#!/usr/bin/env python
# -*- coding:utf-8 -*-from aioredis import create_redis_pool
import datetime
import time as mod_time
from redis.exceptions import (
ConnectionError,
DataError,
ExecAbortError,
NoScriptError,
PubSubError,
RedisError,
ResponseError,
TimeoutError,
WatchError,
)
_NOTSET = 'UTF-8'
try:
from sanic.log import logger
except ImportError:
from sanic.log import log as logger
__version__ = '0.1.0'
class BaseRedis:
__coll__ = None # KeyGroup name
__dbkey__ = None # which database connected to?
__unique_fields__ = []
__motor_redis_client__ = None
__motor_redis_db__ = None
__motor_redis_clients__ = {}
__motor_redis_dbs__ = {}
__app__ = None
__apps__ = {}
__timezone__ = None
def __init__(self, *args, **kwargs):
self.__dict__.update(kwargs)
@classmethod
async def Execute(cls, command, *args, **kwargs):
kwargs['encoding'] = kwargs.pop('encoding', _NOTSET)
return await cls.__motor_redis_client__.execute(command, *args, **kwargs)
@staticmethod
def init_app(app, open_listener='before_server_start',
close_listener='before_server_stop', name=None, uri=None):
BaseRedis.__app__ = app
BaseRedis.__apps__[name or app.name] = app
if open_listener:
@app.listener(open_listener)
async def open_connection(app, loop):
await BaseRedis.default_open_connection(app, loop, name, uri)
if close_listener:
@app.listener(close_listener)
async def close_connection(app, loop):
await BaseRedis.default_close_connection(app, loop)
@staticmethod
async def default_open_connection(app, loop, name=None, *args, **kwargs):
if not name:
name = app.name
db = kwargs.pop('db', None)
logger.info('opening motor connection for redis [{}]'.format(name))
client = await create_redis_pool((app.config.redishost, app.config.redisport), db=db or app.config.redisdb,password=app.config.redispwd, loop=loop)
app.motor_redis_client = client
BaseRedis.__motor_redis_client__ = client
BaseRedis.__motor_redis_db__ = db
if not hasattr(app, 'motor_redis_clients'):
app.motor_redis_clients = {}
app.motor_redis_clients[name] = client
BaseRedis.__motor_redis_clients__[name] = client
BaseRedis.__motor_redis_dbs__[name] = db
@staticmethod
async def default_close_connection(app, loop):
if hasattr(app, 'motor_clients'):
for name, client in app.motor_redis_clients.items():
logger.info('closing motor redis connection for [{}]'.format(name))
client.close()
await client.wait_closed()
@classmethod
async def set_keys(cls,dict_obj=None,*args,**kwargs):
for key,item in dict_obj.items():
await cls.set(key,item)
return True
def __delitem__(self, key):
self.delete(key)
@classmethod
async def delete(cls,*keys):
keys = [cls.__coll__ + item for item in keys]
return await cls.Execute('DEL', *keys)
@classmethod
async def exists(cls, name):
"Returns a boolean indicating whether key ``name`` exists"
key = cls.__coll__ + name
return await cls.Execute('EXISTS', key)
__contains__ = exists
@classmethod
async def expire(cls, name, time):
"""
Set an expire flag on key ``name`` for ``time`` seconds. ``time``
can be represented by an integer or a Python timedelta object.
"""
name = cls.__coll__ + name
if isinstance(time, datetime.timedelta):
time = time.seconds + time.days * 24 * 3600
return await cls.Execute('EXPIRE', name, time)
@classmethod
async def expireat(cls, name, when):
"""
Set an expire flag on key ``name``. ``when`` can be represented
as an integer indicating unix time or a Python datetime object.
"""
name = cls.__coll__ + name
if isinstance(when, datetime.datetime):
when = int(mod_time.mktime(when.timetuple()))
return await cls.Execute('EXPIREAT', name, when)
@classmethod
async def keys(cls, pattern='*'):
"Returns a list of keys matching ``pattern``"
return await cls.Execute('KEYS', *pattern,encoding='utf-8')
# SERVER INFORMATION
@classmethod
async def bgrewriteaof(cls):
"Tell the Redis server to rewrite the AOF file from data in memory."
return cls.Execute('BGREWRITEAOF')
@classmethod
async def bgsave(cls):
"""
Tell the Redis server to save its data to disk. Unlike save(),
this method is asynchronous and returns immediately.
