pincer.core.gateway.Gateway.__init__() - Code Metrics - Inspection of ":bug: :sparkles: Added VERY basic sharding support..." - Pincer-org/Pincer - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — main (#329)

unknown

created 2021-12-27 02:21 UTC

pincer.core.gateway.Gateway.init() B

↳ Parent: pincer.core.gateway

Complexity

Conditions

Size

Total Lines	82
Code Lines	46

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	46
dl	0
loc	82
rs	8.7672
c	0
b	0
f	0
cc	2
nop	7

How to fix Long Method

# Copyright Pincer 2021-Present

# Full MIT License can be found in `LICENSE` at the project root.


from __future__ import annotations

from asyncio import create_task, Task, ensure_future, sleep
from dataclasses import dataclass
from datetime import datetime
from itertools import repeat, count, chain
import logging
from platform import system
from random import random
from typing import TYPE_CHECKING, Any, Dict, Callable, Optional
from zlib import decompressobj

from aiohttp import (
    ClientSession, WSMsgType, ClientConnectorError, ClientWebSocketResponse
)

from . import __package__
from ..utils.api_object import APIObject
from .._config import GatewayConfig
from ..core.dispatch import GatewayDispatch
from ..exceptions import (

    InvalidTokenError, ConnectionError, GatewayError, UnhandledException
)

if TYPE_CHECKING:
    from ..objects.app.intents import Intents
    Handler = Callable[[GatewayDispatch], None]

_log = logging.getLogger(__package__)

ZLIB_SUFFIX = b'\x00\x00\xff\xff'
inflator = decompressobj()


@dataclass
class SessionStartLimit(APIObject):
    """Session start limit info returned from the `gateway/bot` endpoint"""
    total: int
    remaining: int
    reset_after: int
    max_concurrency: int


@dataclass
class GatewayInfo(APIObject):
    """Gateway info returned from the `gateway/bot` endpoint"""
    url: str
    shards: int
    session_start_limit: SessionStartLimit


class Gateway:

    """The Gateway handles all interactions with the Discord Websocket API.
    This also contains the main event loop, and handles the heartbeat.

    Running the Gateway will create a connection with the
    Discord Websocket API on behalf of the provided token.

    This token must be a bot token.
    (Which can be found on
    `<https://discord.com/developers/applications/>`_)
    """

    def __init__(
            self,
            token: str, *,
            intents: Intents,
            url: str,
            shard: int,
            num_shards: int
    ) -> None:
        if len(token) != 59:
            raise InvalidTokenError(
                "Discord Token must have exactly 59 characters."
            )

        self.token = token
        self.intents = intents
        self.url = url
        self.shard = shard
        self.num_shards = num_shards
        self.shard_key = [shard, num_shards]

        self.__dispatch_handlers: Dict[int, Handler] = {
            1: self.handle_heartbeat_req,
            7: self.handle_reconnect,
            9: self.handle_invalid_session,
            10: self.identify_and_handle_hello,
            11: self.handle_heartbeat
        }

        # 4000 and 4009 are not included. The client will reconnect when receiving
        # either.
        self.__close_codes: Dict[int, GatewayError] = {
            4001: GatewayError("Invalid opcode was sent"),
            4002: GatewayError("Invalid payload was sent."),
            4003: GatewayError("Payload was sent prior to identifying"),
            4004: GatewayError("Token is not valid"),
            4005: GatewayError(
                "Authentication was sent after client already authenticated"
            ),
            4007: GatewayError("Invalid sequence sent when starting new session"),
            4008: GatewayError("Client was rate limited"),
            4010: GatewayError("Invalid shard"),
            4011: GatewayError("Sharding required"),
            4012: GatewayError("Invalid API version"),
            4013: GatewayError("Invalid intents"),
            4014: GatewayError("Disallowed intents")
        }

        # ClientSession to be used for this Dispatcher
        self.__session: Optional[ClientSession] = None

        # This type `_WSRequestContextManager` isn't exposed by aiohttp.
        # `ClientWebSocketResponse` is a parent class.
        self.__socket: Optional[ClientWebSocketResponse] = None

        # Buffer used to store information in transport conpression.
        self.__buffer = bytearray()

        # The gateway can be disconnected from Discord. This variable stores if the
        # gateway should send a hello or reconnect.
        self.__should_reconnect: bool = False

