How to use the name of the input in VRL?

[smitsr72]

How can I write and if statement using the name of the input to make a decision?

[StephenWakely]

So, supposing you had a field called name in your input, you could write something like the following:

if .name == "flub" {
  # Do the thing when name is flub.
} else {
  # Do the thing when name is not flub.
}

You can find more details here.

[smitsr72]

Sorry for the confusion. I want to make a decision based on the name of the input source in a remap vrl.

With the remap transformation the inputs are listed like this:
inputs = ["A", "B", "C"]

Then in the vrl code I want to make a decision based on source A, B or C.

type = "remap" inputs = ["A", "B", "C"] source = ''' if **metadata.input** == "A" { .bla = "A" } else if **metadata.input** == "B" { .bla = "B" } else { .bla = "N/A" } '''

The metadata.input does not exist, I just made that up, to give the idea what I would like to do.

Alternatively, How can I inject the name of the source "A" into the output of the source?

[sources.A]
type = "file"
line_delimiter = "\r\n"
include = [ "C:/logs/*.log" ]
read_from = "beginning"

[StephenWakely]

Ah, I see what you mean. Your best bet would be to have a separate remap transform for each input that adds a field to tag the event with the source.

source = '''
  .input = "A"
'''

Then the final remap can work with this field.

[smitsr72]

I also thought of that workaround. I have many input sources, which means also many remaps just for the purpose of tagging the source in the message output. I will apply this strategy and see how it works out.

[StephenWakely]

I have raised a feature request here to see if we can come up with a better solution for this situation. Feel free to add any further context to that.