197 lines
11 KiB
Python
197 lines
11 KiB
Python
"""Durable MCP calculation submission and owner-scoped result retrieval.
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Only safe server-owned binding fields are persisted. OAuth tokens and context
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handles are never used to resume a calculation.
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"""
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from datetime import datetime, timezone
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from uuid import uuid5, NAMESPACE_URL
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from fastapi import HTTPException
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from app.mcp.models import BoundContext, QueryResult, PageInfo
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from app.infra.db.postgresql.calculation_jobs import CalculationJobRepository
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QUEUED_TOOLS = frozenset({
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"run_burst_location", "run_leakage_identification", "run_burst_detection",
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"run_simulation", "run_burst_simulation", "run_contaminant_simulation",
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"analyze_valve_closure", "analyze_flushing", "analyze_pressure_regulation",
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"optimize_sensor_placement", "save_simulation_scenario", "create_sensor_placement",
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})
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CONTROL_TOOLS = frozenset({"get_calculation_job", "get_calculation_result", "cancel_calculation_job", "list_calculation_jobs"})
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BINDING_FIELDS = {"project_id", "subject", "client_id", "native_session_id", "purpose", "parent_session_id", "task_id", "run_id", "execution_request_id", "tool_cap", "permission_cap", "task_scope_cap"}
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def durable_binding(binding: BoundContext) -> dict:
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return binding.model_dump(mode="json", include=BINDING_FIELDS)
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def restore_binding(document: dict) -> BoundContext:
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# Expiration governs admission via a context handle; durable work has its own
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# lifecycle and must revalidate identity, membership and run on every use.
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return BoundContext.model_validate({**document, "context_handle": "durable-calculation", "expires_at": datetime.max.replace(tzinfo=timezone.utc)})
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def should_queue(tool, args) -> bool:
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return tool.name in QUEUED_TOOLS and (not tool.mutating or not args.dry_run)
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def envelope(source: str, data, *, job_id="list", page=None) -> QueryResult:
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return QueryResult(source=source, source_ref="calculation:" + str(job_id), queried_at=datetime.now(timezone.utc), semantics="task", data=data, page=page, truncated=bool(page and (page.offset or page.has_more)),
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data_gaps=["Calculation status and queue receipts are not analytical evidence."])
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def public_job(row: dict) -> dict:
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fields = {"job_id", "status", "tool", "created_at", "started_at", "finished_at", "updated_at", "error"}
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from fastapi.encoders import jsonable_encoder
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return {**jsonable_encoder({key: row[key] for key in fields if key in row}), "poll_after_ms": 1500}
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async def submit_calculation(scope, binding, tool, args, call_id: str) -> QueryResult:
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from app.mcp.query_service import authorize_query
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await authorize_query(scope, binding, tool, args)
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if binding.purpose == "task_reader":
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raise HTTPException(403, "Read-only task agents cannot start calculations")
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if tool.mutating:
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from app.mcp.mutation_service import (
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preview_change, check_digest, mutation_arguments, retryable_capacity_rejection,
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)
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from app.infra.db.postgresql.mcp_queries import McpQueryRepository
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mutation_repo = McpQueryRepository(scope.connection, scope.project.project_id)
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mutation_key = "mutation:" + binding.subject + ":" + binding.native_session_id
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approved_parameters = {"tool": tool.name, "arguments": mutation_arguments(args, preview=False)}
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async with scope.connection.transaction():
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await mutation_repo.lock_receipt(mutation_key, str(args.request_id))
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previous = await mutation_repo.receipt(mutation_key, str(args.request_id))
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if previous:
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if previous["parameters"] != approved_parameters:
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raise HTTPException(409, "request_id already has different parameters")
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if previous["result"].get("status") == "completed":
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return QueryResult.model_validate(previous["result"]["output"])
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if not retryable_capacity_rejection(previous["result"]):
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raise HTTPException(409, "Operation already started; inspect the existing calculation or mutation status")
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check_digest(args, await preview_change(scope, binding, tool.name, args))
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parameters = args.model_dump(mode="json", exclude={"context_handle"})
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request_id = str(args.request_id) if tool.mutating else call_id
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key = str(uuid5(NAMESPACE_URL, ":".join([binding.subject, binding.client_id, binding.native_session_id, str(binding.task_id), str(binding.run_id), request_id])))
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repo = CalculationJobRepository(scope.connection, scope.project.project_id)
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if binding.task_id:
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from app.mcp.query_service import task_service
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from app.mcp.contexts import verify_task
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task_repo = task_service(scope).repo
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# Share the operational transaction lock with finalization. Admission
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# cannot race a pending-job check and then publish work into a closed run.
