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//
// rhimportd
//
// The Radio Helsinki Rivendell Import Daemon
//
//
// Copyright (C) 2015 Christian Pointner <equinox@helsinki.at>
//
// This file is part of rhimportd.
//
// rhimportd 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.
//
// rhimportd 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 rhimportd. If not, see <http://www.gnu.org/licenses/>.
//
package main
import (
"fmt"
"github.com/gorilla/websocket"
"helsinki.at/rhimport"
"html"
"math"
"net/http"
"time"
)
type webSocketRequestData struct {
Command string `json:"COMMAND"`
Id string `json:"ID"`
UserName string `json:"LOGIN_NAME"`
Password string `json:"PASSWORD"`
ShowId uint `json:"SHOW_ID"`
ClearShowCarts bool `json:"CLEAR_SHOW_CARTS"`
MusicPoolGroup string `json:"MUSIC_POOL_GROUP"`
Cart uint `json:"CART_NUMBER"`
ClearCart bool `json:"CLEAR_CART"`
Cut uint `json:"CUT_NUMBER"`
Channels uint `json:"CHANNELS"`
NormalizationLevel int `json:"NORMALIZATION_LEVEL"`
AutotrimLevel int `json:"AUTOTRIM_LEVEL"`
UseMetaData bool `json:"USE_METADATA"`
SourceUri string `json:"SOURCE_URI"`
Timeout uint `json:"TIMEOUT"`
}
func newWebSocketRequestData(conf *rhimport.Config) *webSocketRequestData {
rd := new(webSocketRequestData)
rd.Command = ""
rd.Id = ""
rd.UserName = ""
rd.Password = ""
rd.ShowId = 0
rd.ClearShowCarts = false
rd.MusicPoolGroup = ""
rd.Cart = 0
rd.ClearCart = false
rd.Cut = 0
rd.Channels = conf.ImportParamDefaults.Channels
rd.NormalizationLevel = conf.ImportParamDefaults.NormalizationLevel
rd.AutotrimLevel = conf.ImportParamDefaults.AutotrimLevel
rd.UseMetaData = conf.ImportParamDefaults.UseMetaData
rd.SourceUri = ""
rd.Timeout = 0
return rd
}
type webSocketResponseData struct {
ResponseCode int `json:"RESPONSE_CODE"`
Type string `json:"TYPE"`
ErrorString string `json:"ERROR_STRING"`
Id string `json:"ID"`
ProgressStep int `json:"PROGRESS_STEP"`
ProgressStepName string `json:"PROGRESS_STEP_NAME"`
Progress float64 `json:"PROGRESS"`
Cart uint `json:"CART_NUMBER"`
Cut uint `json:"CUT_NUMBER"`
}
func sendWebSocketResponse(ws *websocket.Conn, rd *webSocketResponseData) {
if err := ws.WriteJSON(*rd); err != nil {
rhdl.Println("WebScoket Client", ws.RemoteAddr(), "write error:", err)
}
}
func sendWebSocketErrorResponse(ws *websocket.Conn, id string, code int, err_str string) {
sendWebSocketResponse(ws, &webSocketResponseData{ResponseCode: code, Type: "ERROR", ErrorString: err_str, Id: id})
}
type webSocketSession struct {
id string
session *rhimport.SessionChan
respchan chan webSocketResponseData
donechan chan rhimport.ImportResult
}
func newWebSocketSession() *webSocketSession {
session := &webSocketSession{}
session.respchan = make(chan webSocketResponseData, 10)
session.donechan = make(chan rhimport.ImportResult, 1)
return session
}
func webSocketProgress(step int, step_name string, progress float64, userdata interface{}) bool {
if math.IsNaN(progress) {
progress = 0.0
}
session := userdata.(*webSocketSession)
select {
case session.respchan <- webSocketResponseData{http.StatusOK, "PROGRESS", "", session.id, step, step_name, progress * 100, 0, 0}:
default:
}
return true
}
func webSocketDone(res rhimport.ImportResult, userdata interface{}) bool {
session := userdata.(*webSocketSession)
session.donechan <- res
return true
}
func (self *webSocketSession) startNewSession(reqdata *webSocketRequestData, conf *rhimport.Config, rddb *rhimport.RdDbChan, sessions *rhimport.SessionStoreChan) (int, string) {
ctx := rhimport.NewImportContext(conf, rddb, reqdata.UserName)
ctx.Password = reqdata.Password
