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 "%09.3f [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                 try:
  34                         mod = __import__('modules.'+modname, globals(), locals(), ['*'], -1)
  35                         # ^ fromlist doesn't actually do anything(?) but it means we don't have to worry about this returning the top-level "modules" object
  36                         reload(mod) #in case it's been previously loaded.
  37                 except Exception as e:
  38                         return modlib.error(e)
  39
  40
  41                 if not hasattr(mod, 'modinfo'):
  42                         return modlib.error('no modinfo')
  43
  44                 if parent.APIVERSION not in mod.modinfo['compatible']:
  45                         return modlib.error('API-incompatible')
  46
  47                 modules[modname] = mod
  48                 dependents[modname] = []
  49
  50                 for dep in mod.modinfo['depends']:
  51                         if dep not in modules:
  52                                 depret = load(parent, dep, dependent=True)
  53                                 if not depret:
  54                                         return
  55                         dependents[dep].append(modname)
  56
  57
  58                 ret = mod.modstart(parent)
  59                 if ret is not None and not ret:
  60                         del modules[modname]
  61                         del dependents[modname]
  62                         for dep in mod.modinfo['depends']:
  63                                 dependents[dep].remove(modname)
  64                 return ret
  65         else: #if not isloaded...else:
  66                 return modlib.error('already loaded')
  67
  68 def unload(parent, modname):
  69         if isloaded(modname):
  70                 for dependent in dependents[modname]:
  71                         unload(parent, dependent)
  72                 for dep in dependents[modname]:
  73                         dependents[dep].remove(modname)
  74                 ret = modules[modname].modstop(parent)
  75                 del modules[modname]
  76                 return ret
  77         else:
  78                 return modlib.error('already unloaded')
  79
  80 def reloadmod(parent, modname):
  81         if isloaded(modname):
  82                 if modhas(modname, 'modrestart'): modules[modname].modrestart(parent)
  83                 else: modules[modname].modstop(parent)
  84
  85                 try:
  86                         reload(modules[modname])
  87                 except BaseException as e:
  88                         return modlib.error(e)
  89
  90                 if modhas(modname, 'modrestarted'): ret = modules[modname].modrestarted(parent)
  91                 else: ret = modules[modname].modstart(parent)
  92
  93                 return ret
  94         else:
  95                 return load(parent, modname)
  96
  97
  98 def loadall(parent, modlist):
  99         for m in modlist: load(parent, m)
 100 def unloadall(parent, modlist):
 101         for m in modlist: unload(parent, m)
 102 def reloadall(parent, modlist):
 103         for m in modlist: reloadmod(parent, m)