def connect(self, connectionInfo, elementListener, onConnected):
"""
Connect according to the info in connectionInfo, and use
elementListener.
:param UdpTransport.ConnectionInfo connectionInfo: A
UdpTransport.ConnectionInfo.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedElement
:param onConnected: This calls onConnected() when the connection is
established.
:type onConnected: function object
"""
self.close()
# Save the _address to use in sendto.
self._address = (connectionInfo.getHost(), connectionInfo.getPort())
self._socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
if connectionInfo.getLocalPort() != None:
self._socket.bind(("0.0.0.0", connectionInfo.getLocalPort()))
self._socketPoller = SocketPoller(self._socket)
self._elementReader = ElementReader(elementListener)
if onConnected != None:
onConnected()
def connect(self, connectionInfo, elementListener, onConnected):
"""
Connect according to the info in connectionInfo, and use
elementListener.
:param UdpTransport.ConnectionInfo connectionInfo: A
UdpTransport.ConnectionInfo.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedElement
:param onConnected: This calls onConnected() when the connection is
established.
:type onConnected: function object
"""
self.close()
# Save the _address to use in sendto.
self._address = (connectionInfo.getHost(), connectionInfo.getPort())
self._socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
if connectionInfo.getLocalPort() != None:
self._socket.bind(("0.0.0.0", connectionInfo.getLocalPort()))
self._socketPoller = SocketPoller(self._socket)
self._elementReader = ElementReader(elementListener)
if onConnected != None:
onConnected()
def connect(self, connectionInfo, elementListener):
"""
Connect according to the info in connectionInfo, and use
elementListener.
:param UdpTransport.ConnectionInfo connectionInfo: A
UdpTransport.ConnectionInfo.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedData
"""
self.close()
# Save the _address to use in sendto.
self._address = (connectionInfo.getHost(), connectionInfo.getPort())
self._socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
if hasattr(select, "poll"):
# Set up _poll. (Ubuntu, etc.)
self._poll = select.poll()
self._poll.register(self._socket.fileno(), select.POLLIN)
elif hasattr(select, "kqueue"):
## Set up _kqueue. (BSD and OS X)
self._kqueue = select.kqueue()
self._kevents = [select.kevent(
self._socket.fileno(), filter = select.KQ_FILTER_READ,
flags = select.KQ_EV_ADD | select.KQ_EV_ENABLE |
select.KQ_EV_CLEAR)]
elif not hasattr(select, "select"):
# Most Python implementations have this fallback, so we
# don't expect this error.
raise RuntimeError("Cannot find a polling utility for sockets")
self._elementReader = ElementReader(elementListener)
def connect(self, connectionInfo, elementListener):
"""
Connect according to the info in connectionInfo, and use
elementListener.
:param UnixTransport.ConnectionInfo connectionInfo: A
UnixTransport.ConnectionInfo.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedData
"""
self.close()
self._socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self._socket.connect(connectionInfo.getFilePath())
self._socketPoller = SocketPoller(self._socket)
self._elementReader = ElementReader(elementListener)
def connect(self, connectionInfo, elementListener):
"""
Connect according to the info in connectionInfo, and use
elementListener.
:param UdpTransport.ConnectionInfo connectionInfo: A
UdpTransport.ConnectionInfo.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedData
"""
self.close()
# Save the _address to use in sendto.
self._address = (connectionInfo.getHost(), connectionInfo.getPort())
self._socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self._socketPoller = SocketPoller(self._socket)
self._elementReader = ElementReader(elementListener)
def connect(self, connectionInfo, elementListener, onConnected):
"""
Connect according to the info in connectionInfo, and use
elementListener.
:param UnixTransport.ConnectionInfo connectionInfo: A
UnixTransport.ConnectionInfo.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedElement
:param onConnected: This calls onConnected() when the connection is
established.
