1Apache::LogRegex(3)   User Contributed Perl Documentation  Apache::LogRegex(3)
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NAME

6       Apache::LogRegex - Parse a line from an Apache logfile into a hash
7

VERSION

9       version 1.71
10

SYNOPSIS

12         use Apache::LogRegex;
13
14         my $lr;
15
16         eval { $lr = Apache::LogRegex->new($log_format) };
17         die "Unable to parse log line: $@" if ($@);
18
19         my %data;
20
21         while ( my $line_from_logfile = <> ) {
22             eval { %data = $lr->parse($line_from_logfile); };
23             if (%data) {
24                 # We have data to process
25             } else {
26                 # We could not parse this line
27             }
28         }
29
30         # or generate a closure for better performance
31
32         my $parser = $lr->generate_parser;
33
34         while ( my $line_from_logfile = <> ) {
35             my $data = $parser->($line_from_logfile) or last;
36             # We have data to process
37         }
38

DESCRIPTION

40   Overview
41       A simple class to parse Apache access log files. It will construct a
42       regex that will parse the given log file format and can then parse
43       lines from the log file line by line returning a hash of each line.
44
45       The field names of the hash are derived from the log file format. Thus
46       if the format is '%a %t \"%r\" %s %b %T \"%{Referer}i\" ...' then the
47       keys of the hash will be %a, %t, %r, %s, %b, %T and %{Referer}i.
48
49       Should these key names be unusable, as I guess they probably are, then
50       subclass and provide an override rename_this_name() method that can
51       rename the keys before they are added in the array of field names.
52
53       This module supports variable spacing between elements that are
54       surrounded by quotes, so if you have more than one space between those
55       elements in your format or in your log file, that should be OK.
56

SUBROUTINES/METHODS

58   Constructor
59       Apache::LogRegex->new( FORMAT )
60           Returns a Apache::LogRegex object that can parse a line from an
61           Apache logfile that was written to with the FORMAT string. The
62           FORMAT string is the CustomLog string from the httpd.conf file.
63
64   Class and object methods
65       parse( LINE )
66           Given a LINE from an Apache logfile it will parse the line and
67           return all the elements of the line indexed by their corresponding
68           format string. In scalar context this takes the form of a hash
69           reference, in list context a flat paired list. In either context,
70           if the line cannot be parsed a false value will be returned.
71
72       generate_parser( LIST )
73           Generate and return a closure that, when called with a line, will
74           return a hash reference containing the parsed fields, or undef if
75           the parse failed. If LIST is supplied, it is interpreted as a
76           flattened hash of arguments. One argument is recognised; if
77           "reuse_record" is a true value, then the closure will reuse the
78           same hash reference each time it is called. The default is to
79           allocate a new hash for each result.
80
81           Calling this closure is significantly faster than the "parse"
82           method.
83
84       names()
85           Returns a list of field names that were extracted from the data.
86           Such as '%a', '%t' and '%r' from the above example.
87
88       regex()
89           Returns a copy of the regex that will be used to parse the log
90           file.
91
92       rename_this_name( NAME )
93           Use this method to rename the keys that will be used in the
94           returned hash.  The initial NAME is passed in and the method should
95           return the new name.
96

CONFIGURATION AND ENVIRONMENT

98       Perl 5
99

DIAGNOSTICS

101       The various custom time formats could be problematic but providing that
102       they are encased in '[' and ']' all should be fine.
103
104       Apache::LogRegex->new() takes 1 argument
105           When the constructor is called it requires one argument. This
106           message is given if more or less arguments were supplied.
107
108       Apache::LogRegex->new() argument 1 (FORMAT) is undefined
109           The correct number of arguments were supplied with the constructor
110           call, however the first argument, FORMAT, was undefined.
111
112       Apache::LogRegex->parse() takes 1 argument
113           When the method is called it requires one argument. This message is
114           given if more or less arguments were supplied.
115
116       Apache::LogRegex->parse() argument 1 (LINE) is undefined
117           The correct number of arguments were supplied with the method call,
118           however the first argument, LINE, was undefined.
119
120       Apache::LogRegex->names() takes no argument
121           When the method is called it requires no arguments. This message is
122           given if some arguments were supplied.
123
124       Apache::LogRegex->regex() takes no argument
125           When the method is called it requires no arguments. This message is
126           given if some arguments were supplied.
127

BUGS

129       None so far
130

FILES

132       None
133

SEE ALSO

135       mod_log_config for a description of the Apache format commands
136

THANKS

138       Peter Hickman wrote the original module and maintained it for several
139       years. He kindly passed maintainership on just prior to the 1.51
140       release. Most of the features of this module are the fruits of his
141       work. If you find any bugs they are my doing.
142

AUTHOR

144       Original code by Peter Hickman <peterhi@ntlworld.com>
145
146       Additional code by Andrew Kirkpatrick <ubermonk@gmail.com>
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149       Original code copyright (c) 2004-2006 Peter Hickman. All rights
150       reserved.
151
152       Additional code copyright (c) 2013 Andrew Kirkpatrick. All rights
153       reserved.
154
155       This module is free software. It may be used, redistributed and/or
156       modified under the same terms as Perl itself.
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160perl v5.32.0                      2020-07-28               Apache::LogRegex(3)
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