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************
Unflatten
************
Purpose
=======
``<result> = unflatten(<source-tree>, <key-separator-character>);``
This function unflattens keys in a JSON object. It provides a way to expand dot-separated fields.
It allows for instance to produce this:
``{ "source": { "ip": "1.2.3.4", "port": 443 } }``
from this source data:
``{ "source.ip": "1.2.3.4", "source.port": 443 }``
Example
=======
Here is a sample use case:
.. code-block:: none
module(load="fmunflatten")
# Say you have the following tree, obtained for instance with mmnormalize.
set $!source.ip = "1.2.3.4";
set $!source.bytes = 3258;
set $!source.geo.country_iso_code = "FR";
set $!destination.ip = "4.3.2.1";
# Now unflatten the keys in the $! tree.
set $.unflatten = unflatten($!, ".");
# You may do this to set back safely the result in $! because the function could
# return a default dummy value of 0 (rsyslog number) if $! was not touched (it
# would evaluate to an empty rsyslog string, which is not a JSON datatype).
if (script_error() == 0) then {
unset $!;
set $! = $.unflatten;
unset $.unflatten;
}
An output of ``$!`` would give this, in pretty-print:
.. code-block:: none
{
"source": {
"ip": "1.2.3.4",
"bytes": 3258,
"geo": {
"country_iso_code": "FR"
}
},
"destination": {
"ip": "4.3.2.1"
}
}
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