Logging errors with restrserve - r

Question

I am currently creating a REST API with restrserve.
While trying to add a logger to my application I ran into this problem.
By setting the log level as: application$logger$set_log_level("error"),
my console output on error has a JSON structure like:
{
"timestamp":"2020-09-22 18:25:37.425642",
"level":"ERROR",
"name":"Application",
"pid":38662,
"msg":"",
"context":{
"request_id":"alphanumeric string",
"message":{ here is the description of the error }
}
}
I set up a printer function following the instructions on the site, but among the available fields (timestamp, level, logger_name, pid, message), "context" is not present,so basically, by just printing the message my logs are empty files.
This is my printer function:
application$logger$set_printer(FUN = function(timestamp, level, logger_name, pid, message, ...){
write(message, file = paste("/Log/Monitor_", pid,
timestamp, ".txt", sep = ""))
# attempting to print "context" raises an error!
})
Is there a way to print the "context" field present in the console output to a file?
Thanks in advance, any suggestions would be very helpful

Answer 1

It is always a good idea to take a look to the source. There is extra ... argument where context is passed.
Generally it is advisable to use lgr package for user-level logging.