mirror of
https://github.com/MISP/misp-galaxy.git
synced 2024-11-26 16:57:18 +00:00
1525 lines
57 KiB
Python
1525 lines
57 KiB
Python
import copy
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import re
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import threading
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import time
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import warnings
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from itertools import chain
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from typing import Any, Callable, Dict, List, Optional, Type, Union
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from redis._parsers.encoders import Encoder
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from redis._parsers.helpers import (
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_RedisCallbacks,
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_RedisCallbacksRESP2,
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_RedisCallbacksRESP3,
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bool_ok,
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)
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from redis.commands import (
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CoreCommands,
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RedisModuleCommands,
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SentinelCommands,
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list_or_args,
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)
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from redis.connection import (
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AbstractConnection,
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ConnectionPool,
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SSLConnection,
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UnixDomainSocketConnection,
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)
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from redis.credentials import CredentialProvider
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from redis.exceptions import (
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ConnectionError,
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ExecAbortError,
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PubSubError,
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RedisError,
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ResponseError,
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TimeoutError,
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WatchError,
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)
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from redis.lock import Lock
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from redis.retry import Retry
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from redis.utils import (
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HIREDIS_AVAILABLE,
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_set_info_logger,
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get_lib_version,
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safe_str,
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str_if_bytes,
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)
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SYM_EMPTY = b""
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EMPTY_RESPONSE = "EMPTY_RESPONSE"
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# some responses (ie. dump) are binary, and just meant to never be decoded
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NEVER_DECODE = "NEVER_DECODE"
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class CaseInsensitiveDict(dict):
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"Case insensitive dict implementation. Assumes string keys only."
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def __init__(self, data: Dict[str, str]) -> None:
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for k, v in data.items():
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self[k.upper()] = v
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def __contains__(self, k):
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return super().__contains__(k.upper())
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def __delitem__(self, k):
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super().__delitem__(k.upper())
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def __getitem__(self, k):
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return super().__getitem__(k.upper())
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def get(self, k, default=None):
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return super().get(k.upper(), default)
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def __setitem__(self, k, v):
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super().__setitem__(k.upper(), v)
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def update(self, data):
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data = CaseInsensitiveDict(data)
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super().update(data)
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class AbstractRedis:
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pass
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class Redis(RedisModuleCommands, CoreCommands, SentinelCommands):
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"""
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Implementation of the Redis protocol.
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This abstract class provides a Python interface to all Redis commands
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and an implementation of the Redis protocol.
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Pipelines derive from this, implementing how
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the commands are sent and received to the Redis server. Based on
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configuration, an instance will either use a ConnectionPool, or
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Connection object to talk to redis.
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It is not safe to pass PubSub or Pipeline objects between threads.
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"""
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@classmethod
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def from_url(cls, url: str, **kwargs) -> "Redis":
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"""
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Return a Redis client object configured from the given URL
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For example::
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redis://[[username]:[password]]@localhost:6379/0
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rediss://[[username]:[password]]@localhost:6379/0
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unix://[username@]/path/to/socket.sock?db=0[&password=password]
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Three URL schemes are supported:
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- `redis://` creates a TCP socket connection. See more at:
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<https://www.iana.org/assignments/uri-schemes/prov/redis>
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- `rediss://` creates a SSL wrapped TCP socket connection. See more at:
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<https://www.iana.org/assignments/uri-schemes/prov/rediss>
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- ``unix://``: creates a Unix Domain Socket connection.
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The username, password, hostname, path and all querystring values
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are passed through urllib.parse.unquote in order to replace any
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percent-encoded values with their corresponding characters.
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There are several ways to specify a database number. The first value
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found will be used:
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1. A ``db`` querystring option, e.g. redis://localhost?db=0
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2. If using the redis:// or rediss:// schemes, the path argument
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of the url, e.g. redis://localhost/0
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3. A ``db`` keyword argument to this function.
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If none of these options are specified, the default db=0 is used.
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All querystring options are cast to their appropriate Python types.
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Boolean arguments can be specified with string values "True"/"False"
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or "Yes"/"No". Values that cannot be properly cast cause a
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``ValueError`` to be raised. Once parsed, the querystring arguments
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and keyword arguments are passed to the ``ConnectionPool``'s
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class initializer. In the case of conflicting arguments, querystring
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arguments always win.
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"""
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single_connection_client = kwargs.pop("single_connection_client", False)
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connection_pool = ConnectionPool.from_url(url, **kwargs)
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client = cls(
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connection_pool=connection_pool,
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single_connection_client=single_connection_client,
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)
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client.auto_close_connection_pool = True
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return client
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@classmethod
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def from_pool(
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cls: Type["Redis"],
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connection_pool: ConnectionPool,
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) -> "Redis":
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"""
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Return a Redis client from the given connection pool.
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The Redis client will take ownership of the connection pool and
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close it when the Redis client is closed.
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"""
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client = cls(
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connection_pool=connection_pool,
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)
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client.auto_close_connection_pool = True
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return client
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def __init__(
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self,
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host="localhost",
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port=6379,
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db=0,
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password=None,
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socket_timeout=None,
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socket_connect_timeout=None,
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socket_keepalive=None,
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socket_keepalive_options=None,
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connection_pool=None,
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unix_socket_path=None,
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encoding="utf-8",
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encoding_errors="strict",
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charset=None,
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errors=None,
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decode_responses=False,
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retry_on_timeout=False,
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retry_on_error=None,
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ssl=False,
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ssl_keyfile=None,
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ssl_certfile=None,
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ssl_cert_reqs="required",
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ssl_ca_certs=None,
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ssl_ca_path=None,
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ssl_ca_data=None,
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ssl_check_hostname=False,
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ssl_password=None,
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ssl_validate_ocsp=False,
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ssl_validate_ocsp_stapled=False,
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ssl_ocsp_context=None,
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ssl_ocsp_expected_cert=None,
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ssl_min_version=None,
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ssl_ciphers=None,
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max_connections=None,
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single_connection_client=False,
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health_check_interval=0,
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client_name=None,
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lib_name="redis-py",
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lib_version=get_lib_version(),
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username=None,
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retry=None,
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redis_connect_func=None,
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credential_provider: Optional[CredentialProvider] = None,
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protocol: Optional[int] = 2,
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) -> None:
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"""
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Initialize a new Redis client.
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To specify a retry policy for specific errors, first set
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`retry_on_error` to a list of the error/s to retry on, then set
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`retry` to a valid `Retry` object.
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To retry on TimeoutError, `retry_on_timeout` can also be set to `True`.
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Args:
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single_connection_client:
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if `True`, connection pool is not used. In that case `Redis`
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instance use is not thread safe.
