quickie rewrite of Python's asyncio http://www.giantflyingsaucer.com/blog/?p=5557 in Go

asyncfetch.go

// quickie rewrite of http://www.giantflyingsaucer.com/blog/?p=5557 in Go
package main

import (
	"fmt"
	"io/ioutil"
	"net/http"
)

func fetch_page(url string) chan bool {
	c := make(chan bool)

	go func(url string, c chan bool) {
		response, err := http.Get(url)
		if err != nil {
			c <- false
		} else {
			body, _ := ioutil.ReadAll(response.Body)
			fmt.Println("URL:", url, "Content: ", string(body))
			c <- true
		}
	}(url, c)

	// c is essentially a Future
	return c
}

func main() {
	tasks := []chan bool{
		fetch_page("http://google.com"),
		fetch_page("http://cnn.com"),
		fetch_page("http://twitter.com"),
	}

	for _, task := range tasks {
		// synchronous wait, but since fetch_page() is running as a goroutine, results
		// get printed asynchronously.
		// Yes, we can and probably should use sync.WaitGroup, but it'll look different from
		// python's asyncio example at http://www.giantflyingsaucer.com/blog/?p=5557
		<-task
		close(task)
	}
}