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from __future__ import annotations
import configparser
import json
import os
import warnings
from typing import Any
conf: dict[str, dict[str, Any]] = {}
default_conf_dir = os.path.join(os.path.expanduser("~"), ".config/fsspec")
conf_dir = os.environ.get("FSSPEC_CONFIG_DIR", default_conf_dir)
def set_conf_env(conf_dict, envdict=os.environ):
"""Set config values from environment variables
Looks for variables of the form ``FSSPEC_<protocol>`` and
``FSSPEC_<protocol>_<kwarg>``. For ``FSSPEC_<protocol>`` the value is parsed
as a json dictionary and used to ``update`` the config of the
corresponding protocol. For ``FSSPEC_<protocol>_<kwarg>`` there is no
attempt to convert the string value, but the kwarg keys will be lower-cased.
The ``FSSPEC_<protocol>_<kwarg>`` variables are applied after the
``FSSPEC_<protocol>`` ones.
Parameters
----------
conf_dict : dict(str, dict)
This dict will be mutated
envdict : dict-like(str, str)
Source for the values - usually the real environment
"""
kwarg_keys = []
for key in envdict:
if key.startswith("FSSPEC_") and len(key) > 7 and key[7] != "_":
if key.count("_") > 1:
kwarg_keys.append(key)
continue
try:
value = json.loads(envdict[key])
except json.decoder.JSONDecodeError as ex:
warnings.warn(
f"Ignoring environment variable {key} due to a parse failure: {ex}"
)
else:
if isinstance(value, dict):
_, proto = key.split("_", 1)
conf_dict.setdefault(proto.lower(), {}).update(value)
else:
warnings.warn(
f"Ignoring environment variable {key} due to not being a dict:"
f" {type(value)}"
)
elif key.startswith("FSSPEC"):
warnings.warn(
f"Ignoring environment variable {key} due to having an unexpected name"
)
for key in kwarg_keys:
_, proto, kwarg = key.split("_", 2)
conf_dict.setdefault(proto.lower(), {})[kwarg.lower()] = envdict[key]
def set_conf_files(cdir, conf_dict):
"""Set config values from files
Scans for INI and JSON files in the given dictionary, and uses their
contents to set the config. In case of repeated values, later values
win.
In the case of INI files, all values are strings, and these will not
be converted.
Parameters
----------
cdir : str
Directory to search
conf_dict : dict(str, dict)
This dict will be mutated
"""
if not os.path.isdir(cdir):
return
allfiles = sorted(os.listdir(cdir))
for fn in allfiles:
if fn.endswith(".ini"):
ini = configparser.ConfigParser()
ini.read(os.path.join(cdir, fn))
for key in ini:
if key == "DEFAULT":
continue
conf_dict.setdefault(key, {}).update(dict(ini[key]))
if fn.endswith(".json"):
with open(os.path.join(cdir, fn)) as f:
js = json.load(f)
for key in js:
conf_dict.setdefault(key, {}).update(dict(js[key]))
def apply_config(cls, kwargs, conf_dict=None):
"""Supply default values for kwargs when instantiating class
Augments the passed kwargs, by finding entries in the config dict
which match the classes ``.protocol`` attribute (one or more str)
Parameters
----------
cls : file system implementation
kwargs : dict
conf_dict : dict of dict
Typically this is the global configuration
Returns
-------
dict : the modified set of kwargs
"""
if conf_dict is None:
conf_dict = conf
protos = cls.protocol if isinstance(cls.protocol, (tuple, list)) else [cls.protocol]
kw = {}
for proto in protos:
# default kwargs from the current state of the config
if proto in conf_dict:
kw.update(conf_dict[proto])
# explicit kwargs always win
kw.update(**kwargs)
kwargs = kw
return kwargs
set_conf_files(conf_dir, conf)
set_conf_env(conf)
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