Define an exception filter to log the cause of exceptions

src/log-cause.exception-filter.ts

@@ -0,0 +1,24 @@
+import { ArgumentsHost, Catch, Logger } from '@nestjs/common';
+import { BaseRpcExceptionFilter } from '@nestjs/microservices';
+import { Observable } from 'rxjs';
+
+@Catch()
+export class LogCauseExceptionFilter extends BaseRpcExceptionFilter {
+  private static readonly causeLogger = new Logger('RpcExceptionsHandler');
+
+  catch(exception: any, host: ArgumentsHost): Observable<any> {
+    const response = super.catch(exception, host);
+    const cause = exception.cause;
+    if (cause) {
+      if (this.isError(cause)) {
+        LogCauseExceptionFilter.causeLogger.error(
+          'Caused by: ' + cause.message,
+          cause.stack,
+        );
+      } else {
+        LogCauseExceptionFilter.causeLogger.error('Caused by: ' + cause);
+      }
+    }
+    return response;
+  }
+}

src/modules/ad/core/application/queries/match/match.query.ts

@@ -1,9 +1,5 @@
 import { QueryBase } from '@mobicoop/ddd-library';
-import { AlgorithmType } from '../../types/algorithm.types';
-import { Waypoint } from '../../types/waypoint.type';
 import { Frequency, Role } from '@modules/ad/core/domain/ad.types';
-import { MatchRequestDto } from '@modules/ad/interface/grpc-controllers/dtos/match.request.dto';
-import { DateTimeTransformerPort } from '../../ports/datetime-transformer.port';
 import {
   Path,
   PathCreator,
@@ -11,8 +7,12 @@ import {
   TypedRoute,
 } from '@modules/ad/core/domain/path-creator.service';
 import { Point } from '@modules/ad/core/domain/value-objects/point.value-object';
-import { Route } from '../../types/route.type';
+import { MatchRequestDto } from '@modules/ad/interface/grpc-controllers/dtos/match.request.dto';
+import { DateTimeTransformerPort } from '../../ports/datetime-transformer.port';
 import { GeorouterPort } from '../../ports/georouter.port';
+import { AlgorithmType } from '../../types/algorithm.types';
+import { Route } from '../../types/route.type';
+import { Waypoint } from '../../types/waypoint.type';
 
 export class MatchQuery extends QueryBase {
   id?: string;
@@ -227,7 +227,9 @@ export class MatchQuery extends QueryBase {
         }
       });
     } catch (e: any) {
-      throw new Error('Unable to find a route for given waypoints');
+      throw new Error('Unable to find a route for given waypoints', {
+        cause: e,
+      });
     }
     return this;
   };

src/modules/ad/interface/grpc-controllers/match.grpc-controller.ts

@@ -6,12 +6,20 @@ import { MatchingResult } from '@modules/ad/core/application/queries/match/match
 import { MatchEntity } from '@modules/ad/core/domain/match.entity';
 import { MatchMapper } from '@modules/ad/match.mapper';
 import { CacheInterceptor, CacheKey } from '@nestjs/cache-manager';
-import { Controller, Inject, UseInterceptors, UsePipes } from '@nestjs/common';
+import {
+  Controller,
+  Inject,
+  UseFilters,
+  UseInterceptors,
+  UsePipes,
+} from '@nestjs/common';
 import { QueryBus } from '@nestjs/cqrs';
 import { GrpcMethod } from '@nestjs/microservices';
+import { LogCauseExceptionFilter } from '@src/log-cause.exception-filter';
 import { MatchingPaginatedResponseDto } from '../dtos/matching.paginated.response.dto';
 import { MatchRequestDto } from './dtos/match.request.dto';
 
+@UseFilters(LogCauseExceptionFilter)
 @UsePipes(
   new RpcValidationPipe({
     whitelist: false,

tsconfig.json

@@ -7,6 +7,7 @@
     "experimentalDecorators": true,
     "allowSyntheticDefaultImports": true,
     "target": "es2017",
+    "lib": ["es2022"],
     "sourceMap": true,
     "outDir": "./dist",
     "baseUrl": "./",