:type onConnected: function object
"""
self.close()
self._socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self._socket.connect(connectionInfo.getFilePath())
self._socketPoller = SocketPoller(self._socket)
self._elementReader = ElementReader(elementListener)
onConnected()
def start(self):
# init btle ElementReader
el = BtleNode(self._producer.onBtleData, None, None)
em = ElementReader(el)
class MyDelegate(DefaultDelegate):
def __init__(self):
DefaultDelegate.__init__(self)
def handleNotification(self, cHandle, data):
# TODO: this should handle incorrect format caused by packet losses
try:
em.onReceivedData(data[2:])
except ValueError as e:
print "Decoding value error: " + str(e)
# connect ble
while not self._p:
try:
self._p = Peripheral(self._addr, "random")
except BTLEException as e:
print "Failed to connect: " + str(e) + "; trying again"
self._p = None
# tell rfduino we are ready for notifications
self._p.setDelegate(MyDelegate())
self._p.writeCharacteristic(self._p.getCharacteristics(uuid = self._receive_uuid)[0].valHandle + 1, "\x01\x00")
self._loop.create_task(self.btleNotificationListen())
if self._security:
# send our public key if configured to do so
print "security on, sending our public key"
interest = self._producer.makePublicKeyInterest()
# write characteristics
data = interest.wireEncode().toRawStr()
num_fragments = int(math.ceil(float(len(data)) / 18))
print "length of data: " + str(len(data)) + "; number of fragments: " + str(num_fragments)
current = 0
for i in range(0, num_fragments - 1):
fragment = struct.pack(">B", i) + struct.pack(">B", num_fragments) + data[current:current + 18]
current += 18
self._p.writeCharacteristic(self._p.getCharacteristics(uuid = self._send_uuid)[0].valHandle, fragment)
print " ".join(x.encode('hex') for x in fragment)
fragment = struct.pack(">B", num_fragments - 1) + struct.pack(">B", num_fragments) + data[current:]
self._p.writeCharacteristic(self._p.getCharacteristics(uuid = self._send_uuid)[0].valHandle, fragment)
print " ".join(x.encode('hex') for x in fragment)
def _connectHelper(self, elementListener, connectCoroutine):
"""
This is a protected helper method to Connect using the connectCoroutine,
and use elementListener.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedElement
:param coroutine connectionInfo: The connect coroutine which uses
_ReceiveProtocol, e.g. self._loop.create_connection(
lambda: AsyncSocketTransport._ReceiveProtocol(self, onConnected), host, port).
:type onConnected: function object
"""
self.close()
asyncio.async(connectCoroutine, loop = self._loop)
self._elementReader = ElementReader(elementListener)
def connect(self, connectionInfo, elementListener):
"""
Connect according to the info in connectionInfo, and use
elementListener.
:param UdpTransport.ConnectionInfo connectionInfo: A
UdpTransport.ConnectionInfo.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedData
"""
self.close()
# Save the _address to use in sendto.
self._address = (connectionInfo.getHost(), connectionInfo.getPort())
self._socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self._socketPoller = SocketPoller(self._socket)
self._elementReader = ElementReader(elementListener)
def connect(self, connectionInfo, elementListener, onConnected):
"""
Connect according to the info in connectionInfo, and use
elementListener.
:param UnixTransport.ConnectionInfo connectionInfo: A
UnixTransport.ConnectionInfo.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedElement
:param onConnected: This calls onConnected() when the connection is
established.
:type onConnected: function object
"""
self.close()
self._socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self._socket.connect(connectionInfo.getFilePath())
self._socketPoller = SocketPoller(self._socket)
self._elementReader = ElementReader(elementListener)
onConnected()
class UdpTransport(Transport):
"""
Create a new UdpTransport in the unconnected state.
"""
def __init__(self):
self._socket = None
self._socketPoller = None
self._buffer = bytearray(Common.MAX_NDN_PACKET_SIZE)
# Create a Blob and take its buf() since this creates a memoryview
# which is more efficient for slicing.
self._bufferView = Blob(self._buffer, False).buf()
self._elementReader = None
class ConnectionInfo(Transport.ConnectionInfo):
"""
Create a new UdpTransport.ConnectionInfo which extends
Transport.ConnectionInfo to hold the host and port info for the UDP
connection.
:param str host: The host for the connection.
:param int port: (optional) The port number for the connection. If
omitted, use 6363.
"""
def __init__(self, host, port = 6363):
self._host = host
self._port = port
def getHost(self):
"""
Get the host given to the constructor.
:return: The host.
:rtype: str
"""
return self._host
def getPort(self):
"""
Get the port given to the constructor.
:return: The port.
