add AddChat on /start

db/db.go

@@ -0,0 +1,42 @@
+package db
+
+import (
+	"context"
+	"git.user-penguin.space/vladimir/all-tg-bot/config"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+	"time"
+)
+
+type chatDTO struct {
+	ID     string `bson:"_id"`
+	ChatID int64  `bson:"chat_id"`
+}
+
+var cfg *config.Config
+
+func init() {
+	cfg = config.NewConfig()
+}
+
+func AddChat(chatID int64) error {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	defer cancel()
+
+	client, err := mongo.Connect(ctx, options.Client().ApplyURI(cfg.MongoURL))
+	if err != nil {
+		return err
+	}
+
+	collection := client.Database(cfg.DBName).Collection(cfg.ChatsCollectionName)
+
+	result := collection.FindOne(ctx, bson.E{Key: "chat_id", Value: chatID})
+	if result.Err() == mongo.ErrNoDocuments {
+		if _, err := collection.InsertOne(ctx, &chatDTO{ChatID: chatID}); err != nil {
+			return err
+		}
+		return nil
+	}
+	return result.Err()
+}