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"""
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if not connection_pool:
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if charset is not None:
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warnings.warn(
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DeprecationWarning(
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'"charset" is deprecated. Use "encoding" instead'
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)
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)
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encoding = charset
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if errors is not None:
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warnings.warn(
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DeprecationWarning(
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'"errors" is deprecated. Use "encoding_errors" instead'
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)
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)
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encoding_errors = errors
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if not retry_on_error:
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retry_on_error = []
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if retry_on_timeout is True:
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retry_on_error.append(TimeoutError)
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kwargs = {
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"db": db,
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"username": username,
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"password": password,
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"socket_timeout": socket_timeout,
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"encoding": encoding,
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"encoding_errors": encoding_errors,
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"decode_responses": decode_responses,
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"retry_on_error": retry_on_error,
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"retry": copy.deepcopy(retry),
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"max_connections": max_connections,
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"health_check_interval": health_check_interval,
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"client_name": client_name,
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"lib_name": lib_name,
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"lib_version": lib_version,
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"redis_connect_func": redis_connect_func,
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"credential_provider": credential_provider,
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"protocol": protocol,
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}
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# based on input, setup appropriate connection args
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if unix_socket_path is not None:
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kwargs.update(
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{
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"path": unix_socket_path,
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"connection_class": UnixDomainSocketConnection,
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}
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)
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else:
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# TCP specific options
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kwargs.update(
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{
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"host": host,
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"port": port,
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"socket_connect_timeout": socket_connect_timeout,
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"socket_keepalive": socket_keepalive,
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"socket_keepalive_options": socket_keepalive_options,
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}
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)
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if ssl:
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kwargs.update(
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{
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"connection_class": SSLConnection,
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"ssl_keyfile": ssl_keyfile,
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"ssl_certfile": ssl_certfile,
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"ssl_cert_reqs": ssl_cert_reqs,
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"ssl_ca_certs": ssl_ca_certs,
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"ssl_ca_data": ssl_ca_data,
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"ssl_check_hostname": ssl_check_hostname,
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"ssl_password": ssl_password,
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"ssl_ca_path": ssl_ca_path,
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"ssl_validate_ocsp_stapled": ssl_validate_ocsp_stapled,
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"ssl_validate_ocsp": ssl_validate_ocsp,
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"ssl_ocsp_context": ssl_ocsp_context,
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"ssl_ocsp_expected_cert": ssl_ocsp_expected_cert,
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"ssl_min_version": ssl_min_version,
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"ssl_ciphers": ssl_ciphers,
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}
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)
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connection_pool = ConnectionPool(**kwargs)
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self.auto_close_connection_pool = True
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else:
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self.auto_close_connection_pool = False
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self.connection_pool = connection_pool
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self.connection = None
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if single_connection_client:
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self.connection = self.connection_pool.get_connection("_")
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self.response_callbacks = CaseInsensitiveDict(_RedisCallbacks)
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if self.connection_pool.connection_kwargs.get("protocol") in ["3", 3]:
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self.response_callbacks.update(_RedisCallbacksRESP3)
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else:
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self.response_callbacks.update(_RedisCallbacksRESP2)
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def __repr__(self) -> str:
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return (
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f"<{type(self).__module__}.{type(self).__name__}"
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f"({repr(self.connection_pool)})>"
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)
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def get_encoder(self) -> "Encoder":
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"""Get the connection pool's encoder"""
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return self.connection_pool.get_encoder()
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def get_connection_kwargs(self) -> Dict:
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"""Get the connection's key-word arguments"""
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return self.connection_pool.connection_kwargs
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def get_retry(self) -> Optional["Retry"]:
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return self.get_connection_kwargs().get("retry")
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def set_retry(self, retry: "Retry") -> None:
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self.get_connection_kwargs().update({"retry": retry})
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self.connection_pool.set_retry(retry)
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def set_response_callback(self, command: str, callback: Callable) -> None:
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"""Set a custom Response Callback"""
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self.response_callbacks[command] = callback
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def load_external_module(self, funcname, func) -> None:
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"""
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This function can be used to add externally defined redis modules,
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and their namespaces to the redis client.
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funcname - A string containing the name of the function to create
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func - The function, being added to this class.
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ex: Assume that one has a custom redis module named foomod that
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creates command named 'foo.dothing' and 'foo.anotherthing' in redis.
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To load function functions into this namespace:
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from redis import Redis
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from foomodule import F
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r = Redis()
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r.load_external_module("foo", F)
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r.foo().dothing('your', 'arguments')
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For a concrete example see the reimport of the redisjson module in
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tests/test_connection.py::test_loading_external_modules
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"""
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setattr(self, funcname, func)
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def pipeline(self, transaction=True, shard_hint=None) -> "Pipeline":
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"""
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Return a new pipeline object that can queue multiple commands for
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later execution. ``transaction`` indicates whether all commands
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should be executed atomically. Apart from making a group of operations
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atomic, pipelines are useful for reducing the back-and-forth overhead
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between the client and server.
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"""
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return Pipeline(
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self.connection_pool, self.response_callbacks, transaction, shard_hint
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)
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def transaction(
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self, func: Callable[["Pipeline"], None], *watches, **kwargs
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|
) -> None:
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"""
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|
Convenience method for executing the callable `func` as a transaction
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|
while watching all keys specified in `watches`. The 'func' callable
|
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should expect a single argument which is a Pipeline object.
|
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"""
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shard_hint = kwargs.pop("shard_hint", None)
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value_from_callable = kwargs.pop("value_from_callable", False)
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watch_delay = kwargs.pop("watch_delay", None)
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with self.pipeline(True, shard_hint) as pipe:
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while True:
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try:
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if watches:
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pipe.watch(*watches)
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func_value = func(pipe)
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exec_value = pipe.execute()
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return func_value if value_from_callable else exec_value
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except WatchError:
|
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if watch_delay is not None and watch_delay > 0:
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time.sleep(watch_delay)
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continue
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|
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def lock(
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self,
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name: str,
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timeout: Optional[float] = None,
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sleep: float = 0.1,
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blocking: bool = True,
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blocking_timeout: Optional[float] = None,
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lock_class: Union[None, Any] = None,
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thread_local: bool = True,
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):
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"""
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Return a new Lock object using key ``name`` that mimics
|
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the behavior of threading.Lock.
