- header = sock.recv(8) # Scan for an up to 16MiB chunk size (0xffffff).
- crlf = header.find(b'\r\n') # Find the HTTP chunk size.
-
- if crlf > 0: # If there is a length, then process it
-
- size = int(header[:crlf], 16) # Decode the chunk size. Rarely exceeds 8KiB.
- chunk = bytearray(size)
- start = crlf + 2 # Add in the length of the header's CRLF pair.
-
- if size <= 3: # E.g. an HTTP chunk with just a keep-alive delimiter or end of stream (0).
- chunk[:size] = header[start:start + size]
- # There are several edge cases (size == [4-6]) as the chunk size exceeds the length
- # of the initial read of 8 bytes. With Twitter, these do not, in practice, occur. The
- # shortest JSON message starts with '{"limit":{'. Hence, it exceeds in size the edge cases
- # and eliminates the need to address them.
- else: # There is more to read in the chunk.
- end = len(header) - start
- chunk[:end] = header[start:]
- buffer = memoryview(chunk)[end:] # Create a view into the bytearray to hold the rest of the chunk.
- sock.recv_into(buffer)
- sock.recv(2) # Read the trailing CRLF pair. Throw it away.
-
- return chunk
+ 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()