Logger.__enter__() - Code Metrics - Inspection of "Add logging" - half2me/libant - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#3)

unknown

created 2016-10-06 14:03 UTC

Logger.enter() A

↳ Parent: Project

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Lines	0
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Importance

Changes	1
Bugs	1	Features	0

Metric	Value
cc	1
c	1
b	1
f	0
dl	0
loc	3
rs	10

from abc import abstractmethod
from queue import Queue, Empty
from threading import Lock, Thread, Event

import math
from serial import Serial, SerialException, SerialTimeoutException

import usb
import time
from struct import *
import os

from libAnt.constants import MESSAGE_TX_SYNC, MESSAGE_CHANNEL_BROADCAST_DATA
from libAnt.message import Message, SystemResetMessage


class DriverException(Exception):
    pass

class Logger:
    def __init__(self, logFile: str):
        self._logFile = logFile
        self._log = None

    def __enter__(self):
        self.open()
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        self.close()

    def open(self):
        if self._log is not None:
            self.close()
        self._log = open(self._logFile, 'wb')
        self.onOpen()

    def close(self):
        if self._log is not None:
            self.beforeClose()
            self._log.close()
            self.afterClose()

    def log(self, data: bytes):
        self._log.write(self.encodeData(data))

    def onOpen(self):
        pass

    def beforeClose(self):
        pass

    def afterClose(self):
        pass

    def encodeData(self, data):
        return data

class PcapLogger(Logger):
    def onOpen(self):
        # write pcap global header
        magic_number = b'\xD4\xC3\xB2\xA1'
        version_major = 2
        version_minor = 4
        thiszone = b'\x00\x00\x00\x00'
        sigfigs = b'\x00\x00\x00\x00'
        snaplen = b'\xFF\x00\x00\x00'
        network = b'\x01\x00\x00\x00'
        pcap_global_header = Struct('<4shh4s4s4s4s')
        self._log.write(
            pcap_global_header.pack(magic_number, version_major, version_minor, thiszone, sigfigs,
                                    snaplen, network))

    def encodeData(self, data):
        timestamp = time.time()
        frac, whole = math.modf(timestamp)

        ts_sec = int(whole).to_bytes(4, byteorder='little')
        ts_usec = int(frac * 1000 * 1000).to_bytes(4, byteorder='little')
        incl_len = len(data)
        orig_len = incl_len

        pcap_packet_header = Struct('<4s4sll').pack(ts_sec, ts_usec, incl_len, orig_len)
        return pcap_packet_header + data

class Driver:
    """
    The driver provides an interface to read and write raw data to and from an ANT+ capable hardware device
    """

    def __init__(self, logger: Logger = None):
        self._lock = Lock()
        self._logger = logger
        self._openTime = None

    def __enter__(self):
        self.open()
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        self.close()

    def isOpen(self) -> bool:
        with self._lock:
            return self._isOpen()

    def open(self) -> None:
        with self._lock:
            if not self._isOpen():
                self._openTime = time.time()
                if self._logger is not None:
                    self._logger.open()
                self._open()

    def close(self) -> None:
        with self._lock:
            if self._isOpen:
                self._close()
                if self._logger is not None:
                    self._logger.close()

    def reOpen(self) -> None:
        with self._lock:
            if self._isOpen():
                self._close()
            self._open()

    def read(self, timeout=None) -> Message:
        # Splits the string into a list of tokens every n characters
        def splitN(str1, n):
            return [str1[start:start + n] for start in range(0, len(str1), n)]

        if not self.isOpen():
            raise DriverException("Device is closed")

        with self._lock:
            while True:
                sync = self._read(1, timeout=timeout)[0]
                if sync is not MESSAGE_TX_SYNC:
                    continue
                length = self._read(1, timeout=timeout)[0]
                type = self._read(1, timeout=timeout)[0]
                data = self._read(length, timeout=timeout)
                chk = self._read(1, timeout=timeout)[0]
                msg = Message(type, data)

                if self._logger:
                    logMsg = bytearray([sync, length, type])
                    logMsg.extend(data)
                    logMsg.append(chk)

                    self._logger.log(bytes(logMsg))

                if msg.checksum() == chk:
                    return msg

    def write(self, msg: Message) -> None:
        if not self.isOpen():
            raise DriverException("Device is closed")

        with self._lock:
            self._write(msg.encode())

