71 lines
2.8 KiB
Diff
71 lines
2.8 KiB
Diff
diff --git a/src/libstore/nar-info-disk-cache.cc b/src/libstore/nar-info-disk-cache.cc
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index f4ea739b05d..3e0689534b6 100644
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--- a/src/libstore/nar-info-disk-cache.cc
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+++ b/src/libstore/nar-info-disk-cache.cc
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@@ -166,16 +166,37 @@ class NarInfoDiskCacheImpl : public NarInfoDiskCache
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return i->second;
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}
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+ std::optional<Cache> queryCacheRaw(State & state, const std::string & uri)
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+ {
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+ auto i = state.caches.find(uri);
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+ if (i == state.caches.end()) {
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+ auto queryCache(state.queryCache.use()(uri)(time(0) - cacheInfoTtl));
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+ if (!queryCache.next())
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+ return std::nullopt;
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+ state.caches.emplace(uri,
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+ Cache{(int) queryCache.getInt(0), queryCache.getStr(1), queryCache.getInt(2) != 0, (int) queryCache.getInt(3)});
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+ }
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+ return getCache(state, uri);
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+ }
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+
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void createCache(const std::string & uri, const Path & storeDir, bool wantMassQuery, int priority) override
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{
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retrySQLite<void>([&]() {
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auto state(_state.lock());
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+ SQLiteTxn txn(state->db);
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+
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+ // To avoid the race, we have to check if maybe someone hasn't yet created
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+ // the cache for this URI in the meantime.
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+ auto cache(queryCacheRaw(*state, uri));
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- // FIXME: race
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+ if (cache)
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+ return;
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state->insertCache.use()(uri)(time(0))(storeDir)(wantMassQuery)(priority).exec();
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assert(sqlite3_changes(state->db) == 1);
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state->caches[uri] = Cache{(int) sqlite3_last_insert_rowid(state->db), storeDir, wantMassQuery, priority};
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+
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+ txn.commit();
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});
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}
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@@ -183,21 +204,12 @@ class NarInfoDiskCacheImpl : public NarInfoDiskCache
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{
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return retrySQLite<std::optional<CacheInfo>>([&]() -> std::optional<CacheInfo> {
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auto state(_state.lock());
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-
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- auto i = state->caches.find(uri);
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- if (i == state->caches.end()) {
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- auto queryCache(state->queryCache.use()(uri)(time(0) - cacheInfoTtl));
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- if (!queryCache.next())
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- return std::nullopt;
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- state->caches.emplace(uri,
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- Cache{(int) queryCache.getInt(0), queryCache.getStr(1), queryCache.getInt(2) != 0, (int) queryCache.getInt(3)});
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- }
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-
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- auto & cache(getCache(*state, uri));
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-
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+ auto cache(queryCacheRaw(*state, uri));
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+ if (!cache)
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+ return std::nullopt;
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return CacheInfo {
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- .wantMassQuery = cache.wantMassQuery,
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- .priority = cache.priority
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+ .wantMassQuery = cache->wantMassQuery,
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+ .priority = cache->priority
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};
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});
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}
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