feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

internal/webapp/handlers_apps.go

@@ -0,0 +1,103 @@
+package webapp
+
+import "net/http"
+
+// handleApps lists the inventory rows the most recent refresh loop
+// persisted. Each row links to the detail view at /apps/:id, which
+// Phase 1 implements as a single-process summary (comm, cmdline,
+// cwd, ports, uptime).
+func (s *Server) handleApps(w http.ResponseWriter, r *http.Request) {
+	writeNoStore(w)
+	sess, _ := sessionFromContext(r.Context())
+	apps := s.inventory.Snapshot()
+	data := appsPageData{
+		basePageData: s.newBasePage(r, "Discovered apps", sess),
+		Apps:         apps,
+	}
+	if err := s.templates.Execute(w, "apps.html", data); err != nil {
+		s.deps.Logger.Printf("render apps: %v", err)
+		http.Error(w, "template error", http.StatusInternalServerError)
+	}
+}
+
+// handleAppDetail renders the detail page for a single inventory
+// row. Phase 1 has no grouping, so :id is the row index in the
+// snapshot (matching the table id column).
+func (s *Server) handleAppDetail(w http.ResponseWriter, r *http.Request) {
+	writeNoStore(w)
+	sess, _ := sessionFromContext(r.Context())
+	id := r.PathValue("id")
+	apps := s.inventory.Snapshot()
+	var found *DiscoveredApp
+	for i := range apps {
+		if idMatch(&apps[i], id, i) {
+			found = &apps[i]
+			break
+		}
+	}
+	if found == nil {
+		http.NotFound(w, r)
+		return
+	}
+	data := appDetailPageData{
+		basePageData: s.newBasePage(r, "App: "+found.Name, sess),
+		App:          *found,
+	}
+	if err := s.templates.Execute(w, "app_detail.html", data); err != nil {
+		s.deps.Logger.Printf("render app detail: %v", err)
+		http.Error(w, "template error", http.StatusInternalServerError)
+	}
+}
+
+// idMatch matches either by pid (when id is a positive integer) or
+// by name (otherwise). Keeps URLs short and avoids leaking pids to
+// browser history.
+func idMatch(a *DiscoveredApp, id string, idx int) bool {
+	if a.Name == id {
+		return true
+	}
+	if id == pidOrIndex(a, idx) {
+		return true
+	}
+	return false
+}
+
+func pidOrIndex(a *DiscoveredApp, idx int) string {
+	if a.PID > 0 {
+		return itoa(a.PID)
+	}
+	return itoa(idx)
+}
+
+func itoa(n int) string {
+	const digits = "0123456789"
+	if n == 0 {
+		return "0"
+	}
+	neg := n < 0
+	if neg {
+		n = -n
+	}
+	var buf [20]byte
+	i := len(buf)
+	for n > 0 {
+		i--
+		buf[i] = digits[n%10]
+		n /= 10
+	}
+	if neg {
+		i--
+		buf[i] = '-'
+	}
+	return string(buf[i:])
+}
+
+type appsPageData struct {
+	basePageData
+	Apps []DiscoveredApp
+}
+
+type appDetailPageData struct {
+	basePageData
+	App DiscoveredApp
+}