ctlmod.py

   1 # Erebus IRC bot - Author: John Runyon
   2 # module loading/unloading/tracking code
   3
   4 import sys, time
   5 import modlib
   6
   7 modules = {}
   8 dependents = {}
   9
  10 def isloaded(modname): return modname in modules
  11 def modhas(modname, attname): return getattr(modules[modname], attname, None) is not None
  12
  13 def load(parent, modname, dependent=False):
  14         #wrapper to call _load and print return
  15         if dependent:
  16                 print "Loading dependency %s..." % (modname),
  17         else:
  18                 print "%05.3f [MOD] [#] Loading %s... " % (time.time() % 100000, modname),
  19         modstatus = _load(parent, modname, dependent)
  20         if not modstatus:
  21                 print str(modstatus)
  22         elif modstatus == True:
  23                 if dependent:
  24                         print "OK. ",
  25                 else:
  26                         print "OK."
  27         else:
  28                 print modstatus
  29         return modstatus
  30
  31 def _load(parent, modname, dependent=False):
  32         if not isloaded(modname):
  33                 sys.path.insert(0, 'modules')
  34                 try:
  35                         mod = __import__(modname)
  36                         reload(mod) #in case it's been previously loaded.
  37                 except BaseException as e: #we don't want even sys.exit() to crash us (in case of malicious module) so use BaseException
  38                         return modlib.error(e)
  39                 finally:
  40                         del sys.path[0] #remove ./modules from path, in case there's a name conflict
  41
  42
  43                 if not hasattr(mod, 'modinfo'):
  44                         return modlib.error('no modinfo')
  45
  46                 if parent.APIVERSION not in mod.modinfo['compatible']:
  47                         return modlib.error('API-incompatible')
  48
  49                 modules[modname] = mod
  50                 dependents[modname] = []
  51
  52                 for dep in mod.modinfo['depends']:
  53                         if dep not in modules:
  54                                 depret = load(parent, dep, dependent=True)
  55                                 if not depret:
  56                                         return
  57                         dependents[dep].append(modname)
  58
  59
  60                 ret = mod.modstart(parent)
  61                 if ret is not None and not ret:
  62                         del modules[modname]
  63                         del dependents[modname]
  64                         for dep in mod.modinfo['depends']:
  65                                 dependents[dep].remove(modname)
  66                 return ret
  67         else: #if not isloaded...else:
  68                 return modlib.error('already loaded')
  69
  70 def unload(parent, modname):
  71         if isloaded(modname):
  72                 for dependent in dependents[modname]:
  73                         unload(parent, dependent)
  74                 for dep in dependents[modname]:
  75                         dependents[dep].remove(modname)
  76                 ret = modules[modname].modstop(parent)
  77                 del modules[modname]
  78                 return ret
  79         else:
  80                 return modlib.error('already unloaded')
  81
  82 def reloadmod(parent, modname):
  83         if isloaded(modname):
  84                 if modhas(modname, 'modrestart'): modules[modname].modrestart(parent)
  85                 else: modules[modname].modstop(parent)
  86
  87                 try:
  88                         reload(modules[modname])
  89                 except BaseException as e:
  90                         return modlib.error(e)
  91
  92                 if modhas(modname, 'modrestarted'): ret = modules[modname].modrestarted(parent)
  93                 else: ret = modules[modname].modstart(parent)
  94
  95                 return ret
  96         else:
  97                 return load(parent, modname)
  98
  99
 100 def loadall(parent, modlist):
 101         for m in modlist: load(parent, m)
 102 def unloadall(parent, modlist):
 103         for m in modlist: unload(parent, m)
 104 def reloadall(parent, modlist):
 105         for m in modlist: reloadmod(parent, m)
 106
 107 sys.path.append('modules')