Module: PgEasyReplicate

Extended by:
Helper
Defined in:
lib/pg_easy_replicate.rb,
lib/pg_easy_replicate/cli.rb,
lib/pg_easy_replicate/group.rb,
lib/pg_easy_replicate/query.rb,
lib/pg_easy_replicate/stats.rb,
lib/pg_easy_replicate/helper.rb,
lib/pg_easy_replicate/version.rb,
lib/pg_easy_replicate/orchestrate.rb

Defined Under Namespace

Modules: Helper Classes: CLI, Error, Group, Orchestrate, Query, Stats

Constant Summary collapse

VERSION = 
"0.1.2"

Class Method Summary collapse

Methods included from Helper

abort_with, connection_info, db_user, internal_schema_name, internal_user_name, logger, publication_name, secondary_source_db_url, source_db_url, subscription_name, target_db_url, test_env?, underscore

Class Method Details

.assert_config ⇒ Object 



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# File 'lib/pg_easy_replicate.rb', line 54

def assert_config
  unless assert_wal_level_logical(config.dig(:source_db))
    abort_with("WAL_LEVEL should be LOGICAL on source DB")
  end

  unless assert_wal_level_logical(config.dig(:target_db))
    abort_with("WAL_LEVEL should be LOGICAL on target DB")
  end

  unless config.dig(:source_db_is_superuser)
    abort_with("User on source database should be a superuser")
  end

  return if config.dig(:target_db_is_superuser)
  abort_with("User on target database should be a superuser")
end

.bootstrap(options) ⇒ Object 



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# File 'lib/pg_easy_replicate.rb', line 71

def bootstrap(options)
  assert_config
  logger.info("Setting up schema")
  setup_schema

  logger.info("Setting up replication user on source database")
  create_user(conn_string: source_db_url, group_name: options[:group_name])

  logger.info("Setting up replication user on target database")
  create_user(conn_string: target_db_url, group_name: options[:group_name])

  logger.info("Setting up groups tables")
  Group.setup
rescue => e
  abort_with("Unable to bootstrap: #{e.message}")
end

.cleanup(options) ⇒ Object 



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# File 'lib/pg_easy_replicate.rb', line 88

def cleanup(options)
  logger.info("Dropping groups table")
  Group.drop

  if options[:everything]
    logger.info("Dropping schema")
    drop_schema
  end

  if options[:everything] || options[:sync]
    Orchestrate.drop_publication(
      group_name: options[:group_name],
      conn_string: source_db_url,
    )

    Orchestrate.drop_subscription(
      group_name: options[:group_name],
      target_conn_string: target_db_url,
    )
  end

  if options[:everything]
    # Drop users at last
    logger.info("Dropping replication user on source database")
    drop_user(conn_string: source_db_url, group_name: options[:group_name])

    logger.info("Dropping replication user on target database")
    drop_user(conn_string: target_db_url, group_name: options[:group_name])
  end
rescue => e
  abort_with("Unable to cleanup: #{e.message}")
end

.config ⇒ Object 



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# File 'lib/pg_easy_replicate.rb', line 25

def config
  abort_with("SOURCE_DB_URL is missing") if source_db_url.nil?
  abort_with("TARGET_DB_URL is missing") if target_db_url.nil?
  @config ||=
    begin
      q =
        "select name, setting from pg_settings where name in  ('max_wal_senders', 'max_worker_processes', 'wal_level',  'max_replication_slots', 'max_logical_replication_workers');"

      {
        source_db_is_superuser: is_super_user?(source_db_url),
        target_db_is_superuser: is_super_user?(target_db_url),
        source_db:
          Query.run(
            query: q,
            connection_url: source_db_url,
            user: db_user(source_db_url),
          ),
        target_db:
          Query.run(
            query: q,
            connection_url: target_db_url,
            user: db_user(target_db_url),
          ),
      }
    rescue => e
      abort_with("Unable to check config: #{e.message}")
    end
end

.drop_schema ⇒ Object 



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# File 'lib/pg_easy_replicate.rb', line 121

def drop_schema
  Query.run(
    query: "DROP SCHEMA IF EXISTS #{internal_schema_name} CASCADE",
    connection_url: source_db_url,
    schema: internal_schema_name,
  )
end

.logger ⇒ Object 



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# File 'lib/pg_easy_replicate.rb', line 144

def logger
  @logger ||=
    begin
      logger = Ougai::Logger.new($stdout)
      logger.level =
        ENV["DEBUG"] ? Ougai::Logger::TRACE : Ougai::Logger::INFO
      logger.with_fields = { version: PgEasyReplicate::VERSION }
      logger
    end
end

.setup_schema ⇒ Object 



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# File 'lib/pg_easy_replicate.rb', line 129

def setup_schema
  sql = <<~SQL
    create schema if not exists #{internal_schema_name};
    grant usage on schema #{internal_schema_name} to #{db_user(source_db_url)};
    grant create on schema #{internal_schema_name} to #{db_user(source_db_url)};
  SQL

  Query.run(
    query: sql,
    connection_url: source_db_url,
    schema: internal_schema_name,
    user: db_user(target_db_url),
  )
end