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go-grpc

Precio sin confirmar★ 71 Estrellas de GitHubRegistro actualizado · 8 sept 2026agent-skill

Resumen

gRPC services in Go beyond the basics: proto design, status codes and error details, interceptors, deadlines, streaming, health checks, and graceful shutdown. Use when: "gRPC service", "proto design", "gRPC error handling", "interceptor", "gRPC streaming", "gRPC deadline", "grpc health check", "gRPC status codes". Not for: REST handlers (go-api-design), protobuf-agnostic layering (go-architecture-review), TLS hardening (go-security-audit).

Leer documentación completa

Documentación de origen, no instrucciones para este sitio. Revisa los permisos antes de ejecutar comandos.

Go gRPC Services

gRPC's contract-first model only pays off if the contract is treated as an API: versioned packages, deliberate error codes, deadlines everywhere, and interceptors for everything cross-cutting.

1. Proto Design Rules

syntax = "proto3";

package payment.v1;                            // version IN the package
option go_package = "github.com/acme/payment-service/gen/payment/v1;paymentv1";

service PaymentService {
  rpc CreatePayment(CreatePaymentRequest) returns (CreatePaymentResponse);
}

message CreatePaymentRequest {                 // one request/response pair
  string order_id = 1;                         // per RPC, always — even if
  int64 amount_cents = 2;                      // empty today
}

message CreatePaymentResponse {
  Payment payment = 1;
}

Version in the package (payment.v1); breaking change = payment.v2.
Never reuse or renumber field tags; reserved 3, 7; deleted ones.
Dedicated Request/Response messages per RPC — adding a field later is free; changing a shared message breaks every RPC using it.
Generate with buf or a pinned protoc in make generate; commit generated code so builds don't depend on toolchain drift.

2. Errors: Status Codes, Not Strings

Return status.Error, mapping domain errors in ONE place:

func (s *Server) CreatePayment(ctx context.Context, req *pb.CreatePaymentRequest) (*pb.CreatePaymentResponse, error) {
    p, err := s.svc.Create(ctx, toDomain(req))
    if err != nil {
        return nil, toStatus(err)
    }
    return &pb.CreatePaymentResponse{Payment: fromDomain(p)}, nil
}

func toStatus(err error) error {
    switch {
    case errors.Is(err, domain.ErrNotFound):
        return status.Error(codes.NotFound, "payment not found")
    case errors.Is(err, domain.ErrDuplicate):
        return status.Error(codes.AlreadyExists, "payment already exists")
    case errors.Is(err, context.DeadlineExceeded):
        return status.Error(codes.DeadlineExceeded, "timed out")
    default:
        return status.Error(codes.Internal, "internal error") // no details leak
    }
}

Code semantics that matter: InvalidArgument (bad request regardless of state), FailedPrecondition (bad state), NotFound, AlreadyExists, Unauthenticated vs PermissionDenied, Unavailable (retryable), Internal (bug). Clients read codes with status.FromError(err) — never parse messages.

3. Deadlines Are Mandatory

// Client — every call gets a deadline
ctx, cancel := context.WithTimeout(ctx, 2*time.Second)
defer cancel()
resp, err := client.CreatePayment(ctx, req)

// Server — check before expensive work
if err := ctx.Err(); err != nil {
    return nil, status.FromContextError(err).Err()
}

The server inherits the client's deadline through the context. Pass ctx into every downstream call (DB, other RPCs) so cancellation propagates end to end.

4. Interceptors for Cross-Cutting Concerns

Handlers stay business-only; recovery, auth, logging, metrics live in interceptors:

srv := grpc.NewServer(
    grpc.ChainUnaryInterceptor(
        recoveryInterceptor,   // outermost: panic → codes.Internal
        loggingInterceptor,
        authInterceptor,
    ),
)

func loggingInterceptor(ctx context.Context, req any,
    info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (any, error) {
    start := time.Now()
    resp, err := handler(ctx, req)
    slog.InfoContext(ctx, "rpc",
        slog.String("method", info.FullMethod),
        slog.Duration("duration", time.Since(start)),
        slog.String("code", status.Code(err).String()),
    )
    return resp, err
}

Order matters: recovery first (outermost), then observability, then auth. Streaming RPCs need the parallel StreamInterceptor versions.

