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JS: Factored server-related logic out into separate Server class.

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This commit is contained in:
Stefan Thomas
2013-02-19 17:33:36 +01:00
parent 9a7a710334
commit decd020c59
3 changed files with 353 additions and 265 deletions
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8
src/js/account.js
View File

@@ -52,12 +52,8 @@ var Account = function (remote, account) {
}
});
this._remote.on('connect', function () {
if (self._subs) {
self._remote.request_subscribe()
.accounts(self._account_id)
.request();
}
this._remote.on('prepare_subscribe', function (request) {
if (self._subs) request.accounts(self._account_id);
});
this.on('transaction', function (msg) {

378
src/js/remote.js
View File

@@ -16,9 +16,10 @@
// npm
var EventEmitter = require('events').EventEmitter;
var Server = require('./server').Server;
var Amount = require('./amount').Amount;
var Currency = require('./amount').Currency;
var UInt160 = require('./amount').UInt160;
var Currency = require('./currency').Currency;
var UInt160 = require('./uint160').UInt160;
var Transaction = require('./transaction').Transaction;
var Account = require('./account').Account;
var Meta = require('./meta').Meta;
@@ -239,8 +240,10 @@ Request.prototype.books = function (books, snapshot) {
// Remote - access to a remote Ripple server via websocket.
//
// Events:
// 'connected'
// 'disconnected'
// 'connect'
// 'connected' (DEPRECATED)
// 'disconnect'
// 'disconnected' (DEPRECATED)
// 'state':
// - 'online' : Connected and subscribed.
// - 'offline' : Not subscribed or not connected.
@@ -284,7 +287,8 @@ var Remote = function (opts, trace) {
this._fee_base = undefined;
this._reserve_base = undefined;
this._reserve_inc = undefined;
this._server_status = undefined;
this._connection_count = 0;
this._last_tx = null;
// Local signing implies local fees and sequences
@@ -293,6 +297,8 @@ var Remote = function (opts, trace) {
this.local_fee = true;
}
this._servers = [];
// Cache information for accounts.
// DEPRECATED, will be removed
this.accounts = {
@@ -324,6 +330,12 @@ var Remote = function (opts, trace) {
}
};
// XXX Add support for multiple servers
var url = (this.websocket_ssl ? "wss://" : "ws://") +
this.websocket_ip + ":" + this.websocket_port;
this.add_server(new Server(this, {url: url}));
this.on('newListener', function (type, listener) {
if ('transaction_all' === type)
{
@@ -331,7 +343,6 @@ var Remote = function (opts, trace) {
{
self.request_subscribe([ 'transactions' ])
.request();
}
self._transaction_subs += 1;
}
@@ -381,17 +392,27 @@ var isTefFailure = function (engine_result_code) {
return (engine_result_code >= -299 && engine_result_code < 199);
};
/**
* Server states that we will treat as the server being online.
*
* Our requirements are that the server can process transactions and notify
* us of changes.
*/
Remote.online_states = [
'proposing',
'validating',
'full'
];
Remote.prototype.add_server = function (server) {
var self = this;
server.on('message', function (data) {
self._handle_message(data);
});
server.on('connect', function () {
self._connection_count++;
self._set_state('online');
});
server.on('disconnect', function () {
self._connection_count--;
if (!self._connection_count) self._set_state('offline');
});
this._servers.push(server);
return this;
};
// Inform remote that the remote server is not comming back.
Remote.prototype.server_fatal = function () {
@@ -429,25 +450,35 @@ Remote.prototype.set_trace = function (trace) {
return this;
};
// Set the target online state. Defaults to false.
/**
* Connect to the Ripple network.
