Pseudo-Variables Module

Daniel-Constantin Mierla

   asipto.com
   <daniel@asipto.com>

Edited by

Daniel-Constantin Mierla

   <daniel@asipto.com>

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

   Copyright © 2011 Juha Heinanen
     __________________________________________________________________

   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

   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

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
...