    @abstractmethod
    def _isOpen(self) -> bool:
        pass

    @abstractmethod
    def _open(self) -> None:
        pass

    @abstractmethod
    def _close(self) -> None:
        pass

    @abstractmethod
    def _read(self, count: int, timeout=None) -> bytes:
        pass

    @abstractmethod
    def _write(self, data: bytes) -> None:
        pass


class SerialDriver(Driver):
    """
    An implementation of a serial ANT+ device driver
    """

    def __init__(self, device: str, baudRate: int = 115200, logger: Logger = None):
        super().__init__(logger=logger)
        self._device = device
        self._baudRate = baudRate
        self._serial = None

    def __str__(self):
        if self.isOpen():
            return self._device + " @ " + str(self._baudRate)
        return None

    def _isOpen(self) -> bool:
        return self._serial is None

    def _open(self) -> None:
        try:
            self._serial = Serial(self._device, self._baudRate)
        except SerialException as e:
            raise DriverException(str(e))

        if not self._serial.isOpen():
            raise DriverException("Could not open specified device")

    def _close(self) -> None:
        self._serial.close()
        self._serial = None

    def _read(self, count: int, timeout=None) -> bytes:
        return self._serial.read(count, timeout=timeout)

    def _write(self, data: bytes) -> None:
        try:
            self._serial.write(data)
            self._serial.flush()
        except SerialTimeoutException as e:
            raise DriverException(str(e))


class USBDriver(Driver):
    """
    An implementation of a USB ANT+ device driver
    """

    def __init__(self, vid, pid, logger: Logger = None):
        super().__init__(logger=logger)
        self._idVendor = vid
        self._idProduct = pid
        self._dev = None
        self._epOut = None
        self._epIn = None
        self._interfaceNumber = None
        self._packetSize = 0x20
        self._queue = None
        self._loop = None
        self._driver_open = False

    def __str__(self):
        if self.isOpen():
            return str(self._dev)
        return "Closed"

    class USBLoop(Thread):
        def __init__(self, ep, packetSize: int, queue: Queue):
            super().__init__()
            self._stopper = Event()
            self._ep = ep
            self._packetSize = packetSize
            self._queue = queue

        def stop(self) -> None:
            self._stopper.set()

        def run(self) -> None:
            while not self._stopper.is_set():
                try:
                    data = self._ep.read(self._packetSize, timeout=1000)
                    for d in data:
                        self._queue.put(d)
                except usb.core.USBError as e:
                    if e.errno not in (60, 110) and e.backend_error_code != -116:  # Timout errors
                        self._stopper.set()
            # We Put in an invalid byte so threads will realize the device is stopped
            self._queue.put(None)

    def _isOpen(self) -> bool:
        return self._driver_open

    def _open(self) -> None:
        print('USB OPEN START')
        try:
            # find the first USB device that matches the filter
            self._dev = usb.core.find(idVendor=self._idVendor, idProduct=self._idProduct)

            if self._dev is None:
                raise DriverException("Could not open specified device")

            # Detach kernel driver
            try:
                if self._dev.is_kernel_driver_active(0):
                    try:
                        self._dev.detach_kernel_driver(0)
                    except usb.USBError as e:
                        raise DriverException("Could not detach kernel driver")
            except NotImplementedError:
                pass  # for non unix systems

            # set the active configuration. With no arguments, the first
            # configuration will be the active one
            self._dev.set_configuration()

