Jon Chery
ed36519223
VERIFY: structural — schema-driven outputs + cache; behavioral — 47 tests + CI PASS; quality — mid-milestone checkpoint clean. ---ci--- project: acdl phase: 14 milestone: v1.16 status: complete phase_role: execution requirements: covered: [REQ-178] partial: [] ---/ci---
615 lines
24 KiB
Python
615 lines
24 KiB
Python
"""Nova Contract Resolver — resolve a consumer contract to a Target Stack instance.
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The contract resolver is the bridge between the consumer's declared intent
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(a contract YAML) and the platform's executable representation (a Target
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Stack JSON instance). It:
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1. Loads and validates the contract against schemas/contract.schema.json.
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2. For each module in the contract's `infrastructure` map:
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a. Looks up the module name + version in modules/registry.json
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(version defaults to the latest non-deprecated entry when omitted).
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b. If the module is an L1 primitive: builds a stack fragment from
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the interface.json + module inputs.
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c. If the module is an L2 composition: loads the composition.json,
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expands children to stack resources, resolves wires to ref:
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expressions, and emits the fragment.
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3. Merges all module fragments into a single Target Stack instance:
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- stack.name = contract.id (the short operational acronym)
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- stack.title = contract.name (the full human-readable name)
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- When the contract has one module: resource IDs are unprefixed
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(backward-compatible with existing stack consumers).
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- When the contract has multiple modules: resource IDs are prefixed
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with the module name (e.g. `microservice-vpc`) to avoid collisions,
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and all ref:/parent references are rewritten to match.
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The output is a JSON instance valid against schemas/stack.schema.json,
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ready for the Terraform adapter to compile.
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CLI: contract_resolver.py <contract.yml> <out.json>
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"""
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import json
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import os
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import re
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import sys
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import yaml
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import jsonschema
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# Ensure the repo root (parent of core/) is on sys.path so `from core
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# import env` resolves to THIS package when contract_resolver.py is run
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# as a script (python3 core/contract_resolver.py) — otherwise an
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# editable-installed third-party `core` package can shadow it.
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_REPO_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
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if _REPO_ROOT not in sys.path:
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sys.path.insert(0, _REPO_ROOT)
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from core import env
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def _load_env(env_name, repo_root):
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"""Load the environment onboarding JSON for env_name.
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P7 (REQ-171): delegates to core.environment_check.load() (dedup —
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the two were verbatim duplicates). The environment_check module is
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in the same core/ package, so the import works both as a package
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import and as a script (`python3 core/contract_resolver.py`).
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"""
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from core import environment_check
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return environment_check.load(env_name, root=repo_root)
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def _load_json(path):
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with open(path, "r") as fh:
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return json.load(fh)
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# P14 (REQ-178): cache loaded JSON schemas so resolve() doesn't re-read
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# from disk on every call.
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_SCHEMA_CACHE: dict = {}
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def _load_schema(path):
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"""Load a JSON schema with caching (P14, REQ-178)."""
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cached = _SCHEMA_CACHE.get(path)
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if cached is not None:
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return cached
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schema = _load_json(path)
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_SCHEMA_CACHE[path] = schema
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return schema
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def _load_yaml(path):
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with open(path, "r") as fh:
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return yaml.safe_load(fh)
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_TOKEN_RE = re.compile(r"\$\{([a-zA-Z_][a-zA-Z0-9_.]*)\}")
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def _lookup_dotted(context, dotted):
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"""Look up a dotted path (e.g. 'env.state_backend.bucket') in context.
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context is a dict of top-level namespaces (e.g. {'env': {...}, 'contract': {...}}).
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Returns the value or raises KeyError if any segment is missing.
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"""
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parts = dotted.split(".")
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cur = context
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for part in parts:
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if isinstance(cur, dict) and part in cur:
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cur = cur[part]
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else:
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raise KeyError(dotted)
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return cur
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def _expand_vars(value, context):
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"""Recursively expand ${env.<field>} and ${contract.<field>} tokens in value.
