---
name: crud-transport-grpc
description: PowerX gRPC 传输层规则（全局 server、拦截器链、DI）。
---

# PowerX CRUD Transport gRPC

## 步骤

1) 打开 `本文件内嵌规则`。
2) 按规则执行实现/校对。
3) 完成后按核对清单验收。

## 核对点

- 与 PowerX 当前代码结构、路径与命名一致。
- 仅在传输层/契约层做职责内改动，不跨层越界。

## 规则（内嵌）

### transport_grpc.yaml

````yaml
kind: ruleset
name: transport_grpc
version: 1.0.0
owner: powerx
status: stable

meta:
  intent: >
    规范 gRPC 服务器层的实现：单实例 Server、模块级 Handler；统一拦截器（鉴权/租户/日志/恢复/限流/校验）；
    错误映射到 gRPC status；尊重 deadline；透传/回写 metadata；按需支持流式事件与健康检查/反射。
  references:
    - crud_grpc.yaml
    - crud_service.yaml
    - crud_di.yaml
    - proto_gen.yaml

scope:
  applies_to:
    - "internal/transport/grpc/**/**.go"
    - "internal/server/grpc/**/**.go"

principles:
  - 传输解耦：gRPC 层仅依赖 *shared.Deps 和 Service，不直连 Repo/DB/外部客户端。
  - 可观测：记录 request_id/trace_id/tenant/actor 与方法名、耗时、错误码等关键指标。
  - 一致性：错误语义与 REST/Service 对齐；分页与 DTO 吻合。
  - 健壮性：统一恢复拦截；尊重客户端 deadline；合理默认超时；支持优雅停机。
  - 扩展性：拦截器链条可插拔；流式事件名与 REST SSE 保持一致。
  - 单实例：仅允许一个全局 gRPC Server（internal/server/grpc/server.go）。

checks:

  # ===== 全局 Server（唯一）：负责 New + 拦截器 + 集中注册 =====
  - id: grpc.global.server.shape
    level: error
    when: { file: "internal/server/grpc/server.go" }
    assert:
      - must_contain_regex: "grpc\\.NewServer\\("
      - must_contain_regex: "Register[A-Za-z0-9]+ServiceServer\\(.*\\)"
      - must_not_import: ["gorm.io/gorm","database/sql","github.com/gin-gonic/gin"]

  # ===== 模块实现文件：允许 *_handler.go 或 service.go，禁止 new/register =====
  - id: grpc.module.impl.shape
    level: error
    when: { glob: "internal/transport/grpc/**/{*_handler.go,service.go}" }
    assert:
      - must_contain_regex: "type\\s+Server\\s+struct\\s*{\\s*\\*shared\\.Deps\\s*}"
      - must_contain_regex: "func\\s+New\\(deps\\s*\\*shared\\.Deps\\)\\s*\\*Server"
      - must_not_contain_regex: "grpc\\.NewServer\\("
      - must_not_contain_regex: "Register[A-Za-z0-9]+ServiceServer\\("
      - must_not_import: ["database/sql","github.com/gin-gonic/gin"]

  # ===== 代码生成产物位置校验 =====
  - id: grpc.codegen.layout
    level: error
    when: { file: "api/grpc/contract/buf.gen.yaml" }
    assert:
      - contains: "api/grpc/gen"

  # ========= 依赖注入：必须通过 Deps 注入 Service =========
  di_usage:
    - id: grpc.depends_on_service_only
      level: error
      when: { glob: "internal/transport/grpc/**/**.go" }
      assert:
        - should_contain: "deps"
        - must_not_import: ["gorm.io/gorm","database/sql"]
        - must_not_call: ["redis.NewClient(","kafka.NewReader(","sql.Open("]

  # ========= 拦截器：Unary & Stream 必配链（检查全局 server）=========
  interceptors:
    - id: grpc.chain.interceptors
      level: error
      when: { file: "internal/server/grpc/server.go" }
      assert:
        - must_contain_any:
            - "grpc.ChainUnaryInterceptor("
            - "grpc_middleware.ChainUnaryServer("
        - must_contain_any:
            - "grpc.ChainStreamInterceptor("
            - "grpc_middleware.ChainStreamServer("
    - id: grpc.interceptors.kinds
      level: warn
      when: { file: "internal/server/grpc/server.go" }
      assert:
        - should_contain_any:
            - "AuthUnaryInterceptor"
            - "TenantUnaryInterceptor"
            - "LoggingUnaryInterceptor"
            - "RecoveryUnaryInterceptor"
            - "RateLimitUnaryInterceptor"
            - "ValidateUnaryInterceptor"

  # ========= Metadata 与 Deadline =========
  metadata_deadline:
    - id: grpc.metadata.read
      level: error
      when: { glob: "internal/transport/grpc/**/**.go" }
      assert:
        - must_contain_any: ["metadata.FromIncomingContext","grpc.SetHeader","grpc.SetTrailer"]
    - id: grpc.deadline.respect
      level: warn
      when: { glob: "internal/transport/grpc/**/**.go" }
      assert:
        - should_contain_any:
            - "ctx, cancel := context.WithTimeout("
            - "if _, ok := ctx.Deadline(); ok {"
            - "deadline, ok := ctx.Deadline()"

  # ========= 鉴权与多租户（通常由拦截器注入）=========
  auth_tenant:
    - id: grpc.auth.from_metadata
      level: warn