            # get an endpoint instance
            cfg = self._dev.get_active_configuration()
            self._interfaceNumber = cfg[(0, 0)].bInterfaceNumber
            interface = usb.util.find_descriptor(cfg, bInterfaceNumber=self._interfaceNumber,
                                                 bAlternateSetting=usb.control.get_interface(self._dev,
                                                                                             self._interfaceNumber))
            usb.util.claim_interface(self._dev, self._interfaceNumber)

            self._epOut = usb.util.find_descriptor(interface, custom_match=lambda e: usb.util.endpoint_direction(
                e.bEndpointAddress) == usb.ENDPOINT_OUT)

            self._epIn = usb.util.find_descriptor(interface, custom_match=lambda e: usb.util.endpoint_direction(
                e.bEndpointAddress) == usb.ENDPOINT_IN)

            if self._epOut is None or self._epIn is None:
                raise DriverException("Could not initialize USB endpoint")

            self._queue = Queue()
            self._loop = self.USBLoop(self._epIn, self._packetSize, self._queue)
            self._loop.start()
            self._driver_open = True
            print('USB OPEN SUCCESS')
        except IOError as e:
            self._close()
            raise DriverException(str(e))

    def _close(self) -> None:
        print('USB CLOSE START')
        if self._loop is not None:
            if self._loop.is_alive():
                self._loop.stop()
                self._loop.join()
        self._loop = None
        try:
            self._dev.reset()
            usb.util.dispose_resources(self._dev)
        except:
            pass
        self._dev = self._epOut = self._epIn = None
        self._driver_open = False
        print('USB CLOSE END')

    def _read(self, count: int, timeout=None) -> bytes:
        data = bytearray()
        for i in range(0, count):
            b = self._queue.get(timeout=timeout)
            if b is None:
                self._close()
                raise DriverException("Device is closed!")
            data.append(b)
        return bytes(data)

    def _write(self, data: bytes) -> None:
        return self._epOut.write(data)


class DummyDriver(Driver):
    def __init__(self, logger: Logger = None):
        super().__init__(logger=logger)
        self._isopen = False
        self._data = Queue()
        msg1 = Message(MESSAGE_CHANNEL_BROADCAST_DATA, b'\x00\x01\x02\x03\x04\x05\x06\x07').encode()
        for b in msg1:
            self._data.put(b)
        msg2 = Message(MESSAGE_CHANNEL_BROADCAST_DATA, b'\x00\xF1\xF2\xF3\xF4\xF5\xF6\xF7').encode()
        for b in msg2:
            self._data.put(b)
        msg3 = Message(MESSAGE_CHANNEL_BROADCAST_DATA, b'\x00\xF9\xFA\xFB\xFC\xFD\xFE\xFF').encode()
        for b in msg3:
            self._data.put(b)

    def _isOpen(self) -> bool:
        return self._isopen

    def _close(self) -> None:
        self._isopen = False

    def _read(self, count: int, timeout=None) -> bytes:
        data = bytearray()
        for i in range(0, count):
            data.append(self._data.get(timeout=timeout))
        return bytes(data)

    def _open(self) -> None:
        self._isopen = True

    def _write(self, data: bytes) -> None:
        pass


class PcapDriver(Driver):
    def __init__(self, pcap, logger: Logger = None):
        super().__init__(logger=logger)
        self._isopen = False
        self._pcap = pcap
        self._buffer = Queue()

        self._loop = None

    class PcapLoop(Thread):
        def __init__(self, pcap, buffer: Queue):
            super().__init__()
            self._stopper = Event()
            self._pcap = pcap
            self._buffer = buffer

        def stop(self) -> None:
            self._stopper.set()

        def run(self) -> None:
            self._pcapfile = open(self._pcap, 'rb')
            self._EOF = os.stat(self._pcap).st_size
            # move file pointer to first packet header
            global_header_length = 24
            self._pcapfile.seek(global_header_length, 0)

            first_ts = 0
            start_time = time.time()
            while not self._stopper.is_set():
                if self._pcapfile.tell() is self._EOF:
                    continue

