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Merge pull request #4726 from ajityagaty/mk_in_order

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etcdctl: Add command to create in-order keys.
This commit is contained in:
Xiang Li 2016-03-13 10:15:42 -07:00
commit bab8f43cb0
2 changed files with 20 additions and 5 deletions
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6
etcdctl/README.md
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@ -110,6 +110,12 @@ $ etcdctl mk /foo/new_bar "Hello world"
Hello world
```
Create a new in-order key under dir `/fooDir`:
```
$ etcdctl mk --in-order /fooDir "Hello world"
```
Create a new dir `/fooDir`, only if the key did not previously exist:
```

19
etcdctl/command/mk_command.go
View File

@ -30,6 +30,7 @@ func NewMakeCommand() cli.Command {
Usage: "make a new key with a given value",
ArgsUsage: "<key> <value>",
Flags: []cli.Flag{
cli.BoolFlag{Name: "in-order", Usage: "create in-order key under directory <key>"},
cli.IntFlag{Name: "ttl", Value: 0, Usage: "key time-to-live"},
},
Action: func(c *cli.Context) {
@ -50,13 +51,21 @@ func mkCommandFunc(c *cli.Context, ki client.KeysAPI) {
}
ttl := c.Int("ttl")
inorder := c.Bool("in-order")
var resp *client.Response
ctx, cancel := contextWithTotalTimeout(c)
// Since PrevNoExist means that the Node must not exist previously,
// this Set method always creates a new key. Therefore, mk command
// succeeds only if the key did not previously exist, and the command
// prevents one from overwriting values accidentally.
resp, err := ki.Set(ctx, key, value, &client.SetOptions{TTL: time.Duration(ttl) * time.Second, PrevExist: client.PrevNoExist})
if !inorder {
// Since PrevNoExist means that the Node must not exist previously,
// this Set method always creates a new key. Therefore, mk command
// succeeds only if the key did not previously exist, and the command
// prevents one from overwriting values accidentally.
resp, err = ki.Set(ctx, key, value, &client.SetOptions{TTL: time.Duration(ttl) * time.Second, PrevExist: client.PrevNoExist})
} else {
// If in-order flag is specified then create an inorder key under
// the directory identified by the key argument.
resp, err = ki.CreateInOrder(ctx, key, value, &client.CreateInOrderOptions{TTL: time.Duration(ttl) * time.Second})
}
cancel()
if err != nil {
handleError(ExitServerError, err)