Provided by: liblog-dispatchouli-perl_3.007-1_all 
NAME
Log::Fmt - a little parser and emitter of structured log lines
VERSION
version 3.007
OVERVIEW
This library primarily exists to service Log::Dispatchouli's "log_event" methods. It converts an
arrayref of key/value pairs to a string that a human can scan tolerably well, and which a machine can
parse about as well. It can also do that tolerably-okay parsing for you.
PERL VERSION
This library should run on perls released even a long time ago. It should work on any version of perl
released in the last five years.
Although it may work on older versions of perl, no guarantee is made that the minimum required version
will not be increased. The version may be increased for any reason, and there is no promise that patches
will be accepted to lower the minimum required perl.
METHODS
format_event_string
my $string = Log::Fmt->format_event_string([
key1 => $value1,
key2 => $value2,
]);
Note especially that if any value to encode is a reference to a reference, then String::Flogger is used
to encode the referenced value. This means you can embed, in your logfmt, a JSON dump of a structure by
passing a reference to the structure, instead of passing the structure itself.
parse_event_string
my $kv_pairs = Log::Fmt->parse_event_string($string);
Given the kind of string emitted by "format_event_string", this method returns a reference to an array of
key/value pairs.
This isn't exactly a round trip. First off, the formatting can change illegal keys by replacing
characters with question marks, or replacing empty strings with tildes. Secondly, the formatter will
expand some values like arrayrefs and hashrefs into multiple keys, but the parser will not recombined
those keys into structures. Also, there might be other asymmetric conversions. That said, the string
escaping done by the formatter should correctly reverse.
If the input string is badly formed, hunks that don't appear to be value key/value pairs will be
presented as values for the key "junk".
parse_event_string_as_hash
my $hashref = Log::Fmt->parse_event_string_as_hash($line);
This parses the given line as logfmt, then puts the key/value pairs into a hash and returns a reference
to it.
Because nothing prevents a single key from appearing more than once, you should use this with the
understanding that data could be lost. No guarantee is made of which value will be preserved.
AUTHOR
Ricardo SIGNES <cpan@semiotic.systems>
COPYRIGHT AND LICENSE
This software is copyright (c) 2023 by Ricardo SIGNES.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5
programming language system itself.