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phoenix
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Productive. Reliable. Fast. A productive web framework that does not compromise speed or maintainability.
Security advisory:
This version has known vulnerabilities.
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Files
lib/phoenix/transports/long_poller/server.ex
defmodule Phoenix.Transports.LongPoller.Supervisor do
@moduledoc false
use Supervisor
def start_link do
Supervisor.start_link(__MODULE__, [], name: __MODULE__)
end
def init([]) do
children = [
worker(Phoenix.Transports.LongPoller.Server, [], restart: :transient)
]
supervise(children, strategy: :simple_one_for_one)
end
end
defmodule Phoenix.Transports.LongPoller.Server do
use GenServer
@moduledoc false
alias Phoenix.Socket.Message
alias Phoenix.Channel.Transport
alias Phoenix.Transports.LongPoller
@doc """
Starts the Server
* `router` - The router module, ie. `MyApp.Router`
* `window_ms` - The longpoll session timeout, in milliseconds
If the server receives no message within `window_ms`, it terminates and
clients are responsible for opening a new session.
"""
def start_link(router, window_ms, priv_topic, pubsub_server) do
GenServer.start_link(__MODULE__, [router, window_ms, priv_topic, pubsub_server])
end
@doc false
def init([router, window_ms, priv_topic, pubsub_server]) do
Process.flag(:trap_exit, true)
state = %{buffer: [],
router: router,
sockets: HashDict.new,
window_ms: window_ms * 2,
pubsub_server: pubsub_server,
priv_topic: priv_topic,
client_ref: nil}
:ok = Phoenix.PubSub.subscribe(state.pubsub_server, self, state.priv_topic, link: true)
{:ok, state, state.window_ms}
end
@doc """
Stops the server
"""
def handle_call(:stop, _from, state), do: {:stop, :shutdown, :ok, state}
@doc """
Dispatches client `%Phoenix.Socket.Messages{}` back through Transport layer
"""
def handle_info({:dispatch, message, ref}, state) do
message
|> Transport.dispatch(state.sockets, self, state.router, state.pubsub_server, LongPoller)
|> case do
{:ok, sockets} ->
:ok = broadcast_from(state, {:ok, :dispatch, ref})
{:noreply, %{state | sockets: sockets}, state.window_ms}
{:error, reason, sockets} ->
:ok = broadcast_from(state, {:error, :dispatch, reason, ref})
{:noreply, %{state | sockets: sockets}, state.window_ms}
end
end
@doc """
Forwards replied/broadcasted `%Phoenix.Socket.Message{}`s from Channels back to client
"""
def handle_info({:socket_reply, message = %Message{}}, state) do
buffer = [message | state.buffer]
if state.client_ref do
:ok = broadcast_from(state, {:messages, Enum.reverse(buffer), state.client_ref})
end
{:noreply, %{state | buffer: buffer}, state.window_ms}
end
def handle_info({:socket_broadcast, message = %Message{}}, %{sockets: sockets} = state) do
sockets = case Transport.dispatch_broadcast(sockets, message) do
{:ok, socks} -> socks
{:error, _reason, socks} -> socks
end
{:noreply, %{state | sockets: sockets}, state.window_ms}
end
def handle_info({:subscribe, ref}, state) do
:ok = broadcast_from(state, {:ok, :subscribe, ref})
{:noreply, state, state.window_ms}
end
def handle_info({:flush, ref}, state) do
if Enum.any?(state.buffer) do
:ok = broadcast_from(state, {:messages, Enum.reverse(state.buffer), ref})
end
{:noreply, %{state | client_ref: ref}, state.window_ms}
end
# TODO: %Messages{}'s need unique ids so we can properly ack them
@doc """
Handles acknowledged messages from client and removes from buffer.
`:ack` calls to the server also represent the client listener
closing for repoll.
"""
def handle_info({:ack, msg_count, ref}, state) do
buffer = Enum.drop(state.buffer, -msg_count)
:ok = broadcast_from(state, {:ok, :ack, ref})
{:noreply, %{state | buffer: buffer}, state.window_ms}
end
def handle_info(:timeout, state) do
{:stop, :normal, state}
end
def handle_info({:EXIT, _pubsub_server, :shutdown}, state) do
{:stop, :pubsub_server_terminated, state}
end
@doc """
Handles forwarding arbitrary Elixir messages back to listening client
"""
def terminate(reason, state) do
:ok = Transport.dispatch_leave(state.sockets, reason)
:ok
end
defp broadcast_from(state, msg) do
Phoenix.PubSub.broadcast_from(state.pubsub_server, self, state.priv_topic, msg)
end
end