      when: { glob: "internal/transport/grpc/**/interceptors*.go" }
      assert:
        - should_contain_any: ["authorization","bearer","jwt","tenant","actor"]
    - id: grpc.tenant.required_in_ctx
      level: warn
      when: { glob: "internal/transport/grpc/**/**.go" }
      assert:
        - should_contain: "TenantIDFromCtx("

  # ========= 错误映射 =========
  error_mapping:
    - id: grpc.error.to_status
      level: error
      when: { glob: "internal/transport/grpc/**/**.go" }
      assert:
        - must_contain_any: ["status.Error(","status.Errorf("]
        - must_import: ["google.golang.org/grpc/status","google.golang.org/grpc/codes"]

  # ========= 服务实现仅调用 Service =========
  handler_calls_service:
    - id: grpc.handler.calls.service
      level: error
      when: { glob: "internal/transport/grpc/**/**.go" }
      assert:
        - should_contain_regex: "s\\.Deps\\.[A-Za-z0-9]+Service\\."
        - must_not_import: ["internal/repository"]

  # ========= 流式（存在时）事件与取消 =========
  streaming:
    - id: grpc.streaming.events
      level: warn
      when: { contains: "stream " }
      assert:
        - should_contain_any: ["start","token","data","final","end","error","heartbeat"]
        - should_contain_any: ["ctx.Err()","stream.Context()"]

  # ========= 可选：健康检查与反射（检查全局 server）=========
  health_reflection:
    - id: grpc.health.reflection
      level: info
      when: { file: "internal/server/grpc/server.go" }
      assert:
        - should_contain_any:
            - "health.NewServer("
            - "reflection.Register("

acceptance:
  checklist:
    - "[ ] 仅存在一个全局 gRPC Server：internal/server/grpc/server.go"
    - "[ ] 模块实现通过 New(*shared.Deps) 构造，禁止 new/register server"
    - "[ ] 已配置 Unary/Stream 拦截器链（鉴权/租户/日志/恢复/限流/校验 可按需）"
    - "[ ] 通过 metadata 读写 request_id/trace_id，尊重 client deadline"
    - "[ ] 错误映射使用 status/codes，语义与 REST/Service 对齐"
    - "[ ] 如有流式：事件名与 REST SSE 对齐、处理取消与心跳"
    - "[ ] （可选）健康检查与反射启用"

templates:

  server_go: |
    // internal/transport/grpc/server.go
    package grpcserver

    import (
      "context"
      "net"
      "time"

      "google.golang.org/grpc"
      "google.golang.org/grpc/metadata"
      "google.golang.org/grpc/status"
      "google.golang.org/grpc/codes"

      "github.com/ArtisanCloud/PowerX/internal/app/shared"
      gen "{{module_path}}/api/grpc/gen/media"
    )

    type Server struct {
      deps *shared.Deps
      gs   *grpc.Server
    }

    func New(deps *shared.Deps) *Server {
      unary := grpc.ChainUnaryInterceptor(
        AuthUnaryInterceptor(deps),
        TenantUnaryInterceptor(deps),
        LoggingUnaryInterceptor(deps),
        RecoveryUnaryInterceptor(),
        // RateLimitUnaryInterceptor(...),
        // ValidateUnaryInterceptor(...),
      )
      stream := grpc.ChainStreamInterceptor(
        AuthStreamInterceptor(deps),
        TenantStreamInterceptor(deps),
        LoggingStreamInterceptor(deps),
        RecoveryStreamInterceptor(),
      )
      gs := grpc.NewServer(unary, stream)
      s := &Server{deps: deps, gs: gs}

      gen.RegisterMediaAssetServiceServer(gs, s) // 示例注册
      return s
    }

    func (s *Server) Serve(l net.Listener) error { return s.gs.Serve(l) }
    func (s *Server) Stop() { s.gs.GracefulStop() }

    // ---- 示例：实现方法仅调用 Service，并处理 metadata / deadline ----
    func (s *Server) GetMediaAsset(ctx context.Context, in *gen.GetMediaAssetRequest) (*gen.MediaAssetResponse, error) {
      // deadline：若上游未设置，则给一个合理默认
      if _, ok := ctx.Deadline(); !ok {
        var cancel context.CancelFunc
        ctx, cancel = context.WithTimeout(ctx, 10*time.Second)
        defer cancel()
      }
      // 读取 request metadata（如 request-id）
      if md, ok := metadata.FromIncomingContext(ctx); ok {
        _ = md.Get("x-request-id")
      }
      tenantID := TenantIDFromCtx(ctx) // 由拦截器注入
      out, err := s.deps.MediaAssetService.Get(ctx, tenantID, in.GetId())
      if err != nil { return nil, toStatus(err) }
      return &gen.MediaAssetResponse{Data: MapToProto(out)}, nil
    }

  interceptors_go: |
    // internal/transport/grpc/interceptors.go
