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 1 not in mod.modinfo['compatible']:
  19                         return modlib.error('API-incompatible')
  20
  21                 modules[modname] = mod
  22                 dependents[modname] = []
  23
  24                 for dep in mod.modinfo['depends']:
  25                         if dep not in modules:
  26                                 depret = load(parent, dep)
  27                                 if not depret:
  28                                         return
  29                         dependents[dep].append(modname)
  30
  31
  32                 ret = mod.modstart(parent)
  33                 if ret is not None and not ret:
  34                         del modules[modname]
  35                         del dependents[modname]
  36                         for dep in mod.modinfo['depends']:
  37                                 dependents[dep].remove(modname)
  38                 return ret
  39         else: #if not isloaded...else:
  40                 return modlib.error('already loaded')
  41
  42 def unload(parent, modname):
  43         if isloaded(modname):
  44                 for dependent in dependents[modname]:
  45                         unload(parent, dependent)
  46                 for dep in dependents[modname]:
  47                         dependents[dep].remove(modname)
  48                 return modules[modname].modstop(parent)
  49         else:
  50                 return modlib.error('already unloaded')
  51
  52 def reloadmod(parent, modname):
  53         if isloaded(modname):
  54                 if modhas(modname, 'modrestart'): modules[modname].modrestart(parent)
  55                 else: modules[modname].modstop(parent)
  56
  57                 reload(modules[modname])
  58
  59                 if modhas(modname, 'modrestarted'): modules[modname].modrestarted(parent)
  60                 else: modules[modname].modstart(parent)
  61
  62         else:
  63                 load(parent, modname)
  64
  65 def loadall(parent, modlist):
  66         for m in modlist: load(parent, m)
  67 def unloadall(parent, modlist):
  68         for m in modlist: unload(parent, m)
  69 def reloadall(parent, modlist):
  70         for m in modlist: reloadmod(parent, m)
  71
  72 sys.path.append('modules')