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Async Methods swallow exceptions #961

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Async Methods swallow exceptions #961

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71c6fbc
Enhance exception handling and logging across the app
vb2ae Jan 1, 2025
a96c669
fix the build
vb2ae Jan 1, 2025
d1e6c0f
Fix some of the errors
vb2ae Jan 5, 2025
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7 changes: 7 additions & 0 deletions src/Caliburn.Micro.Core/ResultCompletionEventArgs.cs
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In your comment you said that there was a private field added to this class but I only see the added constructor?

Original file line number Diff line number Diff line change
Expand Up @@ -18,5 +18,12 @@ public class ResultCompletionEventArgs : EventArgs
/// </summary>
/// <value><c>true</c> if cancelled; otherwise, <c>false</c>.</value>
public bool WasCancelled;

/// <summary>
/// Initializes a new instance of the <see cref="ResultCompletionEventArgs"/> class.
/// </summary>
public ResultCompletionEventArgs()
{
}
}
}
68 changes: 58 additions & 10 deletions src/Caliburn.Micro.Core/Screen.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -103,20 +103,33 @@

if (!IsInitialized)
{
try
{
Log.Info("Initializing {0}.", this);
#pragma warning disable CS0618 // Type or member is obsolete
await OnInitializeAsync(cancellationToken);
await OnInitializeAsync(cancellationToken);
Dismissed Show dismissed Hide dismissed
#pragma warning restore CS0618 // Type or member is obsolete
IsInitialized = initialized = true;
await OnInitializedAsync(cancellationToken);
IsInitialized = initialized = true;
await OnInitializedAsync(cancellationToken);
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This is not something that was done here in this PR, but why was the name changed from OnInitializeAsync to OnInitializedAsync? This method is called when initializing so the initializing happens in the OnInitializeAsync thus the name OnInitializeAsync makes more sense then OnInitializedAsync since OnInitializedAsync implies that the initialization is already completed.

}
catch (Exception ex)
{
Log.Error(ex);
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Missing call to OnInitializeAsyncException/OnInitializedAsyncException

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I agree, either all the methods should log the exception or there should be a OnException method that the user can hook into.

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fixed

}
Fixed Show fixed Hide fixed
}

Log.Info("Activating {0}.", this);
try
{
Log.Info("Activating {0}.", this);
#pragma warning disable CS0618 // Type or member is obsolete
await OnActivateAsync(cancellationToken);
await OnActivateAsync(cancellationToken);
Dismissed Show dismissed Hide dismissed
#pragma warning restore CS0618 // Type or member is obsolete
IsActive = true;
await OnActivatedAsync(cancellationToken);

IsActive = true;
await OnActivatedAsync(cancellationToken);
}
catch (Exception ex)
{
OnActivatedAsyncException(ex);
}
Fixed Show fixed Hide fixed
await (Activated?.InvokeAllAsync(this, new ActivationEventArgs
{
WasInitialized = initialized
Expand All @@ -134,7 +147,15 @@
});

Log.Info("Deactivating {0}.", this);
await OnDeactivateAsync(close, cancellationToken);
try
{
await OnDeactivateAsync(close, cancellationToken);
}
catch (Exception ex)
{
OnDeactivateAsyncException(ex);
}
Fixed Show fixed Hide fixed

IsActive = false;

await (Deactivated?.InvokeAllAsync(this, new DeactivationEventArgs
Expand Down Expand Up @@ -206,6 +227,15 @@
}


/// <summary>
/// Called when exception called in OnActivatedAsync.
/// </summary>
protected virtual void OnActivatedAsyncException(Exception thrownException)
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This gets called when OnActivateAsync or OnActivatedAsync throws an exception but the name OnActivatedAsyncException suggests it is related to the OnActivatedAsync method. Maybe we should split this into two methods? Like OnActivateAsyncException and OnActivatedAsyncException? Any other ideas?

PS: Same for OnInitializedAsyncException

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I think the rename from OnActivateAsync to OnActivatedAsync should be reverted, since that function is called when the framework wants to activate the screen and not when it is already activated.

