3eb933400a
there are some cases that may lead to inconsistencies. Currently, only the master-slave method is a reliable sync method
342 lines
9.4 KiB
JavaScript
342 lines
9.4 KiB
JavaScript
module.exports = {
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init: function(options) {
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var req;
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req = (function(_this) {
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return function(name, choices) {
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if (options[name] != null) {
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if ((choices == null) || choices.some(function(c) {
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return c === options[name];
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})) {
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return _this[name] = options[name];
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} else {
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throw new Error("You can set the '" + name + "' option to one of the following choices: " + JSON.encode(choices));
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}
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} else {
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throw new Error("You must specify " + name + ", when initializing the Connector!");
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}
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};
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})(this);
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req("syncMode", ["syncAll", "master-slave"]);
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req("role", ["master", "slave"]);
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req("user_id");
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this.on_user_id_set(this.user_id);
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if (this.role === "master") {
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this.syncMode = "syncAll";
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}
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this.is_synced = false;
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this.connections = {};
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this.is_bound_to_y = false;
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this.connections = {};
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this.current_sync_target = null;
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return this.sent_hb_to_all_users = false;
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},
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isRoleMaster: function() {
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return this.role === "master";
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},
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isRoleSlave: function() {
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return this.role === "slave";
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},
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findNewSyncTarget: function() {
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var c, user, _ref;
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this.current_sync_target = null;
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if (this.syncMode === "syncAll") {
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_ref = this.connections;
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for (user in _ref) {
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c = _ref[user];
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if (!c.is_synced) {
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this.performSync(user);
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break;
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}
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}
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}
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if (this.current_sync_target == null) {
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this.setStateSynced();
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}
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return null;
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},
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userLeft: function(user) {
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delete this.connections[user];
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return this.findNewSyncTarget();
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},
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userJoined: function(user, role) {
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if (role == null) {
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throw new Error("Internal: You must specify the role of the joined user! E.g. userJoined('uid:3939','slave')");
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}
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this.connections[user] = {
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is_synced: false
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};
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if ((!this.is_synced) || this.syncMode === "syncAll") {
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if (this.syncMode === "syncAll") {
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return this.performSync(user);
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} else if (role === "master") {
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return this.performSyncWithMaster(user);
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}
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}
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},
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whenSynced: function(args) {
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if (args.constructore === Function) {
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args = [args];
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}
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if (this.is_synced) {
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return args[0].apply(this, args.slice(1));
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} else {
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if (this.compute_when_synced == null) {
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this.compute_when_synced = [];
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}
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return this.compute_when_synced.push(args);
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}
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},
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onReceive: function(f) {
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return this.receive_handlers.push(f);
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},
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/*
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* Broadcast a message to all connected peers.
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* @param message {Object} The message to broadcast.
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*
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broadcast: (message)->
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throw new Error "You must implement broadcast!"
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*
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* Send a message to a peer, or set of peers
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*
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send: (peer_s, message)->
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throw new Error "You must implement send!"
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*/
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performSync: function(user) {
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var hb, o, _hb, _i, _len;
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if (this.current_sync_target == null) {
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this.current_sync_target = user;
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this.send(user, {
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sync_step: "getHB",
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send_again: "true",
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data: []
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});
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if (!this.sent_hb_to_all_users) {
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this.sent_hb_to_all_users = true;
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hb = this.getHB([]).hb;
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_hb = [];
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for (_i = 0, _len = hb.length; _i < _len; _i++) {
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o = hb[_i];
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_hb.push(o);
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if (_hb.length > 30) {
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this.broadcast({
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sync_step: "applyHB_",
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data: _hb
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});
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_hb = [];
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}
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}
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return this.broadcast({
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sync_step: "applyHB",
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data: _hb
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});
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}
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}
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},
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performSyncWithMaster: function(user) {
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var hb, o, _hb, _i, _len;
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this.current_sync_target = user;
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this.send(user, {
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sync_step: "getHB",
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send_again: "true",
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data: []
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});
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hb = this.getHB([]).hb;
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_hb = [];
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for (_i = 0, _len = hb.length; _i < _len; _i++) {
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o = hb[_i];
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_hb.push(o);
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if (_hb.length > 30) {
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this.broadcast({
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sync_step: "applyHB_",
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data: _hb
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});
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_hb = [];
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}
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}
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return this.broadcast({
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sync_step: "applyHB",
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data: _hb
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});
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},
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setStateSynced: function() {
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var f, _i, _len, _ref;
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if (!this.is_synced) {
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this.is_synced = true;
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_ref = this.compute_when_synced;
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for (_i = 0, _len = _ref.length; _i < _len; _i++) {
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f = _ref[_i];
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f();
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}
