tdlight/test/db.cpp
2024-01-01 03:07:21 +03:00

810 lines
23 KiB
C++

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2024
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "data.h"
#include "td/db/binlog/BinlogHelper.h"
#include "td/db/binlog/ConcurrentBinlog.h"
#include "td/db/BinlogKeyValue.h"
#include "td/db/DbKey.h"
#include "td/db/SeqKeyValue.h"
#include "td/db/SqliteConnectionSafe.h"
#include "td/db/SqliteDb.h"
#include "td/db/SqliteKeyValue.h"
#include "td/db/SqliteKeyValueSafe.h"
#include "td/db/TsSeqKeyValue.h"
#include "td/actor/actor.h"
#include "td/actor/ConcurrentScheduler.h"
#include "td/utils/base64.h"
#include "td/utils/common.h"
#include "td/utils/filesystem.h"
#include "td/utils/FlatHashMap.h"
#include "td/utils/logging.h"
#include "td/utils/port/FileFd.h"
#include "td/utils/port/thread.h"
#include "td/utils/Random.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
#include "td/utils/StringBuilder.h"
#include "td/utils/tests.h"
#include <limits>
#include <map>
#include <memory>
template <class ContainerT>
static typename ContainerT::value_type &rand_elem(ContainerT &cont) {
CHECK(0 < cont.size() && cont.size() <= static_cast<std::size_t>(std::numeric_limits<int>::max()));
return cont[td::Random::fast(0, static_cast<int>(cont.size()) - 1)];
}
TEST(DB, binlog_encryption_bug) {
td::CSlice binlog_name = "test_binlog";
td::Binlog::destroy(binlog_name).ignore();
auto cucumber = td::DbKey::password("cucu'\"mb er");
auto empty = td::DbKey::empty();
{
td::Binlog binlog;
binlog
.init(
binlog_name.str(), [&](const td::BinlogEvent &x) {}, cucumber)
.ensure();
}
{
td::Binlog binlog;
binlog
.init(
binlog_name.str(), [&](const td::BinlogEvent &x) {}, cucumber)
.ensure();
}
td::Binlog::destroy(binlog_name).ignore();
}
TEST(DB, binlog_encryption) {
td::CSlice binlog_name = "test_binlog";
td::Binlog::destroy(binlog_name).ignore();
auto hello = td::DbKey::raw_key(td::string(32, 'A'));
auto cucumber = td::DbKey::password("cucu'\"mb er");
auto empty = td::DbKey::empty();
auto long_data = td::string(10000, 'Z');
{
td::Binlog binlog;
binlog.init(binlog_name.str(), [](const td::BinlogEvent &x) {}).ensure();
binlog.add_raw_event(td::BinlogEvent::create_raw(binlog.next_event_id(), 1, 0, td::create_storer("AAAA")),
td::BinlogDebugInfo{__FILE__, __LINE__});
binlog.add_raw_event(td::BinlogEvent::create_raw(binlog.next_event_id(), 1, 0, td::create_storer("BBBB")),
td::BinlogDebugInfo{__FILE__, __LINE__});
binlog.add_raw_event(td::BinlogEvent::create_raw(binlog.next_event_id(), 1, 0, td::create_storer(long_data)),
td::BinlogDebugInfo{__FILE__, __LINE__});
LOG(INFO) << "SET PASSWORD";
binlog.change_key(cucumber);
binlog.change_key(hello);
LOG(INFO) << "OK";
binlog.add_raw_event(td::BinlogEvent::create_raw(binlog.next_event_id(), 1, 0, td::create_storer("CCCC")),
td::BinlogDebugInfo{__FILE__, __LINE__});
binlog.close().ensure();
}
td::Binlog::destroy(binlog_name).ignore();
return;
auto add_suffix = [&] {
auto fd = td::FileFd::open(binlog_name, td::FileFd::Flags::Write | td::FileFd::Flags::Append).move_as_ok();
fd.write("abacabadaba").ensure();
};
add_suffix();
{
td::vector<td::string> v;
LOG(INFO) << "RESTART";
td::Binlog binlog;
binlog
.init(
binlog_name.str(), [&](const td::BinlogEvent &x) { v.push_back(x.get_data().str()); }, hello)
.ensure();