{
Log.Info("Activated Async Exception");
Log.Error(thrownException);
}

/// <summary>
/// Called when view has been activated.
/// </summary>
Expand All @@ -226,5 +256,23 @@
Log.Info("Task deactivate");
return Task.FromResult(true);
}

/// <summary>
/// Called when exception called in OnDectivateAsync.
/// </summary>
protected virtual void OnDeactivateAsyncException(Exception thrownException)
{
Log.Info("Deactivate Async Exception");
Log.Error(thrownException);
}

/// <summary>
/// Called when exception called in OnInitializedAsync.
/// </summary>
protected virtual void OnInitializedAsyncException(Exception thrownException)
{
Log.Info("Initialized Async Exception");
Log.Error(thrownException);
}
}
}
13 changes: 11 additions & 2 deletions src/Caliburn.Micro.Platform/Platforms/Android/CaliburnApplication.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,7 @@ public class CaliburnApplication : Application
public CaliburnApplication(IntPtr javaReference, JniHandleOwnership transfer)
: base(javaReference, transfer)
{

}

/// <summary>
Expand All @@ -41,7 +41,7 @@ protected virtual void StartDesignTime()

/// <summary>
/// Called by the bootstrapper's constructor at runtime to start the framework.
/// </summary>B
/// </summary>
protected virtual void StartRuntime()
{
AssemblySourceCache.Install();
Expand Down Expand Up @@ -131,5 +131,14 @@ protected virtual IEnumerable<object> GetAllInstances(Type service)
protected virtual void BuildUp(object instance)
{
}

/// <summary>
/// Handles exceptions that occur during coroutine execution.
/// </summary>
/// <param name="sender">The sender of the event.</param>
/// <param name="e">The event arguments containing exception details.</param>
protected virtual void CoroutineException(object sender, ResultCompletionEventArgs e)
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Will this ever be called? Isn't it missing the following in Initialize method?

            Coroutine.Completed += (s, e) =>
            {
                if (e.Error != null)
                {
                    CoroutineException(s, e);
                }
            };

If yes then please also check:

{
}
}
}
24 changes: 18 additions & 6 deletions src/Caliburn.Micro.Platform/Platforms/Maui/Android/CaliburnApplication.cs
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Original file line number Diff line number Diff line change
@@ -1,10 +1,7 @@
using System;
using System.Collections.Generic;
using System.Reflection;
using Android.App;
using Android.Runtime;
using Microsoft.Maui;
using Microsoft.Maui.Hosting;

namespace Caliburn.Micro.Maui
{
Expand All @@ -23,7 +20,7 @@ public abstract class CaliburnApplication : Microsoft.Maui.MauiApplication
public CaliburnApplication(IntPtr javaReference, JniHandleOwnership transfer)
: base(javaReference, transfer)
{

}

/// <summary>
Expand All @@ -39,7 +36,7 @@ protected virtual void StartDesignTime()

/// <summary>
/// Called by the bootstrapper's constructor at runtime to start the framework.
/// </summary>B
/// </summary>
protected virtual void StartRuntime()
{
AssemblySourceCache.Install();
Expand Down Expand Up @@ -79,6 +76,14 @@ protected void Initialize()
{
StartRuntime();
}

Coroutine.Completed += (s, e) =>
{
if (e.Error != null)
{
CoroutineException(s, e);
}
};
}

/// <summary>
Expand All @@ -97,6 +102,13 @@ protected virtual IEnumerable<Assembly> SelectAssemblies()
return new[] { GetType().GetTypeInfo().Assembly };
}


/// <summary>
/// Handles exceptions that occur during coroutine execution.
/// </summary>
/// <param name="sender">The sender of the event.</param>
/// <param name="e">The event arguments containing the exception details.</param>
protected virtual void CoroutineException(object sender, ResultCompletionEventArgs e)
{
}
}
}
26 changes: 21 additions & 5 deletions src/Caliburn.Micro.Platform/Platforms/Maui/FormsApplication.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,6 @@
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using Microsoft.Maui.Controls;

Expand All @@ -19,8 +18,10 @@ public abstract class MauiApplication : Application
/// <summary>
/// Start the framework.
/// </summary>
protected void Initialize() {
if (isInitialized) {
protected void Initialize()
{
if (isInitialized)
{
return;
}

Expand All @@ -30,10 +31,11 @@ protected void Initialize() {

var baseExtractTypes = AssemblySourceCache.ExtractTypes;

