http2: change header_block_fragment handling
This commit is contained in:
Thomas Kriechbaumer
parent
5cecbdc168
commit
40fa113116
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@ -48,13 +48,21 @@ class Frame(object):
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self.flags = flags
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self.stream_id = stream_id
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def _check_frame_size(self, length):
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max_length = self.state.http2_settings[
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SettingsFrame.SETTINGS.SETTINGS_MAX_FRAME_SIZE]
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if length > max_length:
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@classmethod
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def _check_frame_size(self, length, state):
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from . import HTTP2Protocol
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if state:
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settings = state.http2_settings
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else:
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settings = HTTP2Protocol.HTTP2_DEFAULT_SETTINGS
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max_frame_size = settings[SettingsFrame.SETTINGS.SETTINGS_MAX_FRAME_SIZE]
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if length > max_frame_size:
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raise NotImplementedError(
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"Frame size exceeded: %d, but only %d allowed." % (
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length, max_length))
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length, max_frame_size))
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@classmethod
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def from_file(self, fp, state=None):
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@ -70,7 +78,7 @@ class Frame(object):
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flags = fields[3]
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stream_id = fields[4]
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# TODO: check frame size if <= current SETTINGS_MAX_FRAME_SIZE
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self._check_frame_size(length, state)
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payload = fp.safe_read(length)
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return FRAMES[fields[2]].from_bytes(
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@ -80,26 +88,11 @@ class Frame(object):
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stream_id,
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payload)
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@classmethod
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def from_bytes(self, data, state=None):
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fields = struct.unpack("!HBBBL", data[:9])
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length = (fields[0] << 8) + fields[1]
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# type is already deducted from class
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flags = fields[3]
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stream_id = fields[4]
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return FRAMES[fields[2]].from_bytes(
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state,
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length,
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flags,
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stream_id,
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data[9:])
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def to_bytes(self):
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payload = self.payload_bytes()
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self.length = len(payload)
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self._check_frame_size(self.length)
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self._check_frame_size(self.length, self.state)
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b = struct.pack('!HB', self.length & 0xFFFF00, self.length & 0x0000FF)
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b += struct.pack('!B', self.TYPE)
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@ -192,17 +185,14 @@ class HeadersFrame(Frame):
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length=0,
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flags=Frame.FLAG_NO_FLAGS,
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stream_id=0x0,
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headers=None,
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header_block_fragment=b'',
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pad_length=0,
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exclusive=False,
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stream_dependency=0x0,
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weight=0):
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super(HeadersFrame, self).__init__(state, length, flags, stream_id)
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if headers is None:
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headers = []
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self.headers = headers
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self.header_block_fragment = header_block_fragment
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self.pad_length = pad_length
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self.exclusive = exclusive
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self.stream_dependency = stream_dependency
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@ -220,23 +210,14 @@ class HeadersFrame(Frame):
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if f.flags & self.FLAG_PRIORITY:
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f.stream_dependency, f.weight = struct.unpack(
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'!LB', header_block_fragment[:5])
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'!LB', f.header_block_fragment[:5])
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f.exclusive = bool(f.stream_dependency >> 31)
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f.stream_dependency &= 0x7FFFFFFF
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f.header_block_fragment = f.header_block_fragment[5:]
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# TODO only do this if END_HEADERS or something...
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# for header, value in f.state.decoder.decode(f.header_block_fragment):
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# f.headers.append((header, value))
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return f
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def payload_bytes(self):
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"""
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This encodes all headers with HPACK
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Do NOT call this method twice - it will change the encoder state!
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"""
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if self.stream_id == 0x0:
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raise ValueError('HEADERS frames MUST be associated with a stream.')