CHECK(v == td::vector<td::string>({"AAAA", "BBBB", long_data, "CCCC"}));
}
add_suffix();
{
td::vector<td::string> v;
LOG(INFO) << "RESTART";
td::Binlog binlog;
auto status = binlog.init(
binlog_name.str(), [&](const td::BinlogEvent &x) { v.push_back(x.get_data().str()); }, cucumber);
CHECK(status.is_error());
}
add_suffix();
{
td::vector<td::string> v;
LOG(INFO) << "RESTART";
td::Binlog binlog;
auto status = binlog.init(
binlog_name.str(), [&](const td::BinlogEvent &x) { v.push_back(x.get_data().str()); }, cucumber, hello);
CHECK(v == td::vector<td::string>({"AAAA", "BBBB", long_data, "CCCC"}));
}
td::Binlog::destroy(binlog_name).ignore();
}
TEST(DB, sqlite_lfs) {
td::string path = "test_sqlite_db";
td::SqliteDb::destroy(path).ignore();
auto db = td::SqliteDb::open_with_key(path, true, td::DbKey::empty()).move_as_ok();
db.exec("PRAGMA journal_mode=WAL").ensure();
db.exec("PRAGMA user_version").ensure();
td::SqliteDb::destroy(path).ignore();
}
TEST(DB, sqlite_encryption) {
td::string path = "test_sqlite_db";
td::SqliteDb::destroy(path).ignore();
auto empty = td::DbKey::empty();
auto cucumber = td::DbKey::password("cucu'\"mb er");
auto tomato = td::DbKey::raw_key(td::string(32, 'a'));
{
auto db = td::SqliteDb::open_with_key(path, true, empty).move_as_ok();
db.set_user_version(123).ensure();
auto kv = td::SqliteKeyValue();
kv.init_with_connection(db.clone(), "kv").ensure();
kv.set("a", "b");
}
td::SqliteDb::open_with_key(path, false, cucumber).ensure_error();
td::SqliteDb::change_key(path, false, cucumber, empty).ensure();
td::SqliteDb::change_key(path, false, cucumber, empty).ensure();
td::SqliteDb::open_with_key(path, false, tomato).ensure_error();
{
auto db = td::SqliteDb::open_with_key(path, false, cucumber).move_as_ok();
auto kv = td::SqliteKeyValue();
kv.init_with_connection(db.clone(), "kv").ensure();
CHECK(kv.get("a") == "b");
CHECK(db.user_version().ok() == 123);
}
td::SqliteDb::change_key(path, false, tomato, cucumber).ensure();
td::SqliteDb::change_key(path, false, tomato, cucumber).ensure();
td::SqliteDb::open_with_key(path, false, cucumber).ensure_error();
{
auto db = td::SqliteDb::open_with_key(path, false, tomato).move_as_ok();
auto kv = td::SqliteKeyValue();
kv.init_with_connection(db.clone(), "kv").ensure();
CHECK(kv.get("a") == "b");
CHECK(db.user_version().ok() == 123);
}
td::SqliteDb::change_key(path, false, empty, tomato).ensure();
td::SqliteDb::change_key(path, false, empty, tomato).ensure();
{
auto db = td::SqliteDb::open_with_key(path, false, empty).move_as_ok();
auto kv = td::SqliteKeyValue();
kv.init_with_connection(db.clone(), "kv").ensure();
CHECK(kv.get("a") == "b");
CHECK(db.user_version().ok() == 123);
}
td::SqliteDb::open_with_key(path, false, cucumber).ensure_error();
td::SqliteDb::destroy(path).ignore();
}
TEST(DB, sqlite_encryption_migrate_v3) {
td::string path = "test_sqlite_db";
td::SqliteDb::destroy(path).ignore();
auto cucumber = td::DbKey::password("cucumber");
auto empty = td::DbKey::empty();
if (false) {
// sqlite_sample_db was generated by the following code using SQLCipher based on SQLite 3.15.2
{
auto db = td::SqliteDb::change_key(path, true, cucumber, empty).move_as_ok();
db.set_user_version(123).ensure();
auto kv = td::SqliteKeyValue();
kv.init_with_connection(db.clone(), "kv").ensure();
kv.set("hello", "world");
}
LOG(ERROR) << td::base64_encode(td::read_file(path).move_as_ok());
