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//
// rhctl
//
// Copyright (C) 2009-2016 Christian Pointner <equinox@helsinki.at>
//
// This file is part of rhctl.
//
// rhctl is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// rhctl is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with rhctl. If not, see <http://www.gnu.org/licenses/>.
//
package main
import (
"encoding/json"
"fmt"
"net/http"
"time"
)
type WebInterface struct {
server *http.Server
}
type webHandler struct {
ctrl *SwitchControl
H func(*SwitchControl, http.ResponseWriter, *http.Request)
}
func (self webHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
self.H(self.ctrl, w, r)
}
func webSendResponse(w http.ResponseWriter, status int, respdata interface{}) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(status)
encoder := json.NewEncoder(w)
encoder.Encode(respdata)
}
type webError struct {
ResponseCode int `json:"RESPONSE_CODE"`
ErrorString string `json:"ERROR_STRING"`
}
func webSendErrorResponse(w http.ResponseWriter, status int, error string) {
webSendResponse(w, http.StatusOK, webError{ResponseCode: status, ErrorString: error})
}
func webGetStateHandler(ctrl *SwitchControl, w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
webSendErrorResponse(w, http.StatusMethodNotAllowed, "only GET method is allowed")
return
}
resp := make(chan interface{})
ctrl.Commands <- &Command{Type: CmdState, Response: resp}
result := <-resp
switch result.(type) {
case State:
webSendResponse(w, http.StatusOK, result.(State))
case error:
webSendErrorResponse(w, http.StatusInternalServerError, result.(error).Error())
default:
webSendErrorResponse(w, http.StatusInternalServerError, fmt.Sprintf("invalid response of type %T: %+v", result, result))
}
}
func (web *WebInterface) Run() {
rhdl.Printf("Web: handler running...")
if err := web.server.ListenAndServe(); err != nil {
rhl.Printf("Web: server returned: %s", err)
}
}
func WebInit(conf *Config, ctrl *SwitchControl) (web *WebInterface) {
web = &WebInterface{}
if conf.Clients.Web.StaticDir != "" {
rhdl.Printf("Web: will serving static files from '%s'", conf.Clients.Web.StaticDir)
http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir(conf.Clients.Web.StaticDir))))
}
http.Handle("/api/state", webHandler{ctrl, webGetStateHandler})
// TODO: add other handler
web.server = &http.Server{Addr: conf.Clients.Web.Address, ReadTimeout: 2 * time.Hour, WriteTimeout: 2 * time.Hour}
return
}
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