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Add a watchdog for the heartbeat #601

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Add a watchdog for the heartbeat #601

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285c39d
add watchdog for heartbeat
JFSolution Sep 15, 2022
a3f2d94
add timeout constant
JFSolution Sep 15, 2022
5c715e3
Update lib/main.js
auvipy Aug 7, 2025
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9 changes: 9 additions & 0 deletions lib/main.js
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Original file line number Diff line number Diff line change
Expand Up @@ -172,6 +172,7 @@ SockJS.CONNECTING = 0;
SockJS.OPEN = 1;
SockJS.CLOSING = 2;
SockJS.CLOSED = 3;
SockJS.WATCHDOG_WEBSOCKET_TIMEOUT = 30000; // The heartbeat appears every 25 seconds, so we have 5 seconds delay buffer

SockJS.prototype._receiveInfo = function(info, rtt) {
debug('_receiveInfo', rtt);
Expand Down Expand Up @@ -241,6 +242,11 @@ SockJS.prototype._transportTimeout = function() {
}
};

SockJS.prototype._websocketWatchdogCb = function(websocket) {
debug("watchdog websocket timeout");
websocket._close(1006, 'Server lost session');
Comment on lines +245 to +247
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Copilot AI Aug 7, 2025

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The parameter name 'websocket' is misleading as it refers to the SockJS instance, not a WebSocket. This should be 'sockjs' or 'self' to accurately reflect what it represents.

Suggested change
SockJS.prototype._websocketWatchdogCb = function(websocket) {
debug("watchdog websocket timeout");
websocket._close(1006, 'Server lost session');
SockJS.prototype._websocketWatchdogCb = function(sockjs) {
debug("watchdog websocket timeout");
sockjs._close(1006, 'Server lost session');

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};

SockJS.prototype._transportMessage = function(msg) {
debug('_transportMessage', msg);
var self = this
Expand All @@ -257,6 +263,8 @@ SockJS.prototype._transportMessage = function(msg) {
case 'h':
this.dispatchEvent(new Event('heartbeat'));
debug('heartbeat', this.transport);
clearTimeout(this.heartbeatWatchdog);
this.heartbeatWatchdog = setTimeout(this._websocketWatchdogCb, SockJS.WATCHDOG_WEBSOCKET_TIMEOUT, this);
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Copilot AI Aug 7, 2025

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The watchdog timer should be cleared when the connection is closed to prevent potential memory leaks and unexpected behavior. Consider adding clearTimeout(this.heartbeatWatchdog) in the _close method.

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return;
}

Expand Down Expand Up @@ -321,6 +329,7 @@ SockJS.prototype._open = function() {
this.transport = this._transport.transportName;
this.dispatchEvent(new Event('open'));
debug('connected', this.transport);
this.heartbeatWatchdog = setTimeout(this._websocketWatchdogCb, SockJS.WATCHDOG_WEBSOCKET_TIMEOUT, this);
} else {
// The server might have been restarted, and lost track of our
// connection.
Expand Down
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