229 lines
6.7 KiB
Go
229 lines
6.7 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cloudcfg
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import (
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"encoding/json"
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"fmt"
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"io"
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"strings"
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"text/tabwriter"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"gopkg.in/v1/yaml"
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)
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// ResourcePrinter is an interface that knows how to print API resources
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type ResourcePrinter interface {
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// Print receives an arbitrary JSON body, formats it and prints it to a writer
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Print(string, io.Writer) error
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}
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// Identity printer simply copies the body out to the output stream
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type IdentityPrinter struct{}
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func (i *IdentityPrinter) Print(data string, w io.Writer) error {
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_, err := fmt.Fprint(w, data)
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return err
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}
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// YAMLPrinter parses JSON, and re-formats as YAML
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type YAMLPrinter struct{}
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func (y *YAMLPrinter) Print(data string, w io.Writer) error {
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var obj interface{}
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if err := json.Unmarshal([]byte(data), &obj); err != nil {
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return err
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}
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output, err := yaml.Marshal(obj)
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if err != nil {
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return err
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}
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_, err = fmt.Fprint(w, string(output))
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return err
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}
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// HumanReadablePrinter attempts to provide more elegant output
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type HumanReadablePrinter struct{}
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var podColumns = []string{"Name", "Image(s)", "Host", "Labels"}
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var replicationControllerColumns = []string{"Name", "Image(s)", "Label Query", "Replicas"}
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var serviceColumns = []string{"Name", "Label Query", "Port"}
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func (h *HumanReadablePrinter) unknown(data string, w io.Writer) error {
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_, err := fmt.Fprintf(w, "Unknown object: %s", data)
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return err
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}
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func (h *HumanReadablePrinter) printHeader(columnNames []string, w io.Writer) error {
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if _, err := fmt.Fprintf(w, "%s\n", strings.Join(columnNames, "\t")); err != nil {
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return err
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}
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var lines []string
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for _ = range columnNames {
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lines = append(lines, "----------")
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}
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_, err := fmt.Fprintf(w, "%s\n", strings.Join(lines, "\t"))
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return err
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}
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func (h *HumanReadablePrinter) makeImageList(manifest api.ContainerManifest) string {
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var images []string
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for _, container := range manifest.Containers {
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images = append(images, container.Image)
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}
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return strings.Join(images, ",")
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}
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func (h *HumanReadablePrinter) makeLabelsList(labels map[string]string) string {
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var vals []string
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for key, value := range labels {
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vals = append(vals, fmt.Sprintf("%s=%s", key, value))
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}
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return strings.Join(vals, ",")
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}
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func (h *HumanReadablePrinter) printPod(pod api.Pod, w io.Writer) error {
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_, err := fmt.Fprintf(w, "%s\t%s\t%s\t%s\n",
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pod.ID, h.makeImageList(pod.DesiredState.Manifest), pod.CurrentState.Host, h.makeLabelsList(pod.Labels))
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return err
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}
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func (h *HumanReadablePrinter) printPodList(podList api.PodList, w io.Writer) error {
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for _, pod := range podList.Items {
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if err := h.printPod(pod, w); err != nil {
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return err
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}
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}
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return nil
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}
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func (h *HumanReadablePrinter) printReplicationController(ctrl api.ReplicationController, w io.Writer) error {
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_, err := fmt.Fprintf(w, "%s\t%s\t%s\t%d\n",
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ctrl.ID, h.makeImageList(ctrl.DesiredState.PodTemplate.DesiredState.Manifest), h.makeLabelsList(ctrl.DesiredState.ReplicasInSet), ctrl.DesiredState.Replicas)
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return err
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}
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func (h *HumanReadablePrinter) printReplicationControllerList(list api.ReplicationControllerList, w io.Writer) error {
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for _, ctrl := range list.Items {
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if err := h.printReplicationController(ctrl, w); err != nil {
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return err
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}
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}
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return nil
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}
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func (h *HumanReadablePrinter) printService(svc api.Service, w io.Writer) error {
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_, err := fmt.Fprintf(w, "%s\t%s\t%d\n", svc.ID, h.makeLabelsList(svc.Labels), svc.Port)
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return err
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}
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func (h *HumanReadablePrinter) printServiceList(list api.ServiceList, w io.Writer) error {
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for _, svc := range list.Items {
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if err := h.printService(svc, w); err != nil {
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return err
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}
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}
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return nil
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}
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// TODO replace this with something that returns a concrete printer object, rather than
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// having the secondary switch below.
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func (h *HumanReadablePrinter) extractObject(data, kind string) (interface{}, error) {
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// TODO: I think this can be replaced with some reflection and a map[string]type
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switch kind {
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case "cluster#pod":
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var obj api.Pod
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if err := json.Unmarshal([]byte(data), &obj); err != nil {
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return nil, err
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}
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return obj, nil
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case "cluster#podList":
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var list api.PodList
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if err := json.Unmarshal([]byte(data), &list); err != nil {
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return nil, err
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}
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return list, nil
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case "cluster#replicationController":
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var ctrl api.ReplicationController
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if err := json.Unmarshal([]byte(data), &ctrl); err != nil {
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return nil, err
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}
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return ctrl, nil
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case "cluster#replicationControllerList":
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var list api.ReplicationControllerList
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if err := json.Unmarshal([]byte(data), &list); err != nil {
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return nil, err
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}
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return list, nil
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case "cluster#service":
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var ctrl api.Service
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if err := json.Unmarshal([]byte(data), &ctrl); err != nil {
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return nil, err
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}
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return ctrl, nil
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case "cluster#serviceList":
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var list api.ServiceList
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if err := json.Unmarshal([]byte(data), &list); err != nil {
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return nil, err
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}
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return list, nil
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default:
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return nil, fmt.Errorf("unknown kind: %s", kind)
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}
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}
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func (h *HumanReadablePrinter) Print(data string, output io.Writer) error {
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w := tabwriter.NewWriter(output, 20, 5, 3, ' ', 0)
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defer w.Flush()
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var obj interface{}
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if err := json.Unmarshal([]byte(data), &obj); err != nil {
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return err
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}
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if _, contains := obj.(map[string]interface{})["kind"]; !contains {
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return fmt.Errorf("unexpected object with no 'kind' field: %s", data)
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}
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kind := (obj.(map[string]interface{})["kind"]).(string)
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obj, err := h.extractObject(data, kind)
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if err != nil {
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return err
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}
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switch obj.(type) {
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case api.Pod:
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h.printHeader(podColumns, w)
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return h.printPod(obj.(api.Pod), w)
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case api.PodList:
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h.printHeader(podColumns, w)
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return h.printPodList(obj.(api.PodList), w)
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case api.ReplicationController:
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h.printHeader(replicationControllerColumns, w)
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return h.printReplicationController(obj.(api.ReplicationController), w)
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case api.ReplicationControllerList:
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h.printHeader(replicationControllerColumns, w)
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return h.printReplicationControllerList(obj.(api.ReplicationControllerList), w)
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case api.Service:
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h.printHeader(serviceColumns, w)
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return h.printService(obj.(api.Service), w)
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case api.ServiceList:
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h.printHeader(serviceColumns, w)
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return h.printServiceList(obj.(api.ServiceList), w)
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default:
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return h.unknown(data, w)
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}
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}
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