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transfer/exporter: ensure policies are exported before stages, ensure policies for new prompt stages are included

This commit is contained in:
Jens Langhammer 2020-09-09 17:22:24 +02:00
parent 50a5959f6c
commit 6d27408a10
1 changed files with 37 additions and 14 deletions
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51
passbook/flows/transfer/exporter.py
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@ -1,6 +1,9 @@
"""Flow exporter"""
from json import dumps
from typing import Iterator
from typing import Iterator, List
from uuid import UUID
from django.db.models import Q
from passbook.flows.models import Flow, FlowStageBinding, Stage
from passbook.flows.transfer.common import DataclassEncoder, FlowBundle, FlowBundleEntry
@ -15,11 +18,24 @@ class FlowExporter:
with_policies: bool
with_stage_prompts: bool
pbm_uuids: List[UUID]
def __init__(self, flow: Flow):
self.flow = flow
self.with_policies = True
self.with_stage_prompts = True
def _prepare_pbm(self):
self.pbm_uuids = [self.flow.pbm_uuid]
for stage_subclass in Stage.__subclasses__():
if issubclass(stage_subclass, PolicyBindingModel):
self.pbm_uuids += stage_subclass.objects.filter(
flow=self.flow
).values_list("pbm_uuid", flat=True)
self.pbm_uuids += FlowStageBinding.objects.filter(target=self.flow).values_list(
"pbm_uuid", flat=True
)
def walk_stages(self) -> Iterator[FlowBundleEntry]:
"""Convert all stages attached to self.flow into FlowBundleEntry objects"""
stages = (
@ -37,21 +53,24 @@ class FlowExporter:
yield FlowBundleEntry.from_model(binding, "target", "stage", "order")
def walk_policies(self) -> Iterator[FlowBundleEntry]:
"""Walk over all policies and their respective bindings"""
pbm_uuids = [self.flow.pbm_uuid]
for stage_subclass in Stage.__subclasses__():
if issubclass(stage_subclass, PolicyBindingModel):
pbm_uuids += stage_subclass.objects.filter(flow=self.flow).values_list(
"pbm_uuid", flat=True
)
pbm_uuids += FlowStageBinding.objects.filter(target=self.flow).values_list(
"pbm_uuid", flat=True
"""Walk over all policies. This is done at the beginning of the export for stages that have
a direct foreign key to a policy."""
# Special case for PromptStage as that has a direct M2M to policy, we have to ensure
# all policies referenced in there we also include here
prompt_stages = PromptStage.objects.filter(flow=self.flow).values_list(
"pk", flat=True
)
# Add policy objects first, so they are created first
policies = Policy.objects.filter(bindings__in=pbm_uuids).select_related()
query = Q(bindings__in=self.pbm_uuids) | Q(promptstage__in=prompt_stages)
policies = Policy.objects.filter(query).select_related()
for policy in policies:
yield FlowBundleEntry.from_model(policy)
bindings = PolicyBinding.objects.filter(target__in=pbm_uuids).select_related()
def walk_policy_bindings(self) -> Iterator[FlowBundleEntry]:
"""Walk over all policybindings relative to us. This is run at the end of the export, as
we are sure all objects exist now."""
bindings = PolicyBinding.objects.filter(
target__in=self.pbm_uuids
).select_related()
for binding in bindings:
yield FlowBundleEntry.from_model(binding, "policy", "target", "order")
@ -64,14 +83,18 @@ class FlowExporter:
def export(self) -> FlowBundle:
"""Create a list of all objects including the flow"""
if self.with_policies:
self._prepare_pbm()
bundle = FlowBundle()
bundle.entries.append(FlowBundleEntry.from_model(self.flow, "slug"))
if self.with_stage_prompts:
bundle.entries.extend(self.walk_stage_prompts())
if self.with_policies:
bundle.entries.extend(self.walk_policies())
bundle.entries.extend(self.walk_stages())
bundle.entries.extend(self.walk_stage_bindings())
if self.with_policies:
bundle.entries.extend(self.walk_policies())
bundle.entries.extend(self.walk_policy_bindings())
return bundle
def export_to_string(self) -> str: