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102 lines
3.3 KiB
Python
102 lines
3.3 KiB
Python
2 years ago
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from typing import cast, List, Type, Union, ValuesView
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from .._connection import Connection, NEED_DATA, PAUSED
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from .._events import (
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ConnectionClosed,
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Data,
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EndOfMessage,
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Event,
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InformationalResponse,
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Request,
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Response,
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)
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from .._state import CLIENT, CLOSED, DONE, MUST_CLOSE, SERVER
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from .._util import Sentinel
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try:
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from typing import Literal
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except ImportError:
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from typing_extensions import Literal # type: ignore
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def get_all_events(conn: Connection) -> List[Event]:
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got_events = []
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while True:
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event = conn.next_event()
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if event in (NEED_DATA, PAUSED):
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break
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event = cast(Event, event)
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got_events.append(event)
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if type(event) is ConnectionClosed:
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break
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return got_events
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def receive_and_get(conn: Connection, data: bytes) -> List[Event]:
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conn.receive_data(data)
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return get_all_events(conn)
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# Merges adjacent Data events, converts payloads to bytestrings, and removes
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# chunk boundaries.
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def normalize_data_events(in_events: List[Event]) -> List[Event]:
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out_events: List[Event] = []
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for event in in_events:
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if type(event) is Data:
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event = Data(data=bytes(event.data), chunk_start=False, chunk_end=False)
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if out_events and type(out_events[-1]) is type(event) is Data:
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out_events[-1] = Data(
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data=out_events[-1].data + event.data,
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chunk_start=out_events[-1].chunk_start,
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chunk_end=out_events[-1].chunk_end,
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)
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else:
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out_events.append(event)
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return out_events
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# Given that we want to write tests that push some events through a Connection
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# and check that its state updates appropriately... we might as make a habit
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# of pushing them through two Connections with a fake network link in
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# between.
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class ConnectionPair:
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def __init__(self) -> None:
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self.conn = {CLIENT: Connection(CLIENT), SERVER: Connection(SERVER)}
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self.other = {CLIENT: SERVER, SERVER: CLIENT}
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@property
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def conns(self) -> ValuesView[Connection]:
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return self.conn.values()
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# expect="match" if expect=send_events; expect=[...] to say what expected
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def send(
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self,
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role: Type[Sentinel],
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send_events: Union[List[Event], Event],
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expect: Union[List[Event], Event, Literal["match"]] = "match",
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) -> bytes:
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if not isinstance(send_events, list):
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send_events = [send_events]
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data = b""
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closed = False
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for send_event in send_events:
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new_data = self.conn[role].send(send_event)
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if new_data is None:
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closed = True
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else:
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data += new_data
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# send uses b"" to mean b"", and None to mean closed
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# receive uses b"" to mean closed, and None to mean "try again"
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# so we have to translate between the two conventions
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if data:
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self.conn[self.other[role]].receive_data(data)
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if closed:
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self.conn[self.other[role]].receive_data(b"")
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got_events = get_all_events(self.conn[self.other[role]])
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if expect == "match":
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expect = send_events
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if not isinstance(expect, list):
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expect = [expect]
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assert got_events == expect
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return data
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