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Event store using PostgreSQL for persistence.
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lib/event_store/streams.ex
defmodule EventStore.Streams do
@moduledoc """
Streams provides access to a stream process by its stream uuid
"""
use GenServer
require Logger
alias EventStore.Streams
defstruct streams: %{}, supervisor: nil, serializer: nil
def start_link(serializer) do
GenServer.start_link(__MODULE__, %Streams{serializer: serializer}, name: __MODULE__)
end
def open_stream(stream_uuid) do
GenServer.call(__MODULE__, {:open_stream, stream_uuid})
end
def init(%Streams{serializer: serializer} = state) do
{:ok, supervisor} = Streams.Supervisor.start_link(serializer)
state = %Streams{state | supervisor: supervisor}
{:ok, state}
end
def handle_call({:open_stream, stream_uuid}, _from, %Streams{streams: streams, supervisor: supervisor} = state) do
stream = case Map.get(streams, stream_uuid) do
nil -> start_stream(supervisor, stream_uuid)
stream -> stream
end
state = %Streams{state | streams: Map.put(streams, stream_uuid, stream)}
{:reply, {:ok, stream}, state}
end
def handle_info({:DOWN, _ref, :process, pid, reason}, %Streams{streams: streams} = state) do
Logger.warn(fn -> "stream down due to: #{inspect reason}" end)
state = %Streams{state | streams: remove_stream(streams, pid)}
{:noreply, state}
end
defp start_stream(supervisor, stream_uuid) do
{:ok, stream} = Streams.Supervisor.start_stream(supervisor, stream_uuid)
Process.monitor(stream)
stream
end
defp remove_stream(streams, pid) do
Enum.reduce(streams, streams, fn
({stream_uuid, stream_pid}, acc) when stream_pid == pid -> Map.delete(acc, stream_uuid)
(_, acc) -> acc
end)
end
end