79 lines
1.7 KiB
Python
79 lines
1.7 KiB
Python
# standard imports
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import os
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import hashlib
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mod_dir = os.path.dirname(os.path.realpath(__file__))
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root_dir = os.path.join(mod_dir, '..')
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data_dir = os.path.join(mod_dir, 'data')
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schema_dir = os.path.join(mod_dir, 'schema')
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class Data:
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"""Base class for all parts of the token data deployment.
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"""
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__default_version = 0
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def __init__(self):
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self.dirty = False
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self.inited = False
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self.__version = self.__default_version
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self.__hasher = self.__basehasher
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def __basehasher(self, v):
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h = hashlib.sha256()
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h.update(v)
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return h.digest()
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def hash(self, v):
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"""Compute digest of the given data
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:param v: Data to hash
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:type v: bytes
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:rtype: bytes
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:return: Hashed data
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"""
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return self.__hasher(v)
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def load(self):
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"""Prevents overwriting data from settings if data state has changed.
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:raises RuntimeError: If state is dirty
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"""
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if self.dirty:
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raise RuntimeError('Object contains uncommitted changes')
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def start(self):
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"""Prevents double initialization of data item.
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:raises RuntimeError: If already initialized
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"""
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if self.inited:
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raise RuntimeError('Object already initialized')
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def verify(self):
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"""Verify data state (noop)
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"""
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return True
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def version(self):
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"""Return version of data schema.
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"""
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return self.__version
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def set_version(self, version):
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"""Set version of data schema. The version number is a single integer.
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:param version: version
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:type version: int
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"""
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self.__version = version
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