514 lines
14 KiB
Python
514 lines
14 KiB
Python
# Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
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# License: MIT. See LICENSE
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import pickle
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import re
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import threading
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import time
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import typing
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from contextlib import suppress
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import redis
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from redis.commands.search import Search
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import frappe
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from frappe.utils import cstr
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from frappe.utils.data import cint
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# 5 is faster than default which is 4.
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# Python uses old protocol for backward compatibility, we don't support anything <3.10.
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DEFAULT_PICKLE_PROTOCOL = 5
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class RedisearchWrapper(Search):
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def sugadd(self, key, *suggestions, **kwargs):
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return super().sugadd(self.client.make_key(key), *suggestions, **kwargs)
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def suglen(self, key):
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return super().suglen(self.client.make_key(key))
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def sugdel(self, key, string):
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return super().sugdel(self.client.make_key(key), string)
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def sugget(self, key, *args, **kwargs):
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return super().sugget(self.client.make_key(key), *args, **kwargs)
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class RedisWrapper(redis.Redis):
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"""Redis client that will automatically prefix conf.db_name"""
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def connected(self):
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try:
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self.ping()
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return True
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except redis.exceptions.ConnectionError:
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return False
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def __call__(self):
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"""WARNING: Added for backward compatibility to support frappe.cache().method(...)"""
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return self
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def make_key(self, key, user=None, shared=False):
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if shared:
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return key
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if user:
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if user is True:
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user = frappe.session.user
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key = f"user:{user}:{key}"
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return f"{frappe.conf.db_name}|{key}".encode()
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def set_value(self, key, val, user=None, expires_in_sec=None, shared=False):
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"""Sets cache value.
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:param key: Cache key
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:param val: Value to be cached
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:param user: Prepends key with User
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:param expires_in_sec: Expire value of this key in X seconds
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"""
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key = self.make_key(key, user, shared)
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frappe.local.cache[key] = val
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with suppress(redis.exceptions.ConnectionError):
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self.set(name=key, value=pickle.dumps(val, protocol=DEFAULT_PICKLE_PROTOCOL), ex=expires_in_sec)
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def get_value(self, key, generator=None, user=None, expires=False, shared=False, *, use_local_cache=True):
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"""Return cache value. If not found and generator function is
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given, call the generator.
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:param key: Cache key.
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:param generator: Function to be called to generate a value if `None` is returned.
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:param expires: If the key is supposed to be with an expiry, don't store it in frappe.local
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"""
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original_key = key
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key = self.make_key(key, user, shared)
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local_cache = frappe.local.cache
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if key in local_cache and use_local_cache:
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val = local_cache[key]
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else:
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val = None
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try:
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val = self.get(key)
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except redis.exceptions.ConnectionError:
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pass
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if val is not None:
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val = pickle.loads(val)
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if not expires:
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if val is None and generator:
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val = generator()
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self.set_value(original_key, val, user=user)
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else:
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local_cache[key] = val
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return val
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def get_all(self, key):
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ret = {}
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for k in self.get_keys(key):
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ret[key] = self.get_value(k)
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return ret
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def get_keys(self, key):
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"""Return keys starting with `key`."""
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try:
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key = self.make_key(key + "*")
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return self.keys(key)
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except redis.exceptions.ConnectionError:
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regex = re.compile(cstr(key).replace("|", r"\|").replace("*", r"[\w]*"))
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return [k for k in list(frappe.local.cache) if regex.match(cstr(k))]
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def delete_keys(self, key):
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"""Delete keys with wildcard `*`."""
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self.delete_value(self.get_keys(key), make_keys=False)
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def delete_key(self, *args, **kwargs):
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self.delete_value(*args, **kwargs)
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def delete_value(self, keys, user=None, make_keys=True, shared=False):
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"""Delete value, list of values."""