        # The sequence number for the last received payload. This is used reconnecting.
        self.__sequence_number: int = 0

        # The heartbeat task
        self.__heartbeat_task: Optional[Task] = None

        # Keeps the Client waiting until the next heartbeat
        self.__wait_for_heartbeat: Optional[Task] = None

        # How long the client should wait between each Heartbeat.
        self.__heartbeat_interval: Optional[int] = None

        # Tracks whether the gateway has received an ack (opcode 11) since the last
        # heartbeat.
        #   True: An ack has been received
        #   False: No ack has been received. Attempt to reconnect with gateway,
        self.__has_received_ack: bool = True

        # Session ID received from `on_ready` event. It is set in the `on_ready`
        # middleware. This is used reconnecting.
        self.__session_id: Optional[str] = None

    def __del__(self):
        """Delete method ensures all connections are closed"""
        if self.__socket:
            create_task(self.__socket.close())
        if self.__session:
            create_task(self.__session.close())

    async def init_session(self):
        """
        Crates the ClientSession. ALWAYS run this function right after initializing
        a Gateway.
        """
        self.__session = ClientSession()

    def append_handlers(self, handlers: Dict[int, Handler]):
        """The Client that uses the handler can append their own methods. The gateway
        will run those methods when the specified opcode is received.
        """
        self.__dispatch_handlers = handlers | self.__dispatch_handlers

    def set_session_id(self, _id: str):
        """Session id is private for consistency"""
        self.__session_id = _id

    def decompress_msg(self, msg: bytes) -> Optional[str]:

        if GatewayConfig.compression == "zlib-payload":
            return inflator.decompress(msg)

        if GatewayConfig.compression == "zlib-stream":
            self.__buffer.extend(msg)

            if len(self.__buffer) < 4 or self.__buffer[-4:] != ZLIB_SUFFIX:
                return None

            msg = inflator.decompress(msg)
            self.__buffer = bytearray()
            return msg

        return None

    async def start_loop(self):
        """Instantiate the dispatcher, this will create a connection to the
        Discord websocket API on behalf of the client whose token has
        been passed.
        """
        for i in count():
            try:
                self.__socket = await self.__session.ws_connect(
                    GatewayConfig.make_uri(self.url)
                )
                break
            except ClientConnectorError as e:
                if i > GatewayConfig.MAX_RETRIES:
                    raise ConnectionError from e

                _log.warning(
                    "%s Could not open websocket with Discord."
                    " Retrying in 15 seconds...",
                    self.shard_key
                )
                await sleep(15)

        _log.debug("%s Starting envent loop...", self.shard_key)
        await self.event_loop()

    async def event_loop(self):
        """Handles receiving messages and decompressing them if needed"""
        async for msg in self.__socket:
            if msg.type == WSMsgType.TEXT:
                await self.handle_data(msg.data)
            elif msg.type == WSMsgType.BINARY:
                # Message from transport compression that isn't complete returns None
                data = self.decompress_msg(msg.data)
                if data:
                    await self.handle_data(data)
            elif msg.type == WSMsgType.ERROR:
                raise GatewayError from self.__socket.exception()

        # The loop is broken when the gateway stops receiving messages.
        # The "error" op codes are in `self.__close_codes`. The rest of the
        # close codes are unknown issues (such as a unintended disconnect) so the
        # client should reconnect to the gateway.
        err = self.__close_codes.get(self.__socket.close_code)

        if err:
            raise err

        _log.debug(
            "%s Disconnected from Gateway due without any errors. Reconnecting.",
            self.shard_key
        )
        self.__should_reconnect = True
        self.start_loop()

    async def handle_data(self, data: Dict[Any]):
        """Method is run when a payload is received from the gateway.
        The message is expected to already have been decompressed.
        Handling the opcode is forked to the background so they aren't blocking.
        """
        payload = GatewayDispatch.from_string(data)

        # Op code -1 is activated on all payloads
        op_negative_one = self.__dispatch_handlers.get(-1)
        if op_negative_one:
            ensure_future(op_negative_one(payload))

        _log.debug(
            "%s %s GatewayDispatch with opcode %s received",
            self.shard_key,
            datetime.now(),
            payload.op
        )

