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//
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syntax = "proto3";

package grpc;

// Interface exported by the server.
service Metadata {
  // Echo metadata.
  //
  // Echoes the given input as trailer metadata. Sets a call counter as header
  // metadata, and returns the value of the 'hello' key in the client metadata
  // as the result.
  rpc Echo(Record) returns (Record) {}

  // Adds 1 to the numbers in the request stream.
  //
  // Uses bidirectional streaming.
  rpc AddOne(stream Number) returns (stream Number) {}

  // Fibonacci.
  //
  // Streams Fibonacci numbers until the call is canceled or times out.
  rpc Fibonacci(Empty) returns (stream Number) {}
}

// A message containing a single string value.
message Record {
  string value = 1;
}

// A message containing a single number.
message Number {
  int32 value = 1;
}

// A message containing nothing.
message Empty {
}