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Initial commit: add .gitignore and README
2026-02-09 21:51:42 -08:00

120 lines
3.9 KiB
Python

from __future__ import annotations
import sys
import time
from multiprocessing import Queue, get_context
from unittest import TestCase, main
import pytest
from mypy.ipc import IPCClient, IPCServer
CONNECTION_NAME = "dmypy-test-ipc"
def server(msg: str, q: Queue[str]) -> None:
server = IPCServer(CONNECTION_NAME)
q.put(server.connection_name)
data = ""
while not data:
with server:
server.write(msg)
data = server.read()
server.cleanup()
def server_multi_message_echo(q: Queue[str]) -> None:
server = IPCServer(CONNECTION_NAME)
q.put(server.connection_name)
data = ""
with server:
while data != "quit":
data = server.read()
server.write(data)
server.cleanup()
class IPCTests(TestCase):
def setUp(self) -> None:
if sys.platform == "linux":
# The default "fork" start method is potentially unsafe
self.ctx = get_context("forkserver")
else:
self.ctx = get_context("spawn")
def test_transaction_large(self) -> None:
queue: Queue[str] = self.ctx.Queue()
msg = "t" * 200000 # longer than the max read size of 100_000
p = self.ctx.Process(target=server, args=(msg, queue), daemon=True)
p.start()
connection_name = queue.get()
with IPCClient(connection_name, timeout=1) as client:
assert client.read() == msg
client.write("test")
queue.close()
queue.join_thread()
p.join()
def test_connect_twice(self) -> None:
queue: Queue[str] = self.ctx.Queue()
msg = "this is a test message"
p = self.ctx.Process(target=server, args=(msg, queue), daemon=True)
p.start()
connection_name = queue.get()
with IPCClient(connection_name, timeout=1) as client:
assert client.read() == msg
client.write("") # don't let the server hang up yet, we want to connect again.
with IPCClient(connection_name, timeout=1) as client:
assert client.read() == msg
client.write("test")
queue.close()
queue.join_thread()
p.join()
assert p.exitcode == 0
def test_multiple_messages(self) -> None:
queue: Queue[str] = self.ctx.Queue()
p = self.ctx.Process(target=server_multi_message_echo, args=(queue,), daemon=True)
p.start()
connection_name = queue.get()
with IPCClient(connection_name, timeout=1) as client:
# "foo bar" with extra accents on letters.
# In UTF-8 encoding so we don't confuse editors opening this file.
fancy_text = b"f\xcc\xb6o\xcc\xb2\xf0\x9d\x91\x9c \xd0\xb2\xe2\xb7\xa1a\xcc\xb6r\xcc\x93\xcd\x98\xcd\x8c"
client.write(fancy_text.decode("utf-8"))
assert client.read() == fancy_text.decode("utf-8")
client.write("Test with spaces")
client.write("Test write before reading previous")
time.sleep(0) # yield to the server to force reading of all messages by server.
assert client.read() == "Test with spaces"
assert client.read() == "Test write before reading previous"
client.write("quit")
assert client.read() == "quit"
queue.close()
queue.join_thread()
p.join()
assert p.exitcode == 0
# Run test_connect_twice a lot, in the hopes of finding issues.
# This is really slow, so it is skipped, but can be enabled if
# needed to debug IPC issues.
@pytest.mark.skip
def test_connect_alot(self) -> None:
t0 = time.time()
for i in range(1000):
try:
print(i, "start")
self.test_connect_twice()
finally:
t1 = time.time()
print(i, t1 - t0)
sys.stdout.flush()
t0 = t1
if __name__ == "__main__":
main()