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cache: add doc

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This commit is contained in:
Willi Ballenthin
2023-01-21 18:20:14 +01:00
parent 2d1bbeda0c
commit e30dd08dec
2 changed files with 18 additions and 0 deletions
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16
capa/rules/cache.py
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@@ -103,6 +103,14 @@ def compute_ruleset_cache_identifier(ruleset: capa.rules.RuleSet) -> CacheIdenti
def cache_ruleset(cache_dir: str, ruleset: capa.rules.RuleSet): def cache_ruleset(cache_dir: str, ruleset: capa.rules.RuleSet):
"""
cache the given ruleset to disk, using the given cache directory.
this can subsequently be reloaded via `load_cached_ruleset`,
assuming the capa version and rule content does not change.
callers should use this function to avoid the performance overhead
of validating rules on each run.
"""
id = compute_ruleset_cache_identifier(ruleset) id = compute_ruleset_cache_identifier(ruleset)
path = get_cache_path(cache_dir, id) path = get_cache_path(cache_dir, id)
if os.path.exists(path): if os.path.exists(path):
@@ -118,6 +126,14 @@ def cache_ruleset(cache_dir: str, ruleset: capa.rules.RuleSet):
def load_cached_ruleset(cache_dir: str, rule_contents: List[bytes]) -> Optional[capa.rules.RuleSet]: def load_cached_ruleset(cache_dir: str, rule_contents: List[bytes]) -> Optional[capa.rules.RuleSet]:
"""
load a cached ruleset from disk, using the given cache directory.
the raw rule contents are required here to prove that the rules haven't changed
and to avoid stale cache entries.
callers should use this function to avoid the performance overhead
of validating rules on each run.
"""
id = compute_cache_identifier(rule_contents) id = compute_cache_identifier(rule_contents)
path = get_cache_path(cache_dir, id) path = get_cache_path(cache_dir, id)
if not os.path.exists(path): if not os.path.exists(path):

2
scripts/cache-ruleset.py
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@@ -1,5 +1,7 @@
""" """
Create a cache of the given rules. Create a cache of the given rules.
This is only really intended to be used by CI to pre-cache rulesets
that will be distributed within PyInstaller binaries.
Usage: Usage: