Creates a new logger, logging to the given file. If the file argument is "-", then log to stdout; if it's "stderr" then we log to stderr, otherwise we log to a regular file in append mode. The file is closed and re-opened every 15 minutes to facilitate external log rotation.

valuenewLoggerWithCustomErrorFunction

:: (ByteString -> IO ())
logger uses this action to log any error messages of its own
-> FilePath
log file to use
-> IO Logger

Source#

Like newLogger, but uses a custom error action if the logger needs to print an error message of its own (for instance, if it can't open the output file.)

valuewithLogger

:: FilePath
log file to use
-> (Logger -> IO a)
-> IO a

Source#

Creates a Logger and passes it into the given function, cleaning up with "stopLogger" afterwards.

valuewithLoggerWithCustomErrorFunction

:: (ByteString -> IO ())
logger uses this action to log any error messages of its own
-> FilePath
log file to use
-> (Logger -> IO a)
-> IO a

Source#

Creates a Logger with "newLoggerWithCustomErrorFunction" and passes it into the given function, cleaning up with "stopLogger" afterwards.

valuestopLogger :: Logger -> IO ()

Source#

Kills a logger thread, causing any unwritten contents to be flushed out to disk

valuelogMsg :: Logger -> ByteString -> IO ()

Source#

Sends out a log message verbatim with a newline appended. Note: if you want a fancy log message you'll have to format it yourself (or use combinedLogEntry).