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Akka.Event: add log filtering system to prevent Akka.NET logs from be…
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…ing emitted in first place (#7179)

* create `LogFilter` infrastructure

* Create evaluator from setup

close #7097

* added sanity checks for `Regex`-based rules

* integrated `LogFilterSetup` into `Settings` and `StandardOutLogger`

* simplifying

* added accurate end2end unit test

* added API approvals

* removed unnecessary API from `LogFilterBase`

* small perf optimization for default cases

* fixed bug with blended filter types

* added API approvals

* fixed race condition with tests

* updated APIs to be more expansive

* added docs

* fixed reference to samples

* fixed markdown linting rule

---------

Co-authored-by: Gregorius Soedharmo <arkatufus@yahoo.com>
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@Aaronontheweb @Arkatufus
Aaronontheweb and Arkatufus committed May 22, 2024
1 parent 3f0be58 commit d1ed226
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39 changes: 39 additions & 0 deletions docs/articles/utilities/logging.md
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Expand Up @@ -194,3 +194,42 @@ In your log, expect to see a line such as:
`[DEBUG]... received handled message hello from akka://test/deadLetters`

This logging can be toggled by configuring `akka.actor.debug.receive`.

## Filtering Log Messages

Since v1.5.21, Akka.NET supports for filtering log messages based on the `LogSource` or the content of a log message.

The goal of this feature is to allow users to run Akka.NET at more verbose logging settings (i.e. `LogLevel.Debug`) while not getting completely flooded with unhelpful noise from the Akka.NET logging system. You can use the [`LogFilterBuilder`](xref:Akka.Event.LogFilterBuilder) to exclude messages don't need while still keeping ones that you do.

### Configuring Log Filtering

[!code-csharp[Create LoggerSetup](../../../src/core/Akka.Tests/Loggers/LogFilterEvaluatorSpecs.cs?name=CreateLoggerSetup)]

We create a [`LogFilterBuilder`](xref:Akka.Event.LogFilterBuilder) prior to starting the `ActorSystem` and provide it with rules for which logs _should be excluded_ from any of Akka.NET's logged output - this uses the [`ActorSystemSetup`](xref:Akka.Actor.Setup.ActorSystemSetup) class functionality that Akka.NET supports for programmatic `ActorSystem` configuration:

[!code-csharp[Create ActorSystemSetup](../../../src/core/Akka.Tests/Loggers/LogFilterEvaluatorSpecs.cs?name=ActorSystemSetup)]

From there, we can create our `ActorSystem` with these rules enabled:

```csharp
ActorSystemSetup completeSetup = CustomLoggerSetup();

// start the ActorSystem with the LogFilterBuilder rules enabled
ActorSystem mySystem = ActorSystem.Create("MySys", completeSetup);
```

### Log Filtering Rules

There are two built-in types of log filtering rules:

* `ExcludeSource___` - filters logs based on the `LogSource`; this type of filtering is _very_ resource efficient because it doesn't require the log message to be expanded in order for filtering to work.
* `ExcludeMessage___` - filters logs based on the content of the message. More resource-intensive as it does require log messages to be fully expanded prior to filtering.

> [!NOTE]
> For an Akka.NET log to be excluded from the output logs, only one filter rule has to return a `LogFilterDecision.Drop`.
However, if that's not sufficient for your purposes we also support defining custom rules via the `LogFilterBase` class:

[!code-csharp[LogFilterBase](../../../src/core/Akka/Event/LogFilter.cs?name=LogFilterBase)]