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Walks dicts, lists, and strings. Unknown tokens raise ValueError (fail
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loud, no silent passthrough — D-081). Dotted paths are supported
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(e.g. ${env.state_backend.bucket}). The expansion is recursive per D-087
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so nested map/list values expand too.
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"""
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if isinstance(value, str):
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def _replace(match):
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token = match.group(1)
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try:
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resolved = _lookup_dotted(context, token)
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except KeyError:
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raise ValueError(f"unresolved interpolation token: ${{{token}}}")
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if isinstance(resolved, (dict, list)):
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return json.dumps(resolved)
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return str(resolved)
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return _TOKEN_RE.sub(_replace, value)
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if isinstance(value, dict):
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return {k: _expand_vars(v, context) for k, v in value.items()}
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if isinstance(value, list):
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return [_expand_vars(v, context) for v in value]
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return value
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def _resolve_wire_value(wire, contract_inputs, child_outputs):
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"""Resolve a wire 'from' reference to a concrete value.
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Wire 'from' can be:
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- "contract.inputs.<name>" — a contract input value
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- "<childId>.outputs.<name>" — a reference to another child's output
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Returns either a concrete value (string/number/boolean) or a
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"ref:<resourceId>.<outputName>" string for cross-child references.
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For multi-resource L1s (e.g. vpc which expands to vpc-vpc, vpc-subnet,
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vpc-routetable), the ref must point to the sub-resource that actually
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produces the output, not the child id. The child_outputs table maps
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childId -> {outputName -> resourceId} so the ref uses the correct
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resource id.
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"""
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from_expr = wire["from"]
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to_expr = wire["to"]
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# If the 'from' is a contract input, use the concrete value
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if from_expr.startswith("contract.inputs."):
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input_name = from_expr[len("contract.inputs."):]
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if input_name in contract_inputs:
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return contract_inputs[input_name]
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# Check for default
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default = wire.get("default")
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if default is not None:
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return default
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return None
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# If the 'from' is a child output, emit a ref: expression
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if "." in from_expr:
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parts = from_expr.split(".", 2)
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if len(parts) >= 3 and parts[1] == "outputs":
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child_id = parts[0]
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output_name = parts[2]
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# Look up the sub-resource that produces this output.
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# child_outputs[child_id] is a dict {outputName -> resourceId}.
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# If the child is a single-resource L1, the resourceId == child_id.
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# If multi-resource, the resourceId is the expanded sub-resource id.
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child_out_map = child_outputs.get(child_id, {})
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resource_id = child_out_map.get(output_name, child_id)
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return f"ref:{resource_id}.{output_name}"
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return None
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def _latest_version(registry, module_name):
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"""Return the latest non-deprecated version string for a module.
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Falls back to the highest version even if all are deprecated.
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"""
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versions = registry[module_name]
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non_deprecated = [(v, e) for v, e in versions.items()
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if not e.get("deprecated", False)]
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if not non_deprecated:
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non_deprecated = list(versions.items())
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non_deprecated.sort(key=lambda x: [int(p) for p in x[0].split(".")],
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reverse=True)
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return non_deprecated[0][0]
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def _resolve_l1(module_name, version, inputs, registry, repo_root):
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"""Resolve a single L1 primitive module to a stack-fragment (resources list)."""
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module_ref = f"{module_name}@{version}"
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# Load the interface
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entry = registry[module_name][version]
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iface_path = os.path.join(repo_root, entry["interface"])
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iface = _load_json(iface_path)
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# Build the resource
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resource = {
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"id": iface.get("type", module_name).split(":")[-1].replace("_", "-")
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if ":" in iface.get("type", "") else module_name,
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"type": iface["type"],
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"module": module_ref,
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"inputs": dict(inputs),
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"outputs": {
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out_name: {"type": out_spec.get("type", "string")}
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for out_name, out_spec in iface.get("outputs", {}).items()
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},
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}
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# Add NFRs if present in the interface
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nfrs = iface.get("nfrs", {})
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if nfrs:
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resource["nfrs"] = nfrs
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return {
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"kind": "l1",
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"depth": 1,
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"resources": [resource],
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"features": {},
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"outputs": {},
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}
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def _resolve_l2(module_name, version, inputs, registry, repo_root):
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"""Resolve a single L2 composition module to a stack-fragment.
