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kv.go
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kv.go
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package cmd
import (
"fmt"
"os"
"strings"
"unicode/utf8"
"github.com/charmbracelet/charm/kv"
"github.com/charmbracelet/charm/ui/common"
"github.com/dgraph-io/badger/v3"
"github.com/spf13/cobra"
)
var (
reverseIterate bool
keysIterate bool
valuesIterate bool
showBinary bool
delimiterIterate string
// KVCmd is the cobra.Command for a user to use the Charm key value store.
KVCmd = &cobra.Command{
Use: "kv",
Hidden: false,
Short: "Use the Charm key value store.",
Long: paragraph("Commands to set, get and delete data from your Charm Cloud backed key value store."),
Args: cobra.NoArgs,
RunE: func(cmd *cobra.Command, args []string) error {
return nil
},
}
kvSetCmd = &cobra.Command{
Use: "set KEY[@DB] VALUE",
Hidden: false,
Short: "Set a value for a key with an optional @ db.",
Args: cobra.MaximumNArgs(2),
RunE: kvSet,
}
kvGetCmd = &cobra.Command{
Use: "get KEY[@DB]",
Hidden: false,
Short: "Get a value for a key with an optional @ db.",
Args: cobra.ExactArgs(1),
RunE: kvGet,
}
kvDeleteCmd = &cobra.Command{
Use: "delete KEY[@DB]",
Hidden: false,
Short: "Delete a key with an optional @ db.",
Args: cobra.ExactArgs(1),
RunE: kvDelete,
}
kvListCmd = &cobra.Command{
Use: "list [@DB]",
Hidden: false,
Short: "List all key value pairs with an optional @ db.",
Args: cobra.MaximumNArgs(1),
RunE: kvList,
}
kvSyncCmd = &cobra.Command{
Use: "sync [@DB]",
Hidden: false,
Short: "Sync local db with latest Charm Cloud db.",
Args: cobra.MaximumNArgs(1),
RunE: kvSync,
}
kvResetCmd = &cobra.Command{
Use: "reset [@DB]",
Hidden: false,
Short: "Delete local db and pull down fresh copy from Charm Cloud.",
Args: cobra.MaximumNArgs(1),
RunE: kvReset,
}
)
func kvSet(cmd *cobra.Command, args []string) error {
k, n, err := keyParser(args[0])
if err != nil {
return err
}
db, err := openKV(n)
if err != nil {
return err
}
if len(args) == 2 {
return db.Set(k, []byte(args[1]))
}
return db.SetReader(k, os.Stdin)
}
func kvGet(cmd *cobra.Command, args []string) error {
k, n, err := keyParser(args[0])
if err != nil {
return err
}
db, err := openKV(n)
if err != nil {
return err
}
v, err := db.Get(k)
if err != nil {
return err
}
printFromKV("%s", v)
return nil
}
func kvDelete(cmd *cobra.Command, args []string) error {
k, n, err := keyParser(args[0])
if err != nil {
return err
}
db, err := openKV(n)
if err != nil {
return err
}
return db.Delete(k)
}
func kvList(cmd *cobra.Command, args []string) error {
var k string
var pf string
if keysIterate || valuesIterate {
pf = "%s\n"
} else {
pf = fmt.Sprintf("%%s%s%%s\n", delimiterIterate)
}
if len(args) == 1 {
k = args[0]
}
_, n, err := keyParser(k)
if err != nil {
return err
}
db, err := openKV(n)
if err != nil {
return err
}
if err := db.Sync(); err != nil {
return err
}
return db.View(func(txn *badger.Txn) error {
opts := badger.DefaultIteratorOptions
opts.PrefetchSize = 10
opts.Reverse = reverseIterate
if keysIterate {
opts.PrefetchValues = false
}
it := txn.NewIterator(opts)
defer it.Close() //nolint:errcheck
for it.Rewind(); it.Valid(); it.Next() {
item := it.Item()
k := item.Key()
if keysIterate {
printFromKV(pf, k)
continue
}
err := item.Value(func(v []byte) error {
if valuesIterate {
printFromKV(pf, v)
} else {
printFromKV(pf, k, v)
}
return nil
})
if err != nil {
return err
}
}
return nil
})
}
func kvSync(cmd *cobra.Command, args []string) error {
n, err := nameFromArgs(args)
if err != nil {
return err
}
db, err := openKV(n)
if err != nil {
return err
}
return db.Sync()
}
func kvReset(cmd *cobra.Command, args []string) error {
n, err := nameFromArgs(args)
if err != nil {
return err
}
db, err := openKV(n)
if err != nil {
return err
}
return db.Reset()
}
func nameFromArgs(args []string) (string, error) {
if len(args) == 0 {
return "", nil
}
_, n, err := keyParser(args[0])
if err != nil {
return "", err
}
return n, nil
}
func printFromKV(pf string, vs ...[]byte) {
nb := "(omitted binary data)"
fvs := make([]interface{}, 0)
for _, v := range vs {
if common.IsTTY() && !showBinary && !utf8.Valid(v) {
fvs = append(fvs, nb)
} else {
fvs = append(fvs, string(v))
}
}
fmt.Printf(pf, fvs...)
if common.IsTTY() && !strings.HasSuffix(pf, "\n") {
fmt.Println()
}
}
func keyParser(k string) ([]byte, string, error) {
var key, db string
ps := strings.Split(k, "@")
switch len(ps) {
case 1:
key = strings.ToLower(ps[0])
case 2:
key = strings.ToLower(ps[0])
db = strings.ToLower(ps[1])
default:
return nil, "", fmt.Errorf("bad key format, use KEY@DB")
}
return []byte(key), db, nil
}
func openKV(name string) (*kv.KV, error) {
if name == "" {
name = "charm.sh.kv.user.default"
}
return kv.OpenWithDefaults(name)
}
func init() {
kvListCmd.Flags().BoolVarP(&reverseIterate, "reverse", "r", false, "list in reverse lexicographic order")
kvListCmd.Flags().BoolVarP(&keysIterate, "keys-only", "k", false, "only print keys and don't fetch values from the db")
kvListCmd.Flags().BoolVarP(&valuesIterate, "values-only", "v", false, "only print values")
kvListCmd.Flags().BoolVarP(&showBinary, "show-binary", "b", false, "print binary values")
kvGetCmd.Flags().BoolVarP(&showBinary, "show-binary", "b", false, "print binary values")
kvListCmd.Flags().StringVarP(&delimiterIterate, "delimiter", "d", "\t", "delimiter to separate keys and values")
KVCmd.AddCommand(kvGetCmd)
KVCmd.AddCommand(kvSetCmd)
KVCmd.AddCommand(kvDeleteCmd)
KVCmd.AddCommand(kvListCmd)
KVCmd.AddCommand(kvSyncCmd)
KVCmd.AddCommand(kvResetCmd)
}