jsonrpc.js file && batch polling

lib/httpsync.js

@@ -38,7 +38,8 @@ HttpSyncProvider.prototype.send = function (payload) {
     request.send(JSON.stringify(payload));
     
     // check request.status
-    return request.responseText;
+    var result = request.responseText;
+    return JSON.parse(result);
 };
 
 module.exports = HttpSyncProvider;

lib/jsonrpc.js

@@ -0,0 +1,61 @@
+/*
+    This file is part of ethereum.js.
+
+    ethereum.js 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 3 of the License, or
+    (at your option) any later version.
+
+    ethereum.js 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 ethereum.js.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file jsonrpc.js
+ * @authors:
+ *   Marek Kotewicz <marek@ethdev.com>
+ * @date 2015
+ */
+
+var messageId = 1;
+
+/// Should be called to valid json create payload object
+/// @param method of jsonrpc call, required
+/// @param params, an array of method params, optional
+/// @returns valid jsonrpc payload object
+var toPayload = function (method, params) {
+    if (!method)
+        console.error('jsonrpc method should be specified!');
+
+    return {
+        jsonrpc: '2.0',
+        method: method,
+        params: params || [],
+        id: messageId++
+    }; 
+};
+
+/// Should be called to check if jsonrpc response is valid
+/// @returns true if response doesn't have error field
+var isValidResponse = function (response) {
+    return response && !response.error;
+};
+
+/// Should be called to create batch payload object
+/// @param messages, an array of objects with method (required) and params (optional) fields
+var toBatchPayload = function (messages) {
+    return messages.map(function (message) {
+        return toPayload(message.method, message.params);
+    }); 
+};
+
+module.exports = {
+    toPayload: toPayload,
+    isValidResponse: isValidResponse,
+    toBatchPayload: toBatchPayload
+};
+
+

lib/providermanager.js

@@ -23,7 +23,9 @@
  * @date 2014
  */
 
-var web3 = require('./web3'); // jshint ignore:line
+var web3 = require('./web3'); 
+var jsonrpc = require('./jsonrpc');
+
 
 /**
  * Provider manager object prototype
@@ -37,21 +39,34 @@ var web3 = require('./web3'); // jshint ignore:line
 var ProviderManager = function() {
     this.polls = [];
     this.provider = undefined;
-    this.id = 1;
 
     var self = this;
     var poll = function () {
         if (self.provider) {
-            self.polls.forEach(function (data) {
-                var result = self.send(data.data);
-            
+            var pollsBatch = self.polls.map(function (data) {
+                return data.data;
+            });
+
+            var payload = jsonrpc.toBatchPayload(pollsBatch);
+            var results = self.provider.send(payload);
+
+            self.polls.forEach(function (data, index) {
+                var result = results[index];
+                
+                if (!jsonrpc.isValidResponse(result)) {
+                    return;
+                }
+
+                result = result.result;
                 // dont call the callback if result is not an array, or empty one
                 if (!(result instanceof Array) || result.length === 0) {
                     return;
                 }
 
                 data.callback(result);
+
             });
+
         }
         setTimeout(poll, 1000);
     };
@@ -61,21 +76,16 @@ var ProviderManager = function() {
 /// sends outgoing requests
 /// @params data - an object with at least 'method' property
 ProviderManager.prototype.send = function(data) {
-
-    data.jsonrpc = '2.0';
-    data.params = data.params || [];
-    data.id = this.id++;
+    var payload = jsonrpc.toPayload(data.method, data.params);
 
     if (this.provider === undefined) {
         console.error('provider is not set');
         return null; 
     }
 
-    //TODO: handle error here? 
-    var result = this.provider.send(data);
-    result = JSON.parse(result);
+    var result = this.provider.send(payload);
 
-    if (result.error) {
+    if (!jsonrpc.isValidResponse(result)) {
         console.log(result.error);
         return null;
     }

lib/qtsync.js

@@ -25,7 +25,8 @@ var QtSyncProvider = function () {
 };
 
 QtSyncProvider.prototype.send = function (payload) {
-    return navigator.qt.callMethod(JSON.stringify(payload));
+    var result = navigator.qt.callMethod(JSON.stringify(payload));
+    return JSON.parse(result);
 };
 
 module.exports = QtSyncProvider;