ctx.Trusted = true // set this to false as soon as the interface is working
ctx.ShowId = reqdata.ShowId
ctx.ClearShowCarts = reqdata.ClearShowCarts
ctx.GroupName = reqdata.MusicPoolGroup
ctx.Cart = reqdata.Cart
ctx.ClearCart = reqdata.ClearCart
ctx.Cut = reqdata.Cut
ctx.Channels = reqdata.Channels
ctx.NormalizationLevel = reqdata.NormalizationLevel
ctx.AutotrimLevel = reqdata.AutotrimLevel
ctx.UseMetaData = reqdata.UseMetaData
ctx.SourceUri = reqdata.SourceUri
id, s, code, errstring := sessions.New(ctx)
if code != http.StatusOK {
return code, errstring
}
self.id = id
self.session = s
if err := s.AddDoneHandler(self, webSocketDone); err != nil {
return http.StatusInternalServerError, err.Error()
}
if err := s.AddProgressHandler(self, webSocketProgress); err != nil {
return http.StatusInternalServerError, err.Error()
}
s.Run(time.Duration(reqdata.Timeout) * time.Second)
return http.StatusOK, "SUCCESS"
}
func webSocketSessionHandler(reqchan <-chan webSocketRequestData, ws *websocket.Conn, conf *rhimport.Config, rddb *rhimport.RdDbChan, sessions *rhimport.SessionStoreChan) {
defer ws.Close()
session := newWebSocketSession()
for {
select {
case reqdata, ok := <-reqchan:
if !ok {
return
}
switch reqdata.Command {
case "new":
if session.id != "" {
sendWebSocketErrorResponse(ws, "", http.StatusBadRequest, "This connection already handles a session")
return
}
code, errstring := session.startNewSession(&reqdata, conf, rddb, sessions)
if code != http.StatusOK {
sendWebSocketErrorResponse(ws, "", code, errstring)
return
} else {
sendWebSocketResponse(ws, &webSocketResponseData{ResponseCode: code, Type: "ACK", Id: session.id})
}
case "cancel":
if session.id == "" {
sendWebSocketErrorResponse(ws, "", http.StatusBadRequest, "This connection doesn't handle any session")
return
}
session.session.Cancel()
case "reconnect":
if session.id != "" {
sendWebSocketErrorResponse(ws, "", http.StatusBadRequest, "This connection already handles a session")
return
}
sendWebSocketErrorResponse(ws, "", http.StatusNotImplemented, "reconnect session - not yet implemented")
return
default:
sendWebSocketErrorResponse(ws, "", http.StatusBadRequest, fmt.Sprintf("unknown command '%s'", reqdata.Command))
return
}
case respdata := <-session.respchan:
sendWebSocketResponse(ws, &respdata)
case donedata := <-session.donechan:
sendWebSocketResponse(ws, &webSocketResponseData{donedata.ResponseCode, "DONE", donedata.ErrorString, session.id, 0, "", 100.0, donedata.Cart, donedata.Cut})
// TODO: send close message at this point?
}
}
}
func webSocketHandler(conf *rhimport.Config, rddb *rhimport.RdDbChan, sessions *rhimport.SessionStoreChan, trusted bool, w http.ResponseWriter, r *http.Request) {
rhdl.Printf("WebSocketHandler: request for '%s'", html.EscapeString(r.URL.Path))
ws, err := websocket.Upgrade(w, r, nil, 1024, 1024)
if _, ok := err.(websocket.HandshakeError); ok {
http.Error(w, "Not a websocket handshake", 400)
return
} else if err != nil {
rhdl.Println("WebSocket Client", ws.RemoteAddr(), "error:", err)
return
}
rhdl.Println("WebSocket Client", ws.RemoteAddr(), "connected")
reqchan := make(chan webSocketRequestData)
go webSocketSessionHandler(reqchan, ws, conf, rddb, sessions)
defer close(reqchan)
for {
reqdata := newWebSocketRequestData(conf)
if err := ws.ReadJSON(&reqdata); err != nil {
rhdl.Println("WebSocket Client", ws.RemoteAddr(), "disconnected:", err)
return
} else {
// rhdl.Printf("Websocket Client %s got: %+v", ws.RemoteAddr(), reqdata)
reqchan <- *reqdata
}
}
return
}
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