Cloudflare Workers

Is your feature request related to a problem? Please describe. I’m unable to integrate the application insights JavaScript library into my Cloudflare JavaScript Worker. https://workers.cloudflare.com/

Describe the solution you’d like To use the application insights library to track errors, events and dependencies in my Cloudflare Worker so I can get visibility into any interesting events in the worker. Have also tried @microsoft/applicationinsights-web-basic but not luck.

Describe alternatives you’ve considered I’ve tried the NodeJS library (https://github.com/Microsoft/ApplicationInsights-node.js) as well, however Cloudflare workers are web workers so is not a NodeJS process but a v8 thread instead.

Additional context Example Worker

import { ApplicationInsights, SeverityLevel } from '@microsoft/applicationinsights-web';
import { v4 as uuidv4 } from 'uuid';

const responseOk: Response = new Response(null, { status: 200, statusText: 'OK' });
const responseMethodNotAllowed: Response = new Response(null, { status: 405, statusText: 'Method Not Allowed' });
const responseInternalServerError: Response = new Response(null, { status: 500, statusText: 'Internal Server Error' });

const appInsights = new ApplicationInsights({
    config: {
        instrumentationKey: '{{ Instrumentation Key Here }}'
    }
});

async function handleGETRequests(request: Request): Promise<Response> {
    try {
        // Do some orchestration fetch calls

        return responseOk;
    } catch (ex) {
        appInsights.trackException({
            id: uuidv4(),
            exception: ex,
            severityLevel: SeverityLevel.Critical
        })
        return responseInternalServerError;
    }
}

function handler(event: FetchEvent) {
    switch (event.request.method) {
        case 'GET':
            event.respondWith(handleGETRequests(event.request).then(response => {
                appInsights.flush();
                return response;
            }));
        default:
            event.respondWith(responseMethodNotAllowed);
    }
}

appInsights.loadAppInsights();
addEventListener('fetch', handler);

Resulting Error The fetch API is supported, but not XMLHttpRequest.

Even if fetch was used, the promise might need to be exposed from application insights to hook into the lifecycle of the request & response.

[vanslly]

@sazzy4o Thank you for creating, I am very keen to give this go. I was going to loop back and create something to fill the gap and you beat me to it!

To launch our product I had to switch to logging into Elasticsearch for MVP for the interim, but the latency between my Elasticsearch instance and CF edge locations is huge, and I didn’t do any log batching which you can so easily do with the Application Insights endpoint.

Thanks again, look forward to reunifying logging with App Insights.

[sazzy4o]

@vanslly I have recently created an npm package that allows you to use application insights with cloudflare workers: https://www.npmjs.com/package/applicationinsights-cloudflareworkers Maybe it might help 👍