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Fix: No explicit reading ConfigDB in get_asic_conf_file_path() (#10723)

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#### Why I did it
This function is critical for is_multi_asic() and SonicDBConfig initializing. No explicit reading ConfigDB. Otherwise it will implicitly trigger SonicDBConfig initializing.

#### How I did it
1. No explicit reading ConfigDB in get_asic_conf_file_path()
2. Collect asic_conf_path_candidates lazily to prevent any unnecessary side effect and improve the performance
This commit is contained in:
Qi Luo 2022-05-06 14:22:23 -07:00 committed by GitHub
parent 322363b9ab
commit 45c5ca089c
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 43 additions and 56 deletions
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66
src/sonic-py-common/sonic_py_common/device_info.py
View File

@ -40,11 +40,12 @@ CHASSIS_INFO_SERIAL_FIELD = 'serial'
CHASSIS_INFO_MODEL_FIELD = 'model'
CHASSIS_INFO_REV_FIELD = 'revision'
def get_localhost_info(field):
def get_localhost_info(field, config_db=None):
try:
config_db = ConfigDBConnector()
config_db.connect()
# TODO: enforce caller to provide config_db explicitly and remove its default value
if not config_db:
config_db = ConfigDBConnector()
config_db.connect()
metadata = config_db.get_table('DEVICE_METADATA')
@ -81,11 +82,16 @@ def get_machine_info():
return machine_vars
def get_platform():
def get_platform(**kwargs):
"""
Retrieve the device's platform identifier
Args:
config_db: a connected ConfigDBConector object.
If explicit None provided, this function will not read ConfigDB. This is useful before SonicDBConfig initializing.
If not provided, this function may implicitly ready ConfigDB.
Otherwise, this function will use it to read ConfigDB
Returns:
A string containing the device's platform identifier
"""
@ -111,8 +117,13 @@ def get_platform():
# container in SONiC, where the /host directory is not mounted. In this
# case the value should already be populated in Config DB so we finally
# try reading it from there.
return get_localhost_info('platform')
if 'config_db' in kwargs:
config_db = kwargs['config_db']
if config_db is None:
return None
else:
config_db = None
return get_localhost_info('platform', config_db=config_db)
def get_hwsku():
@ -144,21 +155,22 @@ def get_platform_and_hwsku():
def get_asic_conf_file_path():
"""
Retrieves the path to the ASIC conguration file on the device
Retrieves the path to the ASIC configuration file on the device
Returns:
A string containing the path to the ASIC conguration file on success,
A string containing the path to the ASIC configuration file on success,
None on failure
"""
asic_conf_path_candidates = []
def asic_conf_path_candidates():
yield os.path.join(CONTAINER_PLATFORM_PATH, ASIC_CONF_FILENAME)
asic_conf_path_candidates.append(os.path.join(CONTAINER_PLATFORM_PATH, ASIC_CONF_FILENAME))
# Note: this function is critical for is_multi_asic() and SonicDBConfig initializing
# No explicit reading ConfigDB
platform = get_platform(config_db=None)
if platform:
yield os.path.join(HOST_DEVICE_PATH, platform, ASIC_CONF_FILENAME)
platform = get_platform()
if platform:
asic_conf_path_candidates.append(os.path.join(HOST_DEVICE_PATH, platform, ASIC_CONF_FILENAME))
for asic_conf_file_path in asic_conf_path_candidates:
for asic_conf_file_path in asic_conf_path_candidates():
if os.path.isfile(asic_conf_file_path):
return asic_conf_file_path
@ -167,10 +179,10 @@ def get_asic_conf_file_path():
def get_platform_env_conf_file_path():
"""
Retrieves the path to the PLATFORM ENV conguration file on the device
Retrieves the path to the PLATFORM ENV configuration file on the device
Returns:
A string containing the path to the PLATFORM ENV conguration file on success,
A string containing the path to the PLATFORM ENV configuration file on success,
None on failure
"""
platform_env_conf_path_candidates = []
@ -339,7 +351,7 @@ def get_sonic_version_file():
# Get hardware information
def get_platform_info():
def get_platform_info(config_db=None):
"""
This function is used to get the HW info helper function
"""
@ -356,8 +368,10 @@ def get_platform_info():
hw_info_dict['asic_count'] = get_num_asics()
try:
config_db = ConfigDBConnector()
config_db.connect()
# TODO: enforce caller to provide config_db explicitly and remove its default value
if not config_db:
config_db = ConfigDBConnector()
config_db.connect()
metadata = config_db.get_table('DEVICE_METADATA')["localhost"]
switch_type = metadata.get('switch_type')
@ -462,7 +476,7 @@ def get_namespaces():
return natsorted(ns_list)
def get_all_namespaces():
def get_all_namespaces(config_db=None):
"""
In case of Multi-Asic platform, Each ASIC will have a linux network namespace created.
So we loop through the databases in different namespaces and depending on the sub_role
@ -476,8 +490,10 @@ def get_all_namespaces():
if is_multi_npu():
for npu in range(num_npus):
namespace = "{}{}".format(NPU_NAME_PREFIX, npu)
config_db = ConfigDBConnector(use_unix_socket_path=True, namespace=namespace)
config_db.connect()
# TODO: enforce caller to provide config_db explicitly and remove its default value
if not config_db:
config_db = ConfigDBConnector(use_unix_socket_path=True, namespace=namespace)
config_db.connect()
metadata = config_db.get_table('DEVICE_METADATA')
if metadata['localhost']['sub_role'] == FRONTEND_ASIC_SUB_ROLE:

33
src/sonic-py-common/sonic_py_common/multi_asic.py
View File

@ -5,11 +5,8 @@ import subprocess
from natsort import natsorted
from swsscommon import swsscommon
from .device_info import CONTAINER_PLATFORM_PATH
from .device_info import HOST_DEVICE_PATH
from .device_info import get_platform
from .device_info import is_supervisor
from .device_info import is_chassis
from .device_info import get_asic_conf_file_path
from .device_info import is_supervisor, is_chassis
ASIC_NAME_PREFIX = 'asic'
NAMESPACE_PATH_GLOB = '/run/netns/*'
@ -78,32 +75,6 @@ def connect_to_all_dbs_for_ns(namespace=DEFAULT_NAMESPACE):
db.connect(db_id)
return db
def get_asic_conf_file_path():
"""
Retrieves the path to the ASIC conguration file on the device
Returns:
A string containing the path to the ASIC conguration file on success,
None on failure
"""
asic_conf_path_candidates = []
asic_conf_path_candidates.append(os.path.join(CONTAINER_PLATFORM_PATH,
ASIC_CONF_FILENAME))
platform = get_platform()
if platform:
asic_conf_path_candidates.append(os.path.join(
HOST_DEVICE_PATH, platform, ASIC_CONF_FILENAME))
for asic_conf_file_path in asic_conf_path_candidates:
if os.path.isfile(asic_conf_file_path):
return asic_conf_file_path
return None
def get_num_asics():
"""
Retrieves the num of asics present in the multi ASIC platform