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|
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If specified, ``timeout`` indicates a maximum life for the lock.
|
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By default, it will remain locked until release() is called.
|
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|
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``sleep`` indicates the amount of time to sleep per loop iteration
|
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when the lock is in blocking mode and another client is currently
|
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holding the lock.
|
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|
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``blocking`` indicates whether calling ``acquire`` should block until
|
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the lock has been acquired or to fail immediately, causing ``acquire``
|
|
to return False and the lock not being acquired. Defaults to True.
|
|
Note this value can be overridden by passing a ``blocking``
|
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argument to ``acquire``.
|
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|
|
``blocking_timeout`` indicates the maximum amount of time in seconds to
|
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spend trying to acquire the lock. A value of ``None`` indicates
|
|
continue trying forever. ``blocking_timeout`` can be specified as a
|
|
float or integer, both representing the number of seconds to wait.
|
|
|
|
``lock_class`` forces the specified lock implementation. Note that as
|
|
of redis-py 3.0, the only lock class we implement is ``Lock`` (which is
|
|
a Lua-based lock). So, it's unlikely you'll need this parameter, unless
|
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you have created your own custom lock class.
|
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|
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``thread_local`` indicates whether the lock token is placed in
|
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thread-local storage. By default, the token is placed in thread local
|
|
storage so that a thread only sees its token, not a token set by
|
|
another thread. Consider the following timeline:
|
|
|
|
time: 0, thread-1 acquires `my-lock`, with a timeout of 5 seconds.
|
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thread-1 sets the token to "abc"
|
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time: 1, thread-2 blocks trying to acquire `my-lock` using the
|
|
Lock instance.
|
|
time: 5, thread-1 has not yet completed. redis expires the lock
|
|
key.
|
|
time: 5, thread-2 acquired `my-lock` now that it's available.
|
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thread-2 sets the token to "xyz"
|
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time: 6, thread-1 finishes its work and calls release(). if the
|
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token is *not* stored in thread local storage, then
|
|
thread-1 would see the token value as "xyz" and would be
|
|
able to successfully release the thread-2's lock.
|
|
|
|
In some use cases it's necessary to disable thread local storage. For
|
|
example, if you have code where one thread acquires a lock and passes
|
|
that lock instance to a worker thread to release later. If thread
|
|
local storage isn't disabled in this case, the worker thread won't see
|
|
the token set by the thread that acquired the lock. Our assumption
|
|
is that these cases aren't common and as such default to using
|
|
thread local storage."""
|
|
if lock_class is None:
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lock_class = Lock
|
|
return lock_class(
|
|
self,
|
|
name,
|
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timeout=timeout,
|
|
sleep=sleep,
|
|
blocking=blocking,
|
|
blocking_timeout=blocking_timeout,
|
|
thread_local=thread_local,
|
|
)
|
|
|
|
def pubsub(self, **kwargs):
|
|
"""
|
|
Return a Publish/Subscribe object. With this object, you can
|
|
subscribe to channels and listen for messages that get published to
|
|
them.
|
|
"""
|
|
return PubSub(self.connection_pool, **kwargs)
|
|
|
|
def monitor(self):
|
|
return Monitor(self.connection_pool)
|
|
|
|
def client(self):
|
|
return self.__class__(
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connection_pool=self.connection_pool, single_connection_client=True
|
|
)
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc_value, traceback):
|
|
self.close()
|
|
|
|
def __del__(self):
|
|
self.close()
|
|
|
|
def close(self):
|
|
# In case a connection property does not yet exist
|
|
# (due to a crash earlier in the Redis() constructor), return
|
|
# immediately as there is nothing to clean-up.
|
|
if not hasattr(self, "connection"):
|
|
return
|
|
|
|
conn = self.connection
|
|
if conn:
|
|
self.connection = None
|
|
self.connection_pool.release(conn)
|
|
|
|
if self.auto_close_connection_pool:
|
|
self.connection_pool.disconnect()
|
|
|
|
def _send_command_parse_response(self, conn, command_name, *args, **options):
|
|
"""
|
|
Send a command and parse the response
|
|
"""
|
|
conn.send_command(*args)
|
|
return self.parse_response(conn, command_name, **options)
|
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|
|
def _disconnect_raise(self, conn, error):
|
|
"""
|
|
Close the connection and raise an exception
|
|
if retry_on_error is not set or the error
|
|
is not one of the specified error types
|
|
"""
|
|
conn.disconnect()
|
|
if (
|
|
conn.retry_on_error is None
|
|
or isinstance(error, tuple(conn.retry_on_error)) is False
|
|
):
|
|
raise error
|
|
|
|
# COMMAND EXECUTION AND PROTOCOL PARSING
|
|
def execute_command(self, *args, **options):
|
|
"""Execute a command and return a parsed response"""
|
|
pool = self.connection_pool
|
|
command_name = args[0]
|
|
conn = self.connection or pool.get_connection(command_name, **options)
|
|
|
|
try:
|
|
return conn.retry.call_with_retry(
|
|
lambda: self._send_command_parse_response(
|
|
conn, command_name, *args, **options
|
|
),
|
|
lambda error: self._disconnect_raise(conn, error),
|
|
)
|
|
finally:
|
|
if not self.connection:
|
|
pool.release(conn)
|
|
|
|
def parse_response(self, connection, command_name, **options):
|
|
"""Parses a response from the Redis server"""
|
|
try:
|
|
if NEVER_DECODE in options:
|
|
response = connection.read_response(disable_decoding=True)
|
|
options.pop(NEVER_DECODE)
|
|
else:
|
|
response = connection.read_response()
|
|
except ResponseError:
|
|
if EMPTY_RESPONSE in options:
|
|
return options[EMPTY_RESPONSE]
|
|
raise
|
|
|
|
if EMPTY_RESPONSE in options:
|
|
options.pop(EMPTY_RESPONSE)
|
|
|
|
if command_name in self.response_callbacks:
|
|
return self.response_callbacks[command_name](response, **options)
|
|
return response
|
|
|
|
|
|
StrictRedis = Redis
|
|
|
|
|
|
class Monitor:
|
|
"""
|
|
Monitor is useful for handling the MONITOR command to the redis server.
|
|
next_command() method returns one command from monitor
|
|
listen() method yields commands from monitor.
|
|
"""
|
|
|
|
monitor_re = re.compile(r"\[(\d+) (.*?)\] (.*)")
|
|
command_re = re.compile(r'"(.*?)(?<!\\)"')
|
|
|
|
def __init__(self, connection_pool):
|
|
self.connection_pool = connection_pool
|
|
self.connection = self.connection_pool.get_connection("MONITOR")
|
|
|
|
def __enter__(self):
|
|
self.connection.send_command("MONITOR")
|
|
# check that monitor returns 'OK', but don't return it to user
|
|
response = self.connection.read_response()
|
|
if not bool_ok(response):
|
|
raise RedisError(f"MONITOR failed: {response}")
|
|
return self
|
|
|
|
def __exit__(self, *args):
|
|
self.connection.disconnect()
|
|
self.connection_pool.release(self.connection)
|
|
|
|
def next_command(self):
|
|
"""Parse the response from a monitor command"""
|
|
response = self.connection.read_response()
|
|
if isinstance(response, bytes):
|
|
response = self.connection.encoder.decode(response, force=True)
|
|
command_time, command_data = response.split(" ", 1)
|
|
m = self.monitor_re.match(command_data)
|
|
db_id, client_info, command = m.groups()
|
|
command = " ".join(self.command_re.findall(command))
|
|
# Redis escapes double quotes because each piece of the command
|
|
# string is surrounded by double quotes. We don't have that
|
|
# requirement so remove the escaping and leave the quote.
|
|
command = command.replace('\\"', '"')
|
|
|
|
if client_info == "lua":
|
|
client_address = "lua"
|
|
client_port = ""
|
|
client_type = "lua"
|
|
elif client_info.startswith("unix"):
|
|
client_address = "unix"
|
|
client_port = client_info[5:]
|
|
client_type = "unix"
|
|
else:
|
|
# use rsplit as ipv6 addresses contain colons
|
|
client_address, client_port = client_info.rsplit(":", 1)
|
|
client_type = "tcp"
|
|
return {
|
|
"time": float(command_time),
|
|
"db": int(db_id),
|
|
"client_address": client_address,
|
|
"client_port": client_port,
|
|
"client_type": client_type,
|
|
"command": command,
|
|
}
|
|
|
|
def listen(self):
|
|
"""Listen for commands coming to the server."""