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if not keys:
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return
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if not isinstance(keys, list | tuple):
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keys = (keys,)
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if make_keys:
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keys = [self.make_key(k, shared=shared, user=user) for k in keys]
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local_cache = frappe.local.cache
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for key in keys:
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local_cache.pop(key, None)
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try:
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self.unlink(*keys)
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except redis.exceptions.ConnectionError:
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pass
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def lpush(self, key, value):
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return super().lpush(self.make_key(key), value)
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def rpush(self, key, value):
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return super().rpush(self.make_key(key), value)
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def lpop(self, key):
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return super().lpop(self.make_key(key))
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def rpop(self, key):
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return super().rpop(self.make_key(key))
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def llen(self, key):
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return super().llen(self.make_key(key))
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def lrange(self, key, start, stop):
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return super().lrange(self.make_key(key), start, stop)
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def ltrim(self, key, start, stop):
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return super().ltrim(self.make_key(key), start, stop)
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def hset(
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self,
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name: str,
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key: str,
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value,
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shared: bool = False,
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*args,
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**kwargs,
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):
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if key is None:
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return
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_name = self.make_key(name, shared=shared)
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# set in local
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frappe.local.cache.setdefault(_name, {})[key] = value
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# set in redis
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try:
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super().hset(_name, key, pickle.dumps(value, protocol=DEFAULT_PICKLE_PROTOCOL), *args, **kwargs)
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except redis.exceptions.ConnectionError:
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pass
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def hexists(self, name: str, key: str, shared: bool = False) -> bool:
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if key is None:
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return False
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_name = self.make_key(name, shared=shared)
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try:
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return super().hexists(_name, key)
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except redis.exceptions.ConnectionError:
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return False
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def exists(self, *names: str, user=None, shared=None) -> int:
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names = [self.make_key(n, user=user, shared=shared) for n in names]
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try:
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return super().exists(*names)
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except redis.exceptions.ConnectionError:
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return False
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def hgetall(self, name):
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value = super().hgetall(self.make_key(name))
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return {key: pickle.loads(value) for key, value in value.items()}
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def hget(self, name, key, generator=None, shared=False):
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_name = self.make_key(name, shared=shared)
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local_cache = frappe.local.cache
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if _name not in local_cache:
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local_cache[_name] = {}
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if not key:
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return None
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if key in local_cache[_name]:
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return local_cache[_name][key]
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value = None
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try:
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value = super().hget(_name, key)
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except redis.exceptions.ConnectionError:
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pass
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if value is not None:
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value = pickle.loads(value)
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local_cache[_name][key] = value
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elif generator:
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value = generator()
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self.hset(name, key, value, shared=shared)
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return value
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def hdel(
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self,
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name: str,
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keys: str | list | tuple,
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shared=False,
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pipeline: redis.client.Pipeline | None = None,
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):
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"""
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A wrapper around redis' HDEL command
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:param name: The hash name
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:param keys: the keys to delete
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:param shared: shared frappe key or not
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:param pipeline: A redis.client.Pipeline object, if this transaction is to be run in a pipeline
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"""
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_name = self.make_key(name, shared=shared)
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name_in_local_cache = _name in frappe.local.cache
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if not isinstance(keys, list | tuple):
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if name_in_local_cache and keys in frappe.local.cache[_name]:
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del frappe.local.cache[_name][keys]
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if pipeline:
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pipeline.hdel(_name, keys)
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else:
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try:
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super().hdel(_name, keys)
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except redis.exceptions.ConnectionError:
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pass
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return
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local_pipeline = False
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if pipeline is None:
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pipeline = self.pipeline()
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local_pipeline = True
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for key in keys:
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if name_in_local_cache:
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if key in frappe.local.cache[_name]:
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del frappe.local.cache[_name][key]
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pipeline.hdel(_name, key)
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if local_pipeline:
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try:
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pipeline.execute()
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except redis.exceptions.ConnectionError:
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pass
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def hdel_names(self, names: list | tuple, key: str):
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"""
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A function to call HDEL on multiple hash names with a common key, run in a single pipeline
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:param names: The hash names
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:param key: The common key
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"""
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pipeline = self.pipeline()
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for name in names:
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self.hdel(name, key, pipeline=pipeline)
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try:
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pipeline.execute()
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except redis.exceptions.ConnectionError:
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pass
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def hdel_keys(self, name_starts_with, key):
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"""Delete hash names with wildcard `*` and key"""
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pipeline = self.pipeline()
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for name in self.get_keys(name_starts_with):
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name = name.split("|", 1)[1]
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self.hdel(name, key, pipeline=pipeline)
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try:
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pipeline.execute()
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except redis.exceptions.ConnectionError:
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pass
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def hkeys(self, name):
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try:
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return super().hkeys(self.make_key(name))
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except redis.exceptions.ConnectionError:
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return []
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def sadd(self, name, *values):
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"""Add a member/members to a given set"""
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super().sadd(self.make_key(name), *values)
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def srem(self, name, *values):
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"""Remove a specific member/list of members from the set."""
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super().srem(self.make_key(name), *values)
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def sismember(self, name, value):
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"""Return True or False based on if a given value is present in the set."""
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return super().sismember(self.make_key(name), value)
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def spop(self, name):
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"""Remove and returns a random member from the set."""
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return super().spop(self.make_key(name))
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def srandmember(self, name, count=None):
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"""Return a random member from the set."""
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return super().srandmember(self.make_key(name))
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def smembers(self, name):
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"""Return all members of the set."""