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async with task_repo.transaction():
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await task_repo.lock(f"task:{binding.task_id}")
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await task_repo.lock(f"run:{binding.run_id}")
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await verify_task(scope, binding)
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row = await repo.enqueue(
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owner_user_id=scope.project.user_id, request_key=key, tool=tool.name,
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parameters=parameters, binding=durable_binding(binding), timeout_seconds=args.timeout_seconds,
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)
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else:
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row = await repo.enqueue(
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owner_user_id=scope.project.user_id, request_key=key, tool=tool.name,
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parameters=parameters, binding=durable_binding(binding), timeout_seconds=args.timeout_seconds,
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)
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await scope.connection.commit()
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return envelope(tool.name, public_job(row), job_id=row["job_id"])
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def check_binding(binding, row):
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original = row["binding"]
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if any(str(original.get(key)) != str(getattr(binding, key)) for key in ("subject", "client_id", "native_session_id", "task_id", "run_id", "execution_request_id")):
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raise HTTPException(403, "Calculation belongs to a different session or task run")
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async def authorize_original(scope, row):
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from app.mcp.catalog import TOOLS
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from app.mcp.query_service import authorize_query
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from app.mcp.contexts import verify_task
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original = restore_binding(row["binding"])
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tool = TOOLS[row["tool"]]
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args = tool.model.model_validate({**row["parameters"], "context_handle": "durable-calculation-context-handle"})
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if (str(scope.project.user_id) != str(row["owner_user_id"])
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or str(scope.project.project_id) != str(original.project_id)):
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raise HTTPException(403, "Calculation owner is no longer authorized")
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if original.task_id:
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await verify_task(scope, original)
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await authorize_query(scope, original, tool, args)
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return original, tool, args
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async def read_calculation_job(scope, binding, tool, args) -> QueryResult:
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repo = CalculationJobRepository(scope.connection, scope.project.project_id)
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if tool.name == "list_calculation_jobs":
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identity_scope = binding.model_dump(mode="json", include={
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"subject", "client_id", "native_session_id", "task_id", "run_id", "execution_request_id",
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})
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rows = await repo.list(owner_user_id=scope.project.user_id, binding=identity_scope, limit=args.limit + 1, offset=args.offset, status=args.status)
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return envelope(tool.name, [public_job(row) for row in rows[:args.limit]], page=PageInfo(limit=args.limit, offset=args.offset, has_more=len(rows) > args.limit))
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row = await repo.get(args.job_id, owner_user_id=scope.project.user_id)
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if row is None:
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raise HTTPException(404, "Calculation was not found")
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check_binding(binding, row)
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await authorize_original(scope, row)
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if tool.name == "cancel_calculation_job":
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if binding.purpose == "task_reader":
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raise HTTPException(403, "Read-only task agents cannot cancel calculations")
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row = await repo.cancel(args.job_id, owner_user_id=scope.project.user_id)
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await scope.connection.commit()
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if tool.name != "get_calculation_result" or row["status"] != "succeeded":
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return envelope(tool.name, public_job(row), job_id=row["job_id"])
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result = QueryResult.model_validate(row["result"])
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result = await attach_calculation_evidence(scope, row, result)
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value = result.data
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for part in args.data_path:
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if isinstance(value, dict) and part in value:
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value = value[part]
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else:
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raise HTTPException(422, "data_path must select an existing object field")
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if isinstance(value, list):
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result.data = value[args.offset:args.offset + args.limit]
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result.page = PageInfo(limit=args.limit, offset=args.offset, total=len(value), has_more=args.offset + args.limit < len(value))
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result.truncated = result.truncated or args.offset > 0 or result.page.has_more
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elif args.offset:
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raise HTTPException(422, "offset requires a collection data_path")
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else:
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result.data = value
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if len(result.model_dump_json().encode()) > 11000:
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raise HTTPException(413, "Select a narrower data_path or smaller result page")
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return result
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async def execute_calculation_job(scope, row) -> QueryResult:
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"""Worker entry point; success is persisted by the fenced supervisor."""
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from app.mcp.query_service import execute_query
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original, tool, args = await authorize_original(scope, row)
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result = await execute_query(scope, original, tool, args)
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return result
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async def attach_calculation_evidence(scope, row, result):
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from app.mcp.query_service import task_service
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from app.mcp.contexts import verify_task
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original, tool, _ = await authorize_original(scope, row)
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if original.task_id:
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from app.domain.schemas.operational_task import TaskDataSnapshot
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from app.infra.db.postgresql.mcp_queries import McpQueryRepository
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repo = McpQueryRepository(scope.connection, scope.project.project_id)
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key, call_id = "calculation:" + str(row["job_id"]), "result"
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# Result lookup can leave an implicit SELECT transaction open. End it so
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# evidence and its receipt commit together before returning a response.
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await scope.connection.commit()
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task_repo = task_service(scope).repo
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# Match operational finalization's lock order: event lock, then task.
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async with task_repo.transaction():
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await repo.lock_receipt(key, call_id)
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previous = await repo.receipt(key, call_id)
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if previous:
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return QueryResult.model_validate(previous["result"])
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await task_repo.lock(f"task:{original.task_id}")
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await verify_task(scope, original)
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result.source_ref = key
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evidence, _ = await task_service(scope).record_data_snapshot(original.task_id, TaskDataSnapshot(
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source=tool.name, source_ref=key, queried_at=result.queried_at, origin=result.origin,
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data=result.model_dump(mode="json"), truncated=result.truncated))
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result.evidence_id = evidence.evidence_id
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await repo.save_receipt(key, call_id, {"job_id": str(row["job_id"])}, result.model_dump(mode="json"))
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return result
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