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.
This commit is contained in:
Jon Chery
@@ -457,29 +457,37 @@ def _onboard_consumer(payload):
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}
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def lambda_handler(event, context):
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"""AWS Lambda handler entry point.
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def dispatch_action(payload, event=None):
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"""Shared business-logic dispatch for the contract ingestor (REQ-329).
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Accepts a Function-URL-style event whose ``body`` is a JSON string
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containing ``{ consumerRepo, contractId, contract, environment, action }``.
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Both the AWS Lambda handler (``lambda_handler``) and the CLI path
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(``cli_main`` / ``__main__``) call this function so the two paths share
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a single source of truth for action routing, contract validation, the
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DynamoDB write, and error reporting (NFR-7 — dual-use, single source).
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Args:
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payload: the decoded action envelope dict
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``{ consumerRepo, contractId, contract, environment, action }``.
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event: the raw Lambda Function-URL event (used for IAM caller
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identity validation). When ``None`` (the CLI path), the identity
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check uses the ``NOVA_LAMBDA_LOCAL_BYPASS`` env var — CLI invocations
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are local-only and do not carry an IAM principal.
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Returns:
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The action result dict (e.g. ``{status, contractId, action, ...}``)
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on success. Raises ``ValueError`` for validation failures and other
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exceptions for downstream errors — the caller is responsible for
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mapping these to the appropriate status code / exit code.
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"""
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try:
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body = event.get("body", "{}")
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if isinstance(body, str):
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payload = json.loads(body)
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else:
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payload = body
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action = payload.get("action", "submit_contract")
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# Validate caller identity against the payload (P1-2).
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_validate_caller_identity(event, payload)
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# Validate caller identity against the payload (P1-2). The CLI path
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# passes event=None; the fail-closed check honours the local bypass.
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_validate_caller_identity(event or {}, payload)
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if action == "submit_contract":
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# Validate required fields up front for a clean 400.
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for field in ("consumerRepo", "contractId", "contract", "environment"):
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if field not in payload:
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return {
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"statusCode": 400,
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"body": json.dumps({"error": f"missing field: {field}"}),
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}
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raise ValueError(f"missing field: {field}")
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result = _submit_contract(payload)
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elif action == "report_error":
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result = _report_error(payload)
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@@ -488,34 +496,110 @@ def lambda_handler(event, context):
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elif action == "onboard_consumer":
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result = _onboard_consumer(payload)
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else:
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return {
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"statusCode": 400,
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"body": json.dumps({"error": f"unknown action: {action}"}),
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}
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return {"statusCode": 200, "body": json.dumps(result)}
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except ValueError as e:
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# P10 (REQ-174): identity failures are 401, field validation is 400.
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if "missing IAM caller identity" in str(e):
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return {"statusCode": 401, "body": json.dumps({"error": str(e)})}
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return {"statusCode": 400, "body": json.dumps({"error": str(e)})}
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raise ValueError(f"unknown action: {action}")
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return result
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def _to_http_response(result_or_error):
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"""Map a dispatch_action result / exception to a Lambda HTTP response.
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Shared error→status mapping so both Lambda + CLI paths interpret errors
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identically (REQ-329 dual-use).
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"""
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if isinstance(result_or_error, Exception):
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msg = str(result_or_error)
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if isinstance(result_or_error, ValueError):
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if "missing IAM caller identity" in msg:
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return {"statusCode": 401, "body": json.dumps({"error": msg})}
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return {"statusCode": 400, "body": json.dumps({"error": msg})}
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return {"statusCode": 500, "body": json.dumps({"error": msg})}
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return {"statusCode": 200, "body": json.dumps(result_or_error)}
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def lambda_handler(event, context):
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"""AWS Lambda handler entry point (thin wrapper, REQ-329 dual-use).
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Accepts a Function-URL-style event whose ``body`` is a JSON string
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containing ``{ consumerRepo, contractId, contract, environment, action }``.
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Parses the Lambda-specific envelope then delegates to the shared
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``dispatch_action`` business logic.
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"""
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try:
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body = event.get("body", "{}")
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payload = json.loads(body) if isinstance(body, str) else body
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result = dispatch_action(payload, event=event)
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return _to_http_response(result)
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except Exception as e: # pragma: no cover - defensive top-level guard
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return {"statusCode": 500, "body": json.dumps({"error": str(e)})}
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return _to_http_response(e)
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# --- CLI: --check-readiness (D-133, REQ-218) ---------------------------
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# Invoked as: python3 -m core.lambda.contract_ingestor --check-readiness <submission.json>
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# Delegates to core.submission_readiness.check_readiness() and prints the
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# structured ReadinessResult. Exits 0 if ready, 1 if not.