}
td::write_file(path, td::base64_decode(td::Slice(sqlite_sample_db_v3, sqlite_sample_db_v3_size)).move_as_ok())
.ensure();
{
auto db = td::SqliteDb::open_with_key(path, true, cucumber).move_as_ok();
auto kv = td::SqliteKeyValue();
kv.init_with_connection(db.clone(), "kv").ensure();
CHECK(kv.get("hello") == "world");
CHECK(db.user_version().ok() == 123);
}
td::SqliteDb::destroy(path).ignore();
}
TEST(DB, sqlite_encryption_migrate_v4) {
td::string path = "test_sqlite_db";
td::SqliteDb::destroy(path).ignore();
auto cucumber = td::DbKey::password("cucu'\"mb er");
auto empty = td::DbKey::empty();
if (false) {
// sqlite_sample_db was generated by the following code using SQLCipher 4.4.0
{
auto db = td::SqliteDb::change_key(path, true, cucumber, empty).move_as_ok();
db.set_user_version(123).ensure();
auto kv = td::SqliteKeyValue();
kv.init_with_connection(db.clone(), "kv").ensure();
kv.set("hello", "world");
}
LOG(ERROR) << td::base64_encode(td::read_file(path).move_as_ok());
}
td::write_file(path, td::base64_decode(td::Slice(sqlite_sample_db_v4, sqlite_sample_db_v4_size)).move_as_ok())
.ensure();
{
auto r_db = td::SqliteDb::open_with_key(path, true, cucumber);
if (r_db.is_error()) {
LOG(ERROR) << r_db.error();
return;
}
auto db = r_db.move_as_ok();
auto kv = td::SqliteKeyValue();
auto status = kv.init_with_connection(db.clone(), "kv");
if (status.is_error()) {
LOG(ERROR) << status;
} else {
CHECK(kv.get("hello") == "world");
CHECK(db.user_version().ok() == 123);
}
}
td::SqliteDb::destroy(path).ignore();
}
using SeqNo = td::uint64;
struct DbQuery {
enum class Type { Get, Set, Erase, EraseBatch } type = Type::Get;
SeqNo tid = 0;
td::string key;
td::string value;
// for EraseBatch
td::vector<td::string> erased_keys;
};
static td::StringBuilder &operator<<(td::StringBuilder &string_builder, const DbQuery &query) {
string_builder << "seq_no = " << query.tid << ": ";
switch (query.type) {
case DbQuery::Type::Get:
return string_builder << "Get " << query.key << " = " << query.value;
case DbQuery::Type::Set:
return string_builder << "Set " << query.key << " = " << query.value;
case DbQuery::Type::Erase:
return string_builder << "Del " << query.key;
case DbQuery::Type::EraseBatch:
return string_builder << "Del " << query.erased_keys;
default:
UNREACHABLE();
return string_builder;
}
}
template <class ImplT>
class QueryHandler {
public:
ImplT &impl() {
return impl_;
}
void do_query(DbQuery &query) {
switch (query.type) {
case DbQuery::Type::Get:
query.value = impl_.get(query.key);
return;
case DbQuery::Type::Set:
impl_.set(query.key, query.value);
query.tid = 1;
return;
case DbQuery::Type::Erase:
impl_.erase(query.key);
query.tid = 1;
return;
case DbQuery::Type::EraseBatch:
impl_.erase_batch(query.erased_keys);
query.tid = 1;
return;
}
}
private:
ImplT impl_;
};
template <class ImplT>
class SeqQueryHandler {
public:
ImplT &impl() {
return impl_;
}
void do_query(DbQuery &query) {
switch (query.type) {
case DbQuery::Type::Get:
query.value = impl_.get(query.key);
return;
case DbQuery::Type::Set:
query.tid = impl_.set(query.key, query.value);
return;
case DbQuery::Type::Erase:
query.tid = impl_.erase(query.key);
return;
case DbQuery::Type::EraseBatch:
query.tid = impl_.erase_batch(query.erased_keys);
return;
}
}
private:
ImplT impl_;
};
class SqliteKV {
public:
