open-consul/command/kv_put.go

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package command
import (
"bytes"
"encoding/base64"
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"fmt"
"io"
"io/ioutil"
"os"
"strings"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/consul/command/base"
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)
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// KVPutCommand is a Command implementation that is used to write data to the
// key-value store.
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type KVPutCommand struct {
base.Command
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// testStdin is the input for testing.
testStdin io.Reader
}
func (c *KVPutCommand) Help() string {
helpText := `
Usage: consul kv put [options] KEY [DATA]
Writes the data to the given path in the key-value store. The data can be of
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any type.
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$ consul kv put config/redis/maxconns 5
The data can also be consumed from a file on disk by prefixing with the "@"
symbol. For example:
$ consul kv put config/program/license @license.lic
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Or it can be read from stdin using the "-" symbol:
$ echo "abcd1234" | consul kv put config/program/license -
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The DATA argument itself is optional. If omitted, this will create an empty
key-value pair at the specified path:
$ consul kv put webapp/beta/active
If the -base64 flag is specified, the data will be treated as base 64
encoded.
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To perform a Check-And-Set operation, specify the -cas flag with the
appropriate -modify-index flag corresponding to the key you want to perform
the CAS operation on:
$ consul kv put -cas -modify-index=844 config/redis/maxconns 5
Additional flags and more advanced use cases are detailed below.
` + c.Command.Help()
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return strings.TrimSpace(helpText)
}
func (c *KVPutCommand) Run(args []string) int {
f := c.Command.NewFlagSet(c)
cas := f.Bool("cas", false,
"Perform a Check-And-Set operation. Specifying this value also "+
"requires the -modify-index flag to be set. The default value "+
"is false.")
flags := f.Uint64("flags", 0,
"Unsigned integer value to assign to this key-value pair. This "+
"value is not read by Consul, so clients can use this value however "+
"makes sense for their use case. The default value is 0 (no flags).")
base64encoded := f.Bool("base64", false,
"Treat the data as base 64 encoded. The default value is false.")
modifyIndex := f.Uint64("modify-index", 0,
"Unsigned integer representing the ModifyIndex of the key. This is "+
"used in combination with the -cas flag.")
session := f.String("session", "",
"User-defined identifer for this session as a string. This is commonly "+
"used with the -acquire and -release operations to build robust locking, "+
"but it can be set on any key. The default value is empty (no session).")
acquire := f.Bool("acquire", false,
"Obtain a lock on the key. If the key does not exist, this operation "+
"will create the key and obtain the lock. The session must already "+
"exist and be specified via the -session flag. The default value is false.")
release := f.Bool("release", false,
"Forfeit the lock on the key at the given path. This requires the "+
"-session flag to be set. The key must be held by the session in order to "+
"be unlocked. The default value is false.")
if err := c.Command.Parse(args); err != nil {
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return 1
}
// Check for arg validation
args = f.Args()
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key, data, err := c.dataFromArgs(args)
if err != nil {
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c.UI.Error(fmt.Sprintf("Error! %s", err))
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return 1
}
dataBytes := []byte(data)
if *base64encoded {
dataBytes, err = base64.StdEncoding.DecodeString(data)
if err != nil {
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c.UI.Error(fmt.Sprintf("Error! Cannot base 64 decode data: %s", err))
}
}
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// Session is reauired for release or acquire
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if (*release || *acquire) && *session == "" {
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c.UI.Error("Error! Missing -session (required with -acquire and -release)")
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return 1
}
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// ModifyIndex is required for CAS
if *cas && *modifyIndex == 0 {
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c.UI.Error("Must specify -modify-index with -cas!")
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return 1
}
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// Create and test the HTTP client
client, err := c.Command.HTTPClient()
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
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return 1
}
pair := &api.KVPair{
Key: key,
ModifyIndex: *modifyIndex,
Flags: *flags,
Value: dataBytes,
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Session: *session,
}
switch {
case *cas:
ok, _, err := client.KV().CAS(pair, nil)
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error! Did not write to %s: %s", key, err))
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return 1
}
if !ok {
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c.UI.Error(fmt.Sprintf("Error! Did not write to %s: CAS failed", key))
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return 1
}
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c.UI.Info(fmt.Sprintf("Success! Data written to: %s", key))
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return 0
case *acquire:
ok, _, err := client.KV().Acquire(pair, nil)
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error! Failed writing data: %s", err))
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return 1
}
if !ok {
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c.UI.Error("Error! Did not acquire lock")
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return 1
}
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c.UI.Info(fmt.Sprintf("Success! Lock acquired on: %s", key))
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return 0
case *release:
ok, _, err := client.KV().Release(pair, nil)
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error! Failed writing data: %s", key))
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return 1
}
if !ok {
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c.UI.Error("Error! Did not release lock")
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return 1
}
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c.UI.Info(fmt.Sprintf("Success! Lock released on: %s", key))
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return 0
default:
if _, err := client.KV().Put(pair, nil); err != nil {
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c.UI.Error(fmt.Sprintf("Error! Failed writing data: %s", err))
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return 1
}
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c.UI.Info(fmt.Sprintf("Success! Data written to: %s", key))
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return 0
}
}
func (c *KVPutCommand) Synopsis() string {
return "Sets or updates data in the KV store"
}
func (c *KVPutCommand) dataFromArgs(args []string) (string, string, error) {
var stdin io.Reader = os.Stdin
if c.testStdin != nil {
stdin = c.testStdin
}
switch len(args) {
case 0:
return "", "", fmt.Errorf("Missing KEY argument")
case 1:
return args[0], "", nil
case 2:
default:
return "", "", fmt.Errorf("Too many arguments (expected 1 or 2, got %d)", len(args))
}
key := args[0]
data := args[1]
// Handle empty quoted shell parameters
if len(data) == 0 {
return key, "", nil
}
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switch data[0] {
case '@':
data, err := ioutil.ReadFile(data[1:])
if err != nil {
return "", "", fmt.Errorf("Failed to read file: %s", err)
}
return key, string(data), nil
case '-':
if len(data) > 1 {
return key, data, nil
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}
var b bytes.Buffer
if _, err := io.Copy(&b, stdin); err != nil {
return "", "", fmt.Errorf("Failed to read stdin: %s", err)
}
return key, b.String(), nil
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default:
return key, data, nil
}
}