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// Copyright 2015 Matthew Holt and The Caddy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package caddy
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"log"
"net"
"net/http"
"net/http/pprof"
"strings"
"sync"
"time"
"github.com/rs/cors"
)
var (
cfgEndptSrv *http.Server
cfgEndptSrvMu sync.Mutex
)
// AdminConfig configures the admin endpoint.
type AdminConfig struct {
Listen string `json:"listen,omitempty"`
}
// DefaultAdminConfig is the default configuration
// for the administration endpoint.
var DefaultAdminConfig = &AdminConfig{
Listen: DefaultAdminListen,
}
// StartAdmin starts Caddy's administration endpoint,
// bootstrapping it with an optional configuration
// in the format of JSON bytes. It opens a listener
// resource. When no longer needed, StopAdmin should
// be called.
func StartAdmin(initialConfigJSON []byte) error {
cfgEndptSrvMu.Lock()
defer cfgEndptSrvMu.Unlock()
adminConfig := DefaultAdminConfig
if len(initialConfigJSON) > 0 {
var config *Config
err := json.Unmarshal(initialConfigJSON, &config)
if err != nil {
return fmt.Errorf("unmarshaling bootstrap config: %v", err)
}
if config != nil && config.Admin != nil {
adminConfig = config.Admin
}
if cfgEndptSrv != nil {
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
err := cfgEndptSrv.Shutdown(ctx)
if err != nil {
return fmt.Errorf("shutting down old admin endpoint: %v", err)
}
}
}
ln, err := net.Listen("tcp", adminConfig.Listen)
if err != nil {
return err
}
mux := http.NewServeMux()
mux.HandleFunc("/load", handleLoadConfig)
///// BEGIN PPROF STUFF (TODO: Temporary) /////
mux.HandleFunc("/debug/pprof/", pprof.Index)
mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
///// END PPROF STUFF //////
for _, m := range GetModules("admin") {
route := m.New().(AdminRoute)
mux.Handle(route.Pattern, route)
}
handler := cors.Default().Handler(mux)
cfgEndptSrv = &http.Server{
Handler: handler,
ReadTimeout: 5 * time.Second,
ReadHeaderTimeout: 5 * time.Second,
IdleTimeout: 5 * time.Second,
MaxHeaderBytes: 1024 * 256,
}
go cfgEndptSrv.Serve(ln)
log.Println("Caddy 2 admin endpoint listening on", adminConfig.Listen)
if len(initialConfigJSON) > 0 {
err := Load(bytes.NewReader(initialConfigJSON))
if err != nil {
return fmt.Errorf("loading initial config: %v", err)
}
log.Println("Caddy 2 serving initial configuration")
}
return nil
}
// StopAdmin stops the API endpoint.
func StopAdmin() error {
cfgEndptSrvMu.Lock()
defer cfgEndptSrvMu.Unlock()
if cfgEndptSrv == nil {
return fmt.Errorf("no server")
}
err := cfgEndptSrv.Shutdown(context.Background()) // TODO
if err != nil {
return fmt.Errorf("shutting down server: %v", err)
}
cfgEndptSrv = nil
return nil
}
// AdminRoute represents a route for the admin endpoint.
type AdminRoute struct {
http.Handler
Pattern string
}
func handleLoadConfig(w http.ResponseWriter, r *http.Request) {
r.Close = true
if r.Method != "POST" {
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
if !strings.Contains(r.Header.Get("Content-Type"), "/json") {
http.Error(w, "unacceptable Content-Type", http.StatusBadRequest)
return
}
err := Load(r.Body)
if err != nil {
log.Printf("[ADMIN][ERROR] loading config: %v", err)
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
}
// Load loads and starts a configuration.
func Load(r io.Reader) error {
buf := bufPool.Get().(*bytes.Buffer)
buf.Reset()
defer bufPool.Put(buf)
_, err := io.Copy(buf, io.LimitReader(r, 1024*1024))
if err != nil {
return err
}
var cfg *Config
err = json.Unmarshal(buf.Bytes(), &cfg)
if err != nil {
return fmt.Errorf("decoding config: %v", err)
}
err = Run(cfg)
if err != nil {
return fmt.Errorf("running: %v", err)
}
return nil
}
// DefaultAdminListen is the address for the admin
// listener, if none is specified at startup.
var DefaultAdminListen = "localhost:2019"
var bufPool = sync.Pool{
New: func() interface{} {
return new(bytes.Buffer)
},
}
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