FPGA_WebLab/server/udpServer.ts

import _ from "lodash"
import { type udp } from "bun"
import type { UDPDataType } from "./udp";
import { None, Some, type Option } from "ts-results-es";
import { z } from "zod";

// Bun Data Type
interface BinaryTypeList {
  arraybuffer: ArrayBuffer;
  buffer: Buffer;
  uint8array: Uint8Array;
}
type BinaryType = keyof BinaryTypeList;

const receivedData: Map<string, Array<{
  body: udp.Data,
  port: number,
  date: string
}>> = new Map()

const udpServer = await Bun.udpSocket({
  port: 33000,
  socket: {
    data(
      _socket: udp.Socket<BinaryType>,
      data: BinaryTypeList[BinaryType],
      port: number,
      address: string,
    ) {
      // Add Received Data
      let arrayData = receivedData.get(address)
      if (_.isUndefined(arrayData)) {

      } else {
        receivedData.set(address, [])
        arrayData.push({
          body: data,
          port: port,
          date: new Date().toUTCString()
        })
      }
    }
  }
})

function port(): number {
  return udpServer.port
}

function lastestData(address: string): Option<UDPDataType<udp.Data>> {
  if (!z.string().ip().safeParse(address).success) {
    return None
  }

  const arrayData = receivedData.get(address)
  if (_.isUndefined(arrayData)) {
    return None
  }

  const data = arrayData.pop()
  if (_.isUndefined(data)) {
    return None
  }

  return Some({
    address: address,
    body: data.body,
    port: data.port,
    date: data.date,
  })
}

function oldestData(address: string): Option<UDPDataType<udp.Data>> {
  if (!z.string().ip().safeParse(address).success) {
    return None
  }

  const arrayData = receivedData.get(address)
  if (_.isUndefined(arrayData)) {
    return None
  }

  const data = arrayData.shift()
  if (_.isUndefined(data)) {
    return None
  }

  return Some({
    address: address,
    body: data.body,
    port: data.port,
    date: data.date,
  })
}

export { port, lastestData, oldestData }