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Cache git revCount / lastModified attributes

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Especially revCount is very slow to compute since it requires querying
the entire history.
This commit is contained in:
Eelco Dolstra 2022-08-11 12:37:10 +02:00
parent 3b45475f75
commit c0d33087c8
3 changed files with 100 additions and 22 deletions
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35
src/libfetchers/cache.cc
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@ -17,6 +17,12 @@ create table if not exists Cache (
timestamp integer not null,
primary key (input)
);
create table if not exists Facts (
name text not null,
value text not null,
primary key (name)
);
)sql";
struct CacheImpl : Cache
@ -24,7 +30,7 @@ struct CacheImpl : Cache
struct State
{
SQLite db;
SQLiteStmt add, lookup;
SQLiteStmt add, lookup, upsertFact, queryFact;
};
Sync<State> _state;
@ -33,7 +39,7 @@ struct CacheImpl : Cache
{
auto state(_state.lock());
auto dbPath = getCacheDir() + "/nix/fetcher-cache-v1.sqlite";
auto dbPath = getCacheDir() + "/nix/fetcher-cache-v2.sqlite";
createDirs(dirOf(dbPath));
state->db = SQLite(dbPath);
@ -45,6 +51,12 @@ struct CacheImpl : Cache
state->lookup.create(state->db,
"select info, path, immutable, timestamp from Cache where input = ?");
state->upsertFact.create(state->db,
"insert or replace into Facts(name, value) values (?, ?)");
state->queryFact.create(state->db,
"select value from Facts where name = ?");
}
void add(
@ -110,6 +122,25 @@ struct CacheImpl : Cache
.storePath = std::move(storePath)
};
}
void upsertFact(
std::string_view key,
std::string_view value) override
{
_state.lock()->upsertFact.use()
(key)
(value).exec();
}
std::optional<std::string> queryFact(std::string_view key) override
{
auto state(_state.lock());
auto stmt(state->queryFact.use()(key));
if (!stmt.next()) return {};
return stmt.getStr(0);
}
};
ref<Cache> getCache()