Colby McHenryandClaude Fable 5
02430ccc32
- effects.ts implicitResponseStatus: a body-sending reply with no status in its chain (res.json / send / render, reply.send, c.json, NextResponse.json, JSONResponse / jsonify / render_template, Rails render, Laravel response()->json) is a 200; a variable status, end, sendStatus and redirects stay as they were - branch-guards callSiteInTree: a status set by the statement just before the reply (`res.status(202); res.json(user)`) is that reply's — looked back within the block, only a statement that IS the status call counts - steps.ts: explicit chain/args → set-before → implicit 200 - express.ts: an inline handler's reply calls (`res.status(404).json(…)`, `res.json(user)`) are references at their own line and column instead of framework noise, so the route's own reply box exists - tests: servers fixture (inline route's 200 beside the service's 404; a 202 set before), ui-effects - CHANGELOG Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01REFyW9hmNrxhwN5wxRoAkC
456 lines
22 KiB
TypeScript
456 lines
22 KiB
TypeScript
/**
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* `GET /api/steps` on servers: an Express API, a NestJS API, a FastAPI service
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* and a Spring controller, in one indexed fixture, shaped to cross every
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* boundary an endpoint's picture has — the request and what runs before the
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* handler, the database, a queue, an email, and the responses with their
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* status codes. Mirrors `ui-steps-api.test.ts` (the mobile app).
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*/
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import { describe, it, expect, beforeAll, afterAll } from 'vitest';
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import * as fs from 'fs';
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import * as os from 'os';
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import * as path from 'path';
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import { CodeGraph } from '../src';
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import { initGrammars, loadAllGrammars } from '../src/extraction/grammars';
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import { buildSteps, projectKind } from '../src/ui-server/api/steps';
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import { routeRoots } from '../src/ui-server/api/route-roots';
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let tmpDir: string;
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let cg: CodeGraph;
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function write(rel: string, content: string): void {
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const full = path.join(tmpDir, rel);
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fs.mkdirSync(path.dirname(full), { recursive: true });
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fs.writeFileSync(full, content);
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}
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beforeAll(async () => {
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await initGrammars();
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await loadAllGrammars();
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tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-ui-steps-servers-'));
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write(
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'package.json',
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JSON.stringify({ name: 'api', dependencies: { express: '4', '@nestjs/core': '10', '@nestjs/common': '10', bullmq: '5', '@prisma/client': '5', typeorm: '0.3' } })
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);
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// ---- Express: a named handler behind middleware, and an inline handler.
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write('src/server/db.ts', "import { PrismaClient } from '@prisma/client'\nexport const prisma = new PrismaClient()\n");
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write('src/server/queue.ts', "import { Queue } from 'bullmq'\nexport const emailQueue = new Queue('email')\n");
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write('src/server/errors.ts', 'export class NotFoundError extends Error {}\n');
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write('src/server/auth.ts', 'export function authenticate(req, res, next) {\n next()\n}\n');
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write('src/server/validate.ts', 'export function validate(schema) {\n return (req, res, next) => next()\n}\n');
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write(
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'src/server/users.service.ts',
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"import { prisma } from './db'\n" +
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"import { emailQueue } from './queue'\n" +
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"import { NotFoundError } from './errors'\n" +
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'export async function createUser(req, res) {\n' +
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' const user = await prisma.user.create({ data: { email: req.body.email, name: req.body.name } })\n' +
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" await emailQueue.add('welcome', { userId: user.id })\n" +
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' if (!user.verified) {\n' +
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' await sendVerification(user)\n' +
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' }\n' +
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' res.status(201).json(user)\n' +
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'}\n' +
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'export async function getUser(id: string) {\n' +
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' const user = await prisma.user.findUnique({ where: { id } })\n' +
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" if (!user) throw new NotFoundError('no such user')\n" +
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' return user\n' +
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'}\n' +
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'async function sendVerification(user) {\n' +
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' await transporter.sendMail({ to: user.email })\n' +
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'}\n' +
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'export async function acceptUser(req, res) {\n' +
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' const user = await prisma.user.update({ where: { id: req.params.id }, data: { accepted: true } })\n' +
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' res.status(202)\n' +
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' res.json(user)\n' +
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'}\n'
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);
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write(
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'src/server/users.routes.ts',
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"import { Router } from 'express'\n" +
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"import { authenticate } from './auth'\n" +
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"import { validate } from './validate'\n" +
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"import { createUser, getUser, acceptUser } from './users.service'\n" +
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'const router = Router()\n' +
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"router.post('/users', authenticate, validate(userSchema), createUser)\n" +
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"router.post('/users/:id/accept', authenticate, acceptUser)\n" +
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"router.get('/users/:id', authenticate, async (req, res) => {\n" +
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' const user = await getUser(req.params.id)\n' +
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' res.json(user)\n' +
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'})\n' +
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'export default router\n'
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);
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// ---- NestJS: guards on the class and the method, DI into a service, a queue consumer.
