118 lines
3.5 KiB
C++
118 lines
3.5 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include "td/telegram/HashtagHints.h"
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#include "td/telegram/Global.h"
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#include "td/telegram/TdDb.h"
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#include "td/db/SqliteKeyValueAsync.h"
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#include "td/utils/logging.h"
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#include "td/utils/tl_helpers.h"
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#include "td/utils/utf8.h"
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#include <functional>
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namespace td {
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HashtagHints::HashtagHints(string mode, ActorShared<> parent) : mode_(std::move(mode)), parent_(std::move(parent)) {
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}
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void HashtagHints::start_up() {
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if (G()->parameters().use_file_db) { // TODO hashtag hints should not depend on use_file_db
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G()->td_db()->get_sqlite_pmc()->get(get_key(),
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PromiseCreator::lambda([actor_id = actor_id(this)](Result<string> res) {
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send_closure(actor_id, &HashtagHints::from_db, std::move(res), false);
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}));
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}
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}
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void HashtagHints::hashtag_used(const string &hashtag) {
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if (!sync_with_db_) {
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return;
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}
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hashtag_used_impl(hashtag);
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G()->td_db()->get_sqlite_pmc()->set(get_key(), serialize(keys_to_strings(hints_.search_empty(101).second)),
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Promise<>());
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}
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void HashtagHints::remove_hashtag(string hashtag, Promise<> promise) {
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if (!sync_with_db_) {
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promise.set_value(Unit());
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return;
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}
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if (hashtag[0] == '#') {
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hashtag = hashtag.substr(1);
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}
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auto key = std::hash<std::string>()(hashtag);
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if (hints_.has_key(key)) {
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hints_.remove(key);
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G()->td_db()->get_sqlite_pmc()->set(get_key(), serialize(keys_to_strings(hints_.search_empty(101).second)),
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Promise<>());
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promise.set_value(Unit()); // set promise explicitly, because sqlite_pmc waits for too long before setting promise
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} else {
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promise.set_value(Unit());
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}
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}
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void HashtagHints::query(const string &prefix, int32 limit, Promise<std::vector<string>> promise) {
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if (!sync_with_db_) {
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promise.set_value(std::vector<string>());
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return;
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}
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auto result = prefix.empty() ? hints_.search_empty(limit) : hints_.search(prefix, limit);
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promise.set_value(keys_to_strings(result.second));
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}
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string HashtagHints::get_key() const {
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return "hashtag_hints#" + mode_;
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}
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void HashtagHints::hashtag_used_impl(const string &hashtag) {
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if (!check_utf8(hashtag)) {
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LOG(ERROR) << "Trying to add invalid UTF-8 hashtag \"" << hashtag << '"';
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return;
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}
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// TODO: may be it should be optimized a little
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auto key = std::hash<std::string>()(hashtag);
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hints_.add(key, hashtag);
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hints_.set_rating(key, -++counter_);
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}
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void HashtagHints::from_db(Result<string> data, bool dummy) {
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if (G()->close_flag()) {
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return;
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}
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sync_with_db_ = true;
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if (data.is_error() || data.ok().empty()) {
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return;
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}
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std::vector<string> hashtags;
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auto status = unserialize(hashtags, data.ok());
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if (status.is_error()) {
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LOG(ERROR) << "Failed to unserialize hashtag hints: " << status;
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return;
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}
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for (auto it = hashtags.rbegin(); it != hashtags.rend(); ++it) {
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hashtag_used_impl(*it);
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}
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}
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std::vector<string> HashtagHints::keys_to_strings(const std::vector<int64> &keys) {
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std::vector<string> result;
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result.reserve(keys.size());
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for (auto &it : keys) {
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result.push_back(hints_.key_to_string(it));
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}
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return result;
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}
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} // namespace td
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