Provide context data to getAnnounceOpts

Author: yciabaud

README.md

@@ -59,9 +59,10 @@ var requiredOpts = {
 }
 
 var optionalOpts = {
-  getAnnounceOpts: function () {
+  getAnnounceOpts: function (opts) {
     // Provide a callback that will be called whenever announce() is called
-    // internally (on timer), or by the user
+    // internally (on timer), or by the user.
+    // this refers to the tracker and opts to the current announce options.
     return {
       uploaded: 0,
       downloaded: 0,

client.js

@@ -61,7 +61,7 @@ function Client (opts) {
   self.destroyed = false
 
   self._port = opts.port
-  self._getAnnounceOpts = opts.getAnnounceOpts
+  self._getAnnounceOpts = opts.getAnnounceOpts && opts.getAnnounceOpts.bind(self)
   self._rtcConfig = opts.rtcConfig
   self._userAgent = opts.userAgent
 
@@ -296,6 +296,6 @@ Client.prototype._defaultAnnounceOpts = function (opts) {
   if (opts.uploaded == null) opts.uploaded = 0
   if (opts.downloaded == null) opts.downloaded = 0
 
-  if (self._getAnnounceOpts) opts = extend(opts, self._getAnnounceOpts())
+  if (self._getAnnounceOpts) opts = extend(opts, self._getAnnounceOpts(opts))
   return opts
 }