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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 omnictl
import (
"context"
"fmt"
"regexp"
"github.com/cosi-project/runtime/pkg/resource"
"github.com/cosi-project/runtime/pkg/state"
"github.com/spf13/cobra"
"github.com/siderolabs/omni/client/pkg/client"
"github.com/siderolabs/omni/client/pkg/cosi/labels"
"github.com/siderolabs/omni/client/pkg/omni/resources"
"github.com/siderolabs/omni/client/pkg/omnictl/internal/access"
"github.com/siderolabs/omni/client/pkg/omnictl/output"
)
var getCmdFlags struct {
namespace string
output string
selector string
idRegexp string
watch bool
}
// getCmd represents the get (resources) command.
var getCmd = &cobra.Command{
Use: "get <type> [<id>]",
Aliases: []string{"g"},
Short: "Get a specific resource or list of resources.",
Long: `Similar to 'kubectl get', 'omnictl get' returns a set of resources from the OS.
To get a list of all available resource definitions, issue 'omnictl get rd'`,
Example: "",
Args: cobra.RangeArgs(1, 2),
RunE: func(cmd *cobra.Command, args []string) error {
return access.WithClient(getResources(cmd, args))
},
}
//nolint:gocognit,gocyclo,cyclop,maintidx
func getResources(cmd *cobra.Command, args []string) func(ctx context.Context, client *client.Client) error {
return func(ctx context.Context, client *client.Client) error {
st := client.Omni().State()
var (
resourceType = resource.Type(args[0]) //nolint:unconvert
resourceID resource.ID
)
if len(args) > 1 {
resourceID = args[1]
}
rd, err := resolveResourceType(ctx, st, resourceType)
if err != nil {
return err
}
if !cmd.Flags().Lookup("namespace").Changed {
getCmdFlags.namespace = rd.TypedSpec().DefaultNamespace
}
var labelQuery []resource.LabelQueryOption
if getCmdFlags.selector != "" {
if resourceID != "" {
return fmt.Errorf("cannot specify both resource ID and selector")
}
var query *resource.LabelQuery
query, err = labels.ParseQuery(getCmdFlags.selector)
if err != nil {
return err
}
labelQuery = append(labelQuery, resource.RawLabelQuery(*query))
}
var idQuery []resource.IDQueryOption
if getCmdFlags.idRegexp != "" {
if resourceID != "" {
return fmt.Errorf("cannot specify both resource ID and ID regexp")
}
var idRegexp *regexp.Regexp
idRegexp, err = regexp.Compile(getCmdFlags.idRegexp)
if err != nil {
return fmt.Errorf("invalid ID regexp: %w", err)
}
idQuery = append(idQuery, resource.IDRegexpMatch(idRegexp))
}
out, err := output.NewWriter(getCmdFlags.output)
if err != nil {
return err
}
defer out.Flush() //nolint:errcheck
if err = out.WriteHeader(rd, getCmdFlags.watch); err != nil {
return err
}
md := resource.NewMetadata(getCmdFlags.namespace, rd.TypedSpec().Type, resourceID, resource.VersionUndefined)
switch {
case resourceID == "" && !getCmdFlags.watch:
items, err := st.List(ctx, md,
state.WithLabelQuery(labelQuery...),
state.WithIDQuery(idQuery...),
)
if err != nil {
return err
}
for _, item := range items.Items {
if err = out.WriteResource(item, state.EventType(0)); err != nil {
return err
}
}
case resourceID == "" && getCmdFlags.watch:
watchCh := make(chan state.Event)
err := st.WatchKind(ctx, md, watchCh,
state.WithBootstrapContents(true),
state.WatchWithLabelQuery(labelQuery...),
state.WatchWithIDQuery(idQuery...),
)
if err != nil {
return err
}
bootstrapped := false
watchLoopKind:
for {
select {
case e := <-watchCh:
if e.Type == state.Errored {
return fmt.Errorf("watch error: %w", e.Error)
}
if e.Type == state.Bootstrapped {
bootstrapped = true
if err = out.Flush(); err != nil {
return err
}
continue
}
if e.Resource == nil {
continue
}
if err = out.WriteResource(e.Resource, e.Type); err != nil {
return err
}
if bootstrapped {
if err = out.Flush(); err != nil {
return err
}
}
case <-ctx.Done():
break watchLoopKind
}
}
case resourceID != "" && !getCmdFlags.watch:
res, err := st.Get(ctx, md)
if err != nil {
return err
}
if err = out.WriteResource(res, state.EventType(0)); err != nil {
return err
}
case resourceID != "" && getCmdFlags.watch:
watchCh := make(chan state.Event)
err := st.Watch(ctx, md, watchCh)
if err != nil {
return err
}
watchLoop:
for {
select {
case e := <-watchCh:
if e.Type == state.Errored {
return fmt.Errorf("watch error: %w", e.Error)
}
if e.Resource == nil {
continue
}
if err = out.WriteResource(e.Resource, e.Type); err != nil {
return err
}
if err = out.Flush(); err != nil {
return err
}
case <-ctx.Done():
break watchLoop
}
}
}
return nil
}
}
func init() {
getCmd.PersistentFlags().StringVarP(&getCmdFlags.namespace, "namespace", "n", resources.DefaultNamespace, "The resource namespace.")
getCmd.PersistentFlags().BoolVarP(&getCmdFlags.watch, "watch", "w", false, "Watch the resource state.")
getCmd.PersistentFlags().StringVarP(&getCmdFlags.output, "output", "o", "table", "Output format (json, table, yaml, jsonpath).")
getCmd.PersistentFlags().StringVarP(&getCmdFlags.selector, "selector", "l", "", "Selector (label query) to filter on, supports '=' and '==' (e.g. -l key1=value1,key2=value2)")
getCmd.PersistentFlags().StringVar(&getCmdFlags.idRegexp, "id-match-regexp", "", "Match resource ID against a regular expression.")
if err := getCmd.RegisterFlagCompletionFunc("output", output.CompleteOutputArg); err != nil {
panic(err)
}
RootCmd.AddCommand(getCmd)
}