环境
- Time 2022-12-10
- WSL-Ubuntu 22.04
- prost 0.11
前言
说明
参考：https://docs.rs/prost-build/latest/prost_build/
目标
在前一节的基础上，使用 prost 进行编码。
user.proto 文件
syntax = "proto3";
package user;
// 用户
message User{uint64 id = 1; // 编号string name = 2; // 用户名uint32 age = 3; // 年龄
}
Cargo.toml
[package]
edition = "2021"
name = "game"
version = "1.0.0"[dependencies]
prost = "0.11"[build-dependencies]
prost-build = "0.11"
mod.rs
mod user;pub use user::*;
user.rs
/// 用户
#[derive(Clone, PartialEq, ::prost::Message)]
pub struct User {/// 编号#[prost(uint64, tag = "1")]pub id: u64,/// 用户名#[prost(string, tag = "2")]pub name: ::prost::alloc::string::String,/// 年龄#[prost(uint32, tag = "3")]pub age: u32,
}
main.rs
use prost::Message;mod proto;fn main() {let user = proto::User {id: 1,name: "JiangBo".to_string(),age: 44,};let encode = user.encode_to_vec();println!("encode: {encode:?}, encode length: {}, length: {}",user.encoded_len(),encode.len());
}
运行结果
encode: [8, 1, 18, 7, 74, 105, 97, 110, 103, 66, 111, 24, 44], encode length: 13, length: 13
总结
使用 prost 来进行编码，得到了编码后的字节和长度。