You can filter log messages based on any of the accessibly properties, and for performance reasons any `LogFilterBase` that looks at `LogFilterType.Content` will be passed in the fully expanded log message as a `string?` via the optional `expandedMessage` property. This is done in order to avoid allocating the log message every time for each possible rule that might be evaluated.
70 changes: 70 additions & 0 deletions src/core/Akka.API.Tests/verify/CoreAPISpec.ApproveCore.DotNet.verified.txt
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Expand Up @@ -1725,6 +1725,7 @@ namespace Akka.Actor
public int LogDeadLetters { get; }
public bool LogDeadLettersDuringShutdown { get; }
public System.TimeSpan LogDeadLettersSuspendDuration { get; }
public Akka.Event.LogFilterEvaluator LogFilter { get; }
public Akka.Event.ILogMessageFormatter LogFormatter { get; }
public string LogLevel { get; }
public bool LogSerializerOverrideOnStart { get; }
Expand Down Expand Up @@ -3373,6 +3374,13 @@ namespace Akka.Event
public static bool Subscribe<TChannel>(this Akka.Event.EventStream eventStream, Akka.Actor.IActorRef subscriber) { }
public static bool Unsubscribe<TChannel>(this Akka.Event.EventStream eventStream, Akka.Actor.IActorRef subscriber) { }
}
[System.Runtime.CompilerServices.NullableAttribute(0)]
public sealed class ExactMatchLogSourceFilter : Akka.Event.LogFilterBase
{
public ExactMatchLogSourceFilter(string source, System.StringComparison comparison = 5) { }
public override Akka.Event.LogFilterType FilterType { get; }
public override Akka.Event.LogFilterDecision ShouldKeepMessage(Akka.Event.LogEvent content, [System.Runtime.CompilerServices.NullableAttribute(2)] string expandedMessage = null) { }
}
public interface IDeadLetterSuppression { }
public interface ILogMessageFormatter
{
Expand Down Expand Up @@ -3414,6 +3422,53 @@ namespace Akka.Event
public abstract Akka.Event.LogLevel LogLevel();
public override string ToString() { }
}
public abstract class LogFilterBase : Akka.Actor.INoSerializationVerificationNeeded, Akka.Event.IDeadLetterSuppression
{
protected LogFilterBase() { }
public abstract Akka.Event.LogFilterType FilterType { get; }
public abstract Akka.Event.LogFilterDecision ShouldKeepMessage(Akka.Event.LogEvent content, [System.Runtime.CompilerServices.NullableAttribute(2)] string expandedMessage = null);
}
[System.Runtime.CompilerServices.NullableAttribute(0)]
public sealed class LogFilterBuilder
{
public LogFilterBuilder() { }
public Akka.Event.LogFilterBuilder Add(Akka.Event.LogFilterBase filter) { }
public Akka.Event.LogFilterBuilder AddRange(System.Collections.Generic.IEnumerable<Akka.Event.LogFilterBase> filters) { }
public Akka.Event.LogFilterSetup Build() { }
public Akka.Event.LogFilterBuilder ExcludeMessageContaining(string messagePart) { }
public Akka.Event.LogFilterBuilder ExcludeMessageRegex(System.Text.RegularExpressions.Regex regex) { }
public Akka.Event.LogFilterBuilder ExcludeSourceContaining(string sourcePart) { }
public Akka.Event.LogFilterBuilder ExcludeSourceEndingWith(string sourceEnd) { }
public Akka.Event.LogFilterBuilder ExcludeSourceExactly(string source, System.StringComparison comparison = 5) { }
public Akka.Event.LogFilterBuilder ExcludeSourceRegex(System.Text.RegularExpressions.Regex regex) { }
public Akka.Event.LogFilterBuilder ExcludeSourceStartingWith(string sourceStart) { }
}
public enum LogFilterDecision
{
Keep = 0,
Drop = 1,
NoDecision = 2,
}
[System.Runtime.CompilerServices.NullableAttribute(0)]
public class LogFilterEvaluator
{
public static readonly Akka.Event.LogFilterEvaluator NoFilters;
public LogFilterEvaluator(Akka.Event.LogFilterBase[] filters) { }
public bool EvaluatesLogSourcesOnly { get; }
public virtual bool ShouldTryKeepMessage(Akka.Event.LogEvent evt, out string expandedLogMessage) { }
