basic dictionary server with set and get todo: mutex to protect server

2 files changed, 102 insertions, 2 deletions

diff --git a/.gitignore b/.gitignore
index e69de29..f6501fa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,25 @@
+# Binaries and executables
+# (This catches the compiled files generated by 'go build')
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+bin/
+__debug_bin
+
+# OS generated files
+.DS_Store
+Thumbs.db
+
+# IDE specific files
+.idea/
+.vscode/
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
+
+# Optional: If you use a .env file for local configuration/ports
+.env
diff --git a/main.go b/main.go
index b7d2a32..ece44a2 100644
--- a/main.go
+++ b/main.go
@@ -1,7 +1,82 @@
 package main
 
-import "fmt"
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"os"
+	"strings"
+)
+
+var database map[string]string
 
 func main() {
-    fmt.Println("Hello, World!")
+	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"))
+		}
+	}
+}
\ No newline at end of file