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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 false
alias EventStore.{Storage, Subscriptions}
alias EventStore.Subscriptions.Subscription
def subscribe_to_stream(subscriber, opts \\ []) do
case Subscriptions.Supervisor.start_subscription(opts) do
{:ok, subscription} ->
Subscription.connect(subscription, subscriber, opts)
{:error, {:already_started, subscription}} ->
case Keyword.get(opts, :concurrency_limit) do
nil ->
{:error, :subscription_already_exists}
concurrency_limit when is_number(concurrency_limit) ->
Subscription.connect(subscription, subscriber, opts)
end
end
end
def unsubscribe_from_stream(event_store, stream_uuid, subscription_name) do
Subscriptions.Supervisor.unsubscribe_from_stream(event_store, stream_uuid, subscription_name)
end
def delete_subscription(event_store, stream_uuid, subscription_name, opts \\ []) do
:ok =
Subscriptions.Supervisor.shutdown_subscription(event_store, stream_uuid, subscription_name)
conn = Module.concat(event_store, EventStore.Postgrex)
Storage.delete_subscription(conn, stream_uuid, subscription_name, opts)
end
@doc """
Get the delay between subscription retry attempts, in milliseconds, from the
event store config.
The default value is one minute and the minimum allowed value is one second.
"""
def retry_interval(event_store, config) do
case Keyword.get(config, :subscription_retry_interval) do
interval when is_integer(interval) and interval > 0 ->
# Ensure interval is no less than one second
max(interval, 1_000)
nil ->
# Default to 60 seconds when not configured
60_000
invalid ->
raise ArgumentError,
message:
"Invalid `:subscription_retry_interval` setting in " <>
inspect(event_store) <>
" config. Expected an integer in milliseconds but got: " <> inspect(invalid)
end
end
end