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#include "cache.hh"
#include "sqlite.hh"
#include "sync.hh"
#include "store-api.hh"
#include <nlohmann/json.hpp>
namespace nix::fetchers {
static const char * schema = R"sql(
create table if not exists Cache (
input text not null,
info text not null,
path text not null,
immutable integer not null,
timestamp integer not null,
primary key (input)
);
)sql";
struct CacheImpl : Cache
{
struct State
{
SQLite db;
SQLiteStmt add, lookup;
};
Sync<State> _state;
CacheImpl()
{
auto state(_state.lock());
auto dbPath = getCacheDir() + "/nix/fetcher-cache-v1.sqlite";
createDirs(dirOf(dbPath));
state->db = SQLite(dbPath);
state->db.isCache();
state->db.exec(schema);
state->add.create(state->db,
"insert or replace into Cache(input, info, path, immutable, timestamp) values (?, ?, ?, ?, ?)");
state->lookup.create(state->db,
"select info, path, immutable, timestamp from Cache where input = ?");
}
void add(
ref<Store> store,
const Attrs & inAttrs,
const Attrs & infoAttrs,
const StorePath & storePath,
bool immutable) override
{
_state.lock()->add.use()
(attrsToJson(inAttrs).dump())
(attrsToJson(infoAttrs).dump())
(store->printStorePath(storePath))
(immutable)
(time(0)).exec();
}
std::optional<std::pair<Attrs, StorePath>> lookup(
ref<Store> store,
const Attrs & inAttrs) override
{
if (auto res = lookupExpired(store, inAttrs)) {
if (!res->expired)
return std::make_pair(std::move(res->infoAttrs), std::move(res->storePath));
debug("ignoring expired cache entry '%s'",
attrsToJson(inAttrs).dump());
}
return {};
}
std::optional<Result> lookupExpired(
ref<Store> store,
const Attrs & inAttrs) override
{
auto state(_state.lock());
auto inAttrsJson = attrsToJson(inAttrs).dump();
auto stmt(state->lookup.use()(inAttrsJson));
if (!stmt.next()) {
debug("did not find cache entry for '%s'", inAttrsJson);
return {};
}
auto infoJson = stmt.getStr(0);
auto storePath = store->parseStorePath(stmt.getStr(1));
auto immutable = stmt.getInt(2) != 0;
auto timestamp = stmt.getInt(3);
store->addTempRoot(storePath);
if (!store->isValidPath(storePath)) {
// FIXME: we could try to substitute 'storePath'.
debug("ignoring disappeared cache entry '%s'", inAttrsJson);
return {};
}
debug("using cache entry '%s' -> '%s', '%s'",
inAttrsJson, infoJson, store->printStorePath(storePath));
return Result {
.expired = !immutable && (settings.tarballTtl.get() == 0 || timestamp + settings.tarballTtl < time(0)),
.infoAttrs = jsonToAttrs(nlohmann::json::parse(infoJson)),
.storePath = std::move(storePath)
};
}
};
ref<Cache> getCache()
{
static auto cache = std::make_shared<CacheImpl>();
return ref<Cache>(cache);
}
}
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