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write(
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'src/nest/cats.service.ts',
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"import { Injectable } from '@nestjs/common'\n" +
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"import { InjectRepository } from '@nestjs/typeorm'\n" +
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"import { Repository } from 'typeorm'\n" +
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"import { InjectQueue } from '@nestjs/bullmq'\n" +
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"import { Queue } from 'bullmq'\n" +
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"import { Cat } from './cat.entity'\n" +
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'@Injectable()\n' +
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'export class CatsService {\n' +
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' constructor(\n' +
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' @InjectRepository(Cat) private readonly catsRepository: Repository<Cat>,\n' +
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" @InjectQueue('cats') private readonly catsQueue: Queue\n" +
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' ) {}\n' +
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' async create(dto) {\n' +
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' const cat = await this.catsRepository.save(dto)\n' +
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" await this.catsQueue.add('index', { id: cat.id })\n" +
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' return cat\n' +
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' }\n' +
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' async findOne(id: string) {\n' +
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' return this.catsRepository.findOne({ where: { id } })\n' +
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' }\n' +
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'}\n'
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);
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write('src/nest/cat.entity.ts', "import { Entity } from 'typeorm'\n@Entity()\nexport class Cat {\n id: string\n}\n");
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write(
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'src/nest/cats.controller.ts',
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"import { Controller, Get, Post, Body, Param, UseGuards, NotFoundException } from '@nestjs/common'\n" +
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"import { AuthGuard } from '@nestjs/passport'\n" +
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"import { CatsService } from './cats.service'\n" +
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"import { RolesGuard } from './roles.guard'\n" +
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"@Controller('cats')\n" +
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"@UseGuards(AuthGuard('jwt'))\n" +
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'export class CatsController {\n' +
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' constructor(private readonly catsService: CatsService) {}\n' +
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' @Post()\n' +
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' @UseGuards(RolesGuard)\n' +
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' async create(@Body() dto: CreateCatDto) {\n' +
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' return this.catsService.create(dto)\n' +
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' }\n' +
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" @Get(':id')\n" +
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" async findOne(@Param('id') id: string) {\n" +
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' const cat = await this.catsService.findOne(id)\n' +
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" if (!cat) throw new NotFoundException('no cat')\n" +
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' return cat\n' +
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' }\n' +
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'}\n'
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);
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write('src/nest/roles.guard.ts', "import { Injectable } from '@nestjs/common'\n@Injectable()\nexport class RolesGuard {\n canActivate() { return true }\n}\n");
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write(
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'src/nest/cats.processor.ts',
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"import { Processor, Process } from '@nestjs/bull'\n" +
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"@Processor('cats')\n" +
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'export class CatsProcessor {\n' +
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" @Process('index')\n" +
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' async handleIndex(job) {\n' +
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' await searchClient.index(job.data)\n' +
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' }\n' +
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'}\n'
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);
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// ---- FastAPI: a dependency on the route, SQLModel, an HTTPException, a Celery task.
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write(
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'api/items.py',
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'from fastapi import APIRouter, Depends, HTTPException\n' +
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'from sqlmodel import select\n' +
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'from .deps import get_current_user, SessionDep\n' +
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'from .models import Item, ItemCreate\n' +
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'from .tasks import send_welcome\n' +
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'\n' +
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'router = APIRouter()\n' +
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'\n' +
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'@router.post("/items", dependencies=[Depends(get_current_user)])\n' +
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'def create_item(session: SessionDep, item_in: ItemCreate):\n' +
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' item = Item.model_validate(item_in)\n' +
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' session.add(item)\n' +
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' session.commit()\n' +
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' if item.price < 0:\n' +
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' raise HTTPException(status_code=422, detail="bad price")\n' +
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' send_welcome.delay(item.id)\n' +
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' return item\n'
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);
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write('api/deps.py', 'def get_current_user():\n return None\n\nSessionDep = None\n');
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write('api/models.py', 'class Item:\n pass\n\nclass ItemCreate:\n pass\n');
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write('api/tasks.py', 'from celery import shared_task\n\n@shared_task\ndef send_welcome(item_id):\n return item_id\n');
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// A router with its own prefix, included by an aggregate router, mounted at a literal prefix — and one at a computed one.
