Class: Taps::Push

Inherits:

Operation

• Object
• Operation
• Taps::Push

Defined in:

lib/taps/operation.rb

Instance Attribute Summary

Attributes inherited from Operation

#database_url, #opts, #remote_url, #session_uri

Instance Method Summary

• #fetch_local_tables_info ⇒ Object
• #file_prefix ⇒ Object
• #local_tables_info ⇒ Object
• #push_data ⇒ Object
• #push_data_from_table(stream, progress) ⇒ Object
• #push_indexes ⇒ Object
• #push_partial_data ⇒ Object
• #push_reset_sequences ⇒ Object
• #push_schema ⇒ Object
• #record_count ⇒ Object
• #run ⇒ Object
• #tables ⇒ Object
• #to_hash ⇒ Object

Methods inherited from Operation

#apply_table_filter, #catch_errors, #close_session, #completed_tables, #compression_disabled?, #db, #default_chunksize, #exiting?, factory, #format_number, #http_headers, #indexes_first?, #initialize, #log, #resuming?, #safe_database_url, #safe_remote_url, #safe_url, #server, #session_resource, #set_session, #setup_signal_trap, #store_session, #stream_state, #stream_state=, #table_filter, #verify_server

Constructor Details

This class inherits a constructor from Taps::Operation

Instance Method Details

#fetch_local_tables_info ⇒ Object

# File 'lib/taps/operation.rb', line 547

def fetch_local_tables_info
  tables_with_counts = {}
  db.tables.each do |table|
    tables_with_counts[table] = db[table.to_sym.identifier].count
  end
  apply_table_filter(tables_with_counts)
end

#file_prefix ⇒ Object

# File 'lib/taps/operation.rb', line 387

def file_prefix
  "push"
end

#local_tables_info ⇒ Object

# File 'lib/taps/operation.rb', line 530

def local_tables_info
  opts[:local_tables_info] ||= fetch_local_tables_info
end

#push_data ⇒ Object

# File 'lib/taps/operation.rb', line 457

def push_data
  puts "Sending data"

  puts "#{tables.size} tables, #{format_number(record_count)} records"

  tables.each do |table_name, count|
    stream = Taps::DataStream.factory(db,
      :table_name => table_name,
      :chunksize => default_chunksize)
    progress = ProgressBar.new(table_name.to_s, count)
    push_data_from_table(stream, progress)
  end
end

#push_data_from_table(stream, progress) ⇒ Object

# File 'lib/taps/operation.rb', line 471

def push_data_from_table(stream, progress)
  loop do
    if exiting?
      store_session
      exit 0
    end

    row_size = 0
    chunksize = stream.state[:chunksize]

    begin
      chunksize = Taps::Utils.calculate_chunksize(chunksize) do |c|
        stream.state[:chunksize] = c
        encoded_data, row_size, elapsed_time = stream.fetch
        break if stream.complete?

        data = {
          :state => stream.to_hash,
          :checksum => Taps::Utils.checksum(encoded_data).to_s
        }

        begin
          content, content_type = Taps::Multipart.create do |r|
            r.attach :name => :encoded_data,
              :payload => encoded_data,
              :content_type => 'application/octet-stream'
            r.attach :name => :json,
              :payload => data.to_json,
              :content_type => 'application/json'
          end
          session_resource['push/table'].post(content, http_headers(:content_type => content_type))
          self.stream_state = stream.to_hash
        rescue => e
          Taps::Utils.reraise_server_exception(e)
        end

        elapsed_time
      end
    rescue Taps::CorruptedData => e
      # retry the same data, it got corrupted somehow.
      next
    rescue Taps::DuplicatePrimaryKeyError => e
      # verify the stream and retry it
      stream = stream.verify_remote_stream(session_resource['push/verify_stream'], http_headers)
      next
    end
    stream.state[:chunksize] = chunksize

    progress.inc(row_size)

    stream.increment(row_size)
    break if stream.complete?
  end

  progress.finish
  completed_tables << stream.table_name.to_s
  self.stream_state = {}
end

#push_indexes ⇒ Object

# File 'lib/taps/operation.rb', line 409

def push_indexes
  idxs = JSON.parse(Taps::Utils.schema_bin(:indexes_individual, database_url))

  return unless idxs.size > 0

  puts "Sending indexes"

  apply_table_filter(idxs).each do |table, indexes|
    next unless indexes.size > 0
    progress = ProgressBar.new(table, indexes.size)
    indexes.each do |idx|
      session_resource['push/indexes'].post(idx, http_headers)
      progress.inc(1)
    end
    progress.finish
  end
end

#push_partial_data ⇒ Object

# File 'lib/taps/operation.rb', line 446

def push_partial_data
  return if stream_state == {}

  table_name = stream_state[:table_name]
  record_count = tables[table_name.to_s]
  puts "Resuming #{table_name}, #{format_number(record_count)} records"
  progress = ProgressBar.new(table_name.to_s, record_count)
  stream = Taps::DataStream.factory(db, stream_state)
  push_data_from_table(stream, progress)
end

#push_reset_sequences ⇒ Object

# File 'lib/taps/operation.rb', line 440

def push_reset_sequences
  puts "Resetting sequences"

  session_resource['push/reset_sequences'].post('', http_headers)
end

#push_schema ⇒ Object

# File 'lib/taps/operation.rb', line 427

def push_schema
  puts "Sending schema"

  progress = ProgressBar.new('Schema', tables.size)
  tables.each do |table, count|
    schema_data = Taps::Utils.schema_bin(:dump_table, database_url, table)
    log.debug "Table: #{table}\n#{schema_data}\n"
    session_resource['push/schema'].post(schema_data, http_headers)
    progress.inc(1)
  end
  progress.finish
end

#record_count ⇒ Object

# File 'lib/taps/operation.rb', line 543

def record_count
  @record_count ||= local_tables_info.values.inject(0) { |a,c| a += c }
end

#run ⇒ Object

# File 'lib/taps/operation.rb', line 395

def run
  catch_errors do
    unless resuming?
      push_schema
      push_indexes if indexes_first?
    end
    setup_signal_trap
    push_partial_data if resuming?
    push_data
    push_indexes unless indexes_first?
    push_reset_sequences
  end
end

#tables ⇒ Object

# File 'lib/taps/operation.rb', line 534

def tables
  h = {}
  local_tables_info.each do |table_name, count|
    next if completed_tables.include?(table_name.to_s)
    h[table_name.to_s] = count
  end
  h
end

#to_hash ⇒ Object

# File 'lib/taps/operation.rb', line 391

def to_hash
  super.merge(:local_tables_info => local_tables_info)
end