do even more logging
[zanchey/dispense2.git] / sql-edition / servers / VendServer.py
index 7021622..a09ac2a 100755 (executable)
@@ -3,15 +3,20 @@
 
 USE_DB = 0
 
-import sys, os, string, re, pwd
+import ConfigParser
+import sys, os, string, re, pwd, signal
+import logging, logging.handlers
+from traceback import format_tb
 if USE_DB: import pg
 from time import time, sleep
 from popen2 import popen2
-from LATClient import LATClient
-from VendingMachine import VendingMachine
-from ConfigParser import ConfigParser
+from LATClient import LATClient, LATClientException
+from VendingMachine import VendingMachine, VendingException
 from HorizScroll import HorizScroll
 from random import random, seed
+from Idler import TrainIdler,GrayIdler
+import socket
+from posix import geteuid
 
 GREETING = 'UCC SNACKS'
 PIN_LENGTH = 4
@@ -20,6 +25,8 @@ DOOR = 1
 SWITCH = 2
 KEY = 3
 
+class DispenseDatabaseException(Exception): pass
+
 class DispenseDatabase:
        def __init__(self, vending_machine, host, name, user, password):
                self.vending_machine = vending_machine
@@ -27,16 +34,15 @@ class DispenseDatabase:
                self.db.query('LISTEN vend_requests')
 
        def process_requests(self):
-               print 'processing'
+               logging.debug('database processing')
                query = 'SELECT request_id, request_slot FROM vend_requests WHERE request_handled = false'
                try:
                        outstanding = self.db.query(query).getresult()
                except (pg.error,), db_err:
-                       sys.stderr.write('Failed to query database: %s\n'%(db_err.strip()))
-                       return
+                       raise DispenseDatabaseException('Failed to query database: %s\n'%(db_err.strip()))
                for (id, slot) in outstanding:
                        (worked, code, string) = self.vending_machine.vend(slot)
-                       print (worked, code, string)
+                       logging.debug (str((worked, code, string)))
                        if worked:
                                query = 'SELECT vend_success(%s)'%id
                                self.db.query(query).getresult()
@@ -109,8 +115,8 @@ def verify_user_pin(uid, pin):
        else:
                return None
 
-def door_open_mode(vending_machine):
-       print "Entering open door mode"
+def door_open_mode(v):
+       logging.warning("Entering open door mode")
        v.display("-FEED  ME-")
        while True:
                e = v.next_event()
@@ -118,69 +124,11 @@ def door_open_mode(vending_machine):
                (event, params) = e
                if event == DOOR:
                        if params == 1: # door closed
+                               logging.warning('Leaving open door mode')
                                v.display("-YUM YUM!-")
                                sleep(1)
                                return
 
-class Idler:
-       def __init__(self, v):
-               self.idle_state = 0
-               self.v = v
-
-       def put_shark(self, s, l):
-               if self.s[l] == ' ':
-                       self.s[l] = s
-               elif self.s[l] == 'X':
-                       self.s[l] = '*'
-               else:
-                       self.s[l] = 'X'
-
-       def next(self):
-               # does the next stage of a dance
-               self.s = [' ']*10
-               shark1 = self.idle_state % 18
-               if shark1 < 9:
-                       self.put_shark('^', shark1)
-               else:
-                       self.put_shark('^', 18-shark1)
-
-               shark2 = ((self.idle_state+4) % 36)/2
-               if shark2 < 9:
-                       self.put_shark('<', shark2)
-               else:
-                       self.put_shark('<', 18-shark2)
-
-               shark3 = ((self.idle_state+7) % 54)/3
-               if shark3 < 9:
-                       self.put_shark('>', 9-shark3)
-               else:
-                       self.put_shark('>', 9-(18-shark3))
-
-               train1 = ((self.idle_state%(18*36)))
-               train1_start = 122
-               if train1 > train1_start and train1 < train1_start+(10*2):
-                       for i in range(5):
-                               ptr = i+train1-train1_start-5
-                               if ptr >= 0 and ptr < 10: self.s[ptr] = '#'
-
-               train2 = ((self.idle_state%(18*36)))
-               train2_start = 400
-               if train2 > train2_start and train2 < train2_start+(10*2):
-                       for i in range(5):
-                               ptr = i+train2-train2_start-5
-                               if ptr >= 0 and ptr < 10: self.s[9-ptr] = '#'
-
-               train3 = ((self.idle_state%(18*36)))
-               train3_start = 230
-               if train3 > train3_start and train3 < train3_start+(10*2):
-                       for i in range(10):
-                               ptr = i+train3-train3_start-10
-                               if ptr >= 0 and ptr < 10: self.s[ptr] = '-'
-
-               self.v.display(string.join(self.s, ''))
-               self.idle_state += 1
-               self.idle_state %= 18*36*54
-
 def cookie(v):
        seed(time())
        messages = ['  WASSUP! ', 'PINK FISH ', ' SECRETS ', '  ESKIMO  ', ' FORTUNES ', 'MORE MONEY']
@@ -254,31 +202,11 @@ class MessageKeeper:
        def done(self):
                return len(self.scrolling_message) == 0
 
