func serveDockerPage()

in cmd/internal/pages/docker.go [55:162]
92 lines of code
11 McCabe index (conditional complexity)

func serveDockerPage(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(DockerPage)-1:]
	rootDir := getRootDir(containerName)

	var data *pageData
	if containerName == "/" {
		// Get the containers.
		reqParams := info.ContainerInfoRequest{
			NumStats: 0,
		}
		conts, err := m.AllDockerContainers(&reqParams)
		if err != nil {
			http.Error(w, fmt.Sprintf("failed to get container %q with error: %v", containerName, err), http.StatusNotFound)
			return
		}
		subcontainers := make([]link, 0, len(conts))
		for _, cont := range conts {
			subcontainers = append(subcontainers, link{
				Text: getContainerDisplayName(cont.ContainerReference),
				Link: path.Join(rootDir, DockerPage, dockerutil.ContainerNameToId(cont.ContainerReference.Name)),
			})
		}

		// Get Docker status
		status, err := docker.Status()
		if err != nil {
			http.Error(w, fmt.Sprintf("failed to get docker info: %v", err), http.StatusInternalServerError)
			return
		}

		dockerStatus, driverStatus := toStatusKV(status)
		// Get Docker Images
		images, err := docker.Images()
		if err != nil {
			http.Error(w, fmt.Sprintf("failed to get docker images: %v", err), http.StatusInternalServerError)
			return
		}

		dockerContainersText := "Docker Containers"
		data = &pageData{
			DisplayName: dockerContainersText,
			ParentContainers: []link{
				{
					Text: dockerContainersText,
					Link: path.Join(rootDir, DockerPage),
				}},
			Subcontainers:      subcontainers,
			Root:               rootDir,
			DockerStatus:       dockerStatus,
			DockerDriverStatus: driverStatus,
			DockerImages:       images,
		}
	} else {
		// Get the container.
		reqParams := info.ContainerInfoRequest{
			NumStats: 60,
		}
		cont, err := m.DockerContainer(containerName[1:], &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)

		// Make a list of the parent containers and their links
		var parentContainers []link
		parentContainers = append(parentContainers, link{
			Text: "Docker Containers",
			Link: path.Join(rootDir, DockerPage),
		})
		parentContainers = append(parentContainers, link{
			Text: displayName,
			Link: path.Join(rootDir, DockerPage, dockerutil.ContainerNameToId(cont.Name)),
		})

		// 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
		}
		data = &pageData{
			DisplayName:            displayName,
			ContainerName:          escapeContainerName(cont.Name),
			ParentContainers:       parentContainers,
			Spec:                   cont.Spec,
			Stats:                  cont.Stats,
			MachineInfo:            machineInfo,
			ResourcesAvailable:     cont.Spec.HasCpu || cont.Spec.HasMemory || cont.Spec.HasNetwork,
			CpuAvailable:           cont.Spec.HasCpu,
			MemoryAvailable:        cont.Spec.HasMemory,
			NetworkAvailable:       cont.Spec.HasNetwork,
			FsAvailable:            cont.Spec.HasFilesystem,
			CustomMetricsAvailable: cont.Spec.HasCustomMetrics,
			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))
}