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import time |
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from abc import abstractmethod |
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from queue import Empty |
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from threading import Lock |
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from libAnt.constants import MESSAGE_TX_SYNC |
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from libAnt.loggers.logger import Logger |
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from libAnt.message import Message |
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class DriverException(Exception): |
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pass |
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class Driver: |
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""" |
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The driver provides an interface to read and write raw data to and from an ANT+ capable hardware device |
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""" |
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def __init__(self, logger: Logger = None): |
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self._lock = Lock() |
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self._logger = logger |
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self._openTime = None |
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def __enter__(self): |
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self.open() |
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return self |
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def __exit__(self, exc_type, exc_val, exc_tb): |
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self.close() |
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def isOpen(self) -> bool: |
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with self._lock: |
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return self._isOpen() |
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def open(self) -> None: |
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with self._lock: |
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if not self._isOpen(): |
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self._openTime = time.time() |
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if self._logger is not None: |
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self._logger.open() |
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self._open() |
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def close(self) -> None: |
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with self._lock: |
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if self._isOpen: |
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self._close() |
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if self._logger is not None: |
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self._logger.close() |
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def reOpen(self) -> None: |
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with self._lock: |
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if self._isOpen(): |
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self._close() |
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self._open() |
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def read(self, timeout=None) -> Message: |
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if not self.isOpen(): |
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raise DriverException("Device is closed") |
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with self._lock: |
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while True: |
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try: |
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sync = self._read(1, timeout=timeout)[0] |
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if sync is not MESSAGE_TX_SYNC: |
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continue |
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length = self._read(1, timeout=timeout)[0] |
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type = self._read(1, timeout=timeout)[0] |
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data = self._read(length, timeout=timeout) |
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chk = self._read(1, timeout=timeout)[0] |
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msg = Message(type, data) |
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if self._logger: |
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logMsg = bytearray([sync, length, type]) |
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logMsg.extend(data) |
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logMsg.append(chk) |
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self._logger.log(bytes(logMsg)) |
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if msg.checksum() == chk: |
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return msg |
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except IndexError: |
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raise Empty |
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def write(self, msg: Message) -> None: |
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if not self.isOpen(): |
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raise DriverException("Device is closed") |
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with self._lock: |
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self._write(msg.encode()) |
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def abort(self) -> None: |
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self._abort() |
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@abstractmethod |
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def _isOpen(self) -> bool: |
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pass |
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@abstractmethod |
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def _open(self) -> None: |
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pass |
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@abstractmethod |
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def _close(self) -> None: |
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pass |
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@abstractmethod |
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def _read(self, count: int, timeout=None) -> bytes: |
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pass |
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111
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@abstractmethod |
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def _write(self, data: bytes) -> None: |
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pass |
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115
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@abstractmethod |
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def _abort(self) -> None: |
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pass |
half2me /
libant