        # Many events are sent with a `null` sequence. This sequence should not
        # be tracked.
        if payload.seq is not None:
            self.__sequence_number = payload.seq
            _log.debug("%s Set sequence number to %s", self.shard_key, payload.seq)

        handler = self.__dispatch_handlers.get(payload.op)

        if handler is None:
            raise UnhandledException(f"Opcode {payload.op} does not have a handler")

        ensure_future(handler(payload))

    async def handle_heartbeat_req(self, payload: GatewayDispatch):

        """
        Opcode 1 - Instantly send a heartbeat.
        """
        self.send_next_heartbeat()

    async def handle_reconnect(self, payload: GatewayDispatch):

        """
        Opcode 7 - Reconnect and resume immediately.
        """
        _log.debug(
            "%s Requested to reconnect to Discord. Closing session and attempting to"
            " resume...",
            self.shard_key
        )

        await self.__socket.close(code=1000)
        self.__should_reconnect = True
        await self.start_loop()

    async def handle_invalid_session(self, payload: GatewayDispatch):

        """
        Opcode 9 - Invalid connection
        Attempt to relog. This is probably because the session was already invalidated
        when we tried to reconnect.
        """
        _log.debug("%s Invalid session, attempting to relog...", self.shard_key)
        self.__should_reconnect = False
        await self.start_loop()

    async def identify_and_handle_hello(self, payload: GatewayDispatch):
        """
        Opcode 10 - Hello there general kenobi
        Runs when we connect to the gateway for the first time and every time after.
        If the client thinks it should reconnect, the opcode 6 resume payload is sent
        instead of the opcode 2 hello payload. A new session is only started after a
        reconnect if pcode 9 is received.

        Successful reconnects are handled in the `resumed` middleware.
        """
        if self.__should_reconnect:
            _log.debug("%s Resuming connection with Discord", self.shard_key)

            await self.send(str(GatewayDispatch(
                6, {
                    "token": self.token,
                    "session_id": self.__session_id,
                    "seq": self.__sequence_number
                }
            )))
            return

        await self.send(str(
            GatewayDispatch(
                2, {
                    "token": self.token,
                    "intents": self.intents,
                    "properties": {
                        "$os": system(),
                        "$browser": __package__,
                        "$device": __package__
                    },
                    "compress": GatewayConfig.compressed(),
                    "shard": self.shard_key
                }
            )
        ))
        self.__heartbeat_interval = payload.data["heartbeat_interval"]

        # This process should already be forked to the background so there is no need to
        # `ensure_future()` here.
        self.start_heartbeat()

    async def handle_heartbeat(self, payload: GatewayDispatch):

        """
        Opcode 11 - Heatbeat
        Track that the heartbeat has been received using shared state (Rustaceans would
        be very mad)
        """
        self.__has_received_ack = True

    async def send(self, payload: str):
        """
        Send a string object to the payload. Most of this method is just logging,
        the last line is the only one that matters for functionality.
        """
        safe_payload = payload.replace(self.token, "%s..." % self.token[:10])

        if self.__session_id:
            safe_payload = safe_payload.replace(
                self.__session_id, "%s..." % self.__session_id[:4]
            )

        _log.debug(
            "%s Sending payload: %s",
            self.shard_key,
            safe_payload
        )

        if self.__socket.closed:
            _log.debug(
                "%s Socket is closing. Payload not sent.",
                self.shard_key
            )
            return

        await self.__socket.send_str(payload)

    def start_heartbeat(self):
        """
        Starts the heartbeat if it is not already running.
        """
        if not self.__heartbeat_task or self.__heartbeat_task.cancelled():
            self.__heartbeat_task = ensure_future(self.__heartbeat_loop())

    def stop_heartbeat(self):

        self.__heartbeat_task.cancel()

    def send_next_heartbeat(self):
        """
        It is expected to always be waiting for a hearbeat. By canceling that task,
        a heartbeat can be sent.
        """
        self.__wait_for_heartbeat.cancel()

    async def __heartbeat_loop(self):
        """
        The heartbeat is responsible for keeping the connection to Discord alive.