td::string get(const td::string &key) {
return kv_->get().get(key);
}
SeqNo set(const td::string &key, const td::string &value) {
kv_->get().set(key, value);
return 0;
}
SeqNo erase(const td::string &key) {
kv_->get().erase(key);
return 0;
}
SeqNo erase_batch(td::vector<td::string> keys) {
for (auto &key : keys) {
kv_->get().erase(key);
}
return 0;
}
td::Status init(const td::string &name) {
auto sql_connection = std::make_shared<td::SqliteConnectionSafe>(name, td::DbKey::empty());
kv_ = std::make_shared<td::SqliteKeyValueSafe>("kv", sql_connection);
return td::Status::OK();
}
void close() {
kv_.reset();
}
private:
std::shared_ptr<td::SqliteKeyValueSafe> kv_;
};
class BaselineKV {
public:
td::string get(const td::string &key) {
return map_[key];
}
SeqNo set(const td::string &key, td::string value) {
map_[key] = std::move(value);
return ++current_tid_;
}
SeqNo erase(const td::string &key) {
map_.erase(key);
return ++current_tid_;
}
SeqNo erase_batch(td::vector<td::string> keys) {
for (auto &key : keys) {
map_.erase(key);
}
SeqNo result = current_tid_ + 1;
current_tid_ += map_.size();
return result;
}
private:
std::map<td::string, td::string> map_;
SeqNo current_tid_ = 0;
};
TEST(DB, key_value) {
td::vector<td::string> keys;
td::vector<td::string> values;
for (int i = 0; i < 100; i++) {
keys.push_back(td::rand_string('a', 'b', td::Random::fast(1, 10)));
}
for (int i = 0; i < 10; i++) {
values.push_back(td::rand_string('a', 'b', td::Random::fast(1, 10)));
}
int queries_n = 1000;
td::vector<DbQuery> queries(queries_n);
for (auto &q : queries) {
int op = td::Random::fast(0, 3);
const auto &key = rand_elem(keys);
if (op == 0) {
q.type = DbQuery::Type::Get;
q.key = key;
} else if (op == 1) {
q.type = DbQuery::Type::Erase;
q.key = key;
} else if (op == 2) {
q.type = DbQuery::Type::Set;
q.key = key;
q.value = rand_elem(values);
} else if (op == 3) {
q.type = DbQuery::Type::EraseBatch;
q.erased_keys.resize(td::Random::fast(0, 3));
for (auto &erased_key : q.erased_keys) {
erased_key = rand_elem(keys);
}
}
}
QueryHandler<BaselineKV> baseline;
QueryHandler<td::SeqKeyValue> kv;
QueryHandler<td::TsSeqKeyValue> ts_kv;
QueryHandler<td::BinlogKeyValue<td::Binlog>> new_kv;
td::CSlice new_kv_name = "test_new_kv";
td::Binlog::destroy(new_kv_name).ignore();
new_kv.impl().init(new_kv_name.str()).ensure();
QueryHandler<td::SqliteKeyValue> sqlite_kv;
td::CSlice path = "test_sqlite_kv";
td::SqliteDb::destroy(path).ignore();
auto db = td::SqliteDb::open_with_key(path, true, td::DbKey::empty()).move_as_ok();
sqlite_kv.impl().init_with_connection(std::move(db), "KV").ensure();
int cnt = 0;
for (auto &q : queries) {
DbQuery a = q;
DbQuery b = q;
DbQuery c = q;
DbQuery d = q;
DbQuery e = q;
baseline.do_query(a);
kv.do_query(b);
ts_kv.do_query(c);
sqlite_kv.do_query(d);
new_kv.do_query(e);
ASSERT_EQ(a.value, b.value);
ASSERT_EQ(a.value, c.value);
ASSERT_EQ(a.value, d.value);
ASSERT_EQ(a.value, e.value);
if (cnt++ % 200 == 0) {
new_kv.impl().init(new_kv_name.str()).ensure();
}
}
td::SqliteDb::destroy(path).ignore();
td::Binlog::destroy(new_kv_name).ignore();
}
TEST(DB, key_value_set_all) {
td::vector<td::string> keys;
td::vector<td::string> values;
for (int i = 0; i < 100; i++) {
keys.push_back(td::rand_string('a', 'b', td::Random::fast(1, 10)));
}
for (int i = 0; i < 10; i++) {
