fix #792 (#873)

zrpc/internal/serverinterceptors/breakerinterceptor.go

@@ -0,0 +1,33 @@
+package serverinterceptors
+
+import (
+	"context"
+
+	"github.com/tal-tech/go-zero/core/breaker"
+	"github.com/tal-tech/go-zero/zrpc/internal/codes"
+	"google.golang.org/grpc"
+)
+
+// StreamBreakerInterceptor is an interceptor that acts as a circuit breaker.
+func StreamBreakerInterceptor(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo,
+	handler grpc.StreamHandler) (err error) {
+	breakerName := info.FullMethod
+	return breaker.DoWithAcceptable(breakerName, func() error {
+		return handler(srv, stream)
+	}, codes.Acceptable)
+}
+
+// UnaryBreakerInterceptor is an interceptor that acts as a circuit breaker.
+func UnaryBreakerInterceptor() grpc.UnaryServerInterceptor {
+	return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo,
+		handler grpc.UnaryHandler) (resp interface{}, err error) {
+		breakerName := info.FullMethod
+		err = breaker.DoWithAcceptable(breakerName, func() error {
+			var err error
+			resp, err = handler(ctx, req)
+			return err
+		}, codes.Acceptable)
+
+		return resp, err
+	}
+}

zrpc/internal/serverinterceptors/breakerinterceptor_test.go

@@ -0,0 +1,31 @@
+package serverinterceptors
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+func TestStreamBreakerInterceptor(t *testing.T) {
+	err := StreamBreakerInterceptor(nil, nil, &grpc.StreamServerInfo{
+		FullMethod: "any",
+	}, func(
+		srv interface{}, stream grpc.ServerStream) error {
+		return status.New(codes.DeadlineExceeded, "any").Err()
+	})
+	assert.NotNil(t, err)
+}
+
+func TestUnaryBreakerInterceptor(t *testing.T) {
+	interceptor := UnaryBreakerInterceptor()
+	_, err := interceptor(nil, nil, &grpc.UnaryServerInfo{
+		FullMethod: "any",
+	}, func(ctx context.Context, req interface{}) (interface{}, error) {
+		return nil, status.New(codes.DeadlineExceeded, "any").Err()
+	})
+	assert.NotNil(t, err)
+}