forked from mirror/ledisdb
674 lines
23 KiB
Python
674 lines
23 KiB
Python
from __future__ import with_statement
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import datetime
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import time as mod_time
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from ledis._compat import (b, izip, imap, iteritems, iterkeys, itervalues,
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basestring, long, nativestr, urlparse, bytes)
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from ledis.connection import ConnectionPool, UnixDomainSocketConnection
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from ledis.exceptions import (
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ConnectionError,
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DataError,
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LedisError,
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ResponseError,
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ExecAbortError,
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)
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SYM_EMPTY = b('')
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def list_or_args(keys, args):
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# returns a single list combining keys and args
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try:
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iter(keys)
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# a string or bytes instance can be iterated, but indicates
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# keys wasn't passed as a list
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if isinstance(keys, (basestring, bytes)):
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keys = [keys]
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except TypeError:
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keys = [keys]
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if args:
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keys.extend(args)
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return keys
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def string_keys_to_dict(key_string, callback):
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return dict.fromkeys(key_string.split(), callback)
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def dict_merge(*dicts):
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merged = {}
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[merged.update(d) for d in dicts]
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return merged
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def pairs_to_dict(response):
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"Create a dict given a list of key/value pairs"
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it = iter(response)
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return dict(izip(it, it))
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def zset_score_pairs(response, **options):
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"""
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If ``withscores`` is specified in the options, return the response as
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a list of (value, score) pairs
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"""
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if not response or not options['withscores']:
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return response
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score_cast_func = options.get('score_cast_func', int)
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it = iter(response)
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return list(izip(it, imap(score_cast_func, it)))
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def int_or_none(response):
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if response is None:
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return None
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return int(response)
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class Ledis(object):
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"""
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Implementation of the Redis protocol.
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This abstract class provides a Python interface to all LedisDB commands
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and an implementation of the Redis protocol.
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Connection and Pipeline derive from this, implementing how
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the commands are sent and received to the Ledis server
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"""
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RESPONSE_CALLBACKS = dict_merge(
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string_keys_to_dict(
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'EXISTS EXPIRE EXPIREAT HEXISTS HMSET SETNX '
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'PERSIST HPERSIST LPERSIST ZPERSIST',
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bool
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),
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string_keys_to_dict(
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'DECRBY DEL HDEL HLEN INCRBY LLEN '
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'ZADD ZCARD ZREM ZREMRANGEBYRANK ZREMRANGEBYSCORE'
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'LMCLEAR HMCLEAR ZMCLEAR',
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int
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),
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string_keys_to_dict(
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'LPUSH RPUSH',
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lambda r: isinstance(r, long) and r or nativestr(r) == 'OK'
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),
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string_keys_to_dict(
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'MSET SELECT ',
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lambda r: nativestr(r) == 'OK'
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),
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string_keys_to_dict(
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'ZRANGE ZRANGEBYSCORE ZREVRANGE ZREVRANGEBYSCORE',
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zset_score_pairs
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),
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string_keys_to_dict('ZRANK ZREVRANK ZSCORE ZINCRBY', int_or_none),
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{
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'HGETALL': lambda r: r and pairs_to_dict(r) or {},
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'PING': lambda r: nativestr(r) == 'PONG',
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'SET': lambda r: r and nativestr(r) == 'OK', }
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)
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@classmethod
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def from_url(cls, url, db=None, **kwargs):
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"""
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Return a Ledis client object configured from the given URL.
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For example::
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redis://[:password]@localhost:6380/0
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unix://[:password]@/path/to/socket.sock?db=0
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There are several ways to specify a database number. The parse function
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will return the first specified option:
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1. A ``db`` querystring option, e.g. redis://localhost?db=0
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2. If using the redis:// scheme, the path argument of the url, e.g.
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redis://localhost/0
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3. The ``db`` argument to this function.
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If none of these options are specified, db=0 is used.
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Any additional querystring arguments and keyword arguments will be
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passed along to the ConnectionPool class's initializer. In the case
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of conflicting arguments, querystring arguments always win.
