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httpGoroutine.go
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httpGoroutine.go
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package main
import (
"fmt"
"net/http"
)
//Performs HTTP Head on a given URL and channels in the content-length from the HTTP Head Response Headers
func getContents(url string, c chan map[string]int64 ){
//HTTP Head on a URL
resp,err :=http.Head(url)
//Map < URL->ContentLength >
result := make(map[string]int64)
if err == nil{
result[url] =resp.ContentLength
//Channeling in ContentLength with the URL as the key
c <- result
}
}
func DemoURLs(){
arr := [...]string{"http://ppcdn.500px.org/53472962/016dc8008e0e1b0a71437a18ec4ef502c0e69cf6/5.jpg", "http://ppcdn.500px.org/53498178/0d13aa906538a8021568b948edfe3a3b3343dcf2/5.jpg", "http://ppcdn.500px.org/53495988/69d5a868beb9a4610e06ad1d64efa10204f8f45c/5.jpg", "http://ppcdn.500px.org/53488670/be88ee3404909ffb5e0f058133c8cb3cb3c61582/5.jpg", "http://ppcdn.500px.org/53472200/d23ece8bf9ab2f405b396edaf38a6ef77aab0c1e/5.jpg", "http://ppcdn.500px.org/53450310/977ea22beefa8c7148b3155bd829209a3ccf3330/5.jpg", "http://ppcdn.500px.org/53503408/5ed549003f8e919a3bf4b55f1e47dfa76ff77218/5.jpg", "http://ppcdn.500px.org/53496530/4a724f69bb4c1cb5e890594967572584f0c405cc/5.jpg", "http://ppcdn.500px.org/53493274/d55f2a1c0e639888d2ac7f20c04d360a18a75511/5.jpg", "http://ppcdn.500px.org/53478682/60a97a27221b471a00d2ea4c8a080cdf05350865/5.jpg", "http://ppcdn.500px.org/53472206/c99f0f1329f9ba908080cfb20def5fae433163da/5.jpg", "http://ppcdn.500px.org/53470904/5b99c63c3f1d1d19e01e73f49e88d72dc5776dca/5.jpg", "http://ppcdn.500px.org/53487620/514a8bb11650e53a25295e05f13e76069ffe982f/5.jpg", "http://ppcdn.500px.org/53471946/eb4244d152527e5f28199e0f822ffb6f9e7307a5/5.jpg", "http://ppcdn.500px.org/53512606/b46b81f293c18870bc537eb29af41176c364b177/5.jpg", "http://ppcdn.500px.org/53508262/b3f1845372b29b7721d45e16e8696e061a229e1c/5.jpg", "http://ppcdn.500px.org/53502718/3b1ab7097f8f1c6e32034f363680c1e08a37ab73/5.jpg", "http://ppcdn.500px.org/53499444/af5315c17755f7cfcc2c58023ecb553984882ce6/5.jpg", "http://ppcdn.500px.org/53497032/eb94e8f8780d3aca740d5e53ad0585419bb792d9/5.jpg", 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lengths := make(map[int]map[string]int64)
contentLengthChannel := make(chan map[string]int64)
for i,url := range arr{
//Spinning off a goroutine which runs asynchronusly
//Although async, each goroutine here communicates
//with this main package's goroutine via the contentLenghtChannel
go getContents(url,contentLengthChannel)
//appending the ContentLength from async goroutine into a simple map
x :=<- contentLengthChannel
lengths[i] = x
}
for _,v := range lengths{
fmt.Println(v)
}
}
func main(){
DemoURLs()
}