}
[System.Runtime.CompilerServices.NullableAttribute(0)]
public sealed class LogFilterSetup : Akka.Actor.Setup.Setup
{
public LogFilterSetup(Akka.Event.LogFilterBase[] filters) { }
public Akka.Event.LogFilterBase[] Filters { get; }
public Akka.Event.LogFilterEvaluator CreateEvaluator() { }
}
public enum LogFilterType
{
Source = 0,
Content = 1,
}
public enum LogLevel
{
DebugLevel = 0,
Expand Down Expand Up @@ -3571,6 +3626,7 @@ namespace Akka.Event
public abstract class MinimalLogger : Akka.Actor.MinimalActorRef
{
protected MinimalLogger() { }
public Akka.Event.LogFilterEvaluator Filter { get; }
public virtual Akka.Actor.ActorPath Path { get; }
public virtual Akka.Actor.IActorRefProvider Provider { get; }
protected abstract void Log(object message);
Expand All @@ -3588,6 +3644,20 @@ namespace Akka.Event
public void Log(Akka.Event.LogLevel logLevel, System.Exception cause, string format) { }
public void Log(Akka.Event.LogLevel logLevel, System.Exception cause, Akka.Event.LogMessage message) { }
}
[System.Runtime.CompilerServices.NullableAttribute(0)]
public sealed class RegexLogMessageFilter : Akka.Event.LogFilterBase
{
public RegexLogMessageFilter(System.Text.RegularExpressions.Regex messageRegex) { }
public override Akka.Event.LogFilterType FilterType { get; }
public override Akka.Event.LogFilterDecision ShouldKeepMessage(Akka.Event.LogEvent content, [System.Runtime.CompilerServices.NullableAttribute(2)] string expandedMessage = null) { }
}
[System.Runtime.CompilerServices.NullableAttribute(0)]
public sealed class RegexLogSourceFilter : Akka.Event.LogFilterBase
{
public RegexLogSourceFilter(System.Text.RegularExpressions.Regex sourceRegex) { }
public override Akka.Event.LogFilterType FilterType { get; }
public override Akka.Event.LogFilterDecision ShouldKeepMessage(Akka.Event.LogEvent content, [System.Runtime.CompilerServices.NullableAttribute(2)] string expandedMessage = null) { }
}
public class StandardOutLogger : Akka.Event.MinimalLogger
{
public StandardOutLogger() { }
Expand Down
70 changes: 70 additions & 0 deletions src/core/Akka.API.Tests/verify/CoreAPISpec.ApproveCore.Net.verified.txt
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Expand Up @@ -1723,6 +1723,7 @@ namespace Akka.Actor
public int LogDeadLetters { get; }
public bool LogDeadLettersDuringShutdown { get; }
public System.TimeSpan LogDeadLettersSuspendDuration { get; }
public Akka.Event.LogFilterEvaluator LogFilter { get; }
public Akka.Event.ILogMessageFormatter LogFormatter { get; }
public string LogLevel { get; }
public bool LogSerializerOverrideOnStart { get; }
Expand Down Expand Up @@ -3365,6 +3366,13 @@ namespace Akka.Event
public static bool Subscribe<TChannel>(this Akka.Event.EventStream eventStream, Akka.Actor.IActorRef subscriber) { }
public static bool Unsubscribe<TChannel>(this Akka.Event.EventStream eventStream, Akka.Actor.IActorRef subscriber) { }
}
[System.Runtime.CompilerServices.NullableAttribute(0)]
public sealed class ExactMatchLogSourceFilter : Akka.Event.LogFilterBase
{
public ExactMatchLogSourceFilter(string source, System.StringComparison comparison = 5) { }
public override Akka.Event.LogFilterType FilterType { get; }
public override Akka.Event.LogFilterDecision ShouldKeepMessage(Akka.Event.LogEvent content, [System.Runtime.CompilerServices.NullableAttribute(2)] string expandedMessage = null) { }
}
public interface IDeadLetterSuppression { }
public interface ILogMessageFormatter
{
Expand Down Expand Up @@ -3406,6 +3414,53 @@ namespace Akka.Event
public abstract Akka.Event.LogLevel LogLevel();
public override string ToString() { }
}
public abstract class LogFilterBase : Akka.Actor.INoSerializationVerificationNeeded, Akka.Event.IDeadLetterSuppression
{
protected LogFilterBase() { }
