Class: MysqlManager::Utilities

Inherits:
Object
  • Object
show all
Defined in:
lib/mysql_manager/utilities.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Utilities

Returns a new instance of Utilities.



30
31
32
33
34
35
36
37
38
39
 
# File 'lib/mysql_manager/utilities.rb', line 30

def initialize(options = {})
  options[:dsn] ||= "DBI:Mysql:mysql:localhost"
  options[:username] ||= "root"
  options[:password] ||= ""

  @log = Logger.new(STDERR)

  # connect to the MySQL server
  @dbh = DBI.connect(options[:dsn], options[:username], options[:password])
end

Instance Attribute Details

#dbh ⇒ Object

Returns the value of attribute dbh.



28
29
30
 
# File 'lib/mysql_manager/utilities.rb', line 28

def dbh
  @dbh
end

#dry_run ⇒ Object

Returns the value of attribute dry_run.



28
29
30
 
# File 'lib/mysql_manager/utilities.rb', line 28

def dry_run
  @dry_run
end

#log ⇒ Object

Returns the value of attribute log.



28
29
30
 
# File 'lib/mysql_manager/utilities.rb', line 28

def log
  @log
end

Instance Method Details

#kill_queries(options = {}) ⇒ Object 



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
 
# File 'lib/mysql_manager/utilities.rb', line 41

def kill_queries(options = {})
  options[:max_query_time] ||= -1
  options[:user] ||= []
  options[:host] ||= []
  options[:query] ||= []
  options[:command] ||= []
  options[:state] ||= []
  options[:db] ||= []

  @dbh.execute("SHOW FULL PROCESSLIST") do |sth|
    sth.fetch_hash() do |row| 
      next if row['Command'] == 'Binlog Dump'
      next if row['User'] == 'system user'

      results = []
      options.each_pair do |field,criteria|
        case field
        when :max_query_time
          if criteria >= 0
            if row['Time'].to_i > criteria
              results << true
            else
              results << false
            end
          end
        when :user, :host, :query, :command, :state, :db
          
          col = field == :query ? 'Info' : field.to_s.capitalize

          if criteria.length > 0
            matched = false
            criteria.each do |pattern|
              if pattern.match(row[col])
                matched = true
                break
              end
            end
            #puts "#{row[col]} #{criteria.inspect} == #{matched}"
            results << matched
          end
        end
      end
      # Some conditions need to apply
      #puts results.inspect
      if results.length > 0
        # None of them may be false
        unless results.include?(false)
          begin
            @log.info("Killing id:#{row['Id']} db:#{row['db']} user:#{row['User']} command:#{row['Command']} state:#{row['State']} time:#{row['Time']} host:#{row['Host']} query:#{row['Info']} rows_sent:#{row['Rows_sent']} rows_examined:#{row['Rows_examined']} rows_read:#{row['Rows_read']}")
            @dbh.do("KILL #{row['Id']}") unless @dry_run
          rescue DBI::DatabaseError => e
            @log.warn(e.message)
          end
        end
      end
    end
  end
end

#reload_my_cnf(options = {}) ⇒ Object 



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
134
135
136
137
138
139
140
141
142
 
# File 'lib/mysql_manager/utilities.rb', line 100

def reload_my_cnf(options = {})
  options[:config] ||= '/etc/my.cnf'
  options[:groups] ||= ['mysqld', 'mysqld_safe', 'mysql.server', 'mysql_server', 'server', 'mysql']

  variables = {}
  @dbh.execute("SHOW VARIABLES") do |sth|
    sth.fetch_hash() do |row| 
      variables[row['Variable_name']] = row['Value']
    end
  end
  unless File.exists?(options[:config])
    raise FileNotFoundException.new("Unable to open file #{options[:config]}")
  end
  
