435 lines
20 KiB
Plaintext
435 lines
20 KiB
Plaintext
# Backend Dev Rules (HTTP API + Model)
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This file condenses `backend/docs/dev/http_api.md` + `backend/docs/dev/model.md` into a checklist/rule format for LLMs.
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---
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## 0) Golden rules (DO / DO NOT)
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- DO follow existing module layout under `backend/app/http/<module>/`.
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- MUST: HTTP module folder name MUST be `snake_case` (e.g. `tenant_public`), not `camelCase`/`mixedCase`.
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- DO keep controller methods thin: parse/bind → call `services.*` → return result/error.
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- DO regenerate code after changes (routes/docs/models).
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- MUST: in `backend/app/services`, prefer the generated GORM-Gen DAO (`backend/database/models/*`) for DB access; treat raw `*gorm.DB` usage as a last resort.
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- MUST: after adding/removing/renaming any files under `backend/app/services/`, run `atomctl gen service --path ./app/services` to regenerate `backend/app/services/services.gen.go`; DO NOT edit `services.gen.go` manually.
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- MUST: a single service's methods MUST live in a single file; do NOT split one service across multiple files (e.g. `type user struct{}` in `user.go` but methods in `user_admin.go`), because `atomctl gen service` uses filenames to infer services and will generate incorrect `services.gen.go`.
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- DO add `// @provider` above every controller/service `struct` declaration.
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- DO keep HTTP middlewares in `backend/app/middlewares/` only.
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- DO keep all `const` declarations in `backend/pkg/consts/` only (do not declare constants elsewhere).
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- DO NOT manually edit generated files:
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- `backend/app/http/**/routes.gen.go`
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- `backend/app/http/**/provider.gen.go`
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- `backend/docs/docs.go`
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- DO NOT manually write provider declarations (only `atomctl gen provider`).
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- DO NOT manually write route declarations (only `atomctl gen route`).
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- DO keep Swagger annotations consistent with actual Fiber route paths (including `:param`).
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- MUST: route path parameter placeholders MUST be `camelCase` (e.g. `:tenantCode`), never `snake_case` (e.g. `:tenant_code`).
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- MUST: when importing another HTTP module's `dto` package, the import alias MUST be `<module>_dto` (e.g. `tenant_dto`), not `<module>dto` (e.g. `tenantdto`).
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- MUST: when creating/generating Go `struct` definitions (DTOs/requests/responses/etc.), add detailed per-field comments describing meaning, usage scenario, and validation/usage rules (do not rely on “self-explanatory” names).
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- MUST: business code comments MUST be written in Chinese (中文注释), to keep review/maintenance consistent across the team.
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- MUST: in `backend/app/services`, add Chinese comments at key steps to explain business intent and invariants (e.g., 事务边界、幂等语义、余额冻结/扣减/回滚、权限/前置条件校验点), avoid “what the code does” boilerplate.
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---
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## 1) Add a new HTTP API endpoint
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### 1.1 Where code lives
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- Controllers: `backend/app/http/<module>/*.go`
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- Example module: `backend/app/http/super/tenant.go`, `backend/app/http/super/user.go`
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- DTOs: `backend/app/http/<module>/dto/*`
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- HTTP middlewares: `backend/app/middlewares/*`
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- Routes (generated): `backend/app/http/<module>/routes.gen.go`
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- Swagger output (generated): `backend/docs/swagger.yaml`, `backend/docs/swagger.json`, `backend/docs/docs.go`
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### 1.2 Controller method signatures
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- “Return data” endpoints: return `(<T>, error)`
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- Example: `(*requests.Pager, error)` for paginated list
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- “No data” endpoints: return `error`
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### 1.3 Swagger annotations (minimum set)
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Place above the handler function:
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- `@Summary`
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- `@Tags`
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- `@Accept json`
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- `@Produce json`
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- `@Param` (query/path/body as needed)
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- `@Success` for 200 responses
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- `@Router <path> [get|post|patch|delete|put]`
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- `@Bind` for parameters (see below)
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Common `@Success` patterns:
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- Paginated list: `requests.Pager{items=dto.Item}`
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- Single object: `dto.Item`
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- Array: `{array} dto.Item`
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### 1.4 Parameter binding (@Bind)
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Format:
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`@Bind <paramName> <position> [key(<key>)] [model(<field>|<type>[:<field>])]`
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Positions:
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- `path`, `query`, `body`, `header`, `cookie`, `local`, `file`
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Notes:
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- `paramName` MUST match function parameter name (case-sensitive).
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- Default key name is `paramName` ; override via `key(...)`.
