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Cache result of Input::getFingerprint()

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The fingerprint calculation can be expensive (especially for dirty Git
trees) so we need to cache it.
This commit is contained in:
Eelco Dolstra 2024-12-04 13:17:31 +01:00
parent d044a05197
commit f469bc2ae4
2 changed files with 16 additions and 3 deletions
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14
src/libfetchers/fetchers.cc
View file

@ -113,7 +113,15 @@ Input Input::fromAttrs(const Settings & settings, Attrs && attrs)
std::optional<std::string> Input::getFingerprint(ref<Store> store) const
{
return scheme ? scheme->getFingerprint(store, *this) : std::nullopt;
if (!scheme) return std::nullopt;
if (cachedFingerprint) return *cachedFingerprint;
auto fingerprint = scheme->getFingerprint(store, *this);
cachedFingerprint = fingerprint;
return fingerprint;
}
ParsedURL Input::toURL() const
@ -307,7 +315,7 @@ std::pair<ref<SourceAccessor>, Input> Input::getAccessorUnchecked(ref<Store> sto
auto accessor = makeStorePathAccessor(store, storePath);
accessor->fingerprint = scheme->getFingerprint(store, *this);
accessor->fingerprint = getFingerprint(store);
return {accessor, *this};
} catch (Error & e) {
@ -318,7 +326,7 @@ std::pair<ref<SourceAccessor>, Input> Input::getAccessorUnchecked(ref<Store> sto
auto [accessor, result] = scheme->getAccessor(store, *this);
assert(!accessor->fingerprint);
accessor->fingerprint = scheme->getFingerprint(store, result);
accessor->fingerprint = result.getFingerprint(store);
return {accessor, std::move(result)};
}

5
src/libfetchers/fetchers.hh
View file

@ -46,6 +46,11 @@ struct Input
*/
std::optional<Path> parent;
/**
* Cached result of getFingerprint().
*/
mutable std::optional<std::optional<std::string>> cachedFingerprint;
public:
/**
* Create an `Input` from a URL.