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write(
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'api/orders.py',
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'from fastapi import APIRouter\n' +
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'\n' +
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'router = APIRouter(prefix="/orders", tags=["orders"])\n' +
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'\n' +
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'@router.get("/")\n' +
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'def list_orders():\n' +
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' return []\n' +
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'\n' +
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'@router.get("/{order_id}")\n' +
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'def get_order(order_id: int):\n' +
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' return order_id\n'
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);
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write('api/v1.py', 'from fastapi import APIRouter\nfrom .orders import router as orders_router\napi_router = APIRouter()\napi_router.include_router(orders_router)\n');
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write(
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'api/main.py',
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'from fastapi import FastAPI\nfrom .items import router\nfrom .v1 import api_router\nfrom .config import settings\napp = FastAPI()\napp.include_router(router)\napp.include_router(api_router, prefix="/api/v1")\napp.include_router(api_router, prefix=settings.LEGACY)\n'
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);
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write('api/config.py', 'settings = None\n');
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write('requirements.txt', 'fastapi\nsqlmodel\ncelery\n');
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// ---- Spring: a repository typed on a field, ResponseEntity replies, a guard annotation.
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write(
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'src/main/java/demo/OwnerController.java',
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'package demo;\n' +
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'import org.springframework.web.bind.annotation.*;\n' +
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'import org.springframework.http.*;\n' +
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'@RestController\n' +
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'@RequestMapping("/owners")\n' +
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'public class OwnerController {\n' +
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' private final OwnerRepository owners;\n' +
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' public OwnerController(OwnerRepository owners) { this.owners = owners; }\n' +
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' @PostMapping("/new")\n' +
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' @PreAuthorize("hasRole(\'ADMIN\')")\n' +
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' public ResponseEntity<Owner> create(@RequestBody Owner owner) {\n' +
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' if (owner.getName() == null) {\n' +
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' return ResponseEntity.badRequest().build();\n' +
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' }\n' +
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' Owner saved = owners.save(owner);\n' +
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' return ResponseEntity.status(HttpStatus.CREATED).body(saved);\n' +
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' }\n' +
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'}\n'
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);
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write(
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'src/main/java/demo/OwnerRepository.java',
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'package demo;\nimport org.springframework.data.jpa.repository.JpaRepository;\npublic interface OwnerRepository extends JpaRepository<Owner, Integer> {\n}\n'
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);
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write('src/main/java/demo/Owner.java', 'package demo;\npublic class Owner {\n private String name;\n public String getName() { return name; }\n}\n');
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// ---- ASP.NET Minimal API, endpoint-group style: the class is the group,
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// the handler is the first argument, the app's extension supplies `/api/`.
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write(
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'src/Web/Endpoints/TodoItems.cs',
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'using Microsoft.AspNetCore.Http.HttpResults;\n' +
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'namespace Demo.Web.Endpoints;\n' +
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'public class TodoItems : IEndpointGroup\n' +
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'{\n' +
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' public static void Map(RouteGroupBuilder groupBuilder)\n' +
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' {\n' +
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' groupBuilder.RequireAuthorization();\n' +
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' groupBuilder.MapPost(CreateTodoItem);\n' +
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' groupBuilder.MapPut(UpdateTodoItem, "{id}");\n' +
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' }\n' +
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' public static async Task<Created<int>> CreateTodoItem(ISender sender, CreateTodoItemCommand command)\n' +
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' {\n' +
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' var id = await sender.Send(command);\n' +
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' return TypedResults.Created($"/{nameof(TodoItems)}/{id}", id);\n' +
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' }\n' +
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' public static async Task<Results<NoContent, BadRequest>> UpdateTodoItem(ISender sender, int id, UpdateTodoItemCommand command)\n' +
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' {\n' +
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' if (id != command.Id)\n' +
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' return TypedResults.BadRequest();\n' +
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' await sender.Send(command);\n' +
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' return TypedResults.NoContent();\n' +
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' }\n' +
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'}\n'
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);
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write(
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'src/Web/Infrastructure/WebApplicationExtensions.cs',
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'using Microsoft.AspNetCore.Builder;\n' +
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'namespace Demo.Web.Infrastructure;\n' +