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Returns a dict with: kind, depth, resources, features, outputs.
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The caller is responsible for merging fragments and setting stack.name/title.
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"""
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# Load the composition
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entry = registry[module_name][version]
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comp_path = os.path.join(repo_root, entry["interface"])
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composition = _load_json(comp_path)
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# Track child outputs for wire resolution
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# child_outputs[childId] = {outputName -> resourceId}
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# For single-resource L1s, resourceId == childId
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# For multi-resource L1s, resourceId is the expanded sub-resource id
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child_outputs = {}
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# child_input_map[childId] = {inputName -> sub_resource_id} for multi-resource L1s
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# so a wire targeting <childId>.inputs.<name> routes to the sub-resource
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# that actually declares that input (P1-1 — desired_count -> aws:ecs:service,
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# family -> aws:ecs:task_definition).
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child_input_map = {}
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# data_source_names: set of child ids that are data sources (not modules)
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# The adapter emits `data` blocks for these instead of `module` blocks.
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data_source_names = set()
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resources = []
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# Expand children to resources
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for child in composition["children"]:
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child_id = child["id"]
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child_module = child["module"]
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child_name = child_module.split("@")[0]
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child_version = child_module.split("@")[1] if "@" in child_module else "1.0.0"
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# Load the child's interface to get type and outputs
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child_entry = registry[child_name][child_version]
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child_iface_path = os.path.join(repo_root, child_entry["interface"])
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child_iface = _load_json(child_iface_path)
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# Build the output->resourceId map for this child
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child_out_map = {}
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child_in_map = {}
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# For multi-resource L1s (like vpc), the first resource type is the
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# primary; the adapter handles expansion. Use the interface's type
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# or the first resource in the interface's resources array.
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if "resources" in child_iface and child_iface["resources"]:
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# Multi-resource L1: create one resource per sub-resource
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for sub_res in child_iface["resources"]:
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res_id = f"{child_id}-{sub_res['type'].split(':')[-1].replace('_', '-')}" if len(child_iface["resources"]) > 1 else child_id
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resource = {
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"id": res_id,
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"type": sub_res["type"],
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"module": child_module,
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"inputs": {},
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"outputs": {
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out: {"type": "string"}
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for out in sub_res.get("outputs", [])
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},
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}
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resources.append(resource)
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# Map each output to this sub-resource's id
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for out_name in sub_res.get("outputs", []):
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child_out_map[out_name] = res_id
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# Map each declared input to this sub-resource's id (P1-1)
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for in_name in sub_res.get("inputs", []):
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child_in_map[in_name] = res_id
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else:
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# Single-resource L1
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resource = {
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"id": child_id,
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"type": child_iface["type"],
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"module": child_module,
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"inputs": {},
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"outputs": {
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out_name: {"type": out_spec.get("type", "string")}
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for out_name, out_spec in child_iface.get("outputs", {}).items()
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},
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}
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resources.append(resource)
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# Map each output to the child id
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for out_name in child_iface.get("outputs", {}):
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child_out_map[out_name] = child_id
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# Also map interface-level outputs (for L1s that declare outputs at the
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# interface level rather than per-resource)
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for out_name in child_iface.get("outputs", {}):
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if out_name not in child_out_map:
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child_out_map[out_name] = child_id
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child_outputs[child_id] = child_out_map
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child_input_map[child_id] = child_in_map
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# P58: Process data_sources — pseudo-children that reference platform
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# infrastructure via terraform_remote_state. They have outputs but no
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# resources (the adapter emits `data` blocks, not `module` blocks).