|
|
while True:
|
|
yield self.next_command()
|
|
|
|
|
|
class PubSub:
|
|
"""
|
|
PubSub provides publish, subscribe and listen support to Redis channels.
|
|
|
|
After subscribing to one or more channels, the listen() method will block
|
|
until a message arrives on one of the subscribed channels. That message
|
|
will be returned and it's safe to start listening again.
|
|
"""
|
|
|
|
PUBLISH_MESSAGE_TYPES = ("message", "pmessage", "smessage")
|
|
UNSUBSCRIBE_MESSAGE_TYPES = ("unsubscribe", "punsubscribe", "sunsubscribe")
|
|
HEALTH_CHECK_MESSAGE = "redis-py-health-check"
|
|
|
|
def __init__(
|
|
self,
|
|
connection_pool,
|
|
shard_hint=None,
|
|
ignore_subscribe_messages: bool = False,
|
|
encoder: Optional["Encoder"] = None,
|
|
push_handler_func: Union[None, Callable[[str], None]] = None,
|
|
):
|
|
self.connection_pool = connection_pool
|
|
self.shard_hint = shard_hint
|
|
self.ignore_subscribe_messages = ignore_subscribe_messages
|
|
self.connection = None
|
|
self.subscribed_event = threading.Event()
|
|
# we need to know the encoding options for this connection in order
|
|
# to lookup channel and pattern names for callback handlers.
|
|
self.encoder = encoder
|
|
self.push_handler_func = push_handler_func
|
|
if self.encoder is None:
|
|
self.encoder = self.connection_pool.get_encoder()
|
|
self.health_check_response_b = self.encoder.encode(self.HEALTH_CHECK_MESSAGE)
|
|
if self.encoder.decode_responses:
|
|
self.health_check_response = ["pong", self.HEALTH_CHECK_MESSAGE]
|
|
else:
|
|
self.health_check_response = [b"pong", self.health_check_response_b]
|
|
if self.push_handler_func is None:
|
|
_set_info_logger()
|
|
self.reset()
|
|
|
|
def __enter__(self) -> "PubSub":
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc_value, traceback) -> None:
|
|
self.reset()
|
|
|
|
def __del__(self) -> None:
|
|
try:
|
|
# if this object went out of scope prior to shutting down
|
|
# subscriptions, close the connection manually before
|
|
# returning it to the connection pool
|
|
self.reset()
|
|
except Exception:
|
|
pass
|
|
|
|
def reset(self) -> None:
|
|
if self.connection:
|
|
self.connection.disconnect()
|
|
self.connection.deregister_connect_callback(self.on_connect)
|
|
self.connection_pool.release(self.connection)
|
|
self.connection = None
|
|
self.health_check_response_counter = 0
|
|
self.channels = {}
|
|
self.pending_unsubscribe_channels = set()
|
|
self.shard_channels = {}
|
|
self.pending_unsubscribe_shard_channels = set()
|
|
self.patterns = {}
|
|
self.pending_unsubscribe_patterns = set()
|
|
self.subscribed_event.clear()
|
|
|
|
def close(self) -> None:
|
|
self.reset()
|
|
|
|
def on_connect(self, connection) -> None:
|
|
"Re-subscribe to any channels and patterns previously subscribed to"
|
|
# NOTE: for python3, we can't pass bytestrings as keyword arguments
|
|
# so we need to decode channel/pattern names back to unicode strings
|
|
# before passing them to [p]subscribe.
|
|
self.pending_unsubscribe_channels.clear()
|
|
self.pending_unsubscribe_patterns.clear()
|
|
self.pending_unsubscribe_shard_channels.clear()
|
|
if self.channels:
|
|
channels = {
|
|
self.encoder.decode(k, force=True): v for k, v in self.channels.items()
|
|
}
|
|
self.subscribe(**channels)
|
|
if self.patterns:
|
|
patterns = {
|
|
self.encoder.decode(k, force=True): v for k, v in self.patterns.items()
|
|
}
|
|
self.psubscribe(**patterns)
|
|
if self.shard_channels:
|
|
shard_channels = {
|
|
self.encoder.decode(k, force=True): v
|
|
for k, v in self.shard_channels.items()
|
|
}
|
|
self.ssubscribe(**shard_channels)
|
|
|
|
@property
|
|
def subscribed(self) -> bool:
|
|
"""Indicates if there are subscriptions to any channels or patterns"""
|
|
return self.subscribed_event.is_set()
|
|
|
|
def execute_command(self, *args):
|
|
"""Execute a publish/subscribe command"""
|
|
|
|
# NOTE: don't parse the response in this function -- it could pull a
|
|
# legitimate message off the stack if the connection is already
|
|
# subscribed to one or more channels
|
|
|
|
if self.connection is None:
|
|
self.connection = self.connection_pool.get_connection(
|
|
"pubsub", self.shard_hint
|
|
)
|
|
# register a callback that re-subscribes to any channels we
|
|
# were listening to when we were disconnected
|
|
self.connection.register_connect_callback(self.on_connect)
|
|
if self.push_handler_func is not None and not HIREDIS_AVAILABLE:
|
|
self.connection._parser.set_push_handler(self.push_handler_func)
|
|
connection = self.connection
|
|
kwargs = {"check_health": not self.subscribed}
|
|
if not self.subscribed:
|
|
self.clean_health_check_responses()
|
|
self._execute(connection, connection.send_command, *args, **kwargs)
|
|
|
|
def clean_health_check_responses(self) -> None:
|
|
"""
|
|
If any health check responses are present, clean them
|
|
"""
|
|
ttl = 10
|
|
conn = self.connection
|
|
while self.health_check_response_counter > 0 and ttl > 0:
|
|
if self._execute(conn, conn.can_read, timeout=conn.socket_timeout):
|
|
response = self._execute(conn, conn.read_response)
|
|
if self.is_health_check_response(response):
|
|
self.health_check_response_counter -= 1
|
|
else:
|
|
raise PubSubError(
|
|
"A non health check response was cleaned by "
|
|
"execute_command: {0}".format(response)
|
|
)
|
|
ttl -= 1
|
|
|
|
def _disconnect_raise_connect(self, conn, error) -> None:
|
|
"""
|
|
Close the connection and raise an exception
|
|
if retry_on_error is not set or the error is not one
|
|
of the specified error types. Otherwise, try to
|
|
reconnect
|
|
"""
|
|
conn.disconnect()
|
|
if (
|
|
conn.retry_on_error is None
|
|
or isinstance(error, tuple(conn.retry_on_error)) is False
|
|
):
|
|
raise error
|
|
conn.connect()
|
|
|
|
def _execute(self, conn, command, *args, **kwargs):
|
|
"""
|
|
Connect manually upon disconnection. If the Redis server is down,
|
|
this will fail and raise a ConnectionError as desired.
