134 lines
4.1 KiB
C++
134 lines
4.1 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
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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/db/SqliteKeyValue.h"
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#include "td/utils/ScopeGuard.h"
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namespace td {
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Result<bool> SqliteKeyValue::init(string path) {
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path_ = std::move(path);
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bool is_created = false;
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SqliteDb db;
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TRY_STATUS(db.init(path, &is_created));
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TRY_STATUS(db.exec("PRAGMA encoding=\"UTF-8\""));
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TRY_STATUS(db.exec("PRAGMA synchronous=NORMAL"));
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TRY_STATUS(db.exec("PRAGMA journal_mode=WAL"));
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TRY_STATUS(db.exec("PRAGMA temp_store=MEMORY"));
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TRY_STATUS(init_with_connection(std::move(db), "KV"));
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return is_created;
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}
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Status SqliteKeyValue::init_with_connection(SqliteDb connection, string table_name) {
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auto init_guard = ScopeExit() + [&]() { close(); };
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db_ = std::move(connection);
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table_name_ = std::move(table_name);
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TRY_STATUS(init(db_, table_name_));
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TRY_RESULT(set_stmt, db_.get_statement(PSLICE() << "REPLACE INTO " << table_name_ << " (k, v) VALUES (?1, ?2)"));
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set_stmt_ = std::move(set_stmt);
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TRY_RESULT(get_stmt, db_.get_statement(PSLICE() << "SELECT v FROM " << table_name_ << " WHERE k = ?1"));
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get_stmt_ = std::move(get_stmt);
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TRY_RESULT(erase_stmt, db_.get_statement(PSLICE() << "DELETE FROM " << table_name_ << " WHERE k = ?1"));
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erase_stmt_ = std::move(erase_stmt);
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TRY_RESULT(get_all_stmt, db_.get_statement(PSLICE() << "SELECT k, v FROM " << table_name_));
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get_all_stmt_ = std::move(get_all_stmt);
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TRY_RESULT(erase_by_prefix_stmt,
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db_.get_statement(PSLICE() << "DELETE FROM " << table_name_ << " WHERE ?1 <= k AND k < ?2"));
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erase_by_prefix_stmt_ = std::move(erase_by_prefix_stmt);
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TRY_RESULT(erase_by_prefix_rare_stmt,
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db_.get_statement(PSLICE() << "DELETE FROM " << table_name_ << " WHERE ?1 <= k"));
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erase_by_prefix_rare_stmt_ = std::move(erase_by_prefix_rare_stmt);
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TRY_RESULT(get_by_prefix_stmt,
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db_.get_statement(PSLICE() << "SELECT k, v FROM " << table_name_ << " WHERE ?1 <= k AND k < ?2"));
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get_by_prefix_stmt_ = std::move(get_by_prefix_stmt);
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TRY_RESULT(get_by_prefix_rare_stmt,
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db_.get_statement(PSLICE() << "SELECT k, v FROM " << table_name_ << " WHERE ?1 <= k"));
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get_by_prefix_rare_stmt_ = std::move(get_by_prefix_rare_stmt);
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init_guard.dismiss();
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return Status::OK();
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}
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Status SqliteKeyValue::drop() {
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if (empty()) {
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return Status::OK();
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}
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auto result = drop(db_, table_name_);
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close();
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return result;
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}
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SqliteKeyValue::SeqNo SqliteKeyValue::set(Slice key, Slice value) {
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set_stmt_.bind_blob(1, key).ensure();
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set_stmt_.bind_blob(2, value).ensure();
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set_stmt_.step().ensure();
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set_stmt_.reset();
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return 0;
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}
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string SqliteKeyValue::get(Slice key) {
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SCOPE_EXIT {
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get_stmt_.reset();
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};
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get_stmt_.bind_blob(1, key).ensure();
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get_stmt_.step().ensure();
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if (!get_stmt_.has_row()) {
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return "";
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}
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auto data = get_stmt_.view_blob(0).str();
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get_stmt_.step().ignore();
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return data;
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}
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SqliteKeyValue::SeqNo SqliteKeyValue::erase(Slice key) {
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erase_stmt_.bind_blob(1, key).ensure();
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erase_stmt_.step().ensure();
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erase_stmt_.reset();
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return 0;
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}
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void SqliteKeyValue::erase_by_prefix(Slice prefix) {
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auto next = next_prefix(prefix);
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if (next.empty()) {
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SCOPE_EXIT {
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erase_by_prefix_rare_stmt_.reset();
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};
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erase_by_prefix_rare_stmt_.bind_blob(1, prefix).ensure();
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erase_by_prefix_rare_stmt_.step().ensure();
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} else {
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SCOPE_EXIT {
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erase_by_prefix_stmt_.reset();
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};
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erase_by_prefix_stmt_.bind_blob(1, prefix).ensure();
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erase_by_prefix_stmt_.bind_blob(2, next).ensure();
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erase_by_prefix_stmt_.step().ensure();
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}
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}
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string SqliteKeyValue::next_prefix(Slice prefix) {
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string next = prefix.str();
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size_t pos = next.size();
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while (pos) {
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pos--;
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auto value = static_cast<uint8>(next[pos]);
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value++;
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next[pos] = static_cast<char>(value);
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if (value != 0) {
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return next;
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}
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}
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return string{};
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}
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} // namespace td
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