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for ds in composition.get("data_sources", []):
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ds_name = ds["name"]
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data_source_names.add(ds_name)
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ds_outputs = ds.get("outputs", [])
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child_outputs[ds_name] = {out: ds_name for out in ds_outputs}
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# Resolve wires to populate inputs
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for wire in composition.get("wires", []):
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to_expr = wire["to"]
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# Parse "to": "<childId>.inputs.<inputName>"
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to_parts = to_expr.split(".")
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if len(to_parts) != 3 or to_parts[1] != "inputs":
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continue
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target_child = to_parts[0]
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input_name = to_parts[2]
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value = _resolve_wire_value(wire, inputs, child_outputs)
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if value is not None:
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# Route to the sub-resource that declares this input (P1-1).
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# child_input_map maps <childId> -> {inputName -> sub_resource_id}.
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# If the input is declared on a specific sub-resource, route there;
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# otherwise fall back to the first matching resource (legacy).
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in_map = child_input_map.get(target_child, {})
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target_res_id = in_map.get(input_name)
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if target_res_id is not None:
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for res in resources:
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if res["id"] == target_res_id:
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res["inputs"][input_name] = value
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break
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else:
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for res in resources:
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if res["id"] == target_child or res["id"].startswith(f"{target_child}-"):
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res["inputs"][input_name] = value
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break
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# REQ-87: Propagate deletion_protection feature flag from contract inputs
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# to all children's NFRs. When inputs.deletion_protection is false,
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# all resources get deletion_protection=false (used by decommission).
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features = {}
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deletion_protection_input = inputs.get("deletion_protection", True)
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if deletion_protection_input is not True:
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for res in resources:
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if "nfrs" not in res:
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res["nfrs"] = {}
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res["nfrs"]["deletion_protection"] = deletion_protection_input
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# Also record the feature flag on the stack object for introspection.
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if "deletion_protection" in inputs:
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features["deletion_protection"] = deletion_protection_input
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# P1-7: Process the composition's outputs[] array to build stack.outputs.
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# Each output wire: {"from": "<childId>.outputs.<name>", "to": "stack.outputs.<outName>"}
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# The child_outputs map (childId -> {outputName: resourceId}) resolves
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# the source to a resource id, which the adapter uses to emit
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# `output "<outName>" { value = aws_<type>.<resourceId>.<attr> }`.
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stack_outputs = {}
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for out_wire in composition.get("outputs", []):
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from_expr = out_wire.get("from", "")
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to_expr = out_wire.get("to", "")
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# Parse "to": "stack.outputs.<outName>"
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to_parts = to_expr.split(".")
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if len(to_parts) != 3 or to_parts[1] != "outputs":
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continue
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out_name = to_parts[2]
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# Parse "from": "<childId>.outputs.<name>"
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from_parts = from_expr.split(".")
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if len(from_parts) != 3 or from_parts[1] != "outputs":
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continue
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src_child = from_parts[0]
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src_output = from_parts[2]
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# Resolve the source resource id from child_outputs
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child_out_map = child_outputs.get(src_child, {})
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src_resource_id = child_out_map.get(src_output, src_child)
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stack_outputs[out_name] = {
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"type": "string",
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"from": src_resource_id,
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"output": src_output,
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}
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return {
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"kind": "l2",
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"depth": composition.get("depth", 1),
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"resources": resources,
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"features": features,
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"outputs": stack_outputs,
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"data_sources": list(data_source_names),
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}
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def _namespace_resources(resources, module_name):
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"""Prefix all resource IDs with the module name for multi-module contracts.
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Rewrites resource 'id', 'parent', and ref: expressions in inputs/outputs
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so cross-references stay consistent within the module fragment.
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"""
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prefix = f"{module_name}-"
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# Build the old->new id mapping
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id_map = {res["id"]: f"{prefix}{res['id']}" for res in resources}
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def _rewrite_ref(val):
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"""Recursively rewrite ref:<id>.<out> and parent:<id> strings."""
