#1 error handling improved

Signed-off-by: Benny Samir Hierl <bennysamir@posteo.de>

src/api/config/errors/index.ts

@@ -1,3 +1,40 @@
+import { FastifyRequest, FastifyReply, FastifyError } from 'fastify'
+import { Prisma } from '@prisma/client'
+
+const errorIs = (e: unknown, c: string) =>
+  e instanceof Prisma.PrismaClientKnownRequestError && e.code === c
+
+export const defaultErrorHandler = (
+  error: FastifyError,
+  request: FastifyRequest,
+  reply: FastifyReply
+) => {
+  if (error.validation) {
+    error.code = '400'
+    reply.send(error)
+  } else if (errorIs(error, 'P2002')) {
+    reply.send(
+      uniqueKeyError(
+        // @ts-expect-error: Object is possibly 'undefined'
+        `${error.meta.target[0] || 'One of the fields'} has to be unique`
+      )
+    )
+  } else if (errorIs(error, 'P2025')) {
+    reply.callNotFound()
+  } else {
+    request.log.error(error)
+    const e = new httpError('unexpected error', 500, '500')
+    reply.send(e)
+  }
+}
+
+export const notFoundHandler = (
+  request: FastifyRequest,
+  reply: FastifyReply
+) => {
+  reply.send(notFoundError())
+}
+
 class httpError extends Error {
   code: string
   statusCode: number
@@ -10,10 +47,10 @@ class httpError extends Error {
   }
 }
 
-export const notFoundError = () => {
+const notFoundError = () => {
   return new httpError('Not Found', 404, '404')
 }
 
-export const uniqueKeyError = (msg: string, code = '4001') => {
+const uniqueKeyError = (msg: string, code = '4001') => {
   return new httpError(msg, 422, code)
 }

src/api/routes/index.ts

@@ -1,14 +1,13 @@
 import { FastifyInstance } from 'fastify'
 import { default as wishlistRoute } from './wishlist/'
-import { notFoundError } from '../config/errors'
+import { defaultErrorHandler, notFoundHandler } from '../config/errors'
 
 export default {
   register: (app: FastifyInstance) => {
     return app.register(
       async (app) => {
-        app.setNotFoundHandler((request, reply) => {
-          reply.send(notFoundError())
-        })
+        await app.setNotFoundHandler(notFoundHandler)
+        await app.setErrorHandler(defaultErrorHandler)
         await app.register(wishlistRoute, { prefix: '/wishlist' })
       },
       { prefix: '/api' }

src/api/routes/wishlist/create.ts

@@ -1,8 +1,6 @@
 import { Wishlist, WishlistItem } from '@/types'
 import { FastifyRequest, FastifyReply, RouteOptions } from 'fastify'
 import { wishlist } from '../../models'
-import { prisma } from '../../services'
-import { uniqueKeyError } from '../../config/errors'
 import {
   wishlistItemRequestSchema,
   wishlistItemResponseSchema,
@@ -25,13 +23,6 @@ export const createList = <RouteOptions>{
       201: wishlistResponseSchema,
     },
   },
-  errorHandler: (error, request, reply) => {
-    if (error instanceof prisma.errorType && error.code === 'P2002') {
-      return reply.send(uniqueKeyError('Slugtext has to be unique'))
-    }
-    request.log.error(error)
-    reply.send(new Error('Unexptected Error'))
-  },
   handler: async (request: FastifyRequest, reply: FastifyReply) => {
     request.log.debug(request.body)
     const item = await wishlist.create(request.body as Wishlist)
@@ -44,17 +35,16 @@ export const createItem = <RouteOptions>{
   url: '/:wishlistId/item',
   schema: {
     body: wishlistItemRequestSchema,
+    params: {
+      type: 'object',
+      properties: {
+        wishlistId: { type: 'string' },
+      },
+    },
     response: {
       201: wishlistItemResponseSchema,
     },
   },
-  errorHandler: (error, request, reply) => {
-    if (error instanceof prisma.errorType && error.code === 'P2025') {
-      return reply.callNotFound()
-    }
-    request.log.error(error)
-    reply.send(new Error('Unexptected Error'))
-  },
   handler: async (request: createItemRequest, reply: FastifyReply) => {
     request.log.debug(request.body)
     const item = await wishlist.createItem(

src/api/routes/wishlist/update.ts

@@ -1,5 +1,3 @@
-import { uniqueKeyError } from '../../config/errors'
-import { prisma } from '../../services'
 import { Wishlist } from '@/types'
 import { FastifyRequest, FastifyReply, RouteOptions } from 'fastify'
 import { wishlist } from '../../models'
@@ -28,20 +26,16 @@ export const updateList = <RouteOptions>{
   url: '/:wishlistId',
   schema: {
     body: wishlistRequestSchema,
+    params: {
+      type: 'object',
+      properties: {
+        wishlistId: { type: 'string' },
+      },
+    },
     response: {
       200: wishlistResponseSchema,
     },
   },
-  errorHandler: (error, request, reply) => {
-    if (error instanceof prisma.errorType && error.code === 'P2002') {
-      return reply.send(uniqueKeyError('Slugtext has to be unique'))
-    }
-    if (error instanceof prisma.errorType && error.code === 'P2025') {
-      return reply.callNotFound()
-    }
-    request.log.error(error)
-    reply.send(new Error('Unexptected Error'))
-  },
   handler: async (request: updateRequest, reply: FastifyReply) => {
     request.log.debug(request.body)
     const item = await wishlist.update(
@@ -57,20 +51,21 @@ export const updateItem = <RouteOptions>{
   url: '/:wishlistId/item/:itemId',
   schema: {
     body: wishlistItemRequestSchema,
+    params: {
+      type: 'object',
+      properties: {
+        wishlistId: { type: 'string' },
+        itemId: { type: 'number' },
+      },
+    },
     response: {
       200: wishlistItemResponseSchema,
     },
   },
   handler: async (request: updateItemRequest, reply: FastifyReply) => {
     request.log.debug(request.body)
-    const item = await wishlist.updateItem(
-      Number(request.params.itemId),
-      request.body
+    reply.send(
+      await wishlist.updateItem(Number(request.params.itemId), request.body)
     )
-    if (item) {
-      reply.send(item)
-    } else {
-      reply.callNotFound()
-    }
   },
 }

src/api/services/prisma/index.ts

@@ -1,9 +1,7 @@
-import { PrismaClient, Prisma } from '@prisma/client'
+import { PrismaClient } from '@prisma/client'
 
 const client = new PrismaClient()
-const errorType = Prisma.PrismaClientKnownRequestError
 
 export default {
   client,
-  errorType,
 }