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Make metrics less error prone #810

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The bridge is prone to erroring with things like:

(node:1) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'get' of undefined
    at PrometheusBridgeMetrics.sdkEndMetric (/src/metrics.ts:207:54)
    at /node_modules/matrix-bot-sdk/lib/metrics/Metrics.js:73:39
    at Array.forEach (<anonymous>)
    at Metrics.end (/node_modules/matrix-bot-sdk/lib/metrics/Metrics.js:73:24)
    at /node_modules/matrix-bot-sdk/lib/metrics/decorators.js:35:40
    at <anonymous>
    at processTicksAndRejections (internal/process/task_queues.js:95:5)

Which is mostly due to the fact that our metrics system is:

  1. Not correctly initalising the Maps
  2. Listening in the wrong places for the wrong metrics.

I've also updated the matrix-appservice-bridge library to be on the latest version, I don't think it's changes will affect us too badly.

@Half-Shot
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Depends on #811 due to requiring Node 14.

@Half-Shot Half-Shot requested a review from a team July 15, 2022 08:21
@@ -1,5 +1,5 @@
/*
Copyright 2017 - 2019 matrix-appservice-discord
Copyright 2017 - 2019 matrix-appservice-discord, 2022 (C) The Matrix.org Foundation C.I.C.
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Maybe let's just make a single change to update all of these at once 😆

@@ -181,6 +181,16 @@ async function run(): Promise<void> {
const roomhandler = discordbot.RoomHandler;
const eventProcessor = discordbot.MxEventProcessor;


process.once("SIGINT", () => {
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This should trigger on SIGTERM too.

public async stop(): Promise<void> {
public stop(): void {
this.presenceHandler.Stop();
this._bot?.destroy();
this._bot = undefined;
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Nitpick suggestion:

if (this._bot) {
    this._bot.destroy();
    this._bot = undefined; 
}

since there's a branch buried in the ?. anyways.

@Half-Shot Half-Shot self-assigned this Aug 11, 2022
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2 participants