Proof of Concept for using goroutine and channel to accomplish async functionality

async-poc.go

package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
	// create a single channel of size 1
	// the belief is that asyncRes will wait to populate the channel if it has data in it
	// therefore, asyncRes will not overwrite the value of syncChan until the previous data is drained
	syncChan := make(chan resHolder, 1)

	for idx := 0; idx < 10; idx++ {
		go asyncRes(idx, syncChan)
	}

	receivedData := make(map[int]resHolder, 10)

	for idx2 := 0; idx2 < 10; idx2++ {
		getData := <-syncChan
		receivedData[idx2] = getData
	}

	fmt.Println("Contents of receivedData:")
	fmt.Printf("%+v\n", receivedData)
}

type resHolder struct {
	randNum int64
	ord     int
}

func asyncRes(ord int, sendRes chan resHolder) {
	// i am surprised there is no need to close the channel
	rand.Seed(time.Now().UnixNano())

	randInt := rand.Int63()%1000 + 1

	time.Sleep(time.Duration(randInt) * time.Millisecond)

	sendData := resHolder{randNum: randInt, ord: ord}
	sendRes <- sendData
}