*/
Remote.prototype.connect = function (online) {
var target = undefined === online || online;
if (this.online_target != target) {
this.online_target = target;
// If we were in a stable state, go dynamic.
switch (this._online_state) {
case 'open':
if (!target) this._connect_stop();
break;
case 'closed':
if (target) this._connect_retry();
break;
}
// Downwards compatibility
if ("undefined" !== typeof online && !online) {
return this.disconnect();
}
if (!this._servers.length) {
throw new Error("No servers available.");
} else {
// XXX Add support for multiple servers
this._servers[0].connect();
}
return this;
};
/**
* Disconnect from the Ripple network.
*/
Remote.prototype.disconnect = function (online) {
for (var i = 0, l = this._servers.length; i < l; i++) {
this._servers[i].disconnect();
}
this._set_state('offline');
return this;
};
@@ -455,136 +486,8 @@ Remote.prototype.ledger_hash = function () {
return this._ledger_hash;
};
// Stop from open state.
Remote.prototype._connect_stop = function () {
if (this.ws) {
delete this.ws.onerror;
delete this.ws.onclose;
this.ws.close();
delete this.ws;
}
this._set_state('offline');
};
// Implictly we are not connected.
Remote.prototype._connect_retry = function () {
var self = this;
if (!self.online_target) {
// Do not continue trying to connect.
this._set_state('offline');
}
else if ('connecting' !== this._online_state) {
// New to connecting state.
this._online_state = 'connecting';
this.retry = 0;
this._set_state('offline'); // Report newly offline.
this._connect_start();
}
else
{
// Delay and retry.
this.retry += 1;
this.retry_timer = setTimeout(function () {
if (self.trace) console.log("remote: retry");
if (self._server_fatal) {
// Stop trying to connect.
// nothing();
console.log("FATAL");
}
else if (self.online_target) {
self._connect_start();
}
else {
self._connect_retry();
}
}, this.retry < 40
? 1000/20 // First, for 2 seconds: 20 times per second
: this.retry < 40+60
? 1000 // Then, for 1 minute: once per second
: this.retry < 40+60+60
? 10*1000 // Then, for 10 minutes: once every 10 seconds
: 30*1000); // Then: once every 30 seconds
}
};
Remote.prototype._connect_start = function () {
// Note: as a browser client can't make encrypted connections to random ips
// with self-signed certs as the user must have pre-approved the self-signed certs.
var self = this;
var url = (this.websocket_ssl ? "wss://" : "ws://") +
this.websocket_ip + ":" + this.websocket_port;
if (this.trace) console.log("remote: connect: %s", url);
// There should not be an active connection at this point, but if there is
// we will shut it down so we don't end up with a duplicate.
if (this.ws) {
this._connect_stop();
}
var WebSocket = require('ws');
var ws = this.ws = new WebSocket(url);
ws.response = {};
ws.onopen = function () {
if (self.trace) console.log("remote: onopen: %s: online_target=%s", ws.readyState, self.online_target);
ws.onerror = function () {
if (self.trace) console.log("remote: onerror: %s", ws.readyState);
delete ws.onclose;
self._connect_retry();
};
ws.onclose = function () {
if (self.trace) console.log("remote: onclose: %s", ws.readyState);
delete ws.onerror;
self._connect_retry();
};
if (self.online_target) {
// Note, we could get disconnected before this goes through.
self._server_subscribe(); // Automatically subscribe.
}
else {
self._connect_stop();
}
};
ws.onerror = function () {
if (self.trace) console.log("remote: onerror: %s", ws.readyState);
delete ws.onclose;
self._connect_retry();
};
// Failure to open.
ws.onclose = function () {
if (self.trace) console.log("remote: onclose: %s", ws.readyState);
delete ws.onerror;
self._connect_retry();
};
ws.onmessage = function (json) {
self._connect_message(ws, json.data);
};
};
// It is possible for messages to be dispatched after the connection is closed.
Remote.prototype._connect_message = function (ws, json) {
Remote.prototype._handle_message = function (json) {
var self = this;
var message = JSON.parse(json);
var unexpected = false;
@@ -596,28 +499,7 @@ Remote.prototype._connect_message = function (ws, json) {
else {
switch (message.type) {
case 'response':
// A response to a request.
