {
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os.Stderr.Write(buf.Bytes())
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log.Stderrf("os.Wait(%d, 0): %v\n", pid, err)
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return 2
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}
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status = wait.ExitStatus()
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if !wait.Exited() || status > 1 {
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os.Stderr.Write(buf.Bytes())
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log.Stderrf("executing %v failed (exit status = %d)", args, status)
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return
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}
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if *verbose {
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os.Stderr.Write(buf.Bytes())
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}
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if c != nil {
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c.SetHeader("content-type", "text/plain; charset=utf-8")
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c.Write(buf.Bytes())
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}
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2009-12-15 16:33:31 -07:00
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return
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}
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2009-11-03 20:40:26 -07:00
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// Maximum directory depth, adjust as needed.
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const maxDirDepth = 24
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func dosync(c *http.Conn, r *http.Request) {
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args := []string{"/bin/sh", "-c", *syncCmd}
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switch exec(c, args) {
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case 0:
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// sync succeeded and some files have changed;
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// update package tree.
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// TODO(gri): The directory tree may be temporarily out-of-sync.
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// Consider keeping separate time stamps so the web-
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// page can indicate this discrepancy.
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fsTree.set(newDirectory(goroot, maxDirDepth))
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fallthrough
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case 1:
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// sync failed because no files changed;
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// don't change the package tree
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syncDelay.set(*syncMin) // revert to regular sync schedule
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default:
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// sync failed because of an error - back off exponentially, but try at least once a day
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syncDelay.backoff(24 * 60)
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}
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}
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func usage() {
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fmt.Fprintf(os.Stderr,
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"usage: godoc package [name ...]\n"+
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" godoc -http=:6060\n")
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flag.PrintDefaults()
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os.Exit(2)
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}
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func loggingHandler(h http.Handler) http.Handler {
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return http.HandlerFunc(func(c *http.Conn, req *http.Request) {
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log.Stderrf("%s\t%s", c.RemoteAddr, req.URL)
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h.ServeHTTP(c, req)
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})
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}
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func main() {
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flag.Usage = usage
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flag.Parse()
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2009-11-09 00:42:00 -07:00
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// Check usage: either server and no args, or command line and args
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if (*httpaddr != "") != (flag.NArg() == 0) {
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usage()
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}
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if *tabwidth < 0 {
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log.Exitf("negative tabwidth %d", *tabwidth)
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}
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initHandlers()
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readTemplates()
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if *httpaddr != "" {
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// HTTP server mode.
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var handler http.Handler = http.DefaultServeMux
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if *verbose {
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log.Stderrf("Go Documentation Server\n")
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log.Stderrf("address = %s\n", *httpaddr)
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log.Stderrf("goroot = %s\n", goroot)
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log.Stderrf("tabwidth = %d\n", *tabwidth)
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if !fsMap.IsEmpty() {
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log.Stderr("user-defined mapping:")
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fsMap.Fprint(os.Stderr)
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}
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handler = loggingHandler(handler)
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}
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registerPublicHandlers(http.DefaultServeMux)
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if *syncCmd != "" {
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http.Handle("/debug/sync", http.HandlerFunc(dosync))
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}
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2009-11-03 20:40:26 -07:00
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// Initialize directory tree with corresponding timestamp.
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// Do it in two steps:
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// 1) set timestamp right away so that the indexer is kicked on
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fsTree.set(nil)
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// 2) compute initial directory tree in a goroutine so that launch is quick
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go func() { fsTree.set(newDirectory(goroot, maxDirDepth)) }()
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// Start sync goroutine, if enabled.
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if *syncCmd != "" && *syncMin > 0 {
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syncDelay.set(*syncMin) // initial sync delay
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go func() {
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for {
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dosync(nil, nil)
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delay, _ := syncDelay.get()
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if *verbose {
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log.Stderrf("next sync in %dmin", delay.(int))
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}
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time.Sleep(int64(delay.(int)) * 60e9)
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}
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}()
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}
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// Start indexing goroutine.
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go indexer()
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2009-11-02 10:25:39 -07:00
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// The server may have been restarted; always wait 1sec to
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// give the forking server a chance to shut down and release
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// the http port.
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// TODO(gri): Do we still need this?
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time.Sleep(1e9)
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2009-10-30 11:58:53 -06:00
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// Start http server.
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if err := http.ListenAndServe(*httpaddr, handler); err != nil {
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log.Exitf("ListenAndServe %s: %v", *httpaddr, err)
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}
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return
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}
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2009-11-02 10:25:39 -07:00
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// Command line mode.
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if *html {
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packageText = packageHTML
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}
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2010-02-19 17:23:19 -07:00
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// determine paths
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path := flag.Arg(0)
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if len(path) > 0 && path[0] == '.' {
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// assume cwd; don't assume -goroot
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cwd, _ := os.Getwd() // ignore errors
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path = pathutil.Join(cwd, path)
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}
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relpath := path
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abspath := path
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if len(path) > 0 && path[0] != '/' {
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abspath = absolutePath(path, pkgHandler.fsRoot)
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} else {
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relpath = relativePath(path)
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}
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2010-03-12 19:16:21 -07:00
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// TODO(gri): Provide a mechanism (flag?) to select a package
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// if there are multiple packages in a directory.
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info := pkgHandler.getPageInfo(abspath, relpath, "", *genAST, true)
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2010-03-10 16:22:22 -07:00
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if info.PAst == nil && info.PDoc == nil && info.Dirs == nil {
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// try again, this time assume it's a command
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if len(path) > 0 && path[0] != '/' {
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abspath = absolutePath(path, cmdHandler.fsRoot)
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}
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info = cmdHandler.getPageInfo(abspath, relpath, "", false, false)
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}
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if info.PDoc != nil && flag.NArg() > 1 {
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args := flag.Args()
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info.PDoc.Filter(args[1:])
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}
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if err := packageText.Execute(info, os.Stdout); err != nil {
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log.Stderrf("packageText.Execute: %s", err)
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}
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}
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