Using Sockets

Hello,

Today I started trying to play around with networking in Smalltalk.  I
thought I knew what I was doing, but apparently not.  I have a basic
understanding of the concepts involved with networking and working
with sockets, but have no experience programming with sockets.

Here is my session...

st> PackageLoader fileInPackage: 'Sockets'.
"Global garbage collection... done"
"Scavenging... 91% reclaimed, done"
Loading package Sockets
"Scavenging... 69% reclaimed, done"
"Scavenging... 47% reclaimed, done"
"Scavenging... 36% reclaimed, done"
returned value is PackageLoader
5991 byte codes executed
which took 0.064 seconds (0.056s user+0.008s sys)
479 primitives, percent 8.00
self returns 70, inst var returns 89, literal returns 14
124 method cache lookups since last cleanup, percent 2.07
53 method cache hits, 71 misses, 42.74 percent hits
st> s := Sockets.Socket remote: 'localhost' port: 60890.
stdin:3: Aborted
(ip 44)SocketAddress class>>#extractAddressesAfterLookup:
(ip 6)[] in SocketAddress class>>#allByName:
(ip 4)<unwind> BlockClosure>>#ensure:
(ip 48)[] in SocketAddress class>>#allByName:
(ip 4)[] in SocketAddress class>>#at:cache:
(ip 10)Dictionary>>#at:ifAbsent:
(ip 18)SocketAddress class>>#at:cache:
(ip 24)SocketAddress class>>#allByName:
(ip 16)SocketAddress class>>#byName:
(ip 10)Socket class(StreamSocket class)>>#remote:port:local:port:
(ip 18)Socket class(StreamSocket class)>>#remote:port:
(ip 10)UndefinedObject>>#executeStatements
(ip 0)<bottom>

Process gst aborted

What am I doing wrong?

Thanks,
Aidan



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On Thu, Dec 23, 2010 at 00:49, Aidan Gauland <[hidden email]> wrote:
> Hello,
>
> Today I started trying to play around with networking in Smalltalk.  I
> thought I knew what I was doing, but apparently not.  I have a basic
> understanding of the concepts involved with networking and working
> with sockets, but have no experience programming with sockets.

What platform are you on?  What version of GNU Smalltalk?

Paolo

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On Thu, Dec 23, 2010 at 09:24:13AM +0100, Paolo Bonzini wrote:
> What platform are you on?  What version of GNU Smalltalk?

Debian squeeze GNU/Linux (Linux kernel 2.6.32-3-amd64).
GNU Smalltalk version 3.1.

--Aidan

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On 12/23/2010 10:19 AM, Aidan Gauland wrote:
> On Thu, Dec 23, 2010 at 09:24:13AM +0100, Paolo Bonzini wrote:
>> What platform are you on?  What version of GNU Smalltalk?
>
> Debian squeeze GNU/Linux (Linux kernel 2.6.32-3-amd64).
> GNU Smalltalk version 3.1.

3.2 is available from sid, I suggest you use that (or you can just build
3.2.3).

Paolo

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Paolo Bonzini <bonzini <at> gnu.org> writes:
> On 12/23/2010 10:19 AM, Aidan Gauland wrote:
> > On Thu, Dec 23, 2010 at 09:24:13AM +0100, Paolo Bonzini wrote:
> >> What platform are you on?  What version of GNU Smalltalk?
> >
> > Debian squeeze GNU/Linux (Linux kernel 2.6.32-3-amd64).
> > GNU Smalltalk version 3.1.
>
> 3.2 is available from sid, I suggest you use that (or you can just build
> 3.2.3).

gnu-smalltalk-el from sid did not load properly, so I chose to build
GST 3.2.3.  My socket code no longer crashes gst.  Thank you very
much!

--Aidan



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Aidan Gauland <aidalgol <at> no8wireless.co.nz> writes:
> gnu-smalltalk-el from sid did not load properly, so I chose to build
> GST 3.2.3.  My socket code no longer crashes gst.  Thank you very
> much!

Claimed victory too soon.  It doesn't crash, but I have no idea what
I'm doing.  I think I once figured out how to create send a string
over a TCP connection in Squeak, but I hadn't a clue what I was doing.
I was just hacking Smalltalk in highschool when I was bored.  I've
done a little with sockets in C, but only going through tutorials.

Could someone please give me an example of using Sockets in Smalltalk
for client-side stuff (or better yet, put it on the wiki)?  There are
a few decent *server* examples on the wiki, but no Smalltalk client as
counterparts for them.

--Aidan

P.S. I ultimately want to write an IRC bot in Smalltalk, because I
don't much fancy the available IRC bots and the languages for which
IRC libraries are available.



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On Fri, Dec 24, 2010 at 10:24, Aidan Gauland <[hidden email]> wrote:
Sockets are just streams, you use them with normal
