from .api import TwitterCall, wrap_response, TwitterHTTPError
+python27_3 = sys.version_info >= (2, 7)
+def recv_chunk(sock): # -> bytearray:
+
+ 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:]
+ if python27_3: # When possible, use less memory by reading directly into the buffer.
+ buffer = memoryview(chunk)[end:] # Create a view into the bytearray to hold the rest of the chunk.
+ sock.recv_into(buffer)
+ else: # less efficient for python2.6 compatibility
+ chunk[end:] = sock.recv(max(0, size - end))
+ sock.recv(2) # Read the trailing CRLF pair. Throw it away.
+
+ return chunk
+
+ return bytearray()
+
+
class TwitterJSONIter(object):
def __init__(self, handle, uri, arg_data, block=True, timeout=None):
- self.decoder = json.JSONDecoder()
self.handle = handle
self.uri = uri
self.arg_data = arg_data
- self.buf = b""
self.block = block
self.timeout = timeout
- self.timer = time.time()
-
-
- def recv_chunk(self, sock):
- buf = sock.recv(32)
- if buf:
- # Find the HTTP chunk size.
- decoded = buf.decode('utf-8') # Use UTF-8 instead of ASCII because the data contains JSON, a UTF-8 format.
- start = decoded.find('\r\n')
- if start > 0:
- # Decode the chunk size.
- remaining = int(decoded[:start], 16)
- chunk = buf[start + 2:] # Add the length of the CRLF pair.
- remaining -= len(chunk)
-
- while remaining > 0:
- balance = sock.recv(remaining + 2) # Add the length of the chunk's CRLF pair.
- if balance:
- chunk += balance
- remaining -= len(balance)
- # If necessary, remove the trailing CRLF pair. (This precludes an extra trip through the JSON parser.)
- return chunk[:-2] if remaining == -2 and chunk[-2] == 0x0d and chunk[-1] == 0x0a else chunk
- return b''
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 = ''
+ 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()
continue
except ValueError as e:
- if self.block:
- pass
- else:
- yield None
- # this is a non-blocking read (ie, it will return if any data is available)
+ if self.block: pass
+ else: yield None
try:
- if self.timeout:
+ buf = buf.lstrip() # Remove any keep-alive delimiters to detect hangups.
+ if self.timeout and not buf: # This is a non-blocking read.
ready_to_read = select.select([sock], [], [], self.timeout)
- if ready_to_read[0]:
- self.buf += self.recv_chunk(sock)
- if time.time() - self.timer > self.timeout:
- yield {"timeout":True}
- else:
- yield {"timeout":True}
- else:
- self.buf += self.recv_chunk(sock)
+ if not ready_to_read[0] and time.time() - timer > self.timeout:
+ yield {'timeout': True}
+ continue
+ timer = time.time()
+ buf += recv_chunk(sock).decode('utf-8')
+ if not buf:
+ yield {'hangup': True}
+ break
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
- except urllib_error.HTTPError as e:
- raise TwitterHTTPError(e, self.uri, 'json', self.arg_data)
+ # 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):
projects / z_archive / twitter.git / blobdiff