:rtype: int
"""
return self._port
def isLocal(self, connectionInfo):
"""
Determine whether this transport connecting according to connectionInfo
is to a node on the current machine. UDP transports are always non-local.
:param UdpTransport.ConnectionInfo connectionInfo: This is ignored.
:return: False because UDP transports are always non-local.
:rtype: bool
"""
return False
def isAsync(self):
"""
Override to return false since connect does not need to use the
onConnected callback.
:return: False
:rtype bool:
"""
return False
def connect(self, connectionInfo, elementListener, onConnected):
"""
Connect according to the info in connectionInfo, and use
elementListener.
:param UdpTransport.ConnectionInfo connectionInfo: A
UdpTransport.ConnectionInfo.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedElement
:param onConnected: This calls onConnected() when the connection is
established.
:type onConnected: function object
"""
self.close()
# Save the _address to use in sendto.
self._address = (connectionInfo.getHost(), connectionInfo.getPort())
self._socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self._socketPoller = SocketPoller(self._socket)
self._elementReader = ElementReader(elementListener)
if onConnected != None:
onConnected()
# This will be set True if send gets a TypeError.
_sendNeedsStr = False
def send(self, data):
"""
Send data to the host.
:param data: The buffer of data to send.
:type data: An array type accepted by socket.send
"""
if UdpTransport._sendNeedsStr:
# This version of sendall can't use a memoryview, etc., so convert.
self._socket.sendto(str(bytearray(data)), self._address)
else:
try:
self._socket.sendto(data, self._address)
except TypeError:
# Assume we need to convert to a str.
UdpTransport._sendNeedsStr = True
self.send(data)
def processEvents(self):
"""
Process any data to receive. For each element received, call
elementListener.onReceivedElement.
This is non-blocking and will silently time out after a brief period if
there is no data to receive.
You should repeatedly call this from an event loop.
You should normally not call this directly since it is called by
Face.processEvents.
If you call this from an main event loop, you may want to catch and
log/disregard all exceptions.
"""
if not self.getIsConnected():
return
# Loop until there is no more data in the receive buffer.
while True:
if not self._socketPoller.isReady():
# There is no data waiting.
return
nBytesRead, _ = self._socket.recvfrom_into(self._buffer)
if nBytesRead <= 0:
# Since we checked for data ready, we don't expect this.
return
# _bufferView is a memoryview, so we can slice efficienty.
self._elementReader.onReceivedData(self._bufferView[0:nBytesRead])
def getIsConnected(self):
"""
For UDP, there really is no connection, but just return True if
connect has been called.
:return: True if connected.
:rtype: bool
"""
if self._socket == None:
return False
# Assume we are still connected. TODO: Do a test receive?
return True
def close(self):
"""
Close the connection. If not connected, this does nothing.
"""
if self._socketPoller != None:
self._socketPoller.close()
self._socketPoller = None
if self._socket != None:
self._socket.close()
self._socket = None
class UnixTransport(Transport):
"""
Create a new UnixTransport in the unconnected state.
"""
def __init__(self):
self._socket = None
self._socketPoller = None
self._buffer = bytearray(8000)
# Create a Blob and take its buf() since this creates a memoryview
# which is more efficient for slicing.
self._bufferView = Blob(self._buffer, False).buf()
self._elementReader = None
class ConnectionInfo(Transport.ConnectionInfo):
"""
Create a new UnixTransport.ConnectionInfo which extends
Transport.ConnectionInfo to hold the socket file path for the Unix
socket connection.
:param str filePath: The file path of the Unix socket file.
"""
def __init__(self, filePath):
self._filePath = filePath
def getFilePath(self):
"""
Get the filePath given to the constructor.
:return: The file path.
:rtype: str
"""
return self._filePath
def connect(self, connectionInfo, elementListener):
"""
Connect according to the info in connectionInfo, and use
elementListener.
:param UnixTransport.ConnectionInfo connectionInfo: A
UnixTransport.ConnectionInfo.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedData
"""
self.close()
self._socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self._socket.connect(connectionInfo.getFilePath())
self._socketPoller = SocketPoller(self._socket)
self._elementReader = ElementReader(elementListener)
# This will be set True if send gets a TypeError.
_sendNeedsStr = False
def send(self, data):
"""
Set data to the host.
:param data: The buffer of data to send.
