ILogger Dependency Injection with Azure Functions

Question

So I'm trying to setup ILogger with Dependency Injection and I'm having some trouble.

In my startup.cs file I have something that looks like this:

        builder.Services.AddLogging();

I then try to feed that logger to my own class (which acts like a wrapper around the ILogger library)

    builder.Services.AddSingleton<LoggingWrapper>(s =>
    {
        return new LoggingWrapper(
            s.GetService<ILoggerFactory>());
    });

So in my Azure function, LoggingWrapper gets injected inside, but it doesn't log anything. The normal ILogger that comes with each function still works, but I'm wondering as to why my wrapper isn't logging anything.

Logging Wrapper is a class that takes the ILogger methods and uses it to create it's own logging methods. For example loggingWrapper.logInformation("string") is a method that would wrap around `ILogger.

I inject this into my other classes like this: s.GetService<ILoggerFactory>()

Thanks in advance for all the help!

Show where the logger is injected and used.

Nkosi
– Nkosi

2020-08-13 23:13:56 +00:00
Commented Aug 13, 2020 at 23:13 — Nkosi
– Nkosi, Commented Aug 13, 2020 at 23:13

pajzo · Accepted Answer · 2020-08-14 06:12:38Z

14

I faced the same problem - you need to setup/allow logging from other sources:

{
  "version": "2.0",
  "logging": {
    "logLevel": {
      "YourNamespace": "Information"
    }
  }
}

More information here:

https://learn.microsoft.com/en-us/azure/azure-functions/functions-host-json#logging

answered Aug 14, 2020 at 6:12

pajzo

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1 Comment

Michael Murphy Over a year ago

Information: This is the host.json file

Colin · Accepted Answer · 2020-08-13 21:56:34Z

1

Do you mean to inject an ILogger?

//NOT...                     <LoggingWrapper>
builder.Services.AddSingleton<ILogger>(s =>
{
    return new LoggingWrapper(
        s.GetService<ILoggerFactory>());
});

answered Aug 13, 2020 at 21:56

Colin

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2 Comments

idude Over a year ago

So LoggerWrapper is a class that hides all the ILogger methods and uses them to create it's own log methods. When I inject it into a class, I do so like s.GetService<IAccountUpdaterLogger>(), but that doesn't seem to work

Colin Over a year ago

@idude s.GetService() is "service location", not "dependency injection". They're similar patterns, but the only thing that will be injected by a given framework is whatever is accepted in the constructor (ILogger in this case). Try having LoggingWrapper implement ILogger, then follow a "decorator" pattern, accepting an internal ILogger when you instantiate it.

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