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delete this.compute_when_synced;
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return null;
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}
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},
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receiveMessage: function(sender, res) {
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var data, f, hb, o, sendApplyHB, send_again, _hb, _i, _j, _len, _len1, _ref, _results;
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if (res.sync_step == null) {
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_ref = this.receive_handlers;
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_results = [];
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for (_i = 0, _len = _ref.length; _i < _len; _i++) {
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f = _ref[_i];
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_results.push(f(sender, res));
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}
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return _results;
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} else {
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if (sender === this.user_id) {
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return;
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}
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if (res.sync_step === "getHB") {
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data = this.getHB(res.data);
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hb = data.hb;
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_hb = [];
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if (this.is_synced) {
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sendApplyHB = (function(_this) {
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return function(m) {
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return _this.send(sender, m);
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};
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})(this);
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} else {
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sendApplyHB = (function(_this) {
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return function(m) {
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return _this.broadcast(m);
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};
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})(this);
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}
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for (_j = 0, _len1 = hb.length; _j < _len1; _j++) {
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o = hb[_j];
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_hb.push(o);
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if (_hb.length > 30) {
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sendApplyHB({
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sync_step: "applyHB_",
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data: _hb
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});
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_hb = [];
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}
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}
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sendApplyHB({
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sync_step: "applyHB",
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data: _hb
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});
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if (res.send_again != null) {
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send_again = (function(_this) {
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return function(sv) {
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return function() {
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hb = _this.getHB(sv).hb;
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return _this.send(sender, {
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sync_step: "applyHB",
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data: hb,
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sent_again: "true"
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});
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};
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};
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})(this)(data.state_vector);
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return setTimeout(send_again, 3000);
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}
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} else if (res.sync_step === "applyHB") {
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this.applyHB(res.data, sender === this.current_sync_target);
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if ((this.syncMode === "syncAll" || (res.sent_again != null)) && (!this.is_synced) && (this.current_sync_target === sender)) {
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this.connections[sender].is_synced = true;
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return this.findNewSyncTarget();
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}
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} else if (res.sync_step === "applyHB_") {
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return this.applyHB(res.data, sender === this.current_sync_target);
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}
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}
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},
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parseMessageFromXml: function(m) {
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var parse_array, parse_object;
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parse_array = function(node) {
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var n, _i, _len, _ref, _results;
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_ref = node.children;
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_results = [];
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for (_i = 0, _len = _ref.length; _i < _len; _i++) {
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n = _ref[_i];
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if (n.getAttribute("isArray") === "true") {
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_results.push(parse_array(n));
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} else {
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_results.push(parse_object(n));
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}
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}
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return _results;
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};
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parse_object = function(node) {
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var int, json, n, name, value, _i, _len, _ref, _ref1;
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json = {};
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_ref = node.attrs;
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for (name in _ref) {
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value = _ref[name];
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int = parseInt(value);
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if (isNaN(int) || ("" + int) !== value) {
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json[name] = value;
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} else {
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json[name] = int;
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}
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}
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_ref1 = node.children;
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for (_i = 0, _len = _ref1.length; _i < _len; _i++) {
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n = _ref1[_i];
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name = n.name;
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if (n.getAttribute("isArray") === "true") {
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json[name] = parse_array(n);
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} else {
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json[name] = parse_object(n);
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}
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}
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return json;
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};
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return parse_object(m);
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},
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encodeMessageToXml: function(m, json) {
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var encode_array, encode_object;
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encode_object = function(m, json) {
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var name, value;
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for (name in json) {
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value = json[name];
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if (value == null) {
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} else if (value.constructor === Object) {
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encode_object(m.c(name), value);
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} else if (value.constructor === Array) {
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encode_array(m.c(name), value);
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} else {
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m.setAttribute(name, value);
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}
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}
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return m;
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};
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encode_array = function(m, array) {
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var e, _i, _len;
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m.setAttribute("isArray", "true");
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for (_i = 0, _len = array.length; _i < _len; _i++) {
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e = array[_i];
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if (e.constructor === Object) {
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encode_object(m.c("array-element"), e);
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} else {
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encode_array(m.c("array-element"), e);
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}
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}
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return m;
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};
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if (json.constructor === Object) {
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return encode_object(m.c("y", {
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xmlns: "http://y.ninja/connector-stanza"
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}), json);
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} else if (json.constructor === Array) {
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return encode_array(m.c("y", {
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xmlns: "http://y.ninja/connector-stanza"
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}), json);
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} else {
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throw new Error("I can't encode this json!");
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}
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},
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setIsBoundToY: function() {
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if (typeof this.on_bound_to_y === "function") {
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this.on_bound_to_y();
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}
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delete this.when_bound_to_y;
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return this.is_bound_to_y = true;
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}
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};
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