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from .. import utils, odict, tcp
from frame import *
# "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"
CLIENT_CONNECTION_PREFACE = '505249202a20485454502f322e300d0a0d0a534d0d0a0d0a'
ERROR_CODES = utils.BiDi(
NO_ERROR=0x0,
PROTOCOL_ERROR=0x1,
INTERNAL_ERROR=0x2,
FLOW_CONTROL_ERROR=0x3,
SETTINGS_TIMEOUT=0x4,
STREAM_CLOSED=0x5,
FRAME_SIZE_ERROR=0x6,
REFUSED_STREAM=0x7,
CANCEL=0x8,
COMPRESSION_ERROR=0x9,
CONNECT_ERROR=0xa,
ENHANCE_YOUR_CALM=0xb,
INADEQUATE_SECURITY=0xc,
HTTP_1_1_REQUIRED=0xd
)
class H2Client(tcp.TCPClient):
ALPN_PROTO_H2 = b'h2'
DEFAULT_SETTINGS = {
SettingsFrame.SETTINGS.SETTINGS_HEADER_TABLE_SIZE: 4096,
SettingsFrame.SETTINGS.SETTINGS_ENABLE_PUSH: 1,
SettingsFrame.SETTINGS.SETTINGS_MAX_CONCURRENT_STREAMS: None,
SettingsFrame.SETTINGS.SETTINGS_INITIAL_WINDOW_SIZE: 2 ^ 16 - 1,
SettingsFrame.SETTINGS.SETTINGS_MAX_FRAME_SIZE: 2 ^ 14,
SettingsFrame.SETTINGS.SETTINGS_MAX_HEADER_LIST_SIZE: None,
}
def __init__(self, address, source_address=None):
super(H2Client, self).__init__(address, source_address)
self.settings = self.DEFAULT_SETTINGS.copy()
def connect(self, send_preface=True):
super(H2Client, self).connect()
self.convert_to_ssl(alpn_protos=[self.ALPN_PROTO_H2])
alp = self.get_alpn_proto_negotiated()
if alp != b'h2':
raise NotImplementedError("H2Client can not handle unknown protocol: %s" % alp)
print "-> Successfully negotiated 'h2' application layer protocol."
if send_preface:
self.wfile.write(bytes(CLIENT_CONNECTION_PREFACE.decode('hex')))
self.send_frame(SettingsFrame())
frame = Frame.from_file(self.rfile)
print frame.human_readable()
assert isinstance(frame, SettingsFrame)
self.apply_settings(frame.settings)
print "-> Connection Preface completed."
print "-> H2Client is ready..."
def send_frame(self, frame):
self.wfile.write(frame.to_bytes())
self.wfile.flush()
def read_frame(self):
frame = Frame.from_file(self.rfile)
if isinstance(frame, SettingsFrame):
self.apply_settings(frame.settings)
return frame
def apply_settings(self, settings):
for setting, value in settings.items():
old_value = self.settings[setting]
if not old_value:
old_value = '-'
self.settings[setting] = value
print "-> Setting changed: %s to %d (was %s)" %
(SettingsFrame.SETTINGS.get_name(setting), value, str(old_value))
self.send_frame(SettingsFrame(flags=Frame.FLAG_ACK))
print "-> New settings acknowledged."
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