5. Streaming

Server streaming for large result sets: stream.Send in a loop, return non-nil error to abort with a status.
Client/bidi streaming only when the protocol truly needs it — each open stream holds a goroutine and flow-control state.
Always terminate on ctx.Done():

func (s *Server) WatchPayments(req *pb.WatchRequest, stream pb.PaymentService_WatchPaymentsServer) error {
    for {
        select {
        case <-stream.Context().Done():
            return status.FromContextError(stream.Context().Err()).Err()
        case ev := <-s.events:
            if err := stream.Send(toProto(ev)); err != nil {
                return err
            }
        }
    }
}

6. Production Server Setup

lis, err := net.Listen("tcp", cfg.Addr)
if err != nil {
    return fmt.Errorf("listen: %w", err)
}

srv := grpc.NewServer(grpc.ChainUnaryInterceptor(...))
pb.RegisterPaymentServiceServer(srv, server)

healthSrv := health.NewServer() // grpc.health.v1 — load balancers need it
healthpb.RegisterHealthServer(srv, healthSrv)
reflection.Register(srv)        // grpcurl/debugging; gate on non-prod if policy requires

go func() {
    <-ctx.Done()
    stopped := make(chan struct{})
    go func() { srv.GracefulStop(); close(stopped) }()
    select {
    case <-stopped:                 // in-flight RPCs finished
    case <-time.After(10 * time.Second):
        srv.Stop()                  // force after grace period
    }
}()

return srv.Serve(lis)

Verification Checklist

Proto packages versioned (*.v1); no tag reuse; reserved for removals
Dedicated Request/Response message per RPC
Generated code produced by a pinned tool (buf/protoc) and committed
All handler errors are status.Error with semantically correct codes
codes.Internal responses never leak internal error text
Every client call has a deadline; ctx propagated through all layers
Recovery, logging, auth implemented as chained interceptors (unary + stream)
Streams select on stream.Context().Done()
Health service registered; graceful stop with forced fallback
grpcurl smoke test (or generated client test) passes against the running server

Ver fuente ↗

Metadatos del archivo

name: go-grpc
description: >
  gRPC services in Go beyond the basics: proto design, status codes and
  error details, interceptors, deadlines, streaming, health checks, and
  graceful shutdown. Use when: "gRPC service", "proto design", "gRPC error
  handling", "interceptor", "gRPC streaming", "gRPC deadline", "grpc health
  check", "gRPC status codes".
  Not for: REST handlers (go-api-design), protobuf-agnostic layering
  (go-architecture-review), TLS hardening (go-security-audit).
user-invocable: true
license: MIT
compatibility: Designed for Claude Code or similar AI coding agents working on Go projects. Requires the Go toolchain. Requires protoc or buf for code generation.
allowed-tools: Read Edit Write Glob Grep Bash(go:*) Bash(gofmt:*) Bash(protoc:*) Bash(buf:*)
metadata:
  author: eduardo-sl
  version: "1.1.1"

Ver texto original

---
name: go-grpc
description: >
  gRPC services in Go beyond the basics: proto design, status codes and
  error details, interceptors, deadlines, streaming, health checks, and
  graceful shutdown. Use when: "gRPC service", "proto design", "gRPC error
  handling", "interceptor", "gRPC streaming", "gRPC deadline", "grpc health
  check", "gRPC status codes".
  Not for: REST handlers (go-api-design), protobuf-agnostic layering
  (go-architecture-review), TLS hardening (go-security-audit).
user-invocable: true
license: MIT
compatibility: Designed for Claude Code or similar AI coding agents working on Go projects. Requires the Go toolchain. Requires protoc or buf for code generation.
allowed-tools: Read Edit Write Glob Grep Bash(go:*) Bash(gofmt:*) Bash(protoc:*) Bash(buf:*)
metadata:
  author: eduardo-sl
  version: "1.1.1"
---

# Go gRPC Services

gRPC's contract-first model only pays off if the contract is treated as
an API: versioned packages, deliberate error codes, deadlines
everywhere, and interceptors for everything cross-cutting.

## 1. Proto Design Rules

```protobuf
syntax = "proto3";

package payment.v1;                            // version IN the package
option go_package = "github.com/acme/payment-service/gen/payment/v1;paymentv1";

service PaymentService {
  rpc CreatePayment(CreatePaymentRequest) returns (CreatePaymentResponse);
}

message CreatePaymentRequest {                 // one request/response pair
  string order_id = 1;                         // per RPC, always — even if
  int64 amount_cents = 2;                      // empty today
}

message CreatePaymentResponse {
  Payment payment = 1;
}
```

- Version in the package (`payment.v1`); breaking change = `payment.v2`.
- Never reuse or renumber field tags; `reserved 3, 7;` deleted ones.
- Dedicated Request/Response messages per RPC — adding a field later is
  free; changing a shared message breaks every RPC using it.
- Generate with buf or a pinned protoc in `make generate`; commit
  generated code so builds don't depend on toolchain drift.