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- Scalar types: `string/int/int32/int64/float32/float64/bool`.
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- Pointer types are supported (framework will handle deref for most positions).
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#### Model binding (path-only)
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Used to bind a model instance from a path value:
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- `model(id)` (recommended)
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- `model(id:int)` / `model(code:string)`
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- `model(pkg.Type:field)` or `model(pkg.Type)` (default field is `id`)
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Behavior:
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- Generated binder queries by field and returns first row as the parameter value.
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- Auto-imports field helper for query building.
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### 1.5 Generate routes + providers + swagger docs
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Run from `backend/`:
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- Generate routes: `atomctl gen route`
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- Generate providers: `atomctl gen provider`
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- Generate swagger docs: `atomctl swag init`
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### 1.6 Local verify
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- Build/run: `make run`
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- Use REST client examples: `tests/[module]/[controller].http` (extend it for new endpoints)
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### 1.7 Testing
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- Prefer existing test style under `backend/tests/e2e`.
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- Run: `make test`
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### 1.8 Module-level route group (Path + Middlewares)
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If you need to define a module HTTP middleware (applies to the module route group):
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1) Run `atomctl gen route` first.
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2) Edit `backend/app/http/<module>/routes.manual.go`:
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- Update `Path()` to return the current module route group prefix (must match the prefix used in `routes.gen.go`, e.g. `/super/v1`, `/t/:tenantCode/v1`).
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- Update `Middlewares()` return value: return a list like `[]any{r.middlewares.MiddlewareFunc1, r.middlewares.MiddlewareFunc2, ...}` (no `(...)`), where each item is `r.middlewares.<MiddlewareFunc>` referencing middleware definitions in `backend/app/middlewares`.
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---
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## 2) Add / update a DB model
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Models live in:
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- `backend/database/models/*` (generated model code + optional manual extensions)
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### 2.1 Migration → model generation workflow
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1) Create migration:
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- `atomctl migrate create alter_table` or `atomctl migrate create create_table`
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2) Edit migration:
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- No explicit `BEGIN/COMMIT` needed (framework handles).
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- Table name should be plural (e.g. `tenants`).
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- MUST: when writing migration content, every field/column MUST include a brief Chinese remark, and also include commented details for that field’s usage scenario and rules/constraints (e.g., valid range/format, default behavior, special cases).
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3) Apply migration:
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- `atomctl migrate up`
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4) Map complex field types (JSON/ARRAY/UUID/…) via transform file:
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- `backend/database/.transform.yaml` → `field_type.<table>`
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5) Generate models:
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- `atomctl gen model`
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---
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## 3) Service-layer DB access (GORM Gen)
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This project uses a PostgreSQL-focused GORM-Gen variant (`go.ipao.vip/gen` + generated `backend/database/models/*`).
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Reference: `backend/llm.gorm_gen.txt`.
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### 3.1 Query style (preferred)
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- MUST: in services, build queries via:
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- `tbl, q := models.<Table>Query.QueryContext(ctx)`
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- Use type-safe conditions (`tbl.ID.Eq(...)`, `tbl.TenantID.Eq(...)`, `tbl.DeletedAt.IsNull()`, etc).
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- DO NOT: use string SQL in `Where("...")` unless absolutely necessary.
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### 3.2 Transactions
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- MUST: use Gen transaction wrapper so all queries share the same tx connection:
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- `models.Q.Transaction(func(tx *models.Query) error { ... })`
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- Inside tx, use `tx.<Table>.QueryContext(ctx)` / `tx.<Table>.WithContext(ctx)`
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- DO NOT: use `_db.WithContext(ctx).Transaction(...)` in services unless Gen cannot express a required operation.
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### 3.3 Updates
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- Prefer `UpdateSimple(...)` with typed assign expressions when possible.
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- Otherwise use `Updates(map[string]any{...})`, but MUST:
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- include tenant boundary conditions (`tenant_id`) in the WHERE,
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- avoid updating columns by concatenating user input.
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### 3.4 Columns not in generated models (temporary escape hatch)
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If migrations add columns but `atomctl gen model` has not been re-run yet, the typed `models.<Struct>` will not contain those fields.
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In this case:
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- Use `q.UnderlyingDB()` (from Gen DO) to do a narrow query/update (single table, explicit columns).
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- Add a short Chinese comment explaining why, and that `atomctl gen model` should be run when DB is reachable.
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- Avoid spreading this pattern: keep it localized to one function.
