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client.py
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client.py
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import logging
from concurrent.futures.thread import ThreadPoolExecutor
from logging import Logger
from queue import Queue
from threading import Lock
from typing import Union, Optional, List, Callable
from slack_sdk.socket_mode.client import BaseSocketModeClient
from slack_sdk.socket_mode.listeners import (
WebSocketMessageListener,
SocketModeRequestListener,
)
from slack_sdk.socket_mode.request import SocketModeRequest
from slack_sdk.web import WebClient
from .connection import Connection, ConnectionState
from ..interval_runner import IntervalRunner
from ...errors import SlackClientConfigurationError
class SocketModeClient(BaseSocketModeClient):
logger: Logger
web_client: WebClient
app_token: str
wss_uri: Optional[str]
message_queue: Queue
message_listeners: List[
Union[
WebSocketMessageListener,
Callable[["BaseSocketModeClient", dict, Optional[str]], None],
]
]
socket_mode_request_listeners: List[
Union[
SocketModeRequestListener,
Callable[["BaseSocketModeClient", SocketModeRequest], None],
]
]
current_session: Optional[Connection]
current_session_state: ConnectionState
current_session_runner: IntervalRunner
current_app_monitor: IntervalRunner
current_app_monitor_started: bool
message_processor: IntervalRunner
message_workers: ThreadPoolExecutor
auto_reconnect_enabled: bool
default_auto_reconnect_enabled: bool
trace_enabled: bool
receive_buffer_size: int # bytes size
connect_operation_lock: Lock
on_message_listeners: List[Callable[[str], None]]
on_error_listeners: List[Callable[[Exception], None]]
on_close_listeners: List[Callable[[int, Optional[str]], None]]
def __init__(
self,
app_token: str,
logger: Optional[Logger] = None,
web_client: Optional[WebClient] = None,
auto_reconnect_enabled: bool = True,
trace_enabled: bool = False,
all_message_trace_enabled: bool = False,
ping_pong_trace_enabled: bool = False,
ping_interval: float = 10,
receive_buffer_size: int = 1024,
concurrency: int = 10,
proxy: Optional[str] = None,
on_message_listeners: Optional[List[Callable[[str], None]]] = None,
on_error_listeners: Optional[List[Callable[[Exception], None]]] = None,
on_close_listeners: Optional[List[Callable[[int, Optional[str]], None]]] = None,
):
self.app_token = app_token
self.logger = logger or logging.getLogger(__name__)
self.web_client = web_client or WebClient()
self.default_auto_reconnect_enabled = auto_reconnect_enabled
self.auto_reconnect_enabled = self.default_auto_reconnect_enabled
self.trace_enabled = trace_enabled
self.all_message_trace_enabled = all_message_trace_enabled
self.ping_pong_trace_enabled = ping_pong_trace_enabled
self.ping_interval = ping_interval
self.receive_buffer_size = receive_buffer_size
if self.receive_buffer_size < 16:
raise SlackClientConfigurationError(
"Too small receive_buffer_size detected."
)
self.wss_uri = None
self.message_queue = Queue()
self.message_listeners = []
self.socket_mode_request_listeners = []
self.current_session = None
self.current_session_state = ConnectionState()
self.current_session_runner = IntervalRunner(
self._run_current_session, 0.5
).start()
self.current_app_monitor_started = False
self.current_app_monitor = IntervalRunner(
self._monitor_current_session, self.ping_interval
)
self.closed = False
self.connect_operation_lock = Lock()
self.message_processor = IntervalRunner(self.process_messages, 0.001).start()
self.message_workers = ThreadPoolExecutor(max_workers=concurrency)
self.proxy = proxy
self.on_message_listeners = on_message_listeners or []
self.on_error_listeners = on_error_listeners or []
self.on_close_listeners = on_close_listeners or []
def session_id(self) -> Optional[str]:
if self.current_session is not None:
return self.current_session.session_id
return None
def is_connected(self) -> bool:
return self.current_session is not None and self.current_session.is_active()
def connect(self) -> None:
old_session: Optional[Connection] = self.current_session
if self.wss_uri is None:
self.wss_uri = self.issue_new_wss_url()
self.current_session = Connection(
url=self.wss_uri,
logger=self.logger,
ping_interval=self.ping_interval,
trace_enabled=self.trace_enabled,
all_message_trace_enabled=self.all_message_trace_enabled,
ping_pong_trace_enabled=self.ping_pong_trace_enabled,
receive_buffer_size=self.receive_buffer_size,
proxy=self.proxy,
on_message_listener=self._on_message,
on_error_listener=self._on_error,
on_close_listener=self._on_close,
)
self.current_session.connect()
self.auto_reconnect_enabled = self.default_auto_reconnect_enabled
if old_session is not None:
old_session.close()
self.current_session_state.terminated = True
if not self.current_app_monitor_started:
self.current_app_monitor_started = True
self.current_app_monitor.start()
self.logger.info(
f"A new session has been established (session id: {self.session_id()})"
)
def disconnect(self) -> None:
if self.current_session is not None:
self.current_session.close()
def send_message(self, message: str) -> None:
if self.logger.level <= logging.DEBUG:
self.logger.debug(
f"Sending a message (session id: {self.session_id()}, message: {message})"
)
self.current_session.send(message)
def close(self):
self.closed = True
self.auto_reconnect_enabled = False
self.disconnect()
if self.current_app_monitor.is_alive():
self.current_app_monitor.shutdown()
if self.message_processor.is_alive():
self.message_processor.shutdown()
self.message_workers.shutdown()
def _on_message(self, message: str):
if self.logger.level <= logging.DEBUG:
self.logger.debug(f"on_message invoked: (message: {message})")
self.enqueue_message(message)
for listener in self.on_message_listeners:
listener(message)
def _on_error(self, error: Exception):
self.logger.exception(
f"on_error invoked (session id: {self.session_id()}, "
f"error: {type(error).__name__}, message: {error})"
)
for listener in self.on_error_listeners:
listener(error)
def _on_close(self, code: int, reason: Optional[str] = None):
if self.logger.level <= logging.DEBUG:
self.logger.debug(f"on_close invoked (session id: {self.session_id()})")
if self.auto_reconnect_enabled:
self.logger.info(
"Received CLOSE event. Going to reconnect... "
f"(session id: {self.session_id()})"
)
self.connect_to_new_endpoint()
for listener in self.on_close_listeners:
listener(code, reason)
def _run_current_session(self):
try:
if self.current_session is not None and self.current_session.is_active():
self.logger.info(
"Starting to receive messages from a new connection"
f" (session id: {self.session_id()})"
)
self.current_session_state.terminated = False
self.current_session.run_until_completion(self.current_session_state)
self.logger.info(
"Stopped receiving messages from a connection"
f" (session id: {self.session_id()})"
)
except Exception as e:
self.logger.exception(
"Failed to start or stop the current session"
f" (session id: {self.session_id()}, error: {e})"
)
def _monitor_current_session(self):
if self.current_app_monitor_started:
try:
self.current_session.check_state()
if self.auto_reconnect_enabled and (
self.current_session is None or not self.current_session.is_active()
):
self.logger.info(
"The session seems to be already closed. Going to reconnect... "
f"(session id: {self.session_id()})"
)
self.connect_to_new_endpoint()
except Exception as e:
self.logger.error(
"Failed to check the current session or reconnect to the server "
f"(session id: {self.session_id()}, error: {type(e).__name__}, message: {e})"
)