Python Requests/urllib — 监控带宽使用情况 [英] Python Requests/urllib — monitoring bandwidth usage

问题描述

我想记录我的 Python 脚本下载和上传的总字节数.

I want to log the total bytes downloaded and uploaded by my Python script.

total_downloaded_bytes = 0
def bandwidth_hook(r, *args, **kwargs):
    global total_downloaded_bytes
    total_downloaded_bytes += len(r.content)
req = requests.session()
req.hooks = {'response': bandwidth_hook}

上面的代码没有考虑 HTTP 压缩(如果我是对的)和标头的大小.

The above code doesn't take into account HTTP compression (if I'm right) and the size of headers.

有没有办法计算 requests.session 中上传和下载的总字节数?如果不是，那么脚本范围内的计数呢?

Is there a way to count total uploaded and downloaded bytes from a requests.session? If not, what about a script-wide count?

推荐答案

您可以访问 r.request 对象来计算传出字节，并且可以通过查看来确定传入字节(压缩与否)在传入请求的 content-length 标头处.这应该足以满足您通常会提出的所有请求的 99%.

You can access the r.request object to calculate outgoing bytes, and you can determine incoming bytes (compressed or not) by looking at the content-length header for the incoming request. This should suffice for 99% of all requests you normally would make.

计算头的字节大小很容易；只需将键和值的长度相加，为冒号和空格添加 4 个字节，为空行添加 2 个字节:

Calculating the byte size of headers is easy enough; just add up key and value lenghts, add 4 bytes for the colon and whitespace, plus 2 more for the blank line:

 def header_size(headers):
     return sum(len(key) + len(value) + 4 for key, value in headers.items()) + 2

还有初始行；这是请求的 {method} {path_url} HTTP/1.1{CRLF} 和响应的 HTTP/1.x {status_code} {reason}{CRLF}.您也可以使用这些长度.

There is also the initial line; that's {method} {path_url} HTTP/1.1{CRLF} for requests, and HTTP/1.x {status_code} {reason}{CRLF} for the response. Those lengths are all also available to you.

总大小为:

 request_line_size = len(r.request.method) + len(r.request.path_url) + 12
 request_size = request_line_size + header_size(r.request.headers) + int(r.request.headers.get('content-length', 0))
 response_line_size = len(r.response.reason) + 15
 response_size = response_line_size + header_size(r.headers) + int(r.headers.get('content-length', 0))
 total_size = request_size + response_size

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