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drift_injector.py — Manages world state mutations for AdaptiveWorld.
DRIFT_CONFIGS holds one entry per scenario, defining:
- initial: DYNAMIC_CONFIG values at episode start
- mutated: DYNAMIC_CONFIG values after drift injection
- drift_type: the category of drift (for belief scoring)
The DriftInjector is instantiated per episode and called by
AdaptiveWorldEnvironment at drift_trigger_step.
"""
from typing import Dict, Any
DRIFT_CONFIGS: Dict[str, Dict] = {
# ── Easy: E1 — Field rename (e-commerce order) ─────────────────────────────
"easy_field_rename": {
"initial": {
"order_field": "qty",
"required_extra": None,
"order_status": "confirmed",
"noisy_errors": False,
},
"mutated": {
"order_field": "quantity",
"required_extra": "customer_id",
"order_status": "confirmed",
"noisy_errors": False,
},
"drift_type": "field_rename",
},
# ── Easy: E2 — Endpoint version (hotel booking) ────────────────────────────
"easy_endpoint_version": {
"initial": {
"rooms_endpoint": "/mock_api/rooms/book",
"max_rooms_per_request": 0,
"bulk_booking_allowed": True,
},
"mutated": {
"rooms_endpoint": "/mock_api/v2/rooms/book",
"max_rooms_per_request": 0,
"bulk_booking_allowed": True,
},
"drift_type": "endpoint_version",
},
# ── Easy: E3 — Auth scheme (flight search) ─────────────────────────────────
"easy_auth_format": {
"initial": {
"auth_scheme": "Bearer",
},
"mutated": {
"auth_scheme": "ApiKey",
},
"drift_type": "policy_change",
},
# ── Medium: M1 — Double drift (insurance claim) ────────────────────────────
"medium_double_drift": {
"initial": {
"claims_endpoint": "/mock_api/claims",
"claims_id_field": "policy_id",
"claims_amount_field": "amount",
"claims_require_date": False,
},
"mutated": {
"claims_endpoint": "/mock_api/claims/v2",
"claims_id_field": "policy_number",
"claims_amount_field": "claim_amount",
"claims_require_date": True,
},
"drift_type": "field_rename",
},
# ── Medium: M2 — Policy flip (e-commerce discount) ─────────────────────────
"medium_policy_flip": {
"initial": {
"discount_requires_membership": False,
},
"mutated": {
"discount_requires_membership": True,
},
"drift_type": "policy_change",
},
# ── Medium: M3 — Rate limit rule change (hotel conference) ─────────────────
"medium_rate_limit": {
"initial": {
"rooms_endpoint": "/mock_api/rooms/book",
"max_rooms_per_request": 0,
"bulk_booking_allowed": True,
},
"mutated": {
"rooms_endpoint": "/mock_api/rooms/book",
"max_rooms_per_request": 1,
"bulk_booking_allowed": False,
},
"drift_type": "policy_change",
},
# ── Hard: H1 — Silent semantic drift (order status) ────────────────────────
"hard_status_meaning": {
"initial": {
"order_field": "qty",
"required_extra": None,
"order_status": "confirmed",
"noisy_errors": False,
},
"mutated": {
"order_field": "qty",
"required_extra": None,
"order_status": "approved", # API returns 200 OK but meaning changed
"noisy_errors": False,
},
"drift_type": "silent_semantic",
},
# ── Hard: H2 — Response structure drift (product search) ───────────────────
"hard_response_structure": {
"initial": {
"product_key": "products",
"product_id_field": "id",
"product_price_field": "price",
},
"mutated": {
"product_key": "items",
"product_id_field": "product_id",
"product_price_field": "cost",
},
"drift_type": "silent_semantic",
},
# ── Hard: H3 — Cascading invalidation (category field) ─────────────────────
"hard_cascading": {
"initial": {
"product_category": "electronics",
"discount_requires_membership": False,
},
"mutated": {
"product_category": "tech", # category change
"discount_requires_membership": True, # coupon eligibility invalidated
},
"drift_type": "silent_semantic",
},
