85 lines
1.8 KiB
Python
85 lines
1.8 KiB
Python
# standard imports
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import os
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import logging
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# external imports
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from leveldir.hex import HexDir
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# local imports
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from chainqueue.error import DuplicateTxError
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logg = logging.getLogger(__name__)
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class IndexStore(HexDir):
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def __init__(self, root_path, digest_bytes=32):
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os.path.join(root_path, 'contents')
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self.store = HexDir(root_path, digest_bytes)
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def __exists(self, k):
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existing = None
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try:
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existing = self.get(k)
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except FileNotFoundError:
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pass
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return existing != None
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def put(self, k, v):
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kb = bytes.fromhex(k)
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vb = v.encode('utf-8')
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if self.__exists(k):
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raise DuplicateTxError(k)
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self.store.add(kb, vb)
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def get(self, k):
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fp = self.store.to_filepath(k)
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f = open(fp, 'rb')
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v = f.read()
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f.close()
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return v.decode('utf-8')
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class CounterStore:
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def __init__(self, root_path):
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try:
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os.stat(root_path)
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except FileNotFoundError:
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os.makedirs(root_path)
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fp = os.path.join(root_path, '.counter')
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f = None
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try:
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f = open(fp, 'rb+')
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except FileNotFoundError:
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logg.debug('counter not found, creating new in {}'.format(fp))
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f = open(fp, 'wb+')
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f.write(b'\x00' * 8)
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f.close()
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f = open(fp, 'rb+')
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v = f.read(8)
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self.count = int.from_bytes(v, byteorder='big')
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logg.info('counter starts at {}'.format(self.count))
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f.seek(0)
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self.f = f
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def __del__(self):
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self.f.close()
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def next(self):
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c = self.count
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self.count += 1
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v = self.count.to_bytes(8, 'big')
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self.f.write(v)
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self.f.seek(0)
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return c
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