class CcnxSocket(object):
''' A socket like handler for ccnx operations.
Runs a simple event loop and handles set interest filter, send interest,
and publish data.
Current only one ccnx handle is used, we can use multiple handles if needed,
but there is no such need as of now.
'''
__logger = Logger.get_logger('CcnxSocket')
def __init__(self, *args, **kwargs):
'''
Creates a socket. As of now, we try to get the ccnx key from the default location
'''
super(CcnxSocket, self).__init__()
self.ccnx_key = CCN.getDefaultKey()
self.ccnx_key_locator = pyccn.KeyLocator(self.ccnx_key)
self.ccnx_handle = CCN()
self.event_loop = CcnxLoop(self.ccnx_handle)
def get_signed_info(self, freshness):
'''
Get signed info to be included in the Content Object
Args:
freshness (int): the freshness of the Content Object in seconds
Returns:
a PyCCN.SignedInfo object
'''
si = pyccn.SignedInfo()
si.publisherPublicKeyDigest = self.ccnx_key.publicKeyID
si.type = pyccn.CONTENT_DATA
si.freshnessSeconds = freshness
si.keyLocator = self.ccnx_key_locator
return si
def get_pyccn_name(self, name):
'''Get a valid name for PyCCN. This is useful when the name string is encoded as unicode, as is the usual case in Python. However, PyCCN has problem handling unicode names, raising TypeError as a result.
Args:
name (str): the name string
Returns:
An ascii encoded name string
'''
if isinstance(name, unicode):
return Name(name.encode('ascii', 'ignore'))
else:
return Name(name)
def publish_content(self, name, content, freshness = 5):
'''Publish the data as a Content Object
Args:
name (str): the name string
content (bytes): the data bytes
Kwargs:
freshness (int): the freshness in seconds for the Content Object
'''
co = ContentObject()
co.name = self.get_pyccn_name(name)
co.content = content
si = self.get_signed_info(freshness)
co.signedInfo = si
co.sign(self.ccnx_key)
self.ccnx_handle.put(co)
def send_interest(self, name, closure, template = None):
'''Send Interest
Args:
name (str): the name string
closure (PyCCN.Closure): the closure that includes the callbacks to be used by PyCCN for this Interest
Kwargs:
template (PyCCN.Interest): the template for the additional field to be carried in the Interest, such as ChildSelector, Lifetime, AnswerOrigin, etc..
'''
n = self.get_pyccn_name(name)
self.ccnx_handle.expressInterest(n, closure, template)
def register_prefix(self, prefix, closure):
'''Register the prefix under which the user wishes to receive Interests
Args:
prefix (str): the prefix name string
closure (PyCCN.Closure): the closure that includes the callbacks to be used by PyCCN when an Interest with such prefix comes
'''
p = self.get_pyccn_name(prefix)
self.ccnx_handle.setInterestFilter(p, closure)
def start(self):
'''Start the CcnxLoop
'''
start_new_thread(self.event_loop.run, ())
def stop(self):
'''Stop the CcnxLoop
'''
self.event_loop.stop()
upcall_called = True
#receiver_handle.setRunTimeout(0)
event_loop.stop()
return pyccn.RESULT_OK
senderclosure = SenderClosure()
receiverclosure = ReceiverClosure()
sender_handle = CCN()
receiver_handle = CCN()
#Looks like the CCNx API doesn't deliver messages
#that we sent to ourselves, so we just push it
sender_handle.setInterestFilter(n, senderclosure)
#senderclosure.upcall(1, None)
i = Interest()
receiver_handle.expressInterest(n, receiverclosure, i)
upcall_called = False
print("Running loops")
#So sender closure is called
#sender_handle.run(500)
#So receiver closure is called
#receiver_handle.run(500)
class CcnxSocket(object):
''' A socket like handler for ccnx operations.
Runs a simple event loop and handles set interest filter, send interest,
and publish data.
Current only one ccnx handle is used, we can use multiple handles if needed,
but there is no such need as of now.
'''
__logger = Logger.get_logger('CcnxSocket')
def __init__(self, *args, **kwargs):
'''
Creates a socket. As of now, we try to get the ccnx key from the default location
'''
super(CcnxSocket, self).__init__()
self.ccnx_key = CCN.getDefaultKey()
self.ccnx_key_locator = pyccn.KeyLocator(self.ccnx_key)
self.ccnx_handle = CCN()
self.event_loop = CcnxLoop(self.ccnx_handle)
def get_signed_info(self, freshness):
'''
Get signed info to be included in the Content Object
Args:
freshness (int): the freshness of the Content Object in seconds
Returns:
a PyCCN.SignedInfo object
'''
si = pyccn.SignedInfo()
si.publisherPublicKeyDigest = self.ccnx_key.publicKeyID
si.type = pyccn.CONTENT_DATA
si.freshnessSeconds = freshness
si.keyLocator = self.ccnx_key_locator
return si
def get_pyccn_name(self, name):
'''Get a valid name for PyCCN. This is useful when the name string is encoded as unicode, as is the usual case in Python. However, PyCCN has problem handling unicode names, raising TypeError as a result.