        Jitter is only random for the first heartbeat. It should be 1 every other
        heartbeat.
        """
        _log.debug("%s Starting heartbeat loop...", self.shard_key)

        # When waiting for first heartbeat, there hasn't been an ack received yet.
        # Set to true so the ack received check doesn't incorrectly fail.
        self.__has_received_ack = True

        for jitter in chain((random(),), repeat(1)):
            duration = self.__heartbeat_interval * jitter

            _log.debug(
                "%s %s sending heartbeat in %sms",
                self.shard_key, datetime.now(),
                duration
            )

            # Task is needed so waiting can be cancelled by op code 1
            self.__wait_for_heartbeat = create_task(
                sleep(duration / 1000)
            )

            await self.__wait_for_heartbeat

            if not self.__has_received_ack:
                # Close code is specified to be anything that is not 1000 in the docs.
                _log.debug(
                    "%s %s ack not received. Attempting to reconnect."
                    " Closing socket with close code 1001. \U0001f480",
                    datetime.now(),
                    self.shard_key
                )
                await self.__socket.close(code=1001)
                self.__should_reconnect = True
                # A new loop is started in the background while this one is stopped.
                ensure_future(self.start_loop())
                self.stop_heartbeat()
                return

            self.__has_received_ack = False
            await self.send(str(GatewayDispatch(1, data=self.__sequence_number)))
            _log.debug("%s sent heartbeat", self.shard_key)


