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