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---
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## Async Jobs（River）
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本项目使用 River（`github.com/riverqueue/river`）作为异步任务系统，并通过 `atomctl new job <name> [--cron]` 生成 `backend/app/jobs/*.go`。
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- MUST：任务入队（调用 `job.Add(...)` / `client.Insert(...)`）只能在 `service` / `controller` / `event` 层编写；其它位置（例如 `middlewares` / `database` / `models` / `providers` / `jobs` 的 worker 实现等）禁止写入任务，避免耦合与隐式副作用。
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### Job（一次性任务）
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- `Kind() string`：任务类型标识（job kind）；改名会导致“新旧任务类型不一致”。
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- `InsertOpts() river.InsertOpts`：默认入队参数（队列、优先级、最大重试、唯一任务策略等）。
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- `UniqueID() string`（项目约定）：周期任务 handle 的稳定 key；通常 `return Kind()`。
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### Worker（执行器）
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- `Work(ctx, job)`：执行入口；返回 `nil` 成功；返回 `error` 失败并按 River 策略重试。
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- `river.JobSnooze(d)`：延后再跑一次，且 **不递增 attempt**；适合等待外部依赖就绪/限流等。
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- `river.JobCancel(err)`：永久取消并记录原因；适合业务上永远不可能成功的情况（参数非法/语义过期等）。
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- `NextRetry(job)`（可选）：自定义该任务类型的重试节奏。
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### CronJob（周期任务）
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- `Prepare() error`：注册周期任务前做初始化/校验（避免重活/长阻塞）。
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- `Args() []contracts.CronJobArg`：声明周期任务（间隔、是否启动即跑、入队的 JobArgs）。
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### 业务侧如何入队
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- 在业务结构体中注入 `*job.Job`（见 `backend/providers/job`），然后调用 `obj.job.Add(jobs.XXXJob{...})` 入队。
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### 2.2 Enum strategy
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- DO NOT use native DB ENUM.
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- Define enums in Go under `backend/pkg/consts/<table>.go`, example:
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```go
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// swagger:enum UserStatus
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// ENUM(pending_verify, verified, banned, )
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type UserStatus string
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```
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- For every enum `type` defined under `backend/pkg/consts/`, you MUST also define:
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- `Description() string`: return the Chinese label for the specific enum value (used by API/FE display).
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- `XxxItems() []requests.KV`: return the KV list for FE dropdowns (typically `Key=enum string`, `Value=Description()`). Example: `func TenantStatusItems() []requests.KV` and call it via `consts.TenantStatusItems()`.
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- Prefer `string(t)` as `Key`, and use a stable default label for unknown values (e.g. `未知` / `未知状态`).
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- MUST: `Description()` and `XxxItems()` MUST be placed immediately below the enum `type` definition (same file, directly under `type Xxx string`), to keep the enum self-contained and easy to review.
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- Generate enum code: `atomctl gen enum`
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### 2.3 Supported field types (`gen/types/`)
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`backend/database/.transform.yaml` typically imports `go.ipao.vip/gen` so you can use `types.*` in `field_type`.
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Common types:
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- JSON: `types.JSON`, `types.JSONMap`, `types.JSONType[T]`, `types.JSONSlice[T]`
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### 2.4 JSONB 强类型规则（`types.JSONType[T]`）
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- 如果某个 `jsonb` 字段的数据结构是“确定且稳定”的，优先将 `types.JSON` 升级为 `types.JSONType[fields.TableNameFieldName]`，以获得类型约束与更清晰的读写代码。
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- `fields.TableNameFieldName` 必须定义在 `backend/database/fields/[table_name].go` 中，格式为 `type TableNameFieldName struct { ... }` 并为每个字段写好 `json` tag。
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- 如果数据结构“不确定/随业务演进/允许任意键”，继续使用 `types.JSON`（不要强行 JSONType，以免丢字段或引入频繁迁移）。
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- 服务层读写 `types.JSONType[T]`：
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- 读取：`v := model.Field.Data()`
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- 修改：`model.Field.Edit(func(v *T) { ... })` 或 `model.Field.Set(newValue)`
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### 2.5 一个字段多种结构（判别联合）
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- 当同一个 `jsonb` 字段存在多种不同结构（同一字段承载多个 payload），不要让字段类型漂移为 `any/map`。
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- 推荐统一包裹为“判别联合”结构：`type Xxx struct { Kind string; Data json.RawMessage }`，并将该字段映射为 `types.JSONType[fields.Xxx]`。
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- 写入时：
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- `Kind` 建议与业务枚举/事件类型对齐，便于 SQL/报表按 `kind` 过滤。
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- `Data` 写入对应 payload 的 JSON（payload 可以是多个不同 struct）。
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- 读取时：
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- 先 `snap := model.Snapshot.Data()`，再 `switch snap.Kind` 选择对应 payload 结构去 `json.Unmarshal(snap.Data, &payload)`。
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- 兼容历史数据（旧 JSON 没有 kind/data）时，`UnmarshalJSON` 可以将其标记为 `legacy` 并把原始 JSON 放入 `Data`，避免线上存量读取失败。
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---
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## 4) 审计与幂等（通用）
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- 若你为任意表新增结构化审计字段（例如 `operator_user_id`、`biz_ref_type/biz_ref_id`），服务层写入必须同步补齐（避免只写 remark/JSON 导致追溯困难）。
