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文件: /usr/local/src/libmemcached-1.0.18/libmemcachedprotocol/common.h
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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 "mem_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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