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'public static class WebApplicationExtensions\n' +
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'{\n' +
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' public static WebApplication MapEndpoints(this WebApplication app)\n' +
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' {\n' +
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' var groupName = "x";\n' +
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' var group = app.MapGroup($"/api/{groupName}").WithTags(groupName);\n' +
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' return app;\n' +
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' }\n' +
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'}\n'
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);
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cg = CodeGraph.initSync(tmpDir);
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await cg.indexAll();
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});
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afterAll(() => {
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cg?.close();
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if (tmpDir) fs.rmSync(tmpDir, { recursive: true, force: true });
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});
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const q = (params: Record<string, string>) => new URLSearchParams(params);
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const route = (name: string) => {
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const r = cg.getNodesByKind('route').find((r) => r.name === name);
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if (!r) throw new Error(`no route ${name}: ${cg.getNodesByKind('route').map((r) => r.name).join(', ')}`);
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return r;
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};
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const effect = (p: Awaited<ReturnType<typeof buildSteps>>, category: string) => p.steps.find((s) => s.kind === 'effect' && s.effect?.category === category);
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describe('route roots', () => {
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it('names the handler an API route runs, the route itself for an inline handler', () => {
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const roots = routeRoots(cg, cg.getNodesByKind('route'));
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expect(roots.get(route('POST /users').id)).toMatchObject({ inline: false, node: { name: 'createUser' } });
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expect(roots.get(route('GET /users/:id').id)).toMatchObject({ inline: true });
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expect(roots.get(route('POST /cats').id)?.node.qualifiedName).toContain('CatsController');
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expect(roots.get(route('POST /items').id)?.node.name).toBe('create_item');
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expect(roots.get(route('POST /owners/new').id)?.node.name).toBe('create');
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});
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it('calls the project an API', () => {
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expect(projectKind(cg.getNodesByKind('route'), 0)).toBe('api');
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});
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});
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describe('Express', () => {
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it('draws the handler’s database write, the queue job, the email, and the 201 — after the middleware', async () => {
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const p = await buildSteps(cg, tmpDir, q({ anchor: route('POST /users').id }));
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expect(p.project).toBe('api');
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const anchor = p.steps.find((s) => s.anchor)!;
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expect(anchor.kind).toBe('screen');
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expect(anchor.sub).toBe('createUser');
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expect(anchor.screen).toMatchObject({ path: 'POST /users', endpoint: true, inline: false, component: { name: 'createUser' } });
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expect(anchor.trigger).toEqual({ kind: 'request', name: 'POST', of: '/users', in: 'users.routes.ts', after: ['authenticate', 'validate(…)'] });
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const db = effect(p, 'database')!;
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expect(db.label).toBe('prisma.user.create({ data })');
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expect(db.effect).toMatchObject({ model: 'user', access: 'write', by: { name: 'createUser' } });
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expect(db.sub).toBe('database · user · write · createUser');
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const queue = effect(p, 'queue')!;
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expect(queue.label).toBe("emailQueue.add('welcome', { userId })");
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const mail = effect(p, 'email')!;
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expect(mail.label).toBe('transporter.sendMail({ to })');
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const mailLink = p.links.find((l) => l.to === mail.id)!;
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expect(mailLink.via.map((v) => v.name)).toEqual(['sendVerification']);
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expect(mailLink.when).toBe('!user.verified');
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const res = effect(p, 'response')!;
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expect(res.label).toBe('201');
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expect(res.effect?.statuses).toEqual([201]);
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const resLink = p.links.find((l) => l.to === res.id)!;
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expect(resLink.sites[0]).toMatchObject({ text: 'res.status(201).json', args: 'user', status: 201 });
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});
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it('walks an inline handler as the route itself, into the service’s read and its 404', async () => {
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const p = await buildSteps(cg, tmpDir, q({ anchor: route('GET /users/:id').id }));
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const anchor = p.steps.find((s) => s.anchor)!;
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expect(anchor.sub).toBe('inline handler · users.routes.ts');
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expect(anchor.trigger).toMatchObject({ kind: 'request', name: 'GET', of: '/users/:id', after: ['authenticate'] });
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const db = effect(p, 'database')!;
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expect(db.effect).toMatchObject({ model: 'user', access: 'read', by: { name: 'getUser' } });
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// `res.json(user)` in the inline handler sets no status: a 200, the
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// route's own reply box; the service's `NotFoundError` is `getUser`'s box.
