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#!/router/bin/python
import json
import threading
import time
import datetime
import zmq
import re
import random
from .trex_stl_jsonrpc_client import JsonRpcClient, BatchMessage
from .utils.text_opts import *
from .trex_stl_stats import *
from .trex_stl_types import *
from .utils.zipmsg import ZippedMsg
# basic async stats class
class CTRexAsyncStats(object):
def __init__ (self):
self.ref_point = None
self.current = {}
self.last_update_ts = datetime.datetime.now()
def update (self, snapshot):
#update
self.last_update_ts = datetime.datetime.now()
self.current = snapshot
if self.ref_point == None:
self.ref_point = self.current
def clear(self):
self.ref_point = self.current
def get(self, field, format=False, suffix=""):
if not field in self.current:
return "N/A"
if not format:
return self.current[field]
else:
return format_num(self.current[field], suffix)
def get_rel (self, field, format=False, suffix=""):
if not field in self.current:
return "N/A"
if not format:
return (self.current[field] - self.ref_point[field])
else:
return format_num(self.current[field] - self.ref_point[field], suffix)
# return true if new data has arrived in the past 2 seconds
def is_online (self):
delta_ms = (datetime.datetime.now() - self.last_update_ts).total_seconds() * 1000
return (delta_ms < 2000)
# describes the general stats provided by TRex
class CTRexAsyncStatsGeneral(CTRexAsyncStats):
def __init__ (self):
super(CTRexAsyncStatsGeneral, self).__init__()
# per port stats
class CTRexAsyncStatsPort(CTRexAsyncStats):
def __init__ (self):
super(CTRexAsyncStatsPort, self).__init__()
def get_stream_stats (self, stream_id):
return None
# stats manager
class CTRexAsyncStatsManager():
def __init__ (self):
self.general_stats = CTRexAsyncStatsGeneral()
self.port_stats = {}
def get_general_stats(self):
return self.general_stats
def get_port_stats (self, port_id):
if not str(port_id) in self.port_stats:
return None
return self.port_stats[str(port_id)]
def update(self, data):
self.__handle_snapshot(data)
def __handle_snapshot(self, snapshot):
general_stats = {}
port_stats = {}
# filter the values per port and general
for key, value in snapshot.items():
# match a pattern of ports
m = re.search('(.*)\-([0-8])', key)
if m:
port_id = m.group(2)
field_name = m.group(1)
if not port_id in port_stats:
port_stats[port_id] = {}
port_stats[port_id][field_name] = value
else:
# no port match - general stats
general_stats[key] = value
# update the general object with the snapshot
self.general_stats.update(general_stats)
# update all ports
for port_id, data in port_stats.items():
if not port_id in self.port_stats:
self.port_stats[port_id] = CTRexAsyncStatsPort()
self.port_stats[port_id].update(data)
class CTRexAsyncClient():
THREAD_STATE_ACTIVE = 1
THREAD_STATE_ZOMBIE = 2
THREAD_STATE_DEAD = 3
def __init__ (self, server, port, stateless_client):
self.port = port
self.server = server
self.stateless_client = stateless_client
self.event_handler = stateless_client.event_handler
self.logger = self.stateless_client.logger
self.raw_snapshot = {}
self.stats = CTRexAsyncStatsManager()
self.last_data_recv_ts = 0
self.async_barrier = None
self.monitor = AsyncUtil()
self.connected = False
self.zipped = ZippedMsg()
self.t_state = self.THREAD_STATE_DEAD
# connects the async channel
def connect (self):
if self.connected:
self.disconnect()
self.tr = "tcp://{0}:{1}".format(self.server, self.port)
# Socket to talk to server
self.context = zmq.Context()
self.socket = self.context.socket(zmq.SUB)
# before running the thread - mark as active
self.t_state = self.THREAD_STATE_ACTIVE
self.t = threading.Thread(target = self._run)
# kill this thread on exit and don't add it to the join list
self.t.setDaemon(True)
self.t.start()
self.connected = True
# first barrier - make sure async thread is up
rc = self.barrier()
if not rc:
self.disconnect()
return rc
# second barrier - sync all stats data as a baseline from the server
rc = self.barrier(baseline = True)
if not rc:
self.disconnect()
return rc
return RC_OK()
# disconnect
def disconnect (self):
if not self.connected:
return
# mark for join
self.t_state = self.THREAD_STATE_DEAD
self.context.term()
self.t.join()
# done
self.connected = False
# set the thread as a zombie (in case of server death)
def set_as_zombie (self):
self.last_data_recv_ts = None
self.t_state = self.THREAD_STATE_ZOMBIE
# thread function
def _run (self):
# socket must be created on the same thread
self.socket.setsockopt(zmq.SUBSCRIBE, b'')
self.socket.setsockopt(zmq.RCVTIMEO, 5000)
self.socket.connect(self.tr)
got_data = False
self.monitor.reset()
while self.t_state != self.THREAD_STATE_DEAD:
try:
with self.monitor:
line = self.socket.recv()
