polylith-migrate-distribute-wiring

Development

[Internal sub-skill of `polylith-migrate-orchestrator`. Do not load directly — load `polylith-migrate-orchestrator` first, which drives all phases.] Distribute app-wiring code from the residual component into the appropriate bases and shared components.

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Source SKILL.md: https://github.com/DavidVujic/python-polylith/blob/HEAD/.agents/skills/polylith/migrate-project/polylith-migrate-distribute-wiring/SKILL.md

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Skill: polylith-migrate-distribute-wiring

Goal

Distribute app-wiring code from the residual component into the appropriate bases and shared components.

Inputs

From migration/<PROJECT>/state.md:

TARGET_TOP_NS
INITIAL_BASE_NAME
Verification commands.
Base names.

From migration/<PROJECT>/manifest.md:

Current module map, including what remains in the residual component.

All inputs from state.md are assumed to satisfy the validation rules in polylith-migrate-discover (### Validation rules). Validate before proceeding.

Steps

1. Read the Residual Component

List every public function remaining in the residual module.
Confirm it contains only app-wiring code.

2. Identify the Split

Trace callers of each function (use grep).
Group callers by base or runner script.
Map each function to its natural base:

Function Pattern	Belongs In	Rationale
`init_consumer`, `close_consumer`	Handler/consumer base	Kafka consumer lifecycle is handler-specific
`init_job`	Jobs base	Job bootstrap is jobs-specific
`init_api` / app factory	API base	HTTP server setup is API-specific

3. Extract Shared Helpers

Identify shared init functions (e.g., init_logging, init_db).
Move shared helpers to a bootstrap component if needed.

4. Move Composite Functions

Move composite functions to their respective bases.
Update runner scripts to import from the base directly.

5. Update Tests

Update integration tests to monkeypatch the correct module.

6. Clean Up

Delete the residual component directory.
Update pyproject.toml to remove the residual brick.

Verify

RUN_TEST_CMD succeeds.
If set, RUN_LINT_CMD and RUN_TYPECHECK_CMD succeed.
Run POLY_CMD_PREFIX check to validate the workspace structure.
Run POLY_CMD_PREFIX sync to synchronize the [tool.polylith.bricks] table with actual imports.

Common failure modes

Symptom	Likely cause	Remediation
Two bases now import the same `init_<x>` function and the residual still exists	Step 6 wasn't reached — the function moved into one base but the residual reference wasn't deleted.	Confirm the residual is gone; if `init_<x>` is genuinely shared by 2+ bases, it belongs in a shared `bootstrap` component (step 3), not in either base.
`mock.patch("<TARGET_TOP_NS>.<INITIAL_BASE_NAME>.init_api")` fails after the move	The test references the old residual path; the function now lives in a base.	Update mock patch strings to the new location, typically `<TARGET_TOP_NS>.<base_name>.<init_func>`.
`poly check` says the residual brick is still declared but its files are gone	`pyproject.toml` `[tool.polylith.bricks]` still lists the deleted brick.	Remove the line from `[tool.polylith.bricks]` and re-run `POLY_CMD_PREFIX sync --quiet`.
Application starts but a runtime feature is missing (e.g., logging, DB)	A shared init helper was moved into one base only. The other base never calls it.	Promote the helper to a shared `bootstrap` component and call it from every base's startup path.
Verification fails and you can't quickly diagnose	Phase commit not yet made.	`git reset --hard HEAD` to roll back to the previous phase's commit and consult the user.

Commit

After verification passes, commit this phase to the migration branch:

git add -A && git commit -m "migrate(<PROJECT>): phase <N> — distribute-wiring"

Substitute <PROJECT>, <N>, and <phase-name> from state.md and the orchestrator's phase table. Do not proceed to the next phase without a clean commit — the per-phase commit is the rollback point for the next phase's failure-mode tables.