mpt-extension-contrib-phase-step

Shared provisioning-phase gating for SoftwareONE MPT extensions built on the Extension SDK. A step declares the single provisioning phase it runs for; when the order's phase parameter holds a different value the step is skipped and the pipeline records the skip, instead of the step deciding to no-op inside its own body.

It replaces ad-hoc phase checks inside individual extension steps with one reusable gating mechanism shared across pipelines.

See AGENTS.md for the module documentation map.

Install

pip install mpt-extension-contrib-phase-step

Requires the Extension SDK (mpt-extension-sdk >= 6.3, < 7), which is pulled in as a dependency.

Public API

mpt_extension_contrib.phase_step exposes a base step, two functions, and one settings contract:

Design in one line

The SDK already skips a step when its pre() raises SkipStepError (the pipeline logs the skip and continues). This library adds only the missing convention — read the phase parameter, compare, raise — as a function and a thin base step, and keeps phase values and the parameter id out of the library. No decorators or wrappers: gating is expressed by subclassing and, when needed, an explicit await super().pre(context).

Usage

Expose the phase parameter external id in the extension settings:

from dataclasses import dataclass
from typing import Self, override

from mpt_extension_sdk.settings.extension import BaseExtensionSettings

from mpt_extension_contrib.phase_step import PhaseStepSettings


@dataclass(frozen=True)
class ExtensionSettings(BaseExtensionSettings, PhaseStepSettings):
    phase_parameter: str = "phase"

    @override
    @classmethod
    def load(cls) -> Self:
        return cls()

Seed the phase before the first gated step: PhaseGatedStep.pre() runs before process(), so a first step with an unset phase would skip before it could initialize it. Set an initial value via a product default or an ungated initializer step.

Gate a step by subclassing PhaseGatedStep and binding the phase when the pipeline is composed:

from typing import override

from mpt_extension_sdk.pipeline import BasePipeline, BaseStep, OrderContext

from mpt_extension_contrib.phase_step import PhaseGatedStep


class CreateSubscription(PhaseGatedStep):
    @override
    async def process(self, context: OrderContext) -> None:
        # runs only while the phase parameter equals the bound value
        ...


class PurchasePipeline(BasePipeline):
    @property
    def steps(self) -> list[BaseStep]:
        return [
            CreateSubscription("createSubscription"),
            # ... more phase-gated steps ...
        ]

See Usage for a step that adds its own pre() guard and for advancing the phase.

Documentation

• Usage — install, configure, gate steps, advance the phase
• Architecture
• Contributing
• Testing
• Releases