Module slack_sdk.socket_mode.websockets
websockets bassd Socket Mode client
- https://api.slack.com/apis/connections/socket
- https://slack.dev/python-slack-sdk/socket-mode/
- https://pypi.org/project/websockets/
Expand source code
"""websockets bassd Socket Mode client
* https://api.slack.com/apis/connections/socket
* https://slack.dev/python-slack-sdk/socket-mode/
* https://pypi.org/project/websockets/
"""
import asyncio
import logging
from asyncio import Future, Lock
from logging import Logger
from asyncio import Queue
from typing import Union, Optional, List, Callable, Awaitable
import websockets
from websockets.exceptions import WebSocketException
# To keep compatibility with websockets 8.x, we use this import over .legacy.client
from websockets import WebSocketClientProtocol
from slack_sdk.socket_mode.async_client import AsyncBaseSocketModeClient
from slack_sdk.socket_mode.async_listeners import (
AsyncWebSocketMessageListener,
AsyncSocketModeRequestListener,
)
from slack_sdk.socket_mode.request import SocketModeRequest
from slack_sdk.web.async_client import AsyncWebClient
class SocketModeClient(AsyncBaseSocketModeClient):
logger: Logger
web_client: AsyncWebClient
app_token: str
wss_uri: Optional[str]
auto_reconnect_enabled: bool
message_queue: Queue
message_listeners: List[
Union[
AsyncWebSocketMessageListener,
Callable[["AsyncBaseSocketModeClient", dict, Optional[str]], Awaitable[None]],
]
]
socket_mode_request_listeners: List[
Union[
AsyncSocketModeRequestListener,
Callable[["AsyncBaseSocketModeClient", SocketModeRequest], Awaitable[None]],
]
]
message_receiver: Optional[Future]
message_processor: Future
ping_interval: float
trace_enabled: bool
current_session: Optional[WebSocketClientProtocol]
current_session_monitor: Optional[Future]
auto_reconnect_enabled: bool
default_auto_reconnect_enabled: bool
closed: bool
connect_operation_lock: Lock
def __init__(
self,
app_token: str,
logger: Optional[Logger] = None,
web_client: Optional[AsyncWebClient] = None,
auto_reconnect_enabled: bool = True,
ping_interval: float = 10,
trace_enabled: bool = False,
):
"""Socket Mode client
Args:
app_token: App-level token
logger: Custom logger
web_client: Web API client
auto_reconnect_enabled: True if automatic reconnection is enabled (default: True)
ping_interval: interval for ping-pong with Slack servers (seconds)
trace_enabled: True if more verbose logs to see what's happening under the hood
"""
self.app_token = app_token
self.logger = logger or logging.getLogger(__name__)
self.web_client = web_client or AsyncWebClient()
self.closed = False
self.connect_operation_lock = Lock()
self.default_auto_reconnect_enabled = auto_reconnect_enabled
self.auto_reconnect_enabled = self.default_auto_reconnect_enabled
self.ping_interval = ping_interval
self.trace_enabled = trace_enabled
self.wss_uri = None
self.message_queue = Queue()
self.message_listeners = []
self.socket_mode_request_listeners = []
self.current_session = None
self.current_session_monitor = None
self.message_receiver = None
self.message_processor = asyncio.ensure_future(self.process_messages())
async def monitor_current_session(self) -> None:
# In the asyncio runtime, accessing a shared object (self.current_session here) from
# multiple tasks can cause race conditions and errors.
# To avoid such, we access only the session that is active when this loop starts.
session: WebSocketClientProtocol = self.current_session
session_id: str = await self.session_id()
if self.logger.level <= logging.DEBUG:
self.logger.debug(f"A new monitor_current_session() execution loop for {session_id} started")
try:
while not self.closed:
if session != self.current_session:
if self.logger.level <= logging.DEBUG:
self.logger.debug(f"The monitor_current_session task for {session_id} is now cancelled")
break
await asyncio.sleep(self.ping_interval)
try:
if self.auto_reconnect_enabled and (session is None or session.closed):
self.logger.info(f"The session ({session_id}) seems to be already closed. Reconnecting...")
