meltano.edk.extension.ExtensionBase

class meltano.edk.extension.ExtensionBase

Basic extension interface that must be implemented by all extensions.

abstract describe() → Describe

Describe method.

This method should describe what commands & capabilities the extension provides.

Returns:

A description of the extension.

Return type:

Description

describe_formatted(output_format: DescribeFormat = DescribeFormat.text) → str

Return a formatted description of the extensions commands and capabilities.

Parameters:

output_format – The output format to use.

Returns:

The formatted description.

Return type:

str

initialize(force: bool = False) → None

Initialize the extension.

This method is called on-demand by the user to initialize the extension. Extensions are not required to implement this method, and may no-op.

Parameters:

force – If True, force initialization.

abstract invoke(command_name: str | None, *command_args: Union[str, bytes]) → None

Invoke method.

This method is called when the extension is invoked.

Parameters:

  • command_name – The name of the command to invoke.

  • *command_args – The arguments to pass to the command.

pass_through_invoker(logger: BoundLogger, *command_args: Union[str, bytes]) → None

Pass-through invoker.

This method is used to invoke the wrapped CLI with arbitrary arguments. Note this method will hard exit the process if an unhandled exception is encountered.

Parameters:

  • logger – The logger to use in the event an exception needs to be logged.

  • *command_args – The arguments to pass to the command.

post_invoke(invoked_name: str | None, *invoked_args: Union[str, bytes]) → None

Called after the extension is invoked.

Parameters:

  • invoked_name – The name of the command that was invoked.

  • *invoked_args – The arguments passed to the command that was invoked.

pre_invoke(invoke_name: str | None, *invoke_args: Union[str, bytes]) → None

Called before the extension is invoked.

Parameters:

  • invoke_name – The name of the command that will be passed to invoke.

  • *invoke_args – The arguments that will be passed to invoke.