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defmodule Irc.Client do
@behaviour :gen_statem
require Logger
alias Irc.Parser.Line
alias Irc.Connection
require Irc.Parser.Numeric
import Irc.Parser.Numeric
@moduledoc """
Fully-featured IRC Client.
Events emanating from the client are sent to the owner PID, `t:message/0`, and commands can be sent using `command/3`. The response is asynchronous.
If a command is sent when the client is disconnected, it will be postponed until the client is connected again.
Known IRC users are cached into `Irc.Client.UserCache`. Depending on the connection capabilities, data returned by the cache may not be up-to-date, and can be retreived with `whois/2`.
## Extending
Most of the commands and capabs are implemented in separate modules. Additional modules can be set in the start options. See `Irc.Client.Capabs`.
"""
@commands [
Irc.Client.Command.Join,
Irc.Client.Command.Who,
Irc.Client.Command.Names,
Irc.Client.Command.Away,
Irc.Client.Command.Chghost,
Irc.Client.Command.Account,
]
@internal {:next_event, :internal, nil}
defstruct [:conn, :conn_mon, :module, :modstate, :args, :nick, :modes, :info, :error, :commands, :buffer]
def callback_mode, do: [:state_enter]
@type message :: {:irc_client, pid(), event}
@type event :: event_connected | event_nick | event_modes | event_line | event_down
| Irc.Client.Command.Join.t
| Irc.Client.Command.Names.t
| Irc.Client.Command.Who.t
| Irc.Client.Command.Away.t
| Irc.Client.Command.Chghost.t
| Irc.Client.Command.AccountNotify.t
@type event_connected :: {:connected, Connection.Info.t}
@type event_nick :: {:nick, {prev_nick :: String.t, new_nick :: String.t}}
@type event_modes :: {:modes, {changes :: String.t, prev :: list, modes :: list}}
@type event_line :: {:line, line :: Irc.Parser.Line.t}
@type event_down :: {:down, {Connection.error, delay :: integer}}
@type start_opt :: Connection.start_opt
| {:module, module() | Irc.Client}
| {:commands, [module()]}
| {:conn_statem_opts, [:gen_statem.start_opt]}
@type start_ret :: {:ok, pid} | {:error, Connection.error} | :gen_statem.start_ret
@spec start(Connection.nick, Connection.host, [start_opt], [:gen_statem.start_opt]) :: start_ret
def start(nick, host, opts \\ [], start_opts \\ []) do
:gen_statem.start(__MODULE__, [nick, host, prepare_args(opts)], start_opts)
end
@spec start_link(Connection.nick, Connection.host, [start_opt], [:gen_statem.start_opt]) :: start_ret
def start_link(nick, host, opts \\ [], start_opts \\ []) do
:gen_statem.start_link(__MODULE__, [nick, host, prepare_args(opts)], start_opts)
end
def command(pid, command, args) do
ref = make_ref()
Process.send(pid, {:irc_command, command, ref, args})
ref
end
@doc "Whois an user. Depending on the connection capabilities and cache contents, a `WHOIS` irc command may not be executed; unless `cached: false`."
@type whois_opt :: {:cached, true | false}
@spec whois(pid(), String.t, Keyword.t) :: Irc.User.t()
def whois(pid, nick, opts \\ []) do
end
def call_command(pid, command, args, opts \\ []) do
timeout = Keyword.get(opts, :timeout, 10_000)
ref = command(pid, command, args)
receive do
{:irc_command, command, result} -> result
after
timeout -> {:error, :timeout}
end
end
@doc false
def init([args]) do
with \
commands <- init_commands(args),
capabs <- Enum.uniq(commands.capabs ++ Keyword.get(args, :capabs, [])),
args <- Keyword.put(args, :capabs, capabs),
{:ok, conn} <- Connection.start(Keyword.get(args, :nick), Keyword.get(args, :host), args, Keyword.get(args, :conn_statem_opts, [])),
conn_mon <- Process.monitor(conn)
do
Logger.info("Commands registered: #{inspect commands}")
data = %__MODULE__{
conn: conn, conn_mon: conn_mon,
args: args,
commands: commands
}
{:ok, :disconnected, data}
else
error -> {:stop, error}
end
end
def handle_event(:enter, :connected, :disconnected, data) do
Logger.debug "#{inspect data} disconnected: #{inspect data.error}"
:keep_state_and_data
end
def handle_event(:info, msg = {:irc_conn_up, _, info}, :disconnected, data) do
data = run_handler_event({:connected, info}, data)
{:next_state, :connected, %__MODULE__{data | nick: info.nick, info: info, modes: info.modes, error: nil}}
end
