refactor(infra): directory structure (#4615)

packages/backend/server/src/middleware/exception-logger.ts

@@ -0,0 +1,52 @@
+import {
+  ArgumentsHost,
+  Catch,
+  ExceptionFilter,
+  HttpException,
+  Logger,
+  NotFoundException,
+} from '@nestjs/common';
+import { GqlContextType } from '@nestjs/graphql';
+import { Request, Response } from 'express';
+
+import { REQUEST_ID } from '../constants';
+const TrivialExceptions = [NotFoundException];
+
+@Catch()
+export class ExceptionLogger implements ExceptionFilter {
+  private logger = new Logger('ExceptionLogger');
+
+  catch(exception: Error, host: ArgumentsHost) {
+    // with useGlobalFilters, the context is always HTTP
+    const ctx = host.switchToHttp();
+
+    const request = ctx.getRequest<Request>();
+    const requestId = request?.header(REQUEST_ID);
+
+    const shouldVerboseLog = !TrivialExceptions.some(
+      e => exception instanceof e
+    );
+    this.logger.error(
+      new Error(
+        `${requestId ? `requestId-${requestId}: ` : ''}${exception.message}${
+          shouldVerboseLog ? '\n' + exception.stack : ''
+        }}`,
+        { cause: exception }
+      )
+    );
+
+    if (host.getType<GqlContextType>() === 'graphql') {
+      return;
+    }
+
+    const response = ctx.getResponse<Response>();
+    if (exception instanceof HttpException) {
+      response.status(exception.getStatus()).json(exception.getResponse());
+    } else {
+      response.status(500).json({
+        statusCode: 500,
+        error: exception.message,
+      });
+    }
+  }
+}

packages/backend/server/src/middleware/timing.ts

@@ -0,0 +1,27 @@
+import { NextFunction, Request, Response } from 'express';
+import onHeaders from 'on-headers';
+
+export const serverTimingAndCache = (
+  req: Request,
+  res: Response,
+  next: NextFunction
+) => {
+  req.res = res;
+  const now = process.hrtime();
+
+  onHeaders(res, () => {
+    const delta = process.hrtime(now);
+    const costInMilliseconds = (delta[0] + delta[1] / 1e9) * 1000;
+
+    const serverTiming = res.getHeader('Server-Timing') as string | undefined;
+    const serverTimingValue = `${
+      serverTiming ? `${serverTiming}, ` : ''
+    }total;dur=${costInMilliseconds}`;
+
+    res.setHeader('Server-Timing', serverTimingValue);
+  });
+
+  res.setHeader('Cache-Control', 'max-age=0, private, must-revalidate');
+
+  next();
+};