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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
"""
use GenServer
require Logger
alias EventStore.{RecordedEvent,Storage}
alias EventStore.Streams.AllStream
alias EventStore.Subscriptions
defstruct serializer: nil
def start_link(serializer) do
GenServer.start_link(__MODULE__, %AllStream{serializer: serializer}, name: __MODULE__)
end
def read_stream_forward(start_event_id, count) do
GenServer.call(__MODULE__, {:read_stream_forward, start_event_id, count})
end
def subscribe_to_stream(subscription_name, subscriber, start_from) do
GenServer.call(__MODULE__, {:subscribe_to_stream, subscription_name, subscriber, start_from})
end
def init(%AllStream{} = state) do
{:ok, state}
end
def handle_call({:read_stream_forward, start_event_id, count}, _from, %AllStream{serializer: serializer} = state) do
reply = read_storage_forward(start_event_id, count, serializer)
{:reply, reply, state}
end
def handle_call({:subscribe_to_stream, subscription_name, subscriber, start_from}, _from, %AllStream{} = state) do
reply = Subscriptions.subscribe_to_all_streams(self, subscription_name, subscriber, start_from_event_id(start_from))
{:reply, reply, state}
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, fn event -> deserialize_recorded_event(event, serializer) end)}
{:error, _reason} = reply -> reply
end
end
defp deserialize_recorded_event(%RecordedEvent{data: data, metadata: metadata, event_type: event_type} = recorded_event, serializer) do
%RecordedEvent{recorded_event |
data: serializer.deserialize(data, type: event_type),
metadata: serializer.deserialize(metadata, [])
}
end
end