def from_socket(cls, sock: socket.socket) -> "Request":
"""Read and parse the request from a socket object.
Raises:
ValueError: When the request cannot be parsed.
"""
lines = iter_lines(sock)
try:
request_line = next(lines).decode("ascii")
except StopIteration:
raise ValueError("Request line missing")
try:
method, path, __ = request_line.split(" ")
except ValueError:
raise ValueError(f"Malformed request line {request_line!r}.")
headers = Headers()
while True:
try:
line = next(lines)
except StopIteration as e:
buff = e.value
break
try:
name, __, value = line.decode("ascii").partition(":")
headers.add(name.lower(), value.lstrip())
except ValueError:
raise ValueError(f"Malformed header line {line!r}.")
body = BodyReader(sock, buff=buff)
return cls(method=method.upper(),
path=path,
headers=headers,
body=body)