-if __name__ == '__main__':
-       cp = ConfigParser()
-       cp.read('/etc/dispense/servers.conf')
-       DBServer = cp.get('Database', 'Server')
-       DBName = cp.get('Database', 'Name')
-       DBUser = cp.get('VendingMachine', 'DBUser')
-       DBPassword = cp.get('VendingMachine', 'DBPassword')
-
-       ServiceName = cp.get('VendingMachine', 'ServiceName')
-       ServicePassword = cp.get('VendingMachine', 'Password')
-       # Open vending machine via LAT
-       if 0:
-               latclient = LATClient(service = ServiceName, password = ServicePassword)
-               (rfh, wfh) = latclient.get_fh()
-       else:
-               #(rfh, wfh) = popen2('../../virtualvend/vvend.py')
-               import socket
-               sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
-               sock.connect(('localhost', 5150))
-               rfh = sock.makefile('r')
-               wfh = sock.makefile('w')
+def run_forever(rfh, wfh, options, cf):
        v = VendingMachine(rfh, wfh)
-       print 'PING is', v.ping()
+       logging.debug('PING is', v.ping())
 
-       if USE_DB: db = DispenseDatabase(v, DBServer, DBName, DBUser, DBPassword)
+       if USE_DB: db = DispenseDatabase(v, cf.DBServer, cf.DBName, cf.DBUser, cf.DBPassword)
        cur_user = ''
        cur_pin = ''
        cur_selection = ''
@@ -286,12 +214,18 @@ if __name__ == '__main__':
        mk = MessageKeeper(v)
        mk.set_message(GREETING)
        time_to_autologout = None
-       idler = Idler(v)
+       #idler = TrainIdler(v)
+       #idler = GrayIdler(v)
+       idler = GrayIdler(v,one="*",zero="-")
        time_to_idle = None
        last_timeout_refresh = None
 
        while True:
-               if USE_DB: db.handle_events()
+               if USE_DB:
+                       try:
+                               db.handle_events()
+                       except DispenseDatabaseException, e:
+                               logging.error('Database error: '+str(e))
 
