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Event store using PostgreSQL for persistence.
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lib/event_store/streams/all_stream.ex
defmodule EventStore.Streams.AllStream do
@moduledoc """
A logical stream containing events appended to all streams
"""
require Logger
alias EventStore.{RecordedEvent,Storage}
alias EventStore.Subscriptions
def read_stream_forward(start_event_id, count) do
serializer = EventStore.configured_serializer()
read_storage_forward(start_event_id, count, serializer)
end
def stream_forward(start_event_id, read_batch_size) do
serializer = EventStore.configured_serializer()
stream_storage_forward(start_event_id, read_batch_size, serializer)
end
def subscribe_to_stream(subscription_name, subscriber, opts) do
{start_from, opts} = Keyword.pop(opts, :start_from, :origin)
opts = Keyword.merge([start_from_event_id: start_from_event_id(start_from)], opts)
Subscriptions.subscribe_to_all_streams(subscription_name, subscriber, opts)
end
defp start_from_event_id(:origin), do: 0
defp start_from_event_id(:current) do
{:ok, event_id} = Storage.latest_event_id()
event_id
end
defp start_from_event_id(start_from) when is_integer(start_from), do: start_from
defp read_storage_forward(start_event_id, count, serializer) do
case Storage.read_all_streams_forward(start_event_id, count) do
{:ok, recorded_events} -> {:ok, Enum.map(recorded_events, &RecordedEvent.deserialize(&1, serializer))}
{:error, _reason} = reply -> reply
end
end
defp stream_storage_forward(0, read_batch_size, serializer), do: stream_storage_forward(1, read_batch_size, serializer)
defp stream_storage_forward(start_event_id, read_batch_size, serializer) do
Stream.resource(
fn -> start_event_id end,
fn next_event_id ->
case read_storage_forward(next_event_id, read_batch_size, serializer) do
{:ok, []} -> {:halt, next_event_id}
{:ok, events} -> {events, next_event_id + length(events)}
{:error, _reason} -> {:halt, next_event_id}
end
end,
fn _ -> :ok end
)
end
end