26 Jan
2013
26 Jan
'13
7:17 p.m.
From my previous experience - I'd like to say this
lib is better than
libjson-c.
2013/1/26 Matthew Williams <matthew(a)flowroute.com>
Last night I pushed an updated json module to branch
mgw/json. It has
significant improvements over the previous version, including:
* A way to access nested elements, using a subset of JSONPath.
* The ability to loop over arrays
Note that there is a change in the external dependency from libjson-c to
libjansson.
Matthew Williams
Documentation:
JSON Module
Joe Hillenbrand
<joe(a)flowroute.com>
Edited by
Matthew Williams
<matthew(a)flowroute.com>
Copyright © 2013 Flowroute LLC (flowroute.com)
__________________________________________________________________
Table of Contents
1. Admin Guide
1. Overview
2. Dependencies
2.1. Kamailio Modules
2.2. External Libraries or Applications
3. Parameters
3.1.
4. Functions
4.1. json_path_get(json_string, json_path, destination)
4.2. json_array_size(json_string, json_path, destination)
4.3. json_get_field(json_string, field_name, destination)
List of Examples
1.1. json_path_get usage
1.2. json_array_size usage
1.3. json_get_field usage
Chapter 1. Admin Guide
Table of Contents
1. Overview
2. Dependencies
2.1. Kamailio Modules
2.2. External Libraries or Applications
3. Parameters
3.1.
4. Functions
4.1. json_path_get(json_string, json_path, destination)
4.2. json_array_size(json_string, json_path, destination)
4.3. json_get_field(json_string, field_name, destination)
1. Overview
This module provides operations on json strings.
2. Dependencies
2.1. Kamailio Modules
2.2. External Libraries or Applications
2.1. Kamailio Modules
The following modules must be loaded before this module:
* None
2.2. External Libraries or Applications
The following libraries or applications must be installed before
running Kamailio with this module loaded:
* jansson (http://www.digip.org/jansson/), tested with: 2.2+
3. Parameters
3.1.
None
4. Functions
4.1. json_path_get(json_string, json_path, destination)
4.2. json_array_size(json_string, json_path, destination)
4.3. json_get_field(json_string, field_name, destination)
4.1. json_path_get(json_string, json_path, destination)
Copy the value at the path from json object 'json_string' and store it
in pvar 'destination'.
The path string supports dot delimited notation (e.g. foo.bar.baz),
array notation (e.g. list[0]), or a combination of the two (e.g.
foo.bar[0][1].baz).
The function can put a string, integer, null, or new json string into
destination.
Example 1.1. json_path_get usage
...
json_path_get($var(myjson), "inner.deep.num", "$var(n)");
xlog("foo is $var(n)");
...
4.2. json_array_size(json_string, json_path, destination)
Puts size of the array in 'json_string' at 'json_path' into the pvar
'destination'.
This is particularly useful for looping through an array. See example.
Example 1.2. json_array_size usage
...
$var(array) = "{\"loopme\":[0,1,2,3,4,5]}";
$var(count) = 0;
json_array_size($var(array), "loopme", "$var(size)");
while($var(count) < $var(size)) {
json_path_get($var(array), "loopme[$var(count)]", "$var(v)");
xlog("loopme[$var(count)] == $var(v)\n");
$var(count) = $var(count) + 1;
}
...
4.3. json_get_field(json_string, field_name, destination)
Copy field 'field_name' from json object 'json_string' and store it
in
pvar 'destination'.
This function is deprecated but kept for backwards compatibility. Right
now it is just a wrapper around json_path_get, and its functionality is
the same.
Example 1.3. json_get_field usage
...
json_get_field("{'foo':'bar'}", "foo",
"$var(foo)");
xlog("foo is $var(foo)");
...
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