Beast: convert buffer to string

[WeissGotsman]

the beast version 72 does not contain beast::to_string, then which api should I use to convert from beast::multi_buffer to std::string

[vinniefalco]

to_string was provided as a way to display the contents of a buffer. For example:

multi_buffer b;
...
std:out << to_string(b.data());

The function sort of didn't belong in Beast because its expensive and there are other ways to accomplish the same result. For example, you can now write this instead:

std::out << buffers(b.data());

Alternatively you can use something other than a multi_buffer, such as a flat_buffer, and construct a string_view from it.

What is your use-case?

[WeissGotsman]

Ah, I just found the beast::buffers api right after my post.

One of my use case is performance critical: streaming real-time big data up to 20Mbps from several Websocket servers and then parsing them for analysis. So fast memory operations are preferred

[vinniefalco]

Does your parser require a single contiguous input or can it work with sequence of multiple buffers?

[WeissGotsman]

it works with sequence of multiple buffers.

It's a series of json or quasi json data

[vinniefalco]

multi_buffer is good for you then. are there any bottlenecks in Beast? Are you using a profiler?

[WeissGotsman]

I'm using Beast in a "multi-threaded, async within each thread" fashion (both http and websocket clients), and so far I haven't noticed any bottleneck, the data streaming seems consistent.

I do have done a http request per second performance comparison with wrk (https://github.com/wg/wrk), using http server crow (https://github.com/ipkn/crow) on a dual Xeon E5 2665 cpu machine, the performance is around half of wrk, roughly 25000 rps.

multiple facts have been taken into accounts: only resolve host once, only reconnect on EOF or disconnection, minimum memory allocation during requests, etc.

[vinniefalco]

Please let me know what I can do to help to make sure Beast does what you need!

25K rps is no joke, I'm getting around 5K and I have a pretty powerful gaming rig although we're probably comparing apples to kiwis at this point.

[WeissGotsman]

Sure, and glad to to see beast is evolving actively.

[vinniefalco]

Just wondering, have you starred the repo?

[WeissGotsman]

I follow you instead.. ;)

vinnie, focus on your boost incubator, once admitted, it could bring you 10x stars!

[vinniefalco]

LMAO