refactor: flatten monorepo into standalone project

src/server/api/context.ts

@@ -0,0 +1,25 @@
+import type { DB } from '@/server/db'
+
+/**
+ * 基础 Context - 所有请求都包含的上下文
+ */
+export interface BaseContext {
+  headers: Headers
+}
+
+/**
+ * 数据库 Context - 通过 db middleware 扩展
+ */
+export interface DBContext extends BaseContext {
+  db: DB
+}
+
+/**
+ * 认证 Context - 通过 auth middleware 扩展（未来使用）
+ *
+ * @example
+ * export interface AuthContext extends DBContext {
+ *   userId: string
+ *   user: User
+ * }
+ */

src/server/api/contracts/index.ts

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+import * as todo from './todo.contract'
+
+export const contract = {
+  todo,
+}
+
+export type Contract = typeof contract

src/server/api/contracts/todo.contract.ts

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+import { oc } from '@orpc/contract'
+import { createInsertSchema, createSelectSchema, createUpdateSchema } from 'drizzle-orm/zod'
+import { z } from 'zod'
+import { generatedFieldKeys } from '@/server/db/fields'
+import { todoTable } from '@/server/db/schema'
+
+const selectSchema = createSelectSchema(todoTable)
+
+const insertSchema = createInsertSchema(todoTable).omit(generatedFieldKeys)
+
+const updateSchema = createUpdateSchema(todoTable).omit(generatedFieldKeys)
+
+export const list = oc.input(z.void()).output(z.array(selectSchema))
+
+export const create = oc.input(insertSchema).output(selectSchema)
+
+export const update = oc
+  .input(
+    z.object({
+      id: z.uuid(),
+      data: updateSchema,
+    }),
+  )
+  .output(selectSchema)
+
+export const remove = oc
+  .input(
+    z.object({
+      id: z.uuid(),
+    }),
+  )
+  .output(z.void())

src/server/api/interceptors.ts

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+import { ORPCError, ValidationError } from '@orpc/server'
+import { z } from 'zod'
+
+export const logError = (error: unknown) => {
+  console.error(error)
+}
+
+export const handleValidationError = (error: unknown) => {
+  if (error instanceof ORPCError && error.code === 'BAD_REQUEST' && error.cause instanceof ValidationError) {
+    // If you only use Zod you can safely cast to ZodIssue[] (per ORPC official docs)
+    const zodError = new z.ZodError(error.cause.issues as z.core.$ZodIssue[])
+
+    throw new ORPCError('INPUT_VALIDATION_FAILED', {
+      status: 422,
+      message: z.prettifyError(zodError),
+      data: z.flattenError(zodError),
+      cause: error.cause,
+    })
+  }
+
+  if (error instanceof ORPCError && error.code === 'INTERNAL_SERVER_ERROR' && error.cause instanceof ValidationError) {
+    throw new ORPCError('OUTPUT_VALIDATION_FAILED', {
+      cause: error.cause,
+    })
+  }
+}

src/server/api/middlewares/db.middleware.ts

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+import { os } from '@/server/api/server'
+import { getDB } from '@/server/db'
+
+export const db = os.middleware(async ({ context, next }) => {
+  return next({
+    context: {
+      ...context,
+      db: getDB(),
+    },
+  })
+})

src/server/api/middlewares/index.ts

@@ -0,0 +1 @@
+export * from './db.middleware'

src/server/api/routers/index.ts

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+import { os } from '../server'
+import * as todo from './todo.router'
+
+export const router = os.router({
+  todo,
+})

src/server/api/routers/todo.router.ts

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+import { ORPCError } from '@orpc/server'
+import { eq } from 'drizzle-orm'
+import { todoTable } from '@/server/db/schema'
+import { db } from '../middlewares'
+import { os } from '../server'
+
+export const list = os.todo.list.use(db).handler(async ({ context }) => {
+  const todos = await context.db.query.todoTable.findMany({
+    orderBy: { createdAt: 'desc' },
+  })
+  return todos
+})
+
+export const create = os.todo.create.use(db).handler(async ({ context, input }) => {
+  const [newTodo] = await context.db.insert(todoTable).values(input).returning()
+
+  if (!newTodo) {
+    throw new ORPCError('INTERNAL_SERVER_ERROR', { message: 'Failed to create todo' })
+  }
+
+  return newTodo
+})
+
+export const update = os.todo.update.use(db).handler(async ({ context, input }) => {
+  const [updatedTodo] = await context.db.update(todoTable).set(input.data).where(eq(todoTable.id, input.id)).returning()
+
+  if (!updatedTodo) {
+    throw new ORPCError('NOT_FOUND')
+  }
+
+  return updatedTodo
+})
+
+export const remove = os.todo.remove.use(db).handler(async ({ context, input }) => {
+  const [deleted] = await context.db.delete(todoTable).where(eq(todoTable.id, input.id)).returning({ id: todoTable.id })
+
+  if (!deleted) {
+    throw new ORPCError('NOT_FOUND')
+  }
+})

