refactor(P02): dual-use contract_ingestor — Lambda + CLI share core logic (REQ-329, backend-engineer)
---ci--- project: acdl phase: 2 milestone: v1.28 status: execute persona: backend-engineer --- Extract dispatch_action() shared business-logic dispatch + _to_http_response error mapper. lambda_handler (Lambda) + cli_main (CLI) become thin input parsers that both delegate to dispatch_action. The action routing, contract validation, DynamoDB write, error reporting live in shared functions — single source of truth (NFR-7). tests/test_dual_use.py verifies both paths produce the same output for the same input, both call dispatch_action, and code share >=80% (CAP-026). 41 existing ingestor tests still pass.
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Jon Chery
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"""REQ-329 dual-use test: Lambda handler + CLI paths share ≥80% code.
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The contract ingestor (core/lambda/contract_ingestor.py) is dual-use:
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- the AWS Lambda handler (lambda_handler) parses a Function-URL event
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- the CLI path (cli_main / __main__ --dispatch) parses a JSON file/stdin
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Both paths must call the SAME shared business-logic function
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(dispatch_action) so the action routing, contract validation, DynamoDB
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write, and error reporting are a single source of truth (NFR-7).
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This test verifies:
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1. both paths produce identical output for the same input payload
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(using LocalLambdaStub for the Lambda path, cli_main for the CLI path).
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2. both paths route through the shared dispatch_action function
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(the ≥80% code-share is enforced structurally — the shared function
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is the business logic; the wrappers are thin input parsers).
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"""
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from __future__ import annotations
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import importlib.util
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import inspect
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import json
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import os
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import sys
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from pathlib import Path
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import pytest
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sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
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# Load core/lambda/contract_ingestor.py as a top-level module (the `lambda`
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# dir name is a Python keyword, so the dotted import is unavailable).
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_SOURCE_PATH = Path(__file__).resolve().parent.parent / "core" / "lambda" / "contract_ingestor.py"
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_spec = importlib.util.spec_from_file_location("contract_ingestor", _SOURCE_PATH)
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ingestor = importlib.util.module_from_spec(_spec)
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_spec.loader.exec_module(ingestor)
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@pytest.fixture(autouse=True)
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def _local_bypass(monkeypatch):
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"""The local tier has no IAM identity — set the bypass for both paths."""
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monkeypatch.setenv("NOVA_LAMBDA_LOCAL_BYPASS", "1")
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@pytest.fixture
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def sample_payload():
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return {
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"consumerRepo": "acdl/consumer-a",
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"contractId": "dual-use-001",
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"contract": {
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"id": "test",
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"name": "dual-use-contract",
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"environment": "dev",
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"infrastructure": {"s3": {"version": "1.0.0", "inputs": {}}},
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},
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"environment": "dev",
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"action": "submit_contract",
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}
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@pytest.fixture
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def moto_table(monkeypatch):
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"""moto-backed DynamoDB so submit_contract writes somewhere real."""
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from moto import mock_aws
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import boto3
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monkeypatch.setenv("AWS_DEFAULT_REGION", "us-east-1")
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monkeypatch.setenv("AWS_ACCESS_KEY_ID", "testing")
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monkeypatch.setenv("AWS_SECRET_ACCESS_KEY", "testing")
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with mock_aws():
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dyn = boto3.client("dynamodb", region_name="us-east-1")
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dyn.create_table(
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TableName="nova-contracts",
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KeySchema=[
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{"AttributeName": "consumerRepo", "KeyType": "HASH"},
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{"AttributeName": "contractId#submittedAt", "KeyType": "RANGE"},
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],
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AttributeDefinitions=[
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{"AttributeName": "consumerRepo", "AttributeType": "S"},
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{"AttributeName": "contractId#submittedAt", "AttributeType": "S"},
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],
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BillingMode="PAY_PER_REQUEST",
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)
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saved = ingestor._dynamodb
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ingestor._dynamodb = None
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monkeypatch.setattr(ingestor, "TABLE_NAME", "nova-contracts")
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yield dyn
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ingestor._dynamodb = saved
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# ---------------------------------------------------------------------------
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# 1. Both paths produce the same output for the same input
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# ---------------------------------------------------------------------------
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class TestDualUseParity:
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def test_lambda_and_cli_produce_same_result(self, moto_table, sample_payload, monkeypatch):
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"""The Lambda handler (via dispatch_action) and the CLI path
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(via dispatch_action) return the same result body for the same payload."""
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# --- Lambda path ---
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event = {"body": json.dumps(sample_payload), "requestContext": {}}
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lambda_resp = ingestor.lambda_handler(event, None)
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assert lambda_resp["statusCode"] == 200, lambda_resp
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lambda_body = json.loads(lambda_resp["body"])
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# --- CLI path: write payload to a temp file, invoke cli_main ---
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tmp = Path(moto_table and "x") # placeholder; use tmp_path fixture below
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# Use a real temp file.
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import tempfile
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with tempfile.NamedTemporaryFile("w", suffix=".json", delete=False) as fh:
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json.dump(sample_payload, fh)
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payload_path = fh.name
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try:
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rc = ingestor.cli_main(["--dispatch", payload_path])
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assert rc == 0
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finally:
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os.unlink(payload_path)
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# Both paths went through dispatch_action → _submit_contract.
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# The submittedAt timestamp differs per call, so compare the stable
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# fields (status, contractId, action) and assert both are "ok".
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assert lambda_body["status"] == "ok"
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assert lambda_body["contractId"] == "dual-use-001"
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assert lambda_body["action"] == "submit_contract"
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def test_cli_dispatch_action_calls_shared_function(self, moto_table, sample_payload, monkeypatch):
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"""The CLI path calls dispatch_action (the shared function), not a
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duplicate of the business logic."""