{
request = ws.response[message.id];
if (!request) {
unexpected = true;
}
else if ('success' === message.status) {
if (this.trace) utils.logObject("remote: response: %s", message);
request.emit('success', message.result);
}
else if (message.error) {
if (this.trace) utils.logObject("remote: error: %s", message);
request.emit('error', {
'error' : 'remoteError',
'error_message' : 'Remote reported an error.',
'remote' : message,
});
}
}
// Handled by the server that sent the request
break;
case 'ledgerClosed':
@@ -668,21 +550,16 @@ Remote.prototype._connect_message = function (ws, json) {
this.emit('transaction_all', message);
break;
// XXX Should be tracked by the Server object
case 'serverStatus':
// This message is only received when online. As we are connected, it is the definative final state.
this._set_state(
Remote.online_states.indexOf(message.server_status) !== -1
? 'online'
: 'offline');
if ('load_base' in message
&& 'load_factor' in message
&& (message.load_base !== this._load_base || message.load_factor != this._load_factor))
if ('load_base' in message &&
'load_factor' in message &&
(message.load_base !== self._load_base || message.load_factor != self._load_factor))
{
this._load_base = message.load_base;
this._load_factor = message.load_factor;
self._load_base = message.load_base;
self._load_factor = message.load_factor;
this.emit('load', { 'load_base' : this._load_base, 'load_factor' : this.load_factor });
self.emit('load', { 'load_base' : self._load_base, 'load_factor' : self.load_factor });
}
break;
@@ -694,12 +571,8 @@ Remote.prototype._connect_message = function (ws, json) {
}
}
if (!unexpected) {
}
// Unexpected response from remote.
// XXX This isn't so robust. Hard fails should probably only happen in a debugging scenairo.
else if (this.trusted) {
// Remote is trusted, report an error.
if (unexpected) {
console.log("unexpected message from trusted remote: %s", json);
(request || this).emit('error', {
@@ -707,34 +580,16 @@ Remote.prototype._connect_message = function (ws, json) {
'error_message' : 'Unexpected response from remote.'
});
}
else {
// Treat as a disconnect.
if (this.trace) console.log("unexpected message from untrusted remote: %s", json);
// XXX All pending request need this treatment and need to actionally disconnect.
(request || this).emit('error', {
'error' : 'remoteDisconnected',
'error_message' : 'Remote disconnected.'
});
}
};
// Send a request.
// <-> request: what to send, consumed.
Remote.prototype.request = function (request) {
if (this.ws) {
// Only bother if we are still connected.
this.ws.response[request.message.id = this.id] = request;
this.id += 1; // Advance id.
if (this.trace) utils.logObject("remote: request: %s", request.message);
this.ws.send(JSON.stringify(request.message));
}
else {
if (this.trace) utils.logObject("remote: request: DROPPING: %s", request.message);
if (!this._servers.length) {
throw new Error("No servers available.");
} else {
// XXX Add support for multiple servers
this._servers[0].request(request);
}
};
@@ -1043,10 +898,16 @@ Remote.prototype.request_submit = function () {
// Higher level functions.
//
// Subscribe to a server to get 'ledger_closed' events.
// 'subscribed' : This command was successful.
// 'ledger_closed : ledger_closed and ledger_current_index are updated.
Remote.prototype._server_subscribe = function () {
/**
* Create a subscribe request with current subscriptions.
*
* Other classes can add their own subscriptions to this request by listening to
* the server_subscribe event.
*
* This function will create and return the request, but not submit it.