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- 注意：PostgreSQL 的可空列在本项目的 gen model 中可能会生成非指针类型（例如 `string/int64`），这会导致“未赋值”落库为 `''/0`：
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- 若你要为 `(biz_ref_type,biz_ref_id,...)` 建唯一索引，**不要**只写 `IS NOT NULL` 条件；
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- 应额外排除空/0（例如 `biz_ref_type <> '' AND biz_ref_id <> 0`），否则会因默认值冲突导致大量写入失败。
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- Array: `types.Array[T]`
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- UUID: `types.UUID`, `types.BinUUID`
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- Date/Time: `types.Date`, `types.Time`
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- Money/XML/URL/Binary: `types.Money`, `types.XML`, `types.URL`, `types.HexBytes`
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- Bit string: `types.BitString`
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- Network: `types.Inet`, `types.CIDR`, `types.MACAddr`
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- Ranges: `types.Int4Range`, `types.Int8Range`, `types.NumRange`, `types.TsRange`, `types.TstzRange`, `types.DateRange`
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- Geometry: `types.Point`, `types.Polygon`, `types.Box`, `types.Circle`, `types.Path`
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- Fulltext: `types.TSQuery`, `types.TSVector`
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- Nullable: `types.Null[T]` and aliases (requires DB NULL)
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Reference:
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- Detailed examples: `gen/types/README.md`
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### 2.4 Relationships (GORM-aligned) via `.transform.yaml`
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Define in `field_relate.<table>.<FieldName>`:
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- `relation`: `belongs_to` | `has_one` | `has_many` | `many_to_many`
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- `table`: target table
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- `pivot`: join table (many_to_many only)
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- `foreign_key`, `references`
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- `join_foreign_key`, `join_references` (many_to_many only)
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- `json`: JSON field name in API outputs
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Generator will convert snake_case columns to Go struct field names (e.g. `class_id` → `ClassID`).
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### 2.5 Extending generated models
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- Add manual methods/hooks by creating `backend/database/models/<table>.go`.
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- Keep generated files untouched ; put custom logic only in your own file(s).
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---
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## 3) Service layer injection (when adding services)
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- Services are in `backend/app/services`.
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- Data access boundary:
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- MUST: only the `services` layer may query the database via `models.*Query`, `models.Q.*`, `gorm.DB`, or raw SQL.
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- DO NOT: perform any direct database query from HTTP modules (`backend/app/http/**`) including controllers, DTO binders, or middlewares.
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- HTTP modules must call `services.*` for all read/write operations.
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- After creating/updating a service provider, regenerate wiring:
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- `atomctl gen service`
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- `atomctl gen provider`
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- Injection rule: provider injected dependencies MUST be `success`. do not add business-level fallbacks for injection objects nil check.
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- Service call conventions:
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- **Service-to-service (inside `services` package)**: call directly as `CamelCaseServiceStructName.Method()` (no `services.` prefix).
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- **From outside (controllers/handlers/etc.)**: call via the package entrypoint `services.CamelCaseServiceStructName.Method()`.
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---
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## 4) Quick command summary (run in `backend/`)
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- `make run` / `make build` / `make test`
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- `atomctl gen route` / `atomctl gen provider` / `atomctl swag init`
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- `atomctl migrate create ...` / `atomctl migrate up`
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- `atomctl gen model` / `atomctl gen enum` / `atomctl gen service`
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- `make init` (full refresh)
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---
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## 5) Service Layer Unit Testing Guidelines (Generic)
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This section is framework-agnostic and applies to any Go service layer (regardless of DI container, ORM, or web framework).
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### 5.1 Decide what you are testing
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- **Pure unit tests**: no DB/network/filesystem; dependencies are mocked/faked; tests are fast and deterministic.
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- **DB-backed tests (recommended whenever the feature touches the database)**: exercise a real database to validate SQL, constraints, transactions, and ORM behavior.
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- Always state which tier the test belongs to and keep the scope consistent.
