protocol-buffters

关于protocol-buffers的语法可以在：
https://developers.google.com/protocol-buffers/docs/proto3
找到，只介绍proto3的语法。

syntax = "proto3";


service Greeter {
    rpc say_hello (hello_request) returns (hello_reply) {
    }
    rpc say_hello_again (hello_request) returns (hello_reply) {
    }
}

message hello_request {
    string name = 1;
    int32 age = 2;
    enum Gender {
        MALE = 0;
        FEMALE = 1;
        UNKNOWN = 2;
    }

    Gender gender = 3;

    repeated string school = 4; // type: list school=["a","b"]
    map<string,string> other = 6; // type: dict other = {"a":"b"}

    /*
        [
            {
                "name": "第一家",
                "address": "address1"
            },
            {
                "name": "第二家",
                "address": "address2"
            }
        ]

    */
    repeated Supermarket supermarket = 7;
}

message Supermarket {
    string name = 1;
    string address = 2;
}

message hello_reply {
    string message = 1;
}

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