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if isinstance(val, str):
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if val.startswith("ref:"):
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# ref:<resourceId>.<outputName>
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rest = val[4:]
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if "." in rest:
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rid, outname = rest.split(".", 1)
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if rid in id_map:
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return f"ref:{id_map[rid]}.{outname}"
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return val
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return val
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if isinstance(val, dict):
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return {k: _rewrite_ref(v) for k, v in val.items()}
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if isinstance(val, list):
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return [_rewrite_ref(v) for v in val]
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return val
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for res in resources:
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res["id"] = id_map[res["id"]]
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# Rewrite parent
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if "parent" in res and res["parent"] in id_map:
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res["parent"] = id_map[res["parent"]]
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# Rewrite all ref: expressions in inputs and outputs
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res["inputs"] = _rewrite_ref(res.get("inputs", {}))
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if "outputs" in res:
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res["outputs"] = _rewrite_ref(res["outputs"])
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return resources, id_map
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def decommission_transform(stack_instance):
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"""REQ-92: re-export from core.decommission_transform (P12, REQ-176)."""
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from core.decommission_transform import decommission_transform as _dt
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return _dt(stack_instance)
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def resolve(contract_path, repo_root=None, environment_override=None):
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"""Resolve a consumer contract to a Target Stack instance.
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Args:
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contract_path: Path to the contract YAML file.
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repo_root: Root of the Nova repo (defaults to two levels up from this file).
|
|
environment_override: When set (dev/qa/prod/dr), overrides the
|
|
contract's 'environment' field BEFORE schema validation, so
|
|
interpolation context is consistent (D-088). Used by
|
|
run_platform.sh --environment.
|
|
|
|
Returns:
|
|
A dict representing the Target Stack instance.
|
|
"""
|
|
if repo_root is None:
|
|
repo_root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
|
|
|
|
# Load contract
|
|
contract = _load_yaml(contract_path)
|
|
|
|
# Apply environment override BEFORE schema validation (D-088) so the
|
|
# schema sees the overridden value and interpolation context is consistent.
|
|
if environment_override:
|
|
contract["environment"] = environment_override
|
|
|
|
# Load schemas
|
|
contract_schema = _load_schema(os.path.join(repo_root, "schemas", "contract.schema.json"))
|
|
|
|
# Validate contract against schema
|
|
jsonschema.validate(contract, contract_schema)
|
|
|
|
# Interpolation (D-081): expand ${env.<field>} + ${contract.<field>}
|
|
# tokens AFTER schema validation (the schema sees raw tokens, which are
|
|
# valid strings) and BEFORE IR resolution (the resolver sees concrete
|
|
# values). The env context is the loaded environment onboarding JSON.
|
|
env_name = contract.get("environment", "dev")
|
|
env = _load_env(env_name, repo_root)
|
|
# Expose 'environment' as an alias for the env's 'name' field so
|
|
# ${env.environment} resolves (the env JSON uses 'name', but contracts
|
|
# reference the environment by ${env.environment}).
|
|
env["environment"] = env.get("name", env_name)
|
|
context = {"env": env, "contract": contract}
|
|
|
|
# Expand interpolation tokens in each module's inputs
|
|
infrastructure = contract.get("infrastructure", {})
|
|
for module_name, module_entry in infrastructure.items():
|
|
module_entry["inputs"] = _expand_vars(
|
|
module_entry.get("inputs", {}), context)
|
|
|
|
# Load registry
|
|
registry = _load_json(os.path.join(repo_root, "modules", "registry.json"))
|
|
|
|
# Validate every module exists in the registry, then resolve each
|
|
module_names = list(infrastructure.keys())
|
|
fragments = []
|
|
for module_name in module_names:
|
|
if module_name not in registry:
|
|
raise ValueError(f"module '{module_name}' not found in registry")
|
|
module_entry = infrastructure[module_name]
|
|
# Default version to latest non-deprecated
|
|
version = module_entry.get("version")
|
|
if version is None:
|
|
version = _latest_version(registry, module_name)
|
|
elif version not in registry[module_name]:
|
|
raise ValueError(
|
|
f"module '{module_name}' version '{version}' not found in registry")
|
|
module_inputs = module_entry.get("inputs", {})
