Python implements video file upload in pieces

Multipart upload is a technique that splits a large file into multiple smaller chunks for upload. This technology can avoid uploading the entire file to the server at one time, thereby improving the efficiency and reliability of uploading.

The following are the basic steps to implement multipart upload using Python:

Divide the file to be uploaded into multiple small blocks, and calculate the MD5 value of each small block.
Through the HTTP protocol, each small block is uploaded to the server, and the information of the uploaded small block is recorded, such as block number, block size, MD5 value, etc.
On the client side, send splicing requests of all small blocks to the server through the HTTP protocol, summarize the MD5 values ​​of all small blocks, and compare them with the MD5 values ​​of the original file to ensure the integrity of the upload.
On the server side, all small blocks are spliced, and the MD5 value of each small block is checked whether it is consistent with the uploaded MD5 value to ensure the integrity of the upload.
The following is a simple Python code example for implementing multipart uploads:

import hashlib
import os.path
import requests
  
def upload_file(file_path, chunk_size, url):  
    file_size = os.path.getsize(file_path)  
    file_name = os.path.split(file_path)[1]
    with open(file_path, 'rb') as file:  
        for i in range(0, int(file_size // chunk_size) + 1):  
            start = i * chunk_size  
            end = start + chunk_size - 1  
            if i == file_size // chunk_size:  
                end = file_size - 1  
            chunk_md5 = hashlib.md5()  
            with open(file_path, 'rb') as f:  
                f.seek(start)  
                chunk = f.read(chunk_size)  
                while chunk:  
                    chunk_md5.update(chunk)  
                    chunk = f.read(chunk_size)  
            chunk_md5 = chunk_md5.hexdigest()  
            files = {
    
    
                'file': (file_name, chunk, "video/mp4"),
            }
            data = {
    
    'chunk': chunk, 'chunk_md5': chunk_md5, 'file_path': file_path, 'start': start}  
            response = requests.post(url, files=files, data=data)  
            if response.status_code != 200:  
                raise Exception('Upload chunk failed')

This function splits the file into chunks of size chunk_size and uploads each chunk to the specified URL. As each chunk is uploaded, it also calculates the MD5 hash of the chunk and sends it to the server along with the MD5 hash of the file itself. On the server side, all chunks can be spliced ​​and compared to the original file to ensure the integrity of the upload.