Class: Fluent::Plugin::MysqlReplicatorInput

Inherits:
Input
  • Object
show all
Defined in:
lib/fluent/plugin/in_mysql_replicator.rb

Instance Method Summary collapse

Instance Method Details

#configure(conf) ⇒ Object 



24
25
26
27
28
29
30
31
32
33
 
# File 'lib/fluent/plugin/in_mysql_replicator.rb', line 24

def configure(conf)
  super
  @interval = Fluent::Config.time_value(@interval)

  if @tag.nil?
    raise Fluent::ConfigError, "mysql_replicator: missing 'tag' parameter. Please add following line into config like 'tag replicator.mydatabase.mytable.${event}.${primary_key}'"
  end

  log.info "adding mysql_replicator worker. :tag=>#{tag} :query=>#{@query} :prepared_query=>#{@prepared_query} :interval=>#{@interval}sec :enable_delete=>#{enable_delete}"
end

#emit_record(tag, record) ⇒ Object 



133
134
135
 
# File 'lib/fluent/plugin/in_mysql_replicator.rb', line 133

def emit_record(tag, record)
  router.emit(tag, Fluent::Engine.now, record)
end

#format_tag(tag, param) ⇒ Object 



125
126
127
128
129
130
131
 
# File 'lib/fluent/plugin/in_mysql_replicator.rb', line 125

def format_tag(tag, param)
  pattern = {'${event}' => param[:event].to_s, '${primary_key}' => @primary_key}
  tag.gsub(/(\${[a-z_]+})/) do
    log.warn "mysql_replicator: missing placeholder. :tag=>#{tag} :placeholder=>#{$1}" unless pattern.include?($1)
    pattern[$1]
  end
end

#get_connection ⇒ Object 



149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
 
# File 'lib/fluent/plugin/in_mysql_replicator.rb', line 149

def get_connection
  begin
    return Mysql2::Client.new({
      :host => @host,
      :port => @port,
      :username => @username,
      :password => @password,
      :database => @database,
      :encoding => @encoding,
      :reconnect => true,
      :stream => true,
      :cache_rows => false
    })
  rescue Exception => e
    log.warn "mysql_replicator: #{e}"
    sleep @interval
    retry
  end
end

#hash_delete_by_list(hash, deleted_keys) ⇒ Object 



121
122
123
 
# File 'lib/fluent/plugin/in_mysql_replicator.rb', line 121

def hash_delete_by_list (hash, deleted_keys)
  deleted_keys.each{|k| hash.delete(k)}
end

#poll ⇒ Object 



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
 
# File 'lib/fluent/plugin/in_mysql_replicator.rb', line 54

def poll
  table_hash = Hash.new
  ids = Array.new
  con = get_connection()
  prepared_con = get_connection()
  loop do
    rows_count = 0
    start_time = Time.now
    previous_ids = ids
    current_ids = Array.new
    if !@prepared_query.nil?
      @prepared_query.split(/;/).each do |query|
        prepared_con.query(query)
      end
    end
    rows, con = query(@query, con)
    rows.each do |row|
      current_ids << row[@primary_key]
      current_hash = Digest::SHA1.hexdigest(row.flatten.join)
      row.each {|k, v| row[k] = v.to_s if v.is_a?(Time) || v.is_a?(Date) || v.is_a?(BigDecimal)}
      row.select {|k, v| v.to_s.strip.match(/^SELECT(\s+)/i) }.each do |k, v|
        row[k] = [] unless row[k].is_a?(Array)
        nest_rows, prepared_con = query(v.gsub(/\$\{([^\}]+)\}/, row[$1].to_s), prepared_con)
        nest_rows.each do |nest_row|
          nest_row.each {|k, v| nest_row[k] = v.to_s if v.is_a?(Time) || v.is_a?(Date) || v.is_a?(BigDecimal)}
          row[k] << nest_row
        end
        prepared_con.close
      end
      if row[@primary_key].nil?
        log.error "mysql_replicator: missing primary_key. :tag=>#{tag} :primary_key=>#{primary_key}"
        break
      end
      if !table_hash.include?(row[@primary_key])
        tag = format_tag(@tag, {:event => :insert})
        emit_record(tag, row)
      elsif table_hash[row[@primary_key]] != current_hash
        tag = format_tag(@tag, {:event => :update})
        emit_record(tag, row)
      end
      table_hash[row[@primary_key]] = current_hash
      rows_count += 1
    end
    con.close
    ids = current_ids
    if @enable_delete
      if current_ids.empty?
        deleted_ids = Array.new
      elsif previous_ids.empty?
        deleted_ids = [*1...current_ids.max] - current_ids
      else
        deleted_ids = previous_ids - current_ids
      end
      if deleted_ids.count > 0
        hash_delete_by_list(table_hash, deleted_ids)
        deleted_ids.each do |id|
          tag = format_tag(@tag, {:event => :delete})
          emit_record(tag, {@primary_key => id})
        end
      end
    end
    elapsed_time = sprintf("%0.02f", Time.now - start_time)
    log.info "mysql_replicator: finished execution :tag=>#{tag} :rows_count=>#{rows_count} :elapsed_time=>#{elapsed_time} sec"
    sleep @interval
  end
end

#query(query, con = nil) ⇒ Object 



137
138
139
140
141
142
143
144
145
146
147
 
# File 'lib/fluent/plugin/in_mysql_replicator.rb', line 137

def query(query, con = nil)
  begin
    con = con.nil? ? get_connection : con
    con = con.ping ? con : get_connection
    return con.query(query), con
  rescue Exception => e
    log.warn "mysql_replicator: #{e}"
    sleep @interval
    retry
  end
end

#run ⇒ Object 



44
45
46
47
48
49
50
51
52
 
# File 'lib/fluent/plugin/in_mysql_replicator.rb', line 44

def run
  begin
    poll
  rescue StandardError => e
    log.error "mysql_replicator: failed to execute query."
    log.error "error: #{e.message}"
    log.error e.backtrace.join("\n")
  end
end

#shutdown ⇒ Object 



40
41
42
 
# File 'lib/fluent/plugin/in_mysql_replicator.rb', line 40

def shutdown
 super
end

#start ⇒ Object 



35
36
37
38
 
# File 'lib/fluent/plugin/in_mysql_replicator.rb', line 35

def start
  super
  thread_create(:in_mysql_replicator_runner, &method(:run))
end