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Start Azure SDK log forwarder in AzMon OTel distro (#42374)
* Start Azure SDK log forwarder in AzMon OTel distro
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| // Copyright (c) Microsoft Corporation. All rights reserved. | ||
| // Licensed under the MIT License. | ||
|
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| using System; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
| using System.Diagnostics.Tracing; | ||
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| #nullable enable | ||
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| namespace Azure.Core.Shared | ||
| { | ||
| /// <summary> | ||
| /// Wraps <see cref="EventWrittenEventArgs"/> into <see cref="IReadOnlyList{T}"/> simplifying iterating over | ||
| /// payload properties and providing them to logging libraries in a structured way. | ||
| /// </summary> | ||
| internal readonly struct EventSourceEvent : IReadOnlyList<KeyValuePair<string, object?>> | ||
| { | ||
| /// <summary> | ||
| /// Gets underlying EventSource event. | ||
| /// </summary> | ||
| public EventWrittenEventArgs EventData { get; } | ||
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| public EventSourceEvent(EventWrittenEventArgs eventData) | ||
| { | ||
| EventData = eventData; | ||
| } | ||
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| /// <inheritdoc /> | ||
| public IEnumerator<KeyValuePair<string, object?>> GetEnumerator() | ||
| { | ||
| if (EventData.PayloadNames == null || EventData.Payload == null) | ||
| { | ||
| yield break; | ||
| } | ||
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| for (int i = 0; i < Count; i++) | ||
| { | ||
| yield return new KeyValuePair<string, object?>(EventData.PayloadNames[i], EventData.Payload[i]); | ||
| } | ||
| } | ||
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| IEnumerator IEnumerable.GetEnumerator() | ||
| { | ||
| return GetEnumerator(); | ||
| } | ||
|
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| /// <summary> | ||
| /// Returns the count of payload properties in the Eventsource event. | ||
| /// </summary> | ||
| public int Count => EventData.PayloadNames?.Count ?? 0; | ||
|
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| /// <summary> | ||
| /// Formats EventSource event as a string including all payload properties. | ||
| /// </summary> | ||
| public string Format() | ||
| { | ||
| return EventSourceEventFormatting.Format(EventData); | ||
| } | ||
|
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| /// <inheritdoc /> | ||
| public KeyValuePair<string, object?> this[int index] | ||
| { | ||
| get | ||
| { | ||
| if (EventData.PayloadNames == null || EventData.Payload == null || index >= EventData.PayloadNames.Count || index < 0) | ||
| { | ||
| throw new IndexOutOfRangeException("Index was out of range."); | ||
| } | ||
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| return new KeyValuePair<string, object?>(EventData.PayloadNames[index], EventData.Payload[index]); | ||
| } | ||
| } | ||
| } | ||
| } |
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85 changes: 85 additions & 0 deletions
85
...tor.OpenTelemetry.AspNetCore/src/Internals/AzureSdkCompat/AzureEventSourceLogForwarder.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| // Copyright (c) Microsoft Corporation. All rights reserved. | ||
| // Licensed under the MIT License. | ||
|
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| using System.Collections.Concurrent; | ||
| using System.Diagnostics.Tracing; | ||
| using Azure.Core.Diagnostics; | ||
| using Azure.Core.Shared; | ||
| using Microsoft.Extensions.Hosting; | ||
| using Microsoft.Extensions.Logging; | ||
|
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| namespace Azure.Monitor.OpenTelemetry.AspNetCore.Internals.AzureSdkCompat | ||
| { | ||
| internal sealed class AzureEventSourceLogForwarder : IHostedService, IDisposable | ||
| { | ||
| internal static readonly AzureEventSourceLogForwarder Noop = new AzureEventSourceLogForwarder(null); | ||
| private readonly ILoggerFactory _loggerFactory; | ||
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| private readonly ConcurrentDictionary<string, ILogger> _loggers = new ConcurrentDictionary<string, ILogger>(); | ||
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| private readonly Func<EventSourceEvent, Exception, string> _formatMessage = FormatMessage; | ||
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| private AzureEventSourceListener _listener; | ||
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| public AzureEventSourceLogForwarder(ILoggerFactory loggerFactory) | ||
| { | ||
| _loggerFactory = loggerFactory; | ||
| } | ||
|
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| private void LogEvent(EventWrittenEventArgs eventData) | ||
| { | ||
| var logger = _loggers.GetOrAdd(eventData.EventSource.Name, name => _loggerFactory!.CreateLogger(ToLoggerName(name))); | ||
| logger.Log(MapLevel(eventData.Level), new EventId(eventData.EventId, eventData.EventName), new EventSourceEvent(eventData), null, _formatMessage); | ||
| } | ||
|
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| private static string ToLoggerName(string name) | ||
| { | ||
| return name.Replace('-', '.'); | ||
| } | ||
|
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| private static LogLevel MapLevel(EventLevel level) | ||
| { | ||
| switch (level) | ||
| { | ||
| case EventLevel.Critical: | ||
| return LogLevel.Critical; | ||
| case EventLevel.Error: | ||
| return LogLevel.Error; | ||
| case EventLevel.Informational: | ||
| return LogLevel.Information; | ||
| case EventLevel.Verbose: | ||
| return LogLevel.Debug; | ||
| case EventLevel.Warning: | ||
| return LogLevel.Warning; | ||
| case EventLevel.LogAlways: | ||
| return LogLevel.Information; | ||
| default: | ||
| AzureMonitorAspNetCoreEventSource.Log.MapLogLevelFailed(level); | ||
| return LogLevel.None; | ||
| } | ||
| } | ||
|
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| private static string FormatMessage(EventSourceEvent eventSourceEvent, Exception _) => eventSourceEvent.Format(); | ||
|
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| public Task StartAsync(CancellationToken cancellationToken) | ||
| { | ||
| if (_loggerFactory != null) | ||
| { | ||
| _listener ??= new AzureEventSourceListener((e, s) => LogEvent(e), EventLevel.Verbose); | ||
| } | ||
|
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| return Task.CompletedTask; | ||
| } | ||
|
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| public Task StopAsync(CancellationToken cancellationToken) | ||
| { | ||
| _listener?.Dispose(); | ||
| return Task.CompletedTask; | ||
| } | ||
|
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| public void Dispose() | ||
| { | ||
| _listener?.Dispose(); | ||
| } | ||
| } | ||
| } |
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