embed: add GRPCAdditionalServerOptions config

server/embed/config.go

@@ -284,6 +284,13 @@ type Config struct {
 	// before closing a non-responsive connection. 0 to disable.
 	GRPCKeepAliveTimeout time.Duration `json:"grpc-keepalive-timeout"`
 
+	// GRPCAdditionalServerOptions is the additional server option hook
+	// for changing the default internal gRPC configuration. Note these
+	// additional configurations take precedence over the existing individual
+	// configurations if present. Please refer to
+	// https://github.com/etcd-io/etcd/pull/14066#issuecomment-1248682996
+	GRPCAdditionalServerOptions []grpc.ServerOption `json:"grpc-additional-server-options"`
+
 	// SocketOpts are socket options passed to listener config.
 	SocketOpts transport.SocketOpts `json:"socket-options"`
 

server/embed/etcd.go

@@ -761,6 +761,7 @@ func (e *Etcd) serveClients() {
 			Timeout: e.cfg.GRPCKeepAliveTimeout,
 		}))
 	}
+	gopts = append(gopts, e.cfg.GRPCAdditionalServerOptions...)
 
 	splitHTTP := false
 	for _, sctx := range e.sctxs {

tests/framework/integration/cluster.go

@@ -144,14 +144,16 @@ type ClusterConfig struct {
 	QuotaBackendBytes    int64
 	BackendBatchInterval time.Duration
 
-	MaxTxnOps              uint
-	MaxRequestBytes        uint
+	MaxTxnOps       uint
+	MaxRequestBytes uint
+
 	SnapshotCount          uint64
 	SnapshotCatchUpEntries uint64
 
-	GRPCKeepAliveMinTime  time.Duration
-	GRPCKeepAliveInterval time.Duration
-	GRPCKeepAliveTimeout  time.Duration
+	GRPCKeepAliveMinTime        time.Duration
+	GRPCKeepAliveInterval       time.Duration
+	GRPCKeepAliveTimeout        time.Duration
+	GRPCAdditionalServerOptions []grpc.ServerOption
 
 	ClientMaxCallSendMsgSize int
 	ClientMaxCallRecvMsgSize int
@@ -278,6 +280,7 @@ func (c *Cluster) mustNewMember(t testutil.TB) *Member {
 			GRPCKeepAliveMinTime:                c.Cfg.GRPCKeepAliveMinTime,
 			GRPCKeepAliveInterval:               c.Cfg.GRPCKeepAliveInterval,
 			GRPCKeepAliveTimeout:                c.Cfg.GRPCKeepAliveTimeout,
+			GRPCAdditionalServerOptions:         c.Cfg.GRPCAdditionalServerOptions,
 			ClientMaxCallSendMsgSize:            c.Cfg.ClientMaxCallSendMsgSize,
 			ClientMaxCallRecvMsgSize:            c.Cfg.ClientMaxCallRecvMsgSize,
 			UseIP:                               c.Cfg.UseIP,
@@ -603,6 +606,7 @@ type MemberConfig struct {
 	GRPCKeepAliveMinTime        time.Duration
 	GRPCKeepAliveInterval       time.Duration
 	GRPCKeepAliveTimeout        time.Duration
+	GRPCAdditionalServerOptions []grpc.ServerOption
 	ClientMaxCallSendMsgSize    int
 	ClientMaxCallRecvMsgSize    int
 	UseIP                       bool
@@ -709,6 +713,7 @@ func MustNewMember(t testutil.TB, mcfg MemberConfig) *Member {
 			Timeout: mcfg.GRPCKeepAliveTimeout,
 		}))
 	}
+	m.GRPCServerOpts = append(m.GRPCServerOpts, mcfg.GRPCAdditionalServerOptions...)
 	m.ClientMaxCallSendMsgSize = mcfg.ClientMaxCallSendMsgSize
 	m.ClientMaxCallRecvMsgSize = mcfg.ClientMaxCallRecvMsgSize
 	m.UseIP = mcfg.UseIP

