blob: 3496013c15192dacca124d66d324aef70df21932 [file] [log] [blame]
// Copyright 2009 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.
// godoc: Go Documentation Server
// Web server tree:
//
// http://godoc/ main landing page
// http://godoc/doc/ serve from $GOROOT/doc - spec, mem, etc.
// http://godoc/src/ serve files from $GOROOT/src; .go gets pretty-printed
// http://godoc/cmd/ serve documentation about commands
// http://godoc/pkg/ serve documentation about packages
// (idea is if you say import "compress/zlib", you go to
// http://godoc/pkg/compress/zlib)
//
// Command-line interface:
//
// godoc packagepath [name ...]
//
// godoc compress/zlib
// - prints doc for package compress/zlib
// godoc crypto/block Cipher NewCMAC
// - prints doc for Cipher and NewCMAC in package crypto/block
// +build !appengine
package main
import (
"archive/zip"
_ "expvar" // to serve /debug/vars
"flag"
"fmt"
"go/build"
"log"
"net/http"
"net/http/httptest"
_ "net/http/pprof" // to serve /debug/pprof/*
"net/url"
"os"
"path/filepath"
"regexp"
"runtime"
"strings"
"golang.org/x/tools/godoc"
"golang.org/x/tools/godoc/analysis"
"golang.org/x/tools/godoc/static"
"golang.org/x/tools/godoc/vfs"
"golang.org/x/tools/godoc/vfs/gatefs"
"golang.org/x/tools/godoc/vfs/mapfs"
"golang.org/x/tools/godoc/vfs/zipfs"
)
const (
defaultAddr = ":6060" // default webserver address
toolsPath = "golang.org/x/tools/cmd/"
)
var (
// file system to serve
// (with e.g.: zip -r go.zip $GOROOT -i \*.go -i \*.html -i \*.css -i \*.js -i \*.txt -i \*.c -i \*.h -i \*.s -i \*.png -i \*.jpg -i \*.sh -i favicon.ico)
zipfile = flag.String("zip", "", "zip file providing the file system to serve; disabled if empty")
// file-based index
writeIndex = flag.Bool("write_index", false, "write index to a file; the file name must be specified with -index_files")
analysisFlag = flag.String("analysis", "", `comma-separated list of analyses to perform (supported: type, pointer). See http://golang.org/lib/godoc/analysis/help.html`)
// network
httpAddr = flag.String("http", "", "HTTP service address (e.g., '"+defaultAddr+"')")
serverAddr = flag.String("server", "", "webserver address for command line searches")
// layout control
html = flag.Bool("html", false, "print HTML in command-line mode")
srcMode = flag.Bool("src", false, "print (exported) source in command-line mode")
urlFlag = flag.String("url", "", "print HTML for named URL")
// command-line searches
query = flag.Bool("q", false, "arguments are considered search queries")
verbose = flag.Bool("v", false, "verbose mode")
// file system roots
// TODO(gri) consider the invariant that goroot always end in '/'
goroot = flag.String("goroot", runtime.GOROOT(), "Go root directory")
// layout control
tabWidth = flag.Int("tabwidth", 4, "tab width")
showTimestamps = flag.Bool("timestamps", false, "show timestamps with directory listings")
templateDir = flag.String("templates", "", "directory containing alternate template files")
showPlayground = flag.Bool("play", false, "enable playground in web interface")
showExamples = flag.Bool("ex", false, "show examples in command line mode")
declLinks = flag.Bool("links", true, "link identifiers to their declarations")
// search index
indexEnabled = flag.Bool("index", false, "enable search index")
indexFiles = flag.String("index_files", "", "glob pattern specifying index files; if not empty, the index is read from these files in sorted order")
indexInterval = flag.Duration("index_interval", 0, "interval of indexing; 0 for default (5m), negative to only index once at startup")
maxResults = flag.Int("maxresults", 10000, "maximum number of full text search results shown")
indexThrottle = flag.Float64("index_throttle", 0.75, "index throttle value; 0.0 = no time allocated, 1.0 = full throttle")
// source code notes
notesRx = flag.String("notes", "BUG", "regular expression matching note markers to show")
)
func usage() {
fmt.Fprintf(os.Stderr,
"usage: godoc package [name ...]\n"+
" godoc -http="+defaultAddr+"\n")
flag.PrintDefaults()
os.Exit(2)
}
func loggingHandler(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
log.Printf("%s\t%s", req.RemoteAddr, req.URL)
h.ServeHTTP(w, req)
})
}
func handleURLFlag() {
// Try up to 10 fetches, following redirects.
urlstr := *urlFlag
for i := 0; i < 10; i++ {
// Prepare request.
u, err := url.Parse(urlstr)
if err != nil {
log.Fatal(err)
}
req := &http.Request{
URL: u,
}
// Invoke default HTTP handler to serve request
// to our buffering httpWriter.
w := httptest.NewRecorder()
http.DefaultServeMux.ServeHTTP(w, req)
// Return data, error, or follow redirect.