await self.connect_to_new_endpoint()
except Exception as e:
self.logger.error(
"Failed to check the current session or reconnect to the server "
f"(error: {type(e).__name__}, message: {e}, session: {session_id})"
)
except asyncio.CancelledError:
if self.logger.level <= logging.DEBUG:
self.logger.debug(f"The monitor_current_session task for {session_id} is now cancelled")
raise
async def receive_messages(self) -> None:
# In the asyncio runtime, accessing a shared object (self.current_session here) from
# multiple tasks can cause race conditions and errors.
# To avoid such, we access only the session that is active when this loop starts.
session: WebSocketClientProtocol = self.current_session
session_id: str = await self.session_id()
consecutive_error_count = 0
if self.logger.level <= logging.DEBUG:
self.logger.debug(f"A new receive_messages() execution loop with {session_id} started")
try:
while not self.closed:
if session != self.current_session:
if self.logger.level <= logging.DEBUG:
self.logger.debug(f"The running receive_messages task for {session_id} is now cancelled")
break
try:
message = await session.recv()
if message is not None:
if isinstance(message, bytes):
message = message.decode("utf-8")
if self.logger.level <= logging.DEBUG:
self.logger.debug(f"Received message: {message}, session: {session_id}")
await self.enqueue_message(message)
consecutive_error_count = 0
except Exception as e:
consecutive_error_count += 1
self.logger.error(
f"Failed to receive or enqueue a message: {type(e).__name__}, error: {e}, session: {session_id}"
)
if isinstance(e, websockets.ConnectionClosedError):
await asyncio.sleep(self.ping_interval)
else:
await asyncio.sleep(consecutive_error_count)
except asyncio.CancelledError:
if self.logger.level <= logging.DEBUG:
self.logger.debug(f"The running receive_messages task for {session_id} is now cancelled")
raise
async def is_connected(self) -> bool:
return not self.closed and self.current_session is not None and not self.current_session.closed
async def session_id(self) -> str:
return self.build_session_id(self.current_session)
async def connect(self):
if self.wss_uri is None:
self.wss_uri = await self.issue_new_wss_url()
old_session: Optional[WebSocketClientProtocol] = None if self.current_session is None else self.current_session
# NOTE: websockets does not support proxy settings
self.current_session = await websockets.connect(
uri=self.wss_uri,
ping_interval=self.ping_interval,
)
session_id = await self.session_id()
self.auto_reconnect_enabled = self.default_auto_reconnect_enabled
self.logger.info(f"A new session ({session_id}) has been established")
if self.current_session_monitor is not None:
self.current_session_monitor.cancel()
self.current_session_monitor = asyncio.ensure_future(self.monitor_current_session())
if self.logger.level <= logging.DEBUG:
self.logger.debug(f"A new monitor_current_session() executor has been recreated for {session_id}")
if self.message_receiver is not None:
self.message_receiver.cancel()
self.message_receiver = asyncio.ensure_future(self.receive_messages())
if self.logger.level <= logging.DEBUG:
self.logger.debug(f"A new receive_messages() executor has been recreated for {session_id}")
if old_session is not None:
await old_session.close()
old_session_id = self.build_session_id(old_session)
self.logger.info(f"The old session ({old_session_id}) has been abandoned")
async def disconnect(self):
if self.current_session is not None:
await self.current_session.close()
async def send_message(self, message: str):
session = self.current_session
session_id = self.build_session_id(session)
if self.logger.level <= logging.DEBUG:
self.logger.debug(f"Sending a message: {message}, session: {session_id}")
try:
await session.send(message)
except WebSocketException as e:
# We rarely get this exception while replacing the underlying WebSocket connections.
# We can do one more try here as the self.current_session should be ready now.
if self.logger.level <= logging.DEBUG:
self.logger.debug(
f"Failed to send a message (error: {e}, message: {message}, session: {session_id})"
" as the underlying connection was replaced. Retrying the same request only one time..."
