#!/usr/bin/env python
# _*_ coding:utf-8 _*_

'''
@Time  : 2019-11-11 13:30
@Author : Peanut_C
@FileName: ftp_auto_download.py
'''


import time
from ftplib import FTP
import os


remote_path = "/xxx/yy/z/" # 遠(yuǎn)端目錄
begin_time = 1500 # 任務(wù)開(kāi)始時(shí)間
end_time = 1700 # 任務(wù)結(jié)束時(shí)間


today = time.strftime("%Y%m%d") # 當(dāng)天日期
today_file = today + 'test.txt' # 得到當(dāng)天日期的目標(biāo)文件名
remote_file = remote_path + today_file # 遠(yuǎn)端文件名
local_file = '\\\\local\\' + today + '\\' + today_file # 本地文件名
log_file = 'C:\\\\log\\ftp_log.txt'


def ftp_connect():
  """用于FTP連接"""
  ftp_server = 'w.x.y.z' # ftp站點(diǎn)對(duì)應(yīng)的IP地址
  username = 'ftpuser' # 用戶名
  password = 'ftppass' # 密碼
  ftp = FTP()
  ftp.set_debuglevel(0) # 較高的級(jí)別方便排查問(wèn)題
  ftp.connect(ftp_server, 21)
  ftp.login(username, password)
  return ftp

def remote_file_exists():
  """用于FTP站點(diǎn)目標(biāo)文件存在檢測(cè)"""
  ftp = ftp_connect()
  ftp.cwd(remote_path) # 進(jìn)入目標(biāo)目錄
  remote_file_names = ftp.nlst() # 獲取文件列表
  ftp.quit()
  if today_file in remote_file_names:
    return True
  else:
    return False

def download_file():
  """用于目標(biāo)文件下載"""
  ftp = ftp_connect()
  bufsize = 1024
  fp = open(local_file, 'wb')
  ftp.set_debuglevel(0) # 較高的級(jí)別方便排查問(wèn)題
  ftp.retrbinary('RETR ' + remote_file, fp.write, bufsize)
  fp.close()
  ftp.quit()


while True:
  if int(time.strftime("%H%M")) in range(begin_time, end_time): # 判斷是否在執(zhí)行時(shí)間范圍
    if int(time.strftime("%Y%m%d")) - int(today) == 0: # 判斷是否跨日期
      while not os.path.exists(local_file): # 判斷本地是否已有文件
        if remote_file_exists(): # 判斷遠(yuǎn)端是否已有文件
          download_file() 
          with open(log_file, 'a') as f:
            f.write('\n' + time.strftime("%Y/%m/%d %H:%M:%S") + " 今日文件已下載！")
          time.sleep(60) # 下載完畢靜默1分鐘
        else:
          time.sleep(180)
          break # 注意，此處跳出循環(huán)重新判斷日期，避免周末或當(dāng)天沒(méi)文件時(shí)陷入內(nèi)層循環(huán)
      else:
        time.sleep(180)
    else:
      """如果跨日期，則根據(jù)當(dāng)前日期，更新各文件日期"""
      today = time.strftime("%Y%m%d") # 當(dāng)天日期
      today_file = today + 'test.txt' # 得到當(dāng)天日期的目標(biāo)文件名
      remote_file = remote_path + today_file # 遠(yuǎn)端文件名
      local_file = '\\\\local\\' + today + '\\' + today_file # 本地文件名
      with open(log_file, 'a') as f:
        f.write('\n' + time.strftime("%Y/%m/%d %H:%M:%S") + " 任務(wù)啟動(dòng), 文件日期已更新。")
  else:
    time.sleep(1800)