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Resonate Channel Meter

A Laravel package that records billable and observable channel occupancy periods from webpatser/resonate-webhooks events. It turns "this room was occupied for 12 minutes" from a polling problem into a Pusher webhook your backend just reacts to.

It is a webhook consumer, not a Resonate plugin. It runs in your Laravel app.

Where it fits

The roster makes occupancy cluster-correct. The webhooks plugin pushes the edges out as signed HTTP POSTs. This package receives them and stores them as durable periods you can query and bill on.

How it works

One period per occupancy

A channel_occupied event opens a channel_meter_periods row with started_at = time_ms and ended_at = null. The matching channel_vacated closes it. Both are idempotent: a redelivered webhook never duplicates a period or leaves an orphan close.

Channel to model resolution

The channel_meter_periods table carries a polymorphic model_type / model_id. A small resolver maps a channel name to the domain entity it represents, using a {id} placeholder:

presence-chat.42 resolves to (Chat::class, '42'), and the period is stored with that link. A channel that matches no pattern is still recorded with the channel name; it just has no model attached. Swap the default ConfigChannelResolver for your own by binding ChannelResolver::class in a service provider if you need richer rules (tenants, composite keys, lookups).

Models pull their own periods

Apply the HasChannelMeter trait to any model the resolver maps to:

You get:

Installation

The package migration is auto-loaded. Run it:

Publish the config to register channel patterns:

Registering the webhook endpoint

The package does not auto-register a route, so you mount the controller wherever you want, behind the signature middleware:

Then point the webhooks plugin at that URL:

The middleware verifies the X-Pusher-Signature against the app secret in reverb.apps, so an unsigned or forged request is rejected with 401. An unknown X-Pusher-Key is rejected with 422.

Fully-occupied metering (min members + grace)

By default a period spans plain room occupancy: channel_occupied opens it, channel_vacated closes it. Set min_members to 2 (or more) to meter only while the channel is fully occupied, for example billing a two-party reading only while both the customer and the consultant are present.

In this mode every membership event re-evaluates the live member count, so the package needs a way to read it. Bind a MembershipCounter; the shipped NullMembershipCounter always returns 0, so a host that uses webpatser/resonate-roster typically binds a small adapter over its roster:

grace_seconds keeps the period open for a window after the count drops below the threshold, closing it at dropped-below + grace only if the count does not recover (it absorbs brief reconnects). Because a channel can simply go quiet after dropping below, schedule the backstop sweep:

For a live in-progress meter, read the open period plus the metadata.below_since marker yourself and cap billable time at below_since + grace; the sweep then persists the same close durably.

Configuration reference

Notes and caveats

• Room mode processes only occupancy events. With min_members <= 1 the handler records channel_occupied / channel_vacated; member and client events are ignored. Fully-occupied mode additionally consumes member_added / member_removed to re-evaluate the count.
• Idempotent. Receiving the same webhook twice never duplicates a period.
• One open period per channel, enforced by the database. A unique index on (app_id, channel, open_slot) allows any number of closed periods but only one open one, so concurrent or retried deliveries cannot leave a second period open. open_slot is bookkeeping (1 while open, null once closed); the model keeps it in step with ended_at.
• Events older than the newest one applied are dropped. Each channel carries a last_event_ms high-water mark, so a redelivered channel_occupied arriving after its channel_vacated is ignored rather than opening a phantom period. ended_at is also clamped so it can never precede started_at.
• time_ms comes from the server. The started_at and ended_at timestamps are taken from the webhook envelope's time_ms, not the receiver's local clock, so a queued retry still records the original moment.
• Open periods are excluded from totals. totalChannelMeterSeconds() ignores any period whose ended_at is still null. Close stale periods explicitly if you need to bill an in-progress session.

Requirements

• PHP 8.5+
• Laravel 13
• webpatser/resonate-webhooks running against a Resonate server

Testing

License

MIT. See LICENSE.