[PM-1675] Timeout or transient error when verifying domains (#2835)

* Increased timeout of the dns resolve method and changed the lifetime of the dnsResolverService to scoped

* Reverted to using singleton as this was recommneded on the docs and also registered lookup client as a singleton

* Registerered a singleton service of ILookupClient

* replaced unused serviceProvider with a discard

src/Core/OrganizationFeatures/OrganizationDomains/VerifyOrganizationDomainCommand.cs

@@ -60,7 +60,8 @@ public class VerifyOrganizationDomainCommand : IVerifyOrganizationDomainCommand
         }
         catch (Exception e)
         {
-            _logger.LogError("Error verifying Organization domain. {errorMessage}", e.Message);
+            _logger.LogError("Error verifying Organization domain: {domain}. {errorMessage}",
+                domain.DomainName, e.Message);
         }
 
         domain.SetLastCheckedDate();

src/Core/Services/Implementations/DnsResolverService.cs

@@ -5,10 +5,15 @@ namespace Bit.Core.Services;
 
 public class DnsResolverService : IDnsResolverService
 {
+    private readonly ILookupClient _client;
+
+    public DnsResolverService(ILookupClient client)
+    {
+        _client = client;
+    }
     public async Task<bool> ResolveAsync(string domain, string txtRecord, CancellationToken cancellationToken = default)
     {
-        var lookup = new LookupClient();
+        var result = await _client.QueryAsync(new DnsQuestion(domain, QueryType.TXT), cancellationToken);
-        var result = await lookup.QueryAsync(new DnsQuestion(domain, QueryType.TXT), cancellationToken);
         if (!result.HasError)
         {
             return result.Answers.TxtRecords()

src/SharedWeb/Utilities/ServiceCollectionExtensions.cs

@@ -19,6 +19,7 @@ using Bit.Core.Utilities;
 using Bit.Core.Vault.Services;
 using Bit.Infrastructure.Dapper;
 using Bit.Infrastructure.EntityFramework;
+using DnsClient;
 using IdentityModel;
 using IdentityServer4.AccessTokenValidation;
 using IdentityServer4.Configuration;
@@ -176,6 +177,11 @@ public static class ServiceCollectionExtensions
         services.AddSingleton<IStripeSyncService, StripeSyncService>();
         services.AddSingleton<IMailService, HandlebarsMailService>();
         services.AddSingleton<ILicensingService, LicensingService>();
+        services.AddSingleton<ILookupClient>(_ =>
+        {
+            var options = new LookupClientOptions { Timeout = TimeSpan.FromSeconds(15) };
+            return new LookupClient(options);
+        });
         services.AddSingleton<IDnsResolverService, DnsResolverService>();
         services.AddSingleton<IFeatureService, LaunchDarklyFeatureService>();
         services.AddTokenizers();