• cy (14/14) Feb 05 2016 Let's say I have a socket, and a file, and I want to send the
• Jakob Ovrum (6/21) Feb 06 2016 There are some third party libraries that implement streams [1],
• cy (3/4) Feb 06 2016 Ohh, cool so the streaming...ish logic is in std.stdio now. I
• landaire (6/8) Feb 16 2016 This was actually something that kind of killed my vibe when I

cy <dlang verge.info.tm> writes:

Let's say I have a socket, and a file, and I want to send the 
contents of that file to the socket. What's the best way to do 
that? Yes I'm aware that in Linux, you can use a combination of a 
pipe and splice(2) to keep all buffers kernel side for that, but 
I was thinking more generally. The traditional C way is to read() 
into a buffer, then write() it out, until the input is exhausted. 
But apparantly in D we're not supposed to do that?

It's just that I tried to use std.stream, and found that the 
whole module had been marked as deprecated some time last year. 
What exactly is going to replace it? Some sort of lazy file 
contents accessor, that can take advantage of zero copy things 
like splice() when hooked together? A source/sink paradigm maybe?

I don't see anything analagous to what std.stream does in 
phobos... has it just not been made public yet?

Jakob Ovrum <jakobovrum gmail.com> writes:

On Saturday, 6 February 2016 at 06:29:56 UTC, cy wrote:
 Let's say I have a socket, and a file, and I want to send the 
 contents of that file to the socket. What's the best way to do 
 that? Yes I'm aware that in Linux, you can use a combination of 
 a pipe and splice(2) to keep all buffers kernel side for that, 
 but I was thinking more generally. The traditional C way is to 
 read() into a buffer, then write() it out, until the input is 
 exhausted. But apparantly in D we're not supposed to do that?

 It's just that I tried to use std.stream, and found that the 
 whole module had been marked as deprecated some time last year. 
 What exactly is going to replace it? Some sort of lazy file 
 contents accessor, that can take advantage of zero copy things 
 like splice() when hooked together? A source/sink paradigm 
 maybe?

 I don't see anything analagous to what std.stream does in 
 phobos... has it just not been made public yet?

There are some third party libraries that implement streams [1], 
but your example can be done like:

foreach(chunk; File("path/to/file").byChunk(16 * 1024))
     socket.write(chunk);

[1] e.g. http://code.dlang.org/packages/io

cy <dlang verge.info.tm> writes:

On Saturday, 6 February 2016 at 08:24:59 UTC, Jakob Ovrum wrote:
 foreach(chunk; File("path/to/file").byChunk(16 * 1024))

Ohh, cool so the streaming...ish logic is in std.stdio now. I 
thought that module was only for text output.

landaire <landergriffith+dlang gmail.com> writes:

On Saturday, 6 February 2016 at 06:29:56 UTC, cy wrote:
 I don't see anything analagous to what std.stream does in 
 phobos... has it just not been made public yet?

This was actually something that kind of killed my vibe when I 
was working on a project recently. I wanted to use some interface 
that allowed reading/writing that I could wrap to specify 
endianness and some other attributes but couldn't find any good 
replacement.