154 lines
4.7 KiB
Python
154 lines
4.7 KiB
Python
"""ruamel.yaml utility functions."""
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from collections import OrderedDict
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import logging
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import os
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from os import O_CREAT, O_TRUNC, O_WRONLY, stat_result
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from typing import Dict, List, Optional, Union
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import ruamel.yaml
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from ruamel.yaml import YAML
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from ruamel.yaml.compat import StringIO
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from ruamel.yaml.constructor import SafeConstructor
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from ruamel.yaml.error import YAMLError
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from homeassistant.exceptions import HomeAssistantError
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from homeassistant.util.yaml import secret_yaml
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_LOGGER = logging.getLogger(__name__)
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JSON_TYPE = Union[List, Dict, str] # pylint: disable=invalid-name
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class ExtSafeConstructor(SafeConstructor):
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"""Extended SafeConstructor."""
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name: Optional[str] = None
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class UnsupportedYamlError(HomeAssistantError):
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"""Unsupported YAML."""
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class WriteError(HomeAssistantError):
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"""Error writing the data."""
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def _include_yaml(
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constructor: ExtSafeConstructor, node: ruamel.yaml.nodes.Node
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) -> JSON_TYPE:
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"""Load another YAML file and embeds it using the !include tag.
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Example:
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device_tracker: !include device_tracker.yaml
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"""
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if constructor.name is None:
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raise HomeAssistantError(
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"YAML include error: filename not set for %s" % node.value
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)
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fname = os.path.join(os.path.dirname(constructor.name), node.value)
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return load_yaml(fname, False)
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def _yaml_unsupported(
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constructor: ExtSafeConstructor, node: ruamel.yaml.nodes.Node
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) -> None:
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raise UnsupportedYamlError(
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"Unsupported YAML, you can not use {} in {}".format(
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node.tag, os.path.basename(constructor.name or "(None)")
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)
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)
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def object_to_yaml(data: JSON_TYPE) -> str:
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"""Create yaml string from object."""
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yaml = YAML(typ="rt")
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yaml.indent(sequence=4, offset=2)
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stream = StringIO()
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try:
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yaml.dump(data, stream)
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result: str = stream.getvalue()
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return result
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except YAMLError as exc:
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_LOGGER.error("YAML error: %s", exc)
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raise HomeAssistantError(exc)
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def yaml_to_object(data: str) -> JSON_TYPE:
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"""Create object from yaml string."""
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yaml = YAML(typ="rt")
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try:
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result: Union[List, Dict, str] = yaml.load(data)
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return result
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except YAMLError as exc:
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_LOGGER.error("YAML error: %s", exc)
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raise HomeAssistantError(exc)
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def load_yaml(fname: str, round_trip: bool = False) -> JSON_TYPE:
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"""Load a YAML file."""
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if round_trip:
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yaml = YAML(typ="rt")
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# type ignore: https://bitbucket.org/ruamel/yaml/pull-requests/42
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yaml.preserve_quotes = True # type: ignore
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else:
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if ExtSafeConstructor.name is None:
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ExtSafeConstructor.name = fname
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yaml = YAML(typ="safe")
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yaml.Constructor = ExtSafeConstructor
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try:
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with open(fname, encoding="utf-8") as conf_file:
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# If configuration file is empty YAML returns None
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# We convert that to an empty dict
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return yaml.load(conf_file) or OrderedDict()
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except YAMLError as exc:
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_LOGGER.error("YAML error in %s: %s", fname, exc)
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raise HomeAssistantError(exc)
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except UnicodeDecodeError as exc:
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_LOGGER.error("Unable to read file %s: %s", fname, exc)
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raise HomeAssistantError(exc)
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def save_yaml(fname: str, data: JSON_TYPE) -> None:
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"""Save a YAML file."""
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yaml = YAML(typ="rt")
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yaml.indent(sequence=4, offset=2)
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tmp_fname = f"{fname}__TEMP__"
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try:
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try:
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file_stat = os.stat(fname)
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except OSError:
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file_stat = stat_result((0o644, -1, -1, -1, -1, -1, -1, -1, -1, -1))
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with open(
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os.open(tmp_fname, O_WRONLY | O_CREAT | O_TRUNC, file_stat.st_mode),
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"w",
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encoding="utf-8",
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) as temp_file:
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yaml.dump(data, temp_file)
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os.replace(tmp_fname, fname)
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if hasattr(os, "chown") and file_stat.st_ctime > -1:
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try:
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os.chown(fname, file_stat.st_uid, file_stat.st_gid)
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except OSError:
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pass
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except YAMLError as exc:
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_LOGGER.error(str(exc))
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raise HomeAssistantError(exc)
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except OSError as exc:
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_LOGGER.exception("Saving YAML file %s failed: %s", fname, exc)
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raise WriteError(exc)
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finally:
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if os.path.exists(tmp_fname):
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try:
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os.remove(tmp_fname)
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except OSError as exc:
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# If we are cleaning up then something else went wrong, so
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# we should suppress likely follow-on errors in the cleanup
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_LOGGER.error("YAML replacement cleanup failed: %s", exc)
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ExtSafeConstructor.add_constructor("!secret", secret_yaml)
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ExtSafeConstructor.add_constructor("!include", _include_yaml)
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ExtSafeConstructor.add_constructor(None, _yaml_unsupported)
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