[sflow] Fix port_index_mapper.py script; Convert to Python 3 (#5800)
**- Why I did it** A memory issue was discovered during system test for scaling. The issue is documented here: https://docs.pyroute2.org/ipdb.html > One of the major issues with IPDB is its memory footprint. It proved not to be suitable for environments with thousands of routes or neighbours. Being a design issue, it could not be fixed, so a new module was started, NDB, that aims to replace IPDB. IPDB is still more feature rich, but NDB is already more fast and stable. **- How I did it** - Rewrote the port_index_mapper.py script to use dB events. - Convert to Python 3
This commit is contained in:
Garrick He
GitHub
parent
51292330e9
commit
27a911f16e
@ -1,114 +1,119 @@
|
||||
#!/usr/bin/env python
|
||||
#!/usr/bin/env python3
|
||||
|
||||
""" port_index_mapper
|
||||
A mapper service that watches for NetLink NEWLINK and DELLINKs
|
||||
to construct a PORT_INDEX_TABLE in state DB which includes the
|
||||
interface name, the interface index and the ifindex.
|
||||
|
||||
Note : Currently supports only interfaces supported by port_util.
|
||||
"""
|
||||
|
||||
import os
|
||||
import sys
|
||||
import syslog
|
||||
import signal
|
||||
import sys
|
||||
import traceback
|
||||
from pyroute2 import IPDB
|
||||
from pyroute2.iproute import RTM_NEWLINK, RTM_DELLINK
|
||||
from sonic_py_common.logger import Logger
|
||||
from socket import if_nametoindex
|
||||
from swsssdk import SonicV2Connector, port_util
|
||||
from swsscommon import swsscommon
|
||||
|
||||
PORT_INDEX_TABLE_NAME = 'PORT_INDEX_TABLE'
|
||||
SYSLOG_IDENTIFIER = 'port_index_mapper'
|
||||
|
||||
ipdb = None
|
||||
state_db = None
|
||||
# Global logger instance
|
||||
logger = Logger(SYSLOG_IDENTIFIER)
|
||||
logger.set_min_log_priority_info()
|
||||
|
||||
def set_port_index_table_entry(key, index, ifindex):
|
||||
state_db.set(state_db.STATE_DB, key, 'index', index)
|
||||
state_db.set(state_db.STATE_DB, key, 'ifindex', ifindex)
|
||||
class PortIndexMapper(object):
|
||||
|
||||
def interface_callback(ipdb, nlmsg, action):
|
||||
global state_db
|
||||
def __init__(self):
|
||||
REDIS_TIMEOUT_MS = 0
|
||||
# Update this list to support more interfaces
|
||||
tbl_lst = [swsscommon.STATE_PORT_TABLE_NAME,
|
||||
swsscommon.STATE_VLAN_TABLE_NAME]
|
||||
self.appl_db = swsscommon.DBConnector("STATE_DB",
|
||||
REDIS_TIMEOUT_MS,
|
||||
True)
|
||||
|
||||
try:
|
||||
msgtype = nlmsg['header']['type']
|
||||
if (msgtype != RTM_NEWLINK and msgtype != RTM_DELLINK):
|
||||
self.state_db = SonicV2Connector(host='127.0.0.1', decode_responses=True)
|
||||
self.state_db.connect(self.state_db.STATE_DB, False)
|
||||
self.sel = swsscommon.Select()
|
||||
self.tlbs = [swsscommon.SubscriberStateTable(self.appl_db, t)
|
||||
for t in tbl_lst]
|
||||
|
||||
self.cur_interfaces = {}
|
||||
|
||||
for t in self.tlbs:
|
||||
self.sel.addSelectable(t)
|
||||
|
||||
def set_port_index_table_entry(self, key, index, ifindex):
|
||||
self.state_db.set(self.state_db.STATE_DB, key, 'index', index)
|
||||
self.state_db.set(self.state_db.STATE_DB, key, 'ifindex', ifindex)
|
||||
|
||||
def update_db(self, ifname, op):
|
||||
index = port_util.get_index_from_str(ifname)
|
||||
if op == 'SET' and index is None:
|
||||
return
|
||||
ifindex = if_nametoindex(ifname)
|
||||
if op == 'SET' and ifindex is None:
|
||||
return
|
||||
|
||||
# filter out unwanted messages
|
||||
change = nlmsg['change']
|
||||
if (change != 0xFFFFFFFF):
|
||||
# Check if ifname already exist or if index/ifindex changed due to
|
||||
# syncd restart
|
||||
if (ifname in self.cur_interfaces and
|
||||
self.cur_interfaces[ifname] == (index, ifindex)):
|
||||
return
|
||||
|
||||
attrs = nlmsg['attrs']
