Log Level
10 Points
cond
atoms
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 |
| other / not supported | unknown | - |
1. Determine the log 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.
Log codes not specified in the table should return an unknown label. Log codes specified in the table as not supported in legacy apps should also return an unknown label if the log came from a legacy app.
LogLevel.to_label(0, false)
# => :trace
LogLevel.to_label(0, true)
# => :unknown2. 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.
Use the LogLevel.to_label/2 function from the previous task. 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 by returning false.
LogLevel.alert_recipient(-1, true)
# => :dev1
LogLevel.alert_recipient(0, false)
# => falseLog Level
10 Points
cond
atoms
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 |
| other / not supported | unknown | - |
1. Determine the log 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.
Log codes not specified in the table should return an unknown label. Log codes specified in the table as not supported in legacy apps should also return an unknown label if the log came from a legacy app.
LogLevel.to_label(0, false)
# => :trace
LogLevel.to_label(0, true)
# => :unknown2. 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.
Use the LogLevel.to_label/2 function from the previous task. 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 by returning false.
LogLevel.alert_recipient(-1, true)
# => :dev1
LogLevel.alert_recipient(0, false)
# => false