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Merge pull request #9794 from hercules-ci/queryPathInfoFromClientCache 

refactor: Extract `Store::queryPathInfoFromClientCache`
This commit is contained in:
Robert Hensing 2024-01-19 17:33:52 +01:00 committed by GitHub
parent e6e160a075 d19627e8b4
commit 382fa51ff0
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GPG Key ID: B5690EEEBB952194
2 changed files with 53 additions and 25 deletions
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68
src/libstore/store-api.cc
View File

@ -686,38 +686,56 @@ static bool goodStorePath(const StorePath & expected, const StorePath & actual)
}
std::optional<std::shared_ptr<const ValidPathInfo>> Store::queryPathInfoFromClientCache(const StorePath & storePath)
{
auto hashPart = std::string(storePath.hashPart());
{
auto res = state.lock()->pathInfoCache.get(std::string(storePath.to_string()));
if (res && res->isKnownNow()) {
stats.narInfoReadAverted++;
if (res->didExist())
return std::make_optional(res->value);
else
return std::make_optional(nullptr);
}
}
if (diskCache) {
auto res = diskCache->lookupNarInfo(getUri(), hashPart);
if (res.first != NarInfoDiskCache::oUnknown) {
stats.narInfoReadAverted++;
{
auto state_(state.lock());
state_->pathInfoCache.upsert(std::string(storePath.to_string()),
res.first == NarInfoDiskCache::oInvalid ? PathInfoCacheValue{} : PathInfoCacheValue{ .value = res.second });
if (res.first == NarInfoDiskCache::oInvalid ||
!goodStorePath(storePath, res.second->path))
return std::make_optional(nullptr);
}
assert(res.second);
return std::make_optional(res.second);
}
}
return std::nullopt;
}
void Store::queryPathInfo(const StorePath & storePath,
Callback<ref<const ValidPathInfo>> callback) noexcept
{
auto hashPart = std::string(storePath.hashPart());
try {
{
auto res = state.lock()->pathInfoCache.get(std::string(storePath.to_string()));
if (res && res->isKnownNow()) {
stats.narInfoReadAverted++;
if (!res->didExist())
throw InvalidPath("path '%s' is not valid", printStorePath(storePath));
return callback(ref<const ValidPathInfo>(res->value));
}
auto r = queryPathInfoFromClientCache(storePath);
if (r.has_value()) {
std::shared_ptr<const ValidPathInfo> & info = *r;
if (info)
return callback(ref(info));
else
throw InvalidPath("path '%s' is not valid", printStorePath(storePath));
}
if (diskCache) {
auto res = diskCache->lookupNarInfo(getUri(), hashPart);
if (res.first != NarInfoDiskCache::oUnknown) {
stats.narInfoReadAverted++;
{
auto state_(state.lock());
state_->pathInfoCache.upsert(std::string(storePath.to_string()),
res.first == NarInfoDiskCache::oInvalid ? PathInfoCacheValue{} : PathInfoCacheValue{ .value = res.second });
if (res.first == NarInfoDiskCache::oInvalid ||
!goodStorePath(storePath, res.second->path))
throw InvalidPath("path '%s' is not valid", printStorePath(storePath));
}
return callback(ref<const ValidPathInfo>(res.second));
}
}
} catch (...) { return callback.rethrow(); }
auto callbackPtr = std::make_shared<decltype(callback)>(std::move(callback));

10
src/libstore/store-api.hh
View File

@ -282,6 +282,16 @@ public:
void queryPathInfo(const StorePath & path,
Callback<ref<const ValidPathInfo>> callback) noexcept;
/**
* Version of queryPathInfo() that only queries the local narinfo cache and not
* the actual store.
*
* @return `std::nullopt` if nothing is known about the path in the local narinfo cache.
* @return `std::make_optional(nullptr)` if the path is known to not exist.
* @return `std::make_optional(validPathInfo)` if the path is known to exist.
*/
std::optional<std::shared_ptr<const ValidPathInfo>> queryPathInfoFromClientCache(const StorePath & path);
/**
* Query the information about a realisation.
*/