Add method to check if method exists

Author: geekgonecrazy

src/rocketchat.coffee

@@ -163,9 +163,16 @@ class RocketChatBotAdapter extends Adapter
 
 						user = @robot.brain.userForId newmsg.u._id, name: newmsg.u.username, alias: newmsg.alias
 
-						@chatdriver.getRoomName(newmsg.rid).then((roomName)=>
-							user.room = roomName
+						@chatdriver.checkMethodExists("getRoomNameById").then(() =>
+							return @chatdriver.getRoomName(newmsg.rid).then((roomName) =>
+								@robot.logger.info("setting roomName: #{roomName}")
+								user.room = roomName
+							)
+						).catch((err) =>
+							return Q()
+						).then(() =>
 							user.roomID = newmsg.rid
+
 							if newmsg.t is 'uj'
 								@robot.receive new EnterMessage user, null, newmsg._id
 							else
@@ -193,9 +200,6 @@ class RocketChatBotAdapter extends Adapter
 								message.text = "#{ @robot.name } #{ message.text }"
 							@robot.receive message
 							@robot.logger.info "Message sent to hubot brain."
-						).catch((roomErr) =>
-							@robot.logger.error "Unable to get room name: #{JSON.stringify(roomErr)} Reason: #{roomErr.reason}"
-							throw roomErr
 						)
 			)
 			.then(() =>

src/rocketchat_driver.coffee

@@ -11,6 +11,8 @@ _msgsubtopic = 'stream-room-messages' # 'messages'
 _msgsublimit = 10 # this is not actually used right now
 _messageCollection = 'stream-room-messages'
 
+_methodExists = {}
+
 # room id cache
 _roomCacheSize = parseInt(process.env.ROOM_ID_CACHE_SIZE) || 10
 _directMessageRoomCacheSize = parseInt(process.env.DM_ROOM_ID_CACHE_SIZE) || 100
@@ -46,6 +48,28 @@ class RocketChatDriver
 	getDirectMessageRoomId: (username) =>
 		@tryCache _directMessageRoomIdCache, 'createDirectMessage', username, 'DM Room ID'
 
+	checkMethodExists: (method) =>
+		if !_methodExists[method]?
+			@logger.info "Checking to see if method: #{method} exists"
+			r = @asteroid.call(method, "")
+			r.result.then((res) =>
+				_methodExists[method] = true
+				return Q()
+			).catch((err) =>
+				if err.error == 404
+					_methodExists[method] = false
+					@logger.info "Method: #{method} does not exist"
+					return Q.reject("Method: #{method} does not exist")
+				else
+					_methodExists[method] = true
+					return Q()
+			)
+		else
+			if _methodExists[method]
+				return Q()
+			else
+				return Q.reject()
+
 	tryCache: (cacheArray, method, key, name) =>
 		name ?= method
 		cached = cacheArray.get key
@@ -55,9 +79,10 @@ class RocketChatDriver
 		else
 			@logger.info "Looking up #{name} for: #{key}"
 			r = @asteroid.call method, key
-			return r.result.then (res) =>
+			return r.result.then((res) =>
 				cacheArray.set key, res
 				return Q(res)
+			)
 
 	joinRoom: (userid, uname, roomid, cb) =>
 		@logger.info "Joining Room: #{roomid}"