                ts_sec, = unpack('i', self._pcapfile.read(4))
                ts_usec = unpack('i', self._pcapfile.read(4))[0] / 1000000

                if first_ts is 0:
                    first_ts = ts_sec + ts_usec

                ts = ts_sec + ts_usec
                send_time = ts - first_ts
                elapsed_time = time.time() - start_time
                if send_time > (elapsed_time):
                    sleep_time = send_time - elapsed_time
                    time.sleep(sleep_time)

                packet_length = unpack('i', self._pcapfile.read(4))[0]
                self._pcapfile.seek(4, 1)
                for i in range(packet_length):
                    self._buffer.put(self._pcapfile.read(1))

            self._pcapfile.close()

    def _isOpen(self) -> bool:
        return self._isopen

    def _open(self) -> None:
        self._isopen = True
        self._loop = self.PcapLoop(self._pcap, self._buffer)
        self._loop.start()

    def _close(self) -> None:
        self._isopen = False
        if self._loop is not None:
            if self._loop.is_alive():
                self._loop.stop()
                self._loop.join()
        self._loop = None

    def _read(self, count: int, timeout=None) -> bytes:
        result = bytearray()

        while len(result) < count:
            result += self._buffer.get(block=True, timeout=timeout)

        return bytes(result)

    def _write(self, data: bytes) -> None:
        pass


1			from abc import abstractmethod
2			from queue import Queue, Empty
3			from threading import Lock, Thread, Event
4
5			import math
6			from serial import Serial, SerialException, SerialTimeoutException
7
8			import usb
9			import time
10			from struct import *
11			import os
12
13			from libAnt.constants import MESSAGE_TX_SYNC, MESSAGE_CHANNEL_BROADCAST_DATA
14			from libAnt.message import Message, SystemResetMessage
15
16
17			class DriverException(Exception):
18			pass
19
20			class Logger:
21			def __init__(self, logFile: str):
22			self._logFile = logFile
23			self._log = None
24
25			def __enter__(self):
26			self.open()
27			return self
28
29			def __exit__(self, exc_type, exc_val, exc_tb):
30			self.close()
31
32			def open(self):
33			if self._log is not None:
34			self.close()
35			self._log = open(self._logFile, 'wb')
36			self.onOpen()
37
38			def close(self):
39			if self._log is not None:
40			self.beforeClose()
41			self._log.close()
42			self.afterClose()
43
44			def log(self, data: bytes):
45			self._log.write(self.encodeData(data))
46
47			def onOpen(self):
48			pass
49
50			def beforeClose(self):
51			pass
52
53			def afterClose(self):
54			pass
55
56			def encodeData(self, data):
57			return data
58
59			class PcapLogger(Logger):
60			def onOpen(self):
61			# write pcap global header
62			magic_number = b'\xD4\xC3\xB2\xA1'
63			version_major = 2
64			version_minor = 4
65			thiszone = b'\x00\x00\x00\x00'
66			sigfigs = b'\x00\x00\x00\x00'
67			snaplen = b'\xFF\x00\x00\x00'
68			network = b'\x01\x00\x00\x00'
69			pcap_global_header = Struct('<4shh4s4s4s4s')
70			self._log.write(
71			pcap_global_header.pack(magic_number, version_major, version_minor, thiszone, sigfigs,
72			snaplen, network))
73
74			def encodeData(self, data):
75			timestamp = time.time()
76			frac, whole = math.modf(timestamp)
77
78			ts_sec = int(whole).to_bytes(4, byteorder='little')
79			ts_usec = int(frac * 1000 * 1000).to_bytes(4, byteorder='little')
80			incl_len = len(data)
81			orig_len = incl_len
82
83			pcap_packet_header = Struct('<4s4sll').pack(ts_sec, ts_usec, incl_len, orig_len)
84			return pcap_packet_header + data
85
86			class Driver:
87			"""