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const replies = p.steps.filter((s) => s.kind === 'effect' && s.effect?.category === 'response');
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expect(replies.map((s) => [s.effect!.by.name, s.label]).sort()).toEqual([
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['GET /users/:id', '200'],
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['getUser', '404'],
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]);
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const own = replies.find((s) => s.effect!.by.name === 'GET /users/:id')!;
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expect(p.links.find((l) => l.to === own.id)!.sites[0]).toMatchObject({ text: 'res.json', args: 'user', status: 200 });
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const notFound = replies.find((s) => s.effect!.by.name === 'getUser')!;
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const link = p.links.find((l) => l.to === notFound.id)!;
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expect(link.sites[0]).toMatchObject({ text: 'NotFoundError', status: 404, when: '!user' });
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expect(link.via.map((v) => v.name)).toEqual(['getUser']);
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});
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it('a status set by the statement before the reply is that reply’s, not a 200', async () => {
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const p = await buildSteps(cg, tmpDir, q({ anchor: route('POST /users/:id/accept').id }));
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const res = effect(p, 'response')!;
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expect(res.label).toBe('202');
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expect(p.links.find((l) => l.to === res.id)!.sites.map((x) => [x.text, x.status])).toEqual([
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['res.status', 202],
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['res.json', 202],
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]);
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});
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});
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describe('NestJS', () => {
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it('reads the guards on the class and the method, follows DI into the repository and the queue', async () => {
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const p = await buildSteps(cg, tmpDir, q({ anchor: route('POST /cats').id }));
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const anchor = p.steps.find((s) => s.anchor)!;
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expect(anchor.sub).toBe('create');
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expect(anchor.trigger).toEqual({ kind: 'request', name: 'POST', of: '/cats', in: 'cats.controller.ts', after: ["UseGuards(AuthGuard('jwt'))", 'UseGuards(RolesGuard)'] });
|
||
const db = effect(p, 'database')!;
|
||
expect(db.label).toBe('this.catsRepository.save(dto)');
|
||
expect(db.effect).toMatchObject({ model: 'cats', access: 'write', by: { name: 'create' } });
|
||
const dbLink = p.links.find((l) => l.to === db.id)!;
|
||
expect(dbLink.via.map((v) => v.name)).toEqual(['create']);
|
||
// The job put on the `cats` queue lands on the processor that consumes it
|
||
// — an arrival, not a call outside the index; the site is the `add` as written.
|
||
expect(effect(p, 'queue')).toBeUndefined();
|
||
const landing = p.steps.find((s) => s.kind === 'event' && s.node?.name === 'handleIndex')!;
|
||
expect(landing).toBeDefined();
|
||
expect(landing.event).toBe('index');
|
||
expect(landing.trigger).toEqual({ kind: 'decorator', name: 'Process', of: "'index'", in: 'cats.processor.ts' });
|
||
const toLanding = p.links.find((l) => l.to === landing.id)!;
|
||
expect(toLanding.kind).toBe('event');
|
||
expect(toLanding.synthesized).toBe(true);
|
||
expect(toLanding.sites[0]).toMatchObject({ text: 'this.catsQueue.add', args: "'index', { id }" });
|
||
expect(toLanding.label).toBe('via queue-job · job index · queue cats · registered at src/nest/cats.processor.ts:4');
|
||
});
|
||
|
||
