Class: ActivePostgres::RollbackManager

Inherits:
Object
  • Object
show all
Defined in:
lib/active_postgres/rollback_manager.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config, ssh_executor, logger: nil) ⇒ RollbackManager

Returns a new instance of RollbackManager.



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# File 'lib/active_postgres/rollback_manager.rb', line 5

def initialize(config, ssh_executor, logger: nil)
  @config = config
  @ssh_executor = ssh_executor
  @logger = logger || Logger.new
  @rollback_stack = []
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/active_postgres/rollback_manager.rb', line 3

def config
  @config
end

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/active_postgres/rollback_manager.rb', line 3

def logger
  @logger
end

#rollback_stack ⇒ Object (readonly)

Returns the value of attribute rollback_stack.



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# File 'lib/active_postgres/rollback_manager.rb', line 3

def rollback_stack
  @rollback_stack
end

#ssh_executor ⇒ Object (readonly)

Returns the value of attribute ssh_executor.



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# File 'lib/active_postgres/rollback_manager.rb', line 3

def ssh_executor
  @ssh_executor
end

Instance Method Details

#clear ⇒ Object

Clear all registered rollback actions



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# File 'lib/active_postgres/rollback_manager.rb', line 52

def clear
  rollback_stack.clear
end

#execute ⇒ Object

Execute all registered rollback actions in reverse order



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# File 'lib/active_postgres/rollback_manager.rb', line 25

def execute
  return if rollback_stack.empty?

  logger.warn "Executing rollback (#{rollback_stack.count} actions)..."

  rollback_stack.reverse.each do |rollback|
    logger.info "  Rolling back: #{rollback[:description]}"

    if rollback[:host]
      ssh_executor.execute_on_host(rollback[:host]) do
        instance_eval(&rollback[:action])
      end
    else
      rollback[:action].call
    end

    logger.success '    Completed'
  rescue StandardError => e
    logger.error "    Failed: #{e.message}"
    # Continue with other rollback actions
  end

  clear
  logger.success 'Rollback completed'
end

#register(description, host: nil) { ... } ⇒ Object

Register a rollback action

Parameters:

  • description (String) —

    Description of what will be rolled back

  • host (String) (defaults to: nil) —

    Host to execute rollback on

Yields:

  • Block to execute for rollback



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# File 'lib/active_postgres/rollback_manager.rb', line 16

def register(description, host: nil, &block)
  rollback_stack.push({
                        description: description,
                        host: host,
                        action: block
                      })
end

#register_database_removal(host, database_name) ⇒ Object 



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# File 'lib/active_postgres/rollback_manager.rb', line 114

def register_database_removal(host, database_name)
  postgres_user = config.postgres_user
  executor = ssh_executor
  register("Drop database #{database_name} on #{host}", host: host) do
    sql = "DROP DATABASE IF EXISTS #{database_name};"
    executor.run_sql_on_backend(self, sql, postgres_user: postgres_user, tuples_only: false, capture: false)
  rescue StandardError
    nil
  end
end

#register_directory_removal(host, dir_path) ⇒ Object 



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# File 'lib/active_postgres/rollback_manager.rb', line 98

def register_directory_removal(host, dir_path)
  register("Remove directory #{dir_path} on #{host}", host: host) do
    execute :sudo, 'rm', '-rf', dir_path
  rescue StandardError
    nil
  end
end

#register_file_removal(host, file_path) ⇒ Object 



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# File 'lib/active_postgres/rollback_manager.rb', line 90

def register_file_removal(host, file_path)
  register("Remove file #{file_path} on #{host}", host: host) do
    execute :sudo, 'rm', '-f', file_path
  rescue StandardError
    nil
  end
end

#register_package_removal(host, packages) ⇒ Object 



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# File 'lib/active_postgres/rollback_manager.rb', line 82

def register_package_removal(host, packages)
  register("Remove packages on #{host}: #{packages.join(', ')}", host: host) do
    execute :sudo, 'apt-get', 'remove', '-y', *packages
  rescue StandardError
    nil
  end
end

#register_postgres_cluster_removal(host, version) ⇒ Object

Common rollback actions for PostgreSQL components



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# File 'lib/active_postgres/rollback_manager.rb', line 71

def register_postgres_cluster_removal(host, version)
  register("Remove PostgreSQL cluster on #{host}", host: host) do
    begin
      execute :sudo, 'systemctl', 'stop', 'postgresql'
    rescue StandardError
      nil
    end
    execute :sudo, 'pg_dropcluster', '--stop', version.to_s, 'main', rescue: nil
  end
end

#register_postgres_user_removal(host, username) ⇒ Object 



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# File 'lib/active_postgres/rollback_manager.rb', line 125

def register_postgres_user_removal(host, username)
  postgres_user = config.postgres_user
  executor = ssh_executor
  register("Drop PostgreSQL user #{username} on #{host}", host: host) do
    sql = "DROP USER IF EXISTS #{username};"
    executor.run_sql_on_backend(self, sql, postgres_user: postgres_user, tuples_only: false, capture: false)
  rescue StandardError
    nil
  end
end

#register_user_removal(host, username) ⇒ Object 



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# File 'lib/active_postgres/rollback_manager.rb', line 106

def register_user_removal(host, username)
  register("Remove user #{username} on #{host}", host: host) do
    execute :sudo, 'userdel', username
  rescue StandardError
    nil
  end
end

#with_rollback(description: 'operation') { ... } ⇒ Object

Wrap a block with automatic rollback on failure

Parameters:

  • description (String) (defaults to: 'operation') —

    Description of the operation

Yields:

  • Block to execute



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# File 'lib/active_postgres/rollback_manager.rb', line 59

def with_rollback(description: 'operation')
  result = yield
  clear # Success - clear rollback stack
  result
rescue StandardError => e
  logger.error "#{description} failed: #{e.message}"
  execute if rollback_stack.any?
  raise
end