Simple Logflare Cloudflare worker

simpleCloudflareLogflareWorker.js

const makeid = length => {
        let text = ""
        const possible = "ABCDEFGHIJKLMNPQRSTUVWXYZ0123456789"
        for (let i = 0; i < length; i += 1) {
            text += possible.charAt(Math.floor(Math.random() * possible.length))
        }
        return text
    }

    const buildMetadataFromHeaders = headers => {
        const responseMetadata = {}
        Array.from(headers).forEach(([key, value]) => {
            responseMetadata[key.replace(/-/g, "_")] = value
        })
        return responseMetadata
    }

    const WORKER_ID = makeid(6)

    async function handleRequest(event) {
        const {
            request
        } = event;
        const rMeth = request.method
        const rUrl = request.url
        const uAgent = request.headers.get("user-agent")
        const rHost = request.headers.get("host")
        const cfRay = request.headers.get("cf-ray")
        const cIP = request.headers.get("cf-connecting-ip")
        const rCf = request.cf

        const requestMetadata = buildMetadataFromHeaders(request.headers)

        const sourceKey = "YOUR_SOURCE_ID"
        const apiKey = "YOUR_API_KEY"

        const t1 = Date.now()
        const response = await fetch(request)
        const originTimeMs = Date.now() - t1

        const statusCode = response.status

        const responseMetadata = buildMetadataFromHeaders(response.headers)

        const logEntry = `${rMeth} | ${statusCode} | ${cIP} | ${cfRay} | ${rUrl} | ${uAgent}`

        const logflareEventBody = {
            source: sourceKey,
            log_entry: logEntry,
            metadata: {
                response: {
                    headers: responseMetadata,
                    origin_time: originTimeMs,
                    status_code: response.status,
                },
                request: {
                    url: rUrl,
                    method: rMeth,
                    headers: requestMetadata,
                    cf: rCf,
                },
                logflare_worker: {
                    worker_id: WORKER_ID,
                },
            },
        }

        const init = {
            method: "POST",
            headers: {
                "X-API-KEY": apiKey,
                "Content-Type": "application/json",
                "User-Agent": `Cloudflare Worker via ${rHost}`
            },
            body: JSON.stringify(logflareEventBody),
        }

        event.waitUntil(fetch("https://api.logflare.app/logs", init))

        return response
    }

    addEventListener("fetch", event => {
        event.passThroughOnException()

        event.respondWith(handleRequest(event))
    })