summaryrefslogtreecommitdiffstats
path: root/sql/rpl_reporting.h
blob: 8c10f3f04c11e30a7082a6d2ba680bf4bbd3e19b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
/* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1335  USA */

#ifndef RPL_REPORTING_H
#define RPL_REPORTING_H

#include <my_sys.h>                             /* loglevel */

/**
   Maximum size of an error message from a slave thread.
 */
#define MAX_SLAVE_ERRMSG      1024

/**
   Mix-in to handle the message logging and reporting for relay log
   info and master log info structures.

   By inheriting from this class, the class is imbued with
   capabilities to do slave reporting.
 */
class Slave_reporting_capability
{
public:
  /** lock used to synchronize m_last_error on 'SHOW SLAVE STATUS' **/
  mutable mysql_mutex_t err_lock;
  /**
     Constructor.

     @param thread_name Printable name of the slave thread that is reporting.
   */
  Slave_reporting_capability(char const *thread_name);
  mutable my_thread_id err_thread_id;

  /**
     Writes a message and, if it's an error message, to Last_Error
     (which will be displayed by SHOW SLAVE STATUS).

     @param level       The severity level
     @param err_code    The error code
     @param msg         The message (usually related to the error
                        code, but can contain more information), in
                        printf() format.
  */
  void report(loglevel level, int err_code, const char *extra_info,
              const char *msg, ...) const
    ATTRIBUTE_FORMAT(printf, 5, 6);

  /**
     Clear errors. They will not show up under <code>SHOW SLAVE
     STATUS</code>.
   */
  void clear_error() {
    mysql_mutex_lock(&err_lock);
    m_last_error.clear();
    mysql_mutex_unlock(&err_lock);
  }

  /**
     Error information structure.
   */
  class Error {
    friend class Slave_reporting_capability;
  public:
    Error()
    {
      clear();
    }

    void clear()
    {
      number= 0;
      message[0]= '\0';
      timestamp[0]= '\0';
    }
    void update_timestamp()
    {
      struct tm tm_tmp;
      struct tm *start;

      skr= my_time(0);
      localtime_r(&skr, &tm_tmp);
      start=&tm_tmp;

      snprintf(timestamp, sizeof(timestamp), "%02d%02d%02d %02d:%02d:%02d",
               start->tm_year % 100,
               start->tm_mon+1,
               start->tm_mday,
               start->tm_hour,
               start->tm_min,
               start->tm_sec);
      timestamp[15]= '\0';
    }

    /** Error code */
    uint32 number;
    /** Error message */
    char message[MAX_SLAVE_ERRMSG];
    /** Error timestamp as string */
    char timestamp[64];
    /** Error timestamp as time_t variable. Used in performance_schema */
    time_t skr;
  };

  Error const& last_error() const { return m_last_error; }

  virtual ~Slave_reporting_capability()= 0;
private:
  /**
     Last error produced by the I/O or SQL thread respectively.
   */
  mutable Error m_last_error;

  char const *const m_thread_name;

  // not implemented
  Slave_reporting_capability(const Slave_reporting_capability& rhs);
  Slave_reporting_capability& operator=(const Slave_reporting_capability& rhs);
};

#endif // RPL_REPORTING_H