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def cli_main(argv=None):
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"""CLI entry point for the contract ingestor (REQ-329 dual-use).
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Usage:
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python3 -m core.lambda.contract_ingestor --dispatch <payload.json>
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python3 -m core.lambda.contract_ingestor --dispatch-stdin < <payload.json>
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Parses the CLI-specific input (a JSON file path or stdin) then delegates
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to the shared ``dispatch_action`` business logic — the same path as the
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Lambda handler. Returns a process exit code (0 success, 1 validation
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error, 2 internal error).
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"""
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import sys
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raw = argv if argv is not None else sys.argv[1:]
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# The --dispatch flag consumes the next positional arg as a payload path;
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# --dispatch-stdin reads the payload from stdin.
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if "--dispatch-stdin" in raw:
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payload = json.loads(sys.stdin.read())
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elif "--dispatch" in raw:
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idx = raw.index("--dispatch")
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path = raw[idx + 1] if idx + 1 < len(raw) else None
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if not path:
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print("Usage: --dispatch <payload.json>", file=sys.stderr)
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return 2
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with open(path) as fh:
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payload = json.loads(fh.read())
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else:
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print(
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"Usage: python3 -m core.lambda.contract_ingestor --dispatch <payload.json>",
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file=sys.stderr,
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)
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return 2
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try:
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result = dispatch_action(payload, event=None)
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sys.stdout.write(json.dumps(result, indent=2) + "\n")
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return 0
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except ValueError as e:
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sys.stderr.write(f"error: {e}\n")
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return 1
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except Exception as e: # pragma: no cover - defensive top-level guard
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sys.stderr.write(f"internal error: {e}\n")
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return 2
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# --- CLI: --check-readiness (D-133, REQ-218) + --dispatch (REQ-329) ----
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# Invoked as:
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# python3 -m core.lambda.contract_ingestor --check-readiness <submission.json>
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# python3 -m core.lambda.contract_ingestor --dispatch <payload.json>
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# The --check-readiness path delegates to core.submission_readiness; the
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# --dispatch path is the dual-use CLI entry (REQ-329) that calls the same
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# dispatch_action() as the Lambda handler.
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if __name__ == "__main__": # pragma: no cover - CLI entry
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import sys
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if "--check-readiness" in sys.argv:
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sys.path.insert(
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0, os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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)
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from core.submission_readiness import cli_main
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from core.submission_readiness import cli_main as _readiness_cli
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# Strip the --check-readiness flag; pass the file path.
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rest = [a for a in sys.argv[1:] if a != "--check-readiness"]
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sys.exit(cli_main(["check-readiness"] + rest))
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sys.exit(_readiness_cli(["check-readiness"] + rest))
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elif "--dispatch" in sys.argv or "--dispatch-stdin" in sys.argv:
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sys.exit(cli_main())
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else:
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print("Usage: python3 -m core.lambda.contract_ingestor --check-readiness <submission.json>")
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print(
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"Usage: python3 -m core.lambda.contract_ingestor "
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"--check-readiness <submission.json> | --dispatch <payload.json>",
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file=sys.stderr,
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)
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@@ -0,0 +1,258 @@
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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:
|
||||
dispatch_action + the action functions it calls (_submit_contract,
|
||||
_report_error, _validate_change_request, _onboard_consumer,
|
||||
_validate_caller_identity) + the error mapper (_to_http_response).
|
||||
The "unique" code is the input-parsing wrapper logic
|
||||
(lambda_handler + cli_main). share = shared / (shared + unique).
|
||||
"""
|
||||
def _logic_lines(func):
|
||||
src = inspect.getsource(func)
|
||||
return sum(
|
||||
1 for ln in src.splitlines()
|
||||
if ln.strip() and not ln.strip().startswith("#")
|
||||
)
|
||||
|
||||
shared_funcs = [
|
||||
ingestor.dispatch_action,
|
||||
ingestor._submit_contract,
|
||||
ingestor._report_error,
|
||||
ingestor._validate_change_request,
|
||||
ingestor._onboard_consumer,
|
||||
ingestor._validate_caller_identity,
|
||||
ingestor._to_http_response,
|
||||
]
|
||||
shared = sum(_logic_lines(f) for f in shared_funcs)
|
||||
lambda_wrapper = _logic_lines(ingestor.lambda_handler)
|
||||
cli_wrapper = _logic_lines(ingestor.cli_main)
|
||||
total = shared + lambda_wrapper + cli_wrapper
|
||||
share = shared / total
|
||||
assert share >= 0.80, (
|
||||
f"code share {share:.0%} < 80% "
|
||||
f"(shared={shared}, lambda_wrapper={lambda_wrapper}, cli_wrapper={cli_wrapper})"
|
||||
)
|
||||
Reference in New Issue
Block a user