Class: Flydata::SourcePostgresql::GenerateSourceDump

Inherits:
Flydata::Source::GenerateSourceDump show all
Includes:
PostgresqlComponent
Defined in:
lib/flydata/source_postgresql/generate_source_dump.rb

Constant Summary collapse

DUMP_SIZE_QUERY = 
<<EOS
SELECT sum(pg_total_relation_size(c.oid)) AS "total_size"
  FROM pg_class c
  LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
  WHERE nspname = %{schema} AND relname in (%{tables})
EOS

Instance Attribute Summary

Attributes inherited from Flydata::Source::GenerateSourceDump

#dp

Instance Method Summary collapse

Methods included from PostgresqlComponent

#de_prefs

Methods inherited from Flydata::Source::GenerateSourceDump

inherited, #initialize

Methods inherited from Flydata::Source::Component

#initialize

Constructor Details

This class inherits a constructor from Flydata::Source::GenerateSourceDump

Instance Method Details

#confirmation_items ⇒ Object 



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# File 'lib/flydata/source_postgresql/generate_source_dump.rb', line 25

def confirmation_items
  items = {
    "host"     => de_prefs['host'],
    "port"     => de_prefs['port'],
    "username" => de_prefs['username'],
    "database" => de_prefs['database'],
    "schema"   => de_prefs['schema'],
  }

  items
end

#dump(tables, file_path = nil, &src_pos_callback) ⇒ Object 



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# File 'lib/flydata/source_postgresql/generate_source_dump.rb', line 62

def dump(tables, file_path = nil, &src_pos_callback)
  io = nil
  if file_path
    io = File.open(file_path, "w")
  else
    raise "dump via pipe has not been implemented yet"
  end

  table_meta = Flydata::SourcePostgresql::TableMeta.new(de_prefs, tables)
  cli = FlydataCore::Postgresql::PGClient.new(de_prefs)
  table_meta.reload(cli)

  tables_missing_meta = tables.select{|t| tm = table_meta[t]; tm.nil? || tm.empty?}
  unless tables_missing_meta.empty?
    raise "Tables are not available.  Check if the following table(s) exist and are visible: #{tables_missing_meta.join(",")}"
  end

  context = source.sync_generate_table_ddl(dp, nil)
  source_pos = get_source_pos(table_meta.current_snapshot, &src_pos_callback)

  options = de_prefs.merge(table_meta: table_meta)
  missing_tables = context.each_source_tabledef(tables, options) do |tabledef, error|
    dump_table(tabledef, source_pos, io, cli) if tabledef
  end

  nil
ensure
  cli.close if cli
  io.close if io
end

#dump_size(tables) ⇒ Object 



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# File 'lib/flydata/source_postgresql/generate_source_dump.rb', line 44

def dump_size(tables)
  cli = FlydataCore::Postgresql::PGClient.new(de_prefs)

  base_query = DUMP_SIZE_QUERY % {
    schema: FlydataCore::Postgresql::QueryHelper.schema_as_value(de_prefs['schema']),
    tables: '%s'   # Use binding parameters for tables
  }
  query = FlydataCore::Postgresql::PGQuery.new(base_query,
            placeholder_size: tables.size,
            placeholder_start_num: 1)
  res = cli.query(query, tables)

  res.first['total_size'].to_i

ensure
  cli.close if cli
end

#run_compatibility_check(dump_dir, backup_dir) ⇒ Object 



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# File 'lib/flydata/source_postgresql/generate_source_dump.rb', line 16

def run_compatibility_check(dump_dir, backup_dir)
  %w(host username database).each do |k|
    if de_prefs[k].to_s.empty?
      raise "'#{k}' is required. Set the value in the conf file " +
            "-> #{Flydata::Preference::DataEntryPreference.conf_path(de)}"
    end
  end
end