88			The driver provides an interface to read and write raw data to and from an ANT+ capable hardware device
89			"""
90
91			def __init__(self, logger: Logger = None):
92			self._lock = Lock()
93			self._logger = logger
94			self._openTime = None
95
96			def __enter__(self):
97			self.open()
98			return self
99
100			def __exit__(self, exc_type, exc_val, exc_tb):
101			self.close()
102
103			def isOpen(self) -> bool:
104			with self._lock:
105			return self._isOpen()
106
107			def open(self) -> None:
108			with self._lock:
109			if not self._isOpen():
110			self._openTime = time.time()
111			if self._logger is not None:
112			self._logger.open()
113			self._open()
114
115			def close(self) -> None:
116			with self._lock:
117			if self._isOpen:
118			self._close()
119			if self._logger is not None:
120			self._logger.close()
121
122			def reOpen(self) -> None:
123			with self._lock:
124			if self._isOpen():
125			self._close()
126			self._open()
127
128			def read(self, timeout=None) -> Message:
129			# Splits the string into a list of tokens every n characters
130			def splitN(str1, n):
131			return [str1[start:start + n] for start in range(0, len(str1), n)]
132
133			if not self.isOpen():
134			raise DriverException("Device is closed")
135
136			with self._lock:
137			while True:
138			sync = self._read(1, timeout=timeout)[0]
139			if sync is not MESSAGE_TX_SYNC:
140			continue
141			length = self._read(1, timeout=timeout)[0]
142			type = self._read(1, timeout=timeout)[0]
143			data = self._read(length, timeout=timeout)
144			chk = self._read(1, timeout=timeout)[0]
145			msg = Message(type, data)
146
147			if self._logger:
148			logMsg = bytearray([sync, length, type])
149			logMsg.extend(data)
150			logMsg.append(chk)
151
152			self._logger.log(bytes(logMsg))
153
154			if msg.checksum() == chk:
155			return msg
156
157			def write(self, msg: Message) -> None:
158			if not self.isOpen():
159			raise DriverException("Device is closed")
160
161			with self._lock:
162			self._write(msg.encode())
163
164			@abstractmethod
165			def _isOpen(self) -> bool:
166			pass
167
168			@abstractmethod
169			def _open(self) -> None:
170			pass
171
172			@abstractmethod
173			def _close(self) -> None:
174			pass
175
176			@abstractmethod
177			def _read(self, count: int, timeout=None) -> bytes:
178			pass
179
180			@abstractmethod
181			def _write(self, data: bytes) -> None:
182			pass
183
184
185			class SerialDriver(Driver):
186			"""
187			An implementation of a serial ANT+ device driver
188			"""
189
190			def __init__(self, device: str, baudRate: int = 115200, logger: Logger = None):
191			super().__init__(logger=logger)
192			self._device = device
193			self._baudRate = baudRate
194			self._serial = None
195
196			def __str__(self):
197			if self.isOpen():
198			return self._device + " @ " + str(self._baudRate)
199			return None
200
201			def _isOpen(self) -> bool:
202			return self._serial is None
203
204			def _open(self) -> None:
205			try:
206			self._serial = Serial(self._device, self._baudRate)
207			except SerialException as e:
208			raise DriverException(str(e))
209
210			if not self._serial.isOpen():
211			raise DriverException("Could not open specified device")
212
213			def _close(self) -> None:
214			self._serial.close()
215			self._serial = None
216
217			def _read(self, count: int, timeout=None) -> bytes:
218			return self._serial.read(count, timeout=timeout)
219
220			def _write(self, data: bytes) -> None:
221			try:
222			self._serial.write(data)
223			self._serial.flush()
224			except SerialTimeoutException as e:
225			raise DriverException(str(e))
226
227
228			class USBDriver(Driver):
229			"""
230			An implementation of a USB ANT+ device driver
231			"""
232