)
# Although acquiring self.connect_operation_lock also for the first method call is the safest way,
# we avoid synchronizing a lot for better performance. That's why we are doing a retry here.
try:
if await self.is_connected():
await self.current_session.send(message)
else:
self.logger.warning(f"The current session ({session_id}) is no longer active. Failed to send a message")
raise e
finally:
if self.connect_operation_lock.locked() is True:
self.connect_operation_lock.release()
async def close(self):
self.closed = True
self.auto_reconnect_enabled = False
await self.disconnect()
self.message_processor.cancel()
if self.current_session_monitor is not None:
self.current_session_monitor.cancel()
if self.message_receiver is not None:
self.message_receiver.cancel()
@classmethod
def build_session_id(cls, session: WebSocketClientProtocol) -> str:
if session is None:
return ""
return "s_" + str(hash(session))
Classes
class SocketModeClient (app_token: str, logger: Optional[logging.Logger] = None, web_client: Optional[AsyncWebClient] = None, auto_reconnect_enabled: bool = True, ping_interval: float = 10, trace_enabled: bool = False)
-
Socket Mode client
Args
app_token
- App-level token
logger
- Custom logger
web_client
- Web API client
auto_reconnect_enabled
- True if automatic reconnection is enabled (default: True)
ping_interval
- interval for ping-pong with Slack servers (seconds)
trace_enabled
- True if more verbose logs to see what's happening under the hood
Expand source code
class SocketModeClient(AsyncBaseSocketModeClient): logger: Logger web_client: AsyncWebClient app_token: str wss_uri: Optional[str] auto_reconnect_enabled: bool message_queue: Queue message_listeners: List[ Union[ AsyncWebSocketMessageListener, Callable[["AsyncBaseSocketModeClient", dict, Optional[str]], Awaitable[None]], ] ] socket_mode_request_listeners: List[ Union[ AsyncSocketModeRequestListener, Callable[["AsyncBaseSocketModeClient", SocketModeRequest], Awaitable[None]], ] ] message_receiver: Optional[Future] message_processor: Future ping_interval: float trace_enabled: bool current_session: Optional[WebSocketClientProtocol] current_session_monitor: Optional[Future] auto_reconnect_enabled: bool default_auto_reconnect_enabled: bool closed: bool connect_operation_lock: Lock def __init__( self, app_token: str, logger: Optional[Logger] = None, web_client: Optional[AsyncWebClient] = None, auto_reconnect_enabled: bool = True, ping_interval: float = 10, trace_enabled: bool = False, ): """Socket Mode client Args: app_token: App-level token logger: Custom logger web_client: Web API client auto_reconnect_enabled: True if automatic reconnection is enabled (default: True) ping_interval: interval for ping-pong with Slack servers (seconds) trace_enabled: True if more verbose logs to see what's happening under the hood """ self.app_token = app_token self.logger = logger or logging.getLogger(__name__) self.web_client = web_client or AsyncWebClient() self.closed = False self.connect_operation_lock = Lock() self.default_auto_reconnect_enabled = auto_reconnect_enabled self.auto_reconnect_enabled = self.default_auto_reconnect_enabled self.ping_interval = ping_interval self.trace_enabled = trace_enabled self.wss_uri = None self.message_queue = Queue() self.message_listeners = [] self.socket_mode_request_listeners = [] self.current_session = None self.current_session_monitor = None self.message_receiver = None self.message_processor = asyncio.ensure_future(self.process_messages()) async def monitor_current_session(self) -> None: # In the asyncio runtime, accessing a shared object (self.current_session here) from # multiple tasks can cause race conditions and errors. # To avoid such, we access only the session that is active when this loop starts. session: WebSocketClientProtocol = self.current_session session_id: str = await self.session_id() if self.logger.level <= logging.DEBUG: self.logger.debug(f"A new monitor_current_session() execution loop for {session_id} started") try: while not self.closed: if session != self.current_session: if self.logger.level <= logging.DEBUG: self.logger.debug(f"The monitor_current_session task for {session_id} is now cancelled") break await asyncio.sleep(self.ping_interval) try: if self.auto_reconnect_enabled and (session is None or session.closed): self.logger.info(f"The session ({session_id}) seems to be already closed. Reconnecting...") await self.connect_to_new_endpoint() except Exception as e: self.logger.error( "Failed to check the current session or reconnect to the server " f"(error: {type(e).