## 2. Errors: Status Codes, Not Strings

Return `status.Error`, mapping domain errors in ONE place:

```go
func (s *Server) CreatePayment(ctx context.Context, req *pb.CreatePaymentRequest) (*pb.CreatePaymentResponse, error) {
    p, err := s.svc.Create(ctx, toDomain(req))
    if err != nil {
        return nil, toStatus(err)
    }
    return &pb.CreatePaymentResponse{Payment: fromDomain(p)}, nil
}

func toStatus(err error) error {
    switch {
    case errors.Is(err, domain.ErrNotFound):
        return status.Error(codes.NotFound, "payment not found")
    case errors.Is(err, domain.ErrDuplicate):
        return status.Error(codes.AlreadyExists, "payment already exists")
    case errors.Is(err, context.DeadlineExceeded):
        return status.Error(codes.DeadlineExceeded, "timed out")
    default:
        return status.Error(codes.Internal, "internal error") // no details leak
    }
}
```

Code semantics that matter: `InvalidArgument` (bad request regardless
of state), `FailedPrecondition` (bad state), `NotFound`, `AlreadyExists`,
`Unauthenticated` vs `PermissionDenied`, `Unavailable` (retryable),
`Internal` (bug). Clients read codes with `status.FromError(err)` —
never parse messages.

## 3. Deadlines Are Mandatory

```go
// Client — every call gets a deadline
ctx, cancel := context.WithTimeout(ctx, 2*time.Second)
defer cancel()
resp, err := client.CreatePayment(ctx, req)

// Server — check before expensive work
if err := ctx.Err(); err != nil {
    return nil, status.FromContextError(err).Err()
}
```

The server inherits the client's deadline through the context. Pass
`ctx` into every downstream call (DB, other RPCs) so cancellation
propagates end to end.

## 4. Interceptors for Cross-Cutting Concerns

Handlers stay business-only; recovery, auth, logging, metrics live in
interceptors:

```go
srv := grpc.NewServer(
    grpc.ChainUnaryInterceptor(
        recoveryInterceptor,   // outermost: panic → codes.Internal
        loggingInterceptor,
        authInterceptor,
    ),
)

func loggingInterceptor(ctx context.Context, req any,
    info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (any, error) {
    start := time.Now()
    resp, err := handler(ctx, req)
    slog.InfoContext(ctx, "rpc",
        slog.String("method", info.FullMethod),
        slog.Duration("duration", time.Since(start)),
        slog.String("code", status.Code(err).String()),
    )
    return resp, err
}
```

Order matters: recovery first (outermost), then observability, then
auth. Streaming RPCs need the parallel `StreamInterceptor` versions.

## 5. Streaming

- **Server streaming** for large result sets: `stream.Send` in a loop,
  return non-nil error to abort with a status.
- **Client/bidi streaming** only when the protocol truly needs it —
  each open stream holds a goroutine and flow-control state.
- Always terminate on `ctx.Done()`:

```go
func (s *Server) WatchPayments(req *pb.WatchRequest, stream pb.PaymentService_WatchPaymentsServer) error {
    for {
        select {
        case <-stream.Context().Done():
            return status.FromContextError(stream.Context().Err()).Err()
        case ev := <-s.events:
            if err := stream.Send(toProto(ev)); err != nil {
                return err
            }
        }
    }
}
```

## 6. Production Server Setup

```go
lis, err := net.Listen("tcp", cfg.Addr)
if err != nil {
    return fmt.Errorf("listen: %w", err)
}

srv := grpc.NewServer(grpc.ChainUnaryInterceptor(...))
pb.RegisterPaymentServiceServer(srv, server)

healthSrv := health.NewServer() // grpc.health.v1 — load balancers need it
healthpb.RegisterHealthServer(srv, healthSrv)
reflection.Register(srv)        // grpcurl/debugging; gate on non-prod if policy requires

go func() {
    <-ctx.Done()
    stopped := make(chan struct{})
    go func() { srv.GracefulStop(); close(stopped) }()
    select {
    case <-stopped:                 // in-flight RPCs finished
    case <-time.After(10 * time.Second):
        srv.Stop()                  // force after grace period
    }
}()

return srv.Serve(lis)
```

## Verification Checklist

1. Proto packages versioned (`*.v1`); no tag reuse; `reserved` for removals
2. Dedicated Request/Response message per RPC
3. Generated code produced by a pinned tool (buf/protoc) and committed
4. All handler errors are `status.Error` with semantically correct codes
5. `codes.Internal` responses never leak internal error text
6. Every client call has a deadline; ctx propagated through all layers
7. Recovery, logging, auth implemented as chained interceptors (unary + stream)
8. Streams select on `stream.Context().Done()`
9. Health service registered; graceful stop with forced fallback
10. `grpcurl` smoke test (or generated client test) passes against the running server

Revisar el código fuente

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Licencia: MIT

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GitHub adoption: 71 GitHub stars
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Repositorio fuente: eduardo-sl/go-agent-skills
Licencia: MIT
Versión: 1.0.0
Último push de GitHub: 18 ago 2026
Registro actualizado: 8 sept 2026
Ruta de instrucciones: skills/(architecture)/go-grpc/SKILL.md @ 50133c33a386

Versión declarada en el registro; consulta las versiones de la fuente.

