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package main
import (
"bufio"
"fmt"
"net"
"os"
"strconv"
"strings"
)
var db RedisDB
func main() {
db = RedisDB{data: make(map[string]any)}
listener, err := net.Listen("tcp", ":6379")
if err != nil {
fmt.Println("error starting server: ", err)
os.Exit(1)
}
defer listener.Close()
fmt.Println("Redis clone listening on port 6379...")
for {
conn, err := listener.Accept()
if err != nil {
fmt.Println("Error accepting connection:", err)
continue
}
go handleConnection(conn)
}
}
func handleConnection(conn net.Conn) {
defer conn.Close()
fmt.Println("Client connected:", conn.RemoteAddr())
reader := bufio.NewReader(conn)
for {
args, err := parseRESP(reader)
if err != nil {
fmt.Println("Client disconnected or error parsing:", conn.RemoteAddr(), err)
return
}
if len(args) == 0 {
continue
}
fmt.Printf("Parsed RESP Arguments: %v\n", args)
command := strings.ToUpper(args[0])
switch {
case command == "GET" && len(args) == 2:
handleGet(conn, args[1])
case command == "SET" && len(args) == 3:
handleSet(conn, args[1], args[2])
case command == "EXISTS" && len(args) == 2:
handleExists(conn, args[1])
case command == "DEL" && len(args) == 2:
handleDel(conn, args[1])
case command == "INCR" && len(args) == 2:
handleIncr(conn, args[1])
case command == "DECR" && len(args) == 2:
handleDecr(conn, args[1])
case command == "PING" && len(args) == 1:
handlePing(conn)
case command == "FLUSHALL" && len(args) == 1:
handleFlushall(conn)
case command == "RPUSH" && len(args) >= 3:
handleRpush(conn, args)
case command == "LRANGE" && len(args) == 4:
start, err1 := strconv.Atoi(args[2])
stop, err2 := strconv.Atoi(args[3])
if err1 != nil || err2 != nil {
conn.Write([]byte("-ERR value is not an integer or out of range\r\n"))
break
}
handleLrange(conn, args[1], start, stop)
default:
conn.Write([]byte("-ERR unknown command or wrong arguments\r\n"))
}
}
}
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