:type data: An array type accepted by socket.send
"""
if UnixTransport._sendNeedsStr:
# This version of sendall can't use a memoryview, etc., so convert.
self._socket.sendall(str(bytearray(data)))
else:
try:
self._socket.sendall(data)
except TypeError:
# Assume we need to convert to a str.
UnixTransport._sendNeedsStr = True
self.send(data)
def processEvents(self):
"""
Process any data to receive. For each element received, call
elementListener.onReceivedElement.
This is non-blocking and will silently time out after a brief period if
there is no data to receive.
You should repeatedly call this from an event loop.
You should normally not call this directly since it is called by
Face.processEvents.
If you call this from an main event loop, you may want to catch and
log/disregard all exceptions.
"""
if not self.getIsConnected():
return
# Loop until there is no more data in the receive buffer.
while True:
if not self._socketPoller.isReady():
# There is no data waiting.
return
nBytesRead = self._socket.recv_into(self._buffer)
if nBytesRead <= 0:
# Since we checked for data ready, we don't expect this.
return
# _bufferView is a memoryview, so we can slice efficienty.
self._elementReader.onReceivedData(self._bufferView[0:nBytesRead])
def getIsConnected(self):
"""
Check if the transport is connected.
:return: True if connected.
:rtype: bool
"""
if self._socket == None:
return False
# Assume we are still connected. TODO: Do a test receive?
return True
def close(self):
"""
Close the connection. If not connected, this does nothing.
"""
if self._socketPoller != None:
self._socketPoller.close()
self._socketPoller = None
if self._socket != None:
self._socket.close()
self._socket = None
class UdpTransport(Transport):
"""
Create a new UdpTransport in the unconnected state.
"""
def __init__(self):
self._socket = None
self._socketPoller = None
self._buffer = bytearray(8000)
# Create a Blob and take its buf() since this creates a memoryview
# which is more efficient for slicing.
self._bufferView = Blob(self._buffer, False).buf()
self._elementReader = None
class ConnectionInfo(Transport.ConnectionInfo):
"""
Create a new UdpTransport.ConnectionInfo which extends
Transport.ConnectionInfo to hold the host and port info for the UDP
connection.
:param str host: The host for the connection.
:param int port: (optional) The port number for the connection. If
omitted, use 6363.
"""
def __init__(self, host, port = 6363):
self._host = host
self._port = port
def getHost(self):
"""
Get the host given to the constructor.
:return: The host.
:rtype: str
"""
return self._host
def getPort(self):
"""
Get the port given to the constructor.
:return: The port.
:rtype: int
"""
return self._port
def connect(self, connectionInfo, elementListener):
"""
Connect according to the info in connectionInfo, and use
elementListener.
:param UdpTransport.ConnectionInfo connectionInfo: A
UdpTransport.ConnectionInfo.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedElement
"""
self.close()
# Save the _address to use in sendto.
self._address = (connectionInfo.getHost(), connectionInfo.getPort())
self._socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self._socketPoller = SocketPoller(self._socket)
self._elementReader = ElementReader(elementListener)
# This will be set True if send gets a TypeError.
_sendNeedsStr = False
def send(self, data):
"""
Set data to the host.
:param data: The buffer of data to send.
:type data: An array type accepted by socket.send
"""
if UdpTransport._sendNeedsStr:
# This version of sendall can't use a memoryview, etc., so convert.
self._socket.sendto(str(bytearray(data)), self._address)
else:
try:
self._socket.sendto(data, self._address)
except TypeError:
# Assume we need to convert to a str.
UdpTransport._sendNeedsStr = True
self.send(data)
def processEvents(self):
"""
Process any data to receive. For each element received, call
elementListener.onReceivedElement.
This is non-blocking and will silently time out after a brief period if
there is no data to receive.
You should repeatedly call this from an event loop.
You should normally not call this directly since it is called by
Face.processEvents.
If you call this from an main event loop, you may want to catch and
log/disregard all exceptions.
"""
if not self.getIsConnected():
return
# Loop until there is no more data in the receive buffer.
while True:
if not self._socketPoller.isReady():
# There is no data waiting.
return
nBytesRead, _ = self._socket.recvfrom_into(self._buffer)
if nBytesRead <= 0:
# Since we checked for data ready, we don't expect this.
return
# _bufferView is a memoryview, so we can slice efficienty.
self._elementReader.onReceivedData(self._bufferView[0:nBytesRead])
def getIsConnected(self):
"""
For UDP, there really is no connection, but just return True if
connect has been called.
