Created
November 30, 2010 07:21
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fifo listener
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from twisted.internet import main, reactor | |
from twisted.internet.abstract import FileDescriptor | |
from twisted.internet.error import ConnectionDone | |
from twisted.internet.fdesc import setNonBlocking | |
from twisted.internet.interfaces import IReadDescriptor | |
from twisted.internet.protocol import Protocol | |
from twisted.python import log | |
from twisted.python.failure import Failure | |
from twisted.python.filepath import FilePath | |
from zope.interface import implements | |
import errno | |
import os | |
import sys | |
class FIFO(FileDescriptor): | |
chunk_size = 2 | |
implements(IReadDescriptor) | |
def __init__(self, path, _reactor=None): | |
self._fd = None | |
self._path = path | |
FileDescriptor.__init__(self, _reactor) | |
def startReading(self): | |
if self._fd is not None and not self._fd.closed: | |
FileDescriptor.startReading(self) | |
return | |
self._fd = self._path.open('r') | |
setNonBlocking(self._fd) | |
FileDescriptor.startReading(self) | |
def fileno(self): | |
return self._fd.fileno() | |
def doRead(self): | |
while True: | |
try: | |
output = os.read(self.fileno(), self.chunk_size) | |
except (OSError, IOError), err: | |
if err.args[0] in (errno.EAGAIN, errno.EINTR): | |
return | |
else: | |
return main.CONNECTION_LOST | |
if not output: | |
return main.CONNECTION_DONE | |
self.protocol.dataReceived(output) | |
def connectionLost(self, reason): | |
FileDescriptor.connectionLost(self, reason) | |
self.protocol.connectionLost(reason) | |
def logPrefix(self): | |
return "%s: %s" % (self.__class__.__name__, self._path.path) | |
class FIFOListener(Protocol): | |
def __init__(self, path, _reactor=None): | |
if _reactor is not None: | |
self._reactor = _reactor | |
else: | |
self._reactor = reactor | |
self.path = path | |
def startListening(self): | |
self.fdesc = FIFO(self.path, self._reactor) | |
self.fdesc.protocol = self | |
self.makeConnection(self.fdesc) | |
def dataReceived(self, data): | |
log.msg("Got data from fifo: %s" % data) | |
def connectionLost(self, reason): | |
if reason.check(ConnectionDone) is not None: | |
self.startListening() | |
else: | |
log.err(reason) | |
def connectionMade(self): | |
try: | |
self.transport.startReading() | |
except (OSError, IOError), err: | |
self.connectionLost(Failure(err)) | |
def _main(): | |
log.startLogging(sys.stdout) | |
proto = FIFOListener(FilePath('foo')) | |
proto.startListening() | |
if __name__ == '__main__': | |
reactor.callWhenRunning(_main) | |
reactor.run() | |
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