Args:
name (str): the name string
Returns:
An ascii encoded name string
'''
if isinstance(name, unicode):
return Name(name.encode('ascii', 'ignore'))
else:
return Name(name)
def publish_content(self, name, content, freshness=5):
'''Publish the data as a Content Object
Args:
name (str): the name string
content (bytes): the data bytes
Kwargs:
freshness (int): the freshness in seconds for the Content Object
'''
co = ContentObject()
co.name = self.get_pyccn_name(name)
co.content = content
si = self.get_signed_info(freshness)
co.signedInfo = si
co.sign(self.ccnx_key)
self.ccnx_handle.put(co)
def send_interest(self, name, closure, template=None):
'''Send Interest
Args:
name (str): the name string
closure (PyCCN.Closure): the closure that includes the callbacks to be used by PyCCN for this Interest
Kwargs:
template (PyCCN.Interest): the template for the additional field to be carried in the Interest, such as ChildSelector, Lifetime, AnswerOrigin, etc..
'''
n = self.get_pyccn_name(name)
self.ccnx_handle.expressInterest(n, closure, template)
def register_prefix(self, prefix, closure):
'''Register the prefix under which the user wishes to receive Interests
Args:
prefix (str): the prefix name string
closure (PyCCN.Closure): the closure that includes the callbacks to be used by PyCCN when an Interest with such prefix comes
'''
p = self.get_pyccn_name(prefix)
self.ccnx_handle.setInterestFilter(p, closure)
def start(self):
'''Start the CcnxLoop
'''
start_new_thread(self.event_loop.run, ())
def stop(self):
'''Stop the CcnxLoop
'''
self.event_loop.stop()
class TyzxServer(Closure):
def __init__(self, prefixstr ):
self.handle = CCN()
#XXX: temporary, until we allow fetching key from key storage
self.key = self.handle.getDefaultKey()
self.keylocator = KeyLocator(self.key)
self.prefix = Name(prefixstr)
# member_name = Name.Name(self.members_uri)
# member_name.appendKeyID(fix_digest(self.key.publicKeyID))
# self.member_message = self.publish(member_name, nick)
def listen(self):
#listen to requests in namespace
self.handle.setInterestFilter(self.prefix, self)
self.handle.run(-1)
def publish(self, name, content):
# Name
#print name
# SignedInfo
si = pyccn.SignedInfo()
#si.type = pyccn.CCN_CONTENT_DATA
si.type = 0x0C04C0 # content type
si.finalBlockID = b'\x00'
si.publisherPublicKeyDigest = self.key.publicKeyID
si.keyLocator = self.keylocator
si.freshnessSeconds = FRESHNESS_SECONDS
# ContentObject
co = ContentObject()
co.content = content
co.name = name
co.signedInfo = si
co.sign(self.key)
return co
def upcall(self, kind, upcallInfo):
global lasttime
if lasttime is None: # can't answer yet
return pyccn.RESULT_OK
if len(tyzxObjs.objs)<1:
return pyccn.RESULT_OK
interest = upcallInfo.Interest
#print "Interest", interest.name, time.time()
# CALL content matches interest to check exclusion on versions
#
#print interest.exclude
name = interest.name
#print name
if name==self.prefix: # root
#print "Request for root: %s" % str(name)
if interest.exclude is None:
freshids = tyzxObjs.objs.keys()[0:1]
else:
if len(interest.exclude.components) > 0:
ids = set(tyzxObjs.objs.keys())# new stuff we have
suffixes = set([int(str(s)[1:]) for s in interest.exclude.components])
freshids = list(ids.difference(suffixes)) # do we need this conversion?
#print "ids", ids
#print "suffixes", suffixes
#print "freshids", freshids
else:
freshids = tyzxObjs.objs.keys()[0:1]
if len(freshids)>0:
child = freshids[0]
else:
return pyccn.RESULT_OK # no new content
else: # should check what we're receiving! take next component
child = int(name.components[-1:][0]) # why not be able to do this on name?
