Add log rotation configuration mechanism

* Handle changes in LOGGING table

Signed-off-by: Yevhen Fastiuk <yfastiuk@nvidia.com>

scripts/hostcfgd

@@ -1890,6 +1890,43 @@ class FipsCfg(object):
         syslog.syslog(syslog.LOG_INFO, f'FipsCfg: update the FIPS enforce option {self.enforce}.')
         loader.set_fips(image, self.enforce)
 
+class LoggingCfg(object):
+    """Logging Config Daemon
+
+    Handles changes in LOGGING table.
+    1) Handle change of debug/syslog log files config
+    """
+    def __init__(self):
+        self.cache = {}
+
+    def load(self, logging_cfg={}):
+        # Get initial logging file configuration
+        self.cache = logging_cfg
+        syslog.syslog(syslog.LOG_DEBUG, f'Initial logging config: {self.cache}')
+
+    def update_logging_cfg(self, key, data):
+        """Apply logging configuration
+
+        The daemon restarts logrotate-config which will regenerate logrotate
+        config files.
+        Args:
+            key:    DB table's key that was triggered change (basically it is a
+                    config file)
+            data:   File's config data
+        """
+        syslog.syslog(syslog.LOG_DEBUG, 'LoggingCfg: logging files cfg update')
+        if self.cache.get(key) != data:
+            syslog.syslog(syslog.LOG_INFO,
+                          f'Set logging file {key} config: {data}')
+            try:
+                run_cmd('sudo systemctl restart logrotate-config', True, True)
+            except Exception:
+                syslog.syslog(syslog.LOG_ERR, f'Failed to update {key} message')
+                return
+
+        # Update cache
+        self.cache[key] = data
+
 class HostConfigDaemon:
     def __init__(self):
         self.state_db_conn = DBConnector(STATE_DB, 0)
@@ -1952,6 +1989,9 @@ class HostConfigDaemon:
         # Initialize FipsCfg
         self.fipscfg = FipsCfg(self.state_db_conn)
 
+        # Initialize LoggingCfg
+        self.loggingcfg = LoggingCfg()
+
     def load(self, init_data):
         features = init_data['FEATURE']
         aaa = init_data['AAA']
@@ -1972,6 +2012,7 @@ class HostConfigDaemon:
         syslog_srv = init_data.get(swsscommon.CFG_SYSLOG_SERVER_TABLE_NAME, {})
         dns = init_data.get('DNS_NAMESERVER', {})
         fips_cfg = init_data.get('FIPS', {})
+        logging = init_data.get('LOGGING', {})
 
         self.feature_handler.sync_state_field(features)
         self.aaacfg.load(aaa, tacacs_global, tacacs_server, radius_global, radius_server)
@@ -1982,10 +2023,10 @@ class HostConfigDaemon:
         self.sshscfg.load(ssh_server)
         self.devmetacfg.load(dev_meta)
         self.mgmtifacecfg.load(mgmt_ifc, mgmt_vrf)
-
         self.rsyslogcfg.load(syslog_cfg, syslog_srv)
         self.dnscfg.load(dns)
         self.fipscfg.load(fips_cfg)
+        self.loggingcfg.load(logging)
 
         # Update AAA with the hostname
         self.aaacfg.hostname_update(self.devmetacfg.hostname)
@@ -2114,6 +2155,10 @@ class HostConfigDaemon:
         data = self.config_db.get_table("FIPS")
         self.fipscfg.fips_handler(data)
 
+    def logging_handler(self, key, op, data):
+        syslog.syslog(syslog.LOG_INFO, 'LOGGING table handler...')
+        self.loggingcfg.update_logging_cfg(key, data)
+
     def wait_till_system_init_done(self):
         # No need to print the output in the log file so using the "--quiet"
         # flag
@@ -2173,6 +2218,10 @@ class HostConfigDaemon:
         # Handle FIPS changes
         self.config_db.subscribe('FIPS', make_callback(self.fips_config_handler))
 
+        # Handle LOGGING changes
+        self.config_db.subscribe(swsscommon.CFG_LOGGING_TABLE_NAME,
+                                 make_callback(self.logging_handler))
+
         syslog.syslog(syslog.LOG_INFO,
                       "Waiting for systemctl to finish initialization")
         self.wait_till_system_init_done()