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//
// 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 "td/db/SqliteKeyValueAsync.h"
#include "td/db/SqliteKeyValue.h"
#include "td/actor/actor.h"
#include "td/utils/common.h"
#include "td/utils/optional.h"
#include "td/utils/Time.h"
namespace td {
class SqliteKeyValueAsync final : public SqliteKeyValueAsyncInterface {
public:
explicit SqliteKeyValueAsync(std::shared_ptr<SqliteKeyValueSafe> kv_safe, int32 scheduler_id = -1) {
impl_ = create_actor_on_scheduler<Impl>("KV", scheduler_id, std::move(kv_safe));
}
void set(string key, string value, Promise<Unit> promise) final {
send_closure_later(impl_, &Impl::set, std::move(key), std::move(value), std::move(promise));
}
void set_all(FlatHashMap<string, string> key_values, Promise<Unit> promise) final {
send_closure_later(impl_, &Impl::set_all, std::move(key_values), std::move(promise));
}
void erase(string key, Promise<Unit> promise) final {
send_closure_later(impl_, &Impl::erase, std::move(key), std::move(promise));
}
void erase_by_prefix(string key_prefix, Promise<Unit> promise) final {
send_closure_later(impl_, &Impl::erase_by_prefix, std::move(key_prefix), std::move(promise));
}
void get(string key, Promise<string> promise) final {
send_closure_later(impl_, &Impl::get, std::move(key), std::move(promise));
}
void close(Promise<Unit> promise) final {
send_closure_later(impl_, &Impl::close, std::move(promise));
}
private:
class Impl final : public Actor {
public:
explicit Impl(std::shared_ptr<SqliteKeyValueSafe> kv_safe) : kv_safe_(std::move(kv_safe)) {
}
void set(string key, string value, Promise<Unit> promise) {
auto it = buffer_.find(key);
if (it != buffer_.end()) {
it->second = std::move(value);
} else {
CHECK(!key.empty());
buffer_.emplace(std::move(key), std::move(value));
}
if (promise) {
buffer_promises_.push_back(std::move(promise));
}
cnt_++;
do_flush(false /*force*/);
}
void set_all(FlatHashMap<string, string> key_values, Promise<Unit> promise) {
do_flush(true /*force*/);
kv_->set_all(key_values);
promise.set_value(Unit());
}
void erase(string key, Promise<Unit> promise) {
auto it = buffer_.find(key);
if (it != buffer_.end()) {
it->second = optional<string>();
} else {
CHECK(!key.empty());
buffer_.emplace(std::move(key), optional<string>());
}
if (promise) {
buffer_promises_.push_back(std::move(promise));
}
cnt_++;
do_flush(false /*force*/);
}
void erase_by_prefix(string key_prefix, Promise<Unit> promise) {
do_flush(true /*force*/);
kv_->erase_by_prefix(key_prefix);
promise.set_value(Unit());
}
void get(const string &key, Promise<string> promise) {
auto it = buffer_.find(key);
if (it != buffer_.end()) {
return promise.set_value(it->second ? it->second.value() : "");
}
promise.set_value(kv_->get(key));
}
void close(Promise<Unit> promise) {
do_flush(true /*force*/);
kv_safe_.reset();
kv_ = nullptr;
stop();
promise.set_value(Unit());
}
private:
std::shared_ptr<SqliteKeyValueSafe> kv_safe_;
SqliteKeyValue *kv_ = nullptr;
static constexpr double MAX_PENDING_QUERIES_DELAY = 0.01;
static constexpr size_t MAX_PENDING_QUERIES_COUNT = 100;
FlatHashMap<string, optional<string>> buffer_;
vector<Promise<Unit>> buffer_promises_;
size_t cnt_ = 0;
double wakeup_at_ = 0;
void do_flush(bool force) {
if (buffer_.empty()) {
return;
}
if (!force) {
auto now = Time::now_cached();
if (wakeup_at_ == 0) {
wakeup_at_ = now + MAX_PENDING_QUERIES_DELAY;
}
if (now < wakeup_at_ && cnt_ < MAX_PENDING_QUERIES_COUNT) {
set_timeout_at(wakeup_at_);
return;
}
}
wakeup_at_ = 0;
cnt_ = 0;
kv_->begin_write_transaction().ensure();
for (auto &it : buffer_) {
if (it.second) {
kv_->set(it.first, it.second.value());
} else {
kv_->erase(it.first);
}
}
kv_->commit_transaction().ensure();
buffer_.clear();
set_promises(buffer_promises_);
}
void timeout_expired() final {
do_flush(false /*force*/);
}
void start_up() final {
kv_ = &kv_safe_->get();
}
};
ActorOwn<Impl> impl_;
};
unique_ptr<SqliteKeyValueAsyncInterface> create_sqlite_key_value_async(std::shared_ptr<SqliteKeyValueSafe> kv,
int32 scheduler_id) {
return td::make_unique<SqliteKeyValueAsync>(std::move(kv), scheduler_id);
}
} // namespace td
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