01599ffbae
Support to delete multiple keys in one DEL command. The feature of returning number of the really deleted keys is still not supported. Return empty string to client for GET command when the required key is not exists. Fixes: #5334 Signed-off-by: Peng Jian <pengjian.uestc@gmail.com>
118 lines
4.3 KiB
C++
118 lines
4.3 KiB
C++
/*
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* Copyright (C) 2019 pengjian.uestc @ gmail.com
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "bytes.hh"
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#include "seastar/core/sharded.hh"
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#include "seastar/core/shared_ptr.hh"
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#include <seastar/core/print.hh>
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#include "seastar/core/scattered_message.hh"
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#include "redis/exceptions.hh"
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using namespace seastar;
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namespace redis {
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class redis_message final {
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seastar::lw_shared_ptr<scattered_message<char>> _message;
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public:
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redis_message() = delete;
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redis_message(const redis_message&) = delete;
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redis_message& operator=(const redis_message&) = delete;
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redis_message(redis_message&& o) noexcept : _message(std::move(o._message)) {}
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redis_message(lw_shared_ptr<scattered_message<char>> m) noexcept : _message(m) {}
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static future<redis_message> ok() {
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auto m = make_lw_shared<scattered_message<char>> ();
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m->append_static("+OK\r\n");
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return make_ready_future<redis_message>(m);
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}
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static future<redis_message> pong() {
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auto m = make_lw_shared<scattered_message<char>> ();
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m->append_static("+PONG\r\n");
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return make_ready_future<redis_message>(m);
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}
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static future<redis_message> zero() {
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auto m = make_lw_shared<scattered_message<char>> ();
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m->append_static(":0\r\n");
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return make_ready_future<redis_message>(m);
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}
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static future<redis_message> one() {
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auto m = make_lw_shared<scattered_message<char>> ();
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m->append_static(":1\r\n");
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return make_ready_future<redis_message>(m);
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}
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static future<redis_message> nil() {
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auto m = make_lw_shared<scattered_message<char>> ();
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m->append_static("$-1\r\n");
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return make_ready_future<redis_message>(m);
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}
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static future<redis_message> err() {
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return zero();
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}
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static future<redis_message> number(size_t n) {
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auto m = make_lw_shared<scattered_message<char>> ();
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m->append(sstring(sprint(":%zu\r\n", n)));
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return make_ready_future<redis_message>(m);
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}
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static future<redis_message> make_strings_result(bytes result) {
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auto m = make_lw_shared<scattered_message<char>> ();
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write_bytes(m, result);
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return make_ready_future<redis_message>(m);
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}
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static future<redis_message> unknown(const bytes& name) {
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return from_exception(make_message("-ERR unknown command '%s'\r\n", to_sstring(name)));
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}
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static future<redis_message> exception(const sstring& em) {
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auto m = make_lw_shared<scattered_message<char>> ();
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m->append(make_message("-ERR %s\r\n", em));
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return make_ready_future<redis_message>(m);
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}
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static future<redis_message> exception(const redis_exception& e) {
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return exception(e.what_message());
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}
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inline lw_shared_ptr<scattered_message<char>> message() { return _message; }
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private:
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static future<redis_message> from_exception(sstring data) {
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auto m = make_lw_shared<scattered_message<char>> ();
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m->append(data);
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return make_ready_future<redis_message>(m);
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}
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template<typename... Args>
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static inline sstring make_message(const char* fmt, Args&&... args) noexcept {
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try {
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return sprint(fmt, std::forward<Args>(args)...);
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} catch (...) {
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return sstring();
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}
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}
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static sstring to_sstring(const bytes& b) {
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return sstring(reinterpret_cast<const char*>(b.data()), b.size());
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}
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static void write_bytes(lw_shared_ptr<scattered_message<char>> m, bytes& b) {
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m->append(sstring(sprint("$%d\r\n", b.size())));
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m->append(sstring(reinterpret_cast<const char*>(b.data()), b.size()));
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m->append_static("\r\n");
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}
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};
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}
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