From 821e788cda6e4e05a01305adcfae301186154ce2 Mon Sep 17 00:00:00 2001
From: Georg Jung <gjung@gimas.net>
Date: Thu, 12 Dec 2019 17:01:07 +0200
Subject: [PATCH] Add PingService

---
 WoL/Services/IPingService.cs | 18 ++++++++++++++++
 WoL/Services/PingService.cs  | 42 ++++++++++++++++++++++++++++++++++++
 WoL/Startup.cs               |  1 +
 3 files changed, 61 insertions(+)
 create mode 100644 WoL/Services/IPingService.cs
 create mode 100644 WoL/Services/PingService.cs

diff --git a/WoL/Services/IPingService.cs b/WoL/Services/IPingService.cs
new file mode 100644
index 0000000..991d453
--- /dev/null
+++ b/WoL/Services/IPingService.cs
@@ -0,0 +1,18 @@
+using System.Net;
+using System.Threading.Tasks;
+
+namespace WoL.Services
+{
+    public interface IPingService
+    {
+        Task<bool> IsReachable(IPAddress ip, int timeout);
+        Task<PingResult> IsReachable(string hostname, int timeout);
+
+        public enum PingResult
+        {
+            Unreachable,
+            HostNotFound,
+            Success
+        }
+    }
+}
\ No newline at end of file
diff --git a/WoL/Services/PingService.cs b/WoL/Services/PingService.cs
new file mode 100644
index 0000000..26079a4
--- /dev/null
+++ b/WoL/Services/PingService.cs
@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Net.NetworkInformation;
+using System.Threading.Tasks;
+using static WoL.Services.IPingService;
+
+namespace WoL.Services
+{
+    public class PingService : IPingService
+    {
+        private IAddressLookupService addressLookupService;
+
+        public PingService(IAddressLookupService addressLookupService)
+        {
+            this.addressLookupService = addressLookupService;
+        }
+
+        public async Task<PingResult> IsReachable(string hostname, int timeout)
+        {
+            await Task.Delay(1000);
+            IPAddress ip;
+            try
+            {
+                (ip, _) = await addressLookupService.GetIpAndName(hostname).ConfigureAwait(false);
+            }
+            catch
+            {
+                return PingResult.HostNotFound;
+            }
+            return await IsReachable(ip, timeout).ConfigureAwait(false) ? PingResult.Success : PingResult.Unreachable;
+        }
+
+        public async Task<bool> IsReachable(IPAddress ip, int timeout)
+        {
+            using var ping = new Ping();
+            var reply = await ping.SendPingAsync(ip, timeout).ConfigureAwait(false);
+            return reply.Status == IPStatus.Success;
+        }
+    }
+}
diff --git a/WoL/Startup.cs b/WoL/Startup.cs
index 77c5523..3749e09 100644
--- a/WoL/Startup.cs
+++ b/WoL/Startup.cs
@@ -36,6 +36,7 @@ public void ConfigureServices(IServiceCollection services)
             services.AddServerSideBlazor();
             services.AddTransient<IHostService, HostService>();
             services.AddTransient<IWakeService, WakeService>();
+            services.AddTransient<IPingService, PingService>();
             services.AddTransient<IAddressLookupService, AddressLookupService>();
         }