1 # Copyright (c) 2019 AT&T Intellectual Property.
2 # Copyright (c) 2018-2019 Nokia.
4 # Licensed under the Apache License, Version 2.0 (the "License");
5 # you may not use this file except in compliance with the License.
6 # You may obtain a copy of the License at
8 # http://www.apache.org/licenses/LICENSE-2.0
10 # Unless required by applicable law or agreed to in writing, software
11 # distributed under the License is distributed on an "AS IS" BASIS,
12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 # See the License for the specific language governing permissions and
14 # limitations under the License.
17 # This source code is part of the near-RT RIC (RAN Intelligent Controller)
18 # platform project (RICP).
21 """The module provides implementation of the syncronous Shared Data Layer (SDL) interface."""
23 from typing import (Dict, Set, List, Union)
24 from ricsdl.configuration import _Configuration
25 from ricsdl.syncstorage_abc import (SyncStorageAbc, SyncLockAbc)
27 from ricsdl.backend.dbbackend_abc import DbBackendAbc
28 from ricsdl.exceptions import SdlTypeError
31 def func_arg_checker(exception, start_arg_idx, **types):
32 """Decorator to validate function arguments."""
37 def _validate(*args, **kwds):
38 for idx, arg in enumerate(args[start_arg_idx:], start_arg_idx):
39 if func.__code__.co_varnames[idx] in types and \
40 not isinstance(arg, types[func.__code__.co_varnames[idx]]):
41 raise exception(r"Wrong argument type: '{}'={}. Must be: {}".
42 format(func.__code__.co_varnames[idx], type(arg),
43 types[func.__code__.co_varnames[idx]]))
44 for kwdname, kwdval in kwds.items():
45 if kwdname in types and not isinstance(kwdval, types[kwdname]):
46 raise exception(r"Wrong argument type: '{}'={}. Must be: {}".
47 format(kwdname, type(kwdval), types[kwdname]))
48 return func(*args, **kwds)
49 _validate.__name__ = func.__name__
54 class SyncLock(SyncLockAbc):
56 This class implements Shared Data Layer (SDL) abstract 'SyncLockAbc' class.
58 A lock instance is created per namespace and it is identified by its `name` within a namespace.
61 ns (str): Namespace under which this lock is targeted.
62 name (str): Lock name, identifies the lock key in SDL storage.
63 expiration (int, float): Lock expiration time after which the lock is removed if it hasn't
64 been released earlier by a 'release' method.
65 storage (SyncStorage): Database backend object containing connection to a database.
67 @func_arg_checker(SdlTypeError, 1, ns=str, name=str, expiration=(int, float))
68 def __init__(self, ns: str, name: str, expiration: Union[int, float],
69 storage: 'SyncStorage') -> None:
71 super().__init__(ns, name, expiration)
72 self.__configuration = storage.get_configuration()
73 self.__dbbackendlock = ricsdl.backend.get_backend_lock_instance(self.__configuration,
75 storage.get_backend())
80 "namespace": self._ns,
82 "expiration": self._expiration,
83 "backend lock": str(self.__dbbackendlock)
87 @func_arg_checker(SdlTypeError, 1, retry_interval=(int, float),
88 retry_timeout=(int, float))
89 def acquire(self, retry_interval: Union[int, float] = 0.1,
90 retry_timeout: Union[int, float] = 10) -> bool:
91 return self.__dbbackendlock.acquire(retry_interval, retry_timeout)
93 def release(self) -> None:
94 self.__dbbackendlock.release()
96 def refresh(self) -> None:
97 self.__dbbackendlock.refresh()
99 def get_validity_time(self) -> Union[int, float]:
100 return self.__dbbackendlock.get_validity_time()
103 class SyncStorage(SyncStorageAbc):
105 This class implements Shared Data Layer (SDL) abstract 'SyncStorageAbc' class.
107 This class provides synchronous access to all the namespaces in SDL storage.
108 Data can be written, read and removed based on keys known to clients. Keys are unique within
109 a namespace, namespace identifier is passed as a parameter to all the operations.
112 fake_db_backend (str): Optional parameter. Parameter enables fake DB backend usage for an
113 SDL instance. Fake DB backend is ONLY allowed to use for testing
114 purposes at development phase of SDL clients when more advanced
115 database services are not necessarily needed. Currently value 'dict'
116 is only allowed value for the parameter, which enables dictionary
117 type of fake DB backend.
