How to use dependency inject for TelemetryConfiguration in Azure Function - azure

Question

I try to use Dependency injection in Azure Functions for TelemetryConfiguration. In my function I will have it resolved when I inject TelemetryConfiguration in the functions constructor. I suppose I don't really understand how I will do with TelemetryConfiguration in StartUp, thats why I get an exception. How will I add the TelemetryConfiguration I already configured.
I have did an easy example here what I'm doing so far.
[assembly: FunctionsStartup(typeof(StartUp))]
public class StartUp : FunctionsStartup
{
private string OmsModule { get; } = "OMS.VA";
public override void Configure(IFunctionsHostBuilder builder)
{
builder.Services.Configure<TelemetryConfiguration>(
(o) =>
{
o.InstrumentationKey = Environment.GetEnvironmentVariable("APPINSIGHTS_INSTRUMENTATIONKEY");
o.TelemetryInitializers.Add(new OperationCorrelationTelemetryInitializer());
});
}
}
public class StopPlaceUpdateTimerTrigger
{
private TelemetryClient _telemetryClient;
private string _azureWebJobsStorage;
public StopPlaceUpdateTimerTrigger(TelemetryConfiguration telemetryConfiguration)
{
_telemetryClient = new TelemetryClient(telemetryConfiguration);
}
[FunctionName("StopPlaceLoader")]
public async Task StopPlaceLoaderMain([TimerTrigger("%CRON_EXPRESSION%", RunOnStartup = true)]TimerInfo myTimerInfo, ILogger log, ExecutionContext context)
{
SetConfig(context);
var cloudTable = await GetCloudTableAsync();
if (cloudTable == null)
{
//Do nothing
}
//Do nothing
}
private async Task<CloudTable> GetCloudTableAsync()
{
var storageAccount = CloudStorageAccount.Parse(_azureWebJobsStorage);
var tableClient = storageAccount.CreateCloudTableClient();
var table = tableClient.GetTableReference(nameof(StopPlaceLoaderCacheRecord));
if (!await table.ExistsAsync())
{
await table.CreateIfNotExistsAsync();
}
return table;
}
private void SetConfig(ExecutionContext context)
{
var config = new ConfigurationBuilder()
.SetBasePath(context.FunctionAppDirectory)
.AddJsonFile("local.settings.json", optional: true)
.AddEnvironmentVariables()
.Build();
_azureWebJobsStorage = config["AzureWebJobsStorage"];
}
}
//local.settings.json
{
"IsEncrypted": false,
"Values": {
"AzureWebJobsStorage": "DefaultEndpointsProtocol...",
"FUNCTIONS_WORKER_RUNTIME": "dotnet",
"EnableMSDeployAppOffline": "True",
"CRON_EXPRESSION": "0 */5 22-3 * * *",
"APPINSIGHTS_INSTRUMENTATIONKEY": "..."
}
}
I get the following Exception;
Microsoft.Extensions.DependencyInjection.Abstractions: Unable to resolve service for type 'Microsoft.ApplicationInsights.Extensibility.TelemetryConfiguration' while attempting to activate 'OMS.VA.RealTime.StopPlaceLoader.StopPlaceUpdateTimerTrigger'.

Answer 1

Update:
We can change this line of code var newConfig = TelemetryConfiguration.Active; to var newConfig = TelemetryConfiguration.CreateDefault(); , since TelemetryConfiguration.Active is deprecated.
Please use the code below for TelemetryConfiguration DI, I test it with a blob trigger function and works well:
using System.IO;
using System.Linq;
using Microsoft.ApplicationInsights;
using Microsoft.ApplicationInsights.Extensibility;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
[assembly: WebJobsStartup(typeof(FunctionApp17.MyStartup))]
namespace FunctionApp17
{
public class MyStartup : IWebJobsStartup
{
public void Configure(IWebJobsBuilder builder)
{
var configDescriptor = builder.Services.SingleOrDefault(tc => tc.ServiceType == typeof(TelemetryConfiguration));
if (configDescriptor?.ImplementationFactory != null)
{
var implFactory = configDescriptor.ImplementationFactory;
builder.Services.Remove(configDescriptor);
builder.Services.AddSingleton(provider =>
{
if (implFactory.Invoke(provider) is TelemetryConfiguration config)
{
var newConfig = TelemetryConfiguration.Active;
newConfig.ApplicationIdProvider = config.ApplicationIdProvider;
newConfig.InstrumentationKey = config.InstrumentationKey;
return newConfig;
}
return null;
});
}
}
}
public class Function1
{
private TelemetryClient _telemetryClient;
public Function1(TelemetryConfiguration telemetryConfiguration)
{
_telemetryClient = new TelemetryClient(telemetryConfiguration);
}
[FunctionName("Function1")]
public void Run([BlobTrigger("samples-workitems/{name}", Connection = "AzureWebJobsStorage")]Stream myBlob, string name, ILogger log)
{
log.LogInformation($"!!!!!!!!!! C# Blob trigger function Processed blob\n Name:{name} \n Size: {myBlob.Length} Bytes");
_telemetryClient.TrackTrace("this is a test message from DI of telemetry client !!!!!!!!!!!!!!");
}
}
}
the test result as below, I can see the logs in the application insights in azure portal:
And one more thing, I see you try to use ITelemetry Initializer in your code. You can follow this GitHub issue for your ITelemetry Initializer or Itelemetry Processor

Answer 2

If you use builder.Services.Configure<TelemetryConfiguration>() to configure, you are using Options pattern in ASP.NET Core.
To access the option, you need to do as following:
public StopPlaceUpdateTimerTrigger(IOptionsMonitor<TelemetryConfiguration> telemetryConfiguration)
{
_telemetryClient = new TelemetryClient(telemetryConfiguration.CurrentValue);
}
If you just want to directly use TelemetryConfiguration object, you need to add it in service collection:
builder.Services.AddSingleton<TelemetryConfiguration >(sp =>
{
var telemetryConfiguration = new TelemetryConfiguration();
telemetryConfiguration.InstrumentationKey = Environment.GetEnvironmentVariable("APPINSIGHTS_INSTRUMENTATIONKEY");
telemetryConfiguration.TelemetryInitializers.Add(new OperationCorrelationTelemetryInitializer());
return telemetryConfiguration;
}
Then you can :
public StopPlaceUpdateTimerTrigger(TelemetryConfiguration telemetryConfiguration)
{
_telemetryClient = new TelemetryClient(telemetryConfiguration);
}
Hope it helps.