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Merge pull request #5472 from NixOS/async-realisation-substitution

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async realisation substitution
This commit is contained in:
Eelco Dolstra 2021-11-16 12:54:20 +01:00 • committed by GitHub
commit 6463eaca14
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14 changed files with 204 additions and 65 deletions
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47
src/libstore/binary-cache-store.cc
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@ -439,40 +439,29 @@ 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);
auto callbackPtr = std::make_shared<decltype(callback)>(std::move(callback));
if (diskCache)
diskCache->upsertRealisation(
getUri(), realisation);
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);
return {realisation};
} else {
if (diskCache)
diskCache->upsertAbsentRealisation(getUri(), id);
return std::nullopt;
}
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) {