|
|
|
|
# Determine if L1 or L2 — prefer the registry `kind` field (P7,
|
|
# REQ-171); fall back to the path heuristic for entries that
|
|
# predate the kind field.
|
|
entry = registry[module_name][version]
|
|
interface_path = entry["interface"]
|
|
is_l2 = entry.get("kind") == "l2" or (
|
|
"kind" not in entry and ("l2" in interface_path or "composition" in interface_path)
|
|
)
|
|
|
|
if is_l2:
|
|
fragment = _resolve_l2(module_name, version, module_inputs,
|
|
registry, repo_root)
|
|
else:
|
|
fragment = _resolve_l1(module_name, version, module_inputs,
|
|
registry, repo_root)
|
|
fragments.append((module_name, fragment))
|
|
|
|
# Merge fragments into a single stack instance
|
|
all_resources = []
|
|
all_data_sources = []
|
|
max_depth = 1
|
|
any_l2 = False
|
|
merged_features = {}
|
|
merged_outputs = {}
|
|
|
|
multi_module = len(fragments) > 1
|
|
|
|
for module_name, fragment in fragments:
|
|
if fragment["kind"] == "l2":
|
|
any_l2 = True
|
|
max_depth = max(max_depth, fragment["depth"])
|
|
merged_features.update(fragment.get("features", {}))
|
|
all_data_sources.extend(fragment.get("data_sources", []))
|
|
|
|
if multi_module:
|
|
# Namespace resource IDs to avoid cross-module collisions
|
|
namespaced, id_map = _namespace_resources(
|
|
fragment["resources"], module_name)
|
|
# Namespace the fragment's stack outputs (from refs)
|
|
for out_name, out_spec in fragment.get("outputs", {}).items():
|
|
src_id = out_spec.get("from", "")
|
|
if src_id in id_map:
|
|
out_spec["from"] = id_map[src_id]
|
|
merged_outputs[f"{module_name}-{out_name}"] = out_spec
|
|
all_resources.extend(namespaced)
|
|
else:
|
|
# Single module: keep IDs as-is (backward compatible)
|
|
merged_outputs.update(fragment.get("outputs", {}))
|
|
all_resources.extend(fragment["resources"])
|
|
|
|
# Determine stack kind: L2 if any module is L2 or if multi-module (P7)
|
|
kind = "l2" if (multi_module or any_l2) else "l1"
|
|
|
|
stack_instance = {
|
|
"version": "1.0.0",
|
|
"stack": {
|
|
"name": contract["id"],
|
|
"kind": kind,
|
|
"depth": max_depth,
|
|
"environment": contract.get("environment", "dev"),
|
|
},
|
|
"resources": all_resources,
|
|
"data_sources": all_data_sources,
|
|
}
|
|
|
|
# Add the human-readable title
|
|
if contract.get("name"):
|
|
stack_instance["stack"]["title"] = contract["name"]
|
|
|
|
# Add features if any were set
|
|
if merged_features:
|
|
stack_instance["stack"]["features"] = merged_features
|
|
|
|
# Add stack-level outputs
|
|
if merged_outputs:
|
|
stack_instance["outputs"] = merged_outputs
|
|
|
|
# Validate against stack schema
|
|
stack_schema = _load_schema(os.path.join(repo_root, "schemas", "stack.schema.json"))
|
|
jsonschema.validate(stack_instance, stack_schema)
|
|
|
|
return stack_instance
|
|
|
|
|
|
if __name__ == "__main__":
|
|
# P12 (REQ-176): CLI extracted to core/contract_resolver_cli.py.
|
|
from core.contract_resolver_cli import main
|
|
sys.exit(main()) |