【数据存储】报表导出：运营数据的定时快照

---报表快照：每日零点定时采集
setontimerex(146, 60)
function Report.snapshot()
    local hm = os.date('%H%M')
    if hm ~= '0000' then return end
    local data = {
        date = os.date('%Y-%m-%d'),
        online = grobalinfo(6),
        newUsers = Report.newUserCount(),
        revenue = Report.dailyRevenue(),
        retention = Report.retentionRate(7),
    }
    Report.store[data.date] = data
    Report.exportCSV(data)
end

---CSV 导出：标准格式的文件输出
function Report.exportCSV(data)
    local csv = 'date,online,newUsers,revenue,retention\n'
    csv = csv .. string.format('%s,%d,%d,%d,%.2f\n',
        data.date, data.online, data.newUsers,
        data.revenue, data.retention)
    local file = io.open('/data/report/' .. data.date .. '.csv', 'w')
    file:write(csv)
    file:close()
end

---邮件发送给运营
function Report.emailDaily(data)
    sendmail('运营组', 8018, '日报 ' .. data.date,
        '在线' .. data.online .. ' 充值' .. data.revenue, '')
end