Make the realisation fetching from binary caches async
That way we can fetch several realisations from the same cache in parallel
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@ -441,16 +441,25 @@ void BinaryCacheStore::queryRealisationUncached(const DrvOutput & id,
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Callback<std::shared_ptr<const Realisation>> callback) noexcept
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{
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auto outputInfoFilePath = realisationsPrefix + "/" + id.to_string() + ".doi";
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auto rawOutputInfo = getFile(outputInfoFilePath);
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if (rawOutputInfo) {
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auto callbackPtr = std::make_shared<decltype(callback)>(std::move(callback));
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Callback<std::shared_ptr<std::string>> newCallback = {
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[=](std::future<std::shared_ptr<std::string>> fut) {
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try {
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auto data = fut.get();
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if (!data) return (*callbackPtr)(nullptr);
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auto realisation = Realisation::fromJSON(
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nlohmann::json::parse(*rawOutputInfo), outputInfoFilePath);
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callback(std::make_shared<const Realisation>(realisation));
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return;
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} else {
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callback(nullptr);
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nlohmann::json::parse(*data), outputInfoFilePath);
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return (*callbackPtr)(std::make_shared<const Realisation>(realisation));
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} catch (...) {
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callbackPtr->rethrow();
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}
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}
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};
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getFile(outputInfoFilePath, std::move(newCallback));
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}
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void BinaryCacheStore::registerDrvOutput(const Realisation& info) {
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