Re: use libcurl to obtain the real-time speed of git clone.

On 2/18/2020 4:34 AM, Hongyi Zhao via curl-library wrote:
>> So yes, git should
>> be able to show you the current download speed with libcurl. Doesn't it
>> already do this?
> Yes.
>
> But I want to use libcurl to do more self-customized jobs.
>

libcurl can show a progress meter if you disable NOPROGRESS [1]:

curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);

   % Total    % Received % Xferd  Average Speed   Time    Time Time  Current
                                  Dload  Upload   Total   Spent Left  Speed
100 15.5M    0 15.5M    0     0  2412k      0 --:--:--  0:00:06 --:--:--
2618k

In cases where the content size isn't known it shows 100%. (Seems to me
it should show ??? or something instead?)

The way it calculates the current speed can be found lib/progress.c [1].
It calculates it approximately once every second based on the last 5
seconds. I made an example from that code to demonstrate [2].

[1]: https://github.com/curl/curl/blob/curl-7_68_0/lib/progress.c#L371
[2]: https://gist.github.com/jay/3db44871ccbe7cc089a25381135e122f

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Received on 2020-02-20