kamailio/modules/ndb_redis

NDB_REDIS Module

Daniel-Constantin Mierla

   <miconda@gmail.com>

Edited by

Daniel-Constantin Mierla

   <miconda@gmail.com>

   Copyright © 2011 asipto.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. server (str)

        4. Functions

              4.1. redis_cmd(srvname, command, replyid)

   List of Examples

   1.1. Set server parameter
   1.2. redis_cmd 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. server (str)

   4. Functions

        4.1. redis_cmd(srvname, command, replyid)

1. Overview

   This module provides a connector to interact with REDIS NoSQL Database
   from configuration file. You can read more about REDIS at
   http://redis.io.

   It can connect to many REDIS servers and store the results in different
   containers.

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:
     * hiredis - available at https://github.com/antirez/hiredis .

3. Parameters

   3.1. server (str)

3.1. server (str)

   Specify the details to connect to REDIS server. It takes a list of
   attribute=value separated by semicolon, the attributes can be name,
   addr, port and db. Name is a generic identifier to be used with module
   functions. addr and port are the IP address and the port to connect to
   REDIS server. db is the DB number to use (defaults to 0 if not
   specified).

   You can set this parameter many times, in case you want to connect to
   many REDIS servers, just give different attributes and use the specific
   server name when querying the REDIS instance.

   Default value is NULL.

   Example 1.1. Set server parameter
...
modparam("ndb_redis", "server", "name=srvN;addr=127.0.0.1;port=6379;db=1")
modparam("ndb_redis", "server", "name=srvX;addr=127.0.0.2;port=6379;db=4")
...

4. Functions

   4.1. redis_cmd(srvname, command, replyid)

4.1. redis_cmd(srvname, command, replyid)

   Send a command to REDIS server identified by srvname. The reply will be
   stored in a local continer identified by replyid. All the parameters
   can be strings with pseudo-variables that are evaluated at runtime.

   The reply can be accessed via pseudo-variable $redis(key). The key can
   be: type - type of the reply (as in hiredis.h); value - the value
   returned by REDIS server; info - in case of error from REDIS, it will
   contain an info message.

   If reply type is an array (as in hiredis.h), there are other keys
   available:
     * size - returns number of elements in the array.
     * type[n] - returns the type of the nth element in the array. type -
       returns array type.
     * value[n] - returns value of the nth element. value - returns null
       for an array. You need to get each element by index.

   Example 1.2. redis_cmd usage
...
if(redis_cmd("srvN", "INCR cnt", "r")) {
    # success - the incremented value is in $redis(r=>value)
    xlog("===== $redis(r=>type) * $redis(r=>value)\n");
}

# set a value
redis_cmd("srvN", "SET foo bar", "r");

redis_cmd("srvN", "SET ruri $ru", "r");

# get a value
redis_cmd("srvN", "GET foo", "r");

# array example
if(redis_cmd("srvN", "HMGET foo_key field1 field3", "r")) {
    xlog("array size: $redis(r=>size)\n");
    xlog("first values: $redis(r=>value[0]) , $redis(r=>value[1])\n");
}
...