feat: log unhandled errors and pretty dev output (WealthLedger/backend#120)

src/common/filters/http-exception.filter.spec.ts

@@ -1,24 +1,29 @@
-import { ArgumentsHost } from '@nestjs/common';
+import { ArgumentsHost, BadRequestException } from '@nestjs/common';
 
+import { StructuredLogger } from '../logging/structured-logger.service';
 import { HttpExceptionFilter } from './http-exception.filter';
 
 describe('HttpExceptionFilter', () => {
-  it('does not expose internal error details', () => {
+  const setup = () => {
     const status = jest.fn().mockReturnThis();
     const type = jest.fn().mockReturnThis();
     const json = jest.fn();
     const locals: Record<string, unknown> = {};
-    const filter = new HttpExceptionFilter();
+    const logger = { event: jest.fn() };
+    const filter = new HttpExceptionFilter(logger as unknown as StructuredLogger);
     const host = {
       switchToHttp: () => ({
         getResponse: () => ({ status, type, json, locals }),
       }),
     } as unknown as ArgumentsHost;
+    return { filter, host, status, type, json, locals, logger };
+  };
 
-    filter.catch(
-      new Error('operation failed\npassword: SYNTHETIC_AUDIT_SECRET'),
-      host,
-    );
+  it('logs unhandled errors with name and stack frames but never the message', () => {
+    const { filter, host, status, type, json, locals, logger } = setup();
+    const error = new Error('operation failed\npassword: SYNTHETIC_AUDIT_SECRET');
+
+    filter.catch(error, host);
 
     expect(status).toHaveBeenCalledWith(500);
     expect(type).toHaveBeenCalledWith('application/problem+json');
@@ -27,6 +32,29 @@ describe('HttpExceptionFilter', () => {
       code: 'INTERNAL_SERVER_ERROR',
     });
     expect(locals.publicErrorCode).toBe('INTERNAL_SERVER_ERROR');
-    expect(locals.errorStack).toBeUndefined();
+    expect(logger.event).toHaveBeenCalledTimes(1);
+    const [level, event, fields] = logger.event.mock.calls[0] as [string, string, Record<string, unknown>];
+    expect(level).toBe('error');
+    expect(event).toBe('http.request.unhandled');
+    expect(fields).toMatchObject({ code: 'INTERNAL_SERVER_ERROR', errorName: 'Error' });
+    expect(JSON.stringify(fields)).not.toContain('SYNTHETIC_AUDIT_SECRET');
+    expect(String(fields['errorStack']).split('\n').every((line) => line.startsWith('    at '))).toBe(true);
+  });
+
+  it('logs field pointers without values for validation errors', () => {
+    const { filter, host, status, logger, locals } = setup();
+    const exception = new BadRequestException({
+      message: [
+        { property: 'amount', constraints: { isPositive: 'amount must be positive' }, value: -42 },
+        { property: 'amount', constraints: { min: 'amount too small' }, value: -42 },
+      ],
+    });
+
+    filter.catch(exception, host);
+
+    expect(status).toHaveBeenCalledWith(400);
+    expect(locals.invalidFields).toBe('#/amount');
+    expect(logger.event).not.toHaveBeenCalled();
+    expect(JSON.stringify(locals)).not.toContain('-42');
   });
 });

src/common/filters/http-exception.filter.ts

@@ -10,9 +10,12 @@ import {
 } from '@nestjs/common';
 
 import { HttpErrorCode } from '../error-code';
+import { StructuredLogger } from '../logging/structured-logger.service';
 
 @Catch()
 export class HttpExceptionFilter implements ExceptionFilter {
+  constructor(private readonly logger: StructuredLogger) {}
+
   catch(exception: unknown, host: ArgumentsHost): void {
     const context = host.switchToHttp();
     const response = context.getResponse<Response>();
@@ -31,6 +34,18 @@ export class HttpExceptionFilter implements ExceptionFilter {
       : this.codeFor(status, payload);
     response.locals ??= {};
     response.locals.publicErrorCode = code;
+    if (isValidation) {
+      response.locals.invalidFields = [
+        ...new Set(
+          this.validationErrors(
+            (payload as { message: ValidationError[] }).message,
+          ).map((error) => error.pointer),
+        ),
+      ].join(',');
+    }
+    if (!(exception instanceof HttpException)) {
+      this.logUnhandled(exception, code);
+    }
     response
       .status(status)
       .type('application/problem+json')
@@ -47,6 +62,20 @@ export class HttpExceptionFilter implements ExceptionFilter {
       });
   }
 
+  // ponytail: stack содержит текст message в первой строке; оставляем только кадры, message не пишем.
+  private logUnhandled(exception: unknown, code: string): void {
+    const error = exception instanceof Error ? exception : undefined;
+    const frames = (error?.stack ?? '')
+      .split('\n')
+      .filter((line) => line.startsWith('    at '))
+      .join('\n');
+    this.logger.event('error', 'http.request.unhandled', {
+      code,
+      errorName: error?.name ?? typeof exception,
+      errorStack: frames,
+    });
+  }
+
   private codeFor(status: number, payload: unknown): string {
     if (typeof payload === 'object' && payload !== null && 'code' in payload) {
       const code = (payload as { code?: unknown }).code;

src/common/logging/logging.module.ts

@@ -24,6 +24,7 @@ function completion(request: Request, response: Response, value: { responseTime:
     status: response.statusCode,
     durationMs: Math.round(value.responseTime),
     ...(typeof response.locals.publicErrorCode === 'string' ? { code: response.locals.publicErrorCode } : {}),
+    ...(typeof response.locals.invalidFields === 'string' ? { invalidFields: response.locals.invalidFields } : {}),
   };
 }
 
@@ -31,6 +32,10 @@ export function loggingOptions(config: ConfigService<Environment, true>): Option
   return {
     level: config.getOrThrow('LOG_LEVEL'),
     messageKey: 'message',
+    // ponytail: development-only pretty output; production never loads pino-pretty.
+    ...(process.env['NODE_ENV'] === 'development'
+      ? { transport: { target: 'pino-pretty', options: { colorize: true, singleLine: true, messageKey: 'message' } } }
+      : {}),
     genReqId: (_request, response) => {
       const id = randomUUID();
       response.setHeader('X-Request-ID', id);

src/common/logging/structured-logger.service.ts

@@ -14,9 +14,12 @@ const allowedFields = new Set([
   'count',
   'durationMs',
   'environment',
+  'errorName',
+  'errorStack',
   'found',
   'grpcCode',
   'headersReceived',
+  'invalidFields',
   'method',
   'networkMs',
   'operation',

src/main.ts

@@ -37,7 +37,7 @@ export function configureApp(app: INestApplication): void {
       exceptionFactory: (message) => new BadRequestException({ message }),
     }),
   );
-  app.useGlobalFilters(new HttpExceptionFilter());
+  app.useGlobalFilters(new HttpExceptionFilter(app.get(StructuredLogger)));
   app.enableShutdownHooks();
 }