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|
package main
import (
"bufio"
"fmt"
"net"
"os"
"strings"
)
var database map[string]string
func main() {
database = make(map[string]string)
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 handleGet(conn net.Conn, key string) {
value, exists := database[key]
if exists {
// Redis protocol format for a string reply
conn.Write([]byte("+" + value + "\r\n"))
} else {
// Redis protocol format for a Nil/Null response
conn.Write([]byte("$-1\r\n"))
}
}
func handleSet(conn net.Conn, key, value string) {
database[key] = value
conn.Write([]byte("+OK\r\n"))
}
func handleConnection(conn net.Conn) {
defer conn.Close()
fmt.Println("Client connected:", conn.RemoteAddr())
reader := bufio.NewReader(conn)
for {
message, err := reader.ReadString('\n')
if err != nil {
fmt.Println("Client disconnected:", conn.RemoteAddr())
return
}
message = strings.TrimSpace(message)
fmt.Printf("Received: %s\n", message)
args := strings.Fields(message)
if len(args) == 0 {
continue
}
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])
default:
conn.Write([]byte("-ERR unknown command or wrong arguments\r\n"))
}
}
}
|