|
|
After reconnection, the ``on_connect`` callback should have been
|
|
called by the # connection to resubscribe us to any channels and
|
|
patterns we were previously listening to
|
|
"""
|
|
return conn.retry.call_with_retry(
|
|
lambda: command(*args, **kwargs),
|
|
lambda error: self._disconnect_raise_connect(conn, error),
|
|
)
|
|
|
|
def parse_response(self, block=True, timeout=0):
|
|
"""Parse the response from a publish/subscribe command"""
|
|
conn = self.connection
|
|
if conn is None:
|
|
raise RuntimeError(
|
|
"pubsub connection not set: "
|
|
"did you forget to call subscribe() or psubscribe()?"
|
|
)
|
|
|
|
self.check_health()
|
|
|
|
def try_read():
|
|
if not block:
|
|
if not conn.can_read(timeout=timeout):
|
|
return None
|
|
else:
|
|
conn.connect()
|
|
return conn.read_response(disconnect_on_error=False, push_request=True)
|
|
|
|
response = self._execute(conn, try_read)
|
|
|
|
if self.is_health_check_response(response):
|
|
# ignore the health check message as user might not expect it
|
|
self.health_check_response_counter -= 1
|
|
return None
|
|
return response
|
|
|
|
def is_health_check_response(self, response) -> bool:
|
|
"""
|
|
Check if the response is a health check response.
|
|
If there are no subscriptions redis responds to PING command with a
|
|
bulk response, instead of a multi-bulk with "pong" and the response.
|
|
"""
|
|
return response in [
|
|
self.health_check_response, # If there was a subscription
|
|
self.health_check_response_b, # If there wasn't
|
|
]
|
|
|
|
def check_health(self) -> None:
|
|
conn = self.connection
|
|
if conn is None:
|
|
raise RuntimeError(
|
|
"pubsub connection not set: "
|
|
"did you forget to call subscribe() or psubscribe()?"
|
|
)
|
|
|
|
if conn.health_check_interval and time.time() > conn.next_health_check:
|
|
conn.send_command("PING", self.HEALTH_CHECK_MESSAGE, check_health=False)
|
|
self.health_check_response_counter += 1
|
|
|
|
def _normalize_keys(self, data) -> Dict:
|
|
"""
|
|
normalize channel/pattern names to be either bytes or strings
|
|
based on whether responses are automatically decoded. this saves us
|
|
from coercing the value for each message coming in.
|
|
"""
|
|
encode = self.encoder.encode
|
|
decode = self.encoder.decode
|
|
return {decode(encode(k)): v for k, v in data.items()}
|
|
|
|
def psubscribe(self, *args, **kwargs):
|
|
"""
|
|
Subscribe to channel patterns. Patterns supplied as keyword arguments
|
|
expect a pattern name as the key and a callable as the value. A
|
|
pattern's callable will be invoked automatically when a message is
|
|
received on that pattern rather than producing a message via
|
|
``listen()``.
|
|
"""
|
|
if args:
|
|
args = list_or_args(args[0], args[1:])
|
|
new_patterns = dict.fromkeys(args)
|
|
new_patterns.update(kwargs)
|
|
ret_val = self.execute_command("PSUBSCRIBE", *new_patterns.keys())
|
|
# update the patterns dict AFTER we send the command. we don't want to
|
|
# subscribe twice to these patterns, once for the command and again
|
|
# for the reconnection.
|
|
new_patterns = self._normalize_keys(new_patterns)
|
|
self.patterns.update(new_patterns)
|
|
if not self.subscribed:
|
|
# Set the subscribed_event flag to True
|
|
self.subscribed_event.set()
|
|
# Clear the health check counter
|
|
self.health_check_response_counter = 0
|
|
self.pending_unsubscribe_patterns.difference_update(new_patterns)
|
|
return ret_val
|
|
|
|
def punsubscribe(self, *args):
|
|
"""
|
|
Unsubscribe from the supplied patterns. If empty, unsubscribe from
|
|
all patterns.
|
|
"""
|
|
if args:
|
|
args = list_or_args(args[0], args[1:])
|
|
patterns = self._normalize_keys(dict.fromkeys(args))
|
|
else:
|
|
patterns = self.patterns
|
|
self.pending_unsubscribe_patterns.update(patterns)
|
|
return self.execute_command("PUNSUBSCRIBE", *args)
|
|
|
|
def subscribe(self, *args, **kwargs):
|
|
"""
|
|
Subscribe to channels. Channels supplied as keyword arguments expect
|
|
a channel name as the key and a callable as the value. A channel's
|
|
callable will be invoked automatically when a message is received on
|
|
that channel rather than producing a message via ``listen()`` or
|
|
``get_message()``.
|
|
"""
|
|
if args:
|
|
args = list_or_args(args[0], args[1:])
|
|
new_channels = dict.fromkeys(args)
|
|
new_channels.update(kwargs)
|
|
ret_val = self.execute_command("SUBSCRIBE", *new_channels.keys())
|
|
# update the channels dict AFTER we send the command. we don't want to
|
|
# subscribe twice to these channels, once for the command and again
|
|
# for the reconnection.
|
|
new_channels = self._normalize_keys(new_channels)
|
|
self.channels.update(new_channels)
|
|
if not self.subscribed:
|
|
# Set the subscribed_event flag to True
|
|
self.subscribed_event.set()
|
|
# Clear the health check counter
|
|
self.health_check_response_counter = 0
|
|
self.pending_unsubscribe_channels.difference_update(new_channels)
|
|
return ret_val
|
|
|
|
def unsubscribe(self, *args):
|
|
"""
|
|
Unsubscribe from the supplied channels. If empty, unsubscribe from
|
|
all channels
|
|
"""
|
|
if args:
|
|
args = list_or_args(args[0], args[1:])
|
|
channels = self._normalize_keys(dict.fromkeys(args))
|
|
else:
|
|
channels = self.channels
|
|
self.pending_unsubscribe_channels.update(channels)
|
|
return self.execute_command("UNSUBSCRIBE", *args)
|
|
|
|
def ssubscribe(self, *args, target_node=None, **kwargs):
|
|
"""
|
|
Subscribes the client to the specified shard channels.
|
|
Channels supplied as keyword arguments expect a channel name as the key
|
|
and a callable as the value. A channel's callable will be invoked automatically
|
|
when a message is received on that channel rather than producing a message via
|
|
``listen()`` or ``get_sharded_message()``.
