feat: Added configuration method for host name

Vostok.ServiceDiscovery/IReplicaInfoBuilder.cs

@@ -69,6 +69,13 @@ public interface IReplicaInfoBuilder
         [NotNull]
         IReplicaInfoBuilder SetUrlPath([CanBeNull] string path);
 
+        /// <summary>
+        /// <para>Sets configuration for HostnameProvider.</para>
+        /// <para>Default value: <c>null</c></para>
+        /// <para>Should not be called in conjunction with <see cref="SetUrl"/>.</para>
+        /// </summary>
+        IReplicaInfoBuilder SetupHostnameProvider([CanBeNull] Func<bool, string> hostNameProvider);
+
         /// <summary>
         /// <para>Sets build commit hash.</para>
         /// <para>By default, it will be parsed from <c>AssemblyTitle</c> attribute of entry assembly.</para>
@@ -103,7 +110,7 @@ public interface IReplicaInfoBuilder
         /// </summary>
         [NotNull]
         IReplicaInfoBuilder SetProperty([NotNull] string key, [CanBeNull] string value);
-        
+
         /// <summary>
         /// Sets a custom beacon <paramref name="tags"/>, which can be overwritten only by restarting the beacon.
         /// </summary>

Vostok.ServiceDiscovery/PublicAPI.Unshipped.txt

@@ -0,0 +1 @@
+Vostok.ServiceDiscovery.IReplicaInfoBuilder.SetupHostnameProvider(System.Func<bool, string> hostNameProvider) -> Vostok.ServiceDiscovery.IReplicaInfoBuilder

Vostok.ServiceDiscovery/ReplicaInfoBuilder.cs

@@ -34,11 +34,13 @@ internal class ReplicaInfoBuilder : IReplicaInfoBuilder
         private List<string> dependencies;
         private TagCollection tags;
 
+        private Func<bool, string> hostNameProvider;
+
         private ReplicaInfoBuilder(bool useFQDN)
         {
             environment = "default";
             application = EnvironmentInfo.Application;
-            host = useFQDN ? EnvironmentInfo.FQDN : EnvironmentInfo.Host;
+            host = useFQDN ? hostNameProvider?.Invoke(useFQDN) ?? EnvironmentInfo.FQDN : EnvironmentInfo.Host;
             processName = EnvironmentInfo.ProcessName;
             processId = EnvironmentInfo.ProcessId;
             baseDirectory = EnvironmentInfo.BaseDirectory;
@@ -57,7 +59,7 @@ public static ServiceBeaconInfo Build(ReplicaInfoSetup setup, bool useFQDN)
 
         public ServiceBeaconInfo Build()
         {
-            url = url ?? BuildUrl();
+            url ??= BuildUrl();
 
             if (replica == null)
                 replica = url?.ToString() ?? $"{host}({EnvironmentInfo.ProcessId})";
@@ -166,6 +168,12 @@ public IReplicaInfoBuilder SetUrlPath(string path)
             return this;
         }
 
+        public IReplicaInfoBuilder SetupHostnameProvider(Func<bool, string> hostNameProvider)
+        {
+            this.hostNameProvider = hostNameProvider;
+            return this;
+        }
+
         public IReplicaInfoBuilder SetCommitHash(string commitHash)
         {
             this.commitHash = commitHash;
@@ -195,7 +203,7 @@ public IReplicaInfoBuilder SetProperty(string key, string value)
             properties[key ?? throw new ArgumentNullException(nameof(key))] = value;
             return this;
         }
-        
+
         public IReplicaInfoBuilder SetTags(TagCollection tags)
         {
             this.tags = tags ?? new TagCollection();