cachedb_redis Module

Table of Contents

1. Admin Guide
1.1. Overview
1.2. Advantages
1.3. Limitations
1.4. Dependencies
1.4.1. OpenSIPS Modules
1.4.2. External Libraries or Applications
1.5. Exported Parameters
1.5.1. cachedb_url (string)
1.5.2. connect_timeout (integer)
1.5.3. query_timeout (integer)
1.6. Exported Functions
1.7. Raw Query Syntax
2. Contributors
2.1. By Commit Statistics
2.2. By Commit Activity
3. Documentation
3.1. Contributors

List of Tables

2.1. Top contributors by DevScore(1), authored commits(2) and lines added/removed(3)
2.2. Most recently active contributors(1) to this module

List of Examples

1.1. Set cachedb_url parameter
1.2. Use Redis servers
1.3. Set connect_timeout parameter
1.4. Set connect_timeout parameter
1.5. Redis Raw Query Examples

Chapter 1. Admin Guide

1.1. Overview

This module is an implementation of a cache system designed to work with a Redis server. It uses hiredis client library to connect to either a single Redis server instance, or to a Redis Server inside a Redis Cluster. It uses the Key-Value interface exported from the core.

1.2. Advantages

  • memory costs are no longer on the server

  • many servers can be used inside a cluster, so the memory is virtually unlimited

  • the cache is 100% persistent. A restart of OpenSIPS server will not affect the DB. The Redis DB is also persistent so it can also be restarted without loss of information.

  • redis is an open-source project so it can be used to exchange data with various other applications

  • By creating a Redis Cluster, multiple OpenSIPS instances can easily share key-value information

1.3. Limitations

  • keys (in key:value pairs) may not contain spaces or control characters

1.4. Dependencies

1.4.1. OpenSIPS Modules


1.4.2. External Libraries or Applications

The following libraries or applications must be installed before running OpenSIPS with this module loaded:

  • hiredis:

    On the latest Debian based distributions, hiredis can be installed by running 'apt-get install libhiredis-dev' Alternatively, if hiredis is not available on your OS repos, hiredis can be downloaded from: . Download the archive, extract sources, run make,sudo make install.

1.5. Exported Parameters

1.5.1. cachedb_url (string)

The urls of the server groups that OpenSIPS will connect to in order to use the from script cache_store,cache_fetch, etc operations. It can be set more than one time. The prefix part of the URL will be the identifier that will be used from the script.

Example 1.1. Set cachedb_url parameter

modparam("cachedb_redis", "cachedb_url","redis:group1://localhost:6379/")
modparam("cachedb_redis", "cachedb_url","redis:cluster1://random_url:8888/")

Example 1.2. Use Redis servers

cache_store("redis:group1","key","$ru value");

1.5.2. connect_timeout (integer)

This parameter specifies how many milliseconds OpenSIPS should wait for connecting to a Redis node.

Default value is 5000 ms.

Example 1.3. Set connect_timeout parameter

# wait 1 seconds for Redis to connect
modparam("cachedb_redis", "connect_timeout",1000)

1.5.3. query_timeout (integer)

This parameter specifies how many milliseconds OpenSIPS should wait for a query response from a Redis node.

Default value is 5000 ms.

Example 1.4. Set connect_timeout parameter

# wait 1 seconds for Redis queries
modparam("cachedb_redis", "query_timeout",1000)

1.6. Exported Functions

The module does not export functions to be used in configuration script.

1.7. Raw Query Syntax

The cachedb_redis module allows to run RAW queries, thus taking full advantage of the capabilities of the back-end. The query syntax is the typical REDIS one.

Here are a couple examples of running some Redis queries :

Example 1.5. Redis Raw Query Examples

	$var(my_hash) = "my_hash_name";
	$var(my_key) = "my_key_name";
	$var(my_value) = "my_key_value";
	cache_raw_query("redis","HSET $var(my_hash) $var(my_key) $var(my_value)");
	cache_raw_query("redis","HGET $var(my_hash) $var(my_key)","$avp(result)");
	xlog("We have fetched $avp(result) \n");
	$var(my_hash) = "my_hash_name";
	$var(my_key1) = "my_key1_name";
	$var(my_key2) = "my_key2_name";
	$var(my_value1) = "my_key1_value";
	$var(my_value2) = "my_key2_value";
	cache_raw_query("redis","HSET $var(my_hash) $var(my_key1) $var(my_value1)");
	cache_raw_query("redis","HSET $var(my_hash) $var(my_key2) $var(my_value2)");
	cache_raw_query("redis","HGETALL $var(my_hash)","$avp(result)");

	$var(it) = 0;
	while ($(avp(result_final)[$var(it)]) != NULL) {
		xlog("Multiple key reply: - we have fetched $(avp(result_final)[$var(it)]) \n");
		$var(it) = $var(it) + 1;

Chapter 2. Contributors

2.1. By Commit Statistics

Table 2.1. Top contributors by DevScore(1), authored commits(2) and lines added/removed(3)

 NameDevScoreCommitsLines ++Lines --
1. Vlad Paiu (@vladpaiu)3017142843
2. Razvan Crainea (@razvancrainea)11912334
3. Bogdan-Andrei Iancu (@bogdan-iancu)6461
4. Liviu Chircu (@liviuchircu)531231
5. jalung5114461
6. Ezequiel Lovelle31114
7. Julián Moreno Patiño3111
8. Jarrod Baumann (@jarrodb)21120
9. Kristian Høgh21120

(1) DevScore = author_commits + author_lines_added / (project_lines_added / project_commits) + author_lines_deleted / (project_lines_deleted / project_commits)

(2) including any documentation-related commits, excluding merge commits. Regarding imported patches/code, we do our best to count the work on behalf of the proper owner, as per the "fix_authors" and "mod_renames" arrays in opensips/doc/ If you identify any patches/commits which do not get properly attributed to you, please submit a pull request which extends "fix_authors" and/or "mod_renames".

(3) ignoring whitespace edits, renamed files and auto-generated files

2.2. By Commit Activity

Table 2.2. Most recently active contributors(1) to this module

 NameCommit Activity
1. Bogdan-Andrei Iancu (@bogdan-iancu)Oct 2014 - Aug 2018
2. Liviu Chircu (@liviuchircu)Mar 2014 - Jun 2018
3. Kristian HøghApr 2016 - Apr 2016
4. Julián Moreno PatiñoFeb 2016 - Feb 2016
5. Razvan Crainea (@razvancrainea)Feb 2012 - Jan 2016
6. Jarrod Baumann (@jarrodb)May 2015 - May 2015
7. jalungJun 2014 - Jun 2014
8. Vlad Paiu (@vladpaiu)Oct 2011 - Nov 2013
9. Ezequiel LovelleMay 2013 - May 2013

(1) including any documentation-related commits, excluding merge commits

Chapter 3. Documentation

3.1. Contributors

Last edited by: Bogdan-Andrei Iancu (@bogdan-iancu), Liviu Chircu (@liviuchircu), Julián Moreno Patiño, Razvan Crainea (@razvancrainea), Vlad Paiu (@vladpaiu).

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