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// -----------------------------------------------------------------------
// <copyright file="ApplicationInsightsTarget.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation.
// All rights reserved. 2013
// </copyright>
// -----------------------------------------------------------------------
namespace Microsoft.ApplicationInsights.NLogTarget
{
using System;
using System.Collections.Generic;
using System.Globalization;
using Microsoft.ApplicationInsights.Channel;
using Microsoft.ApplicationInsights.DataContracts;
using Microsoft.ApplicationInsights.Extensibility.Implementation;
using Microsoft.ApplicationInsights.Implementation;
using NLog;
using NLog.Common;
using NLog.Targets;
/// <summary>
/// NLog Target that routes all logging output to the Application Insights logging framework.
/// The messages will be uploaded to the Application Insights cloud service.
/// </summary>
[Target("ApplicationInsightsTarget")]
public sealed class ApplicationInsightsTarget : TargetWithLayout
{
private TelemetryClient telemetryClient;
private DateTime lastLogEventTime;
/// <summary>
/// Initializers a new instance of ApplicationInsightsTarget type.
/// </summary>
public ApplicationInsightsTarget()
{
this.Layout = @"${message}";
}
/// <summary>
/// Gets or sets the Application Insights instrumentationKey for your application.
/// </summary>
public string InstrumentationKey { get; set; }
/// <summary>
/// Gets the logging controller we will be using.
/// </summary>
internal TelemetryClient TelemetryClient
{
get { return this.telemetryClient; }
}
internal void BuildPropertyBag(LogEventInfo logEvent, ITelemetry trace)
{
trace.Timestamp = logEvent.TimeStamp;
trace.Sequence = logEvent.SequenceID.ToString(CultureInfo.InvariantCulture);
IDictionary<string, string> propertyBag;
if (trace is ExceptionTelemetry)
{
propertyBag = ((ExceptionTelemetry)trace).Properties;
}
else
{
propertyBag = ((TraceTelemetry)trace).Properties;
}
if (!string.IsNullOrEmpty(logEvent.LoggerName))
{
propertyBag.Add("LoggerName", logEvent.LoggerName);
}
if (logEvent.UserStackFrame != null)
{
propertyBag.Add("UserStackFrame", logEvent.UserStackFrame.ToString());
propertyBag.Add("UserStackFrameNumber", logEvent.UserStackFrameNumber.ToString(CultureInfo.InvariantCulture));
}
this.LoadGlobalDiagnosticsContextProperties(propertyBag);
this.LoadLogEventProperties(logEvent, propertyBag);
}
/// <summary>
/// Initializes the Target and perform instrumentationKey validation.
/// </summary>
/// <exception cref="NLogConfigurationException">Will throw when <see cref="InstrumentationKey"/> is not set.</exception>
protected override void InitializeTarget()
{
base.InitializeTarget();
this.telemetryClient = new TelemetryClient();
if (!string.IsNullOrEmpty(this.InstrumentationKey))
{
this.telemetryClient.Context.InstrumentationKey = this.InstrumentationKey;
}
this.telemetryClient.Context.GetInternalContext().SdkVersion = SdkVersionUtils.GetSdkVersion("nlog:");
}
/// <summary>
/// Send the log message to Application Insights.
/// </summary>
/// <exception cref="ArgumentNullException">If <paramref name="logEvent"/> is null.</exception>
protected override void Write(LogEventInfo logEvent)
{
if (logEvent == null)
{
throw new ArgumentNullException("logEvent");
}
this.lastLogEventTime = DateTime.UtcNow;
if (logEvent.Exception != null)
{
this.SendException(logEvent);
}
else
{
this.SendTrace(logEvent);
}
}
/// <summary>
/// Flush any pending log messages
/// </summary>
/// <param name="asyncContinuation">The asynchronous continuation</param>
protected override void FlushAsync(AsyncContinuation asyncContinuation)
{
try
{
this.TelemetryClient.Flush();
if (DateTime.UtcNow.AddSeconds(-30) > this.lastLogEventTime)
{
// Nothing has been written, so nothing to wait for
asyncContinuation(null);
}
else
{
// Documentation says it is important to wait after flush, else nothing will happen
// https://docs.microsoft.com/azure/application-insights/app-insights-api-custom-events-metrics#flushing-data
System.Threading.Tasks.Task.Delay(TimeSpan.FromMilliseconds(500)).ContinueWith((task) => asyncContinuation(null));
}
}
catch (Exception ex)
{
asyncContinuation(ex);
}
}
private void SendException(LogEventInfo logEvent)
{
var exceptionTelemetry = new ExceptionTelemetry(logEvent.Exception)
{
SeverityLevel = this.GetSeverityLevel(logEvent.Level)
};
string logMessage = this.Layout.Render(logEvent);
exceptionTelemetry.Properties.Add("Message", logMessage);
this.BuildPropertyBag(logEvent, exceptionTelemetry);
this.telemetryClient.Track(exceptionTelemetry);
}
private void SendTrace(LogEventInfo logEvent)
{
string logMessage = this.Layout.Render(logEvent);
var trace = new TraceTelemetry(logMessage)
{
SeverityLevel = this.GetSeverityLevel(logEvent.Level)
};
this.BuildPropertyBag(logEvent, trace);
this.telemetryClient.Track(trace);
}
private void LoadGlobalDiagnosticsContextProperties(IDictionary<string, string> propertyBag)
{
foreach (string key in GlobalDiagnosticsContext.GetNames())
{
this.PopulatePropertyBag(propertyBag, key, GlobalDiagnosticsContext.GetObject(key));
}
}
private void LoadLogEventProperties(LogEventInfo logEvent, IDictionary<string, string> propertyBag)
{
var properties = logEvent.Properties;
if (properties != null)
{
foreach (var keyValuePair in properties)
{
string key = keyValuePair.Key.ToString();
object valueObj = keyValuePair.Value;
this.PopulatePropertyBag(propertyBag, key, valueObj);
}
}
}
private void PopulatePropertyBag(IDictionary<string, string> propertyBag, string key, object valueObj)
{
if (valueObj == null)
{
return;
}
string value = valueObj.ToString();
if (propertyBag.ContainsKey(key))
{
if (value == propertyBag[key])
{
return;
}
key += "_1";
}
propertyBag.Add(key, value);
}
private SeverityLevel? GetSeverityLevel(LogLevel logEventLevel)
{
if (logEventLevel == null)
{
return null;
}
if (logEventLevel.Ordinal == LogLevel.Trace.Ordinal ||
logEventLevel.Ordinal == LogLevel.Debug.Ordinal)
{
return SeverityLevel.Verbose;
}
if (logEventLevel.Ordinal == LogLevel.Info.Ordinal)
{
return SeverityLevel.Information;
}
if (logEventLevel.Ordinal == LogLevel.Warn.Ordinal)
{
return SeverityLevel.Warning;
}
if (logEventLevel.Ordinal == LogLevel.Error.Ordinal)
{
return SeverityLevel.Error;
}
if (logEventLevel.Ordinal == LogLevel.Fatal.Ordinal)
{
return SeverityLevel.Critical;
}
// The only possible value left if OFF but we should never get here in this case
return null;
}
}
}