#print "Request for child: %s" % child, time.time()
#print "child - ", child
if tyzxObjs.objs.has_key(child):
O = tyzxObjs.objs[child]
else:
# Don't want to respond with a nonexistent. NDN way is to not answer interest.
# If we've just started, we may not even know what the content store knows.
# But, we do want to answer "exits" that we know about.
#print "child", child, "is not present"
if tyzxObjs.objExits.has_key(child):
#print "child", child, "is exited"
O = tyzxObjs.objExits[child]
else:
return pyccn.RESULT_OK
#O = CompositeObject(BaseObject())
#O.time = lasttime.time
#O.id = int(child)
#O.status = "nonexistent"
msgname = Name(self.prefix)
msgname += str(child)
msgname.components.append(versionFromTime (O.time)) # should have msgname.append
#msgname.ccn_data_dirty=True - now handled within PyCCN
# need binary add component
self.message = self.publish(msgname, O.toJSON())
#print "Publishing", msgname, O.toJSON()
#print "Present:", tyzxObjs.objs.keys(), time.time()
self.handle.put(self.message)
return pyccn.RESULT_INTEREST_CONSUMED
return pyccn.RESULT_OK
class TyzxServer(Closure):
def __init__(self, prefixstr):
self.handle = CCN()
#XXX: temporary, until we allow fetching key from key storage
self.key = self.handle.getDefaultKey()
self.keylocator = KeyLocator(self.key)
self.prefix = Name(prefixstr)
# member_name = Name.Name(self.members_uri)
# member_name.appendKeyID(fix_digest(self.key.publicKeyID))
# self.member_message = self.publish(member_name, nick)
def listen(self):
#listen to requests in namespace
self.handle.setInterestFilter(self.prefix, self)
self.handle.run(-1)
def publish(self, name, content):
# Name
#print name
# SignedInfo
si = pyccn.SignedInfo()
#si.type = pyccn.CCN_CONTENT_DATA
si.type = 0x0C04C0 # content type
si.finalBlockID = b'\x00'
si.publisherPublicKeyDigest = self.key.publicKeyID
si.keyLocator = self.keylocator
si.freshnessSeconds = FRESHNESS_SECONDS
# ContentObject
co = ContentObject()
co.content = content
co.name = name
co.signedInfo = si
co.sign(self.key)
return co
def upcall(self, kind, upcallInfo):
global lasttime
if lasttime is None: # can't answer yet
return pyccn.RESULT_OK
if len(tyzxObjs.objs) < 1:
return pyccn.RESULT_OK
interest = upcallInfo.Interest
#print "Interest", interest.name, time.time()
# CALL content matches interest to check exclusion on versions
#
#print interest.exclude
name = interest.name
#print name
if name == self.prefix: # root
#print "Request for root: %s" % str(name)
if interest.exclude is None:
freshids = tyzxObjs.objs.keys()[0:1]
else:
if len(interest.exclude.components) > 0:
ids = set(tyzxObjs.objs.keys()) # new stuff we have
suffixes = set(
[int(str(s)[1:]) for s in interest.exclude.components])
freshids = list(ids.difference(
suffixes)) # do we need this conversion?
#print "ids", ids
#print "suffixes", suffixes
#print "freshids", freshids
else:
freshids = tyzxObjs.objs.keys()[0:1]
if len(freshids) > 0:
child = freshids[0]
else:
return pyccn.RESULT_OK # no new content
else: # should check what we're receiving! take next component
child = int(
name.components[-1:][0]) # why not be able to do this on name?
#print "Request for child: %s" % child, time.time()
#print "child - ", child
if tyzxObjs.objs.has_key(child):
O = tyzxObjs.objs[child]
else:
# Don't want to respond with a nonexistent. NDN way is to not answer interest.
# If we've just started, we may not even know what the content store knows.
# But, we do want to answer "exits" that we know about.
#print "child", child, "is not present"
if tyzxObjs.objExits.has_key(child):
#print "child", child, "is exited"
O = tyzxObjs.objExits[child]
else:
return pyccn.RESULT_OK
#O = CompositeObject(BaseObject())
#O.time = lasttime.time
#O.id = int(child)
#O.status = "nonexistent"
msgname = Name(self.prefix)
msgname += str(child)
msgname.components.append(versionFromTime(
O.time)) # should have msgname.append
#msgname.ccn_data_dirty=True - now handled within PyCCN
# need binary add component
self.message = self.publish(msgname, O.toJSON())
#print "Publishing", msgname, O.toJSON()
#print "Present:", tyzxObjs.objs.keys(), time.time()
self.handle.put(self.message)
return pyccn.RESULT_INTEREST_CONSUMED
return pyccn.RESULT_OK
