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phoenix
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0.1.0
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/pubsub/gc.ex
defmodule Phoenix.PubSub.GC do
@moduledoc """
A garbage collector process that cleans up the table used
by `Phoenix.PubSub.Local`.
"""
use GenServer
@doc """
Starts the server.
* `server_name` - The name to register the server under
* `table_name` - The name of the local table
"""
def start_link(server_name, local_name) do
GenServer.start_link(__MODULE__, {server_name, local_name}, name: server_name)
end
@doc """
Force table clean up because the given pid is down asynchronously.
* `gc_server` - The registered server name or pid
* `pid` - The subscriber pid
## Examples
iex> down(:gc_server, self)
:ok
"""
def down(gc_server, pid) when is_atom(gc_server) do
GenServer.cast(gc_server, {:down, pid})
end
@doc """
Removes subscriber's subscription for topic
"""
def unsubscribe(pid, topic, topics_table, pids_table) do
true = :ets.match_delete(topics_table, {topic, {pid, :_}})
true = :ets.delete_object(pids_table, {pid, topic})
:ok
end
def init({server_name, local_name}) do
{:ok, %{topics: local_name, pids: server_name}}
end
def handle_call({:subscription, pid}, _from, state) do
try do
{:reply, :ets.lookup_element(state.pids, pid, 2), state}
catch
:error, :badarg -> {:reply, [], state}
end
end
def handle_cast({:down, pid}, state) do
try do
topics = :ets.lookup_element(state.pids, pid, 2)
for topic <- topics do
true = :ets.match_delete(state.topics, {topic, {pid, :_}})
end
true = :ets.match_delete(state.pids, {pid, :_})
catch
:error, :badarg -> :badarg
end
{:noreply, state}
end
end