Crud Handler HTTP

kind: ruleset
name: crud_handler_http
version: 1.0.0
owner: powerx
status: stable

meta:
  intent: >
    规范 HTTP Handler 的目录、职责与调用形态：参数绑定/校验 → 调用 Service → 统一回包/错误桥接，
    禁止业务与 DB/外部 IO；分页、错误、SSE 事件与 REST 契约/DTO 对齐。
  references:
    - dev_crud_http_guides.md
    - constitution.md

scope:
  applies_to:
    - "internal/transport/http/**/**_handler.go"
    - "internal/transport/http/**/api.go"

principles:
  - Handler 只做 绑定/校验 → 调 Service → 回包；禁止写业务、DB 或外部 IO。   # 指南·Handler职责
  - DTO 独立于模型；参数绑定使用统一函数，错误使用 AppError 桥接返回。      # 指南·DTO/错误桥接
  - 路由注册独立在 api.go；前缀使用 /api/v1/{admin|open|web}。               # 指南·路由与版本
  - 多租户上下文来自中间件；缺失租户返回 400 语义，鉴权在 Service 落实。       # 宪章·多租户

checks:

  # 目录 & 入口
  - id: http.dir.shape
    level: error
    when:
      glob: "internal/transport/http/**/api.go"
    assert:
      - must_define: "func Register*Routes(*gin.RouterGroup, *shared.Deps)"
      - must_prefix_route_one_of: ["/api/v1/admin", "/api/v1/open", "/api/v1/web"]

  # Handler 职责边界
  - id: handler.no_db_or_io
    level: error
    when:
      glob: "internal/transport/http/**/**_handler.go"
    assert:
      - must_not_import: ["database/sql","gorm.io/gorm","net/http"] # 允许 gin 但禁止直接 http client
      - must_not_call: ["sql.DB","gorm.DB","http.DefaultClient.Do","os.Remove","ioutil.ReadAll"]
      - must_define_like: "type *Handler struct { svc *service.* }" # 依赖仅指向 Service

  - id: handler.ctor
    level: error
    when:
      glob: "internal/transport/http/**/**_handler.go"
    assert:
      - must_define_like: "func New*Handler(*service.*) *"
      - must_not_define: "func New*Handler(*gorm.DB)"               # 禁止直注 DB

  # 租户上下文与校验/绑定
  - id: handler.binding_and_tenant
    level: error
    when:
      glob: "internal/transport/http/**/**_handler.go"
    assert:
      - must_call_one_of: ["ValidateRequestWithContext(","ValidateAndBindWithContext("]
      - must_call: ["reqctx.From(c)"]       # 从中间件注入的上下文取 tenant/request_id
      - on_missing_tenant_http: 400

  # 统一回包与错误桥接
  - id: handler.response_envelope
    level: error
    when:
      glob: "internal/transport/http/**/**_handler.go"
    assert:
      - must_use_one_of: ["ResponseSuccess(","RespondOK(","RespondErrorFrom("]
      - http_status_in: [200,201,204,400,401,403,404,409,429,500]

  # 分页语义统一
  - id: handler.pagination_contract
    level: error
    when:
      glob: "internal/transport/http/**/**_handler.go"
    assert:
      - must_bind_dto: ["PaginationRequest"]
      - must_return: ["ResponseList","PaginationResponse"]

  # SSE/WS（若涉及）
  - id: handler.sse_events
    level: warn
    when:
      contains: "WriteToSSE("
    assert:
      - must_use_events:
          ["start","intent","plan","token","data","action","final","end","error","heartbeat"]

  # 契约一致性（与 REST 资源路由）
  - id: handler.crud_shape
    level: error
    when:
      glob: "internal/transport/http/**/api.go"
    assert:
      - must_register_methods:
          - 'POST ""'
          - 'GET ""'
          - 'GET "/:id"'
          - 'PATCH "/:id"'
          - 'DELETE "/:id"'

