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151 lines
3.3 KiB
151 lines
3.3 KiB
# distutils: language = c++
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# cython: c_string_encoding=ascii, language_level=3
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import sys
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from libcpp.string cimport string
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from libcpp cimport bool
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from libc cimport errno
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from messaging cimport Context as cppContext
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from messaging cimport SubSocket as cppSubSocket
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from messaging cimport PubSocket as cppPubSocket
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from messaging cimport Poller as cppPoller
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from messaging cimport Message as cppMessage
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class MessagingError(Exception):
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pass
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class MultiplePublishersError(MessagingError):
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pass
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cdef class Context:
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cdef cppContext * context
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def __cinit__(self):
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self.context = cppContext.create()
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def term(self):
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del self.context
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self.context = NULL
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def __dealloc__(self):
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pass
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# Deleting the context will hang if sockets are still active
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# TODO: Figure out a way to make sure the context is closed last
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# del self.context
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cdef class Poller:
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cdef cppPoller * poller
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cdef list sub_sockets
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def __cinit__(self):
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self.sub_sockets = []
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self.poller = cppPoller.create()
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def __dealloc__(self):
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del self.poller
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def registerSocket(self, SubSocket socket):
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self.sub_sockets.append(socket)
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self.poller.registerSocket(socket.socket)
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def poll(self, timeout):
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sockets = []
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cdef int t = timeout
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with nogil:
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result = self.poller.poll(t)
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for s in result:
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socket = SubSocket()
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socket.setPtr(s)
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sockets.append(socket)
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return sockets
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cdef class SubSocket:
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cdef cppSubSocket * socket
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cdef bool is_owner
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def __cinit__(self):
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self.socket = cppSubSocket.create()
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self.is_owner = True
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if self.socket == NULL:
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raise MessagingError
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def __dealloc__(self):
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if self.is_owner:
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del self.socket
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cdef setPtr(self, cppSubSocket * ptr):
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if self.is_owner:
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del self.socket
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self.is_owner = False
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self.socket = ptr
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def connect(self, Context context, string endpoint, string address=b"127.0.0.1", bool conflate=False):
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r = self.socket.connect(context.context, endpoint, address, conflate)
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if r != 0:
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if errno.errno == errno.EADDRINUSE:
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raise MultiplePublishersError
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else:
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raise MessagingError
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def setTimeout(self, int timeout):
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self.socket.setTimeout(timeout)
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def receive(self, bool non_blocking=False):
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msg = self.socket.receive(non_blocking)
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if msg == NULL:
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# If a blocking read returns no message check errno if SIGINT was caught in the C++ code
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if errno.errno == errno.EINTR:
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print("SIGINT received, exiting")
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sys.exit(1)
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return None
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else:
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sz = msg.getSize()
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m = msg.getData()[:sz]
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del msg
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return m
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cdef class PubSocket:
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cdef cppPubSocket * socket
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def __cinit__(self):
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self.socket = cppPubSocket.create()
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if self.socket == NULL:
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raise MessagingError
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def __dealloc__(self):
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del self.socket
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def connect(self, Context context, string endpoint):
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r = self.socket.connect(context.context, endpoint)
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if r != 0:
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if errno.errno == errno.EADDRINUSE:
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raise MultiplePublishersError
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else:
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raise MessagingError
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def send(self, string data):
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length = len(data)
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r = self.socket.send(<char*>data.c_str(), length)
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if r != length:
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if errno.errno == errno.EADDRINUSE:
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raise MultiplePublishersError
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else:
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raise MessagingError
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