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import io
from pathlib import Path
from warnings import warn
from dynaconf import default_settings
from dynaconf.constants import YAML_EXTENSIONS
from dynaconf.loaders.base import BaseLoader
from dynaconf.utils import object_merge
from dynaconf.utils.parse_conf import try_to_encode
from dynaconf.vendor.ruamel import yaml
# Add support for Dynaconf Lazy values to YAML dumper
yaml.SafeDumper.yaml_representers[
None
] = lambda self, data: yaml.representer.SafeRepresenter.represent_str(
self, try_to_encode(data)
)
def load(obj, env=None, silent=True, key=None, filename=None):
"""
Reads and loads in to "obj" a single key or all keys from source file.
:param obj: the settings instance
:param env: settings current env default='development'
:param silent: if errors should raise
:param key: if defined load a single key, else load all in env
:param filename: Optional custom filename to load
:return: None
"""
# Resolve the loaders
# https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation
# Possible values are `safe_load, full_load, unsafe_load, load`
yaml_reader = getattr(
yaml, obj.get("YAML_LOADER_FOR_DYNACONF"), yaml.safe_load
)
if yaml_reader.__name__ == "unsafe_load": # pragma: no cover
warn(
"yaml.unsafe_load is deprecated."
" Please read https://msg.pyyaml.org/load for full details."
" Try to use full_load or safe_load."
)
loader = BaseLoader(
obj=obj,
env=env,
identifier="yaml",
extensions=YAML_EXTENSIONS,
file_reader=yaml_reader,
string_reader=yaml_reader,
)
loader.load(
filename=filename,
key=key,
silent=silent,
)
def write(settings_path, settings_data, merge=True):
"""Write data to a settings file.
:param settings_path: the filepath
:param settings_data: a dictionary with data
:param merge: boolean if existing file should be merged with new data
"""
settings_path = Path(settings_path)
if settings_path.exists() and merge: # pragma: no cover
with io.open(
str(settings_path), encoding=default_settings.ENCODING_FOR_DYNACONF
) as open_file:
object_merge(yaml.safe_load(open_file), settings_data)
with io.open(
str(settings_path),
"w",
encoding=default_settings.ENCODING_FOR_DYNACONF,
) as open_file:
yaml.dump(
settings_data,
open_file,
Dumper=yaml.dumper.SafeDumper,
explicit_start=True,
indent=2,
default_flow_style=False,
)
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