class Node_Db_Context(object):
def __init__(self, node_info):
self.sync = RWLock()
self.db = "db/" + str(node_info.key) + ".db"
self.node_info = node_info
self.own_start = None
self.own_end = None
#self.back_thread = threading.Thread(target=lambda: self.backup_loop(self))
#self.back_thread.daemon = True
#self.back_thread.start()
def write(self, hash_name, content):
self.sync.writer_acquire()
try:
records = shelve.open(self.db)
records[hash_name] = content
records.close()
print str(self.node_info) + " write block: " + hash_name
finally:
self.sync.writer_release()
def read(self, hash_name):
content = None
self.sync.reader_acquire()
try:
records = shelve.open(self.db)
if not records.has_key(hash_name):
print str(self.node_info) + " read block: " + hash_name + " FAILED!!"
content = "404 Error"
else:
print str(self.node_info) + " read block: " + hash_name
content = records[hash_name] #this retrieved COPY OF CONTENT
records.close()
finally:
self.sync.reader_release()
return content