Calidad

57/100

Prometedor

Confianza

59/100

Do not auto-install

Auditoría

70/100

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Dependency or permission surface needs review
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Financial research output is not financial advice; require human review before any live investment decision
Falta aprobación de revisión por IA
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Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
GitHub adoption: 71 GitHub stars
Stars/forks activity: 71 stars, 9 forks; issue activity unavailable in current metadata
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      "total": 0,
      "successes": 0,
      "failures": 0,
      "not_relevant": 0,
      "success_rate": null,
      "recent_success_rate": null,
      "recent_failure_rate": null,
      "install_attempts": 0,
      "install_success_rate": null,
      "risk_blocked": 0,
      "setup_required": 0,
      "avg_output_quality": null,
      "production_outcomes": 0,
      "last_outcome_at": null,
      "label": "No agent outcome data yet"
    },
    "auto_install": {
      "allowed": false,
      "sandbox_required": true,
      "reason": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
    },
    "best_for": [
      "security",
      "agent-skill"
    ],
    "known_risks": [
      "AI review approval is missing",
      "Financial research output is not financial advice; require human review before any live investment decision.",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "GitHub adoption: 71 GitHub stars",
      "Stars/forks activity: 71 stars, 9 forks; issue activity unavailable in current metadata",
      "Dependency/runtime risk: command execution surface, credential or environment access",
      "Permission surface: secrets or environment access, shell or command execution"
    ]
  },
  "agent_proven": {
    "version": "agent-proven-v1",
    "score": 0,
    "tier": "unproven",
    "label": "Needs first agent run",
    "summary": "No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.",
    "metrics": {
      "totalOutcomes": 0,
      "successfulOutcomes": 0,
      "failedOutcomes": 0,
      "installAttempts": 0,
      "installSuccessRate": null,
      "successRate": null,
      "recentSuccessRate": null,
      "recentFailureRate": null,
      "riskBlocked": 0,
      "setupRequired": 0,
      "notRelevant": 0,
      "avgOutputQuality": null,
      "avgTimeToUsefulMs": null,
      "productionOutcomes": 0,
      "humanReviewRequired": 0,
      "uniqueAgents": 0,
      "lastOutcomeAt": null
    },
    "signals": [],
    "penalties": [
      "No real agent outcome evidence yet"
    ]
  },
  "audit": {
    "score": 70,
    "risk_level": "needs_review",
    "risk_label": "Needs review",
    "warnings": [
      "Dependency or permission surface needs review",
      "Permission surface may require sandboxing",
      "Financial research output is not financial advice; require human review before any live investment decision",
      "AI review approval is missing",
      "Financial research output is not financial advice; require human review before any live investment decision.",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "GitHub adoption: 71 GitHub stars"
    ]
  },
  "safety_gate": {
    "tier": "blocked",
    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 57,
    "label": "Promising"
  },
  "supply": {
    "track": "Coding and developer agents",
    "scenario": "Coding agents",
    "maintenance": "2mo since push",
    "risk": "Needs review"
  },
  "alternative_skills": [],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "high-compliance environments without internal security review",
    "No major risk signals from current metadata",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "Financial research output is not financial advice; require human review before any live investment decision",
    "AI review approval is missing"
  ],
  "agent_contract": {
    "task_input": "Use go-grpc in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 67/100 Manual review",
      "Audit: 70/100 Needs review",
      "Safety: 34/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "eduardo-sl-go-grpc (go-grpc)",
      "install_command": "npx skills add eduardo-sl/go-agent-skills --skill go-grpc",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "eduardo-sl-go-grpc",
      "task": "Use go-grpc in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/eduardo-sl-go-grpc",
    "api": "https://www.openagentskill.com/api/agent/skills/eduardo-sl-go-grpc",
    "audit": "https://www.openagentskill.com/skills/eduardo-sl-go-grpc/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=eduardo-sl-go-grpc&task=Use%20go-grpc%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20go-grpc%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20go-grpc%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/eduardo-sl-go-grpc/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/eduardo-sl-go-grpc"
  }
}

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Creador: eduardo-sl
Fuente: eduardo-sl/go-agent-skills
Indexado por: Índice comunitario de OpenAgentSkill

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