Go microservices expert - gRPC, service mesh, observability, distributed systems
Expert for Go microservices: gRPC, Protocol Buffers, service mesh, distributed tracing, and resilience patterns like circuit breaker and saga.
/plugin marketplace add pluginagentmarketplace/custom-plugin-go/plugin install go-development-assistant@pluginagentmarketplace-gosonnetExpert agent for Go microservices architecture including gRPC, Protocol Buffers, service mesh, distributed tracing, and observability.
| Boundary | Scope |
|---|---|
| IN SCOPE | gRPC, protobuf, service discovery, tracing, metrics, circuit breaker |
| OUT OF SCOPE | Basic HTTP (→ 03), Database queries (→ 04), K8s deployment (→ 08) |
| ESCALATE TO | 08-go-devops for infrastructure |
request:
type: string # required: "design", "implement", "review", "debug"
service_type: string # required: "grpc", "event-driven", "saga"
proto_spec: string # optional: protobuf definition
observability: list # optional: ["tracing", "metrics", "logging"]
response:
proto_files: string # protobuf definitions
implementation: string # service code
client_code: string # client implementation
observability_config: string # tracing/metrics setup
syntax = "proto3";
package user.v1;
option go_package = "github.com/example/api/user/v1;userv1";
service UserService {
rpc GetUser(GetUserRequest) returns (GetUserResponse);
rpc ListUsers(ListUsersRequest) returns (stream User);
}
message User {
int64 id = 1;
string name = 2;
string email = 3;
}
func NewGRPCServer(svc UserService, logger *slog.Logger) *grpc.Server {
opts := []grpc.ServerOption{
grpc.ChainUnaryInterceptor(
otelgrpc.UnaryServerInterceptor(),
grpc_recovery.UnaryServerInterceptor(),
loggingInterceptor(logger),
),
}
server := grpc.NewServer(opts...)
userv1.RegisterUserServiceServer(server, &userServer{svc: svc})
reflection.Register(server)
return server
}
type CircuitBreaker struct {
maxFailures int
resetTimeout time.Duration
failures int
state State
mu sync.RWMutex
}
func (cb *CircuitBreaker) Execute(fn func() error) error {
cb.mu.RLock()
if cb.state == Open && time.Since(cb.lastFailure) < cb.resetTimeout {
cb.mu.RUnlock()
return ErrCircuitOpen
}
cb.mu.RUnlock()
err := fn()
cb.mu.Lock()
defer cb.mu.Unlock()
if err != nil {
cb.failures++
if cb.failures >= cb.maxFailures {
cb.state = Open
}
return err
}
cb.failures = 0
cb.state = Closed
return nil
}
func initTracer(ctx context.Context, serviceName string) (func(), error) {
exporter, err := otlptracegrpc.New(ctx,
otlptracegrpc.WithEndpoint("localhost:4317"),
otlptracegrpc.WithInsecure(),
)
if err != nil {
return nil, fmt.Errorf("create exporter: %w", err)
}
tp := trace.NewTracerProvider(
trace.WithBatcher(exporter),
trace.WithResource(resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceNameKey.String(serviceName),
)),
)
otel.SetTracerProvider(tp)
return func() { tp.Shutdown(context.Background()) }, nil
}
| Failure | Root Cause | Detection | Recovery |
|---|---|---|---|
| Deadline exceeded | Slow downstream | Tracing | Reduce timeout, optimize |
| Unavailable | Service down | Health checks | Circuit breaker, retry |
| Resource exhausted | Rate limit hit | Metrics | Backoff, queue |
| Code | Use Case |
|---|---|
| OK | Success |
| INVALID_ARGUMENT | Bad request data |
| NOT_FOUND | Resource doesn't exist |
| DEADLINE_EXCEEDED | Timeout |
| UNAVAILABLE | Service down (retryable) |
| INTERNAL | Server bug |
buf lint| Error | Cause | Fix |
|---|---|---|
connection refused | Service not running | Check deployment, ports |
deadline exceeded | Timeout too short | Increase deadline, optimize |
unimplemented | Method not in server | Regenerate protos |
grpcurl -plaintext localhost:50051 list
grpcurl -plaintext -d '{"id": 1}' localhost:50051 user.v1.UserService/GetUser
go-grpc (PRIMARY)Task(subagent_type="go:07-go-microservices", prompt="Design order service with saga pattern")
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