:return: True if connected.
:rtype: bool
"""
if self._socket == None:
return False
# Assume we are still connected. TODO: Do a test receive?
return True
def close(self):
"""
Close the connection. If not connected, this does nothing.
"""
if self._socketPoller != None:
self._socketPoller.close()
self._socketPoller = None
if self._socket != None:
self._socket.close()
self._socket = None
class TcpTransport(Transport):
"""
Create a new TcpTransport in the unconnected state.
"""
def __init__(self):
self._socket = None
self._socketPoller = None
self._buffer = bytearray(Common.MAX_NDN_PACKET_SIZE)
# Create a Blob and take its buf() since this creates a memoryview
# which is more efficient for slicing.
self._bufferView = Blob(self._buffer, False).buf()
self._elementReader = None
self._connectionInfo = None
self._isLocal = False
class ConnectionInfo(Transport.ConnectionInfo):
"""
Create a new TcpTransport.ConnectionInfo which extends
Transport.ConnectionInfo to hold the host and port info for the TCP
connection.
:param str host: The host for the connection.
:param int port: (optional) The port number for the connection. If
omitted, use 6363.
"""
def __init__(self, host, port = 6363):
self._host = host
self._port = port
def getHost(self):
"""
Get the host given to the constructor.
:return: The host.
:rtype: str
"""
return self._host
def getPort(self):
"""
Get the port given to the constructor.
:return: The port.
:rtype: int
"""
return self._port
def isLocal(self, connectionInfo):
"""
Determine whether this transport connecting according to connectionInfo
is to a node on the current machine; results are cached. According to
http://redmine.named-data.net/projects/nfd/wiki/ScopeControl#local-face,
TCP transports with a loopback address are local. If connectionInfo
contains a host name, this will do a blocking DNS lookup; otherwise
this will parse the IP address and examine the first octet to determine
if it is a loopback address (e.g. the first IPv4 octet is 127 or IPv6 is
"::1").
:param TcpTransport.ConnectionInfo connectionInfo: A
TcpTransport.ConnectionInfo with the host to check.
:return: True if the host is local, False if not.
:rtype bool:
"""
if (self._connectionInfo == None or
self._connectionInfo.getHost() != connectionInfo.getHost()):
# Cache the result in _isLocal and save _connectionInfo for next time.
self._isLocal = self.getIsLocal(connectionInfo.getHost())
self._connectionInfo = connectionInfo
return self._isLocal
def connect(self, connectionInfo, elementListener, onConnected):
"""
Connect according to the info in connectionInfo, and use
elementListener.
:param TcpTransport.ConnectionInfo connectionInfo: A
TcpTransport.ConnectionInfo.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedElement
:param onConnected: This calls onConnected() when the connection is
established.
:type onConnected: function object
"""
self.close()
self._socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self._socket.connect(
(connectionInfo.getHost(), connectionInfo.getPort()))
self._socketPoller = SocketPoller(self._socket)
self._elementReader = ElementReader(elementListener)
onConnected()
# This will be set True if send gets a TypeError.
_sendNeedsStr = False
def send(self, data):
"""
Send data to the host.
:param data: The buffer of data to send.
:type data: An array type accepted by socket.send
"""
if TcpTransport._sendNeedsStr:
# This version of sendall can't use a memoryview, etc., so convert.
self._socket.sendall(str(bytearray(data)))
else:
try:
self._socket.sendall(data)
except TypeError:
# Assume we need to convert to a str.
TcpTransport._sendNeedsStr = True
self.send(data)
def processEvents(self):
"""
Process any data to receive. For each element received, call
elementListener.onReceivedElement.
This is non-blocking and will silently time out after a brief period if
there is no data to receive.
You should repeatedly call this from an event loop.
You should normally not call this directly since it is called by
Face.processEvents.
If you call this from an main event loop, you may want to catch and
log/disregard all exceptions.
