majiayu000/claude-arsenal
xiaohongshu
xiaohongshu
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Kratos Service Layer
kratos-service-layer
Generates gRPC/HTTP service handlers for go-kratos microservices. Creates service structs, handler methods, and integrates with protobuf definitions. Use when implementing RPC handlers, adding API endpoints, creating dual transport (HTTP/gRPC) handlers, or connecting transport layer to business l...
SKILL.md
Full skill instructions
<essential_principles>
How Kratos Service Layer Works
Service Layer Role
Connects transport (gRPC/HTTP) to business logic:
Responsibilities:
- Handle gRPC/HTTP requests
- Map proto DTOs to business models (via mapper)
- Call use case methods
- Map results back to proto responses
- Convert business errors to gRPC status codes
Service Struct Pattern
type {Entity}Service struct {
pb.Unimplemented{Entity}ServiceServer // Embed unimplemented server
uc domain.{Entity}UseCase // Use case dependency (from domain package)
}
Import: import "{service}/internal/biz/domain"
Handler Method Pattern
func (s *{Entity}Service) Create{Entity}(ctx context.Context, in *pb.Request) (*pb.Response, error) {
// 1. Map request to business model
entity := {Entity}FromRequest(in)
// 2. Call use case
result, err := s.uc.Create{Entity}(ctx, entity)
if err != nil {
return nil, toServiceError(err) // Map business error to gRPC error
}
// 3. Map result to response
return &pb.Response{Entity: toProto{Entity}(result)}, nil
}
</essential_principles>
<intake> What would you like to do?- Create service handlers for new entity
- Add handler methods to existing service
- View handler patterns and examples
Wait for response before proceeding. </intake>
<routing> | Response | Workflow | |----------|----------| | 1, "create", "new" | `workflows/create-service.md` | | 2, "add", "extend" | `workflows/add-handlers.md` | | 3, "examples", "patterns" | `workflows/view-examples.md` |After reading the workflow, follow it exactly. </routing>
<reference_index> Core: handler-pattern.md, service-structure.md, error-mapping.md Mappers: mapper-conventions.md </reference_index>
<workflows_index>
| Workflow | Purpose |
|---|---|
| create-service.md | Generate service handlers and mappers |
| add-handlers.md | Add methods to existing service |
| view-examples.md | Show patterns |
| </workflows_index> |
<success_criteria> Service layer code is correct when:
- Service struct embeds Unimplemented{Entity}ServiceServer
- Constructor added to service.ProviderSet
- Handlers map DTOs via mapper functions
- Errors converted to gRPC status codes
- All methods have godoc comments
- User reminded to run
make generate</success_criteria>
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