                if time_to_autologout != None:
                        time_left = time_to_autologout - time()
@@ -326,7 +260,7 @@ if __name__ == '__main__':
                                continue
                time_to_idle = None
                (event, params) = e
-               print e
+               logging.debug('Got event: ' + repr(e))
                if event == DOOR:
                        if params == 0:
                                door_open_mode(v);
@@ -414,7 +348,10 @@ if __name__ == '__main__':
                                        # 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:
@@ -437,3 +374,184 @@ if __name__ == '__main__':
                                        sleep(0.5)
                                        cur_selection = ''
                                        time_to_autologout = time() + 8
+
+def connect_to_vend(options, cf):
+       # Open vending machine via LAT?
+       if options.use_lat:
+               latclient = LATClient(service = cf.ServiceName, password = cf.ServicePassword, server_name = cf.ServerName, connect_password = cf.ConnectPassword, priv_password = cf.PrivPassword)
+               rfh, wfh = latclient.get_fh()
+       else:
+               #(rfh, wfh) = popen2('../../virtualvend/vvend.py')
+               import socket
+               sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
+               sock.connect((options.host, options.port))
+               rfh = sock.makefile('r')
+               wfh = sock.makefile('w')
+               
+       return rfh, wfh
+
+def parse_args():
+       from optparse import OptionParser
+
+       op = OptionParser(usage="%prog [OPTION]...")
+       op.add_option('-f', '--config-file', default='/etc/dispense/servers.conf', metavar='FILE', dest='config_file', help='use the specified config file instead of /etc/dispense/servers.conf')
+       op.add_option('--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')
+       op.add_option('-v', '--verbose', dest='verbose', action='store_true', default=False, help='spit out lots of debug output')
+       op.add_option('-q', '--quiet', dest='quiet', action='store_true', default=False, help='only report errors')
+       op.add_option('--pid-file', dest='pid_file', metavar='FILE', default='', help='store daemon\'s pid in the given file')
+       options, args = op.parse_args()
+
+       if len(args) != 0:
+               op.error('extra command line arguments: ' + ' '.join(args))
+
+       return options
+
+config_options = {
+       'DBServer': ('Database', 'Server'),
+       'DBName': ('Database', 'Name'),
+       'DBUser': ('VendingMachine', 'DBUser'),
+       'DBPassword': ('VendingMachine', 'DBPassword'),
+       
+       'ServiceName': ('VendingMachine', 'ServiceName'),
+       'ServicePassword': ('VendingMachine', 'Password'),
+       
+       'ServerName': ('DecServer', 'Name'),
+       'ConnectPassword': ('DecServer', 'ConnectPassword'),
+       'PrivPassword': ('DecServer', 'PrivPassword'),
+       }
+
+class VendConfigFile:
+       def __init__(self, config_file, options):
+               try:
+                       cp = ConfigParser.ConfigParser()
+                       cp.read(config_file)
+
+                       for option in options:
+                               section, name = options[option]
+                               value = cp.get(section, name)
+                               self.__dict__[option] = value
+               
+               except ConfigParser.Error, e:
+                       logging.critical("Error reading config file "+config_file+": " + str(e))
+                       logging.critical("Bailing out")
+                       sys.exit(1)
+
+def create_pid_file(name):
+       try:
+               pid_file = file(name, 'w')
+               pid_file.write('%d\n'%os.getpid())
+               pid_file.close()
+       except IOError, e:
+               logging.warning('unable to write to pid file '+name+': '+str(e))
+
+def set_stuff_up():
+       def do_nothing(signum, stack):
+               signal.signal(signum, do_nothing)
+       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)
+
+       options = parse_args()
+       set_up_logging(options)
+       config_opts = VendConfigFile(options.config_file, config_options)
+       if options.daemon: become_daemon()
+       if options.pid_file != '': create_pid_file(options.pid_file)
+
+       return options, config_opts
+
+def clean_up_nicely(options, config_opts):
+       if options.pid_file != '':
+               try:
+                       os.unlink(options.pid_file)
+                       logging.debug('Removed pid file '+options.pid_file)
+               except OSError: pass  # if we can't delete it, meh
+
+def set_up_logging(options):
+       logger = logging.getLogger()
+       
+       stderr_logger = logging.StreamHandler(sys.stderr)
+       stderr_logger.setFormatter(logging.Formatter('%(levelname)s: %(message)s'))
+       logger.addHandler(stderr_logger)
+       
+       if options.log_file != '':
+               try:
+                       file_logger = logging.FileHandler(options.log_file)
+                       file_logger.setFormatter(logging.Formatter('%(asctime)s %(levelname)s: %(message)s'))
+                       logger.addHandler(file_logger)
+               except IOError, e:
+                       logger.warning('unable to write to log file '+options.log_file+': '+str(e))
+
+       if options.syslog:
+               sys_logger = logging.handlers.SysLogHandler('/dev/log', 'daemon')
+               sys_logger.setFormatter(logging.Formatter('vendserver[%d]'%(os.getpid()) + ' %(levelname)s: %(message)s'))
+               logger.addHandler(sys_logger)
+
+       if options.quiet:
+               logger.setLevel(logging.WARNING)
+       elif options.verbose:
+               logger.setLevel(logging.DEBUG)
+       else:
+               logger.setLevel(logging.INFO)
+
+def become_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)
+
+def do_vend_server(options, config_opts):
+       while True:
+               try:
+                       rfh, wfh = connect_to_vend(options, config_opts)
+               except (LATClientException, socket.error), e:
+                       (exc_type, exc_value, exc_traceback) = sys.exc_info()
+                       del exc_traceback
+                       logging.error("Connection error: "+str(exc_type)+" "+str(e))
+                       logging.info("Trying again in 5 seconds.")
+                       sleep(5)
+                       continue
+               
+               try:
+                       run_forever(rfh, wfh, options, config_opts)
+               except VendingException:
+                       logging.error("Connection died, trying again...")
+                       logging.info("Trying again in 5 seconds.")
+                       sleep(5)
+
+if __name__ == '__main__':
+       options, config_opts = set_stuff_up()
+       while True:
+               try:
+                       logging.info('Starting Vend Server')
+                       do_vend_server(options, config_opts)
+                       logging.warning('Vend Server finished unexpectedly, restarting')
+               except KeyboardInterrupt:
+                       logging.info("Killed by signal, cleaning up")
+                       clean_up_nicely(options, config_opts)
+                       logging.info("Vend Server stopped")
+                       break
+               except:
+                       (exc_type, exc_value, exc_traceback) = sys.exc_info()
+                       tb = format_tb(exc_traceback, 20)
+                       del exc_traceback
+                       
+                       logging.critical("Uh-oh, unhandled " + str(exc_type) + " exception")
+                       logging.critical("Message: " + str(exc_value))
+                       logging.critical("Traceback:")
+                       for event in tb:
+                               for line in event.split('\n'):
+                                       logging.critical('    '+line)
+                       logging.critical("This message should be considered a bug in the Vend Server.")
+                       logging.critical("Please report this to someone who can fix it.")
+                       sleep(10)
+                       logging.warning("Trying again anyway (might not help, but hey...)")
+

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