"""
if not self.getIsConnected():
return
# Loop until there is no more data in the receive buffer.
while True:
if not self._socketPoller.isReady():
# There is no data waiting.
return
nBytesRead = self._socket.recv_into(self._buffer)
if nBytesRead <= 0:
# Since we checked for data ready, we don't expect this.
return
# _bufferView is a memoryview, so we can slice efficienty.
self._elementReader.onReceivedData(self._bufferView[0:nBytesRead])
def getIsConnected(self):
"""
Check if the transport is connected.
:return: True if connected.
:rtype: bool
"""
if self._socket == None:
return False
# Assume we are still connected. TODO: Do a test receive?
return True
def close(self):
"""
Close the connection. If not connected, this does nothing.
"""
if self._socketPoller != None:
self._socketPoller.close()
self._socketPoller = None
if self._socket != None:
self._socket.close()
self._socket = None
@staticmethod
def getIsLocal(host):
"""
A static method to determine whether the host is on the current machine.
Results are not cached.
http://redmine.named-data.net/projects/nfd/wiki/ScopeControl#local-face,
TCP transports with a loopback address are local. If connectionInfo
contains a host name, this will do a blocking DNS lookup; otherwise
this will parse the IP address and examine the first octet to determine
if it is a loopback address (e.g. the first IPv4 octet is 127 or IPv6 is
"::1").
:param str host: The host to check.
:return: True if the host is local, False if not.
:rtype bool:
"""
if host == "":
# Special case: For Python, "" means INADDR_ANY which is local.
return True
# Only look at the first result.
family, _, _, _, sockaddr = socket.getaddrinfo(
host, None, socket.AF_UNSPEC, socket.SOCK_STREAM)[0]
if family == socket.AF_INET:
# IPv4
address, _ = sockaddr
return address.startswith("127.")
else:
# IPv6
address, _, _, _ = sockaddr
return (address == "::1")
class TcpTransport(Transport):
"""
Create a new TcpTransport in the unconnected state.
"""
def __init__(self):
self._socket = None
self._socketPoller = None
self._buffer = bytearray(Common.MAX_NDN_PACKET_SIZE)
# Create a Blob and take its buf() since this creates a memoryview
# which is more efficient for slicing.
self._bufferView = Blob(self._buffer, False).buf()
self._elementReader = None
self._connectionInfo = None
self._isLocal = False
class ConnectionInfo(Transport.ConnectionInfo):
"""
Create a new TcpTransport.ConnectionInfo which extends
Transport.ConnectionInfo to hold the host and port info for the TCP
connection.
:param str host: The host for the connection.
:param int port: (optional) The port number for the connection. If
omitted, use 6363.
"""
def __init__(self, host, port=6363):
self._host = host
self._port = port
def getHost(self):
"""
Get the host given to the constructor.
:return: The host.
:rtype: str
"""
return self._host
def getPort(self):
"""
Get the port given to the constructor.
:return: The port.
:rtype: int
"""
return self._port
def isLocal(self, connectionInfo):
"""
Determine whether this transport connecting according to connectionInfo
is to a node on the current machine; results are cached. According to
http://redmine.named-data.net/projects/nfd/wiki/ScopeControl#local-face,
TCP transports with a loopback address are local. If connectionInfo
contains a host name, this will do a blocking DNS lookup; otherwise
this will parse the IP address and examine the first octet to determine
if it is a loopback address (e.g. the first IPv4 octet is 127 or IPv6 is
"::1").
:param TcpTransport.ConnectionInfo connectionInfo: A
TcpTransport.ConnectionInfo with the host to check.
:return: True if the host is local, False if not.
:rtype bool:
"""
if (self._connectionInfo == None
or self._connectionInfo.getHost() != connectionInfo.getHost()):
# Cache the result in _isLocal and save _connectionInfo for next time.
self._isLocal = self.getIsLocal(connectionInfo.getHost())
self._connectionInfo = connectionInfo
return self._isLocal
def isAsync(self):
"""
Override to return false since connect does not need to use the
onConnected callback.
:return: False
:rtype bool:
"""
return False
def connect(self, connectionInfo, elementListener, onConnected):
"""
Connect according to the info in connectionInfo, and use
elementListener.
:param TcpTransport.ConnectionInfo connectionInfo: A
TcpTransport.ConnectionInfo.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedElement
:param onConnected: This calls onConnected() when the connection is
established.