__name__}, message: {e}, session: {session_id})" ) except asyncio.CancelledError: if self.logger.level <= logging.DEBUG: self.logger.debug(f"The monitor_current_session task for {session_id} is now cancelled") raise async def receive_messages(self) -> None: # In the asyncio runtime, accessing a shared object (self.current_session here) from # multiple tasks can cause race conditions and errors. # To avoid such, we access only the session that is active when this loop starts. session: WebSocketClientProtocol = self.current_session session_id: str = await self.session_id() consecutive_error_count = 0 if self.logger.level <= logging.DEBUG: self.logger.debug(f"A new receive_messages() execution loop with {session_id} started") try: while not self.closed: if session != self.current_session: if self.logger.level <= logging.DEBUG: self.logger.debug(f"The running receive_messages task for {session_id} is now cancelled") break try: message = await session.recv() if message is not None: if isinstance(message, bytes): message = message.decode("utf-8") if self.logger.level <= logging.DEBUG: self.logger.debug(f"Received message: {message}, session: {session_id}") await self.enqueue_message(message) consecutive_error_count = 0 except Exception as e: consecutive_error_count += 1 self.logger.error( f"Failed to receive or enqueue a message: {type(e).__name__}, error: {e}, session: {session_id}" ) if isinstance(e, websockets.ConnectionClosedError): await asyncio.sleep(self.ping_interval) else: await asyncio.sleep(consecutive_error_count) except asyncio.CancelledError: if self.logger.level <= logging.DEBUG: self.logger.debug(f"The running receive_messages task for {session_id} is now cancelled") raise async def is_connected(self) -> bool: return not self.closed and self.current_session is not None and not self.current_session.closed async def session_id(self) -> str: return self.build_session_id(self.current_session) async def connect(self): if self.wss_uri is None: self.wss_uri = await self.issue_new_wss_url() old_session: Optional[WebSocketClientProtocol] = None if self.current_session is None else self.current_session # NOTE: websockets does not support proxy settings self.current_session = await websockets.connect( uri=self.wss_uri, ping_interval=self.ping_interval, ) session_id = await self.session_id() self.auto_reconnect_enabled = self.default_auto_reconnect_enabled self.logger.info(f"A new session ({session_id}) has been established") if self.current_session_monitor is not None: self.current_session_monitor.cancel() self.current_session_monitor = asyncio.ensure_future(self.monitor_current_session()) if self.logger.level <= logging.DEBUG: self.logger.debug(f"A new monitor_current_session() executor has been recreated for {session_id}") if self.message_receiver is not None: self.message_receiver.cancel() self.message_receiver = asyncio.ensure_future(self.receive_messages()) if self.logger.level <= logging.DEBUG: self.logger.debug(f"A new receive_messages() executor has been recreated for {session_id}") if old_session is not None: await old_session.close() old_session_id = self.build_session_id(old_session) self.logger.info(f"The old session ({old_session_id}) has been abandoned") async def disconnect(self): if self.current_session is not None: await self.current_session.close() async def send_message(self, message: str): session = self.current_session session_id = self.build_session_id(session) if self.logger.level <= logging.DEBUG: self.logger.debug(f"Sending a message: {message}, session: {session_id}") try: await session.send(message) except WebSocketException as e: # We rarely get this exception while replacing the underlying WebSocket connections. # We can do one more try here as the self.current_session should be ready now. if self.logger.level <= logging.DEBUG: self.logger.debug( f"Failed to send a message (error: {e}, message: {message}, session: {session_id})" " as the underlying connection was replaced. Retrying the same request only one time..." ) # Although acquiring self.connect_operation_lock also for the first method call is the safest way, # we avoid synchronizing a lot for better performance. That's why we are doing a retry here. try: if await self.is_connected(): await self.current_session.send(message) else: self.logger.warning(f"The current session ({session_id}) is no longer active. Failed to send a message") raise e finally: if self.connect_operation_lock.locked() is True: self.connect_operation_lock.release() async def close(self): self.closed = True self.auto_reconnect_enabled = False await self.disconnect() self.message_processor.cancel() if self.current_session_monitor is not None: self.current_session_monitor.cancel() if self.message_receiver is not None: self.message_receiver.cancel() @classmethod def build_session_id(cls, session: WebSocketClientProtocol) -> str: if session is None: return "" return "s_" + str(hash(session))
Ancestors
Class variables
var app_token : str
var auto_reconnect_enabled : bool
var closed : bool
var connect_operation_lock : asyncio.locks.Lock
var current_session : Optional[websockets.legacy.client.WebSocketClientProtocol]
var current_session_monitor : Optional[_asyncio.Future]
var default_auto_reconnect_enabled : bool
var logger : logging.Logger
var message_listeners : List[Union[AsyncWebSocketMessageListener, Callable[[AsyncBaseSocketModeClient, dict, Optional[str]], Awaitable[None]]]]
var message_processor : _asyncio.Future
var message_queue : asyncio.queues.Queue
var message_receiver : Optional[_asyncio.Future]
var ping_interval : float
var socket_mode_request_listeners : List[Union[AsyncSocketModeRequestListener, Callable[[AsyncBaseSocketModeClient, SocketModeRequest], Awaitable[None]]]]
var trace_enabled : bool
var web_client : AsyncWebClient
var wss_uri : Optional[str]
Static methods
def build_session_id(session: websockets.legacy.client.WebSocketClientProtocol) ‑> str
-
Expand source code
@classmethod def build_session_id(cls, session: WebSocketClientProtocol) -> str: if session is None: return "" return "s_" + str(hash(session))
Methods
async def close(self)
-
Expand source code
async def close(self): self.closed = True self.auto_reconnect_enabled = False await self.disconnect() self.message_processor.cancel() if self.current_session_monitor is not None: self.current_session_monitor.cancel() if self.message_receiver is not None: self.message_receiver.cancel()
async def connect(self)
-
Expand source code
async def connect(self): if self.wss_uri is None: self.wss_uri = await self.issue_new_wss_url() old_session: Optional[WebSocketClientProtocol] = None if self.current_session is None else self.current_session # NOTE: websockets does not support proxy settings self.current_session = await websockets.connect( uri=self.wss_uri, ping_interval=self.ping_interval, ) session_id = await self.session_id() self.auto_reconnect_enabled = self.default_auto_reconnect_enabled self.logger.info(f"A new session ({session_id}) has been established") if self.current_session_monitor is not None: self.current_session_monitor.cancel() self.current_session_monitor = asyncio.ensure_future(self.monitor_current_session()) if self.logger.level <= logging.DEBUG: self.logger.debug(f"A new monitor_current_session() executor has been recreated for {session_id}") if self.message_receiver is not None: self.message_receiver.cancel() self.message_receiver = asyncio.ensure_future(self.receive_messages()) if self.logger.level <= logging.DEBUG: self.logger.debug(f"A new receive_messages() executor has been recreated for {session_id}") if old_session is not None: await old_session.close() old_session_id = self.build_session_id(old_session) self.logger.info(f"The old session ({old_session_id}) has been abandoned")
async def disconnect(self)
-
Expand source code
async def disconnect(self): if self.current_session is not None: await self.current_session.close()
async def is_connected(self) ‑> bool
-
Expand source code
async def is_connected(self) -> bool: return not self.closed and self.current_session is not None and not self.current_session.closed
async def monitor_current_session(self) ‑> None
-