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@ -249,9 +230,7 @@ class HeadersFrame(Frame):
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(int(self.exclusive) << 31) | self.stream_dependency,
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self.weight)
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# TODO: maybe remove that and only deal with header_block_fragments
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# inside frames
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b += self.state.encoder.encode(self.headers)
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b += self.header_block_fragment
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if self.flags & self.FLAG_PADDED:
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b += b'\0' * self.pad_length
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@ -269,11 +248,7 @@ class HeadersFrame(Frame):
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if self.flags & self.FLAG_PADDED:
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s.append("padding: %d" % self.pad_length)
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if not self.headers:
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s.append("headers: None")
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else:
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for header, value in self.headers:
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s.append("%s: %s" % (header, value))
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s.append("header_block_fragment: %s" % self.header_block_fragment.encode('hex'))
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return "\n".join(s)
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@ -3,6 +3,22 @@ import tutils
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from nose.tools import assert_equal
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class FileAdapter(object):
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def __init__(self, data, is_hex=True):
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self.position = 0
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if is_hex:
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self.data = data.decode('hex')
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else:
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self.data = data
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def safe_read(self, length):
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if self.position + length > len(self.data):
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raise ValueError("not enough bytes to read")
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value = self.data[self.position:self.position + length]
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self.position += length
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return value
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def test_invalid_flags():
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tutils.raises(
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@ -26,14 +42,6 @@ def test_frame_equality():
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payload='foobar')
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assert_equal(a, b)
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def test_too_large_frames():
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DataFrame(
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length=6,
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flags=Frame.FLAG_END_STREAM,
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stream_id=0x1234567)
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def test_data_frame_to_bytes():
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f = DataFrame(
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length=6,
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@ -61,7 +69,7 @@ def test_data_frame_to_bytes():
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def test_data_frame_from_bytes():
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f = Frame.from_bytes('000006000101234567666f6f626172'.decode('hex'))
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f = Frame.from_file(FileAdapter('000006000101234567666f6f626172'))
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assert isinstance(f, DataFrame)
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assert_equal(f.length, 6)
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assert_equal(f.TYPE, DataFrame.TYPE)
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@ -69,7 +77,7 @@ def test_data_frame_from_bytes():
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assert_equal(f.stream_id, 0x1234567)
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assert_equal(f.payload, 'foobar')
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f = Frame.from_bytes('00000a00090123456703666f6f626172000000'.decode('hex'))
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f = Frame.from_file(FileAdapter('00000a00090123456703666f6f626172000000'))
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assert isinstance(f, DataFrame)
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assert_equal(f.length, 10)
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assert_equal(f.TYPE, DataFrame.TYPE)
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@ -93,14 +101,14 @@ def test_headers_frame_to_bytes():
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length=6,
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flags=(Frame.FLAG_NO_FLAGS),
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stream_id=0x1234567,
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headers=[('host', 'foo.bar')])
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header_block_fragment='668594e75e31d9'.decode('hex'))
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assert_equal(f.to_bytes().encode('hex'), '000007010001234567668594e75e31d9')
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f = HeadersFrame(
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length=10,
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flags=(HeadersFrame.FLAG_PADDED),
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stream_id=0x1234567,
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headers=[('host', 'foo.bar')],
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header_block_fragment='668594e75e31d9'.decode('hex'),
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pad_length=3)
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assert_equal(
