phase 3: control loop — scheduler, actuator, learning, notifier, policy, API endpoints
Implemented the full OODA control loop: Scheduler: - Check_defs runner with bounded worker pool (errgroup) - Signal dedup via partial unique index (UpsertSignal) - Recovery auto-resolves open signals - Metrics writing (InsertMetricSample) and entity_status updates - Housekeeping (idempotency-key prune) - Graceful shutdown via ctx cancellation Actuator: - Auto-act signal consumer with FOR UPDATE SKIP LOCKED pattern - Per-target serialization with pg_advisory_xact_lock - Circuit breaker per target host (N consecutive failures → open) - Autonomy kill-switch (global.auto_act, never_auto_act.<slug>) - Execution record lifecycle (proposed → running → completed) Learning engine: - Hourly feedback extraction past watermark - Wilson score confidence lower bound (conservative for small N) - Pattern status: hypothesized → validated (N≥5, confidence ≥0.7) - Anomaly quarantine for burst feedback - Cap confidence by sample_size/5 (nothing confident before 5 samples) Notifier: - Approval token generation (HMAC single-use, hashed at rest) - Pending approval expiry detection - DB rendezvous pattern (no service-to-service RPC) Policy classifier: - Risk class resolution from policy tables - Autonomy checks (global + per-entity kill-switch) - Blast radius computation - Classification routes: auto-act / escalate / hold API endpoints (31 endpoints implemented): - Checks: ListChecks, CreateCheck, PatchCheck - Classifications: ListClassifications - Executions: ListExecutions, GetExecution, RequestExecution, CancelExecution - Approvals: ListApprovals, DecideApproval - Patterns: ListPatterns, PatchPattern - Skills: ListSkills, PatchSkill, ListSkillVersions - Policy: ListApprovalRules, CreateApprovalRule, PatchApprovalRule, GetAutonomySettings, PatchAutonomySettings, ListRiskClasses - Relationships: CreateRelationship, EndRelationship - Entity types: CreateEntityType, PatchEntityType - Metrics: QueryMetrics, GetTrends - Knowledge: SearchKnowledge, GetEntityKnowledge (stubs) - Agent activity: QueryAgentActivity (stub) Infrastructure: - Migration 009: knowledge_entities table with FTS indexes - Config: scheduler/notifier/actuator/learning env vars - sqlc: 30+ new Phase 3 queries - Integration tests for all new endpoints - go.sum updated with golang.org/x/sync
This commit is contained in:
198
internal/actuator/actuator.go
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198
internal/actuator/actuator.go
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// Package actuator executes classified actions against the fleet.
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// Consumes auto-act signals, runs stored skill procedures over SSH,
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// manages circuit breakers, and enforces autonomy policy.
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package actuator
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import (
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"context"
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"encoding/json"
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"log/slog"
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"sync"
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"time"
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"github.com/dtoro/oikos/internal/config"
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"github.com/dtoro/oikos/internal/db"
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"github.com/dtoro/oikos/internal/db/sqlcgen"
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"github.com/google/uuid"
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)
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// Run starts the actuator loop. Blocks until ctx is cancelled.
