web3-proxy/web3_proxy/src/balance.rs

use crate::errors::Web3ProxyResult;
use fstrings::{f, format_args_f};
use migration::sea_orm;
use migration::sea_orm::prelude::Decimal;
use migration::sea_orm::{DbBackend, DbConn, FromQueryResult, Statement};
use serde::{Deserialize, Serialize};

/// Implements the balance getter
#[derive(Clone, Debug, Default, Serialize, Deserialize, FromQueryResult)]
pub struct Balance {
    pub user_id: u64,
    pub total_spent_paid_credits: Decimal,
    pub total_spent: Decimal,
    pub total_deposits: Decimal,
}

impl Balance {
    pub fn remaining(&self) -> Decimal {
        self.total_deposits - self.total_spent_paid_credits
    }

    pub async fn try_from_db(db_conn: &DbConn, user_id: u64) -> Web3ProxyResult<Option<Self>> {
        // Return early if user_id == 0
        if user_id == 0 {
            return Ok(None);
        }

        // Injecting the variable directly, should be fine because Rust is typesafe, especially with primitives
        let raw_sql = f!(r#"
            SELECT
                user.id AS user_id,
                COALESCE(SUM(admin_receipt.amount), 0) + COALESCE(SUM(chain_receipt.amount), 0) + COALESCE(SUM(stripe_receipt.amount), 0) + COALESCE(SUM(referee.one_time_bonus_applied_for_referee), 0) + COALESCE(referrer_bonus.total_bonus, 0) AS total_deposits,
                COALESCE(SUM(accounting.sum_credits_used), 0) AS total_spent_paid_credits,
                COALESCE(SUM(accounting.sum_incl_free_credits_used), 0) AS total_spent
            FROM
                user
                    LEFT JOIN
                admin_increase_balance_receipt AS admin_receipt ON user.id = admin_receipt.deposit_to_user_id
                    LEFT JOIN
                increase_on_chain_balance_receipt AS chain_receipt ON user.id = chain_receipt.deposit_to_user_id
                    LEFT JOIN
                stripe_increase_balance_receipt AS stripe_receipt ON user.id = stripe_receipt.deposit_to_user_id
                    LEFT JOIN
                referee ON user.id = referee.user_id
                    LEFT JOIN
                (SELECT referrer.user_id, SUM(referee.credits_applied_for_referrer) AS total_bonus
                FROM referrer
                        JOIN referee ON referrer.id = referee.used_referral_code
                GROUP BY referrer.user_id) AS referrer_bonus ON user.id = referrer_bonus.user_id
                    LEFT JOIN
                rpc_key ON user.id = rpc_key.user_id
                    LEFT JOIN
                rpc_accounting_v2 AS accounting ON rpc_key.id = accounting.rpc_key_id
                    LEFT JOIN
                user_tier ON user.user_tier_id = user_tier.id
                    WHERE
                user.id = {user_id};
        "#);

        let balance: Balance = match Self::find_by_statement(Statement::from_string(
            DbBackend::MySql,
            raw_sql,
            // [.into()],
        ))
        .one(db_conn)
        .await?
        {
            None => return Ok(None),
            Some(x) => x,
        };

        // Return None if there is no entry
        Ok(Some(balance))
    }
}