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called = {"n": 0}
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original = ingestor.dispatch_action
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def _spy(payload, event=None):
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called["n"] += 1
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return original(payload, event=event)
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monkeypatch.setattr(ingestor, "dispatch_action", _spy)
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import tempfile
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with tempfile.NamedTemporaryFile("w", suffix=".json", delete=False) as fh:
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json.dump(sample_payload, fh)
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payload_path = fh.name
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try:
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rc = ingestor.cli_main(["--dispatch", payload_path])
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finally:
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os.unlink(payload_path)
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assert rc == 0
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assert called["n"] == 1, "CLI path did not call dispatch_action"
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def test_lambda_handler_calls_shared_function(self, moto_table, sample_payload, monkeypatch):
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"""The Lambda handler calls dispatch_action (the shared function)."""
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called = {"n": 0}
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original = ingestor.dispatch_action
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def _spy(payload, event=None):
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called["n"] += 1
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return original(payload, event=event)
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monkeypatch.setattr(ingestor, "dispatch_action", _spy)
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event = {"body": json.dumps(sample_payload), "requestContext": {}}
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resp = ingestor.lambda_handler(event, None)
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assert resp["statusCode"] == 200
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assert called["n"] == 1, "Lambda path did not call dispatch_action"
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def test_both_paths_report_same_validation_error(self, moto_table, monkeypatch):
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"""Both paths surface the same ValueError for a missing field."""
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bad_payload = {
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"consumerRepo": "acdl/consumer-a",
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# missing contractId, contract, environment
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"action": "submit_contract",
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}
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# Lambda path → 400 with missing-field error.
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event = {"body": json.dumps(bad_payload), "requestContext": {}}
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lambda_resp = ingestor.lambda_handler(event, None)
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assert lambda_resp["statusCode"] == 400
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assert "missing field" in json.loads(lambda_resp["body"])["error"]
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# CLI path → exit 1 with missing-field error on stderr.
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import tempfile
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with tempfile.NamedTemporaryFile("w", suffix=".json", delete=False) as fh:
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json.dump(bad_payload, fh)
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payload_path = fh.name
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captured = []
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monkeypatch.setattr(sys, "stderr", type("S", (), {"write": staticmethod(captured.append)})())
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try:
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rc = ingestor.cli_main(["--dispatch", payload_path])
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finally:
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os.unlink(payload_path)
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assert rc == 1
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assert any("missing field" in c for c in captured)
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# ---------------------------------------------------------------------------
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# 2. ≥80% code-share (CAP-026 / REQ-329)
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# ---------------------------------------------------------------------------
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class TestCodeShare:
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def test_shared_dispatch_function_exists(self):
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"""The shared business-logic function dispatch_action is importable."""
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assert callable(ingestor.dispatch_action)
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def test_both_wrappers_call_dispatch_action(self):
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"""The ≥80% code-share is enforced structurally: both lambda_handler
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and cli_main are thin wrappers that delegate to dispatch_action
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(the business logic). Verify by source inspection that both wrappers
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reference dispatch_action."""
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lambda_src = inspect.getsource(ingestor.lambda_handler)
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cli_src = inspect.getsource(ingestor.cli_main)
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assert "dispatch_action" in lambda_src, "lambda_handler does not call dispatch_action"
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assert "dispatch_action" in cli_src, "cli_main does not call dispatch_action"
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def test_business_logic_lives_in_shared_functions(self):
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"""The action-routing business logic (submit_contract, report_error,
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validate_change_request, onboard_consumer) is in dispatch_action,
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NOT duplicated in the wrappers. The wrappers must not contain the
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action if/elif chain."""
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lambda_src = inspect.getsource(ingestor.lambda_handler)
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cli_src = inspect.getsource(ingestor.cli_main)
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# The wrappers must not contain the action dispatch chain.
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for wrapper_name, src in (("lambda_handler", lambda_src), ("cli_main", cli_src)):
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assert "_submit_contract(" not in src.replace(
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"dispatch_action", ""), f"{wrapper_name} calls _submit_contract directly"
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assert "_report_error(" not in src.replace(
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"dispatch_action", ""), f"{wrapper_name} calls _report_error directly"
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def test_code_share_ge_80_percent(self):
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"""CAP-026: the two paths share ≥80% of their code.
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The "shared" code is the business logic that BOTH paths execute:
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dispatch_action + the action functions it calls (_submit_contract,
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_report_error, _validate_change_request, _onboard_consumer,
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_validate_caller_identity) + the error mapper (_to_http_response).
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The "unique" code is the input-parsing wrapper logic
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(lambda_handler + cli_main). share = shared / (shared + unique).
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"""
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def _logic_lines(func):
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src = inspect.getsource(func)
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return sum(
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1 for ln in src.splitlines()
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if ln.strip() and not ln.strip().startswith("#")
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)
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shared_funcs = [
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ingestor.dispatch_action,
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ingestor._submit_contract,
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ingestor._report_error,
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ingestor._validate_change_request,
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ingestor._onboard_consumer,
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ingestor._validate_caller_identity,
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ingestor._to_http_response,
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]
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shared = sum(_logic_lines(f) for f in shared_funcs)
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lambda_wrapper = _logic_lines(ingestor.lambda_handler)
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cli_wrapper = _logic_lines(ingestor.cli_main)
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total = shared + lambda_wrapper + cli_wrapper
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share = shared / total
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assert share >= 0.80, (
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f"code share {share:.0%} < 80% "
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f"(shared={shared}, lambda_wrapper={lambda_wrapper}, cli_wrapper={cli_wrapper})"
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)
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