#
# --- Connected
#
def handle_event(:enter, _, :connected, data) do
Logger.debug "#{inspect data} UP"
:keep_state_and_data
end
def handle_event(:info, msg = {:irc_conn_nick, _, prev_nick, new_nick}, :connected, data) do
data = run_handler_event({:nick, prev_nick, new_nick}, data)
{:keep_state, %__MODULE__{data | nick: new_nick}}
end
def handle_event(:info, msg = {:irc_conn_modes, _, changes, prev, modes}, :connected, data) do
data = run_handler_event({:modes, changes, prev, modes}, data)
{:keep_state, %__MODULE__{data | modes: modes}}
end
def handle_event(:info, {:irc_conn_down, _, reason, delay}, :connected, data) do
data = run_handler_event({:down, reason, delay}, data)
{:next_state, :disconnected, %__MODULE__{data | error: reason}}
end
def handle_event(:info, {:irc_command, command, args}, :connected, data) do
if module = get_in(data, [:commands, :user, command]) do
{next, actions} = case module.handle_command(command, args, data.info) do
{next, next_arg} -> {{next, next_arg}, []}
{next, next_arg, actions} -> {{next, next_arg}, List.wrap(actions)}
next when is_atom(next) -> {{next, nil}, []}
end
data = handle_actions(actions, data)
case next do
{:buffer, acc} -> {:next_state, {:buffer, module}, %__MODULE__{data | buffer: acc}}
end
else
data = run_handler_event({:irc_command, command, {:error, :unsupported_command, command}}, data) # MEH?
{:keep_state, data}
end
end
# DOES NOT HANDLE ERROR (actions can just return data now)
defp handle_actions([{:send, line} | rest], data) do
case Connection.sendline(data.conn, line) do
:ok -> handle_actions(rest, data)
error -> {:next_state, :disconnected, %__MODULE__{data | error: error}}
end
data
end
defp handle_actions([{:event, event} | rest], data) do
run_handler_event(event, data)
end
defp handle_actions([], data), do: data
# TODO: REMOVE?
def handle_event(:info, {:irc_conn_line, _, line}, :connected, data) do
data = run_handler_event({:line, line}, data)
:keep_state_and_data
end
#
# --- Buffer
#
def handle_event(:info, {:irc_conn_line, _, line}, {:buffer, module}, data) do
{next, actions} = case module.handle_buffer(line, data.buffer, data.info) do
{next, next_arg} -> {{next, next_arg}, []}
{next, next_arg, actions} -> {{next, next_arg}, List.wrap(actions)}
next when is_atom(next) -> {{next, nil}, []}
end
data = handle_actions(actions, data)
case next do
{:finish, _} -> {:next_state, :connected, %__MODULE__{data | buffer: nil}}
{:buffer, acc} -> {:keep_state, %__MODULE__{data | buffer: acc}}
end
end
# TODO: Callback stop?
def handle_event(:internal, reason, :error, data) do
Logger.error "#{inspect data}: #{inspect reason}"
data.module.stop(reason, data.modstate)
{:stop, :normal}
end
def handle_event(:info, {:irc_conn_error, _, reason}, _, data) do
{:next_state, :error, data, {:next_event, :internal, reason}}
end
def handle_event(:enter, _, _, _) do
:keep_state_and_data
end
def terminate(reason, state, data) do
Logger.error("#{inspect(data)} terminating in #{inspect(state)}: #{inspect reason}")
end
def code_change(_old_vsn, old_state, old_data, _extra) do
{:ok, old_state, old_data}
end
defp prepare_args(args) do
args
end
defp run_handler_event(event, data) do
case data.module.handle_event(event, data.modstate) do
{:ok, modstate} -> %__MODULE__{data | modstate: modstate}
:ok -> data
end
end
defp init_commands(args) do
commands = @commands ++ Keyword.get(args, :commands, [])
Enum.reduce(commands, %{server: %{}, user: %{}, capabs: []}, fn(module, acc) ->
{server_commands, user_commands, capabs} = module.init()
get_value = fn(option) ->
case option do
str when is_binary(str) -> [str]
nil -> []
list when is_list(list) -> list
end
end
reduce_fun = fn(command, acc) -> Map.put(acc, command, module) end
server = Enum.reduce(List.wrap(server_commands), acc.server, reduce_fun)
user = Enum.reduce(List.wrap(user_commands), acc.user, reduce_fun)
capabs = List.concat(acc.capabs, List.wrap(capabs))
%{server: server, user: user, capabs: capabs}
end)
end
defimpl Inspect, for: __MODULE__ do
import Inspect.Algebra
def inspect(struct, _opts) do
concat(["#Irc.Client<", inspect(self()), ">"])
end
end
end
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