resolve.py
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| 1 | """Deterministic routing resolution (§PR.4).""" |
| 2 | |
| 3 | from __future__ import annotations |
| 4 | |
| 5 | from tools.model_routing.types import RouteDecision, RouteEntry, RouteSelector, RoutingPolicy |
| 6 | |
| 7 | |
| 8 | def selector_matches(when: RouteSelector, query: RouteSelector) -> bool: |
| 9 | """Return True when every present ``when`` key equals the query value. |
| 10 | |
| 11 | Omitted ``when`` keys are wildcards. Omitted query keys do not satisfy a |
| 12 | present ``when`` key — the query must explicitly provide each dimension a |
| 13 | rule constrains. |
| 14 | """ |
| 15 | for key in ("position", "phase_tier", "gate"): |
| 16 | when_val = getattr(when, key) |
| 17 | if when_val is None: |
| 18 | continue |
| 19 | query_val = getattr(query, key) |
| 20 | if query_val is None or query_val != when_val: |
| 21 | return False |
| 22 | return True |
| 23 | |
| 24 | |
| 25 | def resolve_route(policy: RoutingPolicy, query: RouteSelector) -> RouteDecision: |
| 26 | """Resolve ``query`` against ``policy`` using first-match-wins + mandatory defaults.""" |
| 27 | for route in policy.routes: |
| 28 | if selector_matches(route.when, query): |
| 29 | return RouteDecision( |
| 30 | route_id=route.id, |
| 31 | model_tier=route.model_tier, |
| 32 | fallback=route.fallback, |
| 33 | ) |
| 34 | return RouteDecision( |
| 35 | route_id="defaults", |
| 36 | model_tier=policy.defaults_model_tier, |
| 37 | fallback=policy.defaults_fallback, |
| 38 | ) |
| 39 | |
| 40 | |
| 41 | def find_matching_route(policy: RoutingPolicy, query: RouteSelector) -> RouteEntry | None: |
| 42 | """Return the first matching route entry, if any.""" |
| 43 | for route in policy.routes: |
| 44 | if selector_matches(route.when, query): |
| 45 | return route |
| 46 | return None |