reachable 
Network reachability functions for client side Go network code
Package reachable adds utility methods to notify when a network connection to a remote host is up or down. This is intended for long-running programs on systems that might have intermittent network access (e.g. laptops, phones, remote embedded systems, etc).
Quick Start
// check if google.com is reachable every 5 minutes
reachable.DefaultInterval = time.Minute*5
reachable.Start("google.com")
defer reachable.Stop()
// ...
// about to do network stuff...
if !reachable.NetworkIsReachable() {
log.Println("no network available!")
}Monitoring multiple hosts
This package may also be used to monitor multiple hosts by setting up separate Checker instances:
// these will be updated whenever you need them later
googleIsUp := true
bingIsUp := true
c1 := Checker{
Hostport: "google.com:443",
Notifier: func(r bool) {
googleIsUp = r
},
}
c2 := Checker{
Hostport: "bing.com",
Notifier: func(r bool) {
bingIsUp = r
},
}
// start goroutines that check for reachability
c1.Start()
c2.Start()
// ...License
MIT
