202 lines
4.0 KiB
Go
202 lines
4.0 KiB
Go
package main
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import (
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"encoding/binary"
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"fmt"
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"os"
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"os/signal"
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"strings"
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"syscall"
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"time"
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"github.com/rs/zerolog/log"
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"github.com/tidwall/redcon"
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"git.tcp.direct/Mirrors/bitcask-mirror"
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)
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type server struct {
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bind string
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db *bitcask.Bitcask
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}
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func newServer(bind, dbpath string) (*server, error) {
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db, err := bitcask.Open(dbpath)
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if err != nil {
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log.Error().Err(err).Interface("dbpath", dbpath).Msg("error opening database")
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return nil, err
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}
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return &server{
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bind: bind,
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db: db,
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}, nil
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}
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func (s *server) handleSet(cmd redcon.Command, conn redcon.Conn) {
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if len(cmd.Args) != 3 && len(cmd.Args) != 4 {
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conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
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return
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}
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var ttl *time.Duration
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key := cmd.Args[1]
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value := cmd.Args[2]
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if len(cmd.Args) == 4 {
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val, n := binary.Varint(cmd.Args[3])
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if n <= 0 {
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conn.WriteError("ERR error parsing ttl")
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return
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}
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d := time.Duration(val) * time.Millisecond
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ttl = &d
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}
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if ttl != nil {
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if err := s.db.PutWithTTL(key, value, *ttl); err != nil {
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conn.WriteString(fmt.Sprintf("ERR: %s", err))
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}
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} else {
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if err := s.db.Put(key, value); err != nil {
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conn.WriteString(fmt.Sprintf("ERR: %s", err))
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}
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}
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conn.WriteString("OK")
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}
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func (s *server) handleGet(cmd redcon.Command, conn redcon.Conn) {
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if len(cmd.Args) != 2 {
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conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
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return
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}
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key := cmd.Args[1]
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value, err := s.db.Get(key)
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if err != nil {
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conn.WriteNull()
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} else {
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conn.WriteBulk(value)
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}
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}
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func (s *server) handleKeys(cmd redcon.Command, conn redcon.Conn) {
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if len(cmd.Args) != 2 {
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conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
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return
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}
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pattern := string(cmd.Args[1])
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// Fast-track condition for improved speed
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if pattern == "*" {
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conn.WriteArray(s.db.Len())
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for key := range s.db.Keys() {
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conn.WriteBulk(key)
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}
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return
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}
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// Prefix handling
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if strings.Count(pattern, "*") == 1 && strings.HasSuffix(pattern, "*") {
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prefix := strings.ReplaceAll(pattern, "*", "")
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count := 0
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keys := make([][]byte, 0)
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s.db.Scan([]byte(prefix), func(key []byte) error {
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keys = append(keys, key)
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count++
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return nil
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})
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conn.WriteArray(count)
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for _, key := range keys {
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conn.WriteBulk(key)
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}
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return
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}
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// No results means empty array
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conn.WriteArray(0)
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}
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func (s *server) handleExists(cmd redcon.Command, conn redcon.Conn) {
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if len(cmd.Args) != 2 {
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conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
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return
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}
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key := cmd.Args[1]
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if s.db.Has(key) {
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conn.WriteInt(1)
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} else {
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conn.WriteInt(0)
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}
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}
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func (s *server) handleDel(cmd redcon.Command, conn redcon.Conn) {
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if len(cmd.Args) != 2 {
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conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
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return
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}
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key := cmd.Args[1]
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if err := s.db.Delete(key); err != nil {
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conn.WriteInt(0)
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} else {
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conn.WriteInt(1)
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}
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}
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func (s *server) Shutdown() (err error) {
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err = s.db.Close()
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return
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}
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func (s *server) Run() (err error) {
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redServer := redcon.NewServerNetwork("tcp", s.bind,
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func(conn redcon.Conn, cmd redcon.Command) {
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switch strings.ToLower(string(cmd.Args[0])) {
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case "ping":
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conn.WriteString("PONG")
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case "quit":
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conn.WriteString("OK")
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conn.Close()
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case "set":
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s.handleSet(cmd, conn)
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case "get":
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s.handleGet(cmd, conn)
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case "keys":
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s.handleKeys(cmd, conn)
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case "exists":
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s.handleExists(cmd, conn)
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case "del":
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s.handleDel(cmd, conn)
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default:
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conn.WriteError("ERR unknown command '" + string(cmd.Args[0]) + "'")
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}
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},
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func(conn redcon.Conn) bool {
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return true
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},
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func(conn redcon.Conn, err error) {
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},
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)
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go func() {
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signals := make(chan os.Signal, 1)
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signal.Notify(signals, os.Interrupt, syscall.SIGTERM)
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s := <-signals
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log.Info().Msgf("Shutdown server on signal %s", s)
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redServer.Close()
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}()
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if err := redServer.ListenAndServe(); err == nil {
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return s.Shutdown()
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}
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return
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}
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