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f.to_bytes().encode('hex'),
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@ -110,7 +118,7 @@ def test_headers_frame_to_bytes():
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length=10,
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flags=(HeadersFrame.FLAG_PRIORITY),
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stream_id=0x1234567,
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headers=[('host', 'foo.bar')],
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header_block_fragment='668594e75e31d9'.decode('hex'),
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exclusive=True,
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stream_dependency=0x7654321,
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weight=42)
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@ -122,7 +130,7 @@ def test_headers_frame_to_bytes():
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length=14,
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flags=(HeadersFrame.FLAG_PADDED | HeadersFrame.FLAG_PRIORITY),
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stream_id=0x1234567,
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headers=[('host', 'foo.bar')],
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header_block_fragment='668594e75e31d9'.decode('hex'),
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pad_length=3,
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exclusive=True,
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stream_dependency=0x7654321,
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@ -135,7 +143,7 @@ def test_headers_frame_to_bytes():
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length=14,
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flags=(HeadersFrame.FLAG_PADDED | HeadersFrame.FLAG_PRIORITY),
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stream_id=0x1234567,
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headers=[('host', 'foo.bar')],
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header_block_fragment='668594e75e31d9'.decode('hex'),
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pad_length=3,
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exclusive=False,
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stream_dependency=0x7654321,
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@ -148,60 +156,61 @@ def test_headers_frame_to_bytes():
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length=6,
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flags=Frame.FLAG_NO_FLAGS,
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stream_id=0x0,
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headers=[('host', 'foo.bar')])
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header_block_fragment='668594e75e31d9'.decode('hex'))
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tutils.raises(ValueError, f.to_bytes)
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def test_headers_frame_from_bytes():
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f = Frame.from_bytes('000007010001234567668594e75e31d9'.decode('hex'))
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f = Frame.from_file(FileAdapter(
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'000007010001234567668594e75e31d9'))
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assert isinstance(f, HeadersFrame)
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assert_equal(f.length, 7)
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assert_equal(f.TYPE, HeadersFrame.TYPE)
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assert_equal(f.flags, Frame.FLAG_NO_FLAGS)
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assert_equal(f.stream_id, 0x1234567)
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assert_equal(f.headers, [('host', 'foo.bar')])
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assert_equal(f.header_block_fragment, '668594e75e31d9'.decode('hex'))
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f = Frame.from_bytes(
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'00000b01080123456703668594e75e31d9000000'.decode('hex'))
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f = Frame.from_file(FileAdapter(
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'00000b01080123456703668594e75e31d9000000'))
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assert isinstance(f, HeadersFrame)
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assert_equal(f.length, 11)
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assert_equal(f.TYPE, HeadersFrame.TYPE)
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assert_equal(f.flags, HeadersFrame.FLAG_PADDED)
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assert_equal(f.stream_id, 0x1234567)
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assert_equal(f.headers, [('host', 'foo.bar')])
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assert_equal(f.header_block_fragment, '668594e75e31d9'.decode('hex'))
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f = Frame.from_bytes(
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'00000c012001234567876543212a668594e75e31d9'.decode('hex'))
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f = Frame.from_file(FileAdapter(
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'00000c012001234567876543212a668594e75e31d9'))
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assert isinstance(f, HeadersFrame)
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assert_equal(f.length, 12)
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assert_equal(f.TYPE, HeadersFrame.TYPE)
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assert_equal(f.flags, HeadersFrame.FLAG_PRIORITY)
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assert_equal(f.stream_id, 0x1234567)
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assert_equal(f.headers, [('host', 'foo.bar')])
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assert_equal(f.header_block_fragment, '668594e75e31d9'.decode('hex'))
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assert_equal(f.exclusive, True)
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assert_equal(f.stream_dependency, 0x7654321)
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assert_equal(f.weight, 42)
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f = Frame.from_bytes(
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'00001001280123456703876543212a668594e75e31d9000000'.decode('hex'))
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f = Frame.from_file(FileAdapter(
