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import logging
import asyncio
import struct
import qpack
from siridb.connector import SiriDBProtocol
from siridb.connector.lib.connection import SiriDBAsyncConnection
class Package:
__slots__ = ('pid', 'length', 'tipe', 'checkbit', 'data')
struct_datapackage = struct.Struct('<IHBB')
def __init__(self, barray):
self.length, self.pid, self.tipe, self.checkbit = \
self.__class__.struct_datapackage.unpack_from(barray, offset=0)
self.length += self.__class__.struct_datapackage.size
self.data = None
def extract_data_from(self, barray):
try:
self.data = qpack.unpackb(
barray[self.__class__.struct_datapackage.size:self.length],
decode='utf-8')
finally:
del barray[:self.length]
class SiriDBServerProtocol(asyncio.Protocol):
def __init__(self, on_package_received):
self._buffered_data = bytearray()
self._data_package = None
self._on_package_received = on_package_received
def data_received(self, data):
'''
override asyncio.Protocol
'''
self._buffered_data.extend(data)
while self._buffered_data:
size = len(self._buffered_data)
if self._data_package is None:
if size < Package.struct_datapackage.size:
return None
self._data_package = Package(self._buffered_data)
if size < self._data_package.length:
return None
try:
self._data_package.extract_data_from(self._buffered_data)
except KeyError as e:
logging.error('Unsupported package received: {}'.format(e))
except Exception as e:
logging.exception(e)
# empty the byte-array to recover from this error
self._buffered_data.clear()
else:
self._on_package_received(self._data_package.data)
self._data_package = None
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