1			# Copyright Pincer 2021-Present
			0 ignored issues – show introduced 2021-09-06 08:54 UTC by Report Bug Copy Issue Report Missing module docstring Loading history...
2			# Full MIT License can be found in `LICENSE` at the project root.
3
4
5			from __future__ import annotations
6
7			from asyncio import create_task, Task, ensure_future, sleep
8			from dataclasses import dataclass
9			from datetime import datetime
10			from itertools import repeat, count, chain
11			import logging
12			from platform import system
13			from random import random
14			from typing import TYPE_CHECKING, Any, Dict, Callable, Optional
15			from zlib import decompressobj
16
17			from aiohttp import (
18			ClientSession, WSMsgType, ClientConnectorError, ClientWebSocketResponse
19			)
20
21			from . import __package__
22			from ..utils.api_object import APIObject
23			from .._config import GatewayConfig
24			from ..core.dispatch import GatewayDispatch
25			from ..exceptions import (
			0 ignored issues – show Bug Best Practice introduced 2021-12-26 23:24 UTC by Report Bug Copy Issue Report This seems to re-define the built-in `ConnectionError`. It is generally discouraged to redefine built-ins as this makes code very hard to read. Loading history...
26			InvalidTokenError, ConnectionError, GatewayError, UnhandledException
27			)
28
29			if TYPE_CHECKING:
30			from ..objects.app.intents import Intents
31			Handler = Callable[[GatewayDispatch], None]
32
33			_log = logging.getLogger(__package__)
34
35			ZLIB_SUFFIX = b'\x00\x00\xff\xff'
36			inflator = decompressobj()
37
38
39			@dataclass
40			class SessionStartLimit(APIObject):
41			"""Session start limit info returned from the `gateway/bot` endpoint"""
42			total: int
43			remaining: int
44			reset_after: int
45			max_concurrency: int
46
47
48			@dataclass
49			class GatewayInfo(APIObject):
50			"""Gateway info returned from the `gateway/bot` endpoint"""
51			url: str
52			shards: int
53			session_start_limit: SessionStartLimit
54
55
56			class Gateway:
			0 ignored issues – show best-practice introduced 2021-12-26 23:24 UTC by Report Bug Copy Issue Report Too many instance attributes (18/7) Loading history...
57			"""The Gateway handles all interactions with the Discord Websocket API.
58			This also contains the main event loop, and handles the heartbeat.
59
60			Running the Gateway will create a connection with the
61			Discord Websocket API on behalf of the provided token.
62
63			This token must be a bot token.
64			(Which can be found on
65			`<https://discord.com/developers/applications/>`_)
66			"""
67
68			def __init__(
69			self,
70			token: str, *,
71			intents: Intents,
72			url: str,
73			shard: int,
74			num_shards: int
75			) -> None:
76			if len(token) != 59:
77			raise InvalidTokenError(
78			"Discord Token must have exactly 59 characters."
79			)
80
81			self.token = token
82			self.intents = intents
83			self.url = url
84			self.shard = shard
85			self.num_shards = num_shards
86			self.shard_key = [shard, num_shards]
87
88			self.__dispatch_handlers: Dict[int, Handler] = {
89			1: self.handle_heartbeat_req,
90			7: self.handle_reconnect,
91			9: self.handle_invalid_session,
92			10: self.identify_and_handle_hello,
93			11: self.handle_heartbeat
94			}
95
96			# 4000 and 4009 are not included. The client will reconnect when receiving
97			# either.
98			self.__close_codes: Dict[int, GatewayError] = {
99			4001: GatewayError("Invalid opcode was sent"),
100			4002: GatewayError("Invalid payload was sent."),
101			4003: GatewayError("Payload was sent prior to identifying"),
102			4004: GatewayError("Token is not valid"),
103			4005: GatewayError(
104			"Authentication was sent after client already authenticated"
105			),
106			4007: GatewayError("Invalid sequence sent when starting new session"),
107			4008: GatewayError("Client was rate limited"),
108			4010: GatewayError("Invalid shard"),
109			4011: GatewayError("Sharding required"),
110			4012: GatewayError("Invalid API version"),
111			4013: GatewayError("Invalid intents"),
112			4014: GatewayError("Disallowed intents")
113			}
114
115			# ClientSession to be used for this Dispatcher
116			self.__session: Optional[ClientSession] = None
117
118			# This type `_WSRequestContextManager` isn't exposed by aiohttp.
119			# `ClientWebSocketResponse` is a parent class.
120			self.__socket: Optional[ClientWebSocketResponse] = None
121
122			# Buffer used to store information in transport conpression.
123			self.__buffer = bytearray()
124
125			# The gateway can be disconnected from Discord. This variable stores if the
126			# gateway should send a hello or reconnect.
127			self.__should_reconnect: bool = False
128
129			# The sequence number for the last received payload. This is used reconnecting.
130			self.__sequence_number: int = 0
131
132			# The heartbeat task
133			self.__heartbeat_task: Optional[Task] = None
134
135			# Keeps the Client waiting until the next heartbeat
136			self.__wait_for_heartbeat: Optional[Task] = None
137
138			# How long the client should wait between each Heartbeat.
139			self.__heartbeat_interval: Optional[int] = None
140
141			# Tracks whether the gateway has received an ack (opcode 11) since the last
142			# heartbeat.
143			# True: An ack has been received
144			# False: No ack has been received. Attempt to reconnect with gateway,
145			self.__has_received_ack: bool = True
146
147			# Session ID received from `on_ready` event. It is set in the `on_ready`
