You are running a system that consist 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 | - |
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(1, false)
# => :debug
LogLevel.to_label(1, true)
# => :unknownSomebody 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 the log label is unknown and it comes from a legacy system, send the alert to the dev1 team, otherwise send it to the dev2 team. All other log labels can be safely ignored.
LogLevel.alert_recipient(-1, true)
# => :dev1
LogLevel.alert_recipient(0, false)
# => false