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Expose an async interface for queryRealisation

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Doesn’t change much so far because everything is still using it
synchronously, but should allow the binary cache to fetch stuff in
parallel
This commit is contained in:
regnat 2021-10-27 11:36:51 +02:00
parent 5b2aa61f1b
commit 96670ed216
12 changed files with 138 additions and 55 deletions
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30
src/libstore/binary-cache-store.cc
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@ -437,39 +437,19 @@ StorePath BinaryCacheStore::addTextToStore(const string & name, const string & s
})->path;
}
std::optional<const Realisation> BinaryCacheStore::queryRealisation(const DrvOutput & id)
void BinaryCacheStore::queryRealisationUncached(const DrvOutput & id,
Callback<std::shared_ptr<const Realisation>> callback) noexcept
{
if (diskCache) {
auto [cacheOutcome, maybeCachedRealisation] =
diskCache->lookupRealisation(getUri(), id);
switch (cacheOutcome) {
case NarInfoDiskCache::oValid:
debug("Returning a cached realisation for %s", id.to_string());
return *maybeCachedRealisation;
case NarInfoDiskCache::oInvalid:
debug("Returning a cached missing realisation for %s", id.to_string());
return {};
case NarInfoDiskCache::oUnknown:
break;
}
}
auto outputInfoFilePath = realisationsPrefix + "/" + id.to_string() + ".doi";
auto rawOutputInfo = getFile(outputInfoFilePath);
if (rawOutputInfo) {
auto realisation = Realisation::fromJSON(
nlohmann::json::parse(*rawOutputInfo), outputInfoFilePath);
if (diskCache)
diskCache->upsertRealisation(
getUri(), realisation);
return {realisation};
callback(std::make_shared<const Realisation>(realisation));
return;
} else {
if (diskCache)
diskCache->upsertAbsentRealisation(getUri(), id);
return std::nullopt;
callback(nullptr);
}
}