values.push_back(td::rand_string('a', 'b', td::Random::fast(1, 10)));
}
td::SqliteKeyValue sqlite_kv;
td::CSlice sqlite_kv_name = "test_sqlite_kv";
td::SqliteDb::destroy(sqlite_kv_name).ignore();
auto db = td::SqliteDb::open_with_key(sqlite_kv_name, true, td::DbKey::empty()).move_as_ok();
sqlite_kv.init_with_connection(std::move(db), "KV").ensure();
BaselineKV kv;
int queries_n = 100;
while (queries_n-- > 0) {
int cnt = td::Random::fast(0, 10);
td::FlatHashMap<td::string, td::string> key_values;
for (int i = 0; i < cnt; i++) {
auto key = rand_elem(keys);
auto value = rand_elem(values);
key_values[key] = value;
kv.set(key, value);
}
sqlite_kv.set_all(key_values);
for (auto &key : keys) {
CHECK(kv.get(key) == sqlite_kv.get(key));
}
}
td::SqliteDb::destroy(sqlite_kv_name).ignore();
}
#if !TD_THREAD_UNSUPPORTED
TEST(DB, thread_key_value) {
td::vector<td::string> keys;
td::vector<td::string> values;
for (int i = 0; i < 100; i++) {
keys.push_back(td::rand_string('a', 'b', td::Random::fast(1, 10)));
}
for (int i = 0; i < 1000; i++) {
values.push_back(td::rand_string('a', 'b', td::Random::fast(1, 10)));
}
int threads_n = 4;
int queries_n = 10000;
td::vector<td::vector<DbQuery>> queries(threads_n, td::vector<DbQuery>(queries_n));
for (auto &qs : queries) {
for (auto &q : qs) {
int op = td::Random::fast(0, 10);
const auto &key = rand_elem(keys);
if (op == 0) {
q.type = DbQuery::Type::Erase;
q.key = key;
} else if (op == 1) {
q.type = DbQuery::Type::EraseBatch;
q.erased_keys.resize(td::Random::fast(0, 3));
for (auto &erased_key : q.erased_keys) {
erased_key = rand_elem(keys);
}
} else if (op <= 6) {
q.type = DbQuery::Type::Set;
q.key = key;
q.value = rand_elem(values);
} else {
q.type = DbQuery::Type::Get;
q.key = key;
}
}
}
QueryHandler<BaselineKV> baseline;
SeqQueryHandler<td::TsSeqKeyValue> ts_kv;
td::vector<td::thread> threads(threads_n);
td::vector<td::vector<DbQuery>> res(threads_n);
for (int i = 0; i < threads_n; i++) {
threads[i] = td::thread([&ts_kv, &queries, &res, i] {
for (auto q : queries[i]) {
ts_kv.do_query(q);
res[i].push_back(q);
}
});
}
for (auto &thread : threads) {
thread.join();
}
td::vector<std::size_t> pos(threads_n);
while (true) {
bool was = false;
for (int i = 0; i < threads_n; i++) {
auto p = pos[i];
if (p == res[i].size()) {
continue;
}
auto &q = res[i][p];
if (q.tid == 0) {
if (q.type == DbQuery::Type::Get) {
auto nq = q;
baseline.do_query(nq);
if (nq.value == q.value) {
was = true;
pos[i]++;
}
} else {
was = true;
pos[i]++;
}
}
}
if (was) {
continue;
}
int best = -1;
SeqNo best_tid = 0;
for (int i = 0; i < threads_n; i++) {
auto p = pos[i];
if (p == res[i].size()) {
continue;
}
was = true;
auto &q = res[i][p];
if (q.tid != 0) {
if (best == -1 || q.tid < best_tid) {
best = i;
best_tid = q.tid;
}
}
}
if (!was) {
break;
}
ASSERT_TRUE(best != -1);
baseline.do_query(res[best][pos[best]]);
pos[best]++;
}
}
#endif
TEST(DB, persistent_key_value) {
using KeyValue = td::BinlogKeyValue<td::ConcurrentBinlog>;
// using KeyValue = td::SqliteKeyValue;
td::vector<td::string> keys;
td::vector<td::string> values;
td::CSlice path = "test_pmc";
td::Binlog::destroy(path).ignore();
td::SqliteDb::destroy(path).ignore();
for (int i = 0; i < 100; i++) {
keys.push_back(td::rand_string('a', 'b', td::Random::fast(1, 10)));
}
for (int i = 0; i < 1000; i++) {
values.push_back(td::rand_string('a', 'b', td::Random::fast(1, 10)));
