Added.

pkg/cloudcfg/resource_printer.go

@@ -0,0 +1,206 @@
+package cloudcfg
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"strings"
+	"text/tabwriter"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"gopkg.in/v1/yaml"
+)
+
+type ResourcePrinter interface {
+	Print(string, io.Writer) error
+}
+
+type IdentityPrinter struct{}
+
+func (i *IdentityPrinter) Print(data string, w io.Writer) error {
+	_, err := io.Copy(w, bytes.NewBufferString(data))
+	return err
+}
+
+type YAMLPrinter struct{}
+
+func (y *YAMLPrinter) Print(data string, w io.Writer) error {
+	var obj interface{}
+	if err := json.Unmarshal([]byte(data), &obj); err != nil {
+		return err
+	}
+	output, err := yaml.Marshal(obj)
+	if err != nil {
+		return err
+	}
+	_, err = fmt.Fprint(w, string(output))
+	return err
+}
+
+type HumanReadablePrinter struct{}
+
+var taskColumns = []string{"Name", "Image(s)", "Host", "Labels"}
+var replicationControllerColumns = []string{"Name", "Image(s)", "Label Query", "Replicas"}
+var serviceColumns = []string{"Name", "Label Query", "Port"}
+
+func (h *HumanReadablePrinter) unknown(data string, w io.Writer) error {
+	_, err := fmt.Fprintf(w, "Unknown object: %s", data)
+	return err
+}
+
+func (h *HumanReadablePrinter) printHeader(columnNames []string, w io.Writer) error {
+	if _, err := fmt.Fprintf(w, "%s\n", strings.Join(columnNames, "\t")); err != nil {
+		return err
+	}
+	var lines []string
+	for _, _ = range columnNames {
+		lines = append(lines, "----------")
+	}
+	_, err := fmt.Fprintf(w, "%s\n", strings.Join(lines, "\t"))
+	return err
+}
+
+func (h *HumanReadablePrinter) makeImageList(manifest api.ContainerManifest) string {
+	var images []string
+	for _, container := range manifest.Containers {
+		images = append(images, container.Image)
+	}
+	return strings.Join(images, ",")
+}
+
+func (h *HumanReadablePrinter) makeLabelsList(labels map[string]string) string {
+	var vals []string
+	for key, value := range labels {
+		vals = append(vals, fmt.Sprintf("%s=%s", key, value))
+	}
+	return strings.Join(vals, ",")
+}
+
+func (h *HumanReadablePrinter) printTask(task api.Task, w io.Writer) error {
+	_, err := fmt.Fprintf(w, "%s\t%s\t%s\t%s\n",
+		task.ID, h.makeImageList(task.DesiredState.Manifest), task.CurrentState.Host, h.makeLabelsList(task.Labels))
+	return err
+}
+
+func (h *HumanReadablePrinter) printTaskList(taskList api.TaskList, w io.Writer) error {
+	for _, task := range taskList.Items {
+		if err := h.printTask(task, w); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (h *HumanReadablePrinter) printReplicationController(ctrl api.ReplicationController, w io.Writer) error {
+	_, err := fmt.Fprintf(w, "%s\t%s\t%s\t%d\n",
+		ctrl.ID, h.makeImageList(ctrl.DesiredState.TaskTemplate.DesiredState.Manifest), h.makeLabelsList(ctrl.DesiredState.ReplicasInSet), ctrl.DesiredState.Replicas)
+	return err
+}
+
+func (h *HumanReadablePrinter) printReplicationControllerList(list api.ReplicationControllerList, w io.Writer) error {
+	for _, ctrl := range list.Items {
+		if err := h.printReplicationController(ctrl, w); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (h *HumanReadablePrinter) printService(svc api.Service, w io.Writer) error {
+	_, err := fmt.Fprintf(w, "%s\t%s\t%d\n", svc.ID, h.makeLabelsList(svc.Labels), svc.Port)
+	return err
+}
+
+func (h *HumanReadablePrinter) printServiceList(list api.ServiceList, w io.Writer) error {
+	for _, svc := range list.Items {
+		if err := h.printService(svc, w); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (h *HumanReadablePrinter) extractObject(data, kind string) (interface{}, error) {
+	// TODO: I think this can be replaced with some reflection and a map[string]type
+	switch kind {
+	case "cluster#task":
+		var obj api.Task
+		if err := json.Unmarshal([]byte(data), &obj); err != nil {
+			return nil, err
+		}
+		return obj, nil
+	case "cluster#taskList":
+		var list api.TaskList
+		if err := json.Unmarshal([]byte(data), &list); err != nil {
+			return nil, err
+		}
+		return list, nil
+	case "cluster#replicationController":
+		var ctrl api.ReplicationController
+		if err := json.Unmarshal([]byte(data), &ctrl); err != nil {
+			return nil, err
+		}
+		return ctrl, nil
+	case "cluster#replicationControllerList":
+		var list api.ReplicationControllerList
+		if err := json.Unmarshal([]byte(data), &list); err != nil {
+			return nil, err
+		}
+		return list, nil
+	case "cluster#service":
+		var ctrl api.Service
+		if err := json.Unmarshal([]byte(data), &ctrl); err != nil {
+			return nil, err
+		}
+		return ctrl, nil
+	case "cluster#serviceList":
+		var list api.ServiceList
+		if err := json.Unmarshal([]byte(data), &list); err != nil {
+			return nil, err
+		}
+		return list, nil
+	default:
+		return nil, fmt.Errorf("Unknown kind: %s", kind)
+	}
+}
+
+func (h *HumanReadablePrinter) Print(data string, output io.Writer) error {
+	w := tabwriter.NewWriter(output, 20, 5, 3, ' ', 0)
+	defer w.Flush()
+	var obj interface{}
+	if err := json.Unmarshal([]byte(data), &obj); err != nil {
+		return err
+	}
+
+	if _, contains := obj.(map[string]interface{})["kind"]; !contains {
+		return fmt.Errorf("Unexpected object with no 'kind' field: %s", data)
+	}
+	kind := (obj.(map[string]interface{})["kind"]).(string)
+	obj, err := h.extractObject(data, kind)
+	if err != nil {
+		return err
+	}
+	switch obj.(type) {
+	case api.Task:
+		h.printHeader(taskColumns, w)
+		return h.printTask(obj.(api.Task), w)
+	case api.TaskList:
+		h.printHeader(taskColumns, w)
+		return h.printTaskList(obj.(api.TaskList), w)
+	case api.ReplicationController:
+		h.printHeader(replicationControllerColumns, w)
+		return h.printReplicationController(obj.(api.ReplicationController), w)
+	case api.ReplicationControllerList:
+		h.printHeader(replicationControllerColumns, w)
+		return h.printReplicationControllerList(obj.(api.ReplicationControllerList), w)
+	case api.Service:
+		h.printHeader(serviceColumns, w)
+		return h.printService(obj.(api.Service), w)
+	case api.ServiceList:
+		h.printHeader(serviceColumns, w)
+		return h.printServiceList(obj.(api.ServiceList), w)
+	default:
+		return h.unknown(data, w)
+	}
+}