1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
2  *
3  *  Libmemcached library
4  *
5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
6  *  All rights reserved.
7  *
8  *  Redistribution and use in source and binary forms, with or without
9  *  modification, are permitted provided that the following conditions are
10  *  met:
11  *
12  *      * Redistributions of source code must retain the above copyright
13  *  notice, this list of conditions and the following disclaimer.
14  *
15  *      * Redistributions in binary form must reproduce the above
16  *  copyright notice, this list of conditions and the following disclaimer
17  *  in the documentation and/or other materials provided with the
18  *  distribution.
19  *
20  *      * The names of its contributors may not be used to endorse or
21  *  promote products derived from this software without specific prior
22  *  written permission.
23  *
24  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
27  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
28  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
30  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31  *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
34  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35  *
36  */
37 
38 
39 #pragma once
40 
41 #ifdef HAVE_NETDB_H
42 # include <netdb.h>
43 #endif
44 
45 #ifdef NI_MAXHOST
46 # define MEMCACHED_NI_MAXHOST NI_MAXHOST
47 #else
48 # define MEMCACHED_NI_MAXHOST 1025
49 #endif
50 
51 #ifdef NI_MAXSERV
52 # define MEMCACHED_NI_MAXSERV NI_MAXSERV
53 #else
54 # define MEMCACHED_NI_MAXSERV 32
55 #endif
56 
57 enum memcached_server_state_t {
58   MEMCACHED_SERVER_STATE_NEW, // fd == -1, no address lookup has been done
59   MEMCACHED_SERVER_STATE_ADDRINFO, // ADDRRESS information has been gathered
60   MEMCACHED_SERVER_STATE_IN_PROGRESS,
61   MEMCACHED_SERVER_STATE_CONNECTED,
62   MEMCACHED_SERVER_STATE_IN_TIMEOUT,
63   MEMCACHED_SERVER_STATE_DISABLED
64 };
65 
66 struct memcached_server_st {
67   struct {
68     bool is_allocated:1;
69     bool is_initialized:1;
70     bool is_shutting_down:1;
71     bool is_dead:1;
72   } options;
73   uint32_t number_of_hosts;
74   uint32_t cursor_active;
75   in_port_t port;
76   uint32_t io_bytes_sent; /* # bytes sent since last read */
77   uint32_t request_id;
78   uint32_t server_failure_counter;
79   uint64_t server_failure_counter_query_id;
80   uint32_t server_timeout_counter;
81   uint64_t server_timeout_counter_query_id;
82   uint32_t weight;
83   uint32_t version;
84   enum memcached_server_state_t state;
85   struct {
86     uint32_t read;
87     uint32_t write;
88     uint32_t timeouts;
89     size_t _bytes_read;
90   } io_wait_count;
91   uint8_t major_version; // Default definition of UINT8_MAX means that it has not been set.
92   uint8_t micro_version; // ditto, and note that this is the third, not second version bit
93   uint8_t minor_version; // ditto
94   memcached_connection_t type;
95   time_t next_retry;
96   struct memcached_st *root;
97   uint64_t limit_maxbytes;
98   struct memcached_error_t *error_messages;
99   char hostname[MEMCACHED_NI_MAXHOST];
100 };
101