:type onConnected: function object
"""
self.close()
self._socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self._socket.connect(
(connectionInfo.getHost(), connectionInfo.getPort()))
self._socketPoller = SocketPoller(self._socket)
self._elementReader = ElementReader(elementListener)
if onConnected != None:
onConnected()
# This will be set True if send gets a TypeError.
_sendNeedsStr = False
def send(self, data):
"""
Send data to the host.
:param data: The buffer of data to send.
:type data: An array type accepted by socket.send
"""
if TcpTransport._sendNeedsStr:
# This version of sendall can't use a memoryview, etc., so convert.
self._socket.sendall(str(bytearray(data)))
else:
try:
self._socket.sendall(data)
except TypeError:
# Assume we need to convert to a str.
TcpTransport._sendNeedsStr = True
self.send(data)
def processEvents(self):
"""
Process any data to receive. For each element received, call
elementListener.onReceivedElement.
This is non-blocking and will silently time out after a brief period if
there is no data to receive.
You should repeatedly call this from an event loop.
You should normally not call this directly since it is called by
Face.processEvents.
If you call this from an main event loop, you may want to catch and
log/disregard all exceptions.
"""
if not self.getIsConnected():
return
# Loop until there is no more data in the receive buffer.
while True:
if not self._socketPoller.isReady():
# There is no data waiting.
return
nBytesRead = self._socket.recv_into(self._buffer)
if nBytesRead <= 0:
# Since we checked for data ready, we don't expect this.
return
# _bufferView is a memoryview, so we can slice efficienty.
self._elementReader.onReceivedData(self._bufferView[0:nBytesRead])
def getIsConnected(self):
"""
Check if the transport is connected.
:return: True if connected.
:rtype: bool
"""
if self._socket == None:
return False
# Assume we are still connected. TODO: Do a test receive?
return True
def close(self):
"""
Close the connection. If not connected, this does nothing.
"""
if self._socketPoller != None:
self._socketPoller.close()
self._socketPoller = None
if self._socket != None:
self._socket.close()
self._socket = None
@staticmethod
def getIsLocal(host):
"""
A static method to determine whether the host is on the current machine.
Results are not cached.
http://redmine.named-data.net/projects/nfd/wiki/ScopeControl#local-face,
TCP transports with a loopback address are local. If connectionInfo
contains a host name, this will do a blocking DNS lookup; otherwise
this will parse the IP address and examine the first octet to determine
if it is a loopback address (e.g. the first IPv4 octet is 127 or IPv6 is
"::1").
:param str host: The host to check.
:return: True if the host is local, False if not.
:rtype bool:
"""
if host == "":
# Special case: For Python, "" means INADDR_ANY which is local.
return True
# Only look at the first result.
family, _, _, _, sockaddr = socket.getaddrinfo(host, None,
socket.AF_UNSPEC,
socket.SOCK_STREAM)[0]
if family == socket.AF_INET:
# IPv4
address, _ = sockaddr
return address.startswith("127.")
else:
# IPv6
address, _, _, _ = sockaddr
return (address == "::1")
from pyndn.encoding.element_reader import ElementReader
from btle_node import BtleNode
from bluepy.btle import UUID, Peripheral, DefaultDelegate
service_uuid = UUID(0x2220)
my_uuid = UUID(0x2221)
p = Peripheral("EE:C5:46:65:D3:C1", "random")
def onBtleData(data):
print "got data: " + data.getName().toUri()
el = BtleNode(onBtleData, None, None)
em = ElementReader(el)
class MyDelegate(DefaultDelegate):
def __init__(self):
DefaultDelegate.__init__(self)
def handleNotification(self, cHandle, data):
em.onReceivedData(data[2:])
p.setDelegate(MyDelegate())
p.writeCharacteristic(
p.getCharacteristics(uuid=my_uuid)[0].valHandle + 1, "\x01\x00")
while True:
class UdpTransport(Transport):
"""
Create a new UdpTransport in the unconnected state.
"""
def __init__(self):
self._socket = None
self._poll = None
self._kqueue = None
self._kevents = None
self._buffer = bytearray(8000)
# Create a Blob and take its buf() since this creates a memoryview
# which is more efficient for slicing.
self._bufferView = Blob(self._buffer, False).buf()
self._elementReader = None
class ConnectionInfo(Transport.ConnectionInfo):
"""
Create a new UdpTransport.ConnectionInfo which extends
Transport.ConnectionInfo to hold the host and port info for the UDP
connection.
