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Fetcher cache: Add support for caching facts not related to store paths

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This commit is contained in:
Eelco Dolstra 2023-10-24 08:20:31 +02:00
parent fa6bc33604
commit e1b8442fa1
2 changed files with 95 additions and 0 deletions
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57
src/libfetchers/cache.cc
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@ -19,6 +19,9 @@ create table if not exists Cache (
);
)sql";
// FIXME: we should periodically purge/nuke this cache to prevent it
// from growing too big.
struct CacheImpl : Cache
{
struct State
@ -47,6 +50,60 @@ struct CacheImpl : Cache
"select info, path, immutable, timestamp from Cache where input = ?");
}
void upsert(
const Attrs & inAttrs,
const Attrs & infoAttrs) override
{
_state.lock()->add.use()
(attrsToJSON(inAttrs).dump())
(attrsToJSON(infoAttrs).dump())
("") // no path
(false)
(time(0)).exec();
}
std::optional<Attrs> lookup(const Attrs & inAttrs) override
{
if (auto res = lookupExpired(inAttrs))
return std::move(res->infoAttrs);
return {};
}
std::optional<Attrs> lookupWithTTL(const Attrs & inAttrs) override
{
if (auto res = lookupExpired(inAttrs)) {
if (!res->expired)
return std::move(res->infoAttrs);
debug("ignoring expired cache entry '%s'",
attrsToJSON(inAttrs).dump());
}
return {};
}
std::optional<Result2> lookupExpired(const Attrs & inAttrs) override
{
auto state(_state.lock());
auto inAttrsJSON = attrsToJSON(inAttrs).dump();
auto stmt(state->lookup.use()(inAttrsJSON));
if (!stmt.next()) {
debug("did not find cache entry for '%s'", inAttrsJSON);
return {};
}
auto infoJSON = stmt.getStr(0);
auto locked = stmt.getInt(2) != 0;
auto timestamp = stmt.getInt(3);
debug("using cache entry '%s' -> '%s'", inAttrsJSON, infoJSON);
return Result2 {
.expired = !locked && (settings.tarballTtl.get() == 0 || timestamp + settings.tarballTtl < time(0)),
.infoAttrs = jsonToAttrs(nlohmann::json::parse(infoJSON)),
};
}
void add(
ref<Store> store,
const Attrs & inAttrs,