Elektra: Plugin: zeromqrecv

Elektra 0.8.24

Plugin: zeromqrecv

- infos = Information about the zeromqrecv plugin is in keys below
- infos/author = Thomas Wahringer waht@.nosp@m.libe.nosp@m.lektr.nosp@m.a.or.nosp@m.g
- infos/licence = BSD
- infos/provides = notification
- infos/needs =
- infos/recommends =
- infos/placements = postgetstorage
- infos/status = maintained unittest libc global experimental
- infos/description = Receives notifications using a ZeroMq subscriber socket

This plugin is a notification plugin, which receives notifications using ZeroMq subscribe (`ZMQ_SUB`) sockets from the compatible zeromqsend plugin.

## Dependencies

- `libzmq3-dev` (ZeroMQ C bindings > 3.2)

## Usage

The recommended way is to globally mount the plugin together with the zeromqsend plugin:

        kdb global-mount zeromqsend zeromqrecv

This plugin is designed to be used as a transport plugin for Elektra's notification feature. If notification is not enabled (i.e. in the tool `kdb` or in any other application that does not use `elektraNotificationOpen()`) this plugin does performs no operations.

Since ZeroMQ sockets only provide a 1:n mapping (i.e. one publisher with many subscribers or one subscriber and many publishers) the `zeromqsend` and `zeromqrecv` plugins require a XPUB/XSUB endpoint. The kdb tool "hub-zeromq" provides these endpoints.

# Transport Plugin

Mount this plugin globally with default settings to use it as receiving transport plugin for Elektra's notification feature:

> kdb global-mount zeromqrecv

# Configuration

This plugin supports the following configuration options when mounting:

- endpoint: ZeroMQ XPUB or PUB socket to connect to. The `ipc` and `tcp` ZeroMQ transports are recommended. The default value is "tcp://localhost:6001".

# Notification Format

For the notification format please see the `zeromqsend` plugin documentation.