Expand source code
async def monitor_current_session(self) -> None: # In the asyncio runtime, accessing a shared object (self.current_session here) from # multiple tasks can cause race conditions and errors. # To avoid such, we access only the session that is active when this loop starts. session: WebSocketClientProtocol = self.current_session session_id: str = await self.session_id() if self.logger.level <= logging.DEBUG: self.logger.debug(f"A new monitor_current_session() execution loop for {session_id} started") try: while not self.closed: if session != self.current_session: if self.logger.level <= logging.DEBUG: self.logger.debug(f"The monitor_current_session task for {session_id} is now cancelled") break await asyncio.sleep(self.ping_interval) try: if self.auto_reconnect_enabled and (session is None or session.closed): self.logger.info(f"The session ({session_id}) seems to be already closed. Reconnecting...") await self.connect_to_new_endpoint() except Exception as e: self.logger.error( "Failed to check the current session or reconnect to the server " f"(error: {type(e).__name__}, message: {e}, session: {session_id})" ) except asyncio.CancelledError: if self.logger.level <= logging.DEBUG: self.logger.debug(f"The monitor_current_session task for {session_id} is now cancelled") raise
async def receive_messages(self) ‑> None
-
Expand source code
async def receive_messages(self) -> None: # In the asyncio runtime, accessing a shared object (self.current_session here) from # multiple tasks can cause race conditions and errors. # To avoid such, we access only the session that is active when this loop starts. session: WebSocketClientProtocol = self.current_session session_id: str = await self.session_id() consecutive_error_count = 0 if self.logger.level <= logging.DEBUG: self.logger.debug(f"A new receive_messages() execution loop with {session_id} started") try: while not self.closed: if session != self.current_session: if self.logger.level <= logging.DEBUG: self.logger.debug(f"The running receive_messages task for {session_id} is now cancelled") break try: message = await session.recv() if message is not None: if isinstance(message, bytes): message = message.decode("utf-8") if self.logger.level <= logging.DEBUG: self.logger.debug(f"Received message: {message}, session: {session_id}") await self.enqueue_message(message) consecutive_error_count = 0 except Exception as e: consecutive_error_count += 1 self.logger.error( f"Failed to receive or enqueue a message: {type(e).__name__}, error: {e}, session: {session_id}" ) if isinstance(e, websockets.ConnectionClosedError): await asyncio.sleep(self.ping_interval) else: await asyncio.sleep(consecutive_error_count) except asyncio.CancelledError: if self.logger.level <= logging.DEBUG: self.logger.debug(f"The running receive_messages task for {session_id} is now cancelled") raise
async def send_message(self, message: str)
-
Expand source code
async def send_message(self, message: str): session = self.current_session session_id = self.build_session_id(session) if self.logger.level <= logging.DEBUG: self.logger.debug(f"Sending a message: {message}, session: {session_id}") try: await session.send(message) except WebSocketException as e: # We rarely get this exception while replacing the underlying WebSocket connections. # We can do one more try here as the self.current_session should be ready now. if self.logger.level <= logging.DEBUG: self.logger.debug( f"Failed to send a message (error: {e}, message: {message}, session: {session_id})" " as the underlying connection was replaced. Retrying the same request only one time..." ) # Although acquiring self.connect_operation_lock also for the first method call is the safest way, # we avoid synchronizing a lot for better performance. That's why we are doing a retry here. try: if await self.is_connected(): await self.current_session.send(message) else: self.logger.warning(f"The current session ({session_id}) is no longer active. Failed to send a message") raise e finally: if self.connect_operation_lock.locked() is True: self.connect_operation_lock.release()
async def session_id(self) ‑> str
-
Expand source code
async def session_id(self) -> str: return self.build_session_id(self.current_session)