67 lines
2.3 KiB
Python
67 lines
2.3 KiB
Python
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"""Flows Planner"""
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from dataclasses import dataclass, field
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from time import time
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from typing import List, Tuple
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from django.http import HttpRequest
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from structlog import get_logger
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from passbook.flows.exceptions import FlowNonApplicableError
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from passbook.flows.models import Factor, Flow
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from passbook.policies.engine import PolicyEngine
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LOGGER = get_logger()
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@dataclass
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class FlowPlan:
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"""This data-class is the output of a FlowPlanner. It holds a flat list
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of all Factors that should be run."""
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factors: List[Factor] = field(default_factory=list)
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def next(self) -> Factor:
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"""Return next pending factor from the bottom of the list"""
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factor_cls = self.factors.pop(0)
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return factor_cls
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class FlowPlanner:
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"""Execute all policies to plan out a flat list of all Factors
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that should be applied."""
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flow: Flow
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def __init__(self, flow: Flow):
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self.flow = flow
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def _check_flow_root_policies(self, request: HttpRequest) -> Tuple[bool, List[str]]:
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engine = PolicyEngine(self.flow.policies.all(), request.user, request)
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engine.build()
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return engine.result
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def plan(self, request: HttpRequest) -> FlowPlan:
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"""Check each of the flows' policies, check policies for each factor with PolicyBinding
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and return ordered list"""
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LOGGER.debug("Starting planning process", flow=self.flow)
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start_time = time()
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plan = FlowPlan()
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# First off, check the flow's direct policy bindings
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# to make sure the user even has access to the flow
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root_passing, root_passing_messages = self._check_flow_root_policies(request)
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if not root_passing:
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raise FlowNonApplicableError(root_passing_messages)
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# Check Flow policies
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for factor in self.flow.factors.order_by("order").select_subclasses():
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engine = PolicyEngine(factor.policies.all(), request.user, request)
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engine.build()
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passing, _ = engine.result
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if passing:
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LOGGER.debug("Factor passing", factor=factor)
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plan.factors.append(factor)
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end_time = time()
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LOGGER.debug(
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"Finished planning", flow=self.flow, duration_s=end_time - start_time
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)
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return plan
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