Work on #61: Add support for ICMP

+ Update dependencies

client/client.go

@@ -5,6 +5,8 @@ import (
 	"net"
 	"net/http"
 	"time"
+
+	"github.com/go-ping/ping"
 )
 
 var (
@@ -31,7 +33,7 @@ func GetHTTPClient(insecure bool) *http.Client {
 	}
 	if secureHTTPClient == nil {
 		secureHTTPClient = &http.Client{
-			Timeout: time.Second * 10,
+			Timeout: 10 * time.Second,
 			Transport: &http.Transport{
 				MaxIdleConns:        100,
 				MaxIdleConnsPerHost: 20,
@@ -41,8 +43,8 @@ func GetHTTPClient(insecure bool) *http.Client {
 	return secureHTTPClient
 }
 
-// CanCreateConnectionToTCPService checks whether a connection can be established with a TCP service
-func CanCreateConnectionToTCPService(address string) bool {
+// CanCreateTCPConnection checks whether a connection can be established with a TCP service
+func CanCreateTCPConnection(address string) bool {
 	conn, err := net.DialTimeout("tcp", address, 5*time.Second)
 	if err != nil {
 		return false
@@ -50,3 +52,21 @@ func CanCreateConnectionToTCPService(address string) bool {
 	_ = conn.Close()
 	return true
 }
+
+// CanPing checks if an address can be pinged
+// Note that this function takes at least 100ms, even if the address is 127.0.0.1
+func CanPing(address string) bool {
+	pinger, err := ping.NewPinger(address)
+	if err != nil {
+		return false
+	}
+	pinger.Count = 1
+	pinger.Timeout = 5 * time.Second
+	pinger.SetNetwork("ip4")
+	pinger.SetPrivileged(true)
+	err = pinger.Run()
+	if err != nil {
+		return false
+	}
+	return true
+}