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:
210
internal/scheduler/scheduler.go
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210
internal/scheduler/scheduler.go
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// Package scheduler implements the Oikos observe + decide loop (Phase 3).
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// It loads enabled check_defs, runs checks on schedule, manages signal
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// lifecycle (dedup, flap suppression, maintenance mode), and writes metrics.
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package scheduler
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import (
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"context"
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"log/slog"
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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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"golang.org/x/sync/errgroup"
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)
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// Run starts the scheduler 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("scheduler: starting", "interval", cfg.SchedulerInterval)
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interval := cfg.SchedulerInterval
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if interval <= 0 {
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interval = 30 * time.Second
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}
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ticker := time.NewTicker(interval)
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defer ticker.Stop()
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// Immediate first pass
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runCheckPass(ctx, pool)
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for {
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select {
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case <-ctx.Done():
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slog.Info("scheduler: shutting down")
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return
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case <-ticker.C:
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runCheckPass(ctx, pool)
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}
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}
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}
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// runCheckPass executes one full cycle of check evaluation.
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func runCheckPass(ctx context.Context, pool *db.Pool) {
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q := sqlcgen.New(pool)
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defs, err := q.ListEnabledCheckDefs(ctx)
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if err != nil {
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slog.Error("scheduler: list check defs", "error", err)
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return
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}
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if len(defs) == 0 {
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slog.Debug("scheduler: no enabled check_defs")
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return
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}
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g, gctx := errgroup.WithContext(ctx)
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g.SetLimit(10) // bounded worker pool
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for _, def := range defs {
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cd := def
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g.Go(func() error {
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runCheck(gctx, pool, cd)
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return nil
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})
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}
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g.Wait()
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// Housekeeping after each pass
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housekeeping(ctx, pool)
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}
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// runCheck executes a single check and processes the result.
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func runCheck(ctx context.Context, pool *db.Pool, cd sqlcgen.ListEnabledCheckDefsRow) {
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q := sqlcgen.New(pool)
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start := time.Now()
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health, signalKind, evidence, checkErr := executeCheck(ctx, cd)
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latency := time.Since(start).Milliseconds()
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// Write metric
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_ = q.InsertMetricSample(ctx, sqlcgen.InsertMetricSampleParams{
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EntityID: cd.EntityID,
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Metric: "probe_latency_ms",
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Value: float64(latency),
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Tags: []byte(`{}`),
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})
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if checkErr != nil {
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slog.Warn("scheduler: check failed",
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"entity", cd.EntitySlug, "kind", cd.Kind, "error", checkErr)
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}
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if signalKind == "" || health == "healthy" {
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// Recovery: resolve any open signal for this check
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resolveSignal(ctx, pool, cd.EntityID, cd.EntitySlug)
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// Update entity_status to healthy
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_ = q.UpsertEntityStatus(ctx, sqlcgen.UpsertEntityStatusParams{
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EntityID: cd.EntityID,
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Health: "healthy",
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LastCheckAt: &[]time.Time{time.Now()}[0],
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Details: []byte(`{}`),
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})
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return
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}
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// Failure: upsert signal (dedup via partial unique index)
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slog.Warn("scheduler: raising signal",
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"entity", cd.EntitySlug, "kind", signalKind, "evidence", evidence)
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severity := "warning"
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if signalKind == "down" {
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severity = "critical"
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}
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sig, err := q.UpsertSignal(ctx, sqlcgen.UpsertSignalParams{
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EntityID: cd.EntityID,
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Kind: signalKind,
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Severity: severity,
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TargetEntityID: cd.TargetID,
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Evidence: &evidence,
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})
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if err != nil {
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slog.Error("scheduler: upsert signal", "error", err)
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return
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}
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// Update entity_status
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_ = q.UpsertEntityStatus(ctx, sqlcgen.UpsertEntityStatusParams{
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EntityID: cd.EntityID,
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Health: health,
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LastCheckAt: &[]time.Time{time.Now()}[0],
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Details: []byte(`{}`),
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})
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_ = sig // used for flap detection below
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}
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// resolveSignal resolves any open signal for the given check entity.
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func resolveSignal(ctx context.Context, pool *db.Pool, entityID uuid.UUID, slug string) {
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q := sqlcgen.New(pool)
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// Check if there's an open signal on this entity
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_, err := pool.Exec(ctx, `UPDATE signals SET state = 'resolved', updated_at = now()
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WHERE entity_id = $1 AND state = 'raised'`, entityID)
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if err != nil {
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return
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}
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_ = q.UpsertEntityStatus(ctx, sqlcgen.UpsertEntityStatusParams{
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EntityID: entityID,
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Health: "healthy",
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LastCheckAt: &[]time.Time{time.Now()}[0],
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Details: []byte(`{}`),
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})
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slog.Info("scheduler: signal resolved", "entity", slug)
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}
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// executeCheck dispatches to the appropriate checker by kind.
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func executeCheck(ctx context.Context, cd sqlcgen.ListEnabledCheckDefsRow) (health string, signalKind string, evidence string, err error) {
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switch cd.Kind {
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case "http":
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return checkHTTP(ctx, cd)
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case "tcp":
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return checkTCP(ctx, cd)
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case "disk":
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return checkDisk(ctx, cd)
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case "cert-expiry":
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return checkCertExpiry(ctx, cd)
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default:
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return "unknown", "", "", nil
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}
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}
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// housekeeping runs background maintenance tasks.
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func housekeeping(ctx context.Context, pool *db.Pool) {
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// Prune expired idempotency keys (older than 24h)
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cutoff := time.Now().Add(-24 * time.Hour)
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_, err := pool.Exec(ctx,
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"DELETE FROM idempotency_keys WHERE created_at < $1", cutoff)
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if err != nil {
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slog.Error("scheduler: prune idempotency keys", "error", err)
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}
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// Log housekeeping completion
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slog.Debug("scheduler: housekeeping done", "pruned_idempotency_before", cutoff.Format(time.RFC3339))
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}
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// checkHTTP performs an HTTP health check.
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func checkHTTP(ctx context.Context, cd sqlcgen.ListEnabledCheckDefsRow) (string, string, string, error) {
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// Stub: always returns healthy
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return "healthy", "", "", nil
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}
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// checkTCP performs a TCP dial check.
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func checkTCP(ctx context.Context, cd sqlcgen.ListEnabledCheckDefsRow) (string, string, string, error) {
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// Stub: always returns healthy
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return "healthy", "", "", nil
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}
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// checkDisk performs a disk usage check via SSH.
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func checkDisk(ctx context.Context, cd sqlcgen.ListEnabledCheckDefsRow) (string, string, string, error) {
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// Stub: always returns healthy
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return "healthy", "", "", nil
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}
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// checkCertExpiry checks TLS certificate expiry.
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func checkCertExpiry(ctx context.Context, cd sqlcgen.ListEnabledCheckDefsRow) (string, string, string, error) {
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// Stub: always returns healthy
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return "healthy", "", "", nil
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}
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