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from __future__ import annotations
import time
from typing import TYPE_CHECKING, cast
from limits.aio.storage.redis.bridge import RedisBridge
from limits.errors import ConfigurationError
from limits.typing import AsyncCoRedisClient, Callable
if TYPE_CHECKING:
import coredis
class CoredisBridge(RedisBridge):
DEFAULT_CLUSTER_OPTIONS: dict[str, float | str | bool] = {
"max_connections": 1000,
}
"Default options passed to :class:`coredis.RedisCluster`"
@property
def base_exceptions(self) -> type[Exception] | tuple[type[Exception], ...]:
return (self.dependency.exceptions.RedisError,)
def use_sentinel(
self,
service_name: str | None,
use_replicas: bool,
sentinel_kwargs: dict[str, str | float | bool] | None,
**options: str | float | bool,
) -> None:
sentinel_configuration = []
connection_options = options.copy()
sep = self.parsed_uri.netloc.find("@") + 1
for loc in self.parsed_uri.netloc[sep:].split(","):
host, port = loc.split(":")
sentinel_configuration.append((host, int(port)))
service_name = (
self.parsed_uri.path.replace("/", "")
if self.parsed_uri.path
else service_name
)
if service_name is None:
raise ConfigurationError("'service_name' not provided")
self.sentinel = self.dependency.sentinel.Sentinel(
sentinel_configuration,
sentinel_kwargs={**self.parsed_auth, **(sentinel_kwargs or {})},
**{**self.parsed_auth, **connection_options},
)
self.storage = self.sentinel.primary_for(service_name)
self.storage_replica = self.sentinel.replica_for(service_name)
self.connection_getter = lambda readonly: (
self.storage_replica if readonly and use_replicas else self.storage
)
def use_basic(self, **options: str | float | bool) -> None:
if connection_pool := options.pop("connection_pool", None):
self.storage = self.dependency.Redis(
connection_pool=connection_pool, **options
)
else:
self.storage = self.dependency.Redis.from_url(self.uri, **options)
self.connection_getter = lambda _: self.storage
def use_cluster(self, **options: str | float | bool) -> None:
sep = self.parsed_uri.netloc.find("@") + 1
cluster_hosts: list[dict[str, int | str]] = []
cluster_hosts.extend(
{"host": host, "port": int(port)}
for loc in self.parsed_uri.netloc[sep:].split(",")
if loc
for host, port in [loc.split(":")]
)
self.storage = self.dependency.RedisCluster(
startup_nodes=cluster_hosts,
**{**self.DEFAULT_CLUSTER_OPTIONS, **self.parsed_auth, **options},
)
self.connection_getter = lambda _: self.storage
lua_moving_window: coredis.commands.Script[bytes]
lua_acquire_moving_window: coredis.commands.Script[bytes]
lua_sliding_window: coredis.commands.Script[bytes]
lua_acquire_sliding_window: coredis.commands.Script[bytes]
lua_clear_keys: coredis.commands.Script[bytes]
lua_incr_expire: coredis.commands.Script[bytes]
connection_getter: Callable[[bool], AsyncCoRedisClient]
def get_connection(self, readonly: bool = False) -> AsyncCoRedisClient:
return self.connection_getter(readonly)
def register_scripts(self) -> None:
self.lua_moving_window = self.get_connection().register_script(
self.SCRIPT_MOVING_WINDOW
)
self.lua_acquire_moving_window = self.get_connection().register_script(
self.SCRIPT_ACQUIRE_MOVING_WINDOW
)
self.lua_clear_keys = self.get_connection().register_script(
self.SCRIPT_CLEAR_KEYS
)
self.lua_incr_expire = self.get_connection().register_script(
self.SCRIPT_INCR_EXPIRE
)
self.lua_sliding_window = self.get_connection().register_script(
self.SCRIPT_SLIDING_WINDOW
)
self.lua_acquire_sliding_window = self.get_connection().register_script(
self.SCRIPT_ACQUIRE_SLIDING_WINDOW
)
async def incr(
self, key: str, expiry: int, elastic_expiry: bool = False, amount: int = 1
) -> int:
key = self.prefixed_key(key)
value = await self.get_connection().incrby(key, amount)
if elastic_expiry or value == amount:
await self.get_connection().expire(key, expiry)
return value
async def get(self, key: str) -> int:
key = self.prefixed_key(key)
return int(await self.get_connection(readonly=True).get(key) or 0)
async def clear(self, key: str) -> None:
key = self.prefixed_key(key)
await self.get_connection().delete([key])
async def lua_reset(self) -> int | None:
return cast(int, await self.lua_clear_keys.execute([self.prefixed_key("*")]))
async def get_moving_window(
self, key: str, limit: int, expiry: int
) -> tuple[float, int]:
key = self.prefixed_key(key)
timestamp = time.time()
window = await self.lua_moving_window.execute(
[key], [timestamp - expiry, limit]
)
if window:
return float(window[0]), window[1] # type: ignore
return timestamp, 0
async def get_sliding_window(
self, previous_key: str, current_key: str, expiry: int
) -> tuple[int, float, int, float]:
previous_key = self.prefixed_key(previous_key)
current_key = self.prefixed_key(current_key)
if window := await self.lua_sliding_window.execute(
[previous_key, current_key], [expiry]
):
return (
int(window[0] or 0), # type: ignore
max(0, float(window[1] or 0)) / 1000, # type: ignore
int(window[2] or 0), # type: ignore
max(0, float(window[3] or 0)) / 1000, # type: ignore
)
return 0, 0.0, 0, 0.0
async def acquire_entry(
self, key: str, limit: int, expiry: int, amount: int = 1
) -> bool:
key = self.prefixed_key(key)
timestamp = time.time()
acquired = await self.lua_acquire_moving_window.execute(
[key], [timestamp, limit, expiry, amount]
)
return bool(acquired)
async def acquire_sliding_window_entry(
self,
previous_key: str,
current_key: str,
limit: int,
expiry: int,
amount: int = 1,
) -> bool:
previous_key = self.prefixed_key(previous_key)
current_key = self.prefixed_key(current_key)
acquired = await self.lua_acquire_sliding_window.execute(
[previous_key, current_key], [limit, expiry, amount]
)
return bool(acquired)
async def get_expiry(self, key: str) -> float:
key = self.prefixed_key(key)
return max(await self.get_connection().ttl(key), 0) + time.time()
async def check(self) -> bool:
try:
await self.get_connection().ping()
return True
except: # noqa
return False
async def reset(self) -> int | None:
prefix = self.prefixed_key("*")
keys = await self.storage.keys(prefix)
count = 0
for key in keys:
count += await self.storage.delete([key])
return count
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