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eventstore
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Event store using PostgreSQL for persistence.
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lib/event_store/writer.ex
defmodule EventStore.Writer do
@moduledoc false
alias EventStore.{
Publisher,
RecordedEvent,
Storage,
}
@doc """
Append the given list of recorded events to the stream.
Returns `:ok` on success, or `{:error, reason}` on failure.
"""
@spec append_to_stream(events :: list(RecordedEvent.t), stream_id :: non_neg_integer(), stream_uuid :: String.t) :: :ok | {:error, reason :: any()}
def append_to_stream([], _stream_id, _stream_uuid), do: :ok
def append_to_stream(events, stream_id, stream_uuid) do
case Storage.append_to_stream(stream_id, events) do
{:ok, assigned_event_numbers} ->
events
|> assign_event_numbers(assigned_event_numbers)
|> publish_events(stream_uuid)
:ok
{:error, _reason} = reply -> reply
end
end
defp assign_event_numbers(events, event_numbers) do
events
|> Enum.zip(event_numbers)
|> Enum.map(fn {event, event_number} ->
%RecordedEvent{event | event_number: event_number}
end)
end
defp publish_events(events, stream_uuid),
do: Publisher.notify_events(stream_uuid, events)
end