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from contextlib import contextmanager
from functools import wraps
from typing import Any, Dict, Mapping, Union
try:
import hiredis # noqa
# Only support Hiredis >= 1.0:
HIREDIS_AVAILABLE = not hiredis.__version__.startswith("0.")
HIREDIS_PACK_AVAILABLE = hasattr(hiredis, "pack_command")
except ImportError:
HIREDIS_AVAILABLE = False
HIREDIS_PACK_AVAILABLE = False
try:
import cryptography # noqa
CRYPTOGRAPHY_AVAILABLE = True
except ImportError:
CRYPTOGRAPHY_AVAILABLE = False
def from_url(url, **kwargs):
"""
Returns an active Redis client generated from the given database URL.
Will attempt to extract the database id from the path url fragment, if
none is provided.
"""
from redis.client import Redis
return Redis.from_url(url, **kwargs)
@contextmanager
def pipeline(redis_obj):
p = redis_obj.pipeline()
yield p
p.execute()
def str_if_bytes(value: Union[str, bytes]) -> str:
return (
value.decode("utf-8", errors="replace") if isinstance(value, bytes) else value
)
def safe_str(value):
return str(str_if_bytes(value))
def dict_merge(*dicts: Mapping[str, Any]) -> Dict[str, Any]:
"""
Merge all provided dicts into 1 dict.
*dicts : `dict`
dictionaries to merge
"""
merged = {}
for d in dicts:
merged.update(d)
return merged
def list_keys_to_dict(key_list, callback):
return dict.fromkeys(key_list, callback)
def merge_result(command, res):
"""
Merge all items in `res` into a list.
This command is used when sending a command to multiple nodes
and the result from each node should be merged into a single list.
res : 'dict'
"""
result = set()
for v in res.values():
for value in v:
result.add(value)
return list(result)
def warn_deprecated(name, reason="", version="", stacklevel=2):
import warnings
msg = f"Call to deprecated {name}."
if reason:
msg += f" ({reason})"
if version:
msg += f" -- Deprecated since version {version}."
warnings.warn(msg, category=DeprecationWarning, stacklevel=stacklevel)
def deprecated_function(reason="", version="", name=None):
"""
Decorator to mark a function as deprecated.
"""
def decorator(func):
@wraps(func)
def wrapper(*args, **kwargs):
warn_deprecated(name or func.__name__, reason, version, stacklevel=3)
return func(*args, **kwargs)
return wrapper
return decorator
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