flatbuffers 代码集成

参考上次的操作，因为默认的不是nodejs 模块友好的，使用了typescript 同时集成了代码

schema

union HttpCommand {

    HttpQuery,

    HttpResultSet,

    HttpError

}

 

table HttpMessage {

    message_id: uint;

    command: HttpCommand;

}

 

table HttpQuery {

    query: string;

}

 

table HttpError {

    error: string;

}

 

table HttpResultSet {

    columns: [string];

    rows: [HttpRow];

}

 

table HttpRow {

    values: [HttpColumnValue];

}

 

table HttpColumnValue {

    string_value: string;

}

root_type HttpMessage;

生成代码

flatc --ts http_message.fbs

生成nodejs 模块友好的代码

使用tsc 编译

{

  "name": "first",

  "version": "1.0.0",

  "main": "index.js",

  "license": "MIT",

  "dependencies": {

    "flatbuffers": "^1.12.0"

  },

  "scripts": {

    "watch": "tsc --watch"

  },

  "devDependencies": {

    "@types/flatbuffers": "^1.10.0",

    "typescript": "^4.2.3"

  }

}

代码集成

const flatbuffers = require("flatbuffers").flatbuffers

const {HttpQuery,HttpMessage,HttpCommand} = require("./http_message_generated")

const builder = new flatbuffers.Builder(1024);

const queryOffset = builder.createString("dalongrong");

const httpQueryOffset = HttpQuery.createHttpQuery(builder,queryOffset);

const messageId = 10000

const message = HttpMessage.createHttpMessage(builder, messageId, HttpCommand.HttpQuery, httpQueryOffset);

builder.finish(message);

let msg =builder.asUint8Array()

const buf = new flatbuffers.ByteBuffer(msg);

const myHttpMessage = HttpMessage.getRootAsHttpMessage(buf);

console.log("command:",myHttpMessage.commandType())

if (myHttpMessage.commandType()==HttpCommand.HttpQuery){

    const httpQuery = myHttpMessage.command(new HttpQuery());

    console.log("query:",httpQuery.query())

}

运行效果

 

 

参考资料

https://google.github.io/flatbuffers/flatbuffers_guide_use_typescript.html
https://google.github.io/flatbuffers/flatbuffers_guide_using_schema_compiler.html