43 lines
1.7 KiB
Haskell
43 lines
1.7 KiB
Haskell
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module Application.Helper.RoutingEngine where
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import IHP.Prelude
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import IHP.ModelSupport
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import Generated.Types
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-- | Apply active routing rules to a RequirementCandidate.
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-- Finds the highest-priority matching active rule for the candidate's hub
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-- and sets routed_to_hub_id. Returns the updated candidate.
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applyRoutingRules
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:: (?modelContext :: ModelContext)
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=> RequirementCandidate
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-> [Widget] -- to resolve widget_type for the source widget
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-> IO RequirementCandidate
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applyRoutingRules candidate widgets = do
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rules <- query @HubRoutingRule
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|> filterWhere (#status, "active")
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|> orderByDesc #priority
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|> fetch
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-- Find the hub of the source widget
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let mWidget = find (\w -> w.id == candidate.sourceWidgetId) widgets
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widgetType = maybe Nothing (\w -> Just w.widgetType) mWidget
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let matchingRule = find (ruleMatches candidate.category widgetType) rules
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case matchingRule of
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Nothing -> pure candidate
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Just rule -> do
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candidate
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|> set #routedToHubId (Just rule.targetHubId)
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|> updateRecord
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-- | A rule matches if:
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-- - source hub matches candidate's source widget's hub
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-- - match_category is null OR equals candidate category
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-- - match_widget_type is null OR equals widget type
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ruleMatches :: Text -> Maybe Text -> HubRoutingRule -> Bool
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ruleMatches category mWidgetType rule =
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categoryMatch && widgetTypeMatch
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where
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categoryMatch = isNothing rule.matchCategory
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|| rule.matchCategory == Just category
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widgetTypeMatch = isNothing rule.matchWidgetType
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|| (isJust mWidgetType && rule.matchWidgetType == mWidgetType)
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