mirror of
https://github.com/etcd-io/etcd.git
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102 lines
2.4 KiB
Go
102 lines
2.4 KiB
Go
/*
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Copyright 2014 CoreOS, Inc.
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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 command
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import (
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"errors"
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"os"
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"os/signal"
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"github.com/coreos/etcd/Godeps/_workspace/src/github.com/codegangsta/cli"
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"github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/go-etcd/etcd"
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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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Flags: []cli.Flag{
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cli.BoolFlag{Name: "forever", 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", Usage: "returns all values for key and child keys"},
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},
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Action: func(c *cli.Context) {
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handleKey(c, watchCommandFunc)
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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, client *etcd.Client) (*etcd.Response, error) {
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if len(c.Args()) == 0 {
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return nil, 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 := 0
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if c.Int("after-index") != 0 {
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index = c.Int("after-index") + 1
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}
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if forever {
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sigch := make(chan os.Signal, 1)
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signal.Notify(sigch, os.Interrupt)
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stop := make(chan bool)
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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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receiver := make(chan *etcd.Response)
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errCh := make(chan error, 1)
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go func() {
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_, err := client.Watch(key, uint64(index), recursive, receiver, stop)
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errCh <- err
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}()
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for {
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select {
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case resp := <-receiver:
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printAll(resp, c.GlobalString("output"))
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case err := <-errCh:
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handleError(-1, err)
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}
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}
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} else {
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var resp *etcd.Response
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var err error
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resp, err = client.Watch(key, uint64(index), recursive, nil, nil)
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if err != nil {
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handleError(ErrorFromEtcd, err)
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}
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if err != nil {
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return nil, err
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}
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printAll(resp, c.GlobalString("output"))
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}
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return nil, nil
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}
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