GoEthemineTelegramBot/connection.go

package main

import (
	"fmt"

	"gorm.io/gorm"
	"gorm.io/driver/mysql"

	"GoEthemineTelegramBot/botsettings"
)

type ConnectionProperties struct {
	User string
	Pass string
	Host string
	Db   string
}

type Connection struct {
	GormDb         *gorm.DB
	DbOpenStr      string
	ConnProperties ConnectionProperties
}

func (c *Connection) Init() {
	c.ConnProperties.User = botsettings.DbUser()
	c.ConnProperties.Pass = botsettings.DbPassword()
	c.ConnProperties.Host = botsettings.DbHost()
	c.ConnProperties.Db   = botsettings.DbName()


	c.DbOpenStr = fmt.Sprintf("%s:%s@tcp(%s)/%s", 
		c.ConnProperties.User, c.ConnProperties.Pass, c.ConnProperties.Host, c.ConnProperties.Db)
	LogInfo.Println("Connecting with:")
	LogInfo.Println(c.DbOpenStr)

	gormDb, err := gorm.Open(mysql.Open(c.DbOpenStr), &gorm.Config{})
	if err != nil {
		LogError.Println("failed to connect database")
		LogError.Println(err)
	} else {
		LogInfo.Println("Connected to database using gorm")
	}

	c.GormDb = gormDb
}


func (c *Connection) LatestWorkerRecord(worker string) (lastWorkerRecord Worker, err error) {
	result := c.GormDb.
		Where("worker = ?", worker).
		Order("time desc").
		Limit(1).
		Find(&lastWorkerRecord)
	
	return lastWorkerRecord, result.Error
} 

func (c *Connection) LatestMinerRecord(wallet string) (lastMinerRecord Miner, err error) {
	result := c.GormDb.
		Where("wallet = ?", wallet).
		Order("time desc").
		Limit(1).
		Find(&lastMinerRecord)
	
	return lastMinerRecord, result.Error
}

func (c *Connection) ChatsWithWallet(wallet string) (ChatIds []int64, err error) {
	result := c.GormDb.Model(&User{}).
			Where("wallet = ?", wallet).
			Select("DISTINCT(chat_id)").
			Scan(&ChatIds)
	return ChatIds, result.Error
}

func (c *Connection) IsWorkerRowExists(worker string, time int64) (exists bool, err error) {
	var rowsCount int64
	result := c.GormDb.Model(&Worker{}).
		Where("worker = ? and time = ?", worker, time).
		Count(&rowsCount)
	if result.Error != nil {
		return false , result.Error
	}

	if rowsCount != 0 {
		return true, nil
	}

	return false, nil
}

// 	List of unique, not empty wallets in user table
func (c *Connection) UniqueWallets() (wallets []string, err error) {
	result := c.GormDb.Model(&User{}).
		Not("wallet = ?", "").
		Select("DISTINCT(wallet)").
		Scan(&wallets)

	return wallets, result.Error
}