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Make the realisation fetching from binary caches async

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That way we can fetch several realisations from the same cache in
parallel
This commit is contained in:
regnat 2021-10-27 11:50:57 +02:00
parent 96670ed216
commit fbc70034b3
1 changed files with 18 additions and 9 deletions
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27
src/libstore/binary-cache-store.cc
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@ -441,16 +441,25 @@ void BinaryCacheStore::queryRealisationUncached(const DrvOutput & id,
Callback<std::shared_ptr<const Realisation>> callback) noexcept
{
auto outputInfoFilePath = realisationsPrefix + "/" + id.to_string() + ".doi";
auto rawOutputInfo = getFile(outputInfoFilePath);
if (rawOutputInfo) {
auto realisation = Realisation::fromJSON(
nlohmann::json::parse(*rawOutputInfo), outputInfoFilePath);
callback(std::make_shared<const Realisation>(realisation));
return;
} else {
callback(nullptr);
}
auto callbackPtr = std::make_shared<decltype(callback)>(std::move(callback));
Callback<std::shared_ptr<std::string>> newCallback = {
[=](std::future<std::shared_ptr<std::string>> fut) {
try {
auto data = fut.get();
if (!data) return (*callbackPtr)(nullptr);
auto realisation = Realisation::fromJSON(
nlohmann::json::parse(*data), outputInfoFilePath);
return (*callbackPtr)(std::make_shared<const Realisation>(realisation));
} catch (...) {
callbackPtr->rethrow();
}
}
};
getFile(outputInfoFilePath, std::move(newCallback));
}
void BinaryCacheStore::registerDrvOutput(const Realisation& info) {