def _oldest_packet_find(self):
# Find port with oldest packet
min_time = 0
min_port = -1
for port_number in self.port_list.keys():
ptime = self.port_list[port_number].timestamp_head()
if ptime:
if (min_port == -1) or (ptime < min_time):
min_time = ptime
min_port = port_number
oft_assert(min_port != -1, "Could not find port when pkts pending")
return min_port
def _oldest_packet_find(self):
# Find port with oldest packet
min_time = 0
min_port = -1
for port_number in self.port_list.keys():
ptime = self.port_list[port_number].timestamp_head()
if ptime:
if (min_port == -1) or (ptime < min_time):
min_time = ptime
min_port = port_number
oft_assert(min_port != -1, "Could not find port when pkts pending")
return min_port
def poll(self, port_number=None, timeout=None):
"""
Poll one or all dataplane ports for a packet
If port_number is given, get the oldest packet from that port.
Otherwise, find the port with the oldest packet and return
that packet.
@param port_number If set, get packet from this port
@param timeout If positive and no packet is available, block
until a packet is received or for this many seconds
@return The triple port_number, packet, pkt_time where packet
is received from port_number at time pkt_time. If a timeout
occurs, return None, None, None
"""
self.pkt_sync.acquire()
# Check if requested specific port and it has a packet
if port_number and len(self.port_list[port_number].packets) != 0:
pkt, time = self.port_list[port_number].dequeue(use_lock=False)
self.pkt_sync.release()
oft_assert(pkt,
"Poll: packet not found on port " + str(port_number))
return port_number, pkt, time
# Check if requested any port and some packet pending
if not port_number and self.packets_pending != 0:
port = self._oldest_packet_find()
pkt, time = self.port_list[port].dequeue(use_lock=False)
self.pkt_sync.release()
oft_assert(pkt, "Poll: oldest packet not found")
return port, pkt, time
# No packet pending; blocking call requested?
if not timeout:
self.pkt_sync.release()
return None, None, None
# Desired packet isn't available and timeout is specified
# Already holding pkt_sync; wait on pkt_sync variable
self.want_pkt = True
self.want_pkt_port = port_number
self.got_pkt_port = None
self.pkt_sync.wait(timeout)
self.want_pkt = False
if self.got_pkt_port:
pkt, time = \
self.port_list[self.got_pkt_port].dequeue(use_lock=False)
self.pkt_sync.release()
oft_assert(
pkt, "Poll: pkt reported, but not found at " +
str(self.got_pkt_port))
return self.got_pkt_port, pkt, time
self.pkt_sync.release()
self.logger.debug("Poll time out, no packet from " + str(port_number))
return None, None, None
def poll(self, port_number=None, timeout=None):
"""
Poll one or all dataplane ports for a packet
If port_number is given, get the oldest packet from that port.
Otherwise, find the port with the oldest packet and return
that packet.
@param port_number If set, get packet from this port
@param timeout If positive and no packet is available, block
until a packet is received or for this many seconds
@return The triple port_number, packet, pkt_time where packet
is received from port_number at time pkt_time. If a timeout
occurs, return None, None, None
"""
self.pkt_sync.acquire()
# Check if requested specific port and it has a packet
if port_number and len(self.port_list[port_number].packets) != 0:
pkt, time = self.port_list[port_number].dequeue(use_lock=False)
self.pkt_sync.release()
oft_assert(pkt, "Poll: packet not found on port " +
str(port_number))
return port_number, pkt, time
# Check if requested any port and some packet pending
if not port_number and self.packets_pending != 0:
port = self._oldest_packet_find()
pkt, time = self.port_list[port].dequeue(use_lock=False)
self.pkt_sync.release()
oft_assert(pkt, "Poll: oldest packet not found")
return port, pkt, time
# No packet pending; blocking call requested?
if not timeout:
self.pkt_sync.release()
return None, None, None
# Desired packet isn't available and timeout is specified
# Already holding pkt_sync; wait on pkt_sync variable
self.want_pkt = True
self.want_pkt_port = port_number
self.got_pkt_port = None
self.pkt_sync.wait(timeout)
self.want_pkt = False
if self.got_pkt_port:
pkt, time = \
self.port_list[self.got_pkt_port].dequeue(use_lock=False)
self.pkt_sync.release()
oft_assert(pkt, "Poll: pkt reported, but not found at " +
str(self.got_pkt_port))
return self.got_pkt_port, pkt, time
self.pkt_sync.release()
self.logger.debug("Poll time out, no packet from " + str(port_number))
return None, None, None
def _oldest_packet_find(self):
# Find port with oldest packet
oft_assert(min_port != -1, "Could not find port when pkts pending")
return min_port
