Stopped blocking a thread while streams wait for their next line

app/MindWork AI Studio/Provider/BaseProvider.cs

@@ -1007,22 +1007,12 @@ public abstract class BaseProvider : IProvider, ISecretId
         try
         {
             //
-            // Read the stream, line by line:
+            // Read the stream, line by line, until it ends. We never ask the reader whether the
+            // stream ended: that would wait for the next data without any timeout, and it would
+            // hold a thread meanwhile. Reading the next line tells the same, see below.
             //
             while (true)
             {
-                try
-                {
-                    if(streamReader.EndOfStream)
-                        break;
-                }
-                catch (Exception e)
-                {
-                    await MessageBus.INSTANCE.SendError(new(Icons.Material.Filled.Stream, string.Format(TB("Tried to stream the LLM provider '{0}' answer. There were some problems with the stream. The message is: '{1}'"), this.InstanceName, e.Message)));
-                    this.logger.LogWarning(e, "Failed to read the end-of-stream state from {ProviderName} '{ProviderInstanceName}': {ErrorMessage}", providerName, this.InstanceName, e.Message);
-                    break;
-                }
-
                 // Check if the token is canceled:
                 if (token.IsCancellationRequested)
                 {
@@ -1058,13 +1048,14 @@ public abstract class BaseProvider : IProvider, ISecretId
                     break;
                 }
 
+                // The stream ended:
                 if (line is null)
                     break;
 
                 // Skip empty lines:
                 if (string.IsNullOrWhiteSpace(line))
                     continue;
-                
+
                 if (this.TryCreateProviderRequestExceptionFromStreamLine(providerName, line, out var providerRequestException))
                     throw providerRequestException;
 

app/MindWork AI Studio/Tools/Services/RustService.Events.cs

@@ -27,12 +27,9 @@ public partial class RustService
                     // Read events line by line:
                     using var reader = new StreamReader(stream);
                     
-                    // Read until the end of the stream or cancellation:
-                    while(!reader.EndOfStream && !stopToken.IsCancellationRequested)
+                    // Read the next line of JSON until the end of the stream or cancellation:
+                    while(!stopToken.IsCancellationRequested && await reader.ReadLineAsync(stopToken) is { } line)
                     {
-                        // Read the next line of JSON from the stream:
-                        var line = await reader.ReadLineAsync(stopToken);
-                        
                         // Skip empty lines:
                         if (string.IsNullOrWhiteSpace(line))
                             continue;

app/MindWork AI Studio/Tools/Services/RustService.Retrieval.cs

@@ -352,9 +352,8 @@ public sealed partial class RustService
             await using var stream = await response.Content.ReadAsStreamAsync(token);
             using var reader = new StreamReader(stream);
 
-            while (!reader.EndOfStream && !token.IsCancellationRequested)
+            while (!token.IsCancellationRequested && await reader.ReadLineAsync(token) is { } line)
             {
-                var line = await reader.ReadLineAsync(token);
                 if (string.IsNullOrWhiteSpace(line))
                     continue;