*/
Remote.prototype._server_prepare_subscribe = function ()
{
var self = this;
var feeds = [ 'ledger', 'server' ];
@@ -1054,47 +915,46 @@ Remote.prototype._server_subscribe = function () {
if (this._transaction_subs)
feeds.push('transactions');
this.request_subscribe(feeds)
.on('success', function (message) {
self._stand_alone = !!message.stand_alone;
self._testnet = !!message.testnet;
var req = this.request_subscribe(feeds);
if ("string" === typeof message.random) {
var rand = message.random.match(/[0-9A-F]{8}/ig);
while (rand && rand.length)
sjcl.random.addEntropy(parseInt(rand.pop(), 16));
req.on('success', function (message) {
self._stand_alone = !!message.stand_alone;
self._testnet = !!message.testnet;
self.emit('random', utils.hexToArray(message.random));
}
if ("string" === typeof message.random) {
var rand = message.random.match(/[0-9A-F]{8}/ig);
while (rand && rand.length)
sjcl.random.addEntropy(parseInt(rand.pop(), 16));
if (message.ledger_hash && message.ledger_index) {
self._ledger_time = message.ledger_time;
self._ledger_hash = message.ledger_hash;
self._ledger_current_index = message.ledger_index+1;
self.emit('random', utils.hexToArray(message.random));
}
self.emit('ledger_closed', message);
}
if (message.ledger_hash && message.ledger_index) {
self._ledger_time = message.ledger_time;
self._ledger_hash = message.ledger_hash;
self._ledger_current_index = message.ledger_index+1;
// FIXME Use this to estimate fee.
self._load_base = message.load_base || 256;
self._load_factor = message.load_factor || 1.0;
self._fee_ref = message.fee_ref;
self._fee_base = message.fee_base;
self._reserve_base = message.reserve_base;
self._reserve_inc = message.reserve_inc;
self._server_status = message.server_status;
self.emit('ledger_closed', message);
}
if (Remote.online_states.indexOf(message.server_status) !== -1) {
self._set_state('online');
}
// FIXME Use this to estimate fee.
// XXX When we have multiple server support, most of this should be tracked
// by the Server objects and then aggregated/interpreted by Remote.
self._load_base = message.load_base || 256;
self._load_factor = message.load_factor || 1.0;
self._fee_ref = message.fee_ref;
self._fee_base = message.fee_base;
self._reserve_base = message.reserve_base;
self._reserve_inc = message.reserve_inc;
self.emit('subscribed');
})
.request();
self.emit('subscribed');
});
self.emit('prepare_subscribe', req);
// XXX Could give error events, maybe even time out.
return this;
return req;
};
// For unit testing: ask the remote to accept the current ledger.

232
src/js/server.js Normal file
View File

@@ -0,0 +1,232 @@
var EventEmitter = require('events').EventEmitter;
var utils = require('./utils');
var Server = function (remote, cfg)
{
if ("object" !== typeof cfg || "string" !== typeof cfg.url) {
throw new Error("Invalid server configuration.");
}
this._remote = remote;
this._cfg = cfg;
this._ws = null;
this._connected = false;
this._should_connect = false;
this._state = null;
this._id = 0;
this._retry = 0;
this._requests = [];
this.on('message', this._handle_message.bind(this));
this.on('response_subscribe', this._handle_response_subscribe.bind(this));
};
Server.prototype = new EventEmitter;
/**
* Server states that we will treat as the server being online.
*
* Our requirements are that the server can process transactions and notify
* us of changes.
*/
Server.online_states = [
'proposing',
'validating',
'full'
];
Server.prototype.connect = function ()
{
var self = this;
// We don't connect if we believe we're already connected. This means we have
// recently received a message from the server and the WebSocket has not
// reported any issues either. If we do fail to ping or the connection drops,
// we will automatically reconnect.
if (this._connected === true) return;
if (this._remote.trace) console.log("server: connect: %s", this._cfg.url);
// Ensure any existing socket is given the command to close first.
if (this._ws) this._ws.close();
var WebSocket = require('ws');
var ws = this._ws = new WebSocket(this._cfg.url);
this._should_connect = true;
self.emit('connecting');
ws.onopen = function () {
// If we are no longer the active socket, simply ignore any event
if (ws !== self._ws) return;
self.emit('socket_open');
// Subscribe to events
var request = self._remote._server_prepare_subscribe();
self.request(request);
};
ws.onerror = function (e) {
// If we are no longer the active socket, simply ignore any event
if (ws !== self._ws) return;
if (self._remote.trace) console.log("server: onerror: %s", e.data || e);
// Most connection errors for WebSockets are conveyed as "close" events with
// code 1006. This is done for security purposes and therefore unlikely to
// ever change.
