ordigi/elodie/localstorage.py

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import hashlib
import json
import os
from elodie import constants
class Db(object):
def __init__(self):
# verify that the application directory (~/.elodie) exists, else create it
if not os.path.exists(constants.application_directory):
os.makedirs(constants.application_directory)
# If the hash db doesn't exist we create it.
# Otherwise we only open for reading
if not os.path.isfile(constants.hash_db):
with open(constants.hash_db, 'a'):
os.utime(constants.hash_db, None)
self.hash_db = {}
# We know from above that this file exists so we open it for reading only.
with open(constants.hash_db, 'r') as f:
try:
self.hash_db = json.load(f)
except ValueError:
pass
def add_hash(self, key, value, write=False):
self.hash_db[key] = value
if(write == True):
self.update_hash_db()
def check_hash(self, key):
return key in self.hash_db
def get_hash(self, key):
if(self.check_hash(key) == True):
return self.hash_db[key]
return None
def update_hash_db(self):
with open(constants.hash_db, 'w') as f:
json.dump(self.hash_db, f)
"""
http://stackoverflow.com/a/3431835/1318758
"""
def checksum(self, file_path, blocksize=65536):
hasher = hashlib.sha256()
with open(file_path, 'r') as f:
buf = f.read(blocksize)
while len(buf) > 0:
hasher.update(buf)
buf = f.read(blocksize)
return hasher.hexdigest()
return None