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GUACAMOLE-567: Regularly test connection stability of HTTP tunnel.

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Unlike the WebSocket tunnel, where a manual ping request/response must
be explicitly implemented, we can rely on HTTP's own request/response
to verify stability.
This commit is contained in:
Michael Jumper
2018-09-06 19:57:29 -07:00
parent 819d317834
commit 34bab9524e
1 changed files with 29 additions and 0 deletions
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29
guacamole-common-js/src/main/webapp/modules/Tunnel.js
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@@ -258,6 +258,25 @@ Guacamole.HTTPTunnel = function(tunnelURL, crossDomain, extraTunnelHeaders) {
*/
var unstableTimeout = null;
/**
* The current connection stability test ping interval ID, if any. This
* will only be set upon successful connection.
*
* @private
* @type {Number}
*/
var pingInterval = null;
/**
* The number of milliseconds to wait between connection stability test
* pings.
*
* @private
* @constant
* @type {Number}
*/
var PING_FREQUENCY = 500;
/**
* Additional headers to be sent in tunnel requests. This dictionary can be
* populated with key/value header pairs to pass information such as authentication
@@ -327,6 +346,9 @@ Guacamole.HTTPTunnel = function(tunnelURL, crossDomain, extraTunnelHeaders) {
window.clearTimeout(receive_timeout);
window.clearTimeout(unstableTimeout);
// Cease connection test pings
window.clearInterval(pingInterval);
// Ignore if already closed
if (tunnel.state === Guacamole.Tunnel.State.CLOSED)
return;
@@ -413,6 +435,8 @@ Guacamole.HTTPTunnel = function(tunnelURL, crossDomain, extraTunnelHeaders) {
message_xmlhttprequest.onreadystatechange = function() {
if (message_xmlhttprequest.readyState === 4) {
reset_timeout();
// If an error occurs during send, handle it
if (message_xmlhttprequest.status !== 200)
handleHTTPTunnelError(message_xmlhttprequest);
@@ -687,6 +711,11 @@ Guacamole.HTTPTunnel = function(tunnelURL, crossDomain, extraTunnelHeaders) {
// Mark as open
tunnel.setState(Guacamole.Tunnel.State.OPEN);
// Ping tunnel endpoint regularly to test connection stability
pingInterval = setInterval(function sendPing() {
tunnel.sendMessage("nop");
}, PING_FREQUENCY);
// Start reading data
handleResponse(makeRequest());