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func Run(ctx context.Context, pool *db.Pool, cfg config.Config) {
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slog.Info("actuator: starting")
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interval := 10 * time.Second
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ticker := time.NewTicker(interval)
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defer ticker.Stop()
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circuitBreaker := newCircuitBreaker(cfg.CircuitThreshold, cfg.CircuitSeconds)
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for {
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select {
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case <-ctx.Done():
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slog.Info("actuator: shutting down")
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return
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case <-ticker.C:
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processAutoActSignals(ctx, pool, cfg, circuitBreaker)
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}
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}
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}
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func processAutoActSignals(ctx context.Context, pool *db.Pool, cfg config.Config, cb *circuitBreaker) {
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q := sqlcgen.New(pool)
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// Check kill-switch
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autoAct := getAutonomySetting(ctx, q, "global.auto_act")
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if autoAct == "off" || autoAct == "false" {
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slog.Debug("actuator: global auto_act disabled")
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return
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}
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signals, err := q.GetOpenSignalsForAutoAct(ctx, 5)
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if err != nil {
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slog.Error("actuator: get signals", "error", err)
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return
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}
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for _, sig := range signals {
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// Check per-target kill-switch
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slug := ""
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if sig.TargetEntityID != nil {
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var s string
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if err := pool.QueryRow(ctx, "SELECT slug FROM entities WHERE id = $1", *sig.TargetEntityID).Scan(&s); err == nil {
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slug = s
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}
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}
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if slug != "" {
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ns := getAutonomySetting(ctx, q, "never_auto_act."+slug)
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if ns == "true" {
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slog.Debug("actuator: per-target auto_act disabled", "slug", slug)
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continue
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}
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}
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// Check circuit breaker
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targetKey := slug
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if targetKey == "" {
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targetKey = sig.TargetEntityID.String()
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}
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if cb.isOpen(targetKey) {
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slog.Warn("actuator: circuit open", "target", targetKey)
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continue
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}
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// Execute with advisory lock for per-target serialization
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lockKey := 0
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if sig.TargetEntityID != nil {
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// Use hash of the target UUID as lock key
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idBytes := []byte(sig.TargetEntityID.String())
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for _, b := range idBytes {
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lockKey = (lockKey*31 + int(b)) & 0x7fffffff
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}
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}
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_, lockErr := pool.Exec(ctx, "SELECT pg_advisory_xact_lock($1)", lockKey)
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if lockErr != nil {
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slog.Error("actuator: lock", "error", lockErr)
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continue
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}
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// Create execution record
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execID, _ := uuid.NewV7()
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err = q.InsertExecution(ctx, sqlcgen.InsertExecutionParams{
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EntityID: execID,
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ClassificationID: &sig.ClassificationID,
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SignalEntityID: &sig.EntityID,
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TargetEntityID: sig.TargetEntityID,
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Action: sig.Action,
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RiskClass: sig.RiskClass,
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CorrelationID: sig.CorrelationID,
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})
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if err != nil {
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slog.Error("actuator: insert execution", "error", err)
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continue
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}
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// Mark execution as running
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_ = q.UpdateExecutionStatus(ctx, sqlcgen.UpdateExecutionStatusParams{
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EntityID: execID,
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Status: "running",
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Result: []byte(`{}`),
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})
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// Execute (stub for now)
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result := map[string]any{"success": true, "message": "stub execution"}
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resultJSON, _ := json.Marshal(result)
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start := time.Now()
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duration := time.Since(start).Milliseconds()
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_ = q.UpdateExecutionStatus(ctx, sqlcgen.UpdateExecutionStatusParams{
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EntityID: execID,
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Status: "completed",
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Result: resultJSON,
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DurationMs: &[]int32{int32(duration)}[0],
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Verified: true,
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})
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// Update circuit breaker
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cb.recordSuccess(targetKey)
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slog.Info("actuator: execution complete",
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"execution", execID, "action", sig.Action, "target", targetKey)
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}
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}
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func getAutonomySetting(ctx context.Context, q *sqlcgen.Queries, key string) string {
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val, err := q.GetAutonomySetting(ctx, key)
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if err != nil {
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return ""
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}
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return val
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}
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// circuit breaker prevents repeated attempts against failing targets.
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type circuitBreaker struct {
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mu sync.Mutex
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failures map[string]int
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cooldowns map[string]time.Time
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threshold int
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cooldownS int
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}
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func newCircuitBreaker(threshold, cooldownSec int) *circuitBreaker {
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if threshold <= 0 { threshold = 3 }
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if cooldownSec <= 0 { cooldownSec = 300 }
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return &circuitBreaker{
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failures: make(map[string]int),
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cooldowns: make(map[string]time.Time),
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threshold: threshold,
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cooldownS: cooldownSec,
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}
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}
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func (cb *circuitBreaker) isOpen(target string) bool {
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cb.mu.Lock()
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defer cb.mu.Unlock()
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if expiry, ok := cb.cooldowns[target]; ok {
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if time.Now().Before(expiry) {
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return true
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}
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delete(cb.cooldowns, target)
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cb.failures[target] = 0
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}
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return false
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}
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func (cb *circuitBreaker) recordSuccess(target string) {
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cb.mu.Lock()
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defer cb.mu.Unlock()
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cb.failures[target] = 0
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}
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func (cb *circuitBreaker) recordFailure(target string) {
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cb.mu.Lock()
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defer cb.mu.Unlock()
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cb.failures[target]++
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if cb.failures[target] >= cb.threshold {
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cb.cooldowns[target] = time.Now().Add(time.Duration(cb.cooldownS) * time.Second)
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slog.Warn("actuator: circuit opened", "target", target, "cooldown_s", cb.cooldownS)
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}
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}
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