func serveContainersPage()

in cmd/internal/pages/containers.go [166:246]
67 lines of code
11 McCabe index (conditional complexity)

func serveContainersPage(m manager.Manager, w http.ResponseWriter, u *url.URL) {
	start := time.Now()

	// The container name is the path after the handler
	containerName := u.Path[len(ContainersPage)-1:]

	// Get the container.
	reqParams := info.ContainerInfoRequest{
		NumStats: 60,
	}
	cont, err := m.GetContainerInfo(containerName, &reqParams)
	if err != nil {
		http.Error(w, fmt.Sprintf("failed to get container %q with error: %v", containerName, err), http.StatusNotFound)
		return
	}
	displayName := getContainerDisplayName(cont.ContainerReference)

	// Get the MachineInfo
	machineInfo, err := m.GetMachineInfo()
	if err != nil {
		http.Error(w, fmt.Sprintf("failed to get machine info: %v", err), http.StatusInternalServerError)
		return
	}

	rootDir := getRootDir(containerName)

	// Make a list of the parent containers and their links
	pathParts := strings.Split(string(cont.Name), "/")
	parentContainers := make([]link, 0, len(pathParts))
	parentContainers = append(parentContainers, link{
		Text: "root",
		Link: path.Join(rootDir, ContainersPage),
	})
	for i := 1; i < len(pathParts); i++ {
		// Skip empty parts.
		if pathParts[i] == "" {
			continue
		}
		parentContainers = append(parentContainers, link{
			Text: pathParts[i],
			Link: path.Join(rootDir, ContainersPage, path.Join(pathParts[1:i+1]...)),
		})
	}

	// Build the links for the subcontainers.
	subcontainerLinks := make([]link, 0, len(cont.Subcontainers))
	for _, sub := range cont.Subcontainers {
		if !m.Exists(sub.Name) {
			continue
		}
		subcontainerLinks = append(subcontainerLinks, link{
			Text: getContainerDisplayName(sub),
			Link: path.Join(rootDir, ContainersPage, sub.Name),
		})
	}

	data := &pageData{
		DisplayName:            displayName,
		ContainerName:          escapeContainerName(cont.Name),
		ParentContainers:       parentContainers,
		Subcontainers:          subcontainerLinks,
		Spec:                   cont.Spec,
		Stats:                  cont.Stats,
		MachineInfo:            machineInfo,
		IsRoot:                 cont.Name == "/",
		ResourcesAvailable:     cont.Spec.HasCpu || cont.Spec.HasMemory || cont.Spec.HasNetwork || cont.Spec.HasFilesystem,
		CpuAvailable:           cont.Spec.HasCpu,
		MemoryAvailable:        cont.Spec.HasMemory,
		NetworkAvailable:       cont.Spec.HasNetwork,
		FsAvailable:            cont.Spec.HasFilesystem,
		CustomMetricsAvailable: cont.Spec.HasCustomMetrics,
		SubcontainersAvailable: len(subcontainerLinks) > 0,
		Root:                   rootDir,
	}
	err = pageTemplate.Execute(w, data)
	if err != nil {
		klog.Errorf("Failed to apply template: %s", err)
	}

	klog.V(5).Infof("Request took %s", time.Since(start))
}