Azure
Unable to log errors during startup or dependency injection (DI) of function dependencies
What problem would the feature you're requesting solve? Please describe.
The Azure Function host doesn't catch and display errors during startup or dependency injection of function dependencies. Instead a generic error is shown (see below).
If I try to catch and log errors myself, then I can't assume Application Insights to be configured, so I would need to log to the console. But if I do that, then nothing is logged, not even if I inspect the filesystem logs, where nothing is ever written.
Could you please describe how to catch and log startup and dependency injection errors, so I can inspect them, including stack traces?
The Azure Function host won't let me log information in Program.cs, when creating and running a HostBuilder in Azure.
Describe the solution you'd like
I would like to be provided with a stack trace of the exception and/or being able to catch and log such errors myself to the console.
Describe alternatives you've considered
I don't think I have any alternatives
Additional context
Azure Functions host: 4.x Language: .NET 8 (dotnet-isolated) Service plan: Linux / Consumption plan
Azure Function App Test/Run Error:
Program.cs:
var loggerFactory = LoggerFactory.Create(builder => builder.AddConsole());
var logger = loggerFactory.CreateLogger("Startup");
logger.LogInformation("The application is starting...");
var host = new HostBuilder()
.ConfigureFunctionsWebApplication()
.ConfigureAppConfiguration(builder =>
{
var environment = Environment.GetEnvironmentVariable("ENVIRONMENT") ?? "development";
builder.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
.AddJsonFile($"appsettings.{environment}.json", optional: true, reloadOnChange: true)
.AddEnvironmentVariables();
})
.ConfigureServices((context, services) =>
{
services.AddApplicationInsightsTelemetryWorkerService();
services.ConfigureFunctionsApplicationInsights();
services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies());
services.AddDbContext<AssetOwnershipContext>((sp, options) =>
{
var logger = sp.GetRequiredService<ILogger>();
var connectionString = context.Configuration.GetConnectionString("SqlServer") ?? throw new ConfigurationErrorsException("Connection string not found");
logger.LogInformation("Using connection string: {connectionString}", connectionString);
options.UseSqlServer(connectionString);
});
services.AddScoped<IApplicationService, ApplicationService>();
services.AddScoped<IEmailDispatcher, EmailDispatcher>();
services.AddTransient<IAssetOwnershipRepository, AssetOwnershipRepository>();
services.AddSingleton<GraphServiceClient>(sp =>
new GraphServiceClient(
new DefaultAzureCredential(new DefaultAzureCredentialOptions()
{
ExcludeSharedTokenCacheCredential = true
})
)
);
})
.Build();
host.Run();
@bhagyshricompany Thank you. Also filesystem logs is not working for this setup:
Normally, I would get a connection successful status
I checked one sample function creation to log error its working fine.
Thank you. Yes, it's working fine locally, but not in Azure. Have you tried to deploy your function app?
Yes, viewing filesystem logging is not working
On Tue, 1 Oct 2024 at 11.03, bhagyshricompany @.***> wrote:
can you try it again.
— Reply to this email directly, view it on GitHub https://github.com/Azure/azure-functions-host/issues/10474#issuecomment-2385220967, or unsubscribe https://github.com/notifications/unsubscribe-auth/ADLPSPCEAGL6DHBL6UI5UH3ZZJQOPAVCNFSM6AAAAABOJZKWXKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDGOBVGIZDAOJWG4 . You are receiving this because you authored the thread.Message ID: @.***>
This has been addressed in the latest version of the host (4.1037). Deployment is actively rolling out.
Closing as resolved, but let us know if you have any questions or problems.