233			def __init__(self, vid, pid, logger: Logger = None):
234			super().__init__(logger=logger)
235			self._idVendor = vid
236			self._idProduct = pid
237			self._dev = None
238			self._epOut = None
239			self._epIn = None
240			self._interfaceNumber = None
241			self._packetSize = 0x20
242			self._queue = None
243			self._loop = None
244			self._driver_open = False
245
246			def __str__(self):
247			if self.isOpen():
248			return str(self._dev)
249			return "Closed"
250
251			class USBLoop(Thread):
252			def __init__(self, ep, packetSize: int, queue: Queue):
253			super().__init__()
254			self._stopper = Event()
255			self._ep = ep
256			self._packetSize = packetSize
257			self._queue = queue
258
259			def stop(self) -> None:
260			self._stopper.set()
261
262			def run(self) -> None:
263			while not self._stopper.is_set():
264			try:
265			data = self._ep.read(self._packetSize, timeout=1000)
266			for d in data:
267			self._queue.put(d)
268			except usb.core.USBError as e:
269			if e.errno not in (60, 110) and e.backend_error_code != -116: # Timout errors
270			self._stopper.set()
271			# We Put in an invalid byte so threads will realize the device is stopped
272			self._queue.put(None)
273
274			def _isOpen(self) -> bool:
275			return self._driver_open
276
277			def _open(self) -> None:
278			print('USB OPEN START')
279			try:
280			# find the first USB device that matches the filter
281			self._dev = usb.core.find(idVendor=self._idVendor, idProduct=self._idProduct)
282
283			if self._dev is None:
284			raise DriverException("Could not open specified device")
285
286			# Detach kernel driver
287			try:
288			if self._dev.is_kernel_driver_active(0):
289			try:
290			self._dev.detach_kernel_driver(0)
291			except usb.USBError as e:
292			raise DriverException("Could not detach kernel driver")
293			except NotImplementedError:
294			pass # for non unix systems
295
296			# set the active configuration. With no arguments, the first
297			# configuration will be the active one
298			self._dev.set_configuration()
299
300			# get an endpoint instance
301			cfg = self._dev.get_active_configuration()
302			self._interfaceNumber = cfg[(0, 0)].bInterfaceNumber
303			interface = usb.util.find_descriptor(cfg, bInterfaceNumber=self._interfaceNumber,
304			bAlternateSetting=usb.control.get_interface(self._dev,
305			self._interfaceNumber))
306			usb.util.claim_interface(self._dev, self._interfaceNumber)
307
308			self._epOut = usb.util.find_descriptor(interface, custom_match=lambda e: usb.util.endpoint_direction(
309			e.bEndpointAddress) == usb.ENDPOINT_OUT)
310
311			self._epIn = usb.util.find_descriptor(interface, custom_match=lambda e: usb.util.endpoint_direction(
312			e.bEndpointAddress) == usb.ENDPOINT_IN)
313
314			if self._epOut is None or self._epIn is None:
315			raise DriverException("Could not initialize USB endpoint")
316
317			self._queue = Queue()
318			self._loop = self.USBLoop(self._epIn, self._packetSize, self._queue)
319			self._loop.start()
320			self._driver_open = True
321			print('USB OPEN SUCCESS')
322			except IOError as e:
323			self._close()
324			raise DriverException(str(e))
325
326			def _close(self) -> None:
327			print('USB CLOSE START')
328			if self._loop is not None:
329			if self._loop.is_alive():
330			self._loop.stop()
331			self._loop.join()
332			self._loop = None
333			try:
334			self._dev.reset()
335			usb.util.dispose_resources(self._dev)
336			except:
337			pass
338			self._dev = self._epOut = self._epIn = None
339			self._driver_open = False
340			print('USB CLOSE END')
341
342			def _read(self, count: int, timeout=None) -> bytes:
343			data = bytearray()
344			for i in range(0, count):
