问如何用.proto文件在node.js中解码编码的协议缓冲区数据

EN

const protobuf = require("protobufjs");

async function encodeTestMessage(payload) {
    const root = await protobuf.load("test.proto");
    const testMessage = root.lookupType("testpackage.testMessage");
    const message = testMessage.create(payload);
    return testMessage.encode(message).finish();
}

async function decodeTestMessage(buffer) {
    const root = await protobuf.load("test.proto");
    const testMessage = root.lookupType("testpackage.testMessage");
    const err = testMessage.verify(buffer);
    if (err) {
        throw err;
    }
    const message = testMessage.decode(buffer);
    return testMessage.toObject(message);
}

async function testProtobuf() {
    const payload = { timestamp: Math.round(new Date().getTime() / 1000), message: "A rose by any other name would smell as sweet" };
    console.log("Test message:", payload);
    const buffer = await encodeTestMessage(payload);
    console.log(`Encoded message (${buffer.length} bytes): `, buffer.toString("hex"));
    const decodedMessage = await decodeTestMessage(buffer);
    console.log("Decoded test message:", decodedMessage);
}

testProtobuf();

package testpackage;
syntax = "proto3";

message testMessage {
    uint32 timestamp = 1;
    string message = 2;
}