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// Copyright 2015 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package command
import (
"context"
"errors"
"fmt"
"os"
"os/signal"
"go.etcd.io/etcd/client"
"github.com/urfave/cli"
)
// NewWatchCommand returns the CLI command for "watch".
func NewWatchCommand() cli.Command {
return cli.Command{
Name: "watch",
Usage: "watch a key for changes",
ArgsUsage: "<key>",
Flags: []cli.Flag{
cli.BoolFlag{Name: "forever, f", Usage: "forever watch a key until CTRL+C"},
cli.IntFlag{Name: "after-index", Value: 0, Usage: "watch after the given index"},
cli.BoolFlag{Name: "recursive, r", Usage: "returns all values for key and child keys"},
},
Action: func(c *cli.Context) error {
watchCommandFunc(c, mustNewKeyAPI(c))
return nil
},
}
}
// watchCommandFunc executes the "watch" command.
func watchCommandFunc(c *cli.Context, ki client.KeysAPI) {
if len(c.Args()) == 0 {
handleError(c, ExitBadArgs, errors.New("key required"))
}
key := c.Args()[0]
recursive := c.Bool("recursive")
forever := c.Bool("forever")
index := c.Int("after-index")
stop := false
w := ki.Watcher(key, &client.WatcherOptions{AfterIndex: uint64(index), Recursive: recursive})
sigch := make(chan os.Signal, 1)
signal.Notify(sigch, os.Interrupt)
go func() {
<-sigch
os.Exit(0)
}()
for !stop {
resp, err := w.Next(context.TODO())
if err != nil {
handleError(c, ExitServerError, err)
}
if resp.Node.Dir {
continue
}
if recursive {
fmt.Printf("[%s] %s\n", resp.Action, resp.Node.Key)
}
printResponseKey(resp, c.GlobalString("output"))
if !forever {
stop = true
}
}
}
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