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/*
* This file is open source software, licensed to you under the terms
* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. You may not use this file except in compliance with the License.
*
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/*
* Copyright (C) 2014 Cloudius Systems, Ltd.
*/
#include <seastar/core/ragel.hh>
#include "memcached.hh"
#include <memory>
#include <algorithm>
#include <functional>
using namespace seastar;
%%{
machine memcache_ascii_protocol;
access _fsm_;
action mark {
g.mark_start(p);
}
action start_blob {
g.mark_start(p);
_size_left = _size;
}
action advance_blob {
auto len = std::min((uint32_t)(pe - p), _size_left);
_size_left -= len;
p += len;
if (_size_left == 0) {
_blob = str();
p--;
fret;
}
p--;
}
crlf = '\r\n';
sp = ' ';
u32 = digit+ >{ _u32 = 0; } ${ _u32 *= 10; _u32 += fc - '0'; };
u64 = digit+ >{ _u64 = 0; } ${ _u64 *= 10; _u64 += fc - '0'; };
key = [^ ]+ >mark %{ _key = memcache::item_key(str()); };
flags = digit+ >mark %{ _flags_str = str(); };
expiration = u32 %{ _expiration = _u32; };
size = u32 >mark %{ _size = _u32; _size_str = str(); };
blob := any+ >start_blob $advance_blob;
maybe_noreply = (sp "noreply" @{ _noreply = true; })? >{ _noreply = false; };
maybe_expiration = (sp expiration)? >{ _expiration = 0; };
version_field = u64 %{ _version = _u64; };
insertion_params = sp key sp flags sp expiration sp size maybe_noreply (crlf @{ fcall blob; } ) crlf;
set = "set" insertion_params @{ _state = state::cmd_set; };
add = "add" insertion_params @{ _state = state::cmd_add; };
replace = "replace" insertion_params @{ _state = state::cmd_replace; };
cas = "cas" sp key sp flags sp expiration sp size sp version_field maybe_noreply (crlf @{ fcall blob; } ) crlf @{ _state = state::cmd_cas; };
get = "get" (sp key %{ _keys.emplace_back(std::move(_key)); })+ crlf @{ _state = state::cmd_get; };
gets = "gets" (sp key %{ _keys.emplace_back(std::move(_key)); })+ crlf @{ _state = state::cmd_gets; };
delete = "delete" sp key maybe_noreply crlf @{ _state = state::cmd_delete; };
flush = "flush_all" maybe_expiration maybe_noreply crlf @{ _state = state::cmd_flush_all; };
version = "version" crlf @{ _state = state::cmd_version; };
stats = "stats" crlf @{ _state = state::cmd_stats; };
stats_hash = "stats hash" crlf @{ _state = state::cmd_stats_hash; };
incr = "incr" sp key sp u64 maybe_noreply crlf @{ _state = state::cmd_incr; };
decr = "decr" sp key sp u64 maybe_noreply crlf @{ _state = state::cmd_decr; };
main := (add | replace | set | get | gets | delete | flush | version | cas | stats | incr | decr
| stats_hash) >eof{ _state = state::eof; };
prepush {
prepush();
}
postpop {
postpop();
}
}%%
class memcache_ascii_parser : public ragel_parser_base<memcache_ascii_parser> {
%% write data nofinal noprefix;
public:
enum class state {
error,
eof,
cmd_set,
cmd_cas,
cmd_add,
cmd_replace,
cmd_get,
cmd_gets,
cmd_delete,
cmd_flush_all,
cmd_version,
cmd_stats,
cmd_stats_hash,
cmd_incr,
cmd_decr,
};
state _state;
uint32_t _u32;
uint64_t _u64;
memcache::item_key _key;
sstring _flags_str;
uint32_t _expiration;
uint32_t _size;
sstring _size_str;
uint32_t _size_left;
uint64_t _version;
sstring _blob;
bool _noreply;
std::vector<memcache::item_key> _keys;
public:
void init() {
init_base();
_state = state::error;
_keys.clear();
%% write init;
}
char* parse(char* p, char* pe, char* eof) {
sstring_builder::guard g(_builder, p, pe);
auto str = [this, &g, &p] { g.mark_end(p); return get_str(); };
%% write exec;
if (_state != state::error) {
return p;
}
if (p != pe) {
p = pe;
return p;
}
return nullptr;
}
bool eof() const {
return _state == state::eof;
}
};
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