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defmodule IRC.PuppetConnection do
require Logger
@min_backoff :timer.seconds(5)
@max_backoff :timer.seconds(2*60)
@max_idle :timer.minutes(30)
defmodule Supervisor do
use DynamicSupervisor
def start_link() do
DynamicSupervisor.start_link(__MODULE__, [], name: __MODULE__)
end
def start_child(%IRC.Account{id: account_id}, %IRC.Connection{id: connection_id}) do
spec = %{id: {account_id, connection_id}, start: {IRC.PuppetConnection, :start_link, [account_id, connection_id]}, restart: :transient}
DynamicSupervisor.start_child(__MODULE__, spec)
end
@impl true
def init(_init_arg) do
DynamicSupervisor.init(
strategy: :one_for_one,
max_restarts: 10,
max_seconds: 1
)
end
end
def send_message(account = %IRC.Account{id: account_id}, connection = %IRC.Connection{id: connection_id}, channel, text) do
pid = case IRC.PuppetConnection.Supervisor.start_child(account, connection) do
{:ok, pid} -> pid
{:error, {:already_started, pid}} -> pid
end
GenServer.cast(pid, {:send_message, channel, text})
end
def start_link(account_id, connection_id) do
GenServer.start_link(__MODULE__, [account_id, connection_id], name: name(account_id, connection_id))
end
def name(account_id, connection_id) do
{:global, {PuppetConnection, account_id, connection_id}}
end
def init([account_id, connection_id]) do
account = %IRC.Account{} = IRC.Account.get(account_id)
connection = %IRC.Connection{} = IRC.Connection.lookup(connection_id)
Logger.metadata(puppet_conn: account.id <> "@" <> connection.id)
backoff = :backoff.init(@min_backoff, @max_backoff)
|> :backoff.type(:jitter)
idle = :erlang.send_after(@max_idle, self, :idle)
{:ok, %{client: nil, backoff: backoff, idle: idle, connected: false, buffer: [], channels: [], connection_id: connection_id, account_id: account_id, connected_server: nil, connected_port: nil, network: connection.network}, {:continue, :connect}}
end
def handle_continue(:connect, state) do
conn = IRC.Connection.lookup(state.connection_id)
client_opts = []
|> Keyword.put(:network, conn.network)
client = if state.client && Process.alive?(state.client) do
Logger.info("Reconnecting client")
state.client
else
Logger.info("Connecting")
{:ok, client} = ExIRC.Client.start_link(debug: false)
ExIRC.Client.add_handler(client, self())
client
end
if conn.tls do
ExIRC.Client.connect_ssl!(client, conn.host, conn.port, [])#[{:ifaddr, {45,150,150,33}}])
else
ExIRC.Client.connect!(client, conn.host, conn.port, [])#[{:ifaddr, {45,150,150,33}}])
end
{:noreply, %{state | client: client}}
end
def handle_continue(:connected, state) do
state = Enum.reduce(state.buffer, state, fn(b, state) ->
{:noreply, state} = handle_cast(b, state)
state
end)
{:noreply, %{state | buffer: []}}
end
def handle_cast(cast = {:send_message, channel, text}, state = %{connected: false, buffer: buffer}) do
{:noreply, %{state | buffer: [cast | buffer]}}
end
def handle_cast({:send_message, channel, text}, state = %{connected: true}) do
channels = if !Enum.member?(state.channels, channel) do
ExIRC.Client.join(state.client, channel)
[channel | state.channels]
else
state.channels
end
ExIRC.Client.msg(state.client, :privmsg, channel, text)
idle = if length(state.buffer) == 0 do
:erlang.cancel_timer(state.idle)
:erlang.send_after(@max_idle, self(), :idle)
else
state.idle
end
{:noreply, %{state | idle: idle, channels: channels}}
end
def handle_info(:idle, state) do
ExIRC.Client.quit(state.client, "Puppet is idle for too long")
ExIRC.Client.stop!(state.client)
{:stop, :normal, state}
end
def handle_info(:disconnected, state) do
{delay, backoff} = :backoff.fail(state.backoff)
Logger.info("#{inspect(self())} Disconnected -- reconnecting in #{inspect delay}ms")
Process.send_after(self(), :connect, delay)
{:noreply, %{state | connected: false, backoff: backoff}}
end
def handle_info(:connect, state) do
{:noreply, state, {:continue, :connect}}
end
# Connection successful
def handle_info({:connected, server, port}, state) do
Logger.info("#{inspect(self())} Connected to #{server}:#{port} #{inspect state}")
{_, backoff} = :backoff.succeed(state.backoff)
account = IRC.Account.get(state.account_id)
user = IRC.UserTrack.find_by_account(state.network, account)
base_nick = if(user, do: user.nick, else: account.name)
nick = "#{base_nick}[p]"
ExIRC.Client.logon(state.client, "", nick, base_nick, "#{base_nick}'s puppet")
{:noreply, %{state | backoff: backoff, connected_server: server, connected_port: port}}
end
# Logon successful
def handle_info(:logged_in, state) do
Logger.info("#{inspect(self())} Logged in")
{_, backoff} = :backoff.succeed(state.backoff)
{:noreply, %{state | backoff: backoff}}
end
# ISUP
def handle_info({:isup, network}, state) do
{:noreply, %{state | network: network, connected: true}, {:continue, :connected}}
end
# Been kicked
def handle_info({:kicked, _sender, chan, _reason}, state) do
{:noreply, %{state | channels: state.channels -- [chan]}}
end
def handle_info(_info, state) do
{:noreply, state}
end
end
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