python request block upload files

python may fail when uploading a large file, such as the server packet size limitations, can request upload module block

import os
import sys
import json
import time
import math
import hashlib

import requests

from log import log

hostName = "http://abc.example.com" 

class uploadFileSection:
	def __init__(self):
		self.user_id = '456414806'
		self.user_token = 'jeWeclbMoKXiipaUkYa1F4PsadOyyyoZ'
		
	def do_upload_slice(self, file_path, offset, size, file_name, file_md5, file_total_size, is_end):
		url = hostName + '/api/file/fileuploadSection'
		postData = {
			'userID':self.user_id,
			'userToken':self.user_token,
			'fileName':file_name, #file的名字无效，这里重新告诉服务器文件的名字
			'fileMd5':file_md5,
			'fileOffset':offset,
			'fileTotalSize':file_total_size,
			'isEnd':is_end
		}
		
		targetFile = open(file_path,'rb')
		targetFile.seek(offset)
		files = {
			'binaryFile':targetFile.read(size) #文件名无效，这里是纯二进制数据
		}
		targetFile.close()
		
		try:
			print('requests begin', url, file_path)
			print(json.dumps(postData, indent=2))
			response = requests.post(url, data=postData, files=files)
			
			data = json.loads(response.content)
			
			print(json.dumps(data, ensure_ascii=False, indent=2))
			if data['statusCode'] == 0:
				print (time.strftime("%Y-%m-%d %H:%M:%S"), sys._getframe().f_code.co_name, " success")
				return True
			else :
				print (time.strftime("%Y-%m-%d %H:%M:%S"), sys._getframe().f_code.co_name, " failed")
				return False
		except Exception as e:
			print (time.strftime("%Y-%m-%d %H:%M:%S"), sys._getframe().f_code.co_name, " get except ", e)
			print (response.content)
			exit()
			return False
			
	def getFileMd5(self, file_path):
		if os.path.isfile(file_path):
			with open(file_path, 'rb') as f:
				data = f.read()
				return hashlib.md5(data).hexdigest()
		else:
			print(file_path, " doesn't exist, no md5")
			return ""
			
	def do_upload(self, file_path):
		file_total_size = os.path.getsize(file_path)
		chunk_size = 3000
		chunks = math.ceil(file_total_size/chunk_size)
		file_path = file_path.replace('\\', '/')
		file_names = file_path.split('/')
		file_name = file_names[-1]
		file_md5 = self.getFileMd5(file_path)
		
		print ('file', file_path, 'size', file_total_size, 'chunk_size', chunk_size, 'chunks', chunks)
		
		for i in range(chunks):
			print('chunk', i)
			if i+1 == chunks:
				is_end = 1
				current_size = file_total_size % chunk_size
			else:
				is_end = 0
				current_size = chunk_size
				
			self.do_upload_slice(file_path, i*chunk_size, current_size,file_name, file_md5, file_total_size, is_end)

'''
参数
'''
if __name__ == "__main__":
	
	work = uploadFileSection()
	work.do_upload('d:/222huojian.jpg')

principle:

1.request every part of the file upload content to read, so the file name, size, will use an additional parameter to indicate the

2. After receiving the rear end of the required file according to MD5, file size, file name of the temporary file to determine which additional writing, when the file transfer is completed, the temporary file to the specified location move for processing