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### 5.2 Design the service for testability
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- Inject dependencies via constructor or fields; depend on **interfaces**, not concrete DB clients.
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- Keep domain logic **pure** where possible: parse/validate/compute should be testable without IO.
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- Make time/UUID/randomness deterministic by injecting `Clock`/`IDGenerator` when needed.
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- If the feature requires database access, **do not mock the database**; test with an **actual database** (ideally same engine/version as production) to ensure data accuracy. Use mocks/fakes only for non-DB external dependencies when appropriate (e.g., HTTP, SMS, third-party APIs).
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### 5.3 Test structure and conventions
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- Prefer `*_test.go` with table-driven tests and subtests: `t.Run("case", func(t *testing.T) { ... })`.
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- Prefer testing the public API from an external package (`package xxx_test`) unless you must access unexported helpers.
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- Avoid “focused” tests in committed code (e.g. `FocusConvey`, `FIt`, `fit`, `it.only`, or equivalent), because they silently skip other tests.
|
||
- MUST: in service layer tests, **one test method should focus on one service method** only (e.g. `Test_Freeze` covers `Ledger.Freeze`, `Test_Unfreeze` covers `Ledger.Unfreeze`); do not bundle multiple service methods into a single `Test_*` method.
|
||
- MUST: within that single `Test_<Method>` function, cover the method’s key behavior contracts and boundary conditions via subcases (`Convey` blocks or `t.Run`) so the method’s behavior can be reviewed in one place (do NOT claim to cover “all edge cases”, but cover the important ones).
|
||
- MUST (minimum set): for each service method test, cover at least: happy path; invalid params / precondition failures; insufficient resources / permission denied (if applicable); idempotency/duplicate call behavior (if applicable); and at least one typical persistence/transaction failure branch (if it is hard to simulate reliably, move that branch coverage to a DB-backed integration/e2e test).
|
||
|
||
### 5.4 Isolation rules
|
||
|
||
- Each test must be independent and order-agnostic.
|
||
- For integration tests:
|
||
- Use transaction rollback per test when possible; otherwise use truncate + deterministic fixtures.
|
||
- Never depend on developer-local state; prefer ephemeral DB (container) or a dedicated test database/schema.
|
||
|
||
### 5.5 Assertions and error checks
|
||
|
||
- Always assert both **result** and **error** (and error types via `errors.Is` / `errors.As` when wrapping is used).
|
||
- Keep assertions minimal but complete: verify behavior, not implementation details.
|
||
- Use the standard library (`testing`) or a single assertion library consistently across the repo.
|
||
|
||
### 5.6 Minimal test file template (DI-bootstrapped, DB-backed)
|
||
|
||
This template matches a common pattern where tests boot a DI container and run against a real database. Replace the bootstrap (`testx.Default/Serve`, `Provide`) and cleanup (`database.Truncate`) with your project's equivalents.
|
||
|
||
```go
|
||
package services
|
||
|
||
import (
|
||
"database/sql"
|
||
"testing"
|
||
|
||
"quyun/v2/app/commands/testx"
|
||
"quyun/v2/database"
|
||
"quyun/v2/database/models"
|
||
|
||
. "github.com/smartystreets/goconvey/convey"
|
||
"github.com/stretchr/testify/suite"
|
||
|
||
"go.ipao.vip/atom/contracts"
|
||
"go.uber.org/dig"
|
||
)
|
||
|
||
type XxxTestSuiteInjectParams struct {
|
||
dig.In
|
||
|
||
DB *sql.DB
|
||
Initials []contracts.Initial `group:"initials"`
|
||
}
|
||
|
||
type XxxTestSuite struct {
|
||
suite.Suite
|
||
XxxTestSuiteInjectParams
|
||
}
|
||
|
||
func Test_Xxx(t *testing.T) {
|
||
providers := testx.Default().With(Provide)
|
||
|
||
testx.Serve(providers, t, func(p XxxTestSuiteInjectParams) {
|
||
suite.Run(t, &XxxTestSuite{XxxTestSuiteInjectParams: p})
|
||
})
|
||
}
|
||
|
||
func (s *XxxTestSuite) Test_Method() {
|
||
Convey("describe behavior here", s.T(), func() {
|
||
ctx := s.T().Context()
|
||
|
||
database.Truncate(ctx, s.DB, models.TableNameUser)
|
||
|
||
got, err := User.FindByUsername(ctx, "alice")
|
||
So(err, ShouldNotBeNil)
|
||
So(got, ShouldBeNil)
|
||
})
|
||
}
|
||
```
|