switch w.Code {
case 200: // ok
os.Stdout.Write(w.Body.Bytes())
return
case 301, 302, 303, 307: // redirect
redirect := w.HeaderMap.Get("Location")
if redirect == "" {
log.Fatalf("HTTP %d without Location header", w.Code)
}
urlstr = redirect
default:
log.Fatalf("HTTP error %d", w.Code)
}
}
log.Fatalf("too many redirects")
}
func main() {
flag.Usage = usage
flag.Parse()
playEnabled = *showPlayground
// Check usage: either server and no args, command line and args, or index creation mode
if (*httpAddr != "" || *urlFlag != "") != (flag.NArg() == 0) && !*writeIndex {
usage()
}
var fsGate chan bool
fsGate = make(chan bool, 20)
// Determine file system to use.
if *zipfile == "" {
// use file system of underlying OS
rootfs := gatefs.New(vfs.OS(*goroot), fsGate)
fs.Bind("/", rootfs, "/", vfs.BindReplace)
} else {
// use file system specified via .zip file (path separator must be '/')
rc, err := zip.OpenReader(*zipfile)
if err != nil {
log.Fatalf("%s: %s\n", *zipfile, err)
}
defer rc.Close() // be nice (e.g., -writeIndex mode)
fs.Bind("/", zipfs.New(rc, *zipfile), *goroot, vfs.BindReplace)
}
if *templateDir != "" {
fs.Bind("/lib/godoc", vfs.OS(*templateDir), "/", vfs.BindBefore)
} else {
fs.Bind("/lib/godoc", mapfs.New(static.Files), "/", vfs.BindReplace)
}
// Bind $GOPATH trees into Go root.
for _, p := range filepath.SplitList(build.Default.GOPATH) {
fs.Bind("/src", gatefs.New(vfs.OS(p), fsGate), "/src", vfs.BindAfter)
}
httpMode := *httpAddr != ""
var typeAnalysis, pointerAnalysis bool
if *analysisFlag != "" {
for _, a := range strings.Split(*analysisFlag, ",") {
switch a {
case "type":
typeAnalysis = true
case "pointer":
pointerAnalysis = true
default:
log.Fatalf("unknown analysis: %s", a)
}
}
}
corpus := godoc.NewCorpus(fs)
corpus.Verbose = *verbose
corpus.MaxResults = *maxResults
corpus.IndexEnabled = *indexEnabled && httpMode
if *maxResults == 0 {
corpus.IndexFullText = false
}
corpus.IndexFiles = *indexFiles
corpus.IndexDirectory = indexDirectoryDefault
corpus.IndexThrottle = *indexThrottle
corpus.IndexInterval = *indexInterval
if *writeIndex {
corpus.IndexThrottle = 1.0
corpus.IndexEnabled = true
}
if *writeIndex || httpMode || *urlFlag != "" {
if err := corpus.Init(); err != nil {
log.Fatal(err)
}
}
pres = godoc.NewPresentation(corpus)
pres.TabWidth = *tabWidth
pres.ShowTimestamps = *showTimestamps
pres.ShowPlayground = *showPlayground
pres.ShowExamples = *showExamples
pres.DeclLinks = *declLinks
pres.SrcMode = *srcMode
pres.HTMLMode = *html
if *notesRx != "" {
pres.NotesRx = regexp.MustCompile(*notesRx)
}
readTemplates(pres, httpMode || *urlFlag != "")
registerHandlers(pres)
if *writeIndex {
// Write search index and exit.
if *indexFiles == "" {
log.Fatal("no index file specified")
}
log.Println("initialize file systems")
*verbose = true // want to see what happens
corpus.UpdateIndex()
log.Println("writing index file", *indexFiles)
f, err := os.Create(*indexFiles)
if err != nil {
log.Fatal(err)
}
index, _ := corpus.CurrentIndex()
_, err = index.WriteTo(f)
if err != nil {
log.Fatal(err)
}
log.Println("done")
return
}
// Print content that would be served at the URL *urlFlag.
if *urlFlag != "" {
handleURLFlag()
return
}
if httpMode {
// HTTP server mode.
var handler http.Handler = http.DefaultServeMux
if *verbose {
log.Printf("Go Documentation Server")
log.Printf("version = %s", runtime.Version())
log.Printf("address = %s", *httpAddr)
log.Printf("goroot = %s", *goroot)
log.Printf("tabwidth = %d", *tabWidth)
switch {
case !*indexEnabled:
log.Print("search index disabled")
case *maxResults > 0:
log.Printf("full text index enabled (maxresults = %d)", *maxResults)
default:
log.Print("identifier search index enabled")
}
fs.Fprint(os.Stderr)
handler = loggingHandler(handler)
}
// Initialize search index.
if *indexEnabled {
go corpus.RunIndexer()
}
// Start type/pointer analysis.
if typeAnalysis || pointerAnalysis {
go analysis.Run(pointerAnalysis, &corpus.Analysis)
}
// Start http server.
if err := http.ListenAndServe(*httpAddr, handler); err != nil {
log.Fatalf("ListenAndServe %s: %v", *httpAddr, err)
}
return
}
if *query {
handleRemoteSearch()
return
}
if err := godoc.CommandLine(os.Stdout, fs, pres, flag.Args()); err != nil {
log.Print(err)
}
}