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# -*- coding: utf-8 -*-
"""
Stores metadata about images which are built to encorporate changes to subuser images which are required in order to implement various permissions.
"""
#external imports
import os
import json
from collections import OrderedDict
#internal imports
from subuserlib.classes.userOwnedObject import UserOwnedObject
from subuserlib.classes.fileBackedObject import FileBackedObject
class RuntimeCache(dict,UserOwnedObject,FileBackedObject):
def __init__(self,user,subuser):
self.subuser = subuser
UserOwnedObject.__init__(self,user)
self.load()
@property
def pathToCurrentImagesRuntimeCacheDir(self):
return os.path.join(self.user.config["runtime-cache"],self.subuser.imageId)
@property
def runtimeCacheFilePath(self):
return os.path.join(self.pathToCurrentImagesRuntimeCacheDir,self.subuser.getRunReadyImage().sourceHash+".json")
def save(self):
try:
self.user.endUser.makedirs(self.pathToCurrentImagesRuntimeCacheDir)
except OSError:
pass
with self.user.endUser.get_file(self.runtimeCacheFilePath,mode='w') as runtimeCacheFileHandle:
json.dump(self,runtimeCacheFileHandle,indent=1,separators=(',',': '))
def reload(self):
self.save()
self.load()
def load(self):
if not self.subuser.imageId:
raise NoRuntimeCacheForSubusersWhichDontHaveExistantImagesException("No runnable image for subuser "+self.subuser.name+" found. Use\n\n $ subuser repair\n\nTo repair your instalation.")
runtimeCacheFilePath = self.runtimeCacheFilePath
if os.path.exists(runtimeCacheFilePath):
with open(runtimeCacheFilePath,mode="r") as runtimeCacheFileHandle:
runtimeCacheInfo = json.load(runtimeCacheFileHandle, object_pairs_hook=OrderedDict)
self.update(runtimeCacheInfo)
class NoRuntimeCacheForSubusersWhichDontHaveExistantImagesException(Exception):
pass
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