148			# middleware. This is used reconnecting.
149			self.__session_id: Optional[str] = None
150
151			def __del__(self):
152			"""Delete method ensures all connections are closed"""
153			if self.__socket:
154			create_task(self.__socket.close())
155			if self.__session:
156			create_task(self.__session.close())
157
158			async def init_session(self):
159			"""
160			Crates the ClientSession. ALWAYS run this function right after initializing
161			a Gateway.
162			"""
163			self.__session = ClientSession()
164
165			def append_handlers(self, handlers: Dict[int, Handler]):
166			"""The Client that uses the handler can append their own methods. The gateway
167			will run those methods when the specified opcode is received.
168			"""
169			self.__dispatch_handlers = handlers \| self.__dispatch_handlers
170
171			def set_session_id(self, _id: str):
172			"""Session id is private for consistency"""
173			self.__session_id = _id
174
175			def decompress_msg(self, msg: bytes) -> Optional[str]:
			0 ignored issues – show introduced 2021-12-26 23:24 UTC by Report Bug Copy Issue Report Missing function or method docstring Loading history...
176			if GatewayConfig.compression == "zlib-payload":
177			return inflator.decompress(msg)
178
179			if GatewayConfig.compression == "zlib-stream":
180			self.__buffer.extend(msg)
181
182			if len(self.__buffer) < 4 or self.__buffer[-4:] != ZLIB_SUFFIX:
183			return None
184
185			msg = inflator.decompress(msg)
186			self.__buffer = bytearray()
187			return msg
188
189			return None
190
191			async def start_loop(self):
192			"""Instantiate the dispatcher, this will create a connection to the
193			Discord websocket API on behalf of the client whose token has
194			been passed.
195			"""
196			for i in count():
197			try:
198			self.__socket = await self.__session.ws_connect(
199			GatewayConfig.make_uri(self.url)
200			)
201			break
202			except ClientConnectorError as e:
203			if i > GatewayConfig.MAX_RETRIES:
204			raise ConnectionError from e
205
206			_log.warning(
207			"%s Could not open websocket with Discord."
208			" Retrying in 15 seconds...",
209			self.shard_key
210			)
211			await sleep(15)
212
213			_log.debug("%s Starting envent loop...", self.shard_key)
214			await self.event_loop()
215
216			async def event_loop(self):
217			"""Handles receiving messages and decompressing them if needed"""
218			async for msg in self.__socket:
219			if msg.type == WSMsgType.TEXT:
220			await self.handle_data(msg.data)
221			elif msg.type == WSMsgType.BINARY:
222			# Message from transport compression that isn't complete returns None
223			data = self.decompress_msg(msg.data)
224			if data:
225			await self.handle_data(data)
226			elif msg.type == WSMsgType.ERROR:
227			raise GatewayError from self.__socket.exception()
228
229			# The loop is broken when the gateway stops receiving messages.
230			# The "error" op codes are in `self.__close_codes`. The rest of the
231			# close codes are unknown issues (such as a unintended disconnect) so the
232			# client should reconnect to the gateway.
233			err = self.__close_codes.get(self.__socket.close_code)
234
235			if err:
236			raise err
237
238			_log.debug(
239			"%s Disconnected from Gateway due without any errors. Reconnecting.",
240			self.shard_key
241			)
242			self.__should_reconnect = True
243			self.start_loop()
244
245			async def handle_data(self, data: Dict[Any]):
246			"""Method is run when a payload is received from the gateway.
247			The message is expected to already have been decompressed.
248			Handling the opcode is forked to the background so they aren't blocking.
249			"""
250			payload = GatewayDispatch.from_string(data)
251
252			# Op code -1 is activated on all payloads
253			op_negative_one = self.__dispatch_handlers.get(-1)
254			if op_negative_one:
255			ensure_future(op_negative_one(payload))
256
257			_log.debug(
258			"%s %s GatewayDispatch with opcode %s received",
259			self.shard_key,
260			datetime.now(),
261			payload.op
262			)
263
264			# Many events are sent with a `null` sequence. This sequence should not
265			# be tracked.
266			if payload.seq is not None:
267			self.__sequence_number = payload.seq
268			_log.debug("%s Set sequence number to %s", self.shard_key, payload.seq)
269
270			handler = self.__dispatch_handlers.get(payload.op)
271
272			if handler is None:
273			raise UnhandledException(f"Opcode {payload.op} does not have a handler")
274
275			ensure_future(handler(payload))
276
277			async def handle_heartbeat_req(self, payload: GatewayDispatch):
			0 ignored issues – show Unused Code introduced 2021-12-26 23:24 UTC by Report Bug Copy Issue Report The argument `payload` seems to be unused. Loading history...
278			"""
279			Opcode 1 - Instantly send a heartbeat.
280			"""
281			self.send_next_heartbeat()
282
283			async def handle_reconnect(self, payload: GatewayDispatch):
			0 ignored issues – show Unused Code introduced 2021-12-26 23:24 UTC by Report Bug Copy Issue Report The argument `payload` seems to be unused. Loading history...
284			"""
285			Opcode 7 - Reconnect and resume immediately.
286			"""
287			_log.debug(
288			"%s Requested to reconnect to Discord. Closing session and attempting to"
289			" resume...",
290			self.shard_key
291			)
292
293			await self.__socket.close(code=1000)
294			self.__should_reconnect = True
295			await self.start_loop()
296
297			async def handle_invalid_session(self, payload: GatewayDispatch):