  # 依赖注入（Deps）
  - id: handler.deps_injection
    level: error
    when:
      glob: "internal/transport/http/**/**_handler.go"
    assert:
      - must_reference: "*shared.Deps"   # Handler 通过 Deps 链路拿到 svc（在 api.go 中）
      - must_not_new_external_clients: true

acceptance:
  checklist:
    - "[ ] api.go 只做路由注册，使用 /api/v1/{admin|open|web} 前缀"
    - "[ ] Handler 仅做绑定/校验/调用 Service/回包，不含 DB 与外部 IO"
    - "[ ] 使用 ValidateRequestWithContext/RespondErrorFrom/ResponseSuccess 等统一工具"
    - "[ ] 分页使用 PaginationRequest/PaginationResponse，列表用 ResponseList"
    - "[ ] SSE 事件（若有）使用统一事件名"
    - "[ ] 租户上下文来自中间件，缺失返回 400；鉴权/审计在 Service 层"
    - "[ ] Handler 构造函数存在，依赖通过 *shared.Deps 提供 svc"

templates:

  handler_go: |
    package {{domain}}

    import (
      "github.com/gin-gonic/gin"
      "github.com/ArtisanCloud/PowerX/internal/app/shared"
      "github.com/ArtisanCloud/PowerX/internal/service/{{domain}}"
      dto "{{module_path}}/internal/transport/http/{{layer}}/{{domain}}/dto"
      "github.com/ArtisanCloud/PowerX/pkg/corex/iam/reqctx"
    )

    type {{Entity}}Handler struct {
      svc *{{domain}}.{{Entity}}Service
    }

    func New{{Entity}}Handler(s *{{domain}}.{{Entity}}Service) *{{Entity}}Handler {
      return &{{Entity}}Handler{svc: s}
    }

    // POST /{{domain}}/{{resource}}
    func (h *{{Entity}}Handler) Create(c *gin.Context) {
      ctx, rc, err := ValidateRequestWithContext(c, &dto.{{Entity}}CreateReq{})
      if err != nil { RespondErrorFrom(c, err); return }
      out, err := h.svc.Create(ctx, rc.TenantID, rc.ActorID, rc.RequestID, rc.TraceID, rc.Payload)
      if err != nil { RespondErrorFrom(c, err); return }
      ResponseSuccess(c, out)
    }

    // GET /{{domain}}/{{resource}}
    func (h *{{Entity}}Handler) List(c *gin.Context) {
      ctx, rc, err := ValidateRequestWithContext(c, &dto.{{Entity}}ListReq{})
      if err != nil { RespondErrorFrom(c, err); return }
      items, pg, err := h.svc.List(ctx, rc.TenantID, rc.Pagination, rc.Filters)
      if err != nil { RespondErrorFrom(c, err); return }
      ResponseSuccess(c, ResponseList{Items: items, Pagination: pg})
    }

    // GET /{{domain}}/{{resource}}/:id
    func (h *{{Entity}}Handler) Get(c *gin.Context) {
      ctx, rc, err := ValidateRequestWithContext(c, &dto.{{Entity}}GetReq{})
      if err != nil { RespondErrorFrom(c, err); return }
      out, err := h.svc.Get(ctx, rc.TenantID, rc.ID)
      if err != nil { RespondErrorFrom(c, err); return }
      ResponseSuccess(c, out)
    }

    // PATCH /{{domain}}/{{resource}}/:id
    func (h *{{Entity}}Handler) Update(c *gin.Context) {
      ctx, rc, err := ValidateRequestWithContext(c, &dto.{{Entity}}UpdateReq{})
      if err != nil { RespondErrorFrom(c, err); return }
      out, err := h.svc.Update(ctx, rc.TenantID, rc.ID, rc.Payload, rc.IfMatch) // 支持 If-Match/ETag（可选）
      if err != nil { RespondErrorFrom(c, err); return }
      ResponseSuccess(c, out)
    }

    // DELETE /{{domain}}/{{resource}}/:id
    func (h *{{Entity}}Handler) Delete(c *gin.Context) {
      ctx, rc, err := ValidateRequestWithContext(c, &dto.{{Entity}}DeleteReq{})
      if err != nil { RespondErrorFrom(c, err); return }
      err = h.svc.Delete(ctx, rc.TenantID, rc.ID, rc.Force) // 默认为软删；Force 需权限
      if err != nil { RespondErrorFrom(c, err); return }
      ResponseSuccess(c, ResponseSuccess{OK: true})
    }

  api_go: |
    package {{domain}}

    import (
      "github.com/gin-gonic/gin"
      "github.com/ArtisanCloud/PowerX/internal/app/shared"
    )

    func Register{{Domain}}Routes(rg *gin.RouterGroup, deps *shared.Deps) {
      h := New{{Entity}}Handler(deps.{{Entity}}Service)
      g := rg.Group("/{{domain}}/{{resource}}")
      {
        g.POST("", h.Create)
        g.GET("", h.List)
        g.GET("/:id", h.Get)
        g.PATCH("/:id", h.Update)
        g.DELETE("/:id", h.Delete)
      }
    }