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"""
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connection_pool = ConnectionPool.from_url(url, db=db, **kwargs)
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return cls(connection_pool=connection_pool)
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def __init__(self, host='localhost', port=6380,
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db=0, socket_timeout=None,
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connection_pool=None, charset='utf-8',
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errors='strict', decode_responses=False,
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unix_socket_path=None):
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if not connection_pool:
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kwargs = {
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'db': db,
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'socket_timeout': socket_timeout,
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'encoding': charset,
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'encoding_errors': errors,
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'decode_responses': decode_responses,
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}
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# based on input, setup appropriate connection args
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if unix_socket_path:
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kwargs.update({
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'path': unix_socket_path,
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'connection_class': UnixDomainSocketConnection
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})
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else:
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kwargs.update({
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'host': host,
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'port': port
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})
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connection_pool = ConnectionPool(**kwargs)
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self.connection_pool = connection_pool
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self.response_callbacks = self.__class__.RESPONSE_CALLBACKS.copy()
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def set_response_callback(self, command, callback):
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"Set a custom Response Callback"
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self.response_callbacks[command] = callback
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#### COMMAND EXECUTION AND PROTOCOL PARSING ####
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def execute_command(self, *args, **options):
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"Execute a command and return a parsed response"
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pool = self.connection_pool
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command_name = args[0]
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connection = pool.get_connection(command_name, **options)
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try:
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connection.send_command(*args)
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return self.parse_response(connection, command_name, **options)
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except ConnectionError:
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connection.disconnect()
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connection.send_command(*args)
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return self.parse_response(connection, command_name, **options)
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finally:
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pool.release(connection)
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def parse_response(self, connection, command_name, **options):
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"Parses a response from the Ledis server"
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response = connection.read_response()
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if command_name in self.response_callbacks:
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return self.response_callbacks[command_name](response, **options)
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return response
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#### SERVER INFORMATION ####
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def echo(self, value):
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"Echo the string back from the server"
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return self.execute_command('ECHO', value)
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def ping(self):
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"Ping the Ledis server"
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return self.execute_command('PING')
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def select(self, db):
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"""Select a Ledis db, ``db`` is integer type"""
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try:
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db = int(db)
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except ValueError:
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db = 0
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return self.execute_command('SELECT', db)
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#### BASIC KEY COMMANDS ####
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def decr(self, name, amount=1):
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"""
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Decrements the value of ``key`` by ``amount``. If no key exists,
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the value will be initialized as 0 - ``amount``
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"""
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return self.execute_command('DECRBY', name, amount)
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def decrby(self, name, amount=1):
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"""
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Decrements the value of ``key`` by ``amount``. If no key exists,
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the value will be initialized as 0 - ``amount``
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"""
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return self.decr(name, amount)
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def delete(self, *names):
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"Delete one or more keys specified by ``names``"
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return self.execute_command('DEL', *names)
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def exists(self, name):
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"Returns a boolean indicating whether key ``name`` exists"
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return self.execute_command('EXISTS', name)
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def expire(self, name, time):
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"""
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Set an expire flag on key ``name`` for ``time`` seconds. ``time``
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can be represented by an integer or a Python timedelta object.
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"""
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if isinstance(time, datetime.timedelta):
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time = time.seconds + time.days * 24 * 3600
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return self.execute_command('EXPIRE', name, time)
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def expireat(self, name, when):
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"""
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Set an expire flag on key ``name``. ``when`` can be represented
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as an integer indicating unix time or a Python datetime object.
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"""
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if isinstance(when, datetime.datetime):
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when = int(mod_time.mktime(when.timetuple()))
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return self.execute_command('EXPIREAT', name, when)
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def get(self, name):
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"""
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Return the value at key ``name``, or None if the key doesn't exist
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"""
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return self.execute_command('GET', name)
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def __getitem__(self, name):
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"""
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Return the value at key ``name``, raises a KeyError if the key
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doesn't exist.
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"""
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value = self.get(name)
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if value:
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return value
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raise KeyError(name)
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def getset(self, name, value):
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"""
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Set the value at key ``name`` to ``value`` if key doesn't exist
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Return the value at key ``name`` atomically
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"""
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return self.execute_command('GETSET', name, value)
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def incr(self, name, amount=1):
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"""
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Increments the value of ``key`` by ``amount``. If no key exists,
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the value will be initialized as ``amount``
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"""
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return self.execute_command('INCRBY', name, amount)
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def incrby(self, name, amount=1):
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"""
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Increments the value of ``key`` by ``amount``. If no key exists,
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the value will be initialized as ``amount``
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"""
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# An alias for ``incr()``, because it is already implemented
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# as INCRBY ledis command.
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return self.incr(name, amount)
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def mget(self, keys, *args):
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"""
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Returns a list of values ordered identically to ``keys``
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"""
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args = list_or_args(keys, args)
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return self.execute_command('MGET', *args)
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def mset(self, *args, **kwargs):
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"""
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Sets key/values based on a mapping. Mapping can be supplied as a single
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dictionary argument or as kwargs.
