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worker.ex
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worker.ex
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defmodule Express.APNS.Worker do
use GenServer
alias Express.Operations.LogMessage
alias Express.APNS.JWTHolder
alias Express.Network.HTTP2
alias Express.APNS.PushMessage
alias Express.Operations.APNS.Push
alias Express.APNS.Connection, as: APNSConnection
require Logger
defmodule State do
@type t :: %__MODULE__{
connection: HTTP2.Connection.t,
push_message: PushMessage.t,
callback_fun: Express.callback_fun,
async: boolean(),
stop_at: pos_integer()
}
defstruct ~w(connection push_message callback_fun async stop_at)a
end
def start_link(opts \\ []), do: GenServer.start_link(__MODULE__, {:ok, opts})
def init({:ok, opts}) do
connection = APNSConnection.new()
if connection do
{:ok, %State{connection: connection,
async: (opts[:async] in ["true", true]),
stop_at: shift_timer()}}
else
{:stop, :no_connection}
end
end
def push(worker, push_message, opts, callback_fun) do
GenServer.call(worker, {:push, push_message, opts, callback_fun}, 3000)
end
def handle_call({:push, push_message, _opts, callback_fun}, _from, %{async: true} = state) do
if state.stop_at && state.stop_at <= Timex.to_unix(Timex.now()) do
{:stop, :normal, {:error, :connection_down}, state}
else
if Process.alive?(state.connection.socket) do
push_message
|> push_params(state)
|> Push.run!()
new_state =
state
|> Map.put(:push_message, push_message)
|> Map.put(:callback_fun, callback_fun)
{:reply, :pushed, new_state}
else
{:stop, :normal, {:error, :connection_down}, state}
end
end
end
def handle_call({:push, push_message, _opts, callback_fun}, _from, %{async: false} = state) do
if state.stop_at && state.stop_at <= Timex.to_unix(Timex.now()) do
{:stop, :normal, {:error, :connection_down}, state}
else
if Process.alive?(state.connection.socket) do
{headers, body} =
push_message
|> push_params(state)
|> Push.run!()
new_state =
state
|> Map.put(:stop_at, shift_timer())
|> Map.put(:push_message, push_message)
result = handle_response({headers, body}, new_state, callback_fun)
{:reply, {:ok, result}, new_state}
else
{:stop, :normal, {:error, :connection_down}, state}
end
end
end
def handle_info({:END_STREAM, stream},
%{connection: connection,
callback_fun: callback_fun} = state)
do
{:ok, {headers, body}} = HTTP2.get_response(connection, stream)
handle_response({headers, body}, state, callback_fun)
new_state = Map.put(state, :stop_at, shift_timer())
{:noreply, new_state}
end
def handle_info(:timeout, state), do: {:stop, :normal, {:error, :timeout}, state}
def handle_info(_, state), do: {:noreply, state}
@spec push_params(PushMessage.t, State.t) :: Keyword.t
defp push_params(push_message, %{connection: connection, async: async}) when is_map(connection) do
if is_map(connection.ssl_config) do
[
push_message: push_message,
connection: connection,
async: async
]
else
[
push_message: push_message,
connection: connection,
jwt: JWTHolder.get_jwt(),
async: async
]
end
end
@spec handle_response({list(), String.t}, State.t, Express.callback_fun) :: any()
defp handle_response({headers, body} = _response,
%{push_message: push_message} = _state,
callback_fun)
do
headers_map = Enum.reduce(headers, %{}, fn({k, v}, m) -> Map.put(m, k, v) end)
status = fetch_status(headers_map)
apns_id = fetch_apns_id(headers_map)
result =
case status do
200 ->
{:ok, %{id: apns_id, status: status, body: body}}
status ->
error_reason = fetch_reason(body)
log_error({status, error_reason}, push_message)
{:error, %{id: apns_id, status: status, body: body}}
end
if is_function(callback_fun) do
callback_fun.(push_message, result)
end
result
end
defp handle_response(_, _, _), do: :nothing
@spec fetch_status(Map.t) :: pos_integer() | nil
defp fetch_status(%{":status" => status}), do: String.to_integer(status)
defp fetch_status(_), do: nil
@spec fetch_apns_id(Map.t) :: String.t | nil
defp fetch_apns_id(%{"apns-id" => apns_id}), do: apns_id
defp fetch_apns_id(_), do: nil
@spec fetch_reason(String.t) :: String.t
defp fetch_reason(nil), do: nil
defp fetch_reason(""), do: ""
defp fetch_reason([]), do: ""
defp fetch_reason([body]), do: fetch_reason(body)
defp fetch_reason(body) do
{:ok, body} = Poison.decode(body)
Macro.underscore(body["reason"])
end
@spec log_error({String.t, String.t}, PushMessage.t) :: :ok | {:error, any()}
defp log_error({status, reason}, push_message) do
error_message = """
[APNS worker] APNS: #{inspect(reason)}[#{status}]\n#{inspect(push_message)}
"""
LogMessage.run!(message: error_message, type: :warn)
end
@spec shift_timer() :: pos_integer()
defp shift_timer do
Timex.now() |> Timex.shift(seconds: 10) |> Timex.to_unix()
end
end