ctlmod.py

   1 # Erebus IRC bot - Author: John Runyon
   2 # module loading/unloading/tracking code
   3
   4 import sys
   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):
  14         if not isloaded(modname):
  15                 mod = __import__(modname)
  16                 reload(mod)
  17
  18                 if not hasattr(mod, 'modinfo'):
  19                         return modlib.error('no modinfo')
  20
  21                 if parent.APIVERSION not in mod.modinfo['compatible']:
  22                         return modlib.error('API-incompatible')
  23
  24                 modules[modname] = mod
  25                 dependents[modname] = []
  26
  27                 for dep in mod.modinfo['depends']:
  28                         if dep not in modules:
  29                                 depret = load(parent, dep)
  30                                 if not depret:
  31                                         return
  32                         dependents[dep].append(modname)
  33
  34
  35                 ret = mod.modstart(parent)
  36                 if ret is not None and not ret:
  37                         del modules[modname]
  38                         del dependents[modname]
  39                         for dep in mod.modinfo['depends']:
  40                                 dependents[dep].remove(modname)
  41                 return ret
  42         else: #if not isloaded...else:
  43                 return modlib.error('already loaded')
  44
  45 def unload(parent, modname):
  46         if isloaded(modname):
  47                 for dependent in dependents[modname]:
  48                         unload(parent, dependent)
  49                 for dep in dependents[modname]:
  50                         dependents[dep].remove(modname)
  51                 ret = modules[modname].modstop(parent)
  52                 del modules[modname]
  53                 return ret
  54         else:
  55                 return modlib.error('already unloaded')
  56
  57 def reloadmod(parent, modname):
  58         if isloaded(modname):
  59                 if modhas(modname, 'modrestart'): modules[modname].modrestart(parent)
  60                 else: modules[modname].modstop(parent)
  61
  62                 try:
  63                         return reload(modules[modname])
  64                 except BaseException, e:
  65                         return modlib.error(e)
  66
  67                 if modhas(modname, 'modrestarted'): modules[modname].modrestarted(parent)
  68                 else: modules[modname].modstart(parent)
  69
  70         else:
  71                 return load(parent, modname)
  72
  73
  74 def loadall(parent, modlist):
  75         for m in modlist: load(parent, m)
  76 def unloadall(parent, modlist):
  77         for m in modlist: unload(parent, m)
  78 def reloadall(parent, modlist):
  79         for m in modlist: reloadmod(parent, m)
  80
  81 sys.path.append('modules')