345			b = self._queue.get(timeout=timeout)
346			if b is None:
347			self._close()
348			raise DriverException("Device is closed!")
349			data.append(b)
350			return bytes(data)
351
352			def _write(self, data: bytes) -> None:
353			return self._epOut.write(data)
354
355
356			class DummyDriver(Driver):
357			def __init__(self, logger: Logger = None):
358			super().__init__(logger=logger)
359			self._isopen = False
360			self._data = Queue()
361			msg1 = Message(MESSAGE_CHANNEL_BROADCAST_DATA, b'\x00\x01\x02\x03\x04\x05\x06\x07').encode()
362			for b in msg1:
363			self._data.put(b)
364			msg2 = Message(MESSAGE_CHANNEL_BROADCAST_DATA, b'\x00\xF1\xF2\xF3\xF4\xF5\xF6\xF7').encode()
365			for b in msg2:
366			self._data.put(b)
367			msg3 = Message(MESSAGE_CHANNEL_BROADCAST_DATA, b'\x00\xF9\xFA\xFB\xFC\xFD\xFE\xFF').encode()
368			for b in msg3:
369			self._data.put(b)
370
371			def _isOpen(self) -> bool:
372			return self._isopen
373
374			def _close(self) -> None:
375			self._isopen = False
376
377			def _read(self, count: int, timeout=None) -> bytes:
378			data = bytearray()
379			for i in range(0, count):
380			data.append(self._data.get(timeout=timeout))
381			return bytes(data)
382
383			def _open(self) -> None:
384			self._isopen = True
385
386			def _write(self, data: bytes) -> None:
387			pass
388
389
390			class PcapDriver(Driver):
391			def __init__(self, pcap, logger: Logger = None):
392			super().__init__(logger=logger)
393			self._isopen = False
394			self._pcap = pcap
395			self._buffer = Queue()
396
397			self._loop = None
398
399			class PcapLoop(Thread):
400			def __init__(self, pcap, buffer: Queue):
401			super().__init__()
402			self._stopper = Event()
403			self._pcap = pcap
404			self._buffer = buffer
405
406			def stop(self) -> None:
407			self._stopper.set()
408
409			def run(self) -> None:
410			self._pcapfile = open(self._pcap, 'rb')
411			self._EOF = os.stat(self._pcap).st_size
412			# move file pointer to first packet header
413			global_header_length = 24
414			self._pcapfile.seek(global_header_length, 0)
415
416			first_ts = 0
417			start_time = time.time()
418			while not self._stopper.is_set():
419			if self._pcapfile.tell() is self._EOF:
420			continue
421
422			ts_sec, = unpack('i', self._pcapfile.read(4))
423			ts_usec = unpack('i', self._pcapfile.read(4))[0] / 1000000
424
425			if first_ts is 0:
426			first_ts = ts_sec + ts_usec
427
428			ts = ts_sec + ts_usec
429			send_time = ts - first_ts
430			elapsed_time = time.time() - start_time
431			if send_time > (elapsed_time):
432			sleep_time = send_time - elapsed_time
433			time.sleep(sleep_time)
434
435			packet_length = unpack('i', self._pcapfile.read(4))[0]
436			self._pcapfile.seek(4, 1)
437			for i in range(packet_length):
438			self._buffer.put(self._pcapfile.read(1))
439
440			self._pcapfile.close()
441
442			def _isOpen(self) -> bool:
443			return self._isopen
444
445			def _open(self) -> None:
446			self._isopen = True
447			self._loop = self.PcapLoop(self._pcap, self._buffer)
448			self._loop.start()
449
450			def _close(self) -> None:
451			self._isopen = False
452			if self._loop is not None:
453			if self._loop.is_alive():
454			self._loop.stop()
455			self._loop.join()
456			self._loop = None
457
458			def _read(self, count: int, timeout=None) -> bytes:
459			result = bytearray()
460
461			while len(result) < count:
462			result += self._buffer.get(block=True, timeout=timeout)
463
464			return bytes(result)
465
466			def _write(self, data: bytes) -> None:
467			pass
468

half2me / libant

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Pull Request — master (#3)

Logger.__enter__() A

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Logger.enter() A