nats-io#636 - JetStream Batch Get Client support

* Added throw exception

Author: Ivandemidov00

src/NATS.Client.JetStream/NatsJSStream.cs

@@ -1,5 +1,5 @@
+using System.Runtime.CompilerServices;
 using NATS.Client.Core;
-using NATS.Client.JetStream.Internal;
 using NATS.Client.JetStream.Models;
 
 namespace NATS.Client.JetStream;
@@ -202,17 +202,27 @@ public ValueTask<StreamMsgGetResponse> GetAsync(StreamMsgGetRequest request, Can
             request: request,
             cancellationToken);
 
-    private IAsyncEnumerable<NatsMsg<T>> GetBatchDirectInternalAsync<T>(StreamMsgBatchGetRequest request, INatsDeserialize<T>? serializer = default, CancellationToken cancellationToken = default)
+    private async IAsyncEnumerable<NatsMsg<T>> GetBatchDirectInternalAsync<T>(StreamMsgBatchGetRequest request, INatsDeserialize<T>? serializer = default, [EnumeratorCancellation] CancellationToken cancellationToken = default)
     {
         ValidateStream();
 
-        return _context.Connection.RequestManyAsync<StreamMsgBatchGetRequest, T>(
+        var requestManyAsync = _context.Connection.RequestManyAsync(
             subject: $"{_context.Opts.Prefix}.DIRECT.GET.{_name}",
             data: request,
             requestSerializer: NatsJSJsonSerializer<StreamMsgBatchGetRequest>.Default,
             replySerializer: serializer,
-            replyOpts: new NatsSubOpts() { StopOnEmptyMsg = true, ThrowIfNoResponders = true },
+            replyOpts: new NatsSubOpts { StopOnEmptyMsg = true, ThrowIfNoResponders = true },
             cancellationToken: cancellationToken);
+
+        await foreach (var msg in requestManyAsync.ConfigureAwait(false))
+        {
+            if (msg.Error is { } error)
+            {
+                throw error;
+            }
+
+            yield return msg;
+        }
     }
 
     private void ThrowIfDeleted()

tests/NATS.Client.JetStream.Tests/DirectGetTest.cs

@@ -9,7 +9,7 @@ public class DirectGetTest
     public async Task Direct_get_when_stream_disable()
     {
         await using var server = NatsServer.StartJS();
-        var nats = server.CreateClientConnection();
+        await using var nats = server.CreateClientConnection();
         var js = new NatsJSContext(nats);
         var cts = new CancellationTokenSource();
         var cancellationToken = cts.Token;
@@ -33,7 +33,7 @@ public async Task Direct_get_when_stream_enable()
     {
         var testDataList = new List<TestData?>();
         await using var server = NatsServer.StartJS();
-        var nats = server.CreateClientConnection();
+        await using var nats = server.CreateClientConnection();
         var js = new NatsJSContext(nats);
         var cts = new CancellationTokenSource(TimeSpan.FromSeconds(100));
         var cancellationToken = cts.Token;
@@ -57,11 +57,11 @@ public async Task Direct_get_by_multi_last()
     {
         var testDataList = new List<TestData?>();
         await using var server = NatsServer.StartJS();
-        var nats = server.CreateClientConnection();
+        await using var nats = server.CreateClientConnection();
         var js = new NatsJSContext(nats);
         var cts = new CancellationTokenSource(TimeSpan.FromSeconds(100));
         var cancellationToken = cts.Token;
-        var streamConfig = new StreamConfig("multiLast", new[] { "multiLast.*" }) { AllowDirect = true };
+        var streamConfig = new StreamConfig("multiLast", ["multiLast.*"]) { AllowDirect = true };
 
         var stream = await js.CreateStreamAsync(streamConfig, cancellationToken);