AssemblySourceCache.ExtractTypes = assembly => {
AssemblySourceCache.ExtractTypes = assembly =>
{
var baseTypes = baseExtractTypes(assembly);
var elementTypes = assembly.ExportedTypes
.Where(t => typeof (Element).GetTypeInfo().IsAssignableFrom(t.GetTypeInfo()));
.Where(t => typeof(Element).GetTypeInfo().IsAssignableFrom(t.GetTypeInfo()));

return baseTypes.Union(elementTypes);
};
Expand All @@ -44,6 +46,13 @@ protected void Initialize() {
IoC.BuildUp = BuildUp;

AssemblySource.Instance.Refresh();
Coroutine.Completed += (s, e) =>
{
if (e.Error != null)
{
CoroutineException(s, e);
}
};
}

/// <summary>
Expand Down Expand Up @@ -174,5 +183,12 @@ protected virtual IEnumerable<object> GetAllInstances(Type service)
protected virtual void BuildUp(object instance)
{
}

/// <summary>
/// Called by the bootstrapper's constructor at design time to start the framework.
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TODO: Fix comment within <summary>. Same for:

/// </summary>
protected virtual void CoroutineException(object sender, ResultCompletionEventArgs e)
{
}
}
}
7 changes: 7 additions & 0 deletions src/Caliburn.Micro.Platform/Platforms/Maui/Windows/CaliburnApplication.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -141,5 +141,12 @@ protected virtual void OnUnhandledException(object sender, Microsoft.UI.Xaml.Unh
{
}

/// <summary>
/// Called by the bootstrapper's constructor at design time to start the framework.
/// </summary>
protected virtual void CoroutineException(object sender, ResultCompletionEventArgs e)
{
}

}
}
19 changes: 15 additions & 4 deletions src/Caliburn.Micro.Platform/Platforms/Maui/iOS/CaliburnApplicationDelegate.cs
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Original file line number Diff line number Diff line change
@@ -1,8 +1,5 @@
using System;
using System.Collections.Generic;
using System.Reflection;
using Foundation;
using UIKit;
using Microsoft.Maui;

namespace Caliburn.Micro.Maui
Expand Down Expand Up @@ -86,6 +83,13 @@ protected void Initialize()
}
else
StartRuntime();
Coroutine.Completed += (s, e) =>
{
if (e.Error != null)
{
CoroutineException(s, e);
}
};
}

/// <summary>
Expand All @@ -101,7 +105,14 @@ protected virtual void Configure()
/// <returns>A list of assemblies to inspect.</returns>
protected virtual IEnumerable<Assembly> SelectAssemblies()
{
return new[] {GetType().GetTypeInfo().Assembly};
return new[] { GetType().GetTypeInfo().Assembly };
}

/// <summary>
/// Called by the bootstrapper's constructor at design time to start the framework.
/// </summary>
protected virtual void CoroutineException(object sender, ResultCompletionEventArgs e)
{
}

}
Expand Down
13 changes: 11 additions & 2 deletions src/Caliburn.Micro.Platform/Platforms/iOS/CaliburnApplicationDelegate.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -106,7 +106,7 @@ protected virtual void Configure()
/// <returns>A list of assemblies to inspect.</returns>
protected virtual IEnumerable<Assembly> SelectAssemblies()
{
return new[] {GetType().GetTypeInfo().Assembly};
return new[] { GetType().GetTypeInfo().Assembly };
}

/// <summary>
Expand All @@ -127,7 +127,7 @@ protected virtual object GetInstance(Type service, string key)
/// <returns>The located services.</returns>
protected virtual IEnumerable<object> GetAllInstances(Type service)
{
return new[] {Activator.CreateInstance(service)};
return new[] { Activator.CreateInstance(service) };
}

/// <summary>
Expand All @@ -137,5 +137,14 @@ protected virtual IEnumerable<object> GetAllInstances(Type service)
protected virtual void BuildUp(object instance)
{
}

/// <summary>
/// Handles exceptions that occur during coroutine execution.
/// </summary>
/// <param name="sender">The sender of the event.</param>
/// <param name="e">The event arguments containing exception details.</param>
protected virtual void CoroutineException(object sender, ResultCompletionEventArgs e)
{
}
}
}
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