109 lines
3.3 KiB
Elixir
109 lines
3.3 KiB
Elixir
defmodule Floof do
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@moduledoc """
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Documentation for `Floof`.
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"""
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require Logger
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def accept(port) do
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{:ok, socket} = :gen_tcp.listen(port, [
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:binary,
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packet: 4,
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active: false,
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reuseaddr: true
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])
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Logger.info("Accepting connections on #{port}")
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loop_acceptor(socket)
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end
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defp loop_acceptor(socket) do
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{:ok, client} = :gen_tcp.accept(socket)
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{:ok, pid} = Task.Supervisor.start_child(
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Floof.TaskSupervisor, fn -> serve(client, []) end)
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:ok = :gen_tcp.controlling_process(client, pid)
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# switch to active now that we handed over the client
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:inet.setopts(client, [{:active, true}])
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send(Floof.Distributor, {:register, pid})
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loop_acceptor(socket)
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end
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defp serve(client, backlog) do
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receive do
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{:tcp, _, message} ->
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{:ok, dcd} = :FloofProtocol.decode(:ProtoMessage, message)
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backlog = handle_incoming(client, backlog, dcd)
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serve(client, backlog)
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{:fwdxfer, dcdmessage} ->
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dcdid = get_xfer_id dcdmessage
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handle_outgoing(client, dcdid)
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serve(client, [{dcdid, dcdmessage} | backlog])
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{:havewe, id, res} ->
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dat = {:Summary, if res do :rejectpush else :pull end, id}
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{:ok, encd} = :FloofProtocol.encode(:ProtoMessage, {:summary, dat})
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:ok = client.send(encd)
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serve(client, backlog)
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{:SessionPushed, key} ->
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{backlog, added_ids} = extract_backlog(key, backlog, [])
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for id <- added_ids do
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dat = {:Summary, :requestpull, id}
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{:ok, encd} = :FloofProtocol.encode(:ProtoMessage, {:summary, dat})
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:ok = client.send(encd)
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end
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serve(client, backlog)
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x -> Logger.warn("unable to handle request: #{inspect(x)}")
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serve(client, backlog)
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end
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end
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defp handle_incoming(client, backlog, dcd) do
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Logger.debug("got packet #{inspect(dcd)}")
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case dcd do
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{:session, {:SessionModify, {:attach, key}}} ->
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if Floof.SessionManager.attach(key, self()) do
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send self(), {:SessionPushed, key}
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backlog
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else
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backlog
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end
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{:summary, {:Summary, direction, id}} ->
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case direction do
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:requestpull ->
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send Floof.Distributor, {:havewe, self(), id}
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backlog
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:pull ->
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case List.keytake(backlog, id, 0) do
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{{_, item}, backlog2} ->
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{:ok, encd} = :FloofProtocol.encode(:ProtoMessage, {:xfer, item})
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:ok = client.send(encd)
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backlog2
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nil -> backlog
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end
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:rejectpush ->
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List.keydelete(backlog, id, 0)
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end
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{:xfer, xf} ->
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send Floof.Distributor, xf
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backlog
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end
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end
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defp handle_outgoing(client, dcdid) do
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dat = {:Summary, :requestpull, dcdid}
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{:ok, encd} = :FloofProtocol.encode(:ProtoMessage, {:summary, dat})
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:ok = client.send(encd)
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end
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def get_xfer_id({:XferBlob, _, _, _, _, _, xfinner}) do
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{:ok, {:XferInner, id, _, _, _, _}} = :FloofProtocol.decode(:XferInner, xfinner)
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id
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end
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defp extract_backlog(key, backlog, added_ids) do
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case Floof.SessionManager.pop(key) do
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:empty -> {backlog, added_ids}
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{:value, {id, entry}} ->
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extract_backlog(key, [{id, entry} | backlog], [id | added_ids])
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end
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end
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end
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