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tunldb.py
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tunldb.py
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import Queue
import time
import collections
import threading
import thread
import uuid
import copy
import itertools
import json
import os
TRANSACTION_METHODS = {
'set',
'increment',
'decrement',
'remove',
'rename',
'expire',
'set_add',
'set_remove',
'set_pop',
'list_lpush',
'list_rpush',
'list_lpop',
'list_rpop',
'list_remove',
'dict_set',
'dict_remove',
}
CHANNEL_TTL = 120
CHANNEL_BUFFER = 128
class TunlDB(object):
def __init__(self):
self._path = None
self._set_queue = Queue.Queue()
self._data = collections.defaultdict(
lambda: {'ttl': None, 'val': None})
self._timers = {}
self._channels = collections.defaultdict(
lambda: {'subs': set(), 'msgs': collections.deque(
maxlen=CHANNEL_BUFFER), 'timer': None})
self._commit_log = []
def _put_queue(self):
if self._path:
self._set_queue.put('set')
def _export_thread(self):
while True:
try:
self._set_queue.get(timeout=5)
except Queue.Empty:
continue
# Attempt to get more db sets form queue to reduce export calls
for _ in xrange(50):
try:
self._set_queue.get(timeout=0.01)
except Queue.Empty:
pass
self.export_data()
def _validate(self, value):
if value is not None and not isinstance(value, basestring):
raise TypeError('Value must be string')
def persist(self, path, auto_export=True):
if self._path:
raise ValueError('Persist is already set')
self._path = path
self.import_data()
if auto_export:
export_thread = threading.Thread(target=self._export_thread)
export_thread.daemon = True
export_thread.start()
def set(self, key, value):
self._validate(value)
self._data[key]['val'] = value
self._put_queue()
def get(self, key):
data = self._data.get(key)
if data:
return data['val']
def exists(self, key):
return key in self._data
def rename(self, key, new_key):
data = self._data.get(key)
if data:
self._data[new_key]['val'] = data['val']
self.remove(key)
self._put_queue()
def remove(self, key):
self._data.pop(key, None)
self._put_queue()
def expire(self, key, ttl):
ttl_time = int(time.time() * 1000) + int(ttl * 1000)
cur_timer = self._timers.pop(key, None)
if cur_timer:
cur_timer.cancel()
timer = threading.Timer(ttl, self.remove, (key,))
timer.daemon = True
self._timers[key] = timer
timer.start()
self._data[key]['ttl'] = ttl_time
self._put_queue()
def increment(self, key):
value = '1'
data = self._data.get(key)
if data:
try:
value = str(int(data['val']) + 1)
data['val'] = value
except (TypeError, ValueError):
data['val'] = value
else:
self._data[key]['val'] = value
self._put_queue()
return value
def decrement(self, key):
value = '-1'
data = self._data.get(key)
if data:
try:
value = str(int(data['val']) - 1)
data['val'] = value
except (TypeError, ValueError):
data['val'] = value
else:
self._data[key]['val'] = value
self._put_queue()
return value
def keys(self):
return set(self._data)
def set_add(self, key, element):
self._validate(element)
data = self._data.get(key)
if data:
try:
data['val'].add(element)
except AttributeError:
data['val'] = {element}
else:
self._data[key]['val'] = {element}
self._put_queue()
def set_remove(self, key, element):
data = self._data.get(key)
if data:
try:
data['val'].remove(element)
self._put_queue()
except (KeyError, AttributeError):
pass
def set_pop(self, key):
value = None
data = self._data.get(key)
if data:
try:
value = data['val'].pop()
self._put_queue()
except (KeyError, AttributeError):
pass
return value
def set_exists(self, key, element):
data = self._data.get(key)
if data:
try:
return element in data['val']
except (TypeError, AttributeError):
pass
return False
def set_elements(self, key):
data = self._data.get(key)
if data:
try:
return data['val'].copy()
except AttributeError:
pass
return set()
def set_iter(self, key):
data = self._data.get(key)
if data:
try:
for value in data['val'].copy():
yield value
except AttributeError:
pass
def set_length(self, key):
data = self._data.get(key)
if data:
try:
return len(data['val'])
except TypeError:
pass
return 0
def list_lpush(self, key, value):
self._validate(value)
data = self._data.get(key)
if data:
try:
data['val'].appendleft(value)
except AttributeError:
data['val'] = collections.deque([value])
else:
self._data[key]['val'] = collections.deque([value])
self._put_queue()
def list_rpush(self, key, value):
self._validate(value)
data = self._data.get(key)
if data:
try:
data['val'].append(value)
except AttributeError:
data['val'] = collections.deque([value])
else:
self._data[key]['val'] = collections.deque([value])
self._put_queue()
def list_lpop(self, key):
value = None
data = self._data.get(key)
if data:
try:
value = data['val'].popleft()
self._put_queue()
except (AttributeError, IndexError):
pass
return value
def list_rpop(self, key):
value = None
data = self._data.get(key)
if data:
try:
value = data['val'].pop()
self._put_queue()
except (AttributeError, IndexError):
pass
return value
def list_index(self, key, index):
data = self._data.get(key)
if data:
try:
return data['val'][index]
except (AttributeError, IndexError):
pass
def list_elements(self, key):
data = self._data.get(key)
if data:
try:
return list(data['val'])
except TypeError:
pass
return []
def list_iter(self, key):
data = self._data.get(key)
if data:
try:
for value in copy.copy(data['val']):
yield value
