server: started ShardServer

- protocol: added GenSerialKey() which securely generates an EnterSerialKey
- login server accepts a shard via LoginServer.AddShard()
- login server will pass LoginMetaData to the selected shard via ShardServer.QueueLogin()
- misc. refactoring

main.go

@@ -1,14 +1,32 @@
 package main
 
 import (
+	"log"
+
+	"github.com/CPunch/gopenfusion/config"
 	"github.com/CPunch/gopenfusion/db"
 	"github.com/CPunch/gopenfusion/server"
 )
 
 func main() {
-	db.DefaultDB, _ = db.OpenLiteDB("test.db")
-	db.DefaultDB.Setup()
+	dbHndlr, err := db.OpenLiteDB("test.db")
+	if err != nil {
+		log.Panicf("failed to open db: %v", err)
+	}
+	dbHndlr.Setup()
 
-	server := server.NewLoginServer()
-	server.Start()
+	loginServer, err := server.NewLoginServer(dbHndlr, config.LOGIN_PORT)
+	if err != nil {
+		log.Panicf("failed to create login server: %v", err)
+	}
+
+	shardServer, err := server.NewShardServer(dbHndlr, config.SHARD_PORT)
+	if err != nil {
+		log.Panicf("failed to create shard server: %v", err)
+	}
+
+	loginServer.AddShard(shardServer)
+	go loginServer.Start()
+
+	shardServer.Start()
 }