"""
return cls.Execute('BGSAVE')
@classmethod
async def client_kill(cls, address):
"Disconnects the client at ``address`` (ip:port)"
return cls.Execute('CLIENT KILL', address)
@classmethod
async def client_list(cls):
"Returns a list of currently connected clients"
return cls.Execute('CLIENT LIST')
@classmethod
async def client_getname(cls):
"Returns the current connection name"
return cls.Execute('CLIENT GETNAME')
@classmethod
async def client_setname(cls, name):
"Sets the current connection name"
return cls.Execute('CLIENT SETNAME', name)
@classmethod
async def config_get(cls, pattern="*"):
"Return a dictionary of configuration based on the ``pattern``"
return cls.Execute('CONFIG GET', *pattern,encoding='utf-8')
@classmethod
async def config_set(cls, name, value):
"Set config item ``name`` with ``value``"
return cls.Execute('CONFIG SET', name, value)
@classmethod
async def config_resetstat(self):
"Reset runtime statistics"
return self.Execute('CONFIG RESETSTAT')
@classmethod
async def config_rewrite(cls):
"Rewrite config file with the minimal change to reflect running config"
return await cls.Execute('CONFIG REWRITE')
@classmethod
async def dbsize(self):
"Returns the number of keys in the current database"
return self.Execute('DBSIZE')
@classmethod
async def debug_object(cls, key):
"Returns version specific meta information about a given key"
return await cls.Execute('DEBUG OBJECT', key)
@classmethod
async def echo(cls, value):
"Echo the string back from the server"
return await cls.Execute('ECHO', value)
@classmethod
async def flushall(cls):
"Delete all keys in all databases on the current host"
return await cls.Execute('FLUSHALL')
@classmethod
async def flushdb(cls):
"Delete all keys in the current database"
return await cls.Execute('FLUSHDB')
@classmethod
async def info(cls, section=None):
"""
Returns a dictionary containing information about the Redis server
The ``section`` option can be used to select a specific section
of information
The section option is not supported by older versions of Redis Server,
and will generate ResponseError
"""
if section is None:
return await cls.Execute('INFO')
else:
return await cls.Execute('INFO', section)
async def lastsave(self):
"""
Return a Python datetime object representing the last time the
Redis database was saved to disk
"""
return await self.Execute('LASTSAVE')
async def ping(self):
"Ping the Redis server"
return await self.Execute('PING')
async def save(self):
"""
Tell the Redis server to save its data to disk,
blocking until the save is complete
"""
return await self.Execute('SAVE')
async def time(self):
"""
Returns the server time as a 2-item tuple of ints:
(seconds since epoch, microseconds into this second).
"""
return await self.Execute('TIME')
# BASIC KEY COMMANDS
@classmethod
async def append(cls, key, value):
"""
Appends the string ``value`` to the value at ``key``. If ``key``
doesn't already exist, create it with a value of ``value``.
Returns the new length of the value at ``key``.
"""
return await cls.Execute('APPEND', key, value)
def bitcount(self, key, start=None, end=None):
"""
Returns the count of set bits in the value of ``key``. Optional
``start`` and ``end`` paramaters indicate which bytes to consider
"""
params = [key]
if start is not None and end is not None:
params.append(start)
params.append(end)
elif (start is not None and end is None) or \
(end is not None and start is None):
raise RedisError("Both start and end must be specified")
return self.Execute('BITCOUNT', *params)
def bitop(self, operation, dest, *keys):
"""
Perform a bitwise operation using ``operation`` between ``keys`` and
store the result in ``dest``.
"""
return self.Execute('BITOP', operation, dest, *keys)
@classmethod
async def bitpos(cls, key, bit, start=None, end=None):
"""
Return the position of the first bit set to 1 or 0 in a string.
``start`` and ``end`` difines search range. The range is interpreted
as a range of bytes and not a range of bits, so start=0 and end=2
means to look at the first three bytes.
