CVu, Code Critique, and D

[Russel Winder]

Hi,

CVu is the member magazine for ACCU members ­– you have to be a member to read
it. It is published every other month. In each issue there is a Code Critique.
The submissions for the previous Code Critique are presented, analysed by the
setter and a book prize given to the winner. The next Code Critique is
announced. In the distant past, Code Critiques were all C++ codes, and often
dealing with nasty dark corners. I often take it upon myself to totally ignore
the C++ (usually because the code is horrible and used in an area where C++
should never be used, e.g. string manipulation) and submit Python and D
solutions. In more recent past there have been C++ ones, but also some Python
and Java ones. Also fairly recently, the Code Critiques have been published as
the publication goes to press on the ACCU General, i.e. a public mailing list,
not the member mailing list.

I believe we have a first, Code Critique 112 is a D code. And indeed a vibe.d
one. I believe a number of people from this email list should volunteer
themselves to do a constructive critique to help educate ACCU members. With
the obvious subtext of D being a far, far better language than C++ ;-)

Below is the email from accu-general

-------------------------------------------------------------------


Code Critique 112

Hello all,
Below is the code for Code Critique number 112

As usual, please don't reply to the list with your entry but email
scc at accu.org for collation.


------------------------------------------------------------------------
(Submissions to scc at accu.org by August 1st)

Further to articles introducing D, I am attempting to use the
event-driven Vibe.d server library, which I understand to be like a
native version of Python's Tornado and potentially a “killer app” of D
as I haven't seen any other mature event-driven server library in a
compiled language.

I would like to build a back-end server that performs some processing on
the body of the HTTP request it receives.  To begin with, I would like
it to simply echo the request body back to the client.

My code works but there are three problems: (1) when I issue a POST
request with lynx, 3 spaces are added to the start of the response text,
(2) I cannot test with nc because it just says 404 and doesn't log
anything, and (3) I'm worried that reading and writing just one byte at
a time is inefficient, but I can't see how else to do it: I raised a
"more documentation needed" bug at
https://github.com/vibe-d/vibe.d/issues/2139 but at the time of writing
nobody has replied (should I have used a different forum?)

--- code ---
import vibe.d;
void main() {
    auto settings = new HTTPServerSettings;
    settings.port = 8080;
    listenHTTP(settings, (req, res) {
        ubyte[1] s;
        while(!req.bodyReader.empty()) {
          req.bodyReader.read(s);
          res.bodyWriter.write(s);
        }
      });
    runApplication();
}


-- 
Russel.
===========================================
Dr Russel Winder      t: +44 20 7585 2200
41 Buckmaster Road    m: +44 7770 465 077
London SW11 1EN, UK   w: www.russel.org.uk
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: This is a digitally signed message part
URL: <http://lists.puremagic.com/pipermail/digitalmars-d/attachments/20180619/71448bfd/attachment.sig>