Azure Function - ILogger is not logging? - azure

Question

I have an azure function, it logs the information without any issues.
namespace aspnetcore_azurefun_blob
{
[StorageAccount("AzureWebJobsStorage")]
public class FileTrigger
{
#region Property
private readonly IFileProcessor fileProcessor;
#endregion
#region Constructor
public FileTrigger(IFileProcessor fileProcessor)
{
this.fileProcessor = fileProcessor;
}
#endregion
[FunctionName("FileTrigger")]
public void ProcessFilesFromSamplesContainer([BlobTrigger("samples-workitems/{name}")]Stream myBlob, string name, ILogger log, ExecutionContext context)
{
log.LogInformation("Function: ProcessFilesFromSamplesContainer is called");
log.LogInformation($"C# Blob trigger function Processed blob\n Name:{name} \n Size: {myBlob.Length} Bytes");
var result = fileProcessor.ProcessAsync(myBlob, name);
log.LogInformation($"Function Completed Successfully on {DateTime.Now.ToLongDateString()} # {DateTime.Now.ToShortTimeString()}.\n.");
}
However, I also have the business logic implemented using DI and below is the excerpt of the implementation.
ServiceBase.cs
namespace BusinessService.Services.Common
{
public abstract class ServiceBase<T>
{
public static AppDbContext AppDbContext;
public static ILogger<T> Logger { get; set; }
public static AppConfigurator Configurator { get; set; }
public ServiceBase(AppDbContext appDbContext, ILogger<T> logger, IOptions<AppConfigurator> configurator)
{
AppDbContext = appDbContext ?? throw new ArgumentNullException(nameof(appDbContext));
Logger = logger ?? throw new ArgumentNullException(nameof(logger));
Configurator = configurator.Value ?? throw new ArgumentNullException(nameof(configurator));
}
}
}
FileProcessingService.cs
namespace BusinessService.Services
{
public interface IFileProcessingService
{
void Process(Stream myBlob, string name);
}
public class FileProcessingService : ServiceBase<FileProcessingService>, IFileProcessingService
{
#region Constructor
public FileProcessingService(AppDbContext appDbContext, ILogger<FileProcessingService> logger, IOptions<AppConfigurator> configurator)
: base(appDbContext, logger, configurator) { }
#endregion
#region Public Methods
public void Process(Stream myBlob, string name)
{
AppDbContext.FileRecords.Add(new FileRecords
{
FileName = name,
IsCompleted = DefaultValues.IsCompleted
});
AppDbContext.SaveChanges();
Logger.LogInformation("Reading configuration from the configuration settings file: {Configurator.AzureSQLServerConfigurator.ConnnectionString}");
Logger.LogInformation("Database is updated..!");
}
#endregion
}
}
Line#34 and #35 doesn't Log anything
Logger.LogInformation("Reading configuration from the configuration settings file: {Configurator.AzureSQLServerConfigurator.ConnnectionString}");
Logger.LogInformation("Database is updated..!");
DependencyRegistrar.cs
namespace CrossCutting.DependencyInjection
{
public static class DependencyRegistrar
{
public static void Intialize(this IServiceCollection services)
{
// Initialize App Settings from Configurator Settings Json file
services.AddOptions<AppConfigurator>()
.Configure<IConfiguration>((settings, configuration) =>
{
configuration.GetSection("AppConfigurator").Bind(settings);
})
.Validate((c) =>
{
return !new[] { c.AzureSQLServerConfigurator.ConnnectionString }.Any(s => String.IsNullOrWhiteSpace(s));
});
}
}
}
What am I missing so that FileProcessingService.cs will log the information ?

Answer 1

I have checked your code in our end I could get the logging information. In your code i have noticed in your code you are using the Logger instead of logger.
Because in your Region Constructor you are using ILogger<FileProcessingService> logger from here you have to call the logger to push your logging information into Application Insights/Function execution panel (Output console window)
#region Constructor
public FileProcessingService(AppDbContext appDbContext, ILogger<FileProcessingService> logger, IOptions<AppConfigurator> configurator)
: base(appDbContext, logger, configurator) { }
#endregion
#region Public Methods
public void Process(Stream myBlob, string name)
{
AppDbContext.FileRecords.Add(new FileRecords
{
FileName = name,
IsCompleted = DefaultValues.IsCompleted
});
AppDbContext.SaveChanges();
# changed Logger into logger
logger.LogInformation("Reading configuration from the configuration settings file: {Configurator.AzureSQLServerConfigurator.ConnnectionString}");
logger.LogInformation("Database is updated..!");
}
#endregion
Still if not able to push the logs you can add your namespace in your host.json file to avoid missing the logging
{
"version": "2.0",
"logging": {
"logLevel": {
// Here you can use your Project namespace like BusinessService.Services
"<namespace>": "Information"
}
}
}