Przykładowa definicja usługi

calculator.proto

syntax = "proto3";

option java_package = "pl.cafebabe.calculator";
option java_multiple_files = true;
option go_package = "cafebabe.pl/calculator;calculator";

message AddRequest {
  int64 a = 1;
  int64 b = 2;
}

message AddResponse {
  int64 result = 1;
}

message SumRequest {
  repeated int64 x = 1;
}

message SumResponse {
  int64 result = 1;
}

message PrimeNumberDecompositionRequest {
  int64 number = 1;
}

message PrimeNumberDecompositionResponse {
  int64 number = 1;
}

message ComputeAverageRequest {
  int32 number = 1;
}

message ComputeAverageResponse {
  double average = 1;
}

message FindMaximumRequest {
  int32 number = 1;
}

message FindMaximumResponse {
  int32 maximum = 1;
}

message SquareRootRequest {
  int32 number = 1;
}

message SquareRootResponse {
  double value = 1;
}

service CalculatorService {
  rpc Add(AddRequest) returns (AddResponse);
  rpc Sum(SumRequest) returns (SumResponse);
  rpc PrimeNumberDecomposition(PrimeNumberDecompositionRequest) returns (stream PrimeNumberDecompositionResponse);
  rpc ComputeAverage(stream ComputeAverageRequest) returns (ComputeAverageResponse);
  rpc FindMaximum(stream FindMaximumRequest) returns (stream FindMaximumResponse);
  rpc SquareRoot(SquareRootRequest) returns (SquareRootResponse);
}