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**************
get_property()
**************
Purpose
========
get_property(rsyslog_variable, key_str)
Provides ability to get a rsyslog variable or property using dynamically evaluated parameters.
The first parameter is a valid rsyslog variable or property, the second parameter is a key string, or index value.
Example
========
In the following example, a json string is parsed using parse_json(), and placed into the variable ``$!parsed``.
The get_property function is then used to get property fields from ``$!parsed``.
.. code-block:: none
set $.ret = parse_json("{\"offsets\": [ { \"a\": 9, \"b\": 0 },\
{ \"a\": 9, \"b\": 3 } ],\
\"boolval\": true,\
\"int64val\": 1234567890,\
\"nullval\": null,\
\"doubleval\": 12345.67890 }", "\$!parsed");
# get different fields from $!parsed here
if $.ret == 0 then {
# dynamically evaluate different fields in $!parsed
# do dynamic indexing into array
$.index = 1;
# set $.ret = { "a": 9, "b": 3}
set $.ret = get_property($!parsed!offsets, $.index);
# set $.ret = true;
set $.key = "boolval";
set $.ret = get_property($!parsed, $.key);
# null values are evaluated to empty string
# thus below statement will set $.ret to empty string
set $.ret = get_property($!parsed, "nullval");
# evaluates to 1234567890
set $.key = "int64val";
set $.ret = get_property($!parsed, $.key);
# using a key variable, evaluates to 12345.67890
set $key = "doubleval";
set $.ret = get_property($!parsed, $key);
}
# example of dynamically building key value
set $.foo!barval = 3;
# set $.bar = 3;
set $.bar = get_property($.foo, "bar" & "val");
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