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/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Libmemcached library
*
* Copyright (C) 2011 Data Differential, http://datadifferential.com/
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* * The names of its contributors may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#pragma once
#include "config.h"
#include <assert.h>
#include <libmemcachedprotocol-0.0/handler.h>
#include <libmemcachedprotocol/cache.h>
#include <libmemcached/byteorder.h>
#include <libmemcached/socket.hpp>
/*
* I don't really need the following two functions as function pointers
* in the instance handle, but I don't want to put them in the global
* namespace for those linking statically (personally I don't like that,
* but some people still do). If it ever shows up as a performance thing
* I'll look into optimizing this ;-)
*/
typedef bool (*drain_func)(memcached_protocol_client_st *client);
typedef protocol_binary_response_status (*spool_func)(memcached_protocol_client_st *client,
const void *data,
size_t length);
/**
* Definition of the per instance structure.
*/
struct memcached_protocol_st {
memcached_binary_protocol_callback_st *callback;
memcached_protocol_recv_func recv;
memcached_protocol_send_func send;
/*
* I really don't need these as funciton pointers, but I don't want
* to clutter the namespace if someone links statically.
*/
drain_func drain;
spool_func spool;
/*
* To avoid keeping a buffer in each client all the time I have a
* bigger buffer in the instance that I read to initially, and then
* I try to parse and execute as much from the buffer. If I wasn't able
* to process all data I'll keep that in a per-connection buffer until
* the next time I can read from the socket.
*/
uint8_t *input_buffer;
size_t input_buffer_size;
bool pedantic;
/* @todo use multiple sized buffers */
cache_t *buffer_cache;
};
struct chunk_st {
/* Pointer to the data */
char *data;
/* The offset to the first byte into the buffer that is used */
size_t offset;
/* The offset into the buffer for the first free byte */
size_t nbytes;
/* The number of bytes in the buffer */
size_t size;
/* Pointer to the next buffer in the chain */
struct chunk_st *next;
};
#define CHUNK_BUFFERSIZE 2048
typedef memcached_protocol_event_t (*process_data)(struct memcached_protocol_client_st *client, ssize_t *length, void **endptr);
enum ascii_cmd {
GET_CMD,
GETS_CMD,
SET_CMD,
ADD_CMD,
REPLACE_CMD,
CAS_CMD,
APPEND_CMD,
PREPEND_CMD,
DELETE_CMD,
INCR_CMD,
DECR_CMD,
STATS_CMD,
FLUSH_ALL_CMD,
VERSION_CMD,
QUIT_CMD,
VERBOSITY_CMD,
UNKNOWN_CMD
};
struct memcached_protocol_client_st {
bool is_verbose;
memcached_protocol_st *root;
memcached_socket_t sock;
int error;
/* Linked list of data to send */
struct chunk_st *output;
struct chunk_st *output_tail;
/*
* While we process input data, this is where we spool incomplete commands
* if we need to receive more data....
* @todo use the buffercace
*/
uint8_t *input_buffer;
size_t input_buffer_size;
size_t input_buffer_offset;
/* The callback to the protocol handler to use (ascii or binary) */
process_data work;
/*
* Should the spool data discard the data to send or not? (aka noreply in
* the ascii protocol..
*/
bool mute;
/* Members used by the binary protocol */
protocol_binary_request_header *current_command;
/* Members used by the ascii protocol */
enum ascii_cmd ascii_command;
};
#include "ascii_handler.h"
#include "binary_handler.h"
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