Module: Fluent::FlydataSync

Included in:
MysqlBinlogFlydataInput
Defined in:
lib/flydata/fluent-plugins/flydata_plugin_ext/flydata_sync.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/flydata/fluent-plugins/flydata_plugin_ext/flydata_sync.rb', line 11

def self.included(base)
  base.class_eval do
    include FlushSupport
    prepend TransactionSupport

    config_param :data_entry_name, :string, default: nil  # data entry name
    config_param :data_entry_type, :string, default: nil  # data entry type
    config_param :tables, :string
    config_param :tables_append_only, :string
    config_param :pk_override, :hash, default: {}
    config_param :table_attributes, :array, default: []
    config_param :tag, :string
    config_param :position_file, :string, default: 'position.binlog.pos'
  end
end

Instance Method Details

#build_data_entry(base_object = {}) ⇒ Object 



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# File 'lib/flydata/fluent-plugins/flydata_plugin_ext/flydata_sync.rb', line 90

def build_data_entry(base_object = {})
  de = base_object || {}
  de['name'] = @data_entry_name
  de['type'] = @data_entry_type
  de.merge!(@data_entry_preferences || {})
  de
end

#configure(conf) ⇒ Object 



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# File 'lib/flydata/fluent-plugins/flydata_plugin_ext/flydata_sync.rb', line 27

def configure(conf)
  super

  @source_position_file = self.class::SOURCE_POSITION_FILE_CLASS.new(@position_file)
  unless @source_position_file.exists?
    raise "No position file(#{@source_position_file.path}). Initial synchronization is required before starting."
  end

  load_custom_conf # preference module needs to be included
  @data_entry = build_data_entry
  @source = Flydata::Source.create(@data_entry)

  @sync_fm = Flydata::SyncFileManager.new(@data_entry, @source)
  sent_position_file_path = @sync_fm.sent_source_pos_path(@position_file)
  @sent_position_file = self.class::SOURCE_POSITION_FILE_CLASS.new(sent_position_file_path)

  # Create positions dir
  positions_path = @sync_fm.table_positions_dir_path
  Dir.mkdir positions_path unless File.exists? positions_path

  @tables = @tables.to_s.split(/(?:\s*,\s*|\s+)/)
  @omit_events = Hash.new
  @tables_append_only = @tables_append_only.to_s.split(/(?:\s*,\s*|\s+)/)
  @tables_append_only.each do |table|
    @tables << table unless @tables.include?(table)
    @omit_events[table] = [:delete, :truncate_table]
  end

  # Remove tables that do not have pos files
  new_tables = @sync_fm.get_new_table_list(@tables, "pos")
  @tables -= new_tables
  $log.info "Not watching these tables: #{new_tables.join(", ")}"

  # Set table revisions
  @table_revs = @tables.inject({}) do |h, table_name|
    h[table_name] = @sync_fm.table_rev(table_name)
    h
  end

  # Re-construct pk_override & table_attributes
  #   @pk_override should include both USER_PK_OVERRIDE and UK_AS_PK_OVERRIDE.
  #   If mismatch happens here, @pk_override value should come from a local conf file.
  #TODO support UK_AS_PK_OVERRIDE for tables existing only in local conf, not registered on the web.

  pk_override_from_table_attrs = Flydata::TableAttribute::generate_pk_override(@table_attributes)

  if @pk_override != pk_override_from_table_attrs
    # @pk_override in a local conf file only includes USER_PK_OVERRIDE. Update table_attributes.
    Flydata::TableAttribute::delete_attribute(@table_attributes, Flydata::TableAttribute::USER_PK_OVERRIDE)
    Flydata::TableAttribute::save_attribute(@table_attributes, @pk_override, Flydata::TableAttribute::USER_PK_OVERRIDE)

    @pk_override = Flydata::TableAttribute::generate_pk_override(@table_attributes)
    $log.info "Update primary key override. Using #{@pk_override}"

    prefs = @data_entry['mysql_data_entry_preference'] || @data_entry['postgresql_data_entry_preference']
    prefs['table_attributes'] = @table_attributes
    prefs['pk_override'] = @pk_override
  end

  $log.info("Source position - resume_pos:'#{@source_position_file.read rescue IOError}' " +
            "sent_pos:'#{@sent_position_file.read rescue nil}'")
end