119 def __init__(self, fake_db_backend=None) -> None:
121 self.__configuration = _Configuration(fake_db_backend)
122 self.__dbbackend = ricsdl.backend.get_backend_instance(self.__configuration)
130 "configuration": str(self.__configuration),
131 "backend": str(self.__dbbackend)
136 self.__dbbackend.close()
138 @func_arg_checker(SdlTypeError, 1, ns=str, data_map=dict)
139 def set(self, ns: str, data_map: Dict[str, bytes]) -> None:
140 self.__dbbackend.set(ns, data_map)
142 @func_arg_checker(SdlTypeError, 1, ns=str, key=str, old_data=bytes, new_data=bytes)
143 def set_if(self, ns: str, key: str, old_data: bytes, new_data: bytes) -> bool:
144 return self.__dbbackend.set_if(ns, key, old_data, new_data)
146 @func_arg_checker(SdlTypeError, 1, ns=str, key=str, data=bytes)
147 def set_if_not_exists(self, ns: str, key: str, data: bytes) -> bool:
148 return self.__dbbackend.set_if_not_exists(ns, key, data)
150 @func_arg_checker(SdlTypeError, 1, ns=str, keys=(str, builtins.set))
151 def get(self, ns: str, keys: Union[str, Set[str]]) -> Dict[str, bytes]:
152 disordered = self.__dbbackend.get(ns, list(keys))
153 return {k: disordered[k] for k in sorted(disordered)}
155 @func_arg_checker(SdlTypeError, 1, ns=str, key_pattern=str)
156 def find_keys(self, ns: str, key_pattern: str) -> List[str]:
157 return self.__dbbackend.find_keys(ns, key_pattern)
159 @func_arg_checker(SdlTypeError, 1, ns=str, key_pattern=str)
160 def find_and_get(self, ns: str, key_pattern: str) -> Dict[str, bytes]:
161 disordered = self.__dbbackend.find_and_get(ns, key_pattern)
162 return {k: disordered[k] for k in sorted(disordered)}
164 @func_arg_checker(SdlTypeError, 1, ns=str, keys=(str, builtins.set))
165 def remove(self, ns: str, keys: Union[str, Set[str]]) -> None:
166 self.__dbbackend.remove(ns, list(keys))
168 @func_arg_checker(SdlTypeError, 1, ns=str, key=str, data=bytes)
169 def remove_if(self, ns: str, key: str, data: bytes) -> bool:
170 return self.__dbbackend.remove_if(ns, key, data)
172 @func_arg_checker(SdlTypeError, 1, ns=str)
173 def remove_all(self, ns: str) -> None:
174 keys = self.__dbbackend.find_keys(ns, '*')
176 self.__dbbackend.remove(ns, keys)
178 @func_arg_checker(SdlTypeError, 1, ns=str, group=str, members=(bytes, builtins.set))
179 def add_member(self, ns: str, group: str, members: Union[bytes, Set[bytes]]) -> None:
180 self.__dbbackend.add_member(ns, group, members)
182 @func_arg_checker(SdlTypeError, 1, ns=str, group=str, members=(bytes, builtins.set))
183 def remove_member(self, ns: str, group: str, members: Union[bytes, Set[bytes]]) -> None:
184 self.__dbbackend.remove_member(ns, group, members)
186 @func_arg_checker(SdlTypeError, 1, ns=str, group=str)
187 def remove_group(self, ns: str, group: str) -> None:
188 self.__dbbackend.remove_group(ns, group)
190 @func_arg_checker(SdlTypeError, 1, ns=str, group=str)
191 def get_members(self, ns: str, group: str) -> Set[bytes]:
192 return self.__dbbackend.get_members(ns, group)
194 @func_arg_checker(SdlTypeError, 1, ns=str, group=str, member=bytes)
195 def is_member(self, ns: str, group: str, member: bytes) -> bool:
196 return self.__dbbackend.is_member(ns, group, member)
198 @func_arg_checker(SdlTypeError, 1, ns=str, group=str)
199 def group_size(self, ns: str, group: str) -> int:
200 return self.__dbbackend.group_size(ns, group)
202 @func_arg_checker(SdlTypeError, 1, ns=str, resource=str, expiration=(int, float))
203 def get_lock_resource(self, ns: str, resource: str, expiration: Union[int, float]) -> SyncLock:
204 return SyncLock(ns, resource, expiration, self)
206 def get_backend(self) -> DbBackendAbc:
207 """Return backend instance."""
208 return self.__dbbackend
210 def get_configuration(self) -> _Configuration:
211 """Return configuration what was valid when the SDL instance was initiated."""
212 return self.__configuration