:param str host: The host for the connection.
:param int port: (optional) The port number for the connection. If
omitted, use 6363.
"""
def __init__(self, host, port = 6363):
self._host = host
self._port = port
def getHost(self):
"""
Get the host given to the constructor.
:return: The host.
:rtype: str
"""
return self._host
def getPort(self):
"""
Get the port given to the constructor.
:return: The port.
:rtype: int
"""
return self._port
def connect(self, connectionInfo, elementListener):
"""
Connect according to the info in connectionInfo, and use
elementListener.
:param UdpTransport.ConnectionInfo connectionInfo: A
UdpTransport.ConnectionInfo.
:param elementListener: The elementListener must remain valid during the
life of this object.
:type elementListener: An object with onReceivedData
"""
self.close()
# Save the _address to use in sendto.
self._address = (connectionInfo.getHost(), connectionInfo.getPort())
self._socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
if hasattr(select, "poll"):
# Set up _poll. (Ubuntu, etc.)
self._poll = select.poll()
self._poll.register(self._socket.fileno(), select.POLLIN)
elif hasattr(select, "kqueue"):
## Set up _kqueue. (BSD and OS X)
self._kqueue = select.kqueue()
self._kevents = [select.kevent(
self._socket.fileno(), filter = select.KQ_FILTER_READ,
flags = select.KQ_EV_ADD | select.KQ_EV_ENABLE |
select.KQ_EV_CLEAR)]
elif not hasattr(select, "select"):
# Most Python implementations have this fallback, so we
# don't expect this error.
raise RuntimeError("Cannot find a polling utility for sockets")
self._elementReader = ElementReader(elementListener)
# This will be set True if send gets a TypeError.
_sendNeedsStr = False
def send(self, data):
"""
Set data to the host.
:param data: The buffer of data to send.
:type data: An array type accepted by socket.send
"""
if UdpTransport._sendNeedsStr:
# This version of sendall can't use a memoryview, etc., so convert.
self._socket.sendto(str(bytearray(data)), self._address)
else:
try:
self._socket.sendto(data, self._address)
except TypeError:
# Assume we need to convert to a str.
UdpTransport._sendNeedsStr = True
self.send(data)
def processEvents(self):
"""
Process any data to receive. For each element received, call
elementListener.onReceivedElement.
This is non-blocking and will silently time out after a brief period if
there is no data to receive.
You should repeatedly call this from an event loop.
You should normally not call this directly since it is called by
Face.processEvents.
If you call this from an main event loop, you may want to catch and
log/disregard all exceptions.
"""
if not self.getIsConnected():
return
# Loop until there is no more data in the receive buffer.
while True:
if self._poll != None:
isReady = False
# Set timeout to 0 for an immediate check.
for (fd, pollResult) in self._poll.poll(0):
if pollResult > 0 and pollResult & select.POLLIN != 0:
isReady = True
break
if not isReady:
# There is no data waiting.
return
elif self._kqueue != None:
# Set timeout to 0 for an immediate check.
if len(self._kqueue.control(self._kevents, 1, 0)) == 0:
# There is no data waiting.
return
else:
# Use the select fallback which is less efficient.
# Set timeout to 0 for an immediate check.
isReady, _, _ = select.select([self._socket], [], [], 0)
if len(isReady) == 0:
# There is no data waiting.
return
nBytesRead, _ = self._socket.recvfrom_into(self._buffer)
if nBytesRead <= 0:
# Since we checked for data ready, we don't expect this.
return
# _bufferView is a memoryview, so we can slice efficienty.
self._elementReader.onReceivedData(self._bufferView[0:nBytesRead])
def getIsConnected(self):
"""
For UDP, there really is no connection, but just return True if
connect has been called.
:return: True if connected.
:rtype: bool
"""
if self._socket == None:
return False
# Assume we are still connected. TODO: Do a test receive?
return True
def close(self):
"""
Close the connection. If not connected, this does nothing.
"""
if self._socket != None:
if self._poll != None:
self._poll.unregister(self._socket.fileno())
self._poll = None
self._kqueue = None
self._kevents = None
self._socket.close()
self._socket = None