egroupware/phpgwapi/js/jsolait/lib/jsonrpc.js

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/*
Copyright (c) 2003-2004 Jan-Klaas Kollhof
This file is part of the JavaScript o lait library(jsolait).
jsolait is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This software 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this software; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
Provides an JSON-RPC imlementation.
*/
Module("jsonrpc", "0.3.2", function(mod){
var lang = importModule("lang");
var tokens = lang.tokens;
var ObjectBuffer=Class("ObjectBuffer", function(publ, supr){
publ.init=function(){
this.data="";
}
publ.getObjects=function(data){
this.data += data;
var t = new lang.Tokenizer(this.data);
var brCnt= 0;
var objects = [];
var readCnt = 0
while(! t.finished()){
var n = t.next();
if(n.type != tokens.ERR){
if(n.value == "{"){
brCnt+=1;
}else if(n.value == "}"){
brCnt-=1;
if(brCnt==0){
var s = this.data.slice(readCnt, n.pos+1);
readCnt += s.length;
objects.push(s);
}
}
}else{
break;
}
}
this.data = this.data.slice(readCnt);
return objects;
}
})
var nameAllowed=function(name){
return name.match(/^[a-zA-Z]\w*$/) != null;
}
var getMethodByName=function(obj, name){
try{//to get a method by asking the service
obj = obj._getMethodByName(name)
}catch(e){
var names = name.split(".");
for(var i=0;i<names.length;i++){
name = names[i];
if(nameAllowed(name)){
obj = obj[name];
}
}
}
return obj;
}
var Response=Class("Response", function(publ, supr){
publ.init=function(id, result, error){
this.id=id;
this.result = result;
this.error = error;
}
publ._toJSON=function(){
var p = [lang.objToJson(this.id), lang.objToJson(this.result),lang.objToJson(this.error)];
return '{"id":' + p[0] + ', "result":' + p[1] + ', "error":' + p[2] + "}";
}
})
var Request=Class("Request", function(publ, supr){
publ.init=function(id, method, params){
this.id=id;
this.method = method;
this.params = params;
}
publ._toJSON=function(){
var p = [lang.objToJson(this.id), lang.objToJson(this.method),lang.objToJson(this.params)];
return '{"id":' + p[0] + ', "method":' + p[1] + ', "params":' + p[2] + "}";
}
})
var Notification=Class("Notification", function(publ, supr){
publ.init=function(method, params){
this.method = method;
this.params = params;
}
publ._toJSON=function(){
var p = [lang.objToJson(this.method),lang.objToJson(this.params)];
return '{"method":' + p[0] + ', "params":' + p[1] + "}";
}
})
var ResponseHandler=Class("ResponseHandler", function(publ, supr){
publ.init=function(callback){
this.callback=callback;
}
publ.handleResponse=function(resp){
this.callback(resp.result, resp.error);
}
})
var RPCLib = Class("RPCLib", function(publ, supr){
})
var BaseConnectionHandler = Class("BaseConnectionHandler", function(publ, supr){
publ.init=function(service){
this.service = service;
this.jsonParser = new lang.JSONParser();
this.jsonParser.addLib(new RPCLib(), "rpc", []);
this.respHandlers = [];
this.objBuffer = new ObjectBuffer();
}
publ.addResponseHandler=function(cb){
var id=1;
while(this.respHandlers[""+id] ){
id+=1;
}
id="" + id;
this.respHandlers[id] = new ResponseHandler(cb);
return id;
}
publ.send = function(data){
}
publ.sendNotify = function(name, args){
var n = new Notification(name, args);
n = this.jsonParser.objToJson(n);
this.send(n)
}
publ.sendRequest = function(name, args, callback){
var id = this.addResponseHandler(callback);
var r = new Request(id, name, args);
r = this.jsonParser.objToJson(r);
this.send(r);
}
publ.sendResponse = function(id, result, error){
var r = new Response(id, result, error);
r = this.jsonParser.objToJson(r);
this.send(r);
}
publ.handleRequest = function(req){
var name = req.method;
var params = req.params;
var id=req.id;
if(this.service[name]){
try{
var rslt = this.service[name].apply(this.service,params);
this.sendResponse(id, rslt, null)
}catch(e){
this.sendResponse(id, null, new ApplicationError("" + e))
}
}else{
this.sendResponse(id, null, new MethodNotFound());
}
}
publ.handleNotification = function(notif){
if(this.service[notif.method]){
try{
this.service[notif.method].apply(this.service, notif.params);
}catch(e){
}
}
}
publ.handleResponse = function(resp){
var id=resp.id;
var h = this.respHandlers[id];
