Viewing file:  kwconfig.py (1.56 KB) -rw-r--r--
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import re
from typing import Optional
from defence360agent.utils import atomic_rewrite
class KWConfig:
"""
Basic class for working with key-value configuration files
Subclasses must define SEARCH_PATTERN and WRITE_PATTERN
attributes
"""
SEARCH_PATTERN = DEFAULT_FILENAME = WRITE_PATTERN = ""
ALLOW_EMPTY_CONFIG = True
def __init__(self, name, filename=None):
assert self.SEARCH_PATTERN
self._pattern = re.compile(
self.SEARCH_PATTERN.format(name), re.MULTILINE
)
self._filename = filename or self.DEFAULT_FILENAME
self._name = name
def set(self, value) -> Optional[str]:
assert self.WRITE_PATTERN
with open(self._filename) as f:
content = f.read()
old_value = self._parse(content)
if old_value is None:
# If no variable found, just add to the bottom
content += (
"\n" + self.WRITE_PATTERN.format(self._name, value) + "\n"
)
else:
content = self._pattern.sub(
self.WRITE_PATTERN.format(self._name, value), content
)
atomic_rewrite(
self._filename,
content,
allow_empty_content=self.ALLOW_EMPTY_CONFIG,
)
return old_value
def get(self) -> Optional[str]:
with open(self._filename) as f:
content = f.read()
return self._parse(content)
def _parse(self, content) -> Optional[str]:
match = self._pattern.search(content)
return match and match.group(1)
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