Add laborious

laborious/utils/bundle/steps.py

@@ -0,0 +1,55 @@
+"""The import pipeline's step vocabulary, and the gate-to-step mapping.
+
+`ImportStep` is the join between three things: the machine-readable step written into the import
+record's JSON detail, the key of the error catalog (one code and one sentence per step) and the
+value the frontend switches on. It lives in the bundle package rather than in the activities module
+because the reader raises with it — `laborious/activities/model_import.py` imports it from here so
+there is exactly one definition.
+
+It holds **pipeline** steps only. The two failures that are not steps of the pipeline — failing to
+claim the record and failing to write it — are reported by the failure channel under their own
+markers (`not_claimable`, `status_write`), deliberately outside this enum so the
+catalog-completeness test keeps meaning "every pipeline step has a sentence".
+"""
+
+from __future__ import annotations
+
+from enum import StrEnum
+from typing import Final
+
+
+class ImportStep(StrEnum):
+    """Where an import stopped. Values are what gets written to the record."""
+
+    RECEIVED = 'received'
+    DOWNLOAD = 'download'
+    DECRYPTION = 'decryption'
+    ARCHIVE_INSPECTION = 'archive_inspection'
+    EXTRACTION = 'extraction'
+    STRUCTURE_VALIDATION = 'structure_validation'
+    CONTENT_POLICY = 'content_policy'
+    EXPERIMENT_CREATION = 'experiment_creation'
+    ARTIFACT_UPLOAD = 'artifact_upload'
+    REGISTRATION = 'registration'
+    MODEL_DOCUMENT = 'model_document'
+    CLEANUP = 'cleanup'
+
+
+# The seven gates map onto the first seven steps, with gates 1 and 2 sharing one: both say "these
+# are not the bytes that were sent" — an object over the size ceiling, a key with the wrong shape, a
+# digest that disagrees with what the uploader computed, a wrong magic, an unsupported version, a
+# chunk stream that does not match the header's digest. The catalog's `download` sentence ("The
+# uploaded file could not be read, or it is not the file that was sent. Upload it again.") is true
+# for all of them, and none of them may borrow the `decryption` sentence, which implicates the
+# password.
+GATE_TO_STEP: Final[dict[int, ImportStep]] = {
+    1: ImportStep.DOWNLOAD,
+    2: ImportStep.DOWNLOAD,
+    3: ImportStep.DECRYPTION,
+    4: ImportStep.ARCHIVE_INSPECTION,
+    5: ImportStep.EXTRACTION,
+    6: ImportStep.STRUCTURE_VALIDATION,
+    7: ImportStep.CONTENT_POLICY,
+}
+
+GATE_COUNT: Final[int] = 7