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eventstore
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Event store using PostgreSQL for persistence.
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Files
lib/event_store/subscriptions.ex
defmodule EventStore.Subscriptions do
@moduledoc """
Pub/sub for subscribers interested in events appended to either a single stream or all streams
"""
require Logger
alias EventStore.{RecordedEvent,Subscriptions}
@all_stream "$all"
def subscribe_to_stream(stream_uuid, subscription_name, subscriber, opts \\ [])
def subscribe_to_stream(stream_uuid, subscription_name, subscriber, opts) do
do_subscribe_to_stream(stream_uuid, subscription_name, subscriber, opts)
end
def subscribe_to_all_streams(subscription_name, subscriber, opts \\ [])
def subscribe_to_all_streams(subscription_name, subscriber, opts) do
do_subscribe_to_stream(@all_stream, subscription_name, subscriber, opts)
end
def unsubscribe_from_stream(stream_uuid, subscription_name) do
do_unsubscribe_from_stream(stream_uuid, subscription_name)
end
def unsubscribe_from_all_streams(subscription_name) do
do_unsubscribe_from_stream(@all_stream, subscription_name)
end
def notify_events(stream_uuid, events, serializer) do
events = Enum.map(events, &RecordedEvent.deserialize(&1, serializer))
Enum.each([
Task.async(fn -> notify_subscribers(@all_stream, events) end),
Task.async(fn -> notify_subscribers(stream_uuid, events) end),
], &Task.await(&1))
end
defp do_subscribe_to_stream(stream_uuid, subscription_name, subscriber, opts) do
_ = Logger.debug(fn -> "Creating subscription process on stream #{inspect stream_uuid} named: #{inspect subscription_name}" end)
case EventStore.Subscriptions.Supervisor.subscribe_to_stream(stream_uuid, subscription_name, subscriber, opts) do
{:ok, subscription} -> {:ok, subscription}
{:error, {:already_started, _subscription}} -> {:error, :subscription_already_exists}
end
end
defp do_unsubscribe_from_stream(stream_uuid, subscription_name) do
Subscriptions.Supervisor.unsubscribe_from_stream(stream_uuid, subscription_name)
end
defp notify_subscribers(stream_uuid, events) do
Registry.dispatch(EventStore.Subscriptions.PubSub, stream_uuid, fn subscribers ->
for {subscription, {module, function}} <- subscribers, do: apply(module, function, [subscription, events])
end)
end
end