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import functools
from typing import Callable, List, Optional, Union, Any
from fakeredis import _msgs as msgs
from fakeredis._command_args_parsing import extract_args
from fakeredis._commands import Key, command, Int, CommandItem, Timeout, fix_range
from fakeredis._helpers import OK, SimpleError, SimpleString, casematch, Database
def _list_pop_count(get_slice, key, count):
if not key:
return None
elif type(key.value) is not list:
raise SimpleError(msgs.WRONGTYPE_MSG)
slc = get_slice(count)
ret = key.value[slc]
del key.value[slc]
key.updated()
return ret
def _list_pop(get_slice, key, *args):
"""Implements lpop and rpop.
`get_slice` must take a count and return a slice expression for the range to pop.
"""
# This implementation is somewhat contorted to match the odd
# behaviours described in https://github.com/redis/redis/issues/9680.
count = 1
if len(args) > 1:
raise SimpleError(msgs.SYNTAX_ERROR_MSG)
elif len(args) == 1:
count = Int.decode(args[0], msgs.INDEX_NEGATIVE_ERROR_MSG)
if count < 0:
raise SimpleError(msgs.INDEX_NEGATIVE_ERROR_MSG)
ret = _list_pop_count(get_slice, key, count)
if ret and not args:
ret = ret[0]
return ret
class ListCommandsMixin:
_blocking: Callable[[Optional[Union[float, int]], Callable[[bool], Any]], Any]
def __init__(self, *args, **kwargs):
super(ListCommandsMixin, self).__init__(*args, **kwargs)
self._db: Database
def _bpop_pass(self, keys, op, first_pass):
for key in keys:
item = CommandItem(key, self._db, item=self._db.get(key), default=[])
if not isinstance(item.value, list):
if first_pass:
raise SimpleError(msgs.WRONGTYPE_MSG)
else:
continue
if item.value:
ret = op(item.value)
item.updated()
item.writeback()
return [key, ret]
return None
def _bpop(self, args, op):
keys = args[:-1]
timeout = Timeout.decode(args[-1])
return self._blocking(timeout, functools.partial(self._bpop_pass, keys, op))
@command((bytes, bytes), (bytes,), flags=msgs.FLAG_NO_SCRIPT)
def blpop(self, *args):
return self._bpop(args, lambda lst: lst.pop(0))
@command((bytes, bytes), (bytes,), flags=msgs.FLAG_NO_SCRIPT)
def brpop(self, *args):
return self._bpop(args, lambda lst: lst.pop())
def _brpoplpush_pass(self, source, destination, first_pass):
src = CommandItem(source, self._db, item=self._db.get(source), default=[])
if not isinstance(src.value, list):
if first_pass:
raise SimpleError(msgs.WRONGTYPE_MSG)
else:
return None
if not src.value:
return None # Empty list
dst = CommandItem(destination, self._db, item=self._db.get(destination), default=[])
if not isinstance(dst.value, list):
raise SimpleError(msgs.WRONGTYPE_MSG)
el = src.value.pop()
dst.value.insert(0, el)
src.updated()
src.writeback()
if destination != source:
# Ensure writeback only happens once
dst.updated()
dst.writeback()
return el
@command(name="BRPOPLPUSH", fixed=(bytes, bytes, Timeout), flags=msgs.FLAG_NO_SCRIPT)
def brpoplpush(self, source, destination, timeout):
return self._blocking(timeout, functools.partial(self._brpoplpush_pass, source, destination))
@command((Key(list, None), Int))
def lindex(self, key, index):
try:
return key.value[index]
except IndexError:
return None
@command((Key(list), bytes, bytes, bytes))
def linsert(self, key, where, pivot, value):
if not casematch(where, b"before") and not casematch(where, b"after"):
raise SimpleError(msgs.SYNTAX_ERROR_MSG)
if not key:
return 0
else:
try:
index = key.value.index(pivot)
except ValueError:
return -1
if casematch(where, b"after"):
index += 1
key.value.insert(index, value)
key.updated()
return len(key.value)
@command((Key(list),))
def llen(self, key):
return len(key.value)
def _lmove(self, first_list, second_list, src, dst, first_pass):
if (not casematch(src, b"left") and not casematch(src, b"right")) or (
not casematch(dst, b"left") and not casematch(dst, b"right")
):
raise SimpleError(msgs.SYNTAX_ERROR_MSG)
el = self.rpop(first_list) if casematch(src, b"RIGHT") else self.lpop(first_list)
self.lpush(second_list, el) if casematch(dst, b"LEFT") else self.rpush(second_list, el)
return el
@command((Key(list, None), Key(list), SimpleString, SimpleString))
def lmove(self, first_list, second_list, src, dst):
return self._lmove(first_list, second_list, src, dst, False)
@command((Key(list, None), Key(list), SimpleString, SimpleString, Timeout))
def blmove(self, first_list, second_list, src, dst, timeout):
