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require Logger
alias Nostrum.Struct
alias Thulani.Audio.Util
defmodule Thulani.Audio.Server do
use GenServer
@type which :: String.t()
@type audio_ref :: Nostrum.Voice.play_input()
def start_link(guild_id) when is_integer(guild_id) do
GenServer.start_link(__MODULE__, guild_id,
name: {:via, Registry, {Thulani.Audio.Registry, guild_id}}
)
end
@spec play_now(Struct.Guild.id(), audio_ref, keyword()) :: which
def play_now(guild_id, channel, audio_ref, opts \\ []) do
dispatch(guild_id, {:now, {channel, audio_ref, opts}})
end
@spec enqueue(Struct.Guild.id(), audio_ref, keyword()) :: which
def enqueue(guild_id, channel, audio_ref, opts \\ []) do
dispatch(guild_id, {:enqueue, {channel, audio_ref, opts}})
end
@spec cancel(Struct.Guild.id(), which) :: GenServer.call()
def cancel(guild_id, which) do
dispatch(guild_id, {:cancel, which})
end
@spec stop(Struct.Guild.id()) :: GenServer.call()
def stop(guild_id) do
dispatch(guild_id, :stop)
end
####
@impl true
def init(guild_id) do
Nostrum.Voice.leave_channel(guild_id)
schedule_tick()
guild = Nostrum.Cache.GuildCache.get!(guild_id)
Logger.info("starting voice for guild '#{guild.name}' (#{guild_id})")
{:ok, {guild_id, :queue.new()}}
end
@impl true
def handle_call({:now, {channel, ref, opts}}, _from, {guild, q}) do
guild_ = Nostrum.Cache.GuildCache.get!(guild)
channel_ = guild_.channels[channel]
{result, q} =
with :ok <- play(guild, channel, ref, opts) do
id = UUID.uuid4()
q = :queue.in_r({id, channel, ref, opts}, q)
Logger.info(
"started playback #{id} on '#{guild_.name}'/##{channel_.name}",
guild: guild,
channel: channel,
playback: id
)
{{:ok, id}, q}
else
e -> {e, q}
end
{:reply, result, {guild, q}}
end
@impl true
def handle_call({:enqueue, {channel, audio_ref, opts}}, from, {guild, q}) do
if :queue.is_empty(q) do
# start playback immediately if queue is empty
handle_call({:now, {channel, audio_ref, opts}}, from, {guild, q})
else
id = UUID.uuid4()
q = :queue.in({id, channel, audio_ref, opts}, q)
guild_ = Nostrum.Cache.GuildCache.get!(guild)
channel_ = guild_.channels[channel]
Logger.info(
"queued playback #{id} for '#{guild_.name}'/##{channel_.name}",
guild: guild,
channel: channel,
playback: id
)
{:reply, {:ok, id}, {guild, q}}
end
end
@impl true
def handle_call({:cancel, _audio_ref}, _from, {guild, q}) do
q = :queue.delete_with(fn _elem -> false end, q)
{:reply, :ok, {guild, q}}
end
@impl true
def handle_call(:stop, _from, {guild, _q}) do
result = Nostrum.Voice.stop(guild)
{:reply, result, {guild, :queue.new()}}
end
@impl true
def handle_info(:tick, {guild, q} = state) do
state =
if Nostrum.Voice.playing?(guild) do
state
else
q =
if not :queue.is_empty(q) do
{{:value, {id, _channel, ref, opts}}, q} = :queue.out(q)
Logger.info("completed playback #{id}", id: id, ref: ref, opts: opts)
q
else
q
end
if :queue.is_empty(q) do
if not Util.disconnected?(guild) do
Logger.debug("no audio in queue, disconnecting from voice")
Util.disconnect(guild)
Logger.debug("waiting for disconnect")
if Util.wait_disconnected(guild) do
Logger.debug("disconnected")
else
Logger.debug("disconnect timed out")
end
end
else
{id, channel, ref, opts} = :queue.head(q)
Logger.debug("starting queued playback #{id}")
play(guild, channel, ref, opts)
end
{guild, q}
end
schedule_tick()
{:noreply, state}
end
###
defp tick_interval, do: 100
defp schedule_tick(interval \\ tick_interval()) when is_integer(interval) do
Process.send_after(self(), :tick, tick_interval())
end
defp play(guild, channel, ref, opts) do
{:ok, args} = play_args(ref, opts)
if Nostrum.Voice.playing?(guild) do
Nostrum.Voice.stop(guild)
end
:ok = Nostrum.Voice.join_channel(guild, channel, false, true)
if Util.wait_ready(guild) do
Logger.debug("connected")
apply(Nostrum.Voice, :play, [guild | args])
Logger.debug("waiting for playing back")
if not Util.wait_playing(guild) do
{:error, :playback_timed_out}
else
Logger.debug("playback started")
:ok
end
else
{:error, :voice_unready}
end
end
defp play_args(ref, opts) do
with {:ok, type} <- Util.stream_type(ref) do
{:ok, [ref, type, opts]}
else
{:error, _} = err ->
err
otherwise ->
dbg(otherwise)
{:error, :unknown}
end
end
defp dispatch(guild_id, args) do
ensure(guild_id)
call(guild_id, args)
end
defp call(guild_id, args), do: GenServer.call(address(guild_id), args)
defp address(guild_id), do: {:via, Registry, {Thulani.Audio.Registry, guild_id}}
defp ensure(guild_id) do
case Registry.lookup(Thulani.Audio.Registry, guild_id) do
[{pid, _}] when is_pid(pid) ->
nil
[] ->
{:ok, _} = Thulani.Audio.Supervisor.start_child(guild_id)
otherwise ->
dbg(otherwise)
end
end
end
|
