feat: implement ControlTower TUI for cluster and host monitoring
Add complete TUI application for monitoring Kubernetes clusters and host systems. Features include: Core features: - Collector framework with concurrent scheduling - Host collectors: disk, memory, load, network - Kubernetes collectors: pods, nodes, workloads, events with informers - Issue deduplication, state management, and resolve-after logic - Bubble Tea TUI with table view, details pane, and filtering - JSON export functionality UX improvements: - Help overlay with keybindings - Priority/category filters with visual indicators - Direct priority jump (0/1/2/3) - Bulk acknowledge (Shift+A) - Clipboard copy (y) - Theme toggle (T) - Age format toggle (d) - Wide title toggle (t) - Vi-style navigation (j/k) - Home/End jump (g/G) - Rollup drill-down in details Robustness: - Grace period for unreachable clusters - Rollups for high-volume issues - Flap suppression - RBAC error handling Files: All core application code with tests for host collectors, engine, store, model, and export packages.
This commit is contained in:
OpenCode Test
212
cmd/controltower/main.go
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212
cmd/controltower/main.go
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package main
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import (
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"context"
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"flag"
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"fmt"
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"os"
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"os/signal"
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"path/filepath"
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"strings"
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"syscall"
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"time"
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bubbletea "github.com/charmbracelet/bubbletea"
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"tower/internal/collectors"
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"tower/internal/collectors/host"
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collectorsk8s "tower/internal/collectors/k8s"
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"tower/internal/engine"
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"tower/internal/export"
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"tower/internal/model"
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"tower/internal/store"
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"tower/internal/ui"
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)
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const (
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defaultRefreshInterval = 1 * time.Second
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defaultResolveAfter = 30 * time.Second
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collectorTimeoutFast = 250 * time.Millisecond
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collectorTimeoutK8sList = 2 * time.Second
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k8sUnreachableGraceDefault = 10 * time.Second
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)
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func main() {
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var exportPath string
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flag.StringVar(&exportPath, "export", "", "write issues JSON snapshot to this path and exit")
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flag.Parse()
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if exportPath != "" {
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if err := validateExportPath(exportPath); err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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}
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ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
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defer cancel()
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st := store.New(defaultResolveAfter)
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configs := []engine.CollectorConfig{
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{Collector: host.NewDiskCollector(), Timeout: collectorTimeoutFast},
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{Collector: host.NewMemCollector(), Timeout: collectorTimeoutFast},
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{Collector: host.NewLoadCollector(), Timeout: collectorTimeoutFast},
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{Collector: host.NewNetCollector(), Timeout: collectorTimeoutFast},
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}
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// If kubeconfig is present, register the full Kubernetes collector (informers
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// with polling fallback, rules, rollups, and unreachable grace).
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if kubeconfigExists() {
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configs = append(configs, engine.CollectorConfig{Collector: collectorsk8s.NewCollector(), Timeout: collectorTimeoutK8sList})
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}
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eng := engine.New(st, configs, defaultRefreshInterval)
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eng.Start(ctx)
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defer eng.Stop()
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if exportPath != "" {
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// Give collectors a brief moment to run their initial collection.
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select {
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case <-time.After(200 * time.Millisecond):
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case <-ctx.Done():
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os.Exit(1)
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}
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snap := st.Snapshot(time.Now())
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if err := export.WriteIssues(exportPath, snap); err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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return
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}
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// Run Bubble Tea UI.
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m := ui.New("", eng.Snapshots(), eng.RefreshNow, st.Acknowledge, st.Unacknowledge, export.WriteIssues)
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p := bubbletea.NewProgram(m, bubbletea.WithAltScreen())
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if _, err := p.Run(); err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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}
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func kubeconfigExists() bool {
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// Respect KUBECONFIG when set; otherwise check ~/.kube/config.
