kamailio/modules/pv

Pseudo-Variables Module

Daniel-Constantin Mierla

asipto.com


Edited by

Daniel-Constantin Mierla



Copyright � 2008-2011 Daniel-Constantin Mierla (asipto.com)

Copyright � 2011 Juha Heinanen

Copyright � 2013 Olle E. Johansson, Edvina AB
__________________________________________________________________

Table of Contents

1. Admin Guide

1. Overview
2. Dependencies

2.1. Kamailio Modules
2.2. External Libraries or Applications

3. Parameters

3.1. shvset (string)
3.2. varset (string)
3.3. avp_aliases (string)

4. Functions

4.1. pv_isset(pvar)
4.2. pv_unset(pvar)
4.3. is_int(pvar)
4.4. typeof(pvar, vtype)
4.5. not_empty(pvar)

5. MI Commands

5.1. shv_set
5.2. shv_get

6. RPC Commands

6.1. pv.shvSet
6.2. pv.shvGet

List of Examples

1.1. shvset parameter usage
1.2. varset parameter usage
1.3. avp_aliases parameter usage
1.4. pv_isset usage
1.5. pv_unset usage
1.6. is_int() usage
1.7. typeof() usage
1.8. not_empty() usage
1.9. shv_set usage
1.10. shv_get 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. shvset (string)
3.2. varset (string)
3.3. avp_aliases (string)

4. Functions

4.1. pv_isset(pvar)
4.2. pv_unset(pvar)
4.3. is_int(pvar)
4.4. typeof(pvar, vtype)
4.5. not_empty(pvar)

5. MI Commands

5.1. shv_set
5.2. shv_get

6. RPC Commands

6.1. pv.shvSet
6.2. pv.shvGet

1. Overview

This module collects the core pseudo-variables that can be used in
configuration file. They are listed in Dokuwiki:
http://www.kamailio.org/wiki/, in Pseudo-Variables section

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:
* No dependencies on other Kamailio modules.

2.2. External Libraries or Applications

The following libraries or applications must be installed before
running Kamailio with this module loaded:
* None.

3. Parameters

3.1. shvset (string)
3.2. varset (string)
3.3. avp_aliases (string)

3.1. shvset (string)

Set the value of a shared variable ($shv(name)). The parameter can be
set many times.

The value of the parameter has the format: _name_ '=' _type_ ':'
_value_
* _name_: shared variable name
* _type_: type of the value
+ "i": integer value
+ "s": string value
* _value_: value to be set

Default value is "NULL".

Example 1.1. shvset parameter usage
...
modparam("pv", "shvset", "debug=i:1")
modparam("pv", "shvset", "pstngw=s:sip:10.10.10.10")
...

3.2. varset (string)

Set the value of a script variable ($var(name)). The parameter can be
set many times.

The value of the parameter has the format: _name_ '=' _type_ ':'
_value_
* _name_: shared variable name
* _type_: type of the value
+ "i": integer value
+ "s": string value
* _value_: value to be set

Default value is "NULL".

Example 1.2. varset parameter usage
...
modparam("pv", "varset", "init=i:1")
modparam("pv", "varset", "gw=s:sip:11.11.11.11;transport=tcp")
...

3.3. avp_aliases (string)

Define aliases for PV AVP names.

Default value is NULL.

Example 1.3. avp_aliases parameter usage
...
modparam("pv","avp_aliases","email=s:email_addr;tmp=i:100")
...

4. Functions

4.1. pv_isset(pvar)
4.2. pv_unset(pvar)
4.3. is_int(pvar)
4.4. typeof(pvar, vtype)
4.5. not_empty(pvar)

4.1. pv_isset(pvar)

Return true if a PV value is different than 'null'.

Meaning of the parameters is as follows:
* pvar - pvar identifier.

This function can be used from ANY_ROUTE.

Example 1.4. pv_isset usage
...
if(pv_isset("$avp("s:x")"))
{
...
}
...

4.2. pv_unset(pvar)

Unset the value of the PV (e.g., delete AVP, set to null).

Meaning of the parameters is as follows:
* pvar - pvar identifier.

This function can be used from ANY_ROUTE.

Example 1.5. pv_unset usage
...
pv_unset("$avp("s:x")");
...

4.3. is_int(pvar)

Function checks if pvar argument contains integer value and returns 1
if it does and -1 otherwise.

Function can be used from all kinds of routes.

Example 1.6. is_int() usage
...
if (is_int("$var(foo)")) {
xlog("L_INFO", "variable foo contains integer value\n");
}
...

4.4. typeof(pvar, vtype)

Returns true if the type of pseudo-variable matches the second
parameter. The second parameter can be: 'int' - type is integer; 'str'
- type is string; 'null' - type is null.

Function can be used from ANYROUTE.

Example 1.7. typeof() usage
...
if (typeof("$var(foo)", "str")) {
xdbg("variable foo is a string\n");
}
...

4.5. not_empty(pvar)

Returns true if the pseudo-variables has the type string and is not
empty value.

Function can be used from all kinds of routes.

Example 1.8. not_empty() usage
...
if (not_empty("$var(foo)")) {
append_hf("X-Foo: $var(foo)\r\n");
}
...

5. MI Commands

5.1. shv_set
5.2. shv_get

5.1. shv_set

Set the value of a shared variable ($shv(name)).

Parameters:
* _name_: shared variable name
* _type_: type of the value
+ "int": integer value
+ "str": string value
* _value_: value to be set

MI FIFO Command Format:
:shv_set:_reply_fifo_file_
_name_
_type_
_value_
_empty_line_

Example 1.9. shv_set usage
...
$ kamctl fifo shv_set debug int 0
...

5.2. shv_get

Get the value of a shared variable ($shv(name)).

Parameters:
* _name_: shared variable name. If this parameter is missing, all
shared variables are returned.

MI FIFO Command Format:
:shv_get:_reply_fifo_file_
_name_
_empty_line_

Example 1.10. shv_get usage
...
$ kamctl fifo shv_get debug
$ kamctl fifo shv_get
...

6. RPC Commands

6.1. pv.shvSet
6.2. pv.shvGet

6.1. pv.shvSet

Set the value of a shared variable ($shv(name)).

Parameters:
* _name_: shared variable name
* _type_: type of the value
+ "int": integer value
+ "str": string value
* _value_: value to be set

6.2. pv.shvGet

Get the value of a shared variable ($shv(name)).

Parameters:
* _name_: shared variable name

If no name is given, all shared variables are listed