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get.go
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get.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package talos
import (
"context"
"fmt"
"io"
"os"
"strings"
"github.com/cosi-project/runtime/pkg/resource/meta"
"github.com/spf13/cobra"
"google.golang.org/grpc/codes"
yaml "gopkg.in/yaml.v3"
"github.com/talos-systems/talos/cmd/talosctl/cmd/talos/output"
"github.com/talos-systems/talos/cmd/talosctl/pkg/talos/helpers"
"github.com/talos-systems/talos/pkg/cli"
"github.com/talos-systems/talos/pkg/machinery/client"
"github.com/talos-systems/talos/pkg/machinery/resources/cluster"
)
var getCmdFlags struct {
insecure bool
namespace string
output string
watch bool
}
// getCmd represents the get (resources) command.
var getCmd = &cobra.Command{
Use: "get <type> [<id>]",
Aliases: []string{"g"},
SuggestFor: []string{},
Short: "Get a specific resource or list of resources.",
Long: `Similar to 'kubectl get', 'talosctl get' returns a set of resources from the OS.
To get a list of all available resource definitions, issue 'talosctl get rd'`,
Example: "",
ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
switch len(args) {
case 0:
if toComplete == "" {
return completeResource(meta.ResourceDefinitionType, true, false), cobra.ShellCompDirectiveNoFileComp
}
return completeResource(meta.ResourceDefinitionType, true, true), cobra.ShellCompDirectiveNoFileComp
case 1:
return completeResource(args[0], false, true), cobra.ShellCompDirectiveNoFileComp | cobra.ShellCompDirectiveNoSpace
}
return nil, cobra.ShellCompDirectiveError | cobra.ShellCompDirectiveNoFileComp
},
Args: cobra.RangeArgs(1, 2),
RunE: func(cmd *cobra.Command, args []string) error {
if getCmdFlags.insecure {
return WithClientMaintenance(nil, getResources(args))
}
return WithClient(getResources(args))
},
}
//nolint:gocyclo,cyclop
func getResources(args []string) func(ctx context.Context, c *client.Client) error {
return func(ctx context.Context, c *client.Client) error {
out, err := output.NewWriter(getCmdFlags.output)
if err != nil {
return err
}
resourceType := args[0]
var resourceID string
if len(args) == 2 {
resourceID = args[1]
}
defer out.Flush() //nolint:errcheck
var headerWritten bool
if getCmdFlags.watch { // get -w <type> OR get -w <type> <id>
watchClient, err := c.Resources.Watch(ctx, getCmdFlags.namespace, resourceType, resourceID)
if err != nil {
return err
}
for {
msg, err := watchClient.Recv()
if err != nil {
if err == io.EOF || client.StatusCode(err) == codes.Canceled {
return nil
}
return err
}
if msg.Metadata.GetError() != "" {
fmt.Fprintf(os.Stderr, "%s: %s\n", msg.Metadata.GetHostname(), msg.Metadata.GetError())
continue
}
if msg.Definition != nil && !headerWritten {
if e := out.WriteHeader(msg.Definition, true); e != nil {
return e
}
headerWritten = true
}
if msg.Resource != nil {
if err := out.WriteResource(msg.Metadata.GetHostname(), msg.Resource, msg.EventType); err != nil {
return err
}
if err := out.Flush(); err != nil {
return err
}
}
}
}
// get <type>
// get <type> <id>
printOut := func(parentCtx context.Context, msg client.ResourceResponse) error {
if msg.Definition != nil && !headerWritten {
if e := out.WriteHeader(msg.Definition, false); e != nil {
return e
}
headerWritten = true
}
if msg.Resource != nil {
if err := out.WriteResource(msg.Metadata.GetHostname(), msg.Resource, 0); err != nil {
return err
}
}
return nil
}
return helpers.ForEachResource(ctx, c, printOut, getCmdFlags.namespace, args...)