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'00001001280123456703876543212a668594e75e31d9000000'))
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assert isinstance(f, HeadersFrame)
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assert_equal(f.length, 16)
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assert_equal(f.TYPE, HeadersFrame.TYPE)
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assert_equal(f.flags, HeadersFrame.FLAG_PADDED | HeadersFrame.FLAG_PRIORITY)
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assert_equal(f.stream_id, 0x1234567)
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assert_equal(f.headers, [('host', 'foo.bar')])
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assert_equal(f.header_block_fragment, '668594e75e31d9'.decode('hex'))
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assert_equal(f.exclusive, True)
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assert_equal(f.stream_dependency, 0x7654321)
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assert_equal(f.weight, 42)
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f = Frame.from_bytes(
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'00001001280123456703076543212a668594e75e31d9000000'.decode('hex'))
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f = Frame.from_file(FileAdapter(
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'00001001280123456703076543212a668594e75e31d9000000'))
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assert isinstance(f, HeadersFrame)
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assert_equal(f.length, 16)
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assert_equal(f.TYPE, HeadersFrame.TYPE)
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assert_equal(f.flags, HeadersFrame.FLAG_PADDED | HeadersFrame.FLAG_PRIORITY)
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assert_equal(f.stream_id, 0x1234567)
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assert_equal(f.headers, [('host', 'foo.bar')])
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assert_equal(f.header_block_fragment, '668594e75e31d9'.decode('hex'))
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assert_equal(f.exclusive, False)
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assert_equal(f.stream_dependency, 0x7654321)
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assert_equal(f.weight, 42)
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@ -212,7 +221,7 @@ def test_headers_frame_human_readable():
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length=7,
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flags=(HeadersFrame.FLAG_PADDED | HeadersFrame.FLAG_PRIORITY),
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stream_id=0x1234567,
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headers=[],
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header_block_fragment=b'',
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pad_length=3,
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exclusive=False,
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stream_dependency=0x7654321,
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@ -223,7 +232,7 @@ def test_headers_frame_human_readable():
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length=14,
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flags=(HeadersFrame.FLAG_PADDED | HeadersFrame.FLAG_PRIORITY),
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stream_id=0x1234567,
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headers=[('host', 'foo.bar')],
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header_block_fragment='668594e75e31d9'.decode('hex'),
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pad_length=3,
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exclusive=False,
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stream_dependency=0x7654321,
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@ -266,7 +275,7 @@ def test_priority_frame_to_bytes():
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def test_priority_frame_from_bytes():
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f = Frame.from_bytes('000005020001234567876543212a'.decode('hex'))
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f = Frame.from_file(FileAdapter('000005020001234567876543212a'))
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assert isinstance(f, PriorityFrame)
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assert_equal(f.length, 5)
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assert_equal(f.TYPE, PriorityFrame.TYPE)
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@ -276,7 +285,7 @@ def test_priority_frame_from_bytes():
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assert_equal(f.stream_dependency, 0x7654321)
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assert_equal(f.weight, 42)
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f = Frame.from_bytes('0000050200012345670765432115'.decode('hex'))
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f = Frame.from_file(FileAdapter('0000050200012345670765432115'))
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assert isinstance(f, PriorityFrame)
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assert_equal(f.length, 5)
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assert_equal(f.TYPE, PriorityFrame.TYPE)
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@ -314,7 +323,7 @@ def test_rst_stream_frame_to_bytes():
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def test_rst_stream_frame_from_bytes():
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f = Frame.from_bytes('00000403000123456707654321'.decode('hex'))
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f = Frame.from_file(FileAdapter('00000403000123456707654321'))
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assert isinstance(f, RstStreamFrame)
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assert_equal(f.length, 4)
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assert_equal(f.TYPE, RstStreamFrame.TYPE)
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@ -372,21 +381,21 @@ def test_settings_frame_to_bytes():
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def test_settings_frame_from_bytes():
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f = Frame.from_bytes('000000040000000000'.decode('hex'))
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f = Frame.from_file(FileAdapter('000000040000000000'))
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assert isinstance(f, SettingsFrame)
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assert_equal(f.length, 0)
