+class SocketShim(io.IOBase):
+ """
+ Adapts a raw socket to fit the IO protocol.
+ """
+ def __init__(self, sock):
+ self.sock = sock
+ def readable(self):
+ return True
+ def read(self, size):
+ return self.sock.read(size)
+ def readinto(self, buf):
+ return self.sock.recv_into(buf)
+
+def recv_chunk(reader): # -> bytearray:
+ for headerlen in range(12):
+ header = reader.peek(headerlen)[:headerlen]
+ if header.endswith(CRLF):
+ break
+ else:
+ raise ChunkDecodeError()
+
+ size = int(header, 16) # Decode the chunk size
+ reader.read(headerlen) # Ditch the header
+
+ if size == 0:
+ raise EndOfStream()
+
+ chunk = bytearray()
+ while len(chunk) < size:
+ remainder = size - len(chunk)
+ chunk.extend(reader.read(remainder))
+
+ reader.read(2) # Ditch remaining CRLF
+
+ return chunk
+
+
+class Timer(object):
+ def __init__(self, timeout):
+ # If timeout is None, we never expire.
+ self.timeout = timeout
+ self.reset()
+
+ def reset(self):
+ self.time = time.time()
+
+ def expired(self):
+ """
+ If expired, reset the timer and return True.
+ """
+ if self.timeout is None:
+ return False
+ elif time.time() - self.time > self.timeout:
+ self.reset()
+ return True
+ return False