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"""
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if args:
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if len(args) != 1 or not isinstance(args[0], dict):
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raise LedisError('MSET requires **kwargs or a single dict arg')
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kwargs.update(args[0])
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items = []
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for pair in iteritems(kwargs):
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items.extend(pair)
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return self.execute_command('MSET', *items)
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def set(self, name, value):
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"""
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Set a key.
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"""
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pieces = [name, value]
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return self.execute_command('SET', *pieces)
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def setnx(self, name, value):
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"Set the value of key ``name`` to ``value`` if key doesn't exist"
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return self.execute_command('SETNX', name, value)
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def ttl(self, name):
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"Returns the number of seconds until the key ``name`` will expire"
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return self.execute_command('TTL', name)
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def persist(self, name):
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return self.execute_command('PERSIST', name)
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#### LIST COMMANDS ####
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def lindex(self, name, index):
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"""
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Return the item from list ``name`` at position ``index``
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Negative indexes are supported and will return an item at the
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end of the list
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"""
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return self.execute_command('LINDEX', name, index)
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def llen(self, name):
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"Return the length of the list ``name``"
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return self.execute_command('LLEN', name)
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def lpop(self, name):
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"Remove and return the first item of the list ``name``"
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return self.execute_command('LPOP', name)
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def lpush(self, name, *values):
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"Push ``values`` onto the head of the list ``name``"
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return self.execute_command('LPUSH', name, *values)
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def lrange(self, name, start, end):
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"""
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Return a slice of the list ``name`` between
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position ``start`` and ``end``
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``start`` and ``end`` can be negative numbers just like
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Python slicing notation
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"""
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return self.execute_command('LRANGE', name, start, end)
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def rpop(self, name):
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"Remove and return the last item of the list ``name``"
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return self.execute_command('RPOP', name)
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def rpush(self, name, *values):
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"Push ``values`` onto the tail of the list ``name``"
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return self.execute_command('RPUSH', name, *values)
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# SPECIAL COMMANDS SUPPORTED BY LEDISDB
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def lclear(self, name):
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return self.execute_command("LCLEAR", name)
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def lmclear(self, *names):
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return self.execute_command('LMCLEAR', *names)
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def lexpire(self, name, time):
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"""
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Set an expire flag on key ``name`` for ``time`` seconds. ``time``
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can be represented by an integer or a Python timedelta object.
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"""
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if isinstance(time, datetime.timedelta):
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time = time.seconds + time.days * 24 * 3600
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return self.execute_command("LEXPIRE", name, time)
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def lexpireat(self, name, when):
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"""
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Set an expire flag on key ``name``. ``when`` can be represented as an integer
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indicating unix time or a Python datetime object.
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"""
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if isinstance(when, datetime.datetime):
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when = int(mod_time.mktime(when.timetuple()))
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return self.execute_command('LEXPIREAT', name, when)
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def lttl(self, name):
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return self.execute_command('LTTL', name)
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def lpersist(self, name):
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return self.execute_command('LPERSIST', name)
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#### SORTED SET COMMANDS ####
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def zadd(self, name, *args, **kwargs):
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"""
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Set any number of score, element-name pairs to the key ``name``. Pairs
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can be specified in two ways:
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As *args, in the form of: score1, name1, score2, name2, ...
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or as **kwargs, in the form of: name1=score1, name2=score2, ...
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The following example would add four values to the 'my-key' key:
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ledis.zadd('my-key', 1.1, 'name1', 2.2, 'name2', name3=3.3, name4=4.4)
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"""
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pieces = []
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if args:
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if len(args) % 2 != 0:
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raise LedisError("ZADD requires an equal number of "
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"values and scores")
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pieces.extend(args)
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for pair in iteritems(kwargs):
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pieces.append(pair[1])
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pieces.append(pair[0])
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return self.execute_command('ZADD', name, *pieces)
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def zcard(self, name):
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"Return the number of elements in the sorted set ``name``"
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return self.execute_command('ZCARD', name)
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def zcount(self, name, min, max):
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return self.execute_command('ZCOUNT', name, min, max)
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def zincrby(self, name, value, amount=1):
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"Increment the score of ``value`` in sorted set ``name`` by ``amount``"
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return self.execute_command('ZINCRBY', name, amount, value)
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def zrange(self, name, start, end, desc=False, withscores=False):
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"""
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Return a range of values from sorted set ``name`` between
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``start`` and ``end`` sorted in ascending order.