# ── Expert: EX1 — Transient error then real drift ─────────────────────────
# Note: transient 503 is handled via secondary_drift_step logic in environment
"expert_transient_vs_real": {
"initial": {
"order_field": "qty",
"required_extra": None,
"order_status": "confirmed",
"noisy_errors": False,
},
"mutated": {
"order_field": "quantity",
"required_extra": None,
"order_status": "confirmed",
"noisy_errors": False,
},
"drift_type": "field_rename",
"transient_error_step": 2, # step 2 returns 503 (not a real drift)
},
# ── Expert: EX2 — Cross-service drift ─────────────────────────────────────
"expert_cross_service": {
"initial": {
"auth_scheme": "Bearer",
"rooms_endpoint": "/mock_api/rooms/book",
},
"mutated": {
"auth_scheme": "ApiKey", # flight drift at step 3
"rooms_endpoint": "/mock_api/rooms/book",
},
"secondary_mutated": {
"auth_scheme": "ApiKey",
"rooms_endpoint": "/mock_api/v2/rooms/book", # hotel drift at step 6
},
"drift_type": "field_rename",
"secondary_drift_step": 6,
},
# ── Expert: EX3 — Deprecation red herring ─────────────────────────────────
"expert_red_herring": {
"initial": {
"claims_endpoint": "/mock_api/claims",
"claims_id_field": "policy_id",
"claims_amount_field": "amount",
"claims_require_date": False,
},
"mutated": {
"claims_endpoint": "/mock_api/claims", # warning added but still same endpoint
"claims_id_field": "policy_id",
"claims_amount_field": "amount",
"claims_require_date": False,
"_deprecated_notice": "field X will be removed in v3", # red herring
},
"final_mutated": {
"claims_endpoint": "/mock_api/claims/v2", # real drift happens at step 6
"claims_id_field": "policy_number",
"claims_amount_field": "amount",
"claims_require_date": False,
},
"drift_type": "endpoint_version",
"secondary_drift_step": 6,
},
}
class DriftInjector:
"""
Manages world state for a single episode.
Instantiated per episode by AdaptiveWorldEnvironment.
"""
def __init__(self, scenario_id: str):
if scenario_id not in DRIFT_CONFIGS:
raise ValueError(f"Unknown scenario: {scenario_id}. "
f"Available: {list(DRIFT_CONFIGS.keys())}")
self.scenario_id = scenario_id
self.config = DRIFT_CONFIGS[scenario_id]
self.current_world: dict = dict(self.config["initial"])
self.drifted: bool = False
self.secondary_drifted: bool = False
def inject(self) -> Dict[str, Any]:
"""
Inject primary drift. Returns the mutation dict for the mock API.
Should be passed to /_admin/mutate.
"""
self.current_world = dict(self.config["mutated"])
self.drifted = True
return self.current_world
def inject_secondary(self) -> Dict[str, Any]:
"""
Inject secondary drift (expert scenarios with two drift events).
Returns mutation dict, or empty dict if no secondary drift defined.
"""
key = "secondary_mutated" if "secondary_mutated" in self.config else "final_mutated"
if key not in self.config:
return {}
self.current_world = dict(self.config[key])
self.secondary_drifted = True
return self.current_world
def get_initial(self) -> Dict[str, Any]:
return dict(self.config["initial"])
def get_world(self) -> Dict[str, Any]:
return self.current_world
def get_drift_type(self) -> str:
return self.config["drift_type"]
def get_world_truth(self) -> Dict[str, Any]:
"""
Ground truth for belief scoring.
Uses secondary/final mutated world for expert scenarios.
"""
for key in ("final_mutated", "secondary_mutated", "mutated"):
if key in self.config:
return dict(self.config[key])
return dict(self.config["mutated"])
def get_transient_error_step(self) -> int:
"""Returns the step at which a transient 503 should be simulated (EX1)."""
return self.config.get("transient_error_step", -1)
def get_secondary_drift_step(self) -> int:
"""Returns the step for secondary drift injection (EX2, EX3)."""
return self.config.get("secondary_drift_step", -1)
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