public abstract Akka.Event.LogFilterType FilterType { get; }
public abstract Akka.Event.LogFilterDecision ShouldKeepMessage(Akka.Event.LogEvent content, [System.Runtime.CompilerServices.NullableAttribute(2)] string expandedMessage = null);
}
[System.Runtime.CompilerServices.NullableAttribute(0)]
public sealed class LogFilterBuilder
{
public LogFilterBuilder() { }
public Akka.Event.LogFilterBuilder Add(Akka.Event.LogFilterBase filter) { }
public Akka.Event.LogFilterBuilder AddRange(System.Collections.Generic.IEnumerable<Akka.Event.LogFilterBase> filters) { }
public Akka.Event.LogFilterSetup Build() { }
public Akka.Event.LogFilterBuilder ExcludeMessageContaining(string messagePart) { }
public Akka.Event.LogFilterBuilder ExcludeMessageRegex(System.Text.RegularExpressions.Regex regex) { }
public Akka.Event.LogFilterBuilder ExcludeSourceContaining(string sourcePart) { }
public Akka.Event.LogFilterBuilder ExcludeSourceEndingWith(string sourceEnd) { }
public Akka.Event.LogFilterBuilder ExcludeSourceExactly(string source, System.StringComparison comparison = 5) { }
public Akka.Event.LogFilterBuilder ExcludeSourceRegex(System.Text.RegularExpressions.Regex regex) { }
public Akka.Event.LogFilterBuilder ExcludeSourceStartingWith(string sourceStart) { }
}
public enum LogFilterDecision
{
Keep = 0,
Drop = 1,
NoDecision = 2,
}
[System.Runtime.CompilerServices.NullableAttribute(0)]
public class LogFilterEvaluator
{
public static readonly Akka.Event.LogFilterEvaluator NoFilters;
public LogFilterEvaluator(Akka.Event.LogFilterBase[] filters) { }
public bool EvaluatesLogSourcesOnly { get; }
public virtual bool ShouldTryKeepMessage(Akka.Event.LogEvent evt, out string expandedLogMessage) { }
}
[System.Runtime.CompilerServices.NullableAttribute(0)]
public sealed class LogFilterSetup : Akka.Actor.Setup.Setup
{
public LogFilterSetup(Akka.Event.LogFilterBase[] filters) { }
public Akka.Event.LogFilterBase[] Filters { get; }
public Akka.Event.LogFilterEvaluator CreateEvaluator() { }
}
public enum LogFilterType
{
Source = 0,
Content = 1,
}
public enum LogLevel
{
DebugLevel = 0,
Expand Down Expand Up @@ -3561,6 +3616,7 @@ namespace Akka.Event
public abstract class MinimalLogger : Akka.Actor.MinimalActorRef
{
protected MinimalLogger() { }
public Akka.Event.LogFilterEvaluator Filter { get; }
public virtual Akka.Actor.ActorPath Path { get; }
public virtual Akka.Actor.IActorRefProvider Provider { get; }
protected abstract void Log(object message);
Expand All @@ -3578,6 +3634,20 @@ namespace Akka.Event
public void Log(Akka.Event.LogLevel logLevel, System.Exception cause, string format) { }
public void Log(Akka.Event.LogLevel logLevel, System.Exception cause, Akka.Event.LogMessage message) { }
}
[System.Runtime.CompilerServices.NullableAttribute(0)]
public sealed class RegexLogMessageFilter : Akka.Event.LogFilterBase
{
public RegexLogMessageFilter(System.Text.RegularExpressions.Regex messageRegex) { }
public override Akka.Event.LogFilterType FilterType { get; }
public override Akka.Event.LogFilterDecision ShouldKeepMessage(Akka.Event.LogEvent content, [System.Runtime.CompilerServices.NullableAttribute(2)] string expandedMessage = null) { }
}
[System.Runtime.CompilerServices.NullableAttribute(0)]
public sealed class RegexLogSourceFilter : Akka.Event.LogFilterBase
{
public RegexLogSourceFilter(System.Text.RegularExpressions.Regex sourceRegex) { }
public override Akka.Event.LogFilterType FilterType { get; }
public override Akka.Event.LogFilterDecision ShouldKeepMessage(Akka.Event.LogEvent content, [System.Runtime.CompilerServices.NullableAttribute(2)] string expandedMessage = null) { }
}
public class StandardOutLogger : Akka.Event.MinimalLogger
{
public StandardOutLogger() { }
Expand Down

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