def assert_file(our_file: io.FileIO, passed_file: io.FileIO):
our_readable = our_file.readable()
got_mode = passed_file.mode
our_stat = os.fstat(our_file.fileno())
passed_stat = os.fstat(passed_file.fileno())
is_fifo = stat.S_ISFIFO(passed_stat.st_mode)
expected_mode = "wb" if our_readable else "rb"
reader = our_file if our_readable else passed_file
writer = passed_file if our_readable else our_file
# Verify that we have a pipe with its two ends
if is_fifo and our_stat == passed_stat:
pipe_size = fcntl.fcntl(writer.fileno(), F_GETPIPE_SZ)
# Check for pending bytes in the pipe
pending_bytes = bytearray(SIZEOF_INT)
fcntl.ioctl(reader.fileno(), termios.FIONREAD, pending_bytes)
pending_bytes = struct.unpack_from("=i", pending_bytes)[0]
test_size = min(mmap.PAGESIZE, pipe_size - pending_bytes)
expected_bytes = random.randbytes(test_size)
writer.write(expected_bytes)
writer.flush()
got_bytes = reader.read(pipe_size)
else:
expected_bytes = None
got_bytes = None
assert (got_mode, is_fifo, passed_stat,
got_bytes) == (expected_mode, True, our_stat, expected_bytes)
def read(cls, source: FileIO, kind: str) -> Context:
"""
Deserialize the given input JSON file as the specified object type.
Args:
source: The input JSON file.
kind: The context object type.
Returns:
The parsed object.
"""
assert source.readable()
_, clz = cls.resolve_ctxtype(kind)
return clz.from_source(source)