  my_cnf = ParseConfig.new(options[:config])
  my_cnf.groups.each do |group|
  if options[:groups].include?(group)
      @log.debug("loading values from [#{group}]")
      my_cnf[group].each_pair do |k,v|
        next if v.nil? || v.empty?
        if variables.has_key?(k)
          begin
            v = v.to_s
            v = v.to_i if v =~ /^(\d+)$/
            v = $1.to_i * (1024) if v =~ /^(\d+)K$/
            v = $1.to_i * (1024*1024) if v =~ /^(\d+)M$/
            v = $1.to_i * (1024*1024*1024) if v =~ /^(\d+)G$/
            if v.instance_of?(Integer) || v.instance_of?(Fixnum)
              sql = "SET GLOBAL #{k} = #{v}"
            else
              sql = "SET GLOBAL #{k} = '#{v}'"
            end
            @dbh.do(sql) unless @dry_run
            @log.info("set #{k}=#{v}")
          rescue DBI::DatabaseError => e
            @log.debug(@dbh.last_statement)
            @log.warn(e.message)
          end
        end
      end
    end 
  end
end

#skip_replication_errors(options = {}) ⇒ Object 



144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
 
# File 'lib/mysql_manager/utilities.rb', line 144

def skip_replication_errors(options = {})
  options[:max_errors] ||= -1
  options[:max_error_duration] ||= -1
  options[:min_healthy_duration] ||= -1
  options[:log_frequency] ||= 10

  begin
    # get server version string and display it
    max_seconds_behind = 0
    t_start = Time.now.to_f
    t_last_error = nil
    t_last_error_elapsed = 0
    t_last_log = 0
    t_elapsed = 0
    t_recovered = 0
    errors = 0
    while (options[:max_errors] < 0 || errors < options[:max_errors]) && (options[:max_error_duration] < 0 || t_last_error_elapsed < options[:max_error_duration])
      @dbh.execute("SHOW SLAVE STATUS") do |sth|
        t_now = Time.now.to_f
  
        sth.fetch_hash() do |row| 
          seconds_behind = row['Seconds_Behind_Master']
          if seconds_behind.nil?
            @log.info("replication broken")
            @log.info("last error: #{row['Last_Error'].gsub(/\r?\n/, '')}")

            @dbh.do("SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1") unless @dry_run
            @dbh.do("START SLAVE")
            errors += 1
            max_seconds_behind = 0
            t_last_error = t_now
          elsif seconds_behind == 0
            t_recovered = t_now if t_recovered == 0
            if t_last_log == 0 || t_now - t_last_log > options[:log_frequency]
              @log.info("fully caught up with master")
              t_last_log = t_now
            end
            if (t_min_healthy_duration >=0) && (t_now - t_recovered > t_min_healthy_duration)
              @log.info("satisfied health duration window")
              break
            end
          else
            seconds_behind = seconds_behind.to_f
            t_recovered = 0
            t_last_error_elapsed = t_last_error.nil? ? 0 : t_now - t_last_error
            t_elapsed = t_now - t_start
            max_seconds_behind = [max_seconds_behind, seconds_behind].max
            t_catchup = max_seconds_behind - seconds_behind
            t_rate = t_elapsed == 0 ? 1 : t_catchup/t_elapsed
            t_left = t_rate > 0 ? seconds_behind/t_rate : 0
            if t_left > 60*60
              t_left_str = sprintf('%.2f hours', t_left/(60*60))
            elsif t_left > 60
              t_left_str = sprintf('%.2f mins', t_left/60)
            else
              t_left_str = sprintf('%.2f secs', t_left)
            end
            if t_last_log == 0 || t_now.to_f - t_last_log.to_f > options[:log_frequency]
              @log.info("#{seconds_behind} seconds behind master; #{t_catchup} seconds caught up; #{sprintf('%.2f', t_rate)} seconds/second; #{t_left_str} left; #{errors} errors; last error #{sprintf('%.2f', t_last_error_elapsed)} seconds ago")
              t_last_log = t_now
            end

            sleep 0.100
          end
        end
      end
    end
  rescue Interrupt
    @log.info("Aborted by user")
  rescue DBI::DatabaseError => e
    @log.error("Error code: #{e.err}: #{e.errstr}")
  end
end