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[write_standby] update write_standby.py script (#11650)

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Why I did it
The initial value has to be present for the state machines to work. In active-standby dual-tor scenario, or any hardware mux scenario, the value will be updtaed eventually with a delay.

However, in active-active dual-tor scenario, there is no other mechanism to initialize the value and get state machines started.
So this script will have to write something at start up time.

For active-active dualtor, 'active' is a more preferred initial value, the state machine will switch the state to standby soon if
link prober found link not in good state.

How I did it
Update the script to always provide initial values.

How to verify it
Tested on active-active dual-tor testbed.

Signed-off-by: Ying Xie ying.xie@microsoft.com
This commit is contained in:
Ying Xie 2022-08-09 14:21:29 -07:00 committed by Qi Luo
parent 9d3194c77a
commit 4ab83170a5
1 changed files with 33 additions and 12 deletions
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45
files/scripts/write_standby.py
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@ -1,5 +1,6 @@
#!/usr/bin/env python3
import argparse
import time
from sonic_py_common import logger as log
@ -19,11 +20,13 @@ class MuxStateWriter(object):
Class used to write standby mux state to APP DB
"""
def __init__(self):
def __init__(self, activeactive, activestandby):
self.config_db_connector = None
self.appl_db_connector = None
self.state_db_connector = None
self.asic_db_connector = None
self.default_active_active_state = activeactive
self.default_active_standby_state = activestandby
@property
def config_db(self):
@ -96,14 +99,25 @@ class MuxStateWriter(object):
return status and value == 'true'
def get_auto_mux_intfs(self):
def get_all_mux_intfs_modes(self):
"""
Returns a list of all mux cable interfaces that are configured to auto-switch
Returns a list of all mux cable interfaces, with suggested modes
Setting mux initial modes is crucial to kick off the statemachines,
have to set the modes for all mux/gRPC ports.
"""
intf_modes = {}
all_intfs = self.config_db.get_table('MUX_CABLE')
auto_intfs = [intf for intf, status in all_intfs.items()
if status['state'].lower() == 'auto']
return auto_intfs
for intf, status in all_intfs.items():
state = status['state'].lower()
if state in ['active', 'standby']:
intf_modes[intf] = state
elif state in ['auto', 'manual']:
if ('soc_ipv4' in status or 'soc_ipv6' in status or
('cable_type' in status and status['cable_type'] == 'active-active')):
intf_modes[intf] = self.default_active_active_state
else:
intf_modes[intf] = self.default_active_standby_state
return intf_modes
def tunnel_exists(self):
"""
@ -144,19 +158,26 @@ class MuxStateWriter(object):
logger.log_warning("Skip setting mux state due to ongoing warmrestart.")
return
intfs = self.get_auto_mux_intfs()
state = 'standby'
modes = self.get_all_mux_intfs_modes()
if self.wait_for_tunnel():
logger.log_warning("Applying {} state to interfaces {}".format(state, intfs))
logger.log_warning("Applying state to interfaces {}".format(modes))
producer_state_table = ProducerStateTable(self.appl_db, 'MUX_CABLE_TABLE')
fvs = create_fvs(state=state)
for intf in intfs:
for intf, state in modes.items():
fvs = create_fvs(state=state)
producer_state_table.set(intf, fvs)
else:
logger.log_error("Timed out waiting for tunnel {}, mux state will not be written".format(self.tunnel_name))
if __name__ == '__main__':
mux_writer = MuxStateWriter()
parser = argparse.ArgumentParser(description='Write initial mux state')
parser.add_argument('-a', '--active_active',
help='state: intial state for "auto" and/or "manual" config in active-active mode, default "active"',
type=str, required=False, default='active')
parser.add_argument('-s', '--active_standby',
help='state: intial state for "auto" and/or "manual" config in active-standby mode, default "standby"',
type=str, required=False, default='standby')
args = parser.parse_args()
mux_writer = MuxStateWriter(activeactive=args.active_active, activestandby=args.active_standby)
mux_writer.apply_mux_config()