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refactor: Extract simply, awkwardly Store::queryPathInfoFromClientCache

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This is useful for determining quickly which substituters to query.

An alternative would be for users to invoke the narinfo cache db directly,
so why do we need this change?

 - It is easier to use. I believe Nix itself should also use it.

 - This way, the narinfo cache db remains an implementation detail.

 - Callers get to use the in-memory cache as well.
This commit is contained in:
Robert Hensing 2024-01-17 16:54:45 +01:00
parent 01271f2996
commit d0a284284b
2 changed files with 50 additions and 26 deletions
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64
src/libstore/store-api.cc
View file

@ -685,6 +685,42 @@ static bool goodStorePath(const StorePath & expected, const StorePath & actual)
&& (expected.name() == Store::MissingName || expected.name() == actual.name());
}
bool Store::queryPathInfoFromClientCache(const StorePath & storePath,
Callback<ref<const ValidPathInfo>> & callback)
{
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())
throw InvalidPath("path '%s' is not valid", printStorePath(storePath));
callback(ref<const ValidPathInfo>(res->value));
return true;
}
}
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));
}
callback(ref<const ValidPathInfo>(res.second));
return true;
}
}
return false;
}
void Store::queryPathInfo(const StorePath & storePath,
Callback<ref<const ValidPathInfo>> callback) noexcept
@ -692,32 +728,8 @@ void Store::queryPathInfo(const StorePath & storePath,
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));
}
}
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));
}
}
if (queryPathInfoFromClientCache(storePath, callback))
return;
} catch (...) { return callback.rethrow(); }
auto callbackPtr = std::make_shared<decltype(callback)>(std::move(callback));

12
src/libstore/store-api.hh
View file

@ -282,6 +282,18 @@ public:
void queryPathInfo(const StorePath & path,
Callback<ref<const ValidPathInfo>> callback) noexcept;
/**
* NOTE: this is not the final interface - to be modified in next commit.
*
* Asynchronous version that only queries the local narinfo cache and not
* the actual store.
*
* @return true if the path was known and the callback invoked
* @return false if the path was not known and the callback not invoked
* @throw InvalidPathError if the path is known to be invalid
*/
bool queryPathInfoFromClientCache(const StorePath & path, Callback<ref<const ValidPathInfo>> & callback);
/**
* Query the information about a realisation.
*/