h.handleResponse(resp)
delete this.respHandlers[id]
}
publ.handleData = function(data){
var objs = this.objBuffer.getObjects(data);
for(var i=0;i<objs.length;i++){
try{
var obj = this.jsonParser.jsonToObj(objs[i]);
}catch(e){
throw "Not well formed";
}
if(obj.method != null){
if(obj.id != null){
this.handleRequest(new Request(obj.id, obj.method, obj.params));
}else{
this.handleNotification(new Notification(obj.method, obj.params));
}
}else if(obj.id != null){
this.handleResponse(new Response(obj.id, obj.result, obj.error));
}else{
throw "Unknown Data";
}
}
}
})
var SocketConnectionHandler = Class("SocketConnectionHandler", BaseConnectionHandler, function(publ, supr){
publ.init=function(socket, localService){
this.socket = socket;
socket.addEventListener("connectionData", this, false);
supr(this).init( localService);
}
publ.handleEvent=function(evt){
this.handleData(evt.data);
}
publ.send=function(data){
this.socket.send(data);
}
publ.close=function(data){
this.socket.close();
}
})
var HTTPConnectionHandler = Class("HTTPConnectionHandler", BaseConnectionHandler, function(publ, supr){
var urllib;
publ.init=function(url, localService){
urllib=importModule("urllib");
this.url = url;
supr(this).init( localService);
}
publ.handleData = function(data){
try{
var obj = this.jsonParser.jsonToObj(data);
}catch(e){
throw "Not well formed";
}
if(obj.id != null){
return obj;
}else{
throw "Unknown Data (No id property found)";
}
}
publ.sendRequest = function(name, args, callback){
var sync = false;
if(typeof callback != "function"){//see if it is sync
args.push(callback);
sync=true;
}
var data = new Request("httpReq", name, args);
data = this.jsonParser.objToJson(data);
if(sync){
var rsp = urllib.postURL(this.url, data, [["Content-Type", "text/plain"]]);
rsp = this.handleData(rsp.responseText);
if(rsp.error){
throw rsp.error;
}else{
return rsp.result;
}
}else{//async connection uses the respHandler to handle the repsonse
var self = this;
urllib.postURL(this.url, data, [["Content-Type", "text/plain"]], function(rsp){
try{
rsp = self.handleData(rsp.responseText);
}catch(e){
callback(null,e);
return;
}
callback(rsp.result, rsp.error);
});
}
}
publ.sendNotify = function(name, args){
var data = new Notification(name, args);
data = this.jsonParser.objToJson(data);
urllib.postURL(this.url, data, [["Content-Type", "text/plain"]], function(rsp){});
}
})
var PeerObject=Class("PeerObject", function(publ, supr){
publ.init=function(name, conn){
var fn=function(){
var args=[];
for(var i=0;i<arguments.length;i++){
args[i] = arguments[i];
}
var cb=args.pop();
return conn.sendRequest(name, args, cb);
}
return fn;
}
})
var PeerNotifyObject=Class("PeerNotifyObject", function(publ, supr){
publ.init=function(name, conn){
var fn=function(){
var args=[];
for(var i=0;i<arguments.length;i++){
args[i] = arguments[i];
}
conn.sendNotify(name, args);
}
return fn;
}
})
var BasePeer = Class("BasePeer", function(publ, supr){
publ.init=function(conn, methodNames){
this._conn = conn;
this.notify = new PeerObject("notify", conn);
this._add(methodNames);
}
var setupPeerMethod=function(root, methodName, conn, MethClass){
var names = methodName.split(".");
var obj = root;
for(var n=0;n<names.length-1;n++){
var name = names[n];
if(obj[name]){
obj = obj[name];
}else{
obj[name] = new Object();
obj = obj[name];
}
}
var name = names[names.length-1];
if(obj[name]){
}else{
var mth = new MethClass(methodName, conn);
obj[name] = mth;
}
}
publ._add = function(methodNames){
for(var i=0;i<methodNames.length;i++){
setupPeerMethod(this, methodNames[i], this._conn, PeerObject);
setupPeerMethod(this.notify, methodNames[i], this._conn, PeerNotifyObject);
}
}
})
mod.ServiceProxy = Class("ServiceProxy", BasePeer, function(publ, supr){
publ.init = function(url, methodNames, localService){
var n = url.match(/^jsonrpc:\/\/(.*:\d*)$/);
if(n!=null){//is it json-rpc over TCP protocoll
var hostaddr = n[1];
try{
var socket = createConnection();
}catch(e){
throw "Can't create a socket connection."
}
socket.connect(hostaddr);
supr(this).init( new SocketConnectionHandler(socket, localService), methodNames);
}else{//or is it json-rpc over http
supr(this).init( new HTTPConnectionHandler(url, localService), methodNames);
}
}
})
})