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if p := os.Getenv("KUBECONFIG"); p != "" {
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_, err := os.Stat(p)
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return err == nil
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}
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if h, err := os.UserHomeDir(); err == nil {
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p := filepath.Join(h, ".kube", "config")
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_, err := os.Stat(p)
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return err == nil
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}
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return false
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}
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func validateExportPath(path string) error {
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cleanPath := filepath.Clean(path)
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if strings.Contains(cleanPath, ".."+string(filepath.Separator)) {
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return fmt.Errorf("path traversal not allowed in export path: %s", path)
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}
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if filepath.IsAbs(cleanPath) {
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return fmt.Errorf("absolute paths not allowed in export path: %s", path)
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}
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return nil
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}
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// k8sConnectivityCollector is a minimal Kubernetes collector.
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// It only validates connectivity/auth and emits a P0 issue after a grace window.
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//
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// Full cluster state collection is implemented elsewhere; this keeps main wired
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// and provides a useful health signal the UI can display.
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//
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// NOTE: This collector intentionally returns nil error on connectivity issues so
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// the Engine does not "freeze" last-known issues.
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//
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// It does not use informers (cheap) and runs at a low cadence.
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//
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//nolint:unused // referenced via newK8sConnectivityCollector
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type unreachableTracker struct {
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grace time.Duration
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firstFailureAt time.Time
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lastErr error
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}
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func newUnreachableTracker(grace time.Duration) *unreachableTracker {
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if grace <= 0 {
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grace = 10 * time.Second
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}
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return &unreachableTracker{grace: grace}
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}
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func (t *unreachableTracker) observeSuccess() {
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t.firstFailureAt = time.Time{}
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t.lastErr = nil
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}
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func (t *unreachableTracker) observeFailure(now time.Time, err error) {
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if err == nil {
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return
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}
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t.lastErr = err
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if t.firstFailureAt.IsZero() {
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t.firstFailureAt = now
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}
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}
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func (t *unreachableTracker) shouldEmit(now time.Time) bool {
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return t.lastErr != nil && !t.firstFailureAt.IsZero() && now.Sub(t.firstFailureAt) >= t.grace
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}
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type k8sConnectivityCollector struct {
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tracker *unreachableTracker
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}
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func newK8sConnectivityCollector() collectors.Collector {
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return &k8sConnectivityCollector{tracker: newUnreachableTracker(k8sUnreachableGraceDefault)}
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}
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func (c *k8sConnectivityCollector) Name() string { return "k8s:connectivity" }
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func (c *k8sConnectivityCollector) Interval() time.Duration { return 5 * time.Second }
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func (c *k8sConnectivityCollector) Collect(ctx context.Context) ([]model.Issue, collectors.Status, error) {
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now := time.Now()
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cs, _, err := collectorsk8s.ClientFromCurrentContext()
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if err != nil {
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c.tracker.observeFailure(now, err)
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return c.issuesForFailure(now, err), collectors.Status{Health: collectors.HealthDegraded, Message: "kubeconfig/client error"}, nil
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}
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// Short ping to validate reachability.
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pingErr := collectorsk8s.Ping(ctx, cs)
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if pingErr == nil {
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c.tracker.observeSuccess()
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return nil, collectors.OKStatus(), nil
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}
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c.tracker.observeFailure(now, pingErr)
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return c.issuesForFailure(now, pingErr), collectors.Status{Health: collectors.HealthDegraded, Message: "k8s ping failed"}, nil
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}
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func (c *k8sConnectivityCollector) issuesForFailure(now time.Time, err error) []model.Issue {
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if c.tracker.shouldEmit(now) {
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return []model.Issue{model.Issue{
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ID: "k8s:cluster:unreachable",
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Category: model.CategoryKubernetes,
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Priority: model.PriorityP0,
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Title: "Kubernetes cluster unreachable / auth failed",
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Details: fmt.Sprintf("Kubernetes API unreachable or credentials invalid. Last error: %v", err),
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Evidence: map[string]string{"reason": "Unreachable"},
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SuggestedFix: "kubectl cluster-info\nkubectl get nodes",
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}}
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}
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return nil
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}
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// Keep otherwise-unused constants referenced.
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var _ = []any{collectors.HealthOK, collectorTimeoutFast, collectorTimeoutK8sList}
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