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go-grpc

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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).

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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

Voir la source ↗

Métadonnées du fichier

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"

Voir le texte 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

Examiner la source

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Licence: MIT
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Réviser avant installation: Éviter l’installation automatique

Licence: MIT

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
L’approbation de revue IA est absente
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
Review status: AI review approval is missing

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Commencer par une petite tâche

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3Vérifiez résultats et fichiers modifiés. Signalez uniquement ce qui a été exécuté et conservez la révision source.

Vérifiez les dépendances, clés API et frais externes dans la source. Un dépôt public ne rend pas tous les services gratuits.

Source et conseils d’utilisation

RépertoriéContrôle statique

Métadonnées et examens sont indicatifs. Popularité, découverte et exécution réussie sont des faits distincts.

Dépôt source: eduardo-sl/go-agent-skills
Licence: MIT
Version: 1.0.0
Dernier push GitHub: 18 août 2026
Registre mis à jour: 8 sept. 2026
Chemin des instructions: skills/(architecture)/go-grpc/SKILL.md @ 50133c33a386

Version déclarée dans le registre ; vérifiez les versions de la source.

Qualité

57/100

Prometteur

Confiance

59/100

Do not auto-install

Audit

70/100

Revue nécessaire

Ouvrir l’audit complet Voir le rapport d’évaluation

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
L’approbation de revue IA est absente
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
Review status: AI review approval is missing

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Résultats: —

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      "agentOutcomes": "No agent outcome data yet"
    },
    "outcome_evidence": {
      "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"
  }
}

Pour le créateur

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Cette fiche a été indexée à partir de sources publiques et n’est pas marquée officielle tant qu’une revendication de mainteneur n’est pas approuvée.

Créateur: eduardo-sl
Source: eduardo-sl/go-agent-skills
Indexé par: Index communautaire OpenAgentSkill

L’attribution renvoie au dépôt public ou au profil du créateur. Les créateurs peuvent revendiquer la fiche pour mettre à jour les signaux de propriété.

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