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exponential backoff for ws reconnection #130

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exponential backoff for ws reconnection #130

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ec303c9
exponential backoff for ws reconnection
FelipeTrost Apr 17, 2025
0b11c85
slower backoff + max 1s backoff
FelipeTrost Apr 17, 2025
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17 changes: 13 additions & 4 deletions src/snapcontrol.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -261,6 +261,7 @@ class SnapControl {
this.msg_id = 0;
this.status_req_id = -1;
this.timer = null;
this.reconnection_attempts = 0;
}

public connect(baseUrl: string) {
Expand All @@ -269,6 +270,7 @@ class SnapControl {
this.connection = new WebSocket(baseUrl + '/jsonrpc');
this.connection.onmessage = (msg: MessageEvent) => this.onMessage(msg.data);
this.connection.onopen = () => {
this.reconnection_attempts = 0;
this.status_req_id = this.sendRequest('Server.GetStatus');
if (this.onConnectionChanged)
this.onConnectionChanged(this, true);
Expand All @@ -277,17 +279,22 @@ class SnapControl {
this.connection.onclose = () => {
if (this.onConnectionChanged)
this.onConnectionChanged(this, false, 'Connection lost, trying to reconnect.');
console.info('connection lost, reconnecting in 1s');
this.timer = setTimeout(() => this.connect(baseUrl), 1000);
const reconnectionDelay = this.getReconnectDelay();
this.timer = setTimeout(() => this.connect(baseUrl), reconnectionDelay * 1000);
};
} catch (e) {
console.info('Exception while connecting: "' + e + '", reconnecting in 1s');
const reconnectionDelay = this.getReconnectDelay();
console.info('Exception while connecting: "' + e + '", reconnecting in ' + reconnectionDelay + 's');
if (this.onConnectionChanged)
this.onConnectionChanged(this, false, 'Exception while connecting: "' + e + '", trying to reconnect.');
this.timer = setTimeout(() => this.connect(baseUrl), 1000);
this.timer = setTimeout(() => this.connect(baseUrl), reconnectionDelay * 1000);
}
}

private getReconnectDelay() {
return Math.min(1.1 ** this.reconnection_attempts++ - 1, 1);
}

public disconnect() {
if (this.timer)
clearTimeout(this.timer);
Expand All @@ -298,6 +305,7 @@ class SnapControl {
}
}
if (this.onConnectionChanged)

this.onConnectionChanged(this, false);
}

Expand Down Expand Up @@ -532,6 +540,7 @@ class SnapControl {
msg_id: number;
status_req_id: number;
timer: ReturnType<typeof setTimeout> | null;
reconnection_attempts: number
}


Expand Down