From 0f29df40b3c2ea641b4dff1f17e9a15a1a45d211 Mon Sep 17 00:00:00 2001
From: Max Jonas Werner <mail@makk.es>
Date: Tue, 16 Sep 2014 01:05:25 +0200
Subject: [PATCH] refs #4 Add Chord implementation

* Fixed message routing
* Added error message type
* Removed unused 'to' parameter from Chord messages
---
 js/chord/chord.js  |  6 ++++--
 js/chord/node.js   | 26 +++++++++++++++-----------
 js/chord/server.js |  4 ++--
 js/chord/test.js   |  9 ++++++++-
 4 files changed, 29 insertions(+), 16 deletions(-)

diff --git a/js/chord/chord.js b/js/chord/chord.js
index 957d01a..5bceada 100644
--- a/js/chord/chord.js
+++ b/js/chord/chord.js
@@ -227,12 +227,14 @@ Chord.prototype.remove = function(key) {
 
 Chord.prototype.route = function(to, type, payload, callback) {
     if (to === "*") {
-        this._localNode.route(to, type, payload);
+        this._localNode.route(to, type, payload, callback);
     } else if (this.id().equals(to)) {
         callback(null);
+    } else if (Range.inOpenInterval(to, this._localNode.predecessor_id(), this.id())) {
+        callback("No peer found with with ID " + to.toString());
     } else {
         this._localNode.successor(function(err, successorNode) {
-            successorNode.route(to, type, payload);
+            successorNode.route(to, type, payload, callback);
         });
     }
 };
diff --git a/js/chord/node.js b/js/chord/node.js
index b7cdb67..40ab753 100644
--- a/js/chord/node.js
+++ b/js/chord/node.js
@@ -39,7 +39,9 @@ ChordNode.prototype = {
         UPDATE_SUCCESSOR: "UPDATE_SUCCESSOR",
         ACK: "ACK",
         PUT: "PUT",
-        GET: "GET"
+        GET: "GET",
+        ROUTE: "ROUTE",
+        ERROR: "ERROR"
     },
 
     toString: function() {
@@ -151,15 +153,15 @@ ChordNode.prototype = {
         });
     },
 
-    route: function(to, type, payload) {
+    route: function(to, type, payload, callback) {
         var self = this;
         this._send_request({
             type: this.message_types.ROUTE,
-            to: to,
+            to: to.toString(),
             proto_type: type,
             payload: payload
         }, function(err, msg) {
-            self.log("route result", msg);
+            callback(err);
         });
     },
 
@@ -258,11 +260,16 @@ ChordNode.prototype = {
 
     _route: function(msg) {
         var self = this;
-        this._chord.route(msg.to, msg.proto_type, msg.payload, function(err) {
-            self._send({
+        this._chord.route(new BigInteger(msg.to), msg.proto_type, msg.payload, function(err) {
+            var resp = {
                 type: self.message_types.ACK,
                 seqnr: msg.seqnr
-            });
+            };
+            if (err) {
+                resp.type = self.message_types.ERROR;
+                resp.error = err;
+            }
+            self._send(resp);
         });
     },
 
@@ -273,9 +280,6 @@ ChordNode.prototype = {
     },
 
     _send: function(msg) {
-        if (!this._localNode) {
-            msg.to = this._peer.id.toString();
-        }
         msg.from = this._chord.id().toString();
         this._peer.dataChannel.send(JSON.stringify(msg));
     },
@@ -294,7 +298,7 @@ ChordNode.prototype = {
 
     _handle_response: function(msg, callback) {
         delete this._pending[msg.seqnr];
-        callback(null, msg);
+        callback(msg.error, msg);
     },
 
     _handle_request: function(msg) {
diff --git a/js/chord/server.js b/js/chord/server.js
index 2cd2e3d..549edaa 100644
--- a/js/chord/server.js
+++ b/js/chord/server.js
@@ -29,7 +29,7 @@ Server.prototype.connect = function(to, callback) {
             var onmessage = local.dataChannel.onmessage;
             if (typeof(onmessage) === "function") {
                 onmessage.apply(local.dataChannel, [{
-                        data: JSON.stringify(msg)
+                        data: msg
                     },
                     self.id
                 ]);
@@ -41,7 +41,7 @@ Server.prototype.connect = function(to, callback) {
             var onmessage = remote.dataChannel.onmessage;
             if (typeof(onmessage) === "function") {
                 onmessage.apply(remote.dataChannel, [{
-                        data: JSON.stringify(msg)
+                        data: msg
                     },
                     to
                 ]);
diff --git a/js/chord/test.js b/js/chord/test.js
index 2d21fb9..c72b412 100644
--- a/js/chord/test.js
+++ b/js/chord/test.js
@@ -62,9 +62,16 @@ function debug(chord, id, bootstrapId, err, res) {
                 console.log("//{" + k + ": " + v + "}");
             });
         });
-        chords[9].route(chords[3].id(), "test", {
+        var to = chords[3].id();
+        chords[9].route(to, "test", {
             a: 1,
             b: 2
+        }, function(err) {
+            if (err) {
+                console.log("Error routing to", to.toString(), err);
+            } else {
+                console.log("routing successful");
+            }
         });
     }
 }