except TypeError:
pass
def list_iter_range(self, key, start, stop=None):
data = self._data.get(key)
if data:
try:
for value in itertools.islice(
copy.copy(data['val']), start, stop):
yield value
except TypeError:
pass
def list_remove(self, key, value, count=1):
self._validate(value)
data = self._data.get(key)
if data:
if count:
try:
[data['val'].remove(value) for _ in xrange(count)]
except (AttributeError, ValueError):
pass
else:
try:
while True:
data['val'].remove(value)
except (AttributeError, ValueError):
pass
self._put_queue()
def list_length(self, key):
data = self._data.get(key)
if data:
try:
return len(data['val'])
except TypeError:
pass
return 0
def dict_set(self, key, field, value):
self._validate(value)
data = self._data.get(key)
if data:
try:
data['val'][field] = value
except TypeError:
data['val'] = {field: value}
else:
self._data[key]['val'] = {field: value}
self._put_queue()
def dict_get(self, key, field):
data = self._data.get(key)
if data:
try:
return data['val'].get(field)
except TypeError:
pass
def dict_remove(self, key, field):
data = self._data.get(key)
if data:
try:
data['val'].pop(field, None)
except AttributeError:
pass
self._put_queue()
def dict_keys(self, key):
data = self._data.get(key)
if data:
try:
return set(data['val'])
except AttributeError:
pass
return set()
def dict_values(self, key):
data = self._data.get(key)
if data:
try:
return set(data['val'].values())
except AttributeError:
pass
return set()
def dict_iter(self, key):
data = self._data.get(key)
if data:
data_copy = data['val'].copy()
try:
for field in data_copy:
yield field, data_copy[field]
except (TypeError, AttributeError):
pass
def dict_get_all(self, key):
data = self._data.get(key)
if data:
try:
return data['val'].copy()
except AttributeError:
pass
return {}
def _clear_channel(self, channel):
if not self._channels[channel]['subs']:
self._channels.pop(channel, None)
else:
self._channels[channel]['timer'] = None
self._channels[channel]['msgs'] = collections.deque(
maxlen=CHANNEL_BUFFER)
def subscribe(self, channel, timeout=None):
event = threading.Event()
self._channels[channel]['subs'].add(event)
try:
try:
cursor = self._channels[channel]['msgs'][-1][0]
except IndexError:
cursor = None
while True:
if not cursor:
cursor_found = True
else:
cursor_found = False
if not event.wait(timeout):
break
event.clear()
messages = copy.copy(self._channels[channel]['msgs'])
for message in messages:
if cursor_found:
yield message[1]
elif message[0] == cursor:
cursor_found = True
if not cursor_found:
for message in messages:
yield message[1]
try:
cursor = messages[-1][0]
except IndexError:
cursor = None
finally:
try:
self._channels[channel]['subs'].remove(event)
except KeyError:
pass
def publish(self, channel, message):
cur_timer = self._channels[channel]['timer']
if cur_timer:
cur_timer.cancel()
timer = threading.Timer(CHANNEL_TTL, self._clear_channel, (channel,))
timer.daemon = True
self._channels[channel]['timer'] = timer
timer.start()
self._channels[channel]['msgs'].append((uuid.uuid4().hex, message))
for subscriber in self._channels[channel]['subs'].copy():
subscriber.set()
def transaction(self):
return TunlDBTransaction(self)
def _apply_trans(self, trans):
for call in trans[1]:
getattr(self, call[0])(*call[1], **call[2])
try:
self._commit_log.remove(trans)
except ValueError:
pass
self._put_queue()
def export_data(self):
if not self._path:
return
temp_path = self._path + '_%s.tmp' % uuid.uuid4().hex
try:
data = self._data.copy()
timers = self._timers.keys()
commit_log = copy.copy(self._commit_log)
with open(temp_path, 'w') as db_file:
os.chmod(temp_path, 0600)
export_data = []
for key in data:
key_ttl = data[key]['ttl']
key_val = data[key]['val']
key_type = type(key_val).__name__
if key_type == 'set' or key_type == 'deque':
key_val = list(key_val)
export_data.append((key, key_type, key_ttl, key_val))
db_file.write(json.dumps({
'ver': 1,
'data': export_data,
'timers': timers,
'commit_log': commit_log,
}))
os.rename(temp_path, self._path)
except:
try:
os.remove(temp_path)
except OSError:
pass
raise
def import_data(self):
if os.path.isfile(self._path):
with open(self._path, 'r') as db_file:
import_data = json.loads(db_file.read())
data = import_data['data']
for key_data in data:
key = key_data[0]
key_type = key_data[1]
key_ttl = key_data[2]
key_val = key_data[3]
if key_type == 'set':
key_val = set(key_val)
elif key_type == 'deque':
key_val = collections.deque(key_val)
self._data[key] = {
'ttl': key_ttl,
'val': key_val,
}
if 'timers' in import_data:
for key in import_data['timers']:
if key not in self._data:
continue
ttl = self._data[key]['ttl']
if not ttl:
continue
ttl -= int(time.time() * 1000)
ttl /= 1000.0
if ttl >= 0:
timer = threading.Timer(ttl, self.remove, (key,))
timer.daemon = True
self._timers[key] = timer
timer.start()
else:
self.remove(key)
if 'commit_log' in import_data:
for tran in import_data['commit_log']:
self._apply_trans(tran)
class TunlDBTransaction(object):
def __init__(self, tunldb):
self._tunldb = tunldb
self._trans = []
def __getattr__(self, name):
if name in TRANSACTION_METHODS:
def serialize(*args, **kwargs):
self._trans.append((name, args, kwargs))
return serialize
return getattr(self._tunldb, name)
def commit(self):
trans = (uuid.uuid4().hex, self._trans)
self._tunldb._commit_log.append(trans)
self._trans = []
self._tunldb._apply_trans(trans)