view mod_presence_cache/README.markdown @ 1954:050cd7b6fa96

mod_muc_access_control: Module to allow restricting rooms to a list of JIDs, which can include domains
author Matthew Wild <mwild1@gmail.com>
date Sun, 22 Nov 2015 19:33:09 +0000
parents 9d0c33ebbcc5
children 65beed3ac500
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---
summary: Cache presence incoming presence
...

Introduction
============

This module stores presence from users contact even when they are
offline, so that the client can see who is online faster when they sign
in, and won't have to wait for remote servers to reply.

Note that in its current form, the number of presence stanzas sent to a
client is doubled, as the client would get both the cached stanzas and
replies to presence probes. Also see [mod\_throttle\_presence].

By default, only binary (online or offline) state is stored. It can
optionally store the full presence but this requires much more memory.

Configuration
=============

Just enable the module.

    modules_enabled = {
        -- more modules
        "presence_cache";
    }

Advanced configuration
======================

To enable full stanza caching:

    presence_cache_full = false

TODO
====

-   Deduplication, i.e don's send stanzas that are identical to the last
    seen.
-   Cache invalidation or expiry, eg if a remote server goes down or is
    gone a long time.
-   Sending probes at some interval to keep the cache reasonably fresh.