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Simplify the fetcher cache

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This commit is contained in:
Eelco Dolstra 2024-04-10 20:59:18 +02:00
parent d084c1cb41
commit aad11f4496
8 changed files with 187 additions and 173 deletions
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61
src/libfetchers/cache.hh
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@ -19,56 +19,73 @@ struct Cache
* Attrs to Attrs.
*/
virtual void upsert(
const Attrs & inAttrs,
const Attrs & infoAttrs) = 0;
std::string_view domain,
const Attrs & key,
const Attrs & value) = 0;
/**
* Look up a key with infinite TTL.
*/
virtual std::optional<Attrs> lookup(
const Attrs & inAttrs) = 0;
std::string_view domain,
const Attrs & key) = 0;
/**
* Look up a key. Return nothing if its TTL has exceeded
* `settings.tarballTTL`.
*/
virtual std::optional<Attrs> lookupWithTTL(
const Attrs & inAttrs) = 0;
std::string_view domain,
const Attrs & key) = 0;
struct Result2
struct Result
{
bool expired = false;
Attrs infoAttrs;
Attrs value;
};
/**
* Look up a key. Return a bool denoting whether its TTL has
* exceeded `settings.tarballTTL`.
*/
virtual std::optional<Result2> lookupExpired(
const Attrs & inAttrs) = 0;
virtual std::optional<Result> lookupExpired(
std::string_view domain,
const Attrs & key) = 0;
/* Old cache for things that have a store path. */
virtual void add(
/**
* Insert a cache entry that has a store path associated with
* it. Such cache entries are always considered stale if the
* associated store path is invalid.
*/
virtual void upsert(
std::string_view domain,
Attrs key,
Store & store,
const Attrs & inAttrs,
const Attrs & infoAttrs,
Attrs value,
const StorePath & storePath) = 0;
virtual std::optional<std::pair<Attrs, StorePath>> lookup(
Store & store,
const Attrs & inAttrs) = 0;
struct Result
struct ResultWithStorePath : Result
{
bool expired = false;
Attrs infoAttrs;
StorePath storePath;
};
virtual std::optional<Result> lookupExpired(
Store & store,
const Attrs & inAttrs) = 0;
/**
* Look up a store path in the cache. The returned store path will
* be valid, but it may be expired.
*/
virtual std::optional<ResultWithStorePath> lookupStorePath(
std::string_view domain,
Attrs key,
Store & store) = 0;
/**
* Look up a store path in the cache. Return nothing if its TTL
* has exceeded `settings.tarballTTL`.
*/
virtual std::optional<ResultWithStorePath> lookupStorePathWithTTL(
std::string_view domain,
Attrs key,
Store & store) = 0;
};
ref<Cache> getCache();