1 files changed, 94 insertions, 0 deletions
diff --git a/lib/httprpc.js b/lib/httprpc.js
new file mode 100644
index 000000000..99f02b532
--- /dev/null
+++ b/lib/httprpc.js
@@ -0,0 +1,94 @@
+/*
+    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 httprpc.js
+ * @authors:
+ *   Marek Kotewicz <marek@ethdev.com>
+ *   Marian Oancea <marian@ethdev.com>
+ * @date 2014
+ */
+
+if(process.env.NODE_ENV !== "build") {
+    var XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest; // jshint ignore:line
+}
+
+
+    var HttpRpcProvider = function (host) {
+        this.handlers = [];
+        this.host = host;
+    };
+
+    function formatJsonRpcObject(object) {
+        return {
+            jsonrpc: '2.0',
+            method: object.call,
+            params: object.args,
+            id: object._id
+        };
+    }
+
+    function formatJsonRpcMessage(message) {
+        var object = JSON.parse(message);
+
+        return {
+            _id: object.id,
+            data: object.result,
+            error: object.error
+        };
+    }
+
+    HttpRpcProvider.prototype.sendRequest = function (payload, cb) {
+        var data = formatJsonRpcObject(payload);
+
+        var request = new XMLHttpRequest();
+        request.open("POST", this.host, true);
+        request.send(JSON.stringify(data));
+        request.onreadystatechange = function () {
+            if (request.readyState === 4 && cb) {
+                cb(request);
+            }
+        };
+    };
+
+    HttpRpcProvider.prototype.send = function (payload) {
+        var self = this;
+        this.sendRequest(payload, function (request) {
+            self.handlers.forEach(function (handler) {
+                handler.call(self, formatJsonRpcMessage(request.responseText));
+            });
+        });
+    };
+
+    HttpRpcProvider.prototype.poll = function (payload, id) {
+        var self = this;
+        this.sendRequest(payload, function (request) {
+            var parsed = JSON.parse(request.responseText);
+            if (parsed.error || (parsed.result instanceof Array ? parsed.result.length === 0 : !parsed.result)) {
+                return;
+            }
+            self.handlers.forEach(function (handler) {
+                handler.call(self, {_event: payload.call, _id: id, data: parsed.result});
+            });
+        });
+    };
+
+    Object.defineProperty(HttpRpcProvider.prototype, "onmessage", {
+        set: function (handler) {
+            this.handlers.push(handler);
+        }
+    });
+
+module.exports = HttpRpcProvider;