|
|
"""
|
|
if args:
|
|
args = list_or_args(args[0], args[1:])
|
|
new_s_channels = dict.fromkeys(args)
|
|
new_s_channels.update(kwargs)
|
|
ret_val = self.execute_command("SSUBSCRIBE", *new_s_channels.keys())
|
|
# update the s_channels dict AFTER we send the command. we don't want to
|
|
# subscribe twice to these channels, once for the command and again
|
|
# for the reconnection.
|
|
new_s_channels = self._normalize_keys(new_s_channels)
|
|
self.shard_channels.update(new_s_channels)
|
|
if not self.subscribed:
|
|
# Set the subscribed_event flag to True
|
|
self.subscribed_event.set()
|
|
# Clear the health check counter
|
|
self.health_check_response_counter = 0
|
|
self.pending_unsubscribe_shard_channels.difference_update(new_s_channels)
|
|
return ret_val
|
|
|
|
def sunsubscribe(self, *args, target_node=None):
|
|
"""
|
|
Unsubscribe from the supplied shard_channels. If empty, unsubscribe from
|
|
all shard_channels
|
|
"""
|
|
if args:
|
|
args = list_or_args(args[0], args[1:])
|
|
s_channels = self._normalize_keys(dict.fromkeys(args))
|
|
else:
|
|
s_channels = self.shard_channels
|
|
self.pending_unsubscribe_shard_channels.update(s_channels)
|
|
return self.execute_command("SUNSUBSCRIBE", *args)
|
|
|
|
def listen(self):
|
|
"Listen for messages on channels this client has been subscribed to"
|
|
while self.subscribed:
|
|
response = self.handle_message(self.parse_response(block=True))
|
|
if response is not None:
|
|
yield response
|
|
|
|
def get_message(
|
|
self, ignore_subscribe_messages: bool = False, timeout: float = 0.0
|
|
):
|
|
"""
|
|
Get the next message if one is available, otherwise None.
|
|
|
|
If timeout is specified, the system will wait for `timeout` seconds
|
|
before returning. Timeout should be specified as a floating point
|
|
number, or None, to wait indefinitely.
|
|
"""
|
|
if not self.subscribed:
|
|
# Wait for subscription
|
|
start_time = time.time()
|
|
if self.subscribed_event.wait(timeout) is True:
|
|
# The connection was subscribed during the timeout time frame.
|
|
# The timeout should be adjusted based on the time spent
|
|
# waiting for the subscription
|
|
time_spent = time.time() - start_time
|
|
timeout = max(0.0, timeout - time_spent)
|
|
else:
|
|
# The connection isn't subscribed to any channels or patterns,
|
|
# so no messages are available
|
|
return None
|
|
|
|
response = self.parse_response(block=(timeout is None), timeout=timeout)
|
|
if response:
|
|
return self.handle_message(response, ignore_subscribe_messages)
|
|
return None
|
|
|
|
get_sharded_message = get_message
|
|
|
|
def ping(self, message: Union[str, None] = None) -> bool:
|
|
"""
|
|
Ping the Redis server
|
|
"""
|
|
args = ["PING", message] if message is not None else ["PING"]
|
|
return self.execute_command(*args)
|
|
|
|
def handle_message(self, response, ignore_subscribe_messages=False):
|
|
"""
|
|
Parses a pub/sub message. If the channel or pattern was subscribed to
|
|
with a message handler, the handler is invoked instead of a parsed
|
|
message being returned.
|
|
"""
|
|
if response is None:
|
|
return None
|
|
if isinstance(response, bytes):
|
|
response = [b"pong", response] if response != b"PONG" else [b"pong", b""]
|
|
message_type = str_if_bytes(response[0])
|
|
if message_type == "pmessage":
|
|
message = {
|
|
"type": message_type,
|
|
"pattern": response[1],
|
|
"channel": response[2],
|
|
"data": response[3],
|
|
}
|
|
elif message_type == "pong":
|
|
message = {
|
|
"type": message_type,
|
|
"pattern": None,
|
|
"channel": None,
|
|
"data": response[1],
|
|
}
|
|
else:
|
|
message = {
|
|
"type": message_type,
|
|
"pattern": None,
|
|
"channel": response[1],
|
|
"data": response[2],
|
|
}
|
|
|
|
# if this is an unsubscribe message, remove it from memory
|
|
if message_type in self.UNSUBSCRIBE_MESSAGE_TYPES:
|
|
if message_type == "punsubscribe":
|
|
pattern = response[1]
|
|
if pattern in self.pending_unsubscribe_patterns:
|
|
self.pending_unsubscribe_patterns.remove(pattern)
|
|
self.patterns.pop(pattern, None)
|
|
elif message_type == "sunsubscribe":
|
|
s_channel = response[1]
|
|
if s_channel in self.pending_unsubscribe_shard_channels:
|
|
self.pending_unsubscribe_shard_channels.remove(s_channel)
|
|
self.shard_channels.pop(s_channel, None)
|
|
else:
|
|
channel = response[1]
|
|
if channel in self.pending_unsubscribe_channels:
|
|
self.pending_unsubscribe_channels.remove(channel)
|
|
self.channels.pop(channel, None)
|
|
if not self.channels and not self.patterns and not self.shard_channels:
|
|
# There are no subscriptions anymore, set subscribed_event flag
|
|
# to false
|
|
self.subscribed_event.clear()
|
|
|
|
if message_type in self.PUBLISH_MESSAGE_TYPES:
|
|
# if there's a message handler, invoke it
|
|
if message_type == "pmessage":
|
|
handler = self.patterns.get(message["pattern"], None)
|
|
elif message_type == "smessage":
|
|
handler = self.shard_channels.get(message["channel"], None)
|
|
else:
|
|
handler = self.channels.get(message["channel"], None)
|
|
if handler:
|
|
handler(message)
|
|
return None
|
|
elif message_type != "pong":
|
|
# this is a subscribe/unsubscribe message. ignore if we don't
|
|
# want them
|
|
if ignore_subscribe_messages or self.ignore_subscribe_messages:
|
|
return None
|
|
|
|
return message
|
|
|
|
def run_in_thread(
|
|
self,
|
|
sleep_time: float = 0.0,
|
|
daemon: bool = False,
|
|
exception_handler: Optional[Callable] = None,
|
|
) -> "PubSubWorkerThread":
|
|
for channel, handler in self.channels.items():
|
|
if handler is None:
|
|
raise PubSubError(f"Channel: '{channel}' has no handler registered")
|
|
for pattern, handler in self.patterns.items():
|
|
if handler is None:
|
|
raise PubSubError(f"Pattern: '{pattern}' has no handler registered")
|
|
for s_channel, handler in self.shard_channels.items():
|
|
if handler is None:
|
|
raise PubSubError(
|
|
f"Shard Channel: '{s_channel}' has no handler registered"
|
|
)
|
|
|
|
thread = PubSubWorkerThread(
|
|
self, sleep_time, daemon=daemon, exception_handler=exception_handler
|
|
)
|
|
thread.start()
|
|
return thread
|
|
|
|
|
|
class PubSubWorkerThread(threading.Thread):
|
|
def __init__(
|
|
self,
|
|
pubsub,
|
|
sleep_time: float,
|
|
daemon: bool = False,
|
|
exception_handler: Union[
|
|
Callable[[Exception, "PubSub", "PubSubWorkerThread"], None], None
|
|
] = None,
|
|
):
|
|
super().__init__()
|
|
self.daemon = daemon
|
|
self.pubsub = pubsub
|
|
self.sleep_time = sleep_time
|
|
self.exception_handler = exception_handler
|
|
self._running = threading.Event()
|
|
|
|
def run(self) -> None:
|
|
if self._running.is_set():
|
|
return
|
|
self._running.set()
|
|
pubsub = self.pubsub
|
|
sleep_time = self.sleep_time
|
|
while self._running.is_set():
|
|
try:
|
|
pubsub.get_message(ignore_subscribe_messages=True, timeout=sleep_time)
|
|
except BaseException as e:
|
|
if self.exception_handler is None:
|
|
raise
|
|
self.exception_handler(e, pubsub, self)
|
|
pubsub.close()
|
|
|
|
def stop(self) -> None:
|
|
# trip the flag so the run loop exits. the run loop will
|
|
# close the pubsub connection, which disconnects the socket
|
|
# and returns the connection to the pool.
|
|
self._running.clear()
|
|
|
|
|
|
class Pipeline(Redis):
|
|
"""
|
|
Pipelines provide a way to transmit multiple commands to the Redis server
|
|
in one transmission. This is convenient for batch processing, such as
|
|
saving all the values in a list to Redis.
|
|
|
|
All commands executed within a pipeline are wrapped with MULTI and EXEC
|
|
calls. This guarantees all commands executed in the pipeline will be
|
|
executed atomically.
|
|
|
|
Any command raising an exception does *not* halt the execution of
|
|
subsequent commands in the pipeline. Instead, the exception is caught
|
|
and its instance is placed into the response list returned by execute().
|
|
Code iterating over the response list should be able to deal with an
|
|
instance of an exception as a potential value. In general, these will be
|
|
ResponseError exceptions, such as those raised when issuing a command
|
|
on a key of a different datatype.
|
|
"""
|
|
|
|
UNWATCH_COMMANDS = {"DISCARD", "EXEC", "UNWATCH"}
|
|
|
|
def __init__(self, connection_pool, response_callbacks, transaction, shard_hint):
|
|
self.connection_pool = connection_pool
|
|
self.connection = None
|
|
self.response_callbacks = response_callbacks
|
|
self.transaction = transaction
|
|
self.shard_hint = shard_hint
|
|
|
|
self.watching = False
|
|
self.reset()
|
|
|
|
def __enter__(self) -> "Pipeline":
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc_value, traceback):
|
|
self.reset()
|
|
|
|
def __del__(self):
|
|
try:
|
|
self.reset()
|
|
except Exception:
|
|
pass
|
|
|
|
def __len__(self) -> int:
|
|
return len(self.command_stack)
|
|
|
|
def __bool__(self) -> bool:
|
|
"""Pipeline instances should always evaluate to True"""
|
|
return True
|
|
|
|
def reset(self) -> None:
|
|
self.command_stack = []
|
|
self.scripts = set()
|
|
# make sure to reset the connection state in the event that we were
|
|
# watching something
|
|
if self.watching and self.connection:
|
|
try:
|
|
# call this manually since our unwatch or
|
|
# immediate_execute_command methods can call reset()
|
|
self.connection.send_command("UNWATCH")
|
|
self.connection.read_response()
|
|
except ConnectionError:
|
|
# disconnect will also remove any previous WATCHes
|
|
self.connection.disconnect()
|
|
# clean up the other instance attributes
|
|
self.watching = False
|
|
self.explicit_transaction = False
|
|
# we can safely return the connection to the pool here since we're
|
|
# sure we're no longer WATCHing anything
|
|
if self.connection:
|
|
self.connection_pool.release(self.connection)
|
|
self.connection = None
|
|
|
|
def close(self) -> None:
|
|
"""Close the pipeline"""
|
|
self.reset()
|
|
|
|
def multi(self) -> None:
|
|
"""
|
|
Start a transactional block of the pipeline after WATCH commands
|
|
are issued. End the transactional block with `execute`.
|
|
"""
|
|
if self.explicit_transaction:
|
|
raise RedisError("Cannot issue nested calls to MULTI")
|
|
if self.command_stack:
|
|
raise RedisError(
|
|
"Commands without an initial WATCH have already been issued"
|
|
)
|
|
self.explicit_transaction = True
|
|
|
|
def execute_command(self, *args, **kwargs):
|
|
if (self.watching or args[0] == "WATCH") and not self.explicit_transaction:
|
|
return self.immediate_execute_command(*args, **kwargs)
|
|
return self.pipeline_execute_command(*args, **kwargs)
|
|
|
|
def _disconnect_reset_raise(self, conn, error) -> None:
|
|
"""
|
|
Close the connection, reset watching state and
|
|
raise an exception if we were watching,
|
|
if retry_on_error is not set or the error is not one
|
|
of the specified error types.
|
|
"""
|
|
conn.disconnect()
|
|
# if we were already watching a variable, the watch is no longer
|
|
# valid since this connection has died. raise a WatchError, which
|
|
# indicates the user should retry this transaction.
|
|
if self.watching:
|
|
self.reset()
|
|
raise WatchError(
|
|
"A ConnectionError occurred on while watching one or more keys"
|
|
)
|
|
# if retry_on_error is not set or the error is not one
|
|
# of the specified error types, raise it
|
|
if (
|
|
conn.retry_on_error is None
|
|
or isinstance(error, tuple(conn.retry_on_error)) is False
|
|
):
|
|
self.reset()
|
|
raise
|
|
|
|
def immediate_execute_command(self, *args, **options):
|
|
"""
|
|
Execute a command immediately, but don't auto-retry on a
|
|
ConnectionError if we're already WATCHing a variable. Used when
|
|
issuing WATCH or subsequent commands retrieving their values but before
|
|
MULTI is called.
|
|
"""
|
|
command_name = args[0]
|
|
conn = self.connection
|
|
# if this is the first call, we need a connection
|
|
if not conn:
|
|
conn = self.connection_pool.get_connection(command_name, self.shard_hint)
|
|
self.connection = conn
|
|
|
|
return conn.retry.call_with_retry(
|
|
lambda: self._send_command_parse_response(
|
|
conn, command_name, *args, **options
|
|
),
|
|
lambda error: self._disconnect_reset_raise(conn, error),
|
|
)
|
|
|
|
def pipeline_execute_command(self, *args, **options) -> "Pipeline":
|
|
"""
|
|
Stage a command to be executed when execute() is next called
|
|
|
|
Returns the current Pipeline object back so commands can be
|
|
chained together, such as:
|
|
|
|
pipe = pipe.set('foo', 'bar').incr('baz').decr('bang')
|
|
|
|
At some other point, you can then run: pipe.execute(),
|
|
which will execute all commands queued in the pipe.