tests/integration/clientv3/kv_test.go

@@ -702,14 +702,12 @@ func TestKVLargeRequests(t *testing.T) {
 		// without proper client-side receive size limit
 		// "code = ResourceExhausted desc = grpc: received message larger than max (5242929 vs. 4194304)"
 		{
-
 			maxRequestBytesServer:  7*1024*1024 + 512*1024,
 			maxCallSendBytesClient: 7 * 1024 * 1024,
 			maxCallRecvBytesClient: 0,
 			valueSize:              5 * 1024 * 1024,
 			expectError:            nil,
 		},
-
 		{
 			maxRequestBytesServer:  10 * 1024 * 1024,
 			maxCallSendBytesClient: 100 * 1024 * 1024,

tests/integration/v3_grpc_test.go

@@ -1923,7 +1923,71 @@ func TestV3LargeRequests(t *testing.T) {
 					t.Errorf("#%d: range expected no error, got %v", i, err)
 				}
 			}
+		})
+	}
+}
 
+// TestV3AdditionalGRPCOptions ensures that configurable GRPCAdditionalServerOptions works as intended.
+func TestV3AdditionalGRPCOptions(t *testing.T) {
+	integration.BeforeTest(t)
+	tests := []struct {
+		name            string
+		maxRequestBytes uint
+		grpcOpts        []grpc.ServerOption
+		valueSize       int
+		expectError     error
+	}{
+		{
+			name:            "requests will get a gRPC error because it's larger than gRPC MaxRecvMsgSize",
+			maxRequestBytes: 8 * 1024 * 1024,
+			grpcOpts:        nil,
+			valueSize:       9 * 1024 * 1024,
+			expectError:     status.Errorf(codes.ResourceExhausted, "grpc: received message larger than max"),
+		},
+		{
+			name:            "requests will get an etcd custom gRPC error because it's larger than MaxRequestBytes",
+			maxRequestBytes: 8 * 1024 * 1024,
+			grpcOpts:        []grpc.ServerOption{grpc.MaxRecvMsgSize(10 * 1024 * 1024)},
+			valueSize:       9 * 1024 * 1024,
+			expectError:     rpctypes.ErrGRPCRequestTooLarge,
+		},
+		{
+			name:            "requests size is smaller than MaxRequestBytes but larger than MaxRecvMsgSize",
+			maxRequestBytes: 8 * 1024 * 1024,
+			grpcOpts:        []grpc.ServerOption{grpc.MaxRecvMsgSize(4 * 1024 * 1024)},
+			valueSize:       6 * 1024 * 1024,
+			expectError:     status.Errorf(codes.ResourceExhausted, "grpc: received message larger than max"),
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			clus := integration.NewCluster(t, &integration.ClusterConfig{
+				Size:                        1,
+				MaxRequestBytes:             test.maxRequestBytes,
+				ClientMaxCallSendMsgSize:    12 * 1024 * 1024,
+				GRPCAdditionalServerOptions: test.grpcOpts,
+			})
+			defer clus.Terminate(t)
+			kvcli := integration.ToGRPC(clus.Client(0)).KV
+			reqput := &pb.PutRequest{Key: []byte("foo"), Value: make([]byte, test.valueSize)}
+			if _, err := kvcli.Put(context.TODO(), reqput); err != nil {
+				if _, ok := err.(rpctypes.EtcdError); ok {
+					if err.Error() != status.Convert(test.expectError).Message() {
+						t.Errorf("expected %v, got %v", status.Convert(test.expectError).Message(), err.Error())
+					}
+				} else if !strings.HasPrefix(err.Error(), test.expectError.Error()) {
+					t.Errorf("expected error starting with '%s', got '%s'", test.expectError.Error(), err.Error())
+				}
+			}
+			// request went through, expect large response back from server
+			if test.expectError == nil {
+				reqget := &pb.RangeRequest{Key: []byte("foo")}
+				// limit receive call size with original value + gRPC overhead bytes
+				_, err := kvcli.Range(context.TODO(), reqget, grpc.MaxCallRecvMsgSize(test.valueSize+512*1024))
+				if err != nil {
+					t.Errorf("range expected no error, got %v", err)
+				}
+			}
 		})
 	}
 }