mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
88 lines
2.2 KiB
Go
88 lines
2.2 KiB
Go
// Copyright 2015 The etcd Authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package command
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import (
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"context"
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"errors"
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"fmt"
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"os"
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"os/signal"
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"go.etcd.io/etcd/client/v2"
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"go.etcd.io/etcd/pkg/v3/cobrautl"
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"github.com/urfave/cli"
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)
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// NewWatchCommand returns the CLI command for "watch".
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func NewWatchCommand() cli.Command {
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return cli.Command{
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Name: "watch",
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Usage: "watch a key for changes",
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ArgsUsage: "<key>",
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Flags: []cli.Flag{
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cli.BoolFlag{Name: "forever, f", Usage: "forever watch a key until CTRL+C"},
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cli.IntFlag{Name: "after-index", Value: 0, Usage: "watch after the given index"},
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cli.BoolFlag{Name: "recursive, r", Usage: "returns all values for key and child keys"},
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},
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Action: func(c *cli.Context) error {
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watchCommandFunc(c, mustNewKeyAPI(c))
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return nil
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},
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}
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}
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// watchCommandFunc executes the "watch" command.
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func watchCommandFunc(c *cli.Context, ki client.KeysAPI) {
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if len(c.Args()) == 0 {
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handleError(c, cobrautl.ExitBadArgs, errors.New("key required"))
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}
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key := c.Args()[0]
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recursive := c.Bool("recursive")
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forever := c.Bool("forever")
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index := c.Int("after-index")
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stop := false
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w := ki.Watcher(key, &client.WatcherOptions{AfterIndex: uint64(index), Recursive: recursive})
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sigch := make(chan os.Signal, 1)
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signal.Notify(sigch, os.Interrupt)
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go func() {
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<-sigch
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os.Exit(0)
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}()
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for !stop {
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resp, err := w.Next(context.TODO())
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if err != nil {
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handleError(c, cobrautl.ExitServerError, err)
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}
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if resp.Node.Dir {
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continue
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}
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if recursive {
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fmt.Printf("[%s] %s\n", resp.Action, resp.Node.Key)
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}
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printResponseKey(resp, c.GlobalString("output"))
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if !forever {
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stop = true
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}
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}
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}
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