src/server/api/server.ts

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+import { implement } from '@orpc/server'
+import type { BaseContext } from './context'
+import { contract } from './contracts'
+
+export const os = implement(contract).$context<BaseContext>()

src/server/api/types.ts

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+import type { ContractRouterClient, InferContractRouterInputs, InferContractRouterOutputs } from '@orpc/contract'
+import type { Contract } from './contracts'
+
+export type RouterClient = ContractRouterClient<Contract>
+export type RouterInputs = InferContractRouterInputs<Contract>
+export type RouterOutputs = InferContractRouterOutputs<Contract>

src/server/db/fields.ts

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+import { sql } from 'drizzle-orm'
+import { timestamp, uuid } from 'drizzle-orm/pg-core'
+import { v7 as uuidv7 } from 'uuid'
+
+// id
+
+const id = (name: string) => uuid(name)
+export const pk = (name: string, strategy?: 'native' | 'extension') => {
+  switch (strategy) {
+    // PG 18+
+    case 'native':
+      return id(name).primaryKey().default(sql`uuidv7()`)
+
+    // PG 13+ with extension
+    case 'extension':
+      return id(name).primaryKey().default(sql`uuid_generate_v7()`)
+
+    // Any PG version
+    default:
+      return id(name)
+        .primaryKey()
+        .$defaultFn(() => uuidv7())
+  }
+}
+
+// timestamp
+
+export const createdAt = (name = 'created_at') => timestamp(name, { withTimezone: true }).notNull().defaultNow()
+
+export const updatedAt = (name = 'updated_at') =>
+  timestamp(name, { withTimezone: true })
+    .notNull()
+    .defaultNow()
+    .$onUpdateFn(() => new Date())
+
+// generated fields
+
+export const generatedFields = {
+  id: pk('id'),
+  createdAt: createdAt('created_at'),
+  updatedAt: updatedAt('updated_at'),
+}
+
+// Helper to create omit keys from generatedFields
+const createGeneratedFieldKeys = <T extends Record<string, unknown>>(fields: T): Record<keyof T, true> => {
+  return Object.keys(fields).reduce(
+    (acc, key) => {
+      acc[key as keyof T] = true
+      return acc
+    },
+    {} as Record<keyof T, true>,
+  )
+}
+
+export const generatedFieldKeys = createGeneratedFieldKeys(generatedFields)

src/server/db/index.ts

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+import { drizzle } from 'drizzle-orm/postgres-js'
+import { env } from '@/env'
+import { relations } from '@/server/db/relations'
+
+export const createDB = () =>
+  drizzle({
+    connection: env.DATABASE_URL,
+    relations,
+  })
+
+export type DB = ReturnType<typeof createDB>
+
+export const getDB = (() => {
+  let db: DB | null = null
+
+  return (singleton = true): DB => {
+    if (!singleton) {
+      return createDB()
+    }
+
+    db ??= createDB()
+    return db
+  }
+})()

src/server/db/relations.ts

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+import { defineRelations } from 'drizzle-orm'
+import * as schema from './schema'
+
+export const relations = defineRelations(schema, (_r) => ({}))

src/server/db/schema/index.ts

@@ -0,0 +1 @@
+export * from './todo'

src/server/db/schema/todo.ts

@@ -0,0 +1,8 @@
+import { boolean, pgTable, text } from 'drizzle-orm/pg-core'
+import { generatedFields } from '../fields'
+
+export const todoTable = pgTable('todo', {
+  ...generatedFields,
+  title: text('title').notNull(),
+  completed: boolean('completed').notNull().default(false),
+})