Subscribe Flow
Last updated
Last updated
In this section the subscription flow is described. VerneMQ provides several hooks to intercept the subscription flow. The most important ones are the auth_on_subscribe
and auth_on_subscribe_m5
hooks which act as an application level firewall granting or rejecting subscribe requests.
The auth_on_subscribe
and auth_on_subscribe_m5
hooks allow your plugin to grant or reject subscribe requests sent by a client. They also makes it possible to rewrite the subscribe topic and qos. The auth_on_subscribe
hook is specified in the Erlang behaviour auth_on_subscribe_hook and the auth_on_subscribe
hook in the auth_on_subscribe_m5_hook behaviour available in the vernemq_dev repo.
The on_subscribe
and on_subscribe_m5
hooks allow your plugin to get informed about an authorized subscribe request. The on_subscribe
hook is specified in the Erlang behaviour on_subscribe_hook and the on_subscribe_m5
hook in the on_subscribe_m5_hook behaviour available in the vernemq_dev repo.
The on_unsubscribe
and on_unsubscribe_m5
hooks allow your plugin to get informed about an unsubscribe request. They also allow you to rewrite the unsubscribe topic if required. The on_subscribe
hook is specified in the Erlang behaviour on_unsubscribe_hook and the on_unsubscribe_m5
hook in the on_unsubscribe_m5_hook behaviour available in the vernemq_dev repo.