open-consul/command/kv_import.go

148 lines
3.2 KiB
Go

package command
import (
"bytes"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"github.com/hashicorp/consul/api"
)
// KVImportCommand is a Command implementation that is used to import
// a KV tree stored as JSON
type KVImportCommand struct {
BaseCommand
// testStdin is the input for testing.
testStdin io.Reader
}
func (c *KVImportCommand) Synopsis() string {
return "Imports a tree stored as JSON to the KV store"
}
func (c *KVImportCommand) Help() string {
helpText := `
Usage: consul kv import [DATA]
Imports key-value pairs to the key-value store from the JSON representation
generated by the "consul kv export" command.
The data can be read from a file by prefixing the filename with the "@"
symbol. For example:
$ consul kv import @filename.json
Or it can be read from stdin using the "-" symbol:
$ cat filename.json | consul kv import -
Alternatively the data may be provided as the final parameter to the command,
though care must be taken with regards to shell escaping.
For a full list of options and examples, please see the Consul documentation.
` + c.BaseCommand.Help()
return strings.TrimSpace(helpText)
}
func (c *KVImportCommand) Run(args []string) int {
f := c.BaseCommand.NewFlagSet(c)
if err := c.BaseCommand.Parse(args); err != nil {
return 1
}
// Check for arg validation
args = f.Args()
data, err := c.dataFromArgs(args)
if err != nil {
c.UI.Error(fmt.Sprintf("Error! %s", err))
return 1
}
// Create and test the HTTP client
client, err := c.BaseCommand.HTTPClient()
if err != nil {
c.UI.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
return 1
}
var entries []*kvExportEntry
if err := json.Unmarshal([]byte(data), &entries); err != nil {
c.UI.Error(fmt.Sprintf("Cannot unmarshal data: %s", err))
return 1
}
for _, entry := range entries {
value, err := base64.StdEncoding.DecodeString(entry.Value)
if err != nil {
c.UI.Error(fmt.Sprintf("Error base 64 decoding value for key %s: %s", entry.Key, err))
return 1
}
pair := &api.KVPair{
Key: entry.Key,
Flags: entry.Flags,
Value: value,
}
if _, err := client.KV().Put(pair, nil); err != nil {
c.UI.Error(fmt.Sprintf("Error! Failed writing data for key %s: %s", pair.Key, err))
return 1
}
c.UI.Info(fmt.Sprintf("Imported: %s", pair.Key))
}
return 0
}
func (c *KVImportCommand) dataFromArgs(args []string) (string, error) {
var stdin io.Reader = os.Stdin
if c.testStdin != nil {
stdin = c.testStdin
}
switch len(args) {
case 0:
return "", errors.New("Missing DATA argument")
case 1:
default:
return "", fmt.Errorf("Too many arguments (expected 1, got %d)", len(args))
}
data := args[0]
if len(data) == 0 {
return "", errors.New("Empty DATA argument")
}
switch data[0] {
case '@':
data, err := ioutil.ReadFile(data[1:])
if err != nil {
return "", fmt.Errorf("Failed to read file: %s", err)
}
return string(data), nil
case '-':
if len(data) > 1 {
return data, nil
}
var b bytes.Buffer
if _, err := io.Copy(&b, stdin); err != nil {
return "", fmt.Errorf("Failed to read stdin: %s", err)
}
return b.String(), nil
default:
return data, nil
}
}