From 92c66a6bbc07f5aa9d0d467458305bd657ca0b8f Mon Sep 17 00:00:00 2001
From: Carl Kittelberger <icedream@icedream.pw>
Date: Tue, 16 Feb 2016 18:23:59 +0100
Subject: [PATCH] Send empty command as keep-alive.

Fixes #36.

Inspired from http://py-ts3.readthedocs.org/en/latest/_modules/ts3/query.html.
---
 ts3query.iced | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/ts3query.iced b/ts3query.iced
index 4ff1230..56e1da6 100644
--- a/ts3query.iced
+++ b/ts3query.iced
@@ -140,6 +140,22 @@ module.exports = class TS3ClientQuery extends EventEmitter
 			else
 				@emit "vars", response.args
 
+		# send keepalives to avoid connection timeout
+		@_resetKeepalive()
+
+	_sendKeepalive: (cb) =>
+		@_log.silly "Send: <keep-alive>"
+
+		@_tcpClient.write "\n\r", "utf8", () => cb?()
+
+	_stopKeepalive: () =>
+		if @_keepaliveInt is not undefined
+			clearInterval @_keepaliveInt
+
+	_resetKeepalive: () =>
+		@_stopKeepalive()
+		@_keepaliveInt = setInterval @_sendKeepalive, 60000
+
 	close: (cb) =>
 		if not @_tcpClient
 			cb?()
@@ -165,6 +181,7 @@ module.exports = class TS3ClientQuery extends EventEmitter
 		@_log.silly "Send:", text.trim()
 
 		@_tcpClient.write text, "utf8", () => cb?()
+		@_resetKeepalive()
 
 	banadd: (cb) =>
 		throw new Error "Not implemented yet"