from pycsdr.modules import Module as BaseModule from pycsdr.modules import Reader, Writer from pycsdr.types import Format from abc import ABCMeta, abstractmethod from threading import Thread from io import BytesIO from subprocess import Popen, PIPE from functools import partial import pickle class Module(BaseModule, metaclass=ABCMeta): def __init__(self): self.reader = None self.writer = None super().__init__() def setReader(self, reader: Reader) -> None: self.reader = reader def setWriter(self, writer: Writer) -> None: self.writer = writer @abstractmethod def getInputFormat(self) -> Format: pass @abstractmethod def getOutputFormat(self) -> Format: pass class AutoStartModule(Module, metaclass=ABCMeta): def _checkStart(self) -> None: if self.reader is not None and self.writer is not None: self.start() def setReader(self, reader: Reader) -> None: super().setReader(reader) self._checkStart() def setWriter(self, writer: Writer) -> None: super().setWriter(writer) self._checkStart() @abstractmethod def start(self): pass def pump(self, read, write): def copy(): while True: data = None try: data = read() except ValueError: pass if data is None or isinstance(data, bytes) and len(data) == 0: break write(data) return copy class ThreadModule(AutoStartModule, Thread, metaclass=ABCMeta): def __init__(self): self.doRun = True super().__init__() Thread.__init__(self) @abstractmethod def run(self): pass def stop(self): self.doRun = False self.reader.stop() def start(self): Thread.start(self) class PickleModule(ThreadModule): def getInputFormat(self) -> Format: return Format.CHAR def getOutputFormat(self) -> Format: return Format.CHAR def run(self): while self.doRun: data = self.reader.read() if data is None: self.doRun = False break io = BytesIO(data.tobytes()) try: while True: output = self.process(pickle.load(io)) if output is not None: self.writer.write(pickle.dumps(output)) except EOFError: pass @abstractmethod def process(self, input): pass class PopenModule(AutoStartModule, metaclass=ABCMeta): def __init__(self): self.process = None super().__init__() @abstractmethod def getCommand(self): pass def start(self): self.process = Popen(self.getCommand(), stdin=PIPE, stdout=PIPE) Thread(target=self.pump(self.reader.read, self.process.stdin.write)).start() Thread(target=self.pump(partial(self.process.stdout.read, 1024), self.writer.write)).start() def stop(self): if self.process is not None: self.process.terminate() self.process.wait() self.process = None self.reader.stop()