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