gRPC server-side streaming in Go - service definition

transaction.proto

syntax = "proto3";

package bank;

option go_package = "github.com/jasonsalas/protobank";

import "google/protobuf/timestamp.proto";

message Transaction {
    enum Operation {
        Credit = 0;
        Debit = 1;
    }

    google.protobuf.Timestamp time = 1;
    Operation operation = 2;
    double amount = 3;
}

message FetchRequest {
    string accountId = 1;
}

message FetchResponse {
    // this could be repeated, as well
    Transaction transaction = 1;
}

service TransactionService {
    rpc Fetch(FetchRequest) returns (stream FetchResponse) {};
}