Module: LogStash::PluginMixins::Jdbc::Jdbc

Includes:
ValueHandler
Included in:
Inputs::Jdbc
Defined in:
lib/logstash/plugin_mixins/jdbc/jdbc.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ValueHandler

#decorate_value, #extract_values_from

Class Method Details

.included(base) ⇒ Object

This method is called when someone includes this module



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# File 'lib/logstash/plugin_mixins/jdbc/jdbc.rb', line 21

def self.included(base)
  # Add these methods to the 'base' given.
  base.extend(self)
  base.setup_jdbc_config
end

Instance Method Details

#close_jdbc_connection ⇒ Object 



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# File 'lib/logstash/plugin_mixins/jdbc/jdbc.rb', line 208

def close_jdbc_connection
  @connection_lock.synchronize do
    # pipeline restarts can also close the jdbc connection, block until the current executing statement is finished to avoid leaking connections
    # connections in use won't really get closed
    @database.disconnect if @database
  end
rescue => e
  @logger.warn("Failed to close connection", :exception => e)
end

#execute_statement(&result_handler) ⇒ Object 



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# File 'lib/logstash/plugin_mixins/jdbc/jdbc.rb', line 219

def execute_statement(&result_handler)
  success = false
  retry_attempts = @statement_retry_attempts

  @connection_lock.synchronize do
    begin
      retry_attempts -= 1
      open_jdbc_connection
      sql_last_value = @use_column_value ? @value_tracker.value : Time.now.utc
      @tracking_column_warning_sent = false
      @statement_handler.perform_query(@database, @value_tracker.value) do |row|
        sql_last_value = get_column_value(row) if @use_column_value
        yield extract_values_from(row)
      end
      success = true
    rescue Sequel::Error, Java::JavaSql::SQLException => e
      details = { exception: e.class, message: e.message }
      details[:cause] = e.cause.inspect if e.cause
      details[:backtrace] = e.backtrace if @logger.debug?
      @logger.warn("Exception when executing JDBC query", details)

      if retry_attempts == 0
        @logger.error("Unable to execute statement. Tried #{@statement_retry_attempts} times.")
      else
        @logger.error("Unable to execute statement. Trying again.")
        sleep(@statement_retry_attempts_wait_time)
        retry
      end
    else
      @value_tracker.set_value(sql_last_value)
    ensure
      close_jdbc_connection
    end
  end

  return success
end

#get_column_value(row) ⇒ Object 



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# File 'lib/logstash/plugin_mixins/jdbc/jdbc.rb', line 258

def get_column_value(row)
  if !row.has_key?(@tracking_column.to_sym)
    if !@tracking_column_warning_sent
      @logger.warn("tracking_column not found in dataset.", :tracking_column => @tracking_column)
      @tracking_column_warning_sent = true
    end
    # If we can't find the tracking column, return the current value in the ivar
    @value_tracker.value
  else
    # Otherwise send the updated tracking column
    row[@tracking_column.to_sym]
  end
end

#prepare_jdbc_connection ⇒ Object 



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# File 'lib/logstash/plugin_mixins/jdbc/jdbc.rb', line 203

def prepare_jdbc_connection
  @connection_lock = Monitor.new # aka ReentrantLock
end

#setup_jdbc_config ⇒ Object 



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# File 'lib/logstash/plugin_mixins/jdbc/jdbc.rb', line 29

def setup_jdbc_config
  # JDBC driver library path to third party driver library. In case of multiple libraries being
  # required you can pass them separated by a comma.
  #
  # If not provided, Plugin will look for the driver class in the Logstash Java classpath.
  config :jdbc_driver_library, :validate => :string

  # JDBC driver class to load, for exmaple, "org.apache.derby.jdbc.ClientDriver"
  # NB per https://github.com/logstash-plugins/logstash-input-jdbc/issues/43 if you are using
  # the Oracle JDBC driver (ojdbc6.jar) the correct `jdbc_driver_class` is `"Java::oracle.jdbc.driver.OracleDriver"`
  config :jdbc_driver_class, :validate => :string, :required => true

  # JDBC connection string
  config :jdbc_connection_string, :validate => :string, :required => true

  # JDBC user
  config :jdbc_user, :validate => :string, :required => true

  # JDBC password
  config :jdbc_password, :validate => :password

  # JDBC password filename
  config :jdbc_password_filepath, :validate => :path

  # JDBC enable paging
  #
  # This will cause a sql statement to be broken up into multiple queries.
  # Each query will use limits and offsets to collectively retrieve the full
  # result-set. The limit size is set with `jdbc_page_size`.
  #
  # Be aware that ordering is not guaranteed between queries.
  config :jdbc_paging_enabled, :validate => :boolean, :default => false

  # Which pagination mode to use, automatic pagination or explicitly defined in the query.
  config :jdbc_paging_mode, :validate => [ "auto", "explicit" ], :default => "auto"

  # JDBC page size
  config :jdbc_page_size, :validate => :number, :default => 100000

  # JDBC fetch size. if not provided, respective driver's default will be used
  config :jdbc_fetch_size, :validate => :number

  # Connection pool configuration.
  # Validate connection before use.
  config :jdbc_validate_connection, :validate => :boolean, :default => false

  # Connection pool configuration.
  # How often to validate a connection (in seconds)
  config :jdbc_validation_timeout, :validate => :number, :default => 3600

  # Connection pool configuration.
  # The amount of seconds to wait to acquire a connection before raising a PoolTimeoutError (default 5)
  config :jdbc_pool_timeout, :validate => :number, :default => 5

  # Timezone conversion.
  # SQL does not allow for timezone data in timestamp fields.  This plugin will automatically
  # convert your SQL timestamp fields to Logstash timestamps, in relative UTC time in ISO8601 format.
  #
  # Using this setting will manually assign a specified timezone offset, instead
  # of using the timezone setting of the local machine.  You must use a canonical
  # timezone, *America/Denver*, for example.
  config :jdbc_default_timezone, :validate => :jdbc_timezone_spec
  extend TimezoneProxy::JDBCTimezoneSpecValidator

  # General/Vendor-specific Sequel configuration options.
  #
  # An example of an optional connection pool configuration
  #    max_connections - The maximum number of connections the connection pool
  #
  # examples of vendor-specific options can be found in this
  # documentation page: https://github.com/jeremyevans/sequel/blob/master/doc/opening_databases.rdoc
  config :sequel_opts, :validate => :hash, :default => {}

  # Log level at which to log SQL queries, the accepted values are the common ones fatal, error, warn,
  # info and debug. The default value is info.
  config :sql_log_level, :validate => [ "fatal", "error", "warn", "info", "debug" ], :default => "info"

  # Maximum number of times to try connecting to database
  config :connection_retry_attempts, :validate => :number, :default => 1
  # Number of seconds to sleep between connection attempts
  config :connection_retry_attempts_wait_time, :validate => :number, :default => 0.5

  # Maximum number of times to try running statement
  config :statement_retry_attempts, :validate => :number, :default => 1
  # Number of seconds to sleep between statement execution
  config :statement_retry_attempts_wait_time, :validate => :number, :default => 0.5

  # give users the ability to force Sequel application side into using local timezone
  config :plugin_timezone, :validate => ["local", "utc"], :default => "utc"
end