Class: Fluent::MysqlReplicatorMultiInput

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ MysqlReplicatorMultiInput

Returns a new instance of MysqlReplicatorMultiInput.



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 5

def initialize
  require 'mysql2'
  require 'digest/sha1'
  super
end

Instance Method Details

#collect_gap_ids(setting_name, current_id, previous_id) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 137

def collect_gap_ids(setting_name, current_id, previous_id)
  if (current_id - previous_id) > 1
    query = "SELECT setting_query_pk FROM hash_tables
      WHERE setting_name = '#{setting_name}' 
      AND setting_query_pk > #{previous_id.to_i} AND setting_query_pk < #{current_id.to_i}"
  elsif previous_id > current_id
    query = "SELECT setting_query_pk FROM hash_tables
      WHERE setting_name = '#{setting_name}' 
      AND setting_query_pk > #{previous_id.to_i}"
  elsif previous_id == current_id
    query = "SELECT setting_query_pk FROM hash_tables
      WHERE setting_name = '#{setting_name}' 
      AND (setting_query_pk > #{current_id.to_i} OR setting_query_pk < #{current_id.to_i})"
  end
  ids = Array.new
  unless query.nil?
    @manager_db.query(query).each do |row|
      ids << row['setting_query_pk']
    end
  end
  return ids
end

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 18

def configure(conf)
  super
  @reconnect_interval = Config.time_value('10sec')
  if @tag.nil?
    raise Fluent::ConfigError, "mysql_replicator_multi: missing 'tag' parameter. Please add following line into config like 'tag replicator.${name}.${event}.${primary_key}'"
  end
end

#detect_delete(config, current_id, previous_id) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 124

def detect_delete(config, current_id, previous_id)
  return unless config['enable_delete'] == 1
  deleted_ids = collect_gap_ids(config['name'], current_id, previous_id)
  unless deleted_ids.empty?
    event = :delete
    deleted_ids.each do |id|
      tag = format_tag(@tag, {:name => config['name'], :event => event, :primary_key => config['primary_key']})
      emit_record(tag, {config['primary_key'] => id})
    end
    update_hashtable({:event =>  event, :ids => deleted_ids, :setting_name => config['name']})
  end
end

#detect_insert_update(config, row) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 98

def detect_insert_update(config, row)
  primary_key = config['primary_key']
  current_id = row[primary_key]
  stored_hash = get_stored_hash(config['name'], current_id)
  current_hash = Digest::SHA1.hexdigest(row.flatten.join)

  event = nil
  if stored_hash.empty?
    event = :insert
  elsif stored_hash != current_hash
    event = :update
  end
  unless event.nil?
    tag = format_tag(@tag, {:name => config['name'], :event => event, :primary_key => config['primary_key']})
    emit_record(tag, row)
    update_hashtable({:event => event, :ids => current_id, :setting_name => config['name'], :hash => current_hash})
  end
end

#emit_record(tag, record) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 183

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

#format_tag(tag, param) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 175

def format_tag(tag, param)
  pattern = {'${name}' => param[:name], '${event}' => param[:event].to_s, '${primary_key}' => param[:primary_key]}
  tag.gsub(/\${[a-z_]+(\[[0-9]+\])?}/, pattern) do
    $log.warn "mysql_replicator_multi: missing placeholder. :tag=>#{tag} :placeholder=>#{$1}" unless pattern.include?($1)
    pattern[$1]
  end
end

#get_manager_connection ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 187

def get_manager_connection
  begin
    return Mysql2::Client.new(
      :host => @manager_host,
      :port => @manager_port,
      :username => @manager_username,
      :password => @manager_password,
      :database => @manager_database,
      :encoding => 'utf8',
      :reconnect => true,
      :stream => false,
      :cache_rows => false
    )
  rescue Exception => e
    $log.warn "mysql_replicator_multi: #{e}"
    sleep @reconnect_interval
    retry
  end
end

