NAME

App::ElasticSearch::Utilities::QueryString::FileExpansion - Build a terms query from unique values in a column of a file

VERSION

version 7.8

SYNOPSIS

App::ElasticSearch::Utilities::QueryString::FileExpansion

If the match ends in .dat, .txt, .csv, or .json then we attempt to read a file with that name and OR the condition:

    $ cat test.dat
    50  1.2.3.4
    40  1.2.3.5
    30  1.2.3.6
    20  1.2.3.7

Or

    $ cat test.csv
    50,1.2.3.4
    40,1.2.3.5
    30,1.2.3.6
    20,1.2.3.7

Or

    $ cat test.txt
    1.2.3.4
    1.2.3.5
    1.2.3.6
    1.2.3.7

Or

    $ cat test.json
    { "ip": "1.2.3.4" }
    { "ip": "1.2.3.5" }
    { "ip": "1.2.3.6" }
    { "ip": "1.2.3.7" }

We can source that file:

    src_ip:test.dat      => src_ip:(1.2.3.4 1.2.3.5 1.2.3.6 1.2.3.7)
    src_ip:test.json[ip] => src_ip:(1.2.3.4 1.2.3.5 1.2.3.6 1.2.3.7)

This make it simple to use the --data-file output options and build queries based off previous queries. For .txt and .dat file, the delimiter for columns in the file must be either a tab or a null. For files ending in .csv, Text::CSV_XS is used to accurate parsing of the file format. Files ending in .json are considered to be newline-delimited JSON.

You can also specify the column of the data file to use, the default being the last column or (-1). Columns are zero-based indexing. This means the first column is index 0, second is 1, .. The previous example can be rewritten as:

    src_ip:test.dat[1]

or: src_ip:test.dat[-1]

For newline delimited JSON files, you need to specify the key path you want to extract from the file. If we have a JSON source file with:

    { "first": { "second": { "third": [ "bob", "alice" ] } } }
    { "first": { "second": { "third": "ginger" } } }
    { "first": { "second": { "nope":  "fred" } } }

We could search using:

    actor:test.json[first.second.third]

Which would expand to:

    { "terms": { "actor": [ "alice", "bob", "ginger" ] } }

This option will iterate through the whole file and unique the elements of the list. They will then be transformed into an appropriate terms query.

AUTHOR

Brad Lhotsky <brad@divisionbyzero.net>

COPYRIGHT AND LICENSE

This software is Copyright (c) 2020 by Brad Lhotsky.

This is free software, licensed under:

  The (three-clause) BSD License