syntax = "proto3";

package echo;

// EchoRequest is the request for echo.
message EchoRequest {
    string message = 1;
}

// EchoResponse is the response for echo.
message EchoResponse {
    string message = 1;
}

// Echo is the echo service.
service Echo {
    // UnaryEcho is unary echo.
    rpc UnaryEcho(EchoRequest) returns (EchoResponse) {}

    // ServerStreamingEcho is server side streaming.
    rpc ServerStreamingEcho(EchoRequest) returns (stream EchoResponse) {}

    // ClientStreamingEcho is client side streaming.
    rpc ClientStreamingEcho(stream EchoRequest) returns (EchoResponse) {}

    // BidirectionalStreamingEcho is bidi streaming.
    rpc BidirectionalStreamingEcho(stream EchoRequest)
        returns (stream EchoResponse) {}
}