From 513e5e7961ecc9fe8155811d6cbb6a6c77e0638d Mon Sep 17 00:00:00 2001
From: alex <alexander.vrabel@proton.me>
Date: Wed, 8 Jul 2026 20:30:16 +0200
Subject: refactored EXISTS,SET,GET to support multiple shards

---
 handlers.go | 75 ++++++++++++++++++++++++++++++-------------------------------
 1 file changed, 37 insertions(+), 38 deletions(-)

(limited to 'handlers.go')

diff --git a/handlers.go b/handlers.go
index 305d526..aefea85 100644
--- a/handlers.go
+++ b/handlers.go
@@ -3,50 +3,42 @@ package main
 import (
 	"errors"
 	"net"
-	"path/filepath"
-	"sort"
-	"strconv"
 	"time"
 )
 
 func handleGet(conn net.Conn, args []string) {
-	db.mu.Lock()
-	defer db.mu.Unlock()
-
 	if len(args) != 2 {
         err := errors.New("wrong number of arguments for 'GET'")
         conn.Write(serializeRESP(err))
 		return
     }
+    
+	key := args[1]
 
-    key := args[1]
+	result := db.Execute(key, func(s *Shard) interface{}{
+		item, exists := s.data[key]
+		if !exists {
+			return nil
+		}
 
-	item, exists := db.data[key]
-	if !exists {
-		conn.Write(serializeRESP(nil)) 
-        return
-	}
+		if item.ExpiresAt != nil && time.Now().After(*item.ExpiresAt) {
+			delete(s.data, key)
+			return nil
+		}
 
-	if item.ExpiresAt != nil && time.Now().After(*item.ExpiresAt) {
-		delete(db.data, key)
-		conn.Write(serializeRESP(nil))
-		return
-	}
+		strValue, ok := item.Value.(string)
+		if !ok {
+			err := errors.New("WRONGTYPE Operation against a key holding the wrong kind of value")
+			return err
+		}
+		return strValue
+	})
 
-	strValue, ok := item.Value.(string)
-	if !ok {
-		err := errors.New("WRONGTYPE Operation against a key holding the wrong kind of value")
-        conn.Write(serializeRESP(err))
-        return
-	}
 
-	conn.Write(serializeRESP(strValue))
+	conn.Write(serializeRESP(result))
 }
 
 func handleExists(conn net.Conn, args []string) {
-	db.mu.Lock()
-	defer db.mu.Unlock()
-
 	if len(args) != 2 {
         err := errors.New("wrong number of arguments for 'EXISTS'")
         conn.Write(serializeRESP(err))
@@ -54,13 +46,16 @@ func handleExists(conn net.Conn, args []string) {
     }
 
 	key := args[1]
+	result := db.Execute(key, func(s *Shard) interface{}{
+		_, exists := s.data[key]
+		if exists {
+			return 1
+		} else {
+			return 0
+		}
+	})
 
-	_, exists := db.data[key]
-	if exists {
-		conn.Write(serializeRESP(1))
-	} else {
-		conn.Write(serializeRESP(0))
-	}
+	conn.Write(serializeRESP(result))
 }
 
 func handleSet(conn net.Conn, args []string) {
@@ -74,12 +69,15 @@ func handleSet(conn net.Conn, args []string) {
     }
 
 	key := args[1]
-	item := Item{Value: args[2]}
+	result := db.Execute(key, func(s *Shard) interface{}{
+		item := Item{Value: args[2]}
+		s.data[key] = item
+		return SimpleString("OK")
+	})
 
-	db.data[key] = item
-	conn.Write(serializeRESP(SimpleString("OK")))
+	conn.Write(serializeRESP(result))
 }
-
+/*
 func handleDel(conn net.Conn, args []string) {
 	db.mu.Lock()
 	defer db.mu.Unlock()
@@ -730,4 +728,5 @@ func handleLrem(conn net.Conn, args []string){
 	item.Value = list
 	db.data[key] = item
 	conn.Write(serializeRESP(counter))
-}
\ No newline at end of file
+}
+*/
\ No newline at end of file
-- 
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