}
QueryHandler<BaselineKV> baseline;
for (int iter = 0; iter < 25; iter++) {
int threads_n = 4;
int queries_n = 3000 / threads_n;
td::vector<td::vector<DbQuery>> queries(threads_n, td::vector<DbQuery>(queries_n));
for (auto &qs : queries) {
for (auto &q : qs) {
int op = td::Random::fast(0, 10);
const auto &key = rand_elem(keys);
if (op == 0) {
q.type = DbQuery::Type::Erase;
q.key = key;
} else if (op == 1) {
q.type = DbQuery::Type::EraseBatch;
q.erased_keys.resize(td::Random::fast(0, 3));
for (auto &erased_key : q.erased_keys) {
erased_key = rand_elem(keys);
}
} else if (op <= 6) {
q.type = DbQuery::Type::Set;
q.key = key;
q.value = rand_elem(values);
} else {
q.type = DbQuery::Type::Get;
q.key = key;
}
}
}
td::vector<td::vector<DbQuery>> res(threads_n);
class Worker final : public td::Actor {
public:
Worker(td::ActorShared<> parent, std::shared_ptr<SeqQueryHandler<KeyValue>> kv,
const td::vector<DbQuery> *queries, td::vector<DbQuery> *res)
: parent_(std::move(parent)), kv_(std::move(kv)), queries_(queries), res_(res) {
}
void loop() final {
for (auto q : *queries_) {
kv_->do_query(q);
res_->push_back(q);
}
stop();
}
private:
td::ActorShared<> parent_;
std::shared_ptr<SeqQueryHandler<KeyValue>> kv_;
const td::vector<DbQuery> *queries_;
td::vector<DbQuery> *res_;
};
class Main final : public td::Actor {
public:
Main(int threads_n, const td::vector<td::vector<DbQuery>> *queries, td::vector<td::vector<DbQuery>> *res)
: threads_n_(threads_n), queries_(queries), res_(res), ref_cnt_(threads_n) {
}
void start_up() final {
LOG(INFO) << "Start up";
kv_->impl().init("test_pmc").ensure();
for (int i = 0; i < threads_n_; i++) {
td::create_actor_on_scheduler<Worker>("Worker", i + 1, actor_shared(this, 2), kv_, &queries_->at(i),
&res_->at(i))
.release();
}
}
void tear_down() final {
LOG(INFO) << "Tear down";
// kv_->impl().close();
}
void hangup_shared() final {
LOG(INFO) << "Hang up";
ref_cnt_--;
if (ref_cnt_ == 0) {
kv_->impl().close();
td::Scheduler::instance()->finish();
stop();
}
}
void hangup() final {
LOG(ERROR) << "BAD HANGUP";
}
private:
int threads_n_;
const td::vector<td::vector<DbQuery>> *queries_;
td::vector<td::vector<DbQuery>> *res_;
std::shared_ptr<SeqQueryHandler<KeyValue>> kv_{new SeqQueryHandler<KeyValue>()};
int ref_cnt_;
};
td::ConcurrentScheduler sched(threads_n, 0);
sched.create_actor_unsafe<Main>(0, "Main", threads_n, &queries, &res).release();
sched.start();
while (sched.run_main(10)) {
// empty
}
sched.finish();
td::vector<std::size_t> pos(threads_n);
while (true) {
bool was = false;
for (int i = 0; i < threads_n; i++) {
auto p = pos[i];
if (p == res[i].size()) {
continue;
}
auto &q = res[i][p];
if (q.tid == 0) {
if (q.type == DbQuery::Type::Get) {
auto nq = q;
baseline.do_query(nq);
if (nq.value == q.value) {
was = true;
pos[i]++;
}
} else {
was = true;
pos[i]++;
}
}
}
if (was) {
continue;
}
LOG(DEBUG) << pos;
int best = -1;
SeqNo best_tid = 0;
for (int i = 0; i < threads_n; i++) {
auto p = pos[i];
if (p == res[i].size()) {
continue;
}
was = true;
auto &q = res[i][p];
LOG(DEBUG) << i << ' ' << p << ' ' << q;
if (q.tid != 0) {
if (best == -1 || q.tid < best_tid) {
best = i;
best_tid = q.tid;
}
}
}
if (!was) {
break;
}
ASSERT_TRUE(best != -1);
baseline.do_query(res[best][pos[best]]);
pos[best]++;
}
}
td::SqliteDb::destroy(path).ignore();
}