130 lines
3.7 KiB
C++
130 lines
3.7 KiB
C++
/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2015 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef SHRPX_MEMCACHED_CONNECTION_H
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#define SHRPX_MEMCACHED_CONNECTION_H
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#include "shrpx.h"
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#include <memory>
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#include <deque>
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#include <ev.h>
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#include "shrpx_connection.h"
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#include "buffer.h"
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using namespace nghttp2;
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namespace shrpx {
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struct MemcachedRequest;
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struct Address;
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enum {
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MEMCACHED_PARSE_HEADER24,
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MEMCACHED_PARSE_EXTRA,
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MEMCACHED_PARSE_VALUE,
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};
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// Stores state when parsing response from memcached server
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struct MemcachedParseState {
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// Buffer for value, dynamically allocated.
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std::vector<uint8_t> value;
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// cas in response
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uint64_t cas;
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// keylen in response
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size_t keylen;
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// extralen in response
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size_t extralen;
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// totalbody in response. The length of value is totalbody -
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// extralen - keylen.
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size_t totalbody;
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// Number of bytes left to read variable length field.
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size_t read_left;
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// Parser state; see enum above
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int state;
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// status_code in response
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int status_code;
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// op in response
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int op;
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};
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struct MemcachedSendbuf {
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// Buffer for header + extra + key
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Buffer<512> headbuf;
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// MemcachedRequest associated to this object
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MemcachedRequest *req;
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// Number of bytes left when sending value
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size_t send_value_left;
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// Returns the number of bytes this object transmits.
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size_t left() const { return headbuf.rleft() + send_value_left; }
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};
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constexpr uint8_t MEMCACHED_REQ_MAGIC = 0x80;
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constexpr uint8_t MEMCACHED_RES_MAGIC = 0x81;
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// MemcachedConnection implements part of memcached binary protocol.
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// This is not full brown implementation. Just the part we need is
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// implemented. We only use GET and ADD.
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//
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// https://github.com/memcached/memcached/blob/master/doc/protocol-binary.xml
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// https://code.google.com/p/memcached/wiki/MemcacheBinaryProtocol
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class MemcachedConnection {
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public:
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MemcachedConnection(const Address *addr, struct ev_loop *loop);
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~MemcachedConnection();
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void disconnect();
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int add_request(std::unique_ptr<MemcachedRequest> req);
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int initiate_connection();
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int on_connect();
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int on_write();
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int on_read();
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int send_request();
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void make_request(MemcachedSendbuf *sendbuf, MemcachedRequest *req);
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int parse_packet();
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size_t serialized_size(MemcachedRequest *req);
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void signal_write();
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private:
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Connection conn_;
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std::deque<std::unique_ptr<MemcachedRequest>> recvq_;
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std::deque<std::unique_ptr<MemcachedRequest>> sendq_;
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std::deque<MemcachedSendbuf> sendbufv_;
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MemcachedParseState parse_state_;
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const Address *addr_;
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// Sum of the bytes to be transmitted in sendbufv_.
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size_t sendsum_;
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bool connected_;
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Buffer<8_k> recvbuf_;
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};
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} // namespace shrpx
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#endif // SHRPX_MEMCACHED_CONNECTION_H
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