http provider

1 files changed, 52 insertions, 0 deletions

diff --git a/http.js b/http.js
new file mode 100644
index 000000000..88869c689
--- /dev/null
+++ b/http.js
@@ -0,0 +1,52 @@
+(function () {
+    var HttpProvider = function (host) {
+        this.handlers = [];
+        this.host = host;
+    };
+
+    //TODO unify the format of object passed to 'send method'
+    function formatJsonRpcObject(object) {
+        return {
+            jsonrpc: '2.0',
+            method: object.call,
+            params: object.args,
+            id: object._id
+        }
+    };
+
+    //TODO unify the format of output messages, maybe there should be objects instead
+    function formatJsonRpcMessage(message) {    
+        var object = JSON.parse(message);
+       
+        return JSON.stringify({
+            _id: object.id,
+            data: object.result
+        });
+    };
+
+    HttpProvider.prototype.send = function (payload) {
+        var data = formatJsonRpcObject(payload);
+
+        var request = new XMLHttpRequest();
+        request.open("POST", this.host, true);
+        request.send(JSON.stringify(data));
+        var self = this;
+        request.onreadystatechange = function () {
+            if (request.readyState === 4) {
+                self.handlers.forEach(function (handler) {
+                    handler.call(self, formatJsonRpcMessage(request.responseText));
+                });
+            }
+        }
+    };
+
+    Object.defineProperty(HttpProvider.prototype, "onmessage", {
+        set: function (handler) {
+            this.handlers.push(handler);
+        }
+    });
+
+    if (typeof(web3) !== "undefined" && web3.providers !== undefined) {
+        web3.providers.HttpProvider = HttpProvider;
+    }
+})();