update proto files

5 files changed, 32 insertions, 32 deletions

diff --git a/src/csharp/Grpc.Examples/proto/math.proto b/src/csharp/Grpc.Examples/proto/math.proto
index 5485d580c3..311e148c02 100644
--- a/src/csharp/Grpc.Examples/proto/math.proto
+++ b/src/csharp/Grpc.Examples/proto/math.proto
@@ -28,30 +28,30 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-syntax = "proto2";
+syntax = "proto3";
 
 package math;
 
 message DivArgs {
-  optional int64 dividend = 1;
-  optional int64 divisor = 2;
+  int64 dividend = 1;
+  int64 divisor = 2;
 }
 
 message DivReply {
-  optional int64 quotient = 1;
-  optional int64 remainder = 2;
+  int64 quotient = 1;
+  int64 remainder = 2;
 }
 
 message FibArgs {
-  optional int64 limit = 1;
+  int64 limit = 1;
 }
 
 message Num {
-  optional int64 num = 1;
+  int64 num = 1;
 }
 
 message FibReply {
-  optional int64 count = 1;
+  int64 count = 1;
 }
 
 service Math {
diff --git a/src/csharp/Grpc.HealthCheck/proto/health.proto b/src/csharp/Grpc.HealthCheck/proto/health.proto
index 08df7e104e..01aa3fcf57 100644
--- a/src/csharp/Grpc.HealthCheck/proto/health.proto
+++ b/src/csharp/Grpc.HealthCheck/proto/health.proto
@@ -28,14 +28,14 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // TODO(jtattermusch): switch to proto3 once C# supports that.
-syntax = "proto2";
+syntax = "proto3";
 
 package grpc.health.v1alpha;
 option csharp_namespace = "Grpc.Health.V1Alpha";
 
 message HealthCheckRequest {
-  optional string host = 1;
-  optional string service = 2;
+  string host = 1;
+  string service = 2;
 }
 
 message HealthCheckResponse {
@@ -44,7 +44,7 @@ message HealthCheckResponse {
     SERVING = 1;
     NOT_SERVING = 2;
   }
-  optional ServingStatus status = 1;
+  ServingStatus status = 1;
 }
 
 service Health {
diff --git a/src/csharp/Grpc.IntegrationTesting/proto/empty.proto b/src/csharp/Grpc.IntegrationTesting/proto/empty.proto
index 4295a0a960..6d0eb937d6 100644
--- a/src/csharp/Grpc.IntegrationTesting/proto/empty.proto
+++ b/src/csharp/Grpc.IntegrationTesting/proto/empty.proto
@@ -28,7 +28,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-syntax = "proto2";
+syntax = "proto3";
 
 package grpc.testing;
 
diff --git a/src/csharp/Grpc.IntegrationTesting/proto/messages.proto b/src/csharp/Grpc.IntegrationTesting/proto/messages.proto
index 65a8140465..7df85e3c13 100644
--- a/src/csharp/Grpc.IntegrationTesting/proto/messages.proto
+++ b/src/csharp/Grpc.IntegrationTesting/proto/messages.proto
@@ -30,7 +30,7 @@
 
 // Message definitions to be used by integration test service definitions.
 
-syntax = "proto2";
+syntax = "proto3";
 
 package grpc.testing;
 
@@ -49,46 +49,46 @@ enum PayloadType {
 // A block of data, to simply increase gRPC message size.
 message Payload {
   // The type of data in body.
-  optional PayloadType type = 1;
+  PayloadType type = 1;
   // Primary contents of payload.
-  optional bytes body = 2;
+  bytes body = 2;
 }
 
 // Unary request.
 message SimpleRequest {
   // Desired payload type in the response from the server.
   // If response_type is RANDOM, server randomly chooses one from other formats.
-  optional PayloadType response_type = 1;
+  PayloadType response_type = 1;
 
   // Desired payload size in the response from the server.
   // If response_type is COMPRESSABLE, this denotes the size before compression.
-  optional int32 response_size = 2;
+  int32 response_size = 2;
 
   // Optional input payload sent along with the request.
-  optional Payload payload = 3;
+  Payload payload = 3;
 
   // Whether SimpleResponse should include username.
-  optional bool fill_username = 4;
+  bool fill_username = 4;
 
   // Whether SimpleResponse should include OAuth scope.
-  optional bool fill_oauth_scope = 5;
+  bool fill_oauth_scope = 5;
 }
 
 // Unary response, as configured by the request.
 message SimpleResponse {
   // Payload to increase message size.
-  optional Payload payload = 1;
+  Payload payload = 1;
   // The user the request came from, for verifying authentication was
   // successful when the client expected it.
-  optional string username = 2;
+  string username = 2;
   // OAuth scope.
-  optional string oauth_scope = 3;
+  string oauth_scope = 3;
 }
 
 // Client-streaming request.
 message StreamingInputCallRequest {
   // Optional input payload sent along with the request.
-  optional Payload payload = 1;
+  Payload payload = 1;
 
   // Not expecting any payload from the response.
 }
@@ -96,18 +96,18 @@ message StreamingInputCallRequest {
 // Client-streaming response.
 message StreamingInputCallResponse {
   // Aggregated size of payloads received from the client.
-  optional int32 aggregated_payload_size = 1;
+  int32 aggregated_payload_size = 1;
 }
 
 // Configuration for a particular response.
 message ResponseParameters {
   // Desired payload sizes in responses from the server.
   // If response_type is COMPRESSABLE, this denotes the size before compression.
-  optional int32 size = 1;
+  int32 size = 1;
 
   // Desired interval between consecutive responses in the response stream in
   // microseconds.
-  optional int32 interval_us = 2;
+  int32 interval_us = 2;
 }
 
 // Server-streaming request.
@@ -116,17 +116,17 @@ message StreamingOutputCallRequest {
   // If response_type is RANDOM, the payload from each response in the stream
   // might be of different types. This is to simulate a mixed type of payload
   // stream.
-  optional PayloadType response_type = 1;
+  PayloadType response_type = 1;
 
   // Configuration for each expected response message.
   repeated ResponseParameters response_parameters = 2;
 
   // Optional input payload sent along with the request.
-  optional Payload payload = 3;
+  Payload payload = 3;
 }
 
 // Server-streaming response, as configured by the request and parameters.
 message StreamingOutputCallResponse {
   // Payload to increase response size.
-  optional Payload payload = 1;
+  Payload payload = 1;
 }
diff --git a/src/csharp/Grpc.IntegrationTesting/proto/test.proto b/src/csharp/Grpc.IntegrationTesting/proto/test.proto
index 927a3a83aa..f9e0d2a039 100644
--- a/src/csharp/Grpc.IntegrationTesting/proto/test.proto
+++ b/src/csharp/Grpc.IntegrationTesting/proto/test.proto
@@ -30,7 +30,7 @@
 
 // An integration test service that covers all the method signature permutations
 // of unary/streaming requests/responses.
-syntax = "proto2";
+syntax = "proto3";
 
 import "empty.proto";
 import "messages.proto";