it('a thrown exception is the 404 the request gets', async () => {
|
||
const p = await buildSteps(cg, tmpDir, q({ anchor: route('GET /cats/:id').id }));
|
||
const res = effect(p, 'response')!;
|
||
expect(res.label).toBe('404');
|
||
const resLink = p.links.find((l) => l.to === res.id)!;
|
||
expect(resLink.sites[0]).toMatchObject({ text: 'NotFoundException', args: "'no cat'", status: 404, when: '!cat' });
|
||
expect(effect(p, 'database')?.effect).toMatchObject({ access: 'read' });
|
||
});
|
||
|
||
it('a queue consumer says the job that fires it', async () => {
|
||
const p = await buildSteps(cg, tmpDir, q({ symbol: 'handleIndex' }));
|
||
expect(p.steps.find((s) => s.anchor)?.trigger).toEqual({ kind: 'decorator', name: 'Process', of: "'index'", in: 'cats.processor.ts' });
|
||
});
|
||
});
|
||
|
||
describe('FastAPI', () => {
|
||
it('names a mounted router’s routes by the path a request takes — the include prefix, then the router’s own', () => {
|
||
const names = cg.getNodesByKind('route').map((r) => r.name);
|
||
expect(names).toContain('GET /api/v1/orders');
|
||
expect(names).toContain('GET /api/v1/orders/{order_id}');
|
||
expect(names).toContain('POST /items');
|
||
expect(names).not.toContain('GET /');
|
||
});
|
||
|
||
it('reads the dependency on the route, the session writes, the 422 and the Celery task', async () => {
|
||
const p = await buildSteps(cg, tmpDir, q({ anchor: route('POST /items').id }));
|
||
const anchor = p.steps.find((s) => s.anchor)!;
|
||
expect(anchor.sub).toBe('create_item');
|
||
expect(anchor.trigger).toEqual({ kind: 'request', name: 'POST', of: '/items', in: 'items.py', after: ['Depends(get_current_user)'] });
|
||
const db = effect(p, 'database')!;
|
||
expect(db.effect?.apis).toEqual(['session.add', 'session.commit']);
|
||
expect(db.effect).toMatchObject({ access: 'write' });
|
||
const res = effect(p, 'response')!;
|
||
expect(res.label).toBe('422');
|
||
const resLink = p.links.find((l) => l.to === res.id)!;
|
||
expect(resLink.sites[0]).toMatchObject({ text: 'HTTPException', args: 'status_code=422, detail="bad price"', status: 422, when: 'item.price < 0' });
|
||
const queue = effect(p, 'queue')!;
|
||
expect(queue.label).toBe('send_welcome.delay(item.id)');
|
||
});
|
||
});
|
||
|
||
describe('ASP.NET endpoint groups', () => {
|
||
it('names the group’s routes under the app’s /api/ head and starts the walk at the handler, with its replies', async () => {
|
||
const names = cg.getNodesByKind('route').map((r) => r.name);
|
||
expect(names).toContain('POST /api/TodoItems');
|
||
expect(names).toContain('PUT /api/TodoItems/{id}');
|
||
const p = await buildSteps(cg, tmpDir, q({ anchor: route('PUT /api/TodoItems/{id}').id }));
|
||
const anchor = p.steps.find((s) => s.anchor)!;
|
||
expect(anchor.sub).toBe('UpdateTodoItem');
|
||
expect(anchor.trigger).toMatchObject({ kind: 'request', name: 'PUT', of: '/api/TodoItems/{id}' });
|
||
const res = effect(p, 'response')!;
|
||
expect(res.label).toBe('204 · 400');
|
||
const rows = p.links.find((l) => l.to === res.id)!.sites.map((s) => [s.status, s.when]);
|
||
expect(rows).toEqual([
|
||
[400, 'id != command.Id'],
|
||
[204, 'id == command.Id'],
|
||
]);
|
||
});
|
||
});
|
||
|
||
describe('Spring', () => {
|
||
it('types the repository off the field, reads the annotation guard, and both replies with their codes', async () => {
|
||
const p = await buildSteps(cg, tmpDir, q({ anchor: route('POST /owners/new').id }));
|
||
const anchor = p.steps.find((s) => s.anchor)!;
|
||
expect(anchor.sub).toBe('create');
|
||
expect(anchor.trigger).toEqual({ kind: 'request', name: 'POST', of: '/owners/new', in: 'OwnerController.java', after: ["PreAuthorize(\"hasRole('ADMIN')\")"] });
|
||
const db = effect(p, 'database')!;
|
||
expect(db.label).toBe('owners.save(owner)');
|
||
expect(db.effect).toMatchObject({ model: 'Owner', access: 'write' });
|
||
const dbLink = p.links.find((l) => l.to === db.id)!;
|
||
expect(dbLink.when).toBe('owner.getName() != null');
|
||
const res = effect(p, 'response')!;
|
||
expect(res.label).toBe('201 · 400');
|
||
const rows = p.links.find((l) => l.to === res.id)!.sites.map((s) => [s.status, s.when]);
|
||
expect(rows).toEqual([
|
||
[400, 'owner.getName() == null'],
|
||
[201, 'owner.getName() != null'],
|
||
]);
|
||
});
|
||
});
|