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``start`` and ``end`` can be negative, indicating the end of the range.
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``desc`` a boolean indicating whether to sort the results descendingly
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``withscores`` indicates to return the scores along with the values.
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The return type is a list of (value, score) pairs
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``score_cast_func`` a callable used to cast the score return value
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"""
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if desc:
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return self.zrevrange(name, start, end, withscores,
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score_cast_func)
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pieces = ['ZRANGE', name, start, end]
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if withscores:
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pieces.append('withscores')
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options = {
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'withscores': withscores, 'score_cast_func': int}
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return self.execute_command(*pieces, **options)
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def zrangebyscore(self, name, min, max, start=None, num=None,
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withscores=False):
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"""
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Return a range of values from the sorted set ``name`` with scores
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between ``min`` and ``max``.
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If ``start`` and ``num`` are specified, then return a slice
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of the range.
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``withscores`` indicates to return the scores along with the values.
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The return type is a list of (value, score) pairs
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`score_cast_func`` a callable used to cast the score return value
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"""
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if (start is not None and num is None) or \
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(num is not None and start is None):
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raise LedisError("``start`` and ``num`` must both be specified")
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pieces = ['ZRANGEBYSCORE', name, min, max]
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if start is not None and num is not None:
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pieces.extend(['LIMIT', start, num])
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if withscores:
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pieces.append('withscores')
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options = {
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'withscores': withscores, 'score_cast_func': int}
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return self.execute_command(*pieces, **options)
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def zrank(self, name, value):
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"""
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Returns a 0-based value indicating the rank of ``value`` in sorted set
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``name``
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"""
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return self.execute_command('ZRANK', name, value)
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def zrem(self, name, *values):
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"Remove member ``values`` from sorted set ``name``"
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return self.execute_command('ZREM', name, *values)
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def zremrangebyrank(self, name, min, max):
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"""
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Remove all elements in the sorted set ``name`` with ranks between
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``min`` and ``max``. Values are 0-based, ordered from smallest score
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to largest. Values can be negative indicating the highest scores.
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Returns the number of elements removed
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"""
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return self.execute_command('ZREMRANGEBYRANK', name, min, max)
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def zremrangebyscore(self, name, min, max):
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"""
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Remove all elements in the sorted set ``name`` with scores
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between ``min`` and ``max``. Returns the number of elements removed.
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"""
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return self.execute_command('ZREMRANGEBYSCORE', name, min, max)
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def zrevrange(self, name, start, num, withscores=False):
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"""
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Return a range of values from sorted set ``name`` between
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``start`` and ``num`` sorted in descending order.
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``start`` and ``num`` can be negative, indicating the end of the range.
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``withscores`` indicates to return the scores along with the values
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The return type is a list of (value, score) pairs
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``score_cast_func`` a callable used to cast the score return value
|
|
"""
|
|
pieces = ['ZREVRANGE', name, start, num]
|
|
if withscores:
|
|
pieces.append('withscores')
|
|
options = {
|
|
'withscores': withscores, 'score_cast_func': int}
|
|
return self.execute_command(*pieces, **options)
|
|
|
|
def zrevrangebyscore(self, name, min, max, start=None, num=None,
|
|
withscores=False):
|
|
"""
|
|
Return a range of values from the sorted set ``name`` with scores
|
|
between ``min`` and ``max`` in descending order.
|
|
|
|
If ``start`` and ``num`` are specified, then return a slice
|
|
of the range.
|
|
|
|
``withscores`` indicates to return the scores along with the values.
|
|
The return type is a list of (value, score) pairs
|
|
|
|
``score_cast_func`` a callable used to cast the score return value
|
|
"""
|
|
if (start is not None and num is None) or \
|
|
(num is not None and start is None):
|
|
raise LedisError("``start`` and ``num`` must both be specified")
|
|
pieces = ['ZREVRANGEBYSCORE', name, min, max]
|
|
if start is not None and num is not None:
|
|
pieces.extend(['LIMIT', start, num])
|
|
if withscores:
|
|
pieces.append('withscores')
|
|
options = {
|
|
'withscores': withscores, 'score_cast_func': int}
|
|
return self.execute_command(*pieces, **options)
|
|
|
|
def zrevrank(self, name, value):
|
|
"""
|
|
Returns a 0-based value indicating the descending rank of
|
|
``value`` in sorted set ``name``
|
|
"""
|
|
return self.execute_command('ZREVRANK', name, value)
|
|
|
|
def zscore(self, name, value):
|
|
"Return the score of element ``value`` in sorted set ``name``"
|
|
return self.execute_command('ZSCORE', name, value)
|
|
|
|
# SPECIAL COMMANDS SUPPORTED BY LEDISDB
|
|
def zclear(self, name):
|
|
return self.execute_command('ZCLEAR', name)
|
|
|
|
def zmclear(self, *names):
|
|
return self.execute_command('ZMCLEAR', *names)
|
|
|
|
def zexpire(self, name, time):
|
|
if isinstance(time, datetime.timedelta):
|
|
time = time.seconds + time.days * 24 * 3600
|
|
return self.execute_command('ZEXPIRE', name, time)
|
|
|
|
def zexpireat(self, name, when):
|
|
if isinstance(when, datetime.datetime):
|
|
when = int(mod_time.mktime(when.timetuple()))
|
|
return self.execute_command('ZEXPIREAT', name, when)
|
|
|
|
def zttl(self, name):
|
|
return self.execute_command('ZTTL', name)
|
|
|
|
def zpersist(self, name):
|
|
return self.execute_command('ZPERSIST', name)
|
|
|
|
|
|
|
|
#### HASH COMMANDS ####
|
|
def hdel(self, name, *keys):
|
|
"Delete ``keys`` from hash ``name``"
|
|
return self.execute_command('HDEL', name, *keys)
|
|
|
|
def hexists(self, name, key):
|
|
"Returns a boolean indicating if ``key`` exists within hash ``name``"
|
|
return self.execute_command('HEXISTS', name, key)
|
|
|
|
def hget(self, name, key):
|
|
"Return the value of ``key`` within the hash ``name``"
|
|
return self.execute_command('HGET', name, key)
|
|
|
|
def hgetall(self, name):
|
|
"Return a Python dict of the hash's name/value pairs"
|
|
return self.execute_command('HGETALL', name)
|
|
|
|
def hincrby(self, name, key, amount=1):
|
|
"Increment the value of ``key`` in hash ``name`` by ``amount``"
|
|
return self.execute_command('HINCRBY', name, key, amount)
|
|
|
|
def hkeys(self, name):
|
|
"Return the list of keys within hash ``name``"
|
|
return self.execute_command('HKEYS', name)
|
|
|
|
def hlen(self, name):
|
|
"Return the number of elements in hash ``name``"
|
|
return self.execute_command('HLEN', name)
|
|
|
|
def hmget(self, name, keys, *args):
|
|
"Returns a list of values ordered identically to ``keys``"
|
|
args = list_or_args(keys, args)
|
|
return self.execute_command('HMGET', name, *args)
|
|
|
|
def hmset(self, name, mapping):
|
|
"""
|
|
Sets each key in the ``mapping`` dict to its corresponding value
|
|
in the hash ``name``
|
|
"""
|
|
if not mapping:
|
|
raise DataError("'hmset' with 'mapping' of length 0")
|
|
items = []
|
|
for pair in iteritems(mapping):
|
|
items.extend(pair)
|
|
return self.execute_command('HMSET', name, *items)
|
|
|
|
def hset(self, name, key, value):
|
|
"""
|
|
Set ``key`` to ``value`` within hash ``name``
|
|
Returns 1 if HSET created a new field, otherwise 0
|
|
"""
|
|
return self.execute_command('HSET', name, key, value)
|
|
|
|
def hvals(self, name):
|
|
"Return the list of values within hash ``name``"
|
|
return self.execute_command('HVALS', name)
|
|
|
|
# SPECIAL COMMANDS SUPPORTED BY LEDISDB
|
|
def hclear(self, name):
|
|
return self.execute_command('HCLEAR', name)
|
|
|
|
def hmclear(self, *names):
|
|
return self.execute_command('HMCLEAR', *names)
|
|
|
|
def hexpire(self, name, time):
|
|
if isinstance(time, datetime.timedelta):
|
|
time = time.seconds + time.days * 24 * 3600
|
|
return self.execute_command('HEXPIRE', name, time)
|
|
|
|
def hexpireat(self, name, when):
|
|
if isinstance(when, datetime.datetime):
|
|
when = int(mod_time.mktime(when.timetuple()))
|
|
return self.execute_command('HEXPIREAT', name, when)
|
|
|
|
def httl(self, name):
|
|
return self.execute_command('HTTL', name)
|
|
|
|
def hpersist(self, name):
|
|
return self.execute_command('HPERSIST', name)
|
|
|