If bridge_master.py is killed with HUP:

write config and bridge state to disk.

If, when started again, state files are less that 25 seconds old
load these instead of parsing freedmr.cfg and rules.py

This means, it's possible to effect a seamless restart, without causing
systems to have to re-login.

FreeDMR-SAMPLE-commented.cfg

@@ -4,7 +4,13 @@
 #           - how often the Master maintenance loop runs
 # MAX_MISSED - how many pings are missed before we give up and re-register
 #           - number of times the master maintenance loop runs before de-registering a peer
+# You should not need to change this from the default. 
 #
+# GEN_STAT_BRIDGES -    Generate static bridges to forward traffic to other connected servers.
+#                       Generally this should be left True, unless you are building a hidden server
+#                       Which does not participate in the mesh network
+#
+# ALLOW_NULL_PASSPHRASE
 # ACLs:
 #
 # Access Control Lists are a very powerful tool for administering your system.
@@ -45,7 +51,7 @@ REG_ACL: PERMIT:ALL
 SUB_ACL: DENY:1
 TGID_TS1_ACL: PERMIT:ALL
 TGID_TS2_ACL: PERMIT:ALL
-GEN_STAT_BRIDGES: False
+GEN_STAT_BRIDGES: True
 ALLOW_NULL_PASSPHRASE: True
 ANNOUNCEMENT_LANGUAGES:
 SERVER_ID: 0000

bridge_master.py

@@ -409,6 +409,24 @@ def subMapWrite():
     except:
         logger.warning('(SUBSCRIBER) Cannot write SUB_MAP to file')
         
+def configPickle():
+    try:
+        _fh = open('config.pkl','wb')
+        pickle.dump(CONFIG,_fh)
+        _fh.close()
+        logger.info('(GLOBAL) Writing CONFIG to disk')
+    except:
+        logger.warning('(GLOBAL) Cannot write config.pkl')
+  
+def bridgePickle():
+    try:
+        _fh = open('bridge.pkl','wb')
+        pickle.dump(BRIDGES,_fh)
+        _fh.close()
+        logger.info('(GLOBAL) Writing BRIDGES to disk')
+    except:
+        logger.warning('(GLOBAL) Cannot write bridge.pkl')
+        
 #Subscriber Map trimmer loop
 def SubMapTrimmer():
     logger.debug('(SUBSCRIBER) Subscriber Map trimmer loop started')
@@ -2828,7 +2846,19 @@ if __name__ == '__main__':
     if not cli_args.CONFIG_FILE:
         cli_args.CONFIG_FILE = os.path.dirname(os.path.abspath(__file__))+'/hblink.cfg'
 
-    # Call the external routine to build the configuration dictionary
+    file_exists = os.path.isfile('config.pkl') == True
+    if file_exists:
+        if os.path.getmtime('config.pkl') > (time() - 25):
+            try:
+                with open('config.pkl','rb') as _fh:
+                    CONFIG = pickle.load(_fh)
+                    print('(CONFIG) loaded config .pkl from previous shutdown')
+            except:
+                print('(CONFIG) Cannot load config.pkl file')
+                CONFIG = config.build_config(cli_args.CONFIG_FILE)
+        else:
+            os.unlink("config.pkl")
+    else:
         CONFIG = config.build_config(cli_args.CONFIG_FILE)
 
     # Ensure we have a path for the rules file, if one wasn't specified, then use the default (top of file)
@@ -2883,9 +2913,13 @@ if __name__ == '__main__':
         reactor.stop()
         if CONFIG['ALIASES']['SUB_MAP_FILE']:
             subMapWrite()
+        if _signal == signal.SIGHUP:
+            configPickle()
+            bridgePickle()
+            
 
     # Set signal handers so that we can gracefully exit if need be
-    for sig in [signal.SIGINT, signal.SIGTERM]:
+    for sig in [signal.SIGINT, signal.SIGTERM, signal.SIGHUP]:
         signal.signal(sig, sig_handler)
 
     # Create the name-number mapping dictionaries
@@ -2911,8 +2945,22 @@ if __name__ == '__main__':
     except (ImportError, FileNotFoundError):
         sys.exit('(ROUTER) TERMINATING: Routing bridges file not found or invalid: {}'.format(cli_args.RULES_FILE))
 
-    # Build the routing rules file
+    #Load pickle of bridges if it's less than 25 seconds old 
+    if os.path.isfile('bridge.pkl'):
+        if os.path.getmtime('config.pkl') > (time() - 25):
+            try:
+                with open('bridge.pkl','rb') as _fh:
+                    BRIDGES = pickle.load(_fh)
+                    logger.info('(BRIDGE) loaded bridge.pkl from previous shutdown')
+            except:
+                logger.warning('(BRIDGE) Cannot load bridge.pkl file')
                 BRIDGES = make_bridges(rules_module.BRIDGES)
+        else:
+            BRIDGES = make_bridges(rules_module.BRIDGES)
+        os.unlink("bridge.pkl")
+    else:
+       BRIDGES = make_bridges(rules_module.BRIDGES) 
+
     
     #Subscriber map for unit calls - complete with test entry
     #SUB_MAP = {bytes_3(73578):('REP-1',1,time())}