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PushResponse.ConfigVersion from the report ACK; ConfigRefresher reconciles vs. the last-applied version (settings.applied_config_version) and on a change calls bootstrap.RefreshConfig (re-pull controller.yaml + re-merge local_api) then GracefulSelfRestart. First-run records baseline (no restart); unchanged = no-op (no storm); failed pull keeps config + retries. Companion to hub v0.26.0. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01HxLA1mZurFq9kt8hneFeCs
76 lines
3.6 KiB
Go
76 lines
3.6 KiB
Go
package report
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import "log"
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// ConfigRefresher reconciles the hub-advertised config_version (from the report ACK) against the
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// controller's last-applied version and, on a change, re-pulls controller.yaml and self-restarts —
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// the pull-based config-delivery path (the hub never connects into the box; this rides the existing
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// report cycle exactly like the Phase 2 version floor).
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//
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// All side effects are injected so the reconcile is unit-testable without a real hub / filesystem /
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// process exit:
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// - Applied reads the persisted last-applied config_version (0 = none recorded yet).
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// - Record persists a newly-applied config_version.
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// - Refresh re-pulls controller.yaml from the hub and writes it (re-merging local_api). It must
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// NOT touch settings.json. A hub-unreachable / write failure returns an error.
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// - Restart triggers the graceful self-restart (process exit → Docker restart → fresh config).
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type ConfigRefresher struct {
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Applied func() int
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Record func(int) error
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Refresh func() error
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Restart func()
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Logger *log.Logger
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}
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// Reconcile applies the config-refresh decision for one report ACK. Rules (acceptance B + safety §5):
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// - ackVersion == 0 → no-op (hub didn't advertise; old hub / no config row).
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// - no version recorded yet → record the baseline WITHOUT restarting (first-ever ACK; the
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// first-boot pull already fetched the current config).
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// - ackVersion == applied → no-op (no change; this is what prevents a restart storm — after a
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// refresh, applied == ackVersion so the next report is a no-op).
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// - ackVersion != applied → Refresh; on success Record THEN Restart (record-before-restart so
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// the post-restart process sees it applied); on a failed Refresh keep the current config, do NOT
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// record, do NOT restart — retried on the next report cycle.
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func (cr *ConfigRefresher) Reconcile(ackVersion int) {
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if ackVersion == 0 {
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return // hub didn't advertise a config_version
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}
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applied := cr.Applied()
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if applied == 0 {
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// First-ever ACK carrying a config_version: record the baseline, do NOT restart (the box came
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// up on the first-boot pull, which already has the current config). Mirrors the floor's
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// first-run-records-baseline.
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if err := cr.Record(ackVersion); err != nil {
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cr.logf("[WARN] config-refresh: failed to record baseline config_version=%d: %v", ackVersion, err)
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return
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}
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cr.logf("[INFO] config-refresh: baseline config_version=%d recorded (no restart)", ackVersion)
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return
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}
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if ackVersion == applied {
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return // no change
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}
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cr.logf("[INFO] config-refresh: hub config_version=%d != applied=%d — re-pulling controller.yaml", ackVersion, applied)
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if err := cr.Refresh(); err != nil {
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// Fail-safe: keep the current config, do NOT record, do NOT restart — retry next cycle.
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cr.logf("[WARN] config-refresh: re-pull failed: %v — keeping current config, will retry next report", err)
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return
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}
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// Record BEFORE restarting so the freshly-started process sees the version as applied and does not
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// loop. (The restart is delayed, so the record persists first.)
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if err := cr.Record(ackVersion); err != nil {
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cr.logf("[WARN] config-refresh: applied config but failed to record version=%d: %v — skipping restart to avoid a loop", ackVersion, err)
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return
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}
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cr.logf("[INFO] config-refresh: applied config_version=%d — self-restarting to load it", ackVersion)
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if cr.Restart != nil {
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cr.Restart()
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}
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}
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func (cr *ConfigRefresher) logf(format string, args ...interface{}) {
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if cr.Logger != nil {
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cr.Logger.Printf(format, args...)
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}
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}
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