    package grpcserver

    import (
      "context"
      "strings"
      "time"

      "google.golang.org/grpc"
      "google.golang.org/grpc/metadata"
      "google.golang.org/grpc/status"
      "google.golang.org/grpc/codes"

      "github.com/ArtisanCloud/PowerX/internal/app/shared"
    )

    type ctxKey string
    const (
      tenantKey ctxKey = "tenant_id"
      actorKey  ctxKey = "actor_id"
    )

    func TenantIDFromCtx(ctx context.Context) uint64 {
      v := ctx.Value(tenantKey)
      if v == nil { return 0 }
      if n, ok := v.(uint64); ok { return n }
      return 0
    }

    func AuthUnaryInterceptor(deps *shared.Deps) grpc.UnaryServerInterceptor {
      return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
        md, _ := metadata.FromIncomingContext(ctx)
        tok := getBearer(md.Get("authorization"))
        if tok == "" {
          return nil, status.Error(codes.Unauthenticated, "missing token")
        }
        // TODO: 验证 JWT/STS → 解析 tenant/actor
        ctx = context.WithValue(ctx, tenantKey, /* tenantID */ uint64(1))
        ctx = context.WithValue(ctx, actorKey, /* actorID */ uint64(1))
        return handler(ctx, req)
      }
    }

    func TenantUnaryInterceptor(deps *shared.Deps) grpc.UnaryServerInterceptor {
      return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
        if TenantIDFromCtx(ctx) == 0 {
          return nil, status.Error(codes.InvalidArgument, "tenant missing")
        }
        return handler(ctx, req)
      }
    }

    func LoggingUnaryInterceptor(deps *shared.Deps) grpc.UnaryServerInterceptor {
      return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
        start := time.Now()
        resp, err := handler(ctx, req)
        // TODO: 记录 method、耗时、tenant、actor、status 等
        _ = start
        return resp, err
      }
    }

    func RecoveryUnaryInterceptor() grpc.UnaryServerInterceptor {
      return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
        defer func() { if r := recover(); r != nil { err = status.Error(codes.Internal, "panic recovered") } }()
        return handler(ctx, req)
      }
    }

    func getBearer(vals []string) string {
      for _, v := range vals {
        v = strings.TrimSpace(v)
        if strings.HasPrefix(strings.ToLower(v), "bearer ") {
          return strings.TrimSpace(v[7:])
        }
      }
      return ""
    }

  errors_map_go: |
    // internal/transport/grpc/errors_map.go
    package grpcserver

    import (
      "errors"

      "google.golang.org/grpc/codes"
      "google.golang.org/grpc/status"
    )

    func toStatus(err error) error {
      switch {
      case IsNotFound(err):
        return status.Error(codes.NotFound, "not found")
      case IsConflict(err):
        return status.Error(codes.AlreadyExists, "conflict")
      case IsUnauthorized(err):
        return status.Error(codes.Unauthenticated, "unauthenticated")
      case IsForbidden(err):
        return status.Error(codes.PermissionDenied, "forbidden")
      case IsRateLimited(err):
        return status.Error(codes.ResourceExhausted, "rate limited")
      case IsPrecondition(err):
        return status.Error(codes.FailedPrecondition, "precondition failed")
      default:
        return status.Error(codes.Internal, err.Error())
      }
    }

  mapping_helper_go: |
    // internal/transport/grpc/mapping_helper.go
    package grpcserver

    import (
      gen "{{module_path}}/api/grpc/gen/media"
      m "{{module_path}}/pkg/corex/db/persistence/model/media"
    )

    func MapToProto(in *m.MediaAsset) *gen.MediaAsset {
      if in == nil { return nil }
      return &gen.MediaAsset{
        Id: in.ID,
        TenantId: in.TenantID,
        Name: in.Name,
        Code: in.Code,
        MetaJson: string(in.Meta),
        Status: int32(in.Status),
        // TODO: 时间字段转换
      }
    }

    func MapListToProto(items []*m.MediaAsset) []*gen.MediaAsset {
      out := make([]*gen.MediaAsset, 0, len(items))
      for _, it := range items { out = append(out, MapToProto(it)) }
      return out
    }
````