Update Remote constructor comments

src/js/ripple/pathfind.js

@@ -0,0 +1,78 @@
+var EventEmitter = require('events').EventEmitter;
+var util = require('util');
+
+var Amount        = require('./amount').Amount;
+
+var extend = require('extend');
+
+/**
+ * Represents a persistent path finding request.
+ *
+ * Only one path find request is allowed per connection, so when another path
+ * find request is triggered it will supercede the existing one, making it emit
+ * the 'end' and 'superceded' events.
+ */
+var PathFind = function (remote, src_account, dst_account,
+                         dst_amount, src_currencies)
+{
+  EventEmitter.call(this);
+
+  this.remote = remote;
+
+  this.src_account    = src_account;
+  this.dst_account    = dst_account;
+  this.dst_amount     = dst_amount;
+  this.src_currencies = src_currencies;
+};
+
+util.inherits(PathFind, EventEmitter);
+
+/**
+ * Submits a path_find_create request to the network.
+ *
+ * This starts a path find request, superceding all previous path finds.
+ *
+ * This will be called automatically by Remote when this object is instantiated,
+ * so you should only have to call it if the path find was closed or superceded
+ * and you wish to restart it.
+ */
+PathFind.prototype.create = function ()
+{
+  var req = this.remote.request_path_find_create(this.src_account,
+                                                 this.dst_account,
+                                                 this.dst_amount,
+                                                 this.src_currencies);
+
+  req.request();
+};
+
+PathFind.prototype.close = function ()
+{
+  this.remote.request_path_find_close().request();
+  this.emit('end');
+  this.emit('close');
+};
+
+PathFind.prototype.notify_update = function (message)
+{
+  var src_account = message.source_account;
+  var dst_account = message.destination_account;
+  var dst_amount  = Amount.from_json(message.destination_amount);
+
+  // Only pass the event along if this path find response matches what we were
+  // looking for.
+  if (message.alternatives && message.alternatives.length) console.log(Amount.from_json(message.alternatives[0].source_amount).to_text_full());
+  if (this.src_account === src_account &&
+      this.dst_account === dst_account &&
+      this.dst_amount.equals(dst_amount)) {
+    this.emit('update', message);
+  }
+};
+
+PathFind.prototype.notify_superceded = function ()
+{
+  this.emit('end');
+  this.emit('superceded');
+};
+
+exports.PathFind = PathFind;

src/js/ripple/remote.js

@@ -41,12 +41,16 @@ var sjcl         = require('../../../build/sjcl');
     Keys for opts:
 
       trusted            : truthy, if remote is trusted
-      websocket_ip
-      websocket_port
-      websocket_ssl
       trace
       maxListeners
       fee_cushion       : Extra fee multiplier to account for async fee changes.
+      servers           : Array of server objects with the following form
+
+         { 
+            host:    <string>,
+            port:    <number>,
+            secure:  <boolean>
+         }
 
     Events:
       'connect'
@@ -107,6 +111,7 @@ function Remote(opts, trace) {
   this._connected            = false;
 
   this._last_tx              = null;
+  this._cur_path_find        = null;
 
   // Local signing implies local fees and sequences
   if (this.local_signing) {
@@ -435,16 +440,24 @@ Remote.prototype._handle_message = function (json) {
       this.emit('transaction_all', message);
       break;
 
-    // XXX Should be tracked by the Server object
-    case 'serverStatus':
-      self.emit('server_status', message);
+      case 'path_find':
+        // Pass the event to the currently open PathFind object
+        if (this._cur_path_find) {
+          this._cur_path_find.notify_update(message);
+        }
 
-      if ('load_base' in message && 'load_factor' in message &&
-          (message.load_base !== self._load_base || message.load_factor != self._load_factor))
-      {
-        self._load_base     = message.load_base;
-        self._load_factor   = message.load_factor;
+        this.emit('path_find_all', message);
+        break;
 
+      // XXX Should be tracked by the Server object
+      case 'serverStatus':
+        self.emit('server_status', message);
+
+        if ('load_base' in message && 'load_factor' in message &&
+            (message.load_base !== self._load_base || message.load_factor != self._load_factor))
+        {
+          self._load_base     = message.load_base;
+          self._load_factor   = message.load_factor;
         self.emit('load', { 'load_base' : self._load_base, 'load_factor' : self.load_factor });
       }
       break;
@@ -986,6 +999,24 @@ Remote.prototype.account = function (accountId) {
   return account;
 };
 
+Remote.prototype.path_find = function (src_account, dst_account,
+                                       dst_amount, src_currencies)
+{
+  var path_find = new PathFind(this,
+                               src_account, dst_account,
+                               dst_amount, src_currencies);
+
+  if (this._cur_path_find) {
+    this._cur_path_find.notify_superceded();
+  }
+
+  path_find.create();
+
+  this._cur_path_find = path_find;
+
+  return path_find;
+};
+
 Remote.prototype.book = function (currency_gets, issuer_gets,
                                   currency_pays, issuer_pays) {
   var gets = currency_gets;
@@ -1160,6 +1191,47 @@ Remote.prototype.request_ripple_path_find = function (src_account, dst_account,
   return request;
 };
 
+Remote.prototype.request_path_find_create = function (src_account, dst_account,
+                                                      dst_amount,
+                                                      src_currencies, callback)
+{
+  var self    = this;
+  var request = new Request(this, 'path_find');
+
+  request.message.subcommand          = 'create';
+  request.message.source_account      = UInt160.json_rewrite(src_account);
+  request.message.destination_account = UInt160.json_rewrite(dst_account);
+  request.message.destination_amount  = Amount.json_rewrite(dst_amount);
+
+  if (src_currencies) {
+    request.message.source_currencies   = src_currencies.map(function (ci) {
+      var ci_new  = {};
+
+      if ('issuer' in ci)
+        ci_new.issuer   = UInt160.json_rewrite(ci.issuer);
+
+      if ('currency' in ci)
+        ci_new.currency = Currency.json_rewrite(ci.currency);
+
+      return ci_new;
+    });
+  }
+
+  request.callback(callback);
+
+  return request;
+};
+
+Remote.prototype.request_path_find_close = function ()
+{
+  var self    = this;
+  var request = new Request(this, 'path_find');
+
+  request.message.subcommand          = 'close';
+
+  return request;
+};
+
 Remote.prototype.request_unl_list = function (callback) {
   var request = new Request(this, 'unl_list');
   request.callback(callback);