OSS-665 driver notification (#153)

OSS-665
*  get server nuget version
* get nuget  current version and display message
* get latest NuGet version and compare with current version
Co-authored-by: Gennadii Shestakov <[email protected]>

Author: shestakovg

FaunaDB.Client.Test/PageTest.cs

@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
+using FaunaDB.Client.Utils;
 using FaunaDB.Query;
 using FaunaDB.Types;
 using NUnit.Framework;

FaunaDB.Client/Client/FaunaClient.cs

@@ -8,6 +8,7 @@
 using FaunaDB.Query;
 using FaunaDB.Types;
 using Newtonsoft.Json;
+using FaunaDB.Client.Utils;
 
 namespace FaunaDB.Client
 {
@@ -32,13 +33,15 @@ public class FaunaClient
         /// <param name="endpoint">URL for the FaunaDB server. Defaults to "https://db.fauna.com:443"</param>
         /// <param name="timeout">Timeout for I/O operations. Defaults to 1 minute.</param>
         /// <param name="httpVersion">Version of http. Default value is HttpVersion.Version11, is you use .net core 3.0 and above you can enable http/2 support by passing HttpVersion.Version20</param>
+        /// <param name="checkNewVersion">Check new NuGet package driver version. Default value is true (Check new version).</param>
         public FaunaClient(
             string secret,
             string endpoint = "https://db.fauna.com:443",
             TimeSpan? timeout = null,
             HttpClient httpClient = null,
-            Version httpVersion = null)
-            : this(CreateClient(secret, endpoint, timeout, httpClient, httpVersion))
+            Version httpVersion = null,
+            bool checkNewVersion = true)
+            : this(CreateClient(secret, endpoint, timeout, httpClient, httpVersion, checkNewVersion))
         { }
 
         /// <summary>
@@ -245,10 +248,16 @@ static IClientIO CreateClient(
             string endpoint,
             TimeSpan? timeout = null,
             HttpClient httpClient = null,
-            Version httpVersion = null)
+            Version httpVersion = null,
+            bool checkNewVersion = true)
         {
             secret.AssertNotNull(nameof(secret));
             endpoint.AssertNotNull(nameof(endpoint));
+            
+            if (checkNewVersion && !CheckLatestVersion.AlreadyChecked)
+            {
+                Task.Run(() => CheckLatestVersion.GetVersionAsync());
+            }
 
             return new DefaultClientIO(
                 secret: secret,

FaunaDB.Client/Utils/CheckLatestVersion.cs

@@ -0,0 +1,70 @@
+using System;
+using System.Diagnostics;
+using System.Linq;
+using System.Net;
+using System.Net.Http;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FaunaDB.Client.Utils
+{
+    public class CheckLatestVersion
+    {
+        private const string packageName = "FaunaDB.Client";
+        public static bool AlreadyChecked { get; set; } = false;
+        public static async Task GetVersionAsync()
+        {
+            if (AlreadyChecked) return;
+            var latestNuGetVesrionString = string.Empty;
+            var url = $"https://api.nuget.org/v3-flatcontainer/{packageName}/index.json";
+            try
+            {
+                var httpClient = new HttpClient();
+#if NET45
+                ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
+#endif
+                var response = await httpClient.GetAsync(url);
+                string versionsResponse = await response.Content.ReadAsStringAsync();
+                Newtonsoft.Json.Linq.JObject jObject = Newtonsoft.Json.Linq.JObject.Parse(versionsResponse);
+                var latestNuGetVesrion = ((Newtonsoft.Json.Linq.JArray)jObject.First.First).Children().LastOrDefault();
+                latestNuGetVesrionString = latestNuGetVesrion.ToString();
+                AlreadyChecked = true;
+            }
+            catch(Exception ex)
+            {
+                AlreadyChecked = true;
+                var message = $"Enable to check new Fauna driver version. Exception: {ex.Message}";
+                return;
+            }
+
+            Assembly asm = typeof(CheckLatestVersion).GetTypeInfo().Assembly;
+            var currentVersion =  asm.GetName().Version;
+            var currentVersionString = $"{currentVersion.Major}.{currentVersion.Minor}.{currentVersion.Build}";
+            if (!latestNuGetVesrionString.Equals(currentVersionString))
+            {
+                var message =  GetMessage(latestNuGetVesrionString, currentVersionString);
+                Debug.WriteLine(message);
+                System.Console.WriteLine(message);
+            }
+        }
+
+        private static string GetMessage(string latestNuGetVesrion, string currentVersion)
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.Append("".PadLeft(80, '='));
+            sb.Append(System.Environment.NewLine);
+            sb.Append(System.Environment.NewLine);
+            sb.Append(System.Environment.NewLine);
+            sb.Append($"New fauna version available {currentVersion} -> {latestNuGetVesrion}");
+            sb.Append(System.Environment.NewLine);
+            sb.Append($"Changelog: https://github.com/fauna/faunadb-csharp/blob/master/CHANGELOG.md");
+            sb.Append(System.Environment.NewLine);
+            sb.Append(System.Environment.NewLine);
+            sb.Append(System.Environment.NewLine);
+            sb.Append(System.Environment.NewLine);
+            sb.Append("".PadLeft(80, '='));
+            return sb.ToString();
+        }
+    }
+}