Inject Values into Logging Calls — with_log

with_log_level temporarily overrides the log level of all LogEvents created by target Logger.

with_log_level(level, code, logger = lgr::lgr)

with_log_value(values, code, logger = lgr::lgr)

Arguments

level: integer or character scalar: the desired log level
code: Any R code
logger: a Logger or the name of one (see get_logger()). Defaults to the root logger (lgr::lgr).
values: a named list of values to be injected into the logging calls

Value

whatever code would return

Details

These functions abuses lgr's filter mechanic to modify LogEvents in-place before they passed on the Appenders. Use with care as they can produce hard to reason about code.

Examples

with_log_level("warn", {
  lgr$info("More important than it seems")
  lgr$fatal("Really not so bad")
})
with_log_value(
  list(msg = "overriden msg"),  {
  lgr$info("bar")
  lgr$fatal("FOO")
})