|
|
"""
|
|
self.command_stack.append((args, options))
|
|
return self
|
|
|
|
def _execute_transaction(self, connection, commands, raise_on_error) -> List:
|
|
cmds = chain([(("MULTI",), {})], commands, [(("EXEC",), {})])
|
|
all_cmds = connection.pack_commands(
|
|
[args for args, options in cmds if EMPTY_RESPONSE not in options]
|
|
)
|
|
connection.send_packed_command(all_cmds)
|
|
errors = []
|
|
|
|
# parse off the response for MULTI
|
|
# NOTE: we need to handle ResponseErrors here and continue
|
|
# so that we read all the additional command messages from
|
|
# the socket
|
|
try:
|
|
self.parse_response(connection, "_")
|
|
except ResponseError as e:
|
|
errors.append((0, e))
|
|
|
|
# and all the other commands
|
|
for i, command in enumerate(commands):
|
|
if EMPTY_RESPONSE in command[1]:
|
|
errors.append((i, command[1][EMPTY_RESPONSE]))
|
|
else:
|
|
try:
|
|
self.parse_response(connection, "_")
|
|
except ResponseError as e:
|
|
self.annotate_exception(e, i + 1, command[0])
|
|
errors.append((i, e))
|
|
|
|
# parse the EXEC.
|
|
try:
|
|
response = self.parse_response(connection, "_")
|
|
except ExecAbortError:
|
|
if errors:
|
|
raise errors[0][1]
|
|
raise
|
|
|
|
# EXEC clears any watched keys
|
|
self.watching = False
|
|
|
|
if response is None:
|
|
raise WatchError("Watched variable changed.")
|
|
|
|
# put any parse errors into the response
|
|
for i, e in errors:
|
|
response.insert(i, e)
|
|
|
|
if len(response) != len(commands):
|
|
self.connection.disconnect()
|
|
raise ResponseError(
|
|
"Wrong number of response items from pipeline execution"
|
|
)
|
|
|
|
# find any errors in the response and raise if necessary
|
|
if raise_on_error:
|
|
self.raise_first_error(commands, response)
|
|
|
|
# We have to run response callbacks manually
|
|
data = []
|
|
for r, cmd in zip(response, commands):
|
|
if not isinstance(r, Exception):
|
|
args, options = cmd
|
|
command_name = args[0]
|
|
if command_name in self.response_callbacks:
|
|
r = self.response_callbacks[command_name](r, **options)
|
|
data.append(r)
|
|
return data
|
|
|
|
def _execute_pipeline(self, connection, commands, raise_on_error):
|
|
# build up all commands into a single request to increase network perf
|
|
all_cmds = connection.pack_commands([args for args, _ in commands])
|
|
connection.send_packed_command(all_cmds)
|
|
|
|
response = []
|
|
for args, options in commands:
|
|
try:
|
|
response.append(self.parse_response(connection, args[0], **options))
|
|
except ResponseError as e:
|
|
response.append(e)
|
|
|
|
if raise_on_error:
|
|
self.raise_first_error(commands, response)
|
|
return response
|
|
|
|
def raise_first_error(self, commands, response):
|
|
for i, r in enumerate(response):
|
|
if isinstance(r, ResponseError):
|
|
self.annotate_exception(r, i + 1, commands[i][0])
|
|
raise r
|
|
|
|
def annotate_exception(self, exception, number, command):
|
|
cmd = " ".join(map(safe_str, command))
|
|
msg = (
|
|
f"Command # {number} ({cmd}) of pipeline "
|
|
f"caused error: {exception.args[0]}"
|
|
)
|
|
exception.args = (msg,) + exception.args[1:]
|
|
|
|
def parse_response(self, connection, command_name, **options):
|
|
result = Redis.parse_response(self, connection, command_name, **options)
|
|
if command_name in self.UNWATCH_COMMANDS:
|
|
self.watching = False
|
|
elif command_name == "WATCH":
|
|
self.watching = True
|
|
return result
|
|
|
|
def load_scripts(self):
|
|
# make sure all scripts that are about to be run on this pipeline exist
|
|
scripts = list(self.scripts)
|
|
immediate = self.immediate_execute_command
|
|
shas = [s.sha for s in scripts]
|
|
# we can't use the normal script_* methods because they would just
|
|
# get buffered in the pipeline.
|
|
exists = immediate("SCRIPT EXISTS", *shas)
|
|
if not all(exists):
|
|
for s, exist in zip(scripts, exists):
|
|
if not exist:
|
|
s.sha = immediate("SCRIPT LOAD", s.script)
|
|
|
|
def _disconnect_raise_reset(
|
|
self,
|
|
conn: AbstractConnection,
|
|
error: Exception,
|
|
) -> None:
|
|
"""
|
|
Close the connection, raise an exception if we were watching,
|
|
and raise an exception if retry_on_error is not set or the
|
|
error is not one of the specified error types.
|
|
"""
|
|
conn.disconnect()
|
|
# if we were watching a variable, the watch is no longer valid
|
|
# since this connection has died. raise a WatchError, which
|
|
# indicates the user should retry this transaction.
|
|
if self.watching:
|
|
raise WatchError(
|
|
"A ConnectionError occurred on while watching one or more keys"
|
|
)
|
|
# if retry_on_error is not set or the error is not one
|
|
# of the specified error types, raise it
|
|
if (
|
|
conn.retry_on_error is None
|
|
or isinstance(error, tuple(conn.retry_on_error)) is False
|
|
):
|
|
|
|
self.reset()
|
|
raise error
|
|
|
|
def execute(self, raise_on_error=True):
|
|
"""Execute all the commands in the current pipeline"""
|
|
stack = self.command_stack
|
|
if not stack and not self.watching:
|
|
return []
|
|
if self.scripts:
|
|
self.load_scripts()
|
|
if self.transaction or self.explicit_transaction:
|
|
execute = self._execute_transaction
|
|
else:
|
|
execute = self._execute_pipeline
|
|
|
|
conn = self.connection
|
|
if not conn:
|
|
conn = self.connection_pool.get_connection("MULTI", self.shard_hint)
|
|
# assign to self.connection so reset() releases the connection
|
|
# back to the pool after we're done
|
|
self.connection = conn
|
|
|
|
try:
|
|
return conn.retry.call_with_retry(
|
|
lambda: execute(conn, stack, raise_on_error),
|
|
lambda error: self._disconnect_raise_reset(conn, error),
|
|
)
|
|
finally:
|
|
self.reset()
|
|
|
|
def discard(self):
|
|
"""
|
|
Flushes all previously queued commands
|
|
See: https://redis.io/commands/DISCARD
|
|
"""
|
|
self.execute_command("DISCARD")
|
|
|
|
def watch(self, *names):
|
|
"""Watches the values at keys ``names``"""
|
|
if self.explicit_transaction:
|
|
raise RedisError("Cannot issue a WATCH after a MULTI")
|
|
return self.execute_command("WATCH", *names)
|
|
|
|
def unwatch(self) -> bool:
|
|
"""Unwatches all previously specified keys"""
|
|
return self.watching and self.execute_command("UNWATCH") or True
|