			0 ignored issues – show Unused Code introduced 2021-12-26 23:24 UTC by Report Bug Copy Issue Report The argument `payload` seems to be unused. Loading history...
298			"""
299			Opcode 9 - Invalid connection
300			Attempt to relog. This is probably because the session was already invalidated
301			when we tried to reconnect.
302			"""
303			_log.debug("%s Invalid session, attempting to relog...", self.shard_key)
304			self.__should_reconnect = False
305			await self.start_loop()
306
307			async def identify_and_handle_hello(self, payload: GatewayDispatch):
308			"""
309			Opcode 10 - Hello there general kenobi
310			Runs when we connect to the gateway for the first time and every time after.
311			If the client thinks it should reconnect, the opcode 6 resume payload is sent
312			instead of the opcode 2 hello payload. A new session is only started after a
313			reconnect if pcode 9 is received.
314
315			Successful reconnects are handled in the `resumed` middleware.
316			"""
317			if self.__should_reconnect:
318			_log.debug("%s Resuming connection with Discord", self.shard_key)
319
320			await self.send(str(GatewayDispatch(
321			6, {
322			"token": self.token,
323			"session_id": self.__session_id,
324			"seq": self.__sequence_number
325			}
326			)))
327			return
328
329			await self.send(str(
330			GatewayDispatch(
331			2, {
332			"token": self.token,
333			"intents": self.intents,
334			"properties": {
335			"$os": system(),
336			"$browser": __package__,
337			"$device": __package__
338			},
339			"compress": GatewayConfig.compressed(),
340			"shard": self.shard_key
341			}
342			)
343			))
344			self.__heartbeat_interval = payload.data["heartbeat_interval"]
345
346			# This process should already be forked to the background so there is no need to
347			# `ensure_future()` here.
348			self.start_heartbeat()
349
350			async def handle_heartbeat(self, payload: GatewayDispatch):
			0 ignored issues – show Unused Code introduced 2021-12-26 23:24 UTC by Report Bug Copy Issue Report The argument `payload` seems to be unused. Loading history...
351			"""
352			Opcode 11 - Heatbeat
353			Track that the heartbeat has been received using shared state (Rustaceans would
354			be very mad)
355			"""
356			self.__has_received_ack = True
357
358			async def send(self, payload: str):
359			"""
360			Send a string object to the payload. Most of this method is just logging,
361			the last line is the only one that matters for functionality.
362			"""
363			safe_payload = payload.replace(self.token, "%s..." % self.token[:10])
364
365			if self.__session_id:
366			safe_payload = safe_payload.replace(
367			self.__session_id, "%s..." % self.__session_id[:4]
368			)
369
370			_log.debug(
371			"%s Sending payload: %s",
372			self.shard_key,
373			safe_payload
374			)
375
376			if self.__socket.closed:
377			_log.debug(
378			"%s Socket is closing. Payload not sent.",
379			self.shard_key
380			)
381			return
382
383			await self.__socket.send_str(payload)
384
385			def start_heartbeat(self):
386			"""
387			Starts the heartbeat if it is not already running.
388			"""
389			if not self.__heartbeat_task or self.__heartbeat_task.cancelled():
390			self.__heartbeat_task = ensure_future(self.__heartbeat_loop())
391
392			def stop_heartbeat(self):
			0 ignored issues – show introduced 2021-12-26 23:24 UTC by Report Bug Copy Issue Report Missing function or method docstring Loading history...
393			self.__heartbeat_task.cancel()
394
395			def send_next_heartbeat(self):
396			"""
397			It is expected to always be waiting for a hearbeat. By canceling that task,
398			a heartbeat can be sent.
399			"""
400			self.__wait_for_heartbeat.cancel()
401
402			async def __heartbeat_loop(self):
403			"""
404			The heartbeat is responsible for keeping the connection to Discord alive.
405
406			Jitter is only random for the first heartbeat. It should be 1 every other
407			heartbeat.
408			"""
409			_log.debug("%s Starting heartbeat loop...", self.shard_key)
410
411			# When waiting for first heartbeat, there hasn't been an ack received yet.
412			# Set to true so the ack received check doesn't incorrectly fail.
413			self.__has_received_ack = True
414
415			for jitter in chain((random(),), repeat(1)):
416			duration = self.__heartbeat_interval * jitter
417
418			_log.debug(
419			"%s %s sending heartbeat in %sms",
420			self.shard_key, datetime.now(),
421			duration
422			)
423
424			# Task is needed so waiting can be cancelled by op code 1
425			self.__wait_for_heartbeat = create_task(
426			sleep(duration / 1000)
427			)
428
429			await self.__wait_for_heartbeat
430
431			if not self.__has_received_ack:
432			# Close code is specified to be anything that is not 1000 in the docs.
433			_log.debug(
434			"%s %s ack not received. Attempting to reconnect."
435			" Closing socket with close code 1001. \U0001f480",
436			datetime.now(),
437			self.shard_key
438			)
439			await self.__socket.close(code=1001)
440			self.__should_reconnect = True
441			# A new loop is started in the background while this one is stopped.
442			ensure_future(self.start_loop())
443			self.stop_heartbeat()
444			return
445
446			self.__has_received_ack = False
447			await self.send(str(GatewayDispatch(1, data=self.__sequence_number)))
448			_log.debug("%s sent heartbeat", self.shard_key)
449

Pincer-org / Pincer

Pull Request — main (#329)

pincer.core.gateway.Gateway.__init__() B

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pincer.core.gateway.Gateway.init() B