caravel/backend/spec/infra.md

pub struct Infra

Infra is a service which listens for activity and synchronizes relay updates to a remote zooid instance via api_url.

Members:

• api_url: String - the URL of the zooid instance to be managed, from ZOOID_API_URL
• query: Query
• command: Command

pub fn new(query: Query, command: Command) -> Self

• Reads environment and populates members

pub async fn start(self)

• Subscribes to command.notify
• On startup, schedules delayed sync retries for relays whose sync_error is non-empty.
• Loops on rx.recv(), calling handle_activity for each received Activity.

async fn handle_activity(&self, activity: &Activity)

• For create_relay, update_relay, activate_relay, or deactivate_relay activity, calls sync_and_report immediately.
• For fail_relay_sync, schedules a delayed retry using exponential backoff based on consecutive failures for the relay.
• Retry scheduling stops after the configured max attempts to avoid infinite retry loops.
• Other activity types are ignored (e.g. complete_relay_sync).

async fn sync_and_report(&self, relay: &Relay, is_new: bool)

• Calls sync_relay and on success calls command.complete_relay_sync.
• On failure calls command.fail_relay_sync.

async fn sync_relay(&self, relay: &Relay, is_new: bool)

• If is_new, sends POST /relay/:id to create the relay in zooid.
• Otherwise, sends PATCH /relay/:id to update it.
• Includes secret only for relay creation (POST) so updates do not rotate relay identity.
• Passes relay configuration in the body including host, schema, inactive flag, info, policy, groups, management, blossom, livekit, push, and roles.