rapid-ztx/merch/for_agent.js

Rapid ZTX module

/**
 * Copyright (c) 2017 Lucky Byte, Inc.
 */
const debug = require('debug')('ztx');


/**
 * 查询代理商的平台商户
 * 
 * 商户选择可以有 2 种策略，第一种是每个代理商配置固定的商户，第二种是配置一组商户，
 * 每次交易时从中选择一个合适的商户(当前的策略是选择交易额最低的商户)
 *
 * 参数:
 *    agent:     代理商的 UUID
 *    amount:    交易金额，以分为单位
 *
 * 返回:
 *    失败抛出异常
 */
const get_for_agent = async (agent, amount) => {
    if (!agent || !amount) {
        throw new Error('get_for_agent 参数无效');
    }

    // 查询自套现参数配置中的商户使用策略
    const params = await unique_db.one(`
        select merch_policy, merchs from rapid_ctod_params limit 1
    `);

    // 使用代理商配置的交易商户
    if (params.merch_policy == 1) {
        return await get_by_agent(agent);
    }

    // 查询交易额最少的商户
    return await get_by_amount(params, amount);
}


/**
 * 查询代理商配置的平台商户，查询结果用箭头指示：
 *
 * +-------+    +---------+    +--------+
 * | 代理商 | -> | 平台商户 | -> | 银联商户 |
 * +-------+    +---------+    +--------+
 *                   ^
 *                   ^
 */
const get_by_agent = async (agent) => {
    return await unique_db.one(`
        select * from rapid_merchs where uuid = (
            select merch from rapid_ctod_agents where uuid = $1
        )
    `, [
        agent
    ]);
}


/**
 * 从可用的一组商户中查询当天交易额最少的商户
 * 选择时，会考虑商户的单笔最低金额和最高金额，仅在此区间的商户会被选择
 */
const get_by_amount = async (params, amount) => {
    if (!params.merchs || params.merchs.length == 0) {
        throw new Error('未配置自套现交易商户，请检查参数配置');
    }

    return await unique_db.one(`
        select m.*, coalesce((
            select coalesce(amount, 0) as amount from rapid_merch_limit 
            where merch = m.uuid and date = CURRENT_DATE
        ), 0) as amt_day
        from rapid_merchs as m
        where m.disabled = false and m.uuid in ($1:csv) and
            (m.trctrl->>'amt_per_min')::int <  $2 and
            (m.trctrl->>'amt_per_max')::int >= $2
        order by amt_day limit 1
    `, [
        params.merchs, amount / 100
    ]);
}


module.exports = get_for_agent;