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// 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.
package rpc
Some HTML presented at http://machine:port/debug/rpc
Lists services, their methods, and some statistics, still rudimentary.
import (
const debugText = `<html>
{{range .}}
Service {{.Name}}
<th align=center>Method</th><th align=center>Calls</th>
{{range .Method}}
<td align=left font=fixed>{{.Name}}({{.Type.ArgType}}, {{.Type.ReplyType}}) error</td>
<td align=center>{{.Type.NumCalls}}</td>
var debug = template.Must(template.New("RPC debug").Parse(debugText))
// If set, print log statements for internal and I/O errors.
var debugLog = false
type debugMethod struct {
Type *methodType
Name string
type methodArray []debugMethod
type debugService struct {
Service *service
Name string
Method methodArray
type serviceArray []debugService
func (s serviceArray) Len() int { return len(s) }
func (s serviceArray) Less(i, j int) bool { return s[i].Name < s[j].Name }
func (s serviceArray) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func (m methodArray) Len() int { return len(m) }
func (m methodArray) Less(i, j int) bool { return m[i].Name < m[j].Name }
func (m methodArray) Swap(i, j int) { m[i], m[j] = m[j], m[i] }
type debugHTTP struct {
// Runs at /debug/rpc
func (server debugHTTP) ServeHTTP(w http.ResponseWriter, req *http.Request) {
// Build a sorted version of the data.
var services serviceArray
server.serviceMap.Range(func(snamei, svci interface{}) bool {
svc := svci.(*service)
ds := debugService{svc, snamei.(string), make(methodArray, 0, len(svc.method))}
for mname, method := range svc.method {
ds.Method = append(ds.Method, debugMethod{method, mname})
services = append(services, ds)
return true
err := debug.Execute(w, services)
if err != nil {
fmt.Fprintln(w, "rpc: error executing template:", err.Error())