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package main
import (
"bufio"
"fmt"
"net"
"os"
"redisClone/pkg/commands"
"redisClone/pkg/core"
"redisClone/pkg/pubsub"
"strings"
"time"
)
var db core.RedisDB
var hub pubsub.Hub
func main() {
shards := make([]*core.Shard, core.NumShards)
for i := 0; i < core.NumShards; i++ {
shards[i] = &core.Shard{
Data: make(map[string]core.Item),
Id: i,
}
}
db = core.RedisDB{Shards: shards}
commands.SetDB(db)
hub = pubsub.Hub{Channels: make(map[string]map[net.Conn]struct{}),}
go func() {
ticker := time.NewTicker(1 * time.Second)
for range ticker.C {
for _,shard := range db.Shards{
shard.Mu.Lock()
for k, v := range shard.Data {
if v.ExpiresAt != nil && time.Now().After(*v.ExpiresAt) {
delete(shard.Data, k)
}
}
shard.Mu.Unlock()
}
}
}()
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 func() {
hub.HandleDisconnect(conn)
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])
if cmd , ok := commands.PubSubRegistry[command]; ok {
commands.DispatchPubSub(conn, &hub, cmd, args)
} else if cmd, ok := commands.BaseRegistry[command]; ok {
res := commands.DispatchBaseCommand(db, cmd, args)
conn.Write(core.SerializeRESP(res))
} else {
conn.Write(core.SerializeRESP(fmt.Errorf("ERR unknown command '%s'", command)))
}
}
}
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