0737d9e84d
Scylla has advantage and amazing features. If Redis build on the top of Scylla, it has the above features automatically. It's achived great progress in cluster master managment, data persistence, failover and replication. The benefits to the users are easy to use and develop in their production environment, and taking avantages of Scylla. Using the Ragel to parse the Redis request, server abtains the command name and the parameters from the request, invokes the Scylla's internal API to read and write the data, then replies to client. Signed-off-by: Peng Jian, <pengjian.uestc@gmail.com>
142 lines
3.2 KiB
Ragel
142 lines
3.2 KiB
Ragel
/*
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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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#include <memory>
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#include <iostream>
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#include <algorithm>
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#include <functional>
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#include "bytes.hh"
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#include "redis/request.hh"
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#include <seastar/core/ragel.hh>
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using namespace seastar;
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using namespace redis;
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%%{
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machine redis_resp_protocol;
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access _fsm_;
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action mark {
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g.mark_start(p);
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}
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action start_blob {
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g.mark_start(p);
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_size_left = _arg_size;
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}
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action start_command {
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g.mark_start(p);
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_size_left = _arg_size;
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}
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action advance_blob {
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auto len = std::min(static_cast<uint32_t>(pe - p), _size_left);
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_size_left -= len;
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p += len;
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if (_size_left == 0) {
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_req._args.push_back(str());
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p--;
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fret;
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}
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p--;
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}
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action advance_command {
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auto len = std::min(static_cast<uint32_t>(pe - p), _size_left);
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_size_left -= len;
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p += len;
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if (_size_left == 0) {
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_req._command = str();
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p--;
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fret;
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}
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p--;
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}
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crlf = '\r\n';
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u32 = digit+ >{ _u32 = 0;} ${ _u32 *= 10; _u32 += fc - '0';};
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args_count = '*' u32 crlf ${_req._args_count = _u32 - 1;};
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blob := any+ >start_blob $advance_blob;
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command := any+ >start_command $advance_command;
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arg = '$' u32 crlf ${ _arg_size = _u32;};
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main := (args_count (arg @{fcall command; } crlf) (arg @{fcall blob; } crlf)+) ${_req._state = request_state::ok;};
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prepush {
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prepush();
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}
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postpop {
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postpop();
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}
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}%%
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class redis_protocol_parser : public ragel_parser_base<redis_protocol_parser> {
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%% write data nofinal noprefix;
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public:
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redis::request _req;
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uint32_t _u32;
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uint32_t _arg_size;
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uint32_t _size_left;
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public:
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virtual void init() {
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init_base();
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_req._state = request_state::error;
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_req._args.clear();
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_req._args_count = 0;
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_size_left = 0;
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_arg_size = 0;
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%% write init;
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}
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char* parse(char* p, char* pe, char* eof) {
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sstring_builder::guard g(_builder, p, pe);
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auto str = [this, &g, &p] {
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g.mark_end(p);
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auto s = get_str();
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return to_bytes(s);
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};
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%% write exec;
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if (_req._state != request_state::error) {
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return p;
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}
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if (p != pe) {
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p = pe;
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return p;
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}
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return nullptr;
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}
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bool eof() const {
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return _req._state == request_state::eof;
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}
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redis::request& get_request() {
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std::transform(_req._command.begin(), _req._command.end(), _req._command.begin(), ::tolower);
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return _req;
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}
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};
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