feat(rulemanager): add rule filtering based on context - #911
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📝 WalkthroughWalkthroughThe change centralizes rule context matching, adds context-filtered rule creation, initializes missing prefilters, and uses scoped rules for non-Kubernetes event processing. Policy evaluation now uses the shared matcher. ChangesContext-scoped rule selection
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to Context-based rule retrieval now lazily initializes rule prefilters, but concurrent event processing or rule updates can race during that initialization and cause inconsistent behavior. Merge should wait until the shared rule state is properly synchronized. Sequence Diagram(s)sequenceDiagram
participant ReportEnrichedEvent
participant RuleCreator
participant RuleMatchesContext
ReportEnrichedEvent->>RuleCreator: CreateRulesForContext(event context)
RuleCreator->>RuleMatchesContext: Match each rule
RuleMatchesContext-->>RuleCreator: Return matching rules
RuleCreator-->>ReportEnrichedEvent: Return context-scoped rules
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 1
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Inline comments:
In `@pkg/rulemanager/rulecreator/factory.go`:
- Around line 105-114: Protect rule collection access in CreateRulesForContext
and CreateAllRules with r.mutex while iterating rules and lazily initializing
Prefilter, including synchronization with dynamic rule updates. Preserve each
method’s existing filtering and return behavior.
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Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
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📒 Files selected for processing (9)
pkg/rulemanager/rule_manager.gopkg/rulemanager/rulecreator/context_match.gopkg/rulemanager/rulecreator/context_match_test.gopkg/rulemanager/rulecreator/factory.gopkg/rulemanager/rulecreator/factory_context_test.gopkg/rulemanager/rulecreator/ruleengine_interface.gopkg/rulemanager/rulecreator/ruleengine_mock.gopkg/rulemanager/rulepolicy.gopkg/rulemanager/rulepolicy_test.go
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Signed-off-by: Khuswant Rajpurohit <khuswantrajpurohit18@gmail.com>
Signed-off-by: Khuswant Rajpurohit <khuswantrajpurohit18@gmail.com>
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matthyx
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Reviewed the context-based rule filtering change.
RuleMatchesContextcorrectly consolidates the exact/meta-tag/backward-compat matching logic that previously lived only inrulepolicy.go;rulepolicy.goand the newCreateRulesForContextboth delegate to it, so there's a single source of truth.- Verified the matching semantics against
contextdetection.EventSourceContext(kubernetes/host/standalone/container/ecs): exact tag match,context:containermeta-tag covering all container-type contexts but not host, and untagged rules defaulting to Kubernetes-only — all consistent with the pre-existing behavior inrulepolicy.goand well covered by the new table-driven tests. - The K8s hot path (
ListRulesForPod) is untouched; only non-K8s contexts now go throughCreateRulesForContext, so this doesn't add lock contention to the primary event path. - The data race CodeRabbit flagged (
Prefilterlazily written without holdingr.mutexinCreateRulesForContext/CreateAllRules) was already fixed in commit 6d7406d — both methods now taker.mutex.Lock()consistent with the other mutators infactory.go. - CI (CodeQL + full component-tests suite) is green.
No blockers. Approving.
2 participants
Summary
Implements context-based rule filtering so that rules are only evaluated against events from matching contexts (Kubernetes, Host, Standalone, ECS, Container), reducing unnecessary rule processing.
Previously, all registered rules were evaluated for every event regardless of context. This PR introduces a
context:tag convention on rules and filters them at both the retrieval and per-rule evaluation stages.Resolves the
TODO: rule filtering based on contextinrule_manager.go.Changes
Core matching logic
rulecreator/context_match.go— AddsRuleMatchesContext()as the single source of truth for context-based matching. Rules are matched viacontext:<name>tags with the following semantics:context:hostmatches Host,context:kubernetesmatches Kubernetes, etc.context:containermatches all container-type contexts (Kubernetes, Standalone, ECS, Container) but not Host.context:tags.Integration in rule_manager.go
CreateRulesForContext()instead of pod-based bindings.RuleAppliesToContext()check added inside the evaluation loop as a safety net.Interface & plumbing
ruleengine_interface.go— AddedCreateRulesForContext(ctx)to theRuleCreatorinterface.factory.go— ImplementedCreateRulesForContext()onRuleCreatorImpl, filtering viaRuleMatchesContextand initializing prefilters.ruleengine_mock.go— Mock implementation using the sameRuleMatchesContextlogic.rulepolicy.go— SimplifiedRuleAppliesToContext()to a thin bridge: resolvesnilcontext to Kubernetes, then delegates toRuleMatchesContext.Tests (4 new test files, ~40 test cases)
context_match_test.go— 20 cases covering exact match, meta-tag, backward compat, multi-tag, mixed tags.factory_context_test.go— Table-driven tests forCreateRulesForContextacross all 5 contexts, plus edge cases (empty rules, no match, prefilter init, consistency withRuleMatchesContext).rulepolicy_test.go— 11 cases forRuleAppliesToContextincludingnilcontextInfo handling.Summary by CodeRabbit
Bug Fixes
Tests