return self._blocking(timeout, functools.partial(self._lmove, first_list, second_list, src, dst))
@command(fixed=(Key(),), repeat=(bytes,))
def lpop(self, key, *args):
return _list_pop(lambda count: slice(None, count), key, *args)
def _lmpop(self, keys, count, direction_left, first_pass):
if direction_left:
op = lambda count: slice(None, count) # noqa:E731
else:
op = lambda count: slice(None, -count - 1, -1) # noqa:E731
for key in keys:
item = CommandItem(key, self._db, item=self._db.get(key), default=[])
res = _list_pop_count(op, item, count)
if res:
return [key, res]
return None
@command(fixed=(Int,), repeat=(bytes,))
def lmpop(self, numkeys, *args):
if numkeys <= 0:
raise SimpleError(msgs.NUMKEYS_GREATER_THAN_ZERO_MSG)
if casematch(args[-2], b"count"):
count = Int.decode(args[-1])
args = args[:-2]
else:
count = 1
if len(args) != numkeys + 1 or (not casematch(args[-1], b"left") and not casematch(args[-1], b"right")):
raise SimpleError(msgs.SYNTAX_ERROR_MSG)
return self._lmpop(args[:-1], count, casematch(args[-1], b"left"), False)
@command(fixed=(Timeout, Int), repeat=(bytes,))
def blmpop(self, timeout, numkeys, *args):
if numkeys <= 0:
raise SimpleError(msgs.NUMKEYS_GREATER_THAN_ZERO_MSG)
if casematch(args[-2], b"count"):
count = Int.decode(args[-1])
args = args[:-2]
else:
count = 1
if len(args) != numkeys + 1 or (not casematch(args[-1], b"left") and not casematch(args[-1], b"right")):
raise SimpleError(msgs.SYNTAX_ERROR_MSG)
return self._blocking(
timeout,
functools.partial(self._lmpop, args[:-1], count, casematch(args[-1], b"left")),
)
@command((Key(list), bytes), (bytes,))
def lpush(self, key, *values):
for value in values:
key.value.insert(0, value)
key.updated()
return len(key.value)
@command((Key(list), bytes), (bytes,))
def lpushx(self, key, *values):
if not key:
return 0
return self.lpush(key, *values)
@command((Key(list), Int, Int))
def lrange(self, key, start, stop):
start, stop = fix_range(start, stop, len(key.value))
return key.value[start:stop]
@command((Key(list), Int, bytes))
def lrem(self, key, count, value):
a_list = key.value
found = []
for i, el in enumerate(a_list):
if el == value:
found.append(i)
if count > 0:
indices_to_remove = found[:count]
elif count < 0:
indices_to_remove = found[count:]
else:
indices_to_remove = found
# Iterating in reverse order to ensure the indices
# remain valid during deletion.
for index in reversed(indices_to_remove):
del a_list[index]
if indices_to_remove:
key.updated()
return len(indices_to_remove)
@command((Key(list), bytes, bytes))
def lset(self, key, index, value):
if not key:
raise SimpleError(msgs.NO_KEY_MSG)
index = Int.decode(index)
try:
key.value[index] = value
key.updated()
except IndexError:
raise SimpleError(msgs.INDEX_ERROR_MSG)
return OK
@command((Key(list), Int, Int))
def ltrim(self, key, start, stop):
if key:
if stop == -1:
stop = None
else:
stop += 1
new_value = key.value[start:stop]
# TODO: check if this should actually be conditional
if len(new_value) != len(key.value):
key.update(new_value)
return OK
@command(fixed=(Key(),), repeat=(bytes,))
def rpop(self, key, *args):
return _list_pop(lambda count: slice(None, -count - 1, -1), key, *args)
@command((Key(list, None), Key(list)))
def rpoplpush(self, src, dst):
el = self.rpop(src)
self.lpush(dst, el)
return el
@command((Key(list), bytes), (bytes,))
def rpush(self, key, *values):
for value in values:
key.value.append(value)
key.updated()
return len(key.value)
@command((Key(list), bytes), (bytes,))
def rpushx(self, key, *values):
if not key:
return 0
return self.rpush(key, *values)
@command(fixed=(Key(list), bytes), repeat=(bytes,))
def lpos(self, key, elem, *args):
(rank, count, maxlen), _ = extract_args(
args,
(
"+rank",
"+count",
"+maxlen",
),
)
if rank == 0:
raise SimpleError(msgs.LPOS_RANK_CAN_NOT_BE_ZERO)
rank = rank or 1
ind, direction = (0, 1) if rank > 0 else (len(key.value) - 1, -1)
rank = abs(rank)
parse_count = len(key.value) if count == 0 else (count or 1)
maxlen = maxlen or len(key.value)
res: List[int] = []
comparisons = 0
while 0 <= ind <= len(key.value) - 1 and len(res) < parse_count and comparisons < maxlen:
comparisons += 1
if key.value[ind] == elem:
if rank > 1:
rank -= 1
else:
res.append(ind)
ind += direction
if len(res) == 0 and count is None:
return None
if len(res) == 1 and count is None:
return res[0]
return res
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