syntax = "proto3";

package math;

message DivArgs {
  optional int64 dividend = 1;
  optional int64 divisor = 2;
}

message DivReply {
  optional int64 quotient = 1;
  optional int64 remainder = 2;
}

message FibArgs {
  optional int64 limit = 1;
}

message Num {
  optional int64 num = 1;
}

message FibReply {
  optional int64 count = 1;
}

service Math {
  // Div divides args.dividend by args.divisor and returns the quotient and
  // remainder.
  rpc Div (DivArgs) returns (DivReply) {
  }

  // DivMany accepts an arbitrary number of division args from the client stream
  // and sends back the results in the reply stream.  The stream continues until
  // the client closes its end; the server does the same after sending all the
  // replies.  The stream ends immediately if either end aborts.
  rpc DivMany (stream DivArgs) returns (stream DivReply) {
  }

  // Fib generates numbers in the Fibonacci sequence.  If args.limit > 0, Fib
  // generates up to limit numbers; otherwise it continues until the call is
  // canceled.  Unlike Fib above, Fib has no final FibReply.
  rpc Fib (FibArgs) returns (stream Num) {
  }

  // Sum sums a stream of numbers, returning the final result once the stream
  // is closed.
  rpc Sum (stream Num) returns (Num) {
  }
}