|
||||
for list in attrs:
|
||||
if list[0] == 'IFLA_IFNAME':
|
||||
ifname = list[1]
|
||||
|
||||
_hash = '{}|{}'.format('PORT_INDEX_TABLE', ifname)
|
||||
|
||||
if op == 'SET':
|
||||
self.cur_interfaces[ifname] = (index, ifindex)
|
||||
self.set_port_index_table_entry(_hash, str(index), str(ifindex))
|
||||
elif op == 'DEL':
|
||||
del self.cur_interfaces[ifname]
|
||||
self.state_db.delete(self.state_db.STATE_DB, _hash)
|
||||
|
||||
def listen(self):
|
||||
SELECT_TIMEOUT_MS = -1 # Infinite wait
|
||||
|
||||
while True:
|
||||
(state, c) = self.sel.select(SELECT_TIMEOUT_MS)
|
||||
if state == swsscommon.Select.OBJECT:
|
||||
for t in self.tlbs:
|
||||
(key, op, cfvs) = t.pop()
|
||||
if op == 'DEL' and key in self.cur_interfaces:
|
||||
self.update_db(key, op)
|
||||
elif (op == 'SET' and key != 'PortInitDone' and
|
||||
key not in self.cur_interfaces):
|
||||
self.update_db(key, op)
|
||||
elif state == swsscomm.Select.ERROR:
|
||||
logger.log_error("Receieved error from select()")
|
||||
break
|
||||
|
||||
def populate(self):
|
||||
SELECT_TIMEOUT_MS = 0
|
||||
|
||||
while True:
|
||||
(state, c) = self.sel.select(SELECT_TIMEOUT_MS)
|
||||
if state == swsscommon.Select.OBJECT:
|
||||
for t in self.tlbs:
|
||||
(key, op, cfvs) = t.pop()
|
||||
if key and key != 'PortInitDone':
|
||||
self.update_db(key, op)
|
||||
else:
|
||||
return
|
||||
|
||||
# Extract the port index from the interface name
|
||||
index = port_util.get_index_from_str(ifname)
|
||||
if index is None:
|
||||
return
|
||||
|
||||
_hash = '{}|{}'.format(PORT_INDEX_TABLE_NAME, ifname)
|
||||
|
||||
if msgtype == RTM_NEWLINK:
|
||||
set_port_index_table_entry(_hash, str(index), nlmsg['index'])
|
||||
elif msgtype == RTM_DELLINK:
|
||||
state_db.delete(state_db.STATE_DB, _hash)
|
||||
break
|
||||
|
||||
except Exception, e:
|
||||
t = sys.exc_info()[2]
|
||||
traceback.print_tb(t)
|
||||
syslog.syslog(syslog.LOG_CRIT, "%s" % str(e))
|
||||
os.kill(os.getpid(), signal.SIGTERM)
|
||||
|
||||
def main():
|
||||
global state_db, ipdb
|
||||
state_db = SonicV2Connector(host='127.0.0.1')
|
||||
state_db.connect(state_db.STATE_DB, False)
|
||||
|
||||
ipdb = IPDB()
|
||||
|
||||
# Initialize the table at startup.
|
||||
ifnames = ipdb.by_name.keys()
|
||||
for ifname in ifnames:
|
||||
index = port_util.get_index_from_str(ifname)
|
||||
if index is None:
|
||||
continue
|
||||
ifindex = ipdb.interfaces[ifname]['index']
|
||||
_hash = '{}|{}'.format(PORT_INDEX_TABLE_NAME, ifname)
|
||||
set_port_index_table_entry(_hash, str(index), str(ifindex))
|
||||
|
||||
ipdb.register_callback(interface_callback)
|
||||
|
||||
signal.pause()
|
||||
|
||||
def signal_handler(signum, frame):
|
||||
syslog.syslog(syslog.LOG_NOTICE, "got signal %d" % signum)
|
||||
logger.log_notice("got signal {}".format(signum))
|
||||
sys.exit(0)
|
||||
|
||||
|
||||
def main():
|
||||
port_mapper = PortIndexMapper()
|
||||
port_mapper.populate()
|
||||
port_mapper.listen()
|
||||
|
||||
if __name__ == '__main__':
|
||||
rc = 0
|
||||
try:
|
||||
syslog.openlog(SYSLOG_IDENTIFIER)
|
||||
signal.signal(signal.SIGTERM, signal_handler)
|
||||
signal.signal(signal.SIGINT, signal_handler)
|
||||
main()
|
||||
except Exception, e:
|
||||
t = sys.exc_info()[2]
|
||||
traceback.print_tb(t)
|
||||
syslog.syslog(syslog.LOG_CRIT, "%s" % str(e))
|
||||
except Exception as e:
|
||||
tb = sys.exc_info()[2]
|
||||
traceback.print_tb(tb)
|
||||
logger.log_error("%s" % str(e))
|
||||
rc = -1
|
||||
finally:
|
||||
if ipdb is not None:
|
||||
ipdb.release()
|
||||
else:
|
||||
syslog.syslog(syslog.LOG_ERR, "ipdb undefined in signal_handler")
|
||||
|
||||
syslog.closelog()
|
||||
sys.exit(rc)
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user