layouts {log4r}

Layouts

Description

In log4j etymology, Layouts are how Appenders control the format of messages.

Some general-purpose layouts are described below.

For implementing your own layouts, see Details.

Usage

default_log_layout(time_format = "%Y-%m-%d %H:%M:%S")

simple_log_layout()

bare_log_layout()

logfmt_log_layout()

json_log_layout()

Arguments

time_format

A valid format string for timestamps. See strptime. For some layouts this can be NA to elide the timestamp.

Details

Layouts are implemented as functions with the interface function(level, ...) and returning a single string.

json_log_layout requires the jsonlite package.

Examples

# The behaviour of a layout can be seen by using them directly:
simple <- simple_log_layout()
simple("INFO", "Input has length ", 0, ".")

with_timestamp <- default_log_layout()
with_timestamp("INFO", "Input has length ", 0, ".")