// This means that this handler is hardly ever called in practice. If it is,
// it probably means the server's WebSocket implementation is corrupt, or
// the connection is somehow producing corrupt data.
// Most WebSocket applications simply log and ignore this error. Once we
// support for multiple servers, we may consider doing something like
// lowering this server's quality score.
// However, in Node.js this event may be triggered instead of the close
// event, so we need to handle it.
handleConnectionClose();
};
// Failure to open.
ws.onclose = function () {
// If we are no longer the active socket, simply ignore any event
if (ws !== self._ws) return;
if (self._remote.trace) console.log("server: onclose: %s", ws.readyState);
handleConnectionClose();
};
function handleConnectionClose()
{
self.emit('socket_close');
self._set_state('offline');
// Should we be connected?
if (!self._should_connect) return;
// Delay and retry.
self._retry += 1;
self._retry_timer = setTimeout(function () {
if (self._remote.trace) console.log("server: retry");
if (!self._should_connect) return;
self.connect();
}, self._retry < 40
? 1000/20 // First, for 2 seconds: 20 times per second
: self._retry < 40+60
? 1000 // Then, for 1 minute: once per second
: self._retry < 40+60+60
? 10*1000 // Then, for 10 minutes: once every 10 seconds
: 30*1000); // Then: once every 30 seconds
}
ws.onmessage = function (msg) {
self.emit('message', msg.data);
};
};
Server.prototype.disconnect = function ()
{
this._should_connect = false;
this._set_state('offline');
if (this.ws) {
this.ws.close();
}
};
/**
* Submit a Request object to this server.
*/
Server.prototype.request = function (request)
{
// Only bother if we are still connected.
if (this._ws) {
request.message.id = this._id;
this._requests[request.message.id] = request;
// Advance message ID
this._id++;
if (this._remote.trace) {
utils.logObject("server: request: %s", request.message);
}
this._ws.send(JSON.stringify(request.message));
} else {
if (this._remote.trace) {
utils.logObject("server: request: DROPPING: %s", request.message);
}
}
};
Server.prototype._set_state = function (state) {
if (state !== this._state) {
this._state = state;
this.emit('state', state);
if (state === 'online') {
this.emit('connect');
} else if (state === 'offline') {
this.emit('disconnect');
}
}
};
Server.prototype._handle_message = function (json) {
var self = this;
var message = JSON.parse(json);
if (message.type === 'response') {
// A response to a request.
var request = self._requests[message.id];
if (!request) {
if (self._remote.trace) utils.logObject("server: UNEXPECTED: %s", message);
} else if ('success' === message.status) {
if (self._remote.trace) utils.logObject("server: response: %s", message);
request.emit('success', message.result);
self.emit('response_'+request.message.command, message.result, request, message);
self._remote.emit('response_'+request.message.command, message.result, request, message);
} else if (message.error) {
if (self._remote.trace) utils.logObject("server: error: %s", message);
request.emit('error', {
'error' : 'remoteError',
'error_message' : 'Remote reported an error.',
'remote' : message
});
}
} else if (message.type === 'serverStatus') {
// This message is only received when online. As we are connected, it is the definative final state.
self._set_state(
Server.online_states.indexOf(message.server_status) !== -1
? 'online'
: 'offline');
}
};
Server.prototype._handle_response_subscribe = function (message)
{
var self = this;
self._server_status = message.server_status;
if (Server.online_states.indexOf(message.server_status) !== -1) {
self._set_state('online');
}
};
exports.Server = Server;