}
}
//nolint:gocyclo
func getResourcesResponse(args []string, clientmsg *[]client.ResourceResponse) func(ctx context.Context, c *client.Client) error {
return func(ctx context.Context, c *client.Client) error {
var resourceID string
resourceType := args[0]
namespace := getCmdFlags.namespace
if len(args) > 1 {
resourceID = args[1]
}
if resourceID != "" {
resp, err := c.Resources.Get(ctx, namespace, resourceType, resourceID)
if err != nil {
return err
}
for _, msg := range resp {
if msg.Resource == nil {
continue
}
*clientmsg = append(*clientmsg, msg)
}
} else {
listClient, err := c.Resources.List(ctx, namespace, resourceType)
if err != nil {
return err
}
for {
msg, err := listClient.Recv()
if err != nil {
if err == io.EOF || client.StatusCode(err) == codes.Canceled {
return nil
}
return err
}
if msg.Metadata.GetError() != "" {
fmt.Fprintf(os.Stderr, "%s: %s\n", msg.Metadata.GetHostname(), msg.Metadata.GetError())
continue
}
if msg.Resource == nil {
continue
}
*clientmsg = append(*clientmsg, msg)
}
}
return nil
}
}
// completeResource represents tab complete options for `get` and `get *` commands.
//
//nolint:gocyclo
func completeResource(resourceType string, hasAliasses bool, completeDot bool) []string {
var (
resourceResponse []client.ResourceResponse
resourceOptions []string
)
if WithClient(getResourcesResponse([]string{resourceType}, &resourceResponse)) != nil {
return nil
}
for _, msg := range resourceResponse {
if completeDot {
resourceOptions = append(resourceOptions, msg.Resource.Metadata().ID())
}
if !hasAliasses {
continue
}
resourceSpec, err := yaml.Marshal(msg.Resource.Spec())
if err != nil {
continue
}
var resourceSpecRaw map[string]interface{}
if yaml.Unmarshal(resourceSpec, &resourceSpecRaw) != nil {
continue
}
if aliasSlice, ok := resourceSpecRaw["aliases"].([]interface{}); ok {
for _, alias := range aliasSlice {
if !completeDot && strings.Contains(alias.(string), ".") {
continue
}
resourceOptions = append(resourceOptions, alias.(string))
}
}
}
return resourceOptions
}
// CompleteNodes represents tab completion for `--nodes` argument.
func CompleteNodes(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
var (
resourceResponse []client.ResourceResponse
nodes []string
)
if WithClientNoNodes(getResourcesResponse([]string{cluster.MemberType}, &resourceResponse)) != nil {
return nil, cobra.ShellCompDirectiveError
}
for _, msg := range resourceResponse {
var resourceSpecRaw map[string]interface{}
resourceSpec, err := yaml.Marshal(msg.Resource.Spec())
if err != nil {
continue
}
if err = yaml.Unmarshal(resourceSpec, &resourceSpecRaw); err != nil {
continue
}
if hostname, ok := resourceSpecRaw["hostname"].(string); ok {
nodes = append(nodes, hostname)
}
if addressSlice, ok := resourceSpecRaw["addresses"].([]interface{}); ok {
for _, address := range addressSlice {
nodes = append(nodes, address.(string))
}
}
}
return nodes, cobra.ShellCompDirectiveNoFileComp
}
func init() {
getCmd.Flags().StringVar(&getCmdFlags.namespace, "namespace", "", "resource namespace (default is to use default namespace per resource)")
getCmd.Flags().StringVarP(&getCmdFlags.output, "output", "o", "table", "output mode (json, table, yaml)")
getCmd.Flags().BoolVarP(&getCmdFlags.watch, "watch", "w", false, "watch resource changes")
getCmd.Flags().BoolVarP(&getCmdFlags.insecure, "insecure", "i", false, "get resources using the insecure (encrypted with no auth) maintenance service")
cli.Should(getCmd.RegisterFlagCompletionFunc("output", output.CompleteOutputArg))
addCommand(getCmd)
}