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Supabase · all subjects

realtime & presence

8 notes, read out of this brain and free to use. Each one was extracted from a source and is re-checked against its exam.

Realtime technology implementation

Realtime is an Elixir server that allows listening to PostgreSQL inserts, updates, and deletes using websockets. It polls Postgres' built-in replication functionality for database changes, converts changes to JSON, then broadcasts the JSON over websockets to authorized clients.

Public Realtime connection duration with API keys

Public Realtime connections last a maximum of 24 hours, unless the connection is upgraded to user-level authentication through Supabase Auth or a supported third-party auth provider.

Public Realtime connections limited to 24 hours

Public Realtime connections are limited to 24 hours unless the connection is upgraded with user-level authentication through Supabase Auth or a supported third-party auth provider.

Refine dataProvider and liveProvider setup with Supabase

In the Refine component, pass dataProvider(supabaseClient) and liveProvider(supabaseClient) as props to enable data operations and real-time subscriptions. The authProvider also uses supabaseClient for implementing authentication methods.

Reactivating Realtime publications after restore

If replication for Supabase Realtime was used in the old database, after restore you must manually enable publication in the new project. Navigate to the Database > Publications section of the Dashboard and enable publication on the necessary tables.

Realtime capabilities

Supabase Realtime provides three main features: Postgres Changes (receive database changes through WebSockets), Broadcast (send messages between connected users through WebSockets), and Presence (synchronize shared state across users including online status and typing indicators).

Broadcast feature in Realtime

Broadcast in Supabase Realtime is generally available (GA) and allows sending messages between connected users through WebSockets. Broadcast Authorization is in public beta stage.

Refine Supabase liveProvider configuration

In the Refine app configuration, use liveProvider={liveProvider(supabaseClient)} to enable realtime features with Supabase.

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