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