7aeea9353d
Implemented a production-ready TypeScript/Express.js service to receive and log MailGun webhook events (delivered, failed, opened, clicked, etc.). Key features: - Webhook endpoint (POST /webhook) with comprehensive event logging - Full TypeScript type definitions for all MailGun event types - Prometheus metrics integration for monitoring - Health check endpoint (GET /ping) - Comprehensive Jest test suite with 87.76% coverage - Docker containerization with build scripts Removed template/example code: - All SQL/MSSQL dependencies and related code - Example auth router and middleware - PRTG metrics support (simplified to Prometheus only) - Unused middleware (CORS, IP whitelist, request parsing/validation) - Template documentation (kept only MailGun webhook API spec) The service is clean, minimal, and focused solely on receiving and logging MailGun webhook events to the console. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
33 lines
1.3 KiB
TypeScript
33 lines
1.3 KiB
TypeScript
import { ErrorRequestHandler, Request, Response } from "express";
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import { HttpError } from "http-errors";
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import { logError } from '../lib/logger';
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/**
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* Final error handler that executes when an unhandled error occurs.
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* This prevents the server from crashing and ensures proper response handling.
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*
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* @param err - HTTP error object
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* @param req - Express request object
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* @param res - Express response object
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* @param next - Express next function
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*/
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export const finalErrorRouter:ErrorRequestHandler = async (err:HttpError, req, res, next) => {
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const errorLogText:string = JSON.stringify({ message:err.message, name:err.name, stack:err.stack });
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logError("server error", `${err.status}; n${errorLogText}`);
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// `headersSent` will be TRUE if the router where the error occurred has already sent headers
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// If we try to set them again, it will throw an error and CRASH THE SERVER - we must prevent this
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if(!res.headersSent) {
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res.status(err.status);
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res.setHeader('Content-Type', "text/html");
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res.end(`unhandled server error`);
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} else {
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// If `end` hasn't been called - call it to finish processing the request
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// Otherwise the connection will remain open until timeout
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if(!res.writableEnded) {
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res.end();
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}
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}
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}; |