Log Level

Log Level

Learning Exercise

While completing Log Level, you'll learn 2 concepts

Instructions

You are running a system that consists of a few applications producing many logs. You want to write a small program that will aggregate those logs and give them labels according to their severity level. All applications in your system use the same log codes, but some of the legacy applications don't support all the codes.

Log code Log label Supported in legacy apps?
0 trace no
1 debug yes
2 info yes
3 warning yes
4 error yes
5 fatal no
? unknown -

1. Return the logging code label

Implement the LogLevel.to_label/2 function. It should take an integer code and a boolean flag telling you if the log comes from a legacy app, and return the label of a log line as an atom. Unknown log codes and codes unsupported in a legacy app should return an unknown label.

LogLevel.to_label(0, false)
# => :trace

LogLevel.to_label(0, true)
# => :unknown

2. Send an alert

Somebody has to be notified when unexpected things happen.

Implement the LogLevel.alert_recipient/2 function to determine to whom the alert needs to be sent. The function should take an integer code and a boolean flag telling you if the log comes from a legacy app, and return the name of the recipient as an atom.

If the log label is error or fatal, send the alert to the ops team. If you receive a log with an unknown label from a legacy system, send the alert to the dev1 team, other unknown labels should be sent to the dev2 team. All other log labels can be safely ignored.

LogLevel.alert_recipient(-1, true)
# => :dev1

LogLevel.alert_recipient(0, false)
# => false
Last updated 29 September 2022
Edit via GitHub The link opens in a new window or tab
Elixir Exercism

Ready to start Log Level?

Sign up to Exercism to learn and master Elixir with 57 concepts, 156 exercises, and real human mentoring, all for free.