server.py

import copy
import time
import storage

clone = copy.deepcopy

class Server:
 ''' Server simulation '''
 def __init__(self, storage_name):
 self.storage = storage.Storage(storage_name)

 def post(self, obj):
 obj['ts'] = time.time()
 obj['deleted'] = False
 key = self.storage.create(obj)
 return self.storage.read(key=key)

 def get(self, key=None, timestamp=None):
 ''' return objects changed after timestamp or return object with the key. '''
 if timestamp is not None:
 objects = [ ]
 for obj in self.storage.read_all():
 if obj['ts'] > timestamp:
 objects.append(obj)
 return objects
 if key is not None:
 return self.storage.read(key=key)
 return self.storage.read_all()

 def put(self, key, obj):
 old_obj = self.storage.read(key=key)
 obj['ts'] = time.time()
 obj['deleted'] = old_obj['deleted']
 self.storage.update(key, obj)
 return self.storage.read(key=key)

 def delete(self, key):
 obj = self.storage.read(key=key)
 obj['ts'] = time.time()
 obj['deleted'] = True
 self.storage.update(key, obj)