add daemonising code

[zanchey/dispense2.git] / sql-edition / servers / VendServer.py

diff --git a/sql-edition/servers/VendServer.py b/sql-edition/servers/VendServer.py
index 198b109..3c3aee6 100755 (executable)
--- a/sql-edition/servers/VendServer.py
+++ b/sql-edition/servers/VendServer.py
@@ -4,7 +4,8 @@
 USE_DB = 0
 
 import ConfigParser
-import sys, os, string, re, pwd
+import sys, os, string, re, pwd, signal
+from traceback import print_tb
 if USE_DB: import pg
 from time import time, sleep
 from popen2 import popen2
@@ -14,7 +15,7 @@ from HorizScroll import HorizScroll
 from random import random, seed
 from Idler import TrainIdler,GrayIdler
 import socket
-from traceback import print_tb
+from posix import geteuid
 
 GREETING = 'UCC SNACKS'
 PIN_LENGTH = 4
@@ -340,7 +341,10 @@ def run_forever(rfh, wfh, options, cf):
                                        # XXX this should move somewhere else:
                                        if cur_selection == '55':
                                                mk.set_message('OPENSESAME')
-                                               ret = os.system('su - "%s" -c "dispense door"'%username)
+                                               if geteuid() == 0:
+                                                       ret = os.system('su - "%s" -c "dispense door"'%username)
+                                               else:
+                                                       ret = os.system('dispense door')
                                                if ret == 0:
                                                        mk.set_message(center('DOOR OPEN'))
                                                else:
@@ -387,6 +391,9 @@ def parse_args():
        op.add_option('-v', '--virtualvend', action='store_false', default=True, dest='use_lat', help='use the virtual vending server instead of LAT')
        op.add_option('-n', '--hostname', dest='host', default='localhost', help='the hostname to connect to for virtual vending machine mode (default: localhost)')
        op.add_option('-p', '--port', dest='port', default=5150, type='int', help='the port number to connect to (default: 5150)')
+       op.add_option('-l', '--log-file', metavar='FILE', dest='log_file', default='', help='log output to the specified file')
+       op.add_option('-s', '--syslog', dest='syslog', action='store_true', default=False, help='log output to syslog')
+       op.add_option('-d', '--daemon', dest='daemon', action='store_true', default=False, help='run as a daemon')
        options, args = op.parse_args()
 
        if len(args) != 0:
@@ -423,12 +430,19 @@ class VendConfigFile:
                        print "Error reading config file "+config_file+": " + str(e)
                        sys.exit(1)
 
-
-if __name__ == '__main__':
-
+def do_vend_server():
        options = parse_args()
        config_opts = VendConfigFile(options.config_file, config_options)
 
+       if options.daemon:
+               dev_null = file('/dev/null')
+               fd = dev_null.fileno()
+               os.dup2(fd, 0)
+               os.dup2(fd, 1)
+               os.dup2(fd, 2)
+               if os.fork() != 0:
+                       sys.exit(0)
+
        while True:
                try:
                        rfh, wfh = connect_to_vend(options, config_opts)
@@ -446,3 +460,32 @@ if __name__ == '__main__':
                        print
                        print "Connection died, trying again..."
 
+if __name__ == '__main__':
+       def do_nothing(signum, stack): pass
+       def stop_server(signum, stack): raise KeyboardInterrupt
+       signal.signal(signal.SIGHUP, do_nothing)
+       signal.signal(signal.SIGTERM, stop_server)
+       signal.signal(signal.SIGINT, stop_server)
+       while True:
+               try:
+                       do_vend_server()
+               except KeyboardInterrupt:
+                       print "Killed by signal."
+                       break
+               except SystemExit, e:
+                       raise e
+               except:
+                       (exc_type, exc_value, exc_traceback) = sys.exc_info()
+                       print
+                       print "Uh-oh, unhandled " + str(exc_type) + " exception"
+                       print "Message: ", str(exc_value)
+                       print
+                       print_tb(exc_traceback)
+                       del exc_traceback
+                       print
+                       print "This message should be considered a bug in the Vend Server."
+                       print "Please report this to someone who can fix it."
+                       sleep(10)
+                       print
+                       print "Trying again anyway (might not help, but hey...)"
+