from .api import TwitterCall, wrap_response, TwitterHTTPError
+def recv_chunk(sock): # -> bytearray:
+
+ buf = sock.recv(8) # Scan for an up to 16MiB chunk size (0xffffff).
+ crlf = buf.find(b'\r\n') # Find the HTTP chunk size.
+
+ if crlf > 0: # If there is a length, then process it
+
+ remaining = int(buf[:crlf], 16) # Decode the chunk size.
+
+ start = crlf + 2 # Add in the length of the header's CRLF pair.
+ end = len(buf) - start
+
+ chunk = bytearray(remaining)
+
+ if remaining <= 2: # E.g. an HTTP chunk with just a keep-alive delimiter.
+ chunk[:remaining] = buf[start:start + remaining]
+ # There are several edge cases (remaining == [3-6]) 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.
+ chunk[:end] = buf[start:]
+ chunk[end:] = sock.recv(remaining - end)
+ sock.recv(2) # Read the trailing CRLF pair. Throw it away.
+
+ return chunk
+
+ return bytearray()
+
+## recv_chunk()
+
+
class TwitterJSONIter(object):
def __init__(self, handle, uri, arg_data, block=True, timeout=None):
- self.decoder = json.JSONDecoder()
self.handle = handle
- self.buf = b""
+ self.uri = uri
+ self.arg_data = arg_data
self.block = block
self.timeout = timeout
- self.timer = time.time()
def __iter__(self):
- if sys.version_info >= (3, 0):
- sock = self.handle.fp.raw._sock
- else:
- sock = self.handle.fp._sock.fp._sock
+ sock = self.handle.fp.raw._sock if sys.version_info >= (3, 0) else self.handle.fp._sock.fp._sock
sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
- if not self.block or self.timeout:
- sock.setblocking(False)
+ sock.setblocking(self.block and not self.timeout)
+ buf = u''
+ json_decoder = json.JSONDecoder()
+ timer = time.time()
while True:
try:
- utf8_buf = self.buf.decode('utf8').lstrip()
- res, ptr = self.decoder.raw_decode(utf8_buf)
- self.buf = utf8_buf[ptr:].encode('utf8')
+ buf = buf.lstrip()
+ res, ptr = json_decoder.raw_decode(buf)
+ buf = buf[ptr:]
yield wrap_response(res, self.handle.headers)
- self.timer = time.time()
+ timer = time.time()
continue
except ValueError as e:
- if self.block:
- pass
- else:
- yield None
- except urllib_error.HTTPError as e:
- raise TwitterHTTPError(e, uri, self.format, arg_data)
- # this is a non-blocking read (ie, it will return if any data is available)
+ if self.block: pass
+ else: yield None
try:
+ buf = buf.lstrip() # Remove any keep-alive delimiters to detect hangups.
if self.timeout:
ready_to_read = select.select([sock], [], [], self.timeout)
if ready_to_read[0]:
- self.buf += sock.recv(1024)
- if time.time() - self.timer > self.timeout:
- yield {"timeout":True}
- else:
- yield {"timeout":True}
+ buf += recv_chunk(sock).decode('utf-8') # This is a non-blocking read.
+ if time.time() - timer > self.timeout:
+ yield {'timeout': True}
+ else: yield {'timeout': True}
else:
- self.buf += sock.recv(1024)
+ buf += recv_chunk(sock).decode('utf-8')
+ if not buf and self.block:
+ yield {'hangup': True}
except SSLError as e:
- if (not self.block or self.timeout) and (e.errno == 2):
- # Apparently this means there was nothing in the socket buf
- pass
- else:
- raise
+ # Error from a non-blocking read of an empty buffer.
+ if (not self.block or self.timeout) and (e.errno == 2): pass
+ else: raise
def handle_stream_response(req, uri, arg_data, block, timeout=None):
- handle = urllib_request.urlopen(req,)
+ try:
+ handle = urllib_request.urlopen(req,)
+ except urllib_error.HTTPError as e:
+ raise TwitterHTTPError(e, uri, 'json', arg_data)
return iter(TwitterJSONIter(handle, uri, arg_data, block, timeout=timeout))
class TwitterStreamCallWithTimeout(TwitterCall):
TwitterStreamCall.__init__(
self, auth=auth, format="json", domain=domain,
callable_cls=call_cls,
- secure=secure, uriparts=uriparts, timeout=timeout)
+ secure=secure, uriparts=uriparts, timeout=timeout, gzip=False)