Add target and generated code for QPS (#1827)

Motivation:

The first step in implementing QPS testing for V2 is to add the proto files representing
the services and messages used in QPS and generating the code for them.

Modifications:

- Modified the fetch script to add the proto files we need
- Modified the generate script to generate code for them
-Created executable target for QPS worker

Result:

We can start implementing the performance worker.

Author: stefanadranca

Package.swift

@@ -91,6 +91,7 @@ extension Target.Dependency {
   static let grpc: Self = .target(name: grpcTargetName)
   static let cgrpcZlib: Self = .target(name: cgrpcZlibTargetName)
   static let protocGenGRPCSwift: Self = .target(name: "protoc-gen-grpc-swift")
+  static let performanceWorker: Self = .target(name: "performance-worker")
   static let reflectionService: Self = .target(name: "GRPCReflectionService")
   static let grpcCodeGen: Self = .target(name: "GRPCCodeGen")
   static let grpcProtobuf: Self = .target(name: "GRPCProtobuf")
@@ -245,6 +246,14 @@ extension Target {
     ]
   )
 
+  static let performanceWorker: Target = .executableTarget(
+    name: "performance-worker",
+    dependencies: [
+      .grpcCore,
+      .grpcProtobuf
+    ]
+  )
+    
   static let grpcSwiftPlugin: Target = .plugin(
     name: "GRPCSwiftPlugin",
     capability: .buildTool(),
@@ -722,6 +731,7 @@ let package = Package(
     .grpcProtobuf,
     .grpcProtobufCodeGen,
     .interoperabilityTestImplementation,
+    .performanceWorker,
 
     // v2 tests
     .grpcCoreTests,

Protos/fetch.sh

@@ -31,14 +31,22 @@ rm -rf "$upstream"
 
 # Create new directories to poulate. These are based on proto package name
 # rather than source repository name.
-mkdir -p "$upstream/grpc"
 mkdir -p "$upstream/google"
+mkdir -p "$upstream/grpc/testing"
+mkdir -p "$upstream/grpc/core"
 
 # Copy over the grpc-proto protos.
 cp -rp "$checkouts/grpc-proto/grpc/service_config" "$upstream/grpc/service_config"
 cp -rp "$checkouts/grpc-proto/grpc/lookup" "$upstream/grpc/lookup"
 cp -rp "$checkouts/grpc-proto/grpc/reflection" "$upstream/grpc/reflection"
 cp -rp "$checkouts/grpc-proto/grpc/examples" "$upstream/grpc/examples"
+cp -rp "$checkouts/grpc-proto/grpc/testing/benchmark_service.proto" "$upstream/grpc/testing/benchmark_service.proto"
+cp -rp "$checkouts/grpc-proto/grpc/testing/messages.proto" "$upstream/grpc/testing/messages.proto"
+cp -rp "$checkouts/grpc-proto/grpc/testing/worker_service.proto" "$upstream/grpc/testing/worker_service.proto"
+cp -rp "$checkouts/grpc-proto/grpc/testing/control.proto" "$upstream/grpc/testing/control.proto"
+cp -rp "$checkouts/grpc-proto/grpc/testing/payloads.proto" "$upstream/grpc/testing/payloads.proto"
+cp -rp "$checkouts/grpc-proto/grpc/testing/stats.proto" "$upstream/grpc/testing/stats.proto"
+cp -rp "$checkouts/grpc-proto/grpc/core/stats.proto" "$upstream/grpc/core/stats.proto"
 
 # Copy over the googleapis protos.
 mkdir -p "$upstream/google/rpc"

Protos/generate.sh

@@ -201,6 +201,29 @@ function generate_service_messages_interop_tests {
   done
 }
 
+function generate_worker_service {
+  local protos=(
+    "$here/upstream/grpc/testing/payloads.proto"
+    "$here/upstream/grpc/testing/control.proto"
+    "$here/upstream/grpc/testing/messages.proto"
+    "$here/upstream/grpc/testing/stats.proto"
+    "$here/upstream/grpc/testing/benchmark_service.proto"
+    "$here/upstream/grpc/testing/worker_service.proto"
+  )
+  local output="$root/Sources/performance-worker/Generated"
+  
+  generate_message "$here/upstream/grpc/core/stats.proto" "$here/upstream" "$output" "Visibility=Internal" "FileNaming=PathToUnderscores"
+
+  for proto in "${protos[@]}"; do
+    generate_message "$proto" "$here/upstream" "$output" "Visibility=Internal" "FileNaming=PathToUnderscores"
+    if [ "$proto" == "$here/upstream/grpc/testing/worker_service.proto" ]; then
+      generate_grpc "$proto" "$here/upstream" "$output" "Visibility=Internal" "Client=false" "_V2=true" "FileNaming=PathToUnderscores"
+    else
+      generate_grpc "$proto" "$here/upstream" "$output" "Visibility=Internal" "_V2=true" "FileNaming=PathToUnderscores"
+    fi
+  done
+}
+
 #------------------------------------------------------------------------------
 
 # Examples
@@ -220,3 +243,6 @@ generate_service_messages_interop_tests
 # Misc. tests
 generate_normalization_for_tests
 generate_rpc_code_for_tests
+
+# Performance worker service
+generate_worker_service

Protos/upstream/grpc/core/stats.proto

@@ -0,0 +1,38 @@
+// Copyright 2017 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package grpc.core;
+
+message Bucket {
+  double start = 1;
+  uint64 count = 2;
+}
+
+message Histogram {
+  repeated Bucket buckets = 1;
+}
+
+message Metric {
+  string name = 1;
+  oneof value {
+    uint64 count = 10;
+    Histogram histogram = 11;
+  }
+}
+
+message Stats {
+  repeated Metric metrics = 1;
+}

Protos/upstream/grpc/testing/benchmark_service.proto

@@ -0,0 +1,48 @@
+// Copyright 2015 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// An integration test service that covers all the method signature permutations
+// of unary/streaming requests/responses.
+syntax = "proto3";
+
+import "grpc/testing/messages.proto";
+
+package grpc.testing;
+
+option java_multiple_files = true;
+option java_package = "io.grpc.testing";
+option java_outer_classname = "BenchmarkServiceProto";
+
+service BenchmarkService {
+  // One request followed by one response.
+  // The server returns the client payload as-is.
+  rpc UnaryCall(SimpleRequest) returns (SimpleResponse);
+
+  // Repeated sequence of one request followed by one response.
+  // Should be called streaming ping-pong
+  // The server returns the client payload as-is on each response
+  rpc StreamingCall(stream SimpleRequest) returns (stream SimpleResponse);
+
+  // Single-sided unbounded streaming from client to server
+  // The server returns the client payload as-is once the client does WritesDone
+  rpc StreamingFromClient(stream SimpleRequest) returns (SimpleResponse);
+
+  // Single-sided unbounded streaming from server to client
+  // The server repeatedly returns the client payload as-is
+  rpc StreamingFromServer(SimpleRequest) returns (stream SimpleResponse);
+
+  // Two-sided unbounded streaming between server to client
+  // Both sides send the content of their own choice to the other
+  rpc StreamingBothWays(stream SimpleRequest) returns (stream SimpleResponse);
+}