🎉 🚧 Start working on backend

backend/db/db.go

@@ -0,0 +1,82 @@
+package db
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+
+	"github.com/HexCardGames/HexDeck/types"
+	"go.mongodb.org/mongo-driver/v2/bson"
+	"go.mongodb.org/mongo-driver/v2/mongo"
+	"go.mongodb.org/mongo-driver/v2/mongo/options"
+)
+
+type DatabaseConnection struct {
+	client *mongo.Client
+}
+
+type GlobalStatsCollection struct {
+	GamesPlayed int `bson:"games_played"`
+}
+
+func (conn *DatabaseConnection) QueryRunningRooms() []*types.Room {
+	res, err := conn.client.Database("hexdeck").Collection("games").Find(context.TODO(), bson.D{{Key: "gamestate", Value: bson.D{{Key: "$ne", Value: types.StateEnded}}}})
+	if err != nil {
+		slog.Error("Loading rooms from database failed", "error", err)
+		return make([]*types.Room, 0)
+	}
+
+	var serializableRooms []SerializableRoom
+	err = res.All(context.TODO(), &serializableRooms)
+	if err != nil {
+		slog.Error("Decoding rooms from database failed", "error", err)
+		return make([]*types.Room, 0)
+	}
+	var rooms []*types.Room = make([]*types.Room, len(serializableRooms))
+	for i, serializableRoom := range serializableRooms {
+		room := serializableRoom.ToRoom()
+		rooms[i] = room
+	}
+	return rooms
+}
+
+func (conn *DatabaseConnection) InsertRoom(room *types.Room) {
+	_, err := conn.client.Database("hexdeck").Collection("games").InsertOne(context.TODO(), room)
+	if err != nil {
+		slog.Error("Error while inserting room into database", "error", err)
+	}
+}
+
+func (conn *DatabaseConnection) UpdateRoom(room *types.Room) {
+	result, err := conn.client.Database("hexdeck").Collection("games").UpdateByID(context.TODO(), room.RoomId, bson.D{{Key: "$set", Value: room}})
+	if err != nil {
+		slog.Error("Error while updating room in database", "error", err)
+	}
+	if result.MatchedCount < 1 {
+		slog.Warn(fmt.Sprintf("No collections were found while trying to update room data for room '%s'", room.RoomId))
+	}
+}
+
+func (conn *DatabaseConnection) IncrementGamesPlayed() {
+	conn.client.Database("hexdeck").Collection("global_stats").UpdateOne(context.TODO(), bson.D{}, bson.D{
+		{Key: "$inc", Value: bson.D{{Key: "games_played", Value: 1}}},
+	}, options.UpdateOne().SetUpsert(true))
+}
+
+func (conn *DatabaseConnection) QueryGlobalStats() GlobalStatsCollection {
+	res := conn.client.Database("hexdeck").Collection("global_stats").FindOne(context.TODO(), bson.D{})
+	var stats GlobalStatsCollection
+	res.Decode(&stats)
+	return stats
+}
+
+func CreateDBConnection(uri string) DatabaseConnection {
+	client, _ := mongo.Connect(options.Client().ApplyURI(uri))
+	return DatabaseConnection{client}
+}
+
+var Conn DatabaseConnection
+
+func InitDB(uri string) {
+	Conn = CreateDBConnection(uri)
+}