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return super().smembers(self.make_key(name))
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def ft(self, index_name="idx"):
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return RedisearchWrapper(client=self, index_name=self.make_key(index_name))
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def setup_cache() -> RedisWrapper:
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if frappe.conf.redis_cache_sentinel_enabled:
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sentinels = [tuple(node.split(":")) for node in frappe.conf.get("redis_cache_sentinels", [])]
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sentinel = get_sentinel_connection(
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sentinels=sentinels,
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sentinel_username=frappe.conf.get("redis_cache_sentinel_username"),
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sentinel_password=frappe.conf.get("redis_cache_sentinel_password"),
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master_username=frappe.conf.get("redis_cache_master_username"),
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master_password=frappe.conf.get("redis_cache_master_password"),
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)
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return sentinel.master_for(
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frappe.conf.get("redis_cache_master_service"),
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redis_class=RedisWrapper,
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)
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return RedisWrapper.from_url(frappe.conf.get("redis_cache"))
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def get_sentinel_connection(
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sentinels: list[tuple[str, int]],
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sentinel_username=None,
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sentinel_password=None,
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master_username=None,
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master_password=None,
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):
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from redis.sentinel import Sentinel
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sentinel_kwargs = {}
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if sentinel_username:
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sentinel_kwargs["username"] = sentinel_username
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if sentinel_password:
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sentinel_kwargs["password"] = sentinel_password
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return Sentinel(
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sentinels=sentinels,
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sentinel_kwargs=sentinel_kwargs,
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username=master_username,
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password=master_password,
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)
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class _TrackedConnection(redis.Connection):
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def __init__(self, *args, **kwargs):
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self.monitor_id = kwargs.pop("_monitor_id")
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super().__init__(*args, **kwargs)
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# Every redis connection needs to enable client tracking to get notified about invalidated
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# keys.
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self.register_connect_callback(self._enable_client_tracking)
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def _enable_client_tracking(self, conn):
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conn.send_command("CLIENT", "TRACKING", "ON", "redirect", self.monitor_id, "NOLOOP")
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conn.read_response()
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_ClientCacheValue = tuple[typing.Any, int]
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class _ClientCache:
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def __init__(self, maxsize: int = 1024, ttl=10 * 60, monitor: RedisWrapper | None = None) -> None:
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self.monitor = frappe.cache
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self.monitor_id = self.monitor.client_id()
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self.maxsize = maxsize or 1024 # Expect 1024 * 4kb objects ~ 4MB
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self.local_ttl = ttl
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self.expiration = time.monotonic() + ttl
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self._lock = threading.RLock()
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self.redis: RedisWrapper = RedisWrapper.from_url(
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frappe.conf.get("redis_cache"),
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connection_class=_TrackedConnection,
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_monitor_id=self.monitor_id,
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)
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protocol = self.redis.get_connection_kwargs().get("protocol")
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if cint(protocol) == 3:
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frappe.throw("RESP3 is not supported while connecting to Redis.") # nosemgrep
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self.invalidator_thread = self.run_invalidator_thread()
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self.local_cache: dict[bytes, _ClientCacheValue] = {}
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self.cache_healthy = True
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self._conn_retries = 0
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def get_value(self, key):
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key = self.redis.make_key(key)
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try:
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val = self.local_cache[key]
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if time.monotonic() < val[1] and self.cache_healthy:
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return val[0]
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except KeyError:
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pass # cache miss
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val = self.redis.get_value(key, shared=True, use_local_cache=False)
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# Note: We should not "cache" the cache-misses in client cache.
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# This cache is long lived and "misses" are not tracked by redis so they'll never get
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# invalidated.
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if val is None:
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return None
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self.ensure_max_size()
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with self._lock:
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self.local_cache[key] = (val, time.monotonic() + self.local_ttl)
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return val
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def set_value(self, key, val):
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key = self.redis.make_key(key)
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self.ensure_max_size()
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self.redis.set_value(key, val, shared=True)
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with self._lock:
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self.local_cache[key] = (val, time.monotonic() + self.local_ttl)
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# XXX: We need to tell redis that we indeed read this key we just wrote
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# This is an edge case:
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# - Client A writes a key and reads it again from local cache
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# - Client B overwrites this key, but since client A never "read" it from Redis, Redis
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# doesn't send invalidation.
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_ = self.redis.get_value(key, shared=True, use_local_cache=False)
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def ensure_max_size(self):
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if len(self.local_cache) >= self.maxsize:
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with self._lock, suppress(RuntimeError):
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self.local_cache.pop(next(iter(self.local_cache)), None)
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def delete_value(self, key):
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key = self.redis.make_key(key)
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self.redis.delete_value(key, shared=True)
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with self._lock:
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self.local_cache.pop(key, None)
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def run_invalidator_thread(self):
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self._watcher = self.monitor.pubsub()
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self._watcher.subscribe(**{"__redis__:invalidate": self._handle_invalidation})
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return self._watcher.run_in_thread(
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sleep_time=None,
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daemon=True,
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exception_handler=self._exception_handler,
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)
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def _handle_invalidation(self, message):
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if message["data"] is None:
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# Flushall
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self.clear_cache()
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with self._lock:
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for key in message["data"]:
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self.local_cache.pop(key, None)
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def _exception_handler(self, exc, pubsub, pubsub_thread):
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if isinstance(exc, (redis.exceptions.ConnectionError)):
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self.clear_cache()
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self._conn_retries += 1
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if self._conn_retries > 10:
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self.cache_healthy = False
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raise
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time.sleep(1)
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else:
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self.cache_healthy = False
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raise
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def clear_cache(self):
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with self._lock:
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self.local_cache.clear()
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