#get_origin_connection(config) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 207

def get_origin_connection(config)
  begin
    return Mysql2::Client.new(
      :host => config['host'],
      :port => config['manager_port'],
      :username => config['username'],
      :password => config['password'],
      :database => config['database'],
      :encoding => 'utf8',
      :reconnect => true,
      :stream => true,
      :cache_rows => false
    )
  rescue Exception => e
    $log.warn "mysql_replicator_multi: #{e}"
    sleep @reconnect_interval
    retry
  end
end

#get_settings ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 48

def get_settings
  manager_db = get_manager_connection
  settings = []
  query = "SELECT * FROM settings WHERE is_active = 1;"
  manager_db.query(query).each do |row|
    settings << row
  end
  return settings
end

#get_stored_hash(setting_name, id) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 117

def get_stored_hash(setting_name, id)
  query = "SELECT setting_query_hash FROM hash_tables WHERE setting_query_pk = #{id.to_i} AND setting_name = '#{setting_name}'"
  @manager_db.query(query).each do |row|
    return row['setting_query_hash']
  end
end

#poll(config) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 58

def poll(config)
  begin
    @manager_db = get_manager_connection
    masked_config = Hash[config.map {|k,v| (k == 'password') ? [k, v.to_s.gsub(/./, '*')] : [k,v]}]
    @mutex.synchronize {
      $log.info "mysql_replicator_multi: polling start. :config=>#{masked_config}"
    }
    primary_key = config['primary_key']
    previous_id = current_id = 0
    loop do
      start_time = Time.now
      db = get_origin_connection(config)
      db.query(config['query']).each do |row|
        @mutex.lock
        row.each {|k, v| row[k] = v.to_s if v.is_a?(Time) || v.is_a?(Date)}
        current_id = row[primary_key]
        if row[primary_key].nil?
          $log.error "mysql_replicator_multi: missing primary_key. :setting_name=>#{config['name']} :primary_key=>#{primary_key}"
          @mutex.unlock
          break
        end
        detect_insert_update(config, row)
        detect_delete(config, current_id, previous_id)
        previous_id = current_id
        @mutex.unlock
      end
      db.close
      elapsed_time = sprintf("%0.02f", Time.now - start_time)
      $log.info "mysql_replicator_multi: finished execution :setting_name=>#{config['name']} :elapsed_time=>#{elapsed_time} sec"
      sleep config['interval']
    end
  rescue StandardError => e
    @mutex.synchronize {
      $log.error "mysql_replicator_multi: failed to execute query. :config=>#{masked_config}"
      $log.error "error: #{e.message}"
      $log.error e.backtrace.join("\n")
    }
  end
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 42

def shutdown
  @threads.each do |thread|
    Thread.kill(thread)
  end
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 26

def start
  begin
    @threads = []
    @mutex = Mutex.new
    get_settings.each do |config|
      @threads << Thread.new {
        poll(config)
      }
    end
    $log.error "mysql_replicator_multi: stop working due to empty configuration" if @threads.empty?
  rescue StandardError => e
    $log.error "error: #{e.message}"
    $log.error e.backtrace.join("\n")
  end
end

#update_hashtable(opts) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 160

def update_hashtable(opts)
  ids = opts[:ids].is_a?(Integer) ? [opts[:ids]] : opts[:ids]
  ids.each do |id|
    case opts[:event]
    when :insert
      query = "insert into hash_tables (setting_name,setting_query_pk,setting_query_hash) values('#{opts[:setting_name]}','#{id}','#{opts[:hash]}')"
    when :update
      query = "update hash_tables set setting_query_hash = '#{opts[:hash]}' WHERE setting_name = '#{opts[:setting_name]}' AND setting_query_pk = '#{id}'"
    when :delete
      query = "delete from hash_tables WHERE setting_name = '#{opts[:setting_name]}' AND setting_query_pk = '#{id}'"
    end
    @manager_db.query(query) unless query.nil?
  end
end