mirror of
https://github.com/checktheroads/hyperglass
synced 2024-05-11 05:55:08 +00:00
147 lines
4.5 KiB
Python
147 lines
4.5 KiB
Python
"""Asyncio Redis cache handler."""
|
|
|
|
# Standard Library
|
|
import json
|
|
import time
|
|
import pickle
|
|
import asyncio
|
|
from typing import Any, Dict
|
|
|
|
# Third Party
|
|
from aredis import StrictRedis as AsyncRedis # type: ignore
|
|
from aredis.pubsub import PubSub as AsyncPubSub # type: ignore
|
|
from aredis.exceptions import RedisError # type: ignore
|
|
|
|
# Project
|
|
from hyperglass.cache.base import BaseCache
|
|
from hyperglass.exceptions.private import DependencyError
|
|
|
|
|
|
class AsyncCache(BaseCache):
|
|
"""Asynchronous Redis cache handler."""
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
"""Initialize Redis connection."""
|
|
super().__init__(*args, **kwargs)
|
|
|
|
password = self.password
|
|
if password is not None:
|
|
password = password.get_secret_value()
|
|
|
|
self.instance: AsyncRedis = AsyncRedis(
|
|
db=self.db,
|
|
host=self.host,
|
|
port=self.port,
|
|
password=password,
|
|
decode_responses=self.decode_responses,
|
|
**self.redis_args,
|
|
)
|
|
|
|
async def test(self):
|
|
"""Send an echo to Redis to ensure it can be reached."""
|
|
try:
|
|
await self.instance.echo("hyperglass test")
|
|
except RedisError as err:
|
|
err_msg = str(err)
|
|
if not err_msg and hasattr(err, "__context__"):
|
|
# Some Redis exceptions are raised without a message
|
|
# even if they are raised from another exception that
|
|
# does have a message.
|
|
err_msg = str(err.__context__)
|
|
|
|
if "auth" in err_msg.lower():
|
|
raise DependencyError(
|
|
"Authentication to Redis server {s} failed with message: '{e}'",
|
|
s=repr(self, e=err_msg),
|
|
)
|
|
|
|
else:
|
|
raise DependencyError(
|
|
"Unable to connect to Redis server {s} due to error {e}",
|
|
s=repr(self),
|
|
e=err_msg,
|
|
)
|
|
|
|
async def get(self, *args: str) -> Any:
|
|
"""Get item(s) from cache."""
|
|
if len(args) == 1:
|
|
raw = await self.instance.get(args[0])
|
|
else:
|
|
raw = await self.instance.mget(args)
|
|
return self.parse_types(raw)
|
|
|
|
async def get_dict(self, key: str, field: str = "") -> Any:
|
|
"""Get hash map (dict) item(s)."""
|
|
if not field:
|
|
raw = await self.instance.hgetall(key)
|
|
else:
|
|
raw = await self.instance.hget(key, field)
|
|
|
|
return self.parse_types(raw)
|
|
|
|
async def set(self, key: str, value: str) -> bool:
|
|
"""Set cache values."""
|
|
return await self.instance.set(key, value)
|
|
|
|
async def set_dict(self, key: str, field: str, value: str) -> bool:
|
|
"""Set hash map (dict) values."""
|
|
success = False
|
|
|
|
if isinstance(value, Dict):
|
|
value = json.dumps(value)
|
|
else:
|
|
value = str(value)
|
|
|
|
response = await self.instance.hset(key, field, value)
|
|
|
|
if response in (0, 1):
|
|
success = True
|
|
|
|
return success
|
|
|
|
async def wait(self, pubsub: AsyncPubSub, timeout: int = 30, **kwargs) -> Any:
|
|
"""Wait for pub/sub messages & return posted message."""
|
|
now = time.time()
|
|
timeout = now + timeout
|
|
|
|
while now < timeout:
|
|
|
|
message = await pubsub.get_message(ignore_subscribe_messages=True, **kwargs)
|
|
|
|
if message is not None and message["type"] == "message":
|
|
data = message["data"]
|
|
return self.parse_types(data)
|
|
|
|
await asyncio.sleep(0.01)
|
|
now = time.time()
|
|
|
|
return None
|
|
|
|
async def pubsub(self) -> AsyncPubSub:
|
|
"""Provide an aredis.pubsub.Pubsub instance."""
|
|
return self.instance.pubsub()
|
|
|
|
async def pub(self, key: str, value: str) -> None:
|
|
"""Publish a value."""
|
|
await asyncio.sleep(1)
|
|
await self.instance.publish(key, value)
|
|
|
|
async def clear(self) -> None:
|
|
"""Clear the cache."""
|
|
await self.instance.flushdb()
|
|
|
|
async def delete(self, *keys: str) -> None:
|
|
"""Delete a cache key."""
|
|
await self.instance.delete(*keys)
|
|
|
|
async def expire(self, *keys: str, seconds: int) -> None:
|
|
"""Set timeout of key in seconds."""
|
|
for key in keys:
|
|
await self.instance.expire(key, seconds)
|
|
|
|
async def get_config(self) -> Dict:
|
|
"""Get picked config object from cache."""
|
|
|
|
pickled = await self.instance.get("HYPERGLASS_CONFIG")
|
|
return pickle.loads(pickled)
|