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# API to receive NeXus files
__version__ = '0.0.1'
import zmq
import socket
import logging
import json
import errno
import os
import cPickle
import traceback
class nexusTransfer():
def __init__(self, signalHost = None, useLog = False, context = None):
if useLog:
self.log = logging.getLogger("nexusTransferAPI")
else:
class loggingFunction:
def out(self, x, exc_info = None):
if exc_info:
print x, traceback.format_exc()
else:
print x
def __init__(self):
self.debug = lambda x, exc_info=None: self.out(x, exc_info)
self.info = lambda x, exc_info=None: self.out(x, exc_info)
self.warning = lambda x, exc_info=None: self.out(x, exc_info)
self.error = lambda x, exc_info=None: self.out(x, exc_info)
self.critical = lambda x, exc_info=None: self.out(x, exc_info)
self.log = loggingFunction()
# ZMQ applications always start by creating a context,
# and then using that for creating sockets
# (source: ZeroMQ, Messaging for Many Applications by Pieter Hintjens)
if context:
self.context = context
self.externalContext = True
else:
self.context = zmq.Context()
self.externalContext = False
self.extHost = "0.0.0.0"
self.signalPort = "6000"
self.eventPort = "6001"
self.dataPort = "6002"
self.dataHost = None
self.dataPort = None
self.signalSocket = None
self.eventSocket = None
self.dataSocket = None
self.__createSockets()
def __createSocket(self):
self.signalSocket = self.context.socket(zmq.REP)
connectionStr = "tcp://" + str(self.extHost) + ":" + str(self.signalPort)
self.signalSocket.bind(connectionStr)
logging.info("signalSocket started (bind) for '" + connectionStr + "'")
self.eventSocket = self.context.socket(zmq.PULL)
connectionStr = "tcp://" + str(self.extHost) + ":" + str(self.eventPort)
self.eventSocket.bind(connectionStr)
logging.info("eventSocket started (bind) for '" + connectionStr + "'")
self.dataSocket = self.context.socket(zmq.PULL)
connectionStr = "tcp://" + str(self.extHost) + ":" + str(self.dataPort)
self.dataSocket.bind(connectionStr)
logging.info("dataSocket started (bind) for '" + connectionStr + "'")
def get(self):
message = self.signalSocket.recv()
logging.debug("signalSocket recv: " + message)
self.signalSocket.send(message)
logging.debug("signalSocket send: " + message)
for i in range(5):
logging.debug("eventSocket recv: " + str(cPickle.loads(self.eventSocket.recv())))
logging.debug("dataSocket recv: " + self.dataSocket.recv())
message = self.signalSocket.recv()
logging.debug("signalSocket recv: " + message)
self.signalSocket.send(message)
logging.debug("signalSocket send: " + message)
logging.debug("eventSocket recv: " + self.eventSocket.recv())
def __getMultipartMessage(self):
#save all chunks to file
multipartMessage = self.dataSocket.recv_multipart()
if len(multipartMessage) < 2:
self.log.error("Received mutipart-message is too short. Either config or file content is missing.")
self.log.debug("multipartMessage=" + str(mutipartMessage))
#extract multipart message
try:
metadata = cPickle.loads(multipartMessage[0])
except:
self.log.error("Could not extract metadata from the multipart-message.", exc_info=True)
metadata = None
#TODO validate multipartMessage (like correct dict-values for metadata)
try:
payload = multipartMessage[1:]
except:
self.log.warning("An empty file was received within the multipart-message", exc_info=True)
payload = None
return [metadata, payload]
##
#
# Send signal that the displayer is quitting, close ZMQ connections, destoying context
#
##
def stop(self):
try:
if self.signalSocket:
logging.info("closing eventSocket...")
self.signalSocket.close(linger=0)
self.signalSocket = None
if self.eventSocket:
logging.info("closing eventSocket...")
self.eventSocket.close(linger=0)
self.eventSocket = None
if self.dataSocket:
logging.info("closing dataSocket...")
self.dataSocket.close(linger=0)
self.dataSocket = None
except:
self.log.error("closing ZMQ Sockets...failed.", exc_info=True)
# if the context was created inside this class,
# it has to be destroyed also within the class
if not self.externalContext and self.context:
try:
self.log.info("Closing ZMQ context...")
self.context.destroy()
self.context = None
self.log.info("Closing ZMQ context...done.")
except:
self.log.error("Closing ZMQ context...failed.", exc_info=True)
def __exit__(self):
self.stop()
def __del__(self):
self.stop()