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inMemoryDB.go
77 lines (64 loc) · 1.13 KB
/
inMemoryDB.go
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package main
import (
"bufio"
"fmt"
"io"
"log"
"net"
"strings"
)
func main() {
li, err := net.Listen("tcp", ":8080")
if err != nil {
log.Fatalln(err)
}
defer li.Close()
for {
conn, err := li.Accept()
if err != nil {
log.Fatalln(err)
continue
}
go handle(conn)
}
}
func handle(conn net.Conn) {
defer conn.Close()
io.WriteString(conn, "\r\nIN-MEMORY DATABASE\r\n\r\n"+
"USE:\r\n"+
"\tSET key value \r\n"+
"\tGET key \r\n"+
"\tDEL key \r\n\r\n"+
"EXAMPLE:\r\n"+
"\tSET fav chocolate \r\n"+
"\tGET fav \r\n\r\n\r\n")
data := make(map[string]string)
scanner := bufio.NewScanner(conn)
for scanner.Scan() {
ln := scanner.Text()
fs := strings.Fields(ln)
if len(fs) < 1 {
continue
}
switch strings.ToUpper(fs[0]) {
case "GET":
key := fs[1]
value := data[key]
fmt.Fprintf(conn, "%\r\n", value)
case "SET":
if len(fs) != 3 {
fmt.Fprintf(conn, "EXPECTED VALUE\r\n")
continue
}
key := fs[1]
value := fs[2]
data[key] = value
case "DEL":
key := fs[1]
delete(data, key)
default:
fmt.Fprintf(conn, "INVALID COMMAND "+fs[0]+"\r\n")
continue
}
}
}