"""
key = cls.__coll__ + key
if bit not in (0, 1):
raise RedisError('bit must be 0 or 1')
params = [key, bit]
start is not None and params.append(start)
if start is not None and end is not None:
params.append(end)
elif start is None and end is not None:
raise RedisError("start argument is not set, "
"when end is specified")
return await cls.Execute('BITPOS', *params)
@classmethod
async def decr(cls, name, amount=1):
"""
Decrements the value of ``key`` by ``amount``. If no key exists,
the value will be initialized as 0 - ``amount``
"""
name = cls.__coll__ + name
return await cls.Execute('DECRBY', name, amount)
@classmethod
async def dump(cls, name):
"""
Return a serialized version of the value stored at the specified key.
If key does not exist a nil bulk reply is returned.
"""
name = cls.__coll__ + name
return await cls.Execute('DUMP', name)
@classmethod
async def get(cls, name):
"""
Return the value at key ``name``, or None if the key doesn't exist
"""
name = cls.__coll__ + name
return await cls.Execute('GET', name)
def __getitem__(self, name):
"""
Return the value at key ``name``, raises a KeyError if the key
doesn't exist.
"""
value = self.get(name)
if value is not None:
return value
raise KeyError(name)
@classmethod
async def getbit(cls, name, offset):
"Returns a boolean indicating the value of ``offset`` in ``name``"
return await cls.Execute('GETBIT', name, offset)
@classmethod
async def getrange(cls, key, start, end):
"""
Returns the substring of the string value stored at ``key``,
determined by the offsets ``start`` and ``end`` (both are inclusive)
"""
return await cls.Execute('GETRANGE', key, start, end)
@classmethod
async def getset(cls, name, value):
"""
Sets the value at key ``name`` to ``value``
and returns the old value at key ``name`` atomically.
"""
return await cls.Execute('GETSET', name, value)
@classmethod
async def incr(cls, name, amount=1):
"""
Increments the value of ``key`` by ``amount``. If no key exists,
the value will be initialized as ``amount``
"""
return await cls.Execute('INCRBY', name, amount)
@classmethod
async def incrby(cls, name, amount=1):
"""
Increments the value of ``key`` by ``amount``. If no key exists,
the value will be initialized as ``amount``
"""
# An alias for ``incr()``, because it is already implemented
# as INCRBY redis command.
return await cls.incr(name, amount)
@classmethod
async def incrbyfloat(cls, name, amount=1.0):
"""
Increments the value at key ``name`` by floating ``amount``.
If no key exists, the value will be initialized as ``amount``
"""
return await cls.Execute('INCRBYFLOAT', name, amount)
@classmethod
async def rename(cls, src, dst):
"""
Rename key ``src`` to ``dst``
"""
return await cls.Execute('RENAME', src, dst)
@classmethod
async def renamenx(cls, src, dst):
"Rename key ``src`` to ``dst`` if ``dst`` doesn't already exist"
return await cls.Execute('RENAMENX', src, dst)
@classmethod
async def restore(cls, name, ttl, value, replace=False):
"""
Create a key using the provided serialized value, previously obtained
using DUMP.
"""
params = [name, ttl, value]
if replace:
params.append('REPLACE')
return await cls.Execute('RESTORE', *params)
@classmethod
async def set(cls, name, value, ex=None, px=None, nx=False, xx=False):
"""
Set the value at key ``name`` to ``value``
``ex`` sets an expire flag on key ``name`` for ``ex`` seconds.
``px`` sets an expire flag on key ``name`` for ``px`` milliseconds.
``nx`` if set to True, set the value at key ``name`` to ``value`` only
if it does not exist.
``xx`` if set to True, set the value at key ``name`` to ``value`` only
if it already exists.
"""
name = cls.__coll__ + name
pieces = [name, value]
if ex is not None:
pieces.append('EX')
if isinstance(ex, datetime.timedelta):
ex = ex.seconds + ex.days * 24 * 3600
pieces.append(ex)
if px is not None:
pieces.append('PX')
if isinstance(px, datetime.timedelta):
ms = int(px.microseconds / 1000)
px = (px.seconds + px.days * 24 * 3600) * 1000 + ms
pieces.append(px)
if nx:
pieces.append('NX')
if xx:
pieces.append('XX')
return await cls.Execute('SET', *pieces,encoding='utf-8')
def __setitem__(self, name, value):
self.set(name, value)
@classmethod
async def setbit(cls, name, offset, value):
"""
Flag the ``offset`` in ``name`` as ``value``. Returns a boolean
indicating the previous value of ``offset``.
"""
value = value and 1 or 0
return await cls.Execute('SETBIT', name, offset, value)
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