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 #dependents[modname] = [list of modules which depend on modname]
  10
  11 def isloaded(modname): return modname in modules
  12 def modhas(modname, attname): return getattr(modules[modname], attname, None) is not None
  13
  14 def load(parent, modname, dependent=False):
  15         #wrapper to call _load and print return
  16         if dependent:
  17                 print "(Loading dependency %s..." % (modname),
  18         else:
  19                 print "%09.3f [MOD] [?] Loading %s..." % (time.time() % 100000, modname),
  20         modstatus = _load(parent, modname, dependent)
  21         if not modstatus:
  22                 print str(modstatus)
  23         elif modstatus == True:
  24                 if dependent:
  25                         print "OK)",
  26                 else:
  27                         print "OK."
  28         else:
  29                 print modstatus
  30         return modstatus
  31
  32 def _load(parent, modname, dependent=False):
  33         if not isloaded(modname):
  34                 try:
  35                         mod = __import__('modules.'+modname, globals(), locals(), ['*'], -1)
  36                         # ^ fromlist doesn't actually do anything(?) but it means we don't have to worry about this returning the top-level "modules" object
  37                         reload(mod) #in case it's been previously loaded.
  38                 except Exception as e:
  39                         return modlib.error(e)
  40
  41
  42                 if not hasattr(mod, 'modinfo'):
  43                         return modlib.error('no modinfo')
  44
  45                 if parent.APIVERSION not in mod.modinfo['compatible']:
  46                         return modlib.error('API-incompatible')
  47
  48                 modules[modname] = mod
  49                 dependents[modname] = []
  50
  51                 for dep in mod.modinfo['depends']:
  52                         if dep not in modules:
  53                                 depret = load(parent, dep, dependent=True)
  54                                 if depret is not None and not depret:
  55                                         return depret #TODO FIXME
  56                         dependents[dep].append(modname)
  57
  58
  59                 ret = mod.modstart(parent)
  60                 if ret is not None and not ret:
  61                         del modules[modname]
  62                         del dependents[modname]
  63                         for dep in mod.modinfo['depends']:
  64                                 dependents[dep].remove(modname)
  65                 return ret
  66         else: #if not isloaded...else:
  67                 return modlib.error('already loaded')
  68
  69 def unload(parent, modname):
  70         if isloaded(modname):
  71                 for dependent in dependents[modname]:
  72                         unload(parent, dependent)
  73                 for dep in modules[modname].modinfo['depends']:
  74                         dependents[dep].remove(modname)
  75                 ret = modules[modname].modstop(parent)
  76                 del modules[modname]
  77                 return ret
  78         else:
  79                 return modlib.error('already unloaded')
  80
  81 def reloadmod(parent, modname):
  82         if isloaded(modname):
  83                 if modhas(modname, 'modrestart'): modules[modname].modrestart(parent)
  84                 else: modules[modname].modstop(parent)
  85
  86                 try:
  87                         reload(modules[modname])
  88                 except BaseException as e:
  89                         return modlib.error(e)
  90
  91                 if modhas(modname, 'modrestarted'): ret = modules[modname].modrestarted(parent)
  92                 else: ret = modules[modname].modstart(parent)
  93
  94                 return ret
  95         else:
  96                 return load(parent, modname)
  97
  98
  99 def loadall(parent, modlist):
 100         for m in modlist: load(parent, m)
 101 def unloadall(parent, modlist):
 102         for m in modlist: unload(parent, m)
 103 def reloadall(parent, modlist):
 104         for m in modlist: reloadmod(parent, m)