# last data recv.
self.last_data_recv_ts = time.time()
# if thread was marked as zomibe - it does nothing besides fetching messages
if self.t_state == self.THREAD_STATE_ZOMBIE:
continue
self.monitor.on_recv_msg(line)
# try to decomrpess
unzipped = self.zipped.decompress(line)
if unzipped:
line = unzipped
line = line.decode()
# signal once
if not got_data:
self.event_handler.on_async_alive()
got_data = True
# got a timeout - mark as not alive and retry
except zmq.Again:
# signal once
if got_data:
self.event_handler.on_async_dead()
self.set_as_zombie()
got_data = False
continue
except zmq.ContextTerminated:
# outside thread signaled us to exit
assert(self.t_state != self.THREAD_STATE_ACTIVE)
break
msg = json.loads(line)
name = msg['name']
data = msg['data']
type = msg['type']
baseline = msg.get('baseline', False)
self.raw_snapshot[name] = data
self.__dispatch(name, type, data, baseline)
# closing of socket must be from the same thread
self.socket.close(linger = 0)
# return True if the subscriber got data in the last 3 seconds
# even if zombie - will return true if got data
def is_alive (self):
# maybe the thread has exited with exception
if not self.t.is_alive():
return False
# simply no data
if self.last_data_recv_ts == None:
return False
# timeout of data
return ( (time.time() - self.last_data_recv_ts) < 3 )
# more granular than active - it means that thread state is active we get info
# zomibes will return false
def is_active (self):
return self.is_alive() and self.t_state == self.THREAD_STATE_ACTIVE
def get_stats (self):
return self.stats
def get_raw_snapshot (self):
return self.raw_snapshot
# dispatch the message to the right place
def __dispatch (self, name, type, data, baseline):
# stats
if name == "trex-global":
self.event_handler.on_async_stats_update(data, baseline)
# events
elif name == "trex-event":
self.event_handler.on_async_event(type, data)
# barriers
elif name == "trex-barrier":
self.handle_async_barrier(type, data)
elif name == "flow_stats":
self.event_handler.on_async_rx_stats_event(data, baseline)
elif name == "latency_stats":
self.event_handler.on_async_latency_stats_event(data, baseline)
else:
pass
# async barrier handling routine
def handle_async_barrier (self, type, data):
if self.async_barrier['key'] == type:
self.async_barrier['ack'] = True
# block on barrier for async channel
def barrier(self, timeout = 5, baseline = False):
# set a random key
key = random.getrandbits(32)
self.async_barrier = {'key': key, 'ack': False}
# expr time
expr = time.time() + timeout
while not self.async_barrier['ack']:
# inject
rc = self.stateless_client._transmit("publish_now", params = {'key' : key, 'baseline': baseline})
if not rc:
return rc
# fast loop
for i in range(0, 100):
if self.async_barrier['ack']:
break
time.sleep(0.001)
if time.time() > expr:
return RC_ERR("*** [subscriber] - timeout - no data flow from server at : " + self.tr)
return RC_OK()
# a class to measure util. of async subscriber thread
class AsyncUtil(object):
STATE_SLEEP = 1
STATE_AWAKE = 2
def __init__ (self):
self.reset()
def reset (self):
self.state = self.STATE_AWAKE
self.clock = time.time()
# reset the current interval
self.interval = {'ts': time.time(), 'total_sleep': 0, 'total_bits': 0}
# global counters
self.cpu_util = 0
self.bps = 0
def on_recv_msg (self, message):
self.interval['total_bits'] += len(message) * 8.0
self._tick()
def __enter__ (self):
assert(self.state == self.STATE_AWAKE)
self.state = self.STATE_SLEEP
self.sleep_start_ts = time.time()
def __exit__(self, exc_type, exc_val, exc_tb):
assert(self.state == self.STATE_SLEEP)
self.state = self.STATE_AWAKE
# measure total sleep time for interval
self.interval['total_sleep'] += time.time() - self.sleep_start_ts
self._tick()
def _tick (self):
# how much time did the current interval lasted
ts = time.time() - self.interval['ts']
if ts < 1:
return
# if tick is in the middle of sleep - add the interval and reset
if self.state == self.STATE_SLEEP:
self.interval['total_sleep'] += time.time() - self.sleep_start_ts
self.sleep_start_ts = time.time()
# add the interval
if self.interval['total_sleep'] > 0:
# calculate
self.cpu_util = self.cpu_util * 0.75 + (float(ts - self.interval['total_sleep']) / ts) * 0.25
self.interval['total_sleep'] = 0
if self.interval['total_bits'] > 0:
# calculate
self.bps = self.bps * 0.75 + ( self.interval['total_bits'] / ts ) * 0.25
self.interval['total_bits'] = 0
# reset the interval's clock
self.interval['ts'] = time.time()
def get_cpu_util (self):
self._tick()
return (self.cpu_util * 100)
def get_bps (self):
self._tick()
return (self.bps)
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