Drizzled Public API Documentation

analysis_table.cc
1 /*
2  * Copyright (C) 2009, Padraig O'Sullivan
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are met:
7  *
8  * * Redistributions of source code must retain the above copyright notice,
9  * this list of conditions and the following disclaimer.
10  * * Redistributions in binary form must reproduce the above copyright notice,
11  * this list of conditions and the following disclaimer in the documentation
12  * and/or other materials provided with the distribution.
13  * * Neither the name of Padraig O'Sullivan nor the names of its contributors
14  * may be used to endorse or promote products derived from this software
15  * without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
21  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27  * THE POSSIBILITY OF SUCH DAMAGE.
28  */
29 
30 #include <config.h>
31 
32 #include "analysis_table.h"
33 #include "sysvar_holder.h"
34 
35 #include <drizzled/error.h>
36 
37 #include <libmemcached/memcached.h>
38 #include <libmemcached/server.h>
39 
40 namespace drizzle_plugin
41 {
42 
43 AnalysisTableTool::AnalysisTableTool() :
44  plugin::TableFunction("DATA_DICTIONARY", "MEMCACHED_ANALYSIS")
45 {
46  add_field("SERVERS_ANALYZED", plugin::TableFunction::NUMBER);
47  add_field("AVERAGE_ITEM_SIZE", plugin::TableFunction::NUMBER);
48  add_field("NODE_WITH_MOST_MEM_CONSUMPTION");
49  add_field("USED_BYTES", plugin::TableFunction::NUMBER);
50  add_field("NODE_WITH_LEAST_FREE_SPACE");
51  add_field("FREE_BYTES", plugin::TableFunction::NUMBER);
52  add_field("NODE_WITH_LONGEST_UPTIME");
53  add_field("LONGEST_UPTIME", plugin::TableFunction::NUMBER);
54  add_field("POOL_WIDE_HIT_RATIO", plugin::TableFunction::NUMBER);
55 }
56 
57 AnalysisTableTool::Generator::Generator(Field **arg) :
58  plugin::TableFunction::Generator(arg)
59 {
60  is_done= false;
61 }
62 
63 bool AnalysisTableTool::Generator::populate()
64 {
65  if (is_done)
66  {
67  return false;
68  }
69  is_done= true;
70 
71  drizzled::sys_var *servers_var= drizzled::find_sys_var("memcached_stats_servers");
72  assert(servers_var != NULL);
73 
74  const string servers_string(static_cast<char *>(servers_var.value_ptr(NULL, 0)));
75 
76  if (servers_string.empty())
77  {
78  my_printf_error(ER_UNKNOWN_ERROR, _("No value in MEMCACHED_STATS_SERVERS variable."), MYF(0));
79  return false;
80  }
81 
82  memcached_return rc;
83  memcached_st *serv= memcached_create(NULL);
84  memcached_server_st *tmp_serv= memcached_servers_parse(servers_string.c_str());
85  memcached_server_push(serv, tmp_serv);
86  memcached_server_list_free(tmp_serv);
87  memcached_stat_st *stats= memcached_stat(serv, NULL, &rc);
88  memcached_server_st *servers= memcached_server_list(serv);
89 
90  uint32_t server_count= memcached_server_count(serv);
91 
92  if (server_count > 1)
93  {
94  memcached_analysis_st *report= memcached_analyze(serv, stats, &rc);
95 
96  push(static_cast<uint64_t>(server_count));
97  push(static_cast<uint64_t>(report->average_item_size));
98  push(memcached_server_name(serv, servers[report->most_consumed_server]));
99  push(report->most_used_bytes);
100  push(memcached_server_name(serv, servers[report->least_free_server]));
101  push(report->least_remaining_bytes);
102  push(memcached_server_name(serv, servers[report->oldest_server]));
103  push(static_cast<uint64_t>(report->longest_uptime));
104  push(static_cast<int64_t>(report->pool_hit_ratio));
105  free(report);
106  }
107 
108  memcached_stat_free(serv, stats);
109  memcached_free(serv);
110 
111  return true;
112 }
113 
114 } /* namespace drizzle_plugin */
sys_var * find_sys_var(const std::string &name)
Definition: sys_var.cc:1411