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assert_equal(f.TYPE, SettingsFrame.TYPE)
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assert_equal(f.flags, Frame.FLAG_NO_FLAGS)
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assert_equal(f.stream_id, 0x0)
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f = Frame.from_bytes('000000040100000000'.decode('hex'))
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f = Frame.from_file(FileAdapter('000000040100000000'))
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assert isinstance(f, SettingsFrame)
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assert_equal(f.length, 0)
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assert_equal(f.TYPE, SettingsFrame.TYPE)
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assert_equal(f.flags, SettingsFrame.FLAG_ACK)
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assert_equal(f.stream_id, 0x0)
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f = Frame.from_bytes('000006040100000000000200000001'.decode('hex'))
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f = Frame.from_file(FileAdapter('000006040100000000000200000001'))
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assert isinstance(f, SettingsFrame)
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assert_equal(f.length, 6)
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assert_equal(f.TYPE, SettingsFrame.TYPE)
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@ -395,8 +404,8 @@ def test_settings_frame_from_bytes():
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assert_equal(len(f.settings), 1)
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assert_equal(f.settings[SettingsFrame.SETTINGS.SETTINGS_ENABLE_PUSH], 1)
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f = Frame.from_bytes(
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'00000c040000000000000200000001000312345678'.decode('hex'))
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f = Frame.from_file(FileAdapter(
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'00000c040000000000000200000001000312345678'))
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assert isinstance(f, SettingsFrame)
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assert_equal(f.length, 12)
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assert_equal(f.TYPE, SettingsFrame.TYPE)
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@ -466,7 +475,7 @@ def test_push_promise_frame_to_bytes():
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def test_push_promise_frame_from_bytes():
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f = Frame.from_bytes('00000a05000123456707654321666f6f626172'.decode('hex'))
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f = Frame.from_file(FileAdapter('00000a05000123456707654321666f6f626172'))
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assert isinstance(f, PushPromiseFrame)
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assert_equal(f.length, 10)
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assert_equal(f.TYPE, PushPromiseFrame.TYPE)
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@ -474,8 +483,8 @@ def test_push_promise_frame_from_bytes():
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assert_equal(f.stream_id, 0x1234567)
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assert_equal(f.header_block_fragment, 'foobar')
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f = Frame.from_bytes(
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'00000e0508012345670307654321666f6f626172000000'.decode('hex'))
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f = Frame.from_file(FileAdapter(
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'00000e0508012345670307654321666f6f626172000000'))
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assert isinstance(f, PushPromiseFrame)
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assert_equal(f.length, 14)
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||||
assert_equal(f.TYPE, PushPromiseFrame.TYPE)
|
||||
|
|
@ -522,7 +531,7 @@ def test_ping_frame_to_bytes():
|
|||
|
||||
|
||||
def test_ping_frame_from_bytes():
|
||||
f = Frame.from_bytes('000008060100000000666f6f6261720000'.decode('hex'))
|
||||
f = Frame.from_file(FileAdapter('000008060100000000666f6f6261720000'))
|
||||
assert isinstance(f, PingFrame)
|
||||
assert_equal(f.length, 8)
|
||||
assert_equal(f.TYPE, PingFrame.TYPE)
|
||||
|
|
@ -530,7 +539,7 @@ def test_ping_frame_from_bytes():
|
|||
assert_equal(f.stream_id, 0x0)
|
||||
assert_equal(f.payload, b'foobar\0\0')
|
||||
|
||||
f = Frame.from_bytes('000008060000000000666f6f6261726465'.decode('hex'))
|
||||
f = Frame.from_file(FileAdapter('000008060000000000666f6f6261726465'))
|
||||
assert isinstance(f, PingFrame)
|
||||
assert_equal(f.length, 8)
|
||||
assert_equal(f.TYPE, PingFrame.TYPE)
|
||||
|
|
@ -581,8 +590,8 @@ def test_goaway_frame_to_bytes():
|
|||
|
||||
|
||||
def test_goaway_frame_from_bytes():
|
||||
f = Frame.from_bytes(
|
||||
'0000080700000000000123456787654321'.decode('hex'))
|
||||
f = Frame.from_file(FileAdapter(
|
||||
'0000080700000000000123456787654321'))
|
||||
assert isinstance(f, GoAwayFrame)
|
||||
assert_equal(f.length, 8)
|
||||
assert_equal(f.TYPE, GoAwayFrame.TYPE)
|
||||
|
|
@ -592,8 +601,8 @@ def test_goaway_frame_from_bytes():
|
|||
assert_equal(f.error_code, 0x87654321)
|
||||
assert_equal(f.data, b'')
|
||||
|
||||
f = Frame.from_bytes(
|
||||
'00000e0700000000000123456787654321666f6f626172'.decode('hex'))
|
||||
f = Frame.from_file(FileAdapter(
|
||||
'00000e0700000000000123456787654321666f6f626172'))
|
||||
assert isinstance(f, GoAwayFrame)
|
||||
assert_equal(f.length, 14)
|
||||
assert_equal(f.TYPE, GoAwayFrame.TYPE)
|
||||
|
|
@ -642,7 +651,7 @@ def test_window_update_frame_to_bytes():
|
|||
|
||||
|
||||
def test_window_update_frame_from_bytes():
|
||||
f = Frame.from_bytes('00000408000000000001234567'.decode('hex'))
|
||||
f = Frame.from_file(FileAdapter('00000408000000000001234567'))
|
||||
assert isinstance(f, WindowUpdateFrame)
|
||||
assert_equal(f.length, 4)
|
||||
assert_equal(f.TYPE, WindowUpdateFrame.TYPE)
|
||||
|
|
@ -677,7 +686,7 @@ def test_continuation_frame_to_bytes():
|
|||
|
||||
|
||||
def test_continuation_frame_from_bytes():
|
||||
f = Frame.from_bytes('000006090401234567666f6f626172'.decode('hex'))
|
||||
f = Frame.from_file(FileAdapter('000006090401234567666f6f626172'))
|
||||
assert isinstance(f, ContinuationFrame)
|
||||
assert_equal(f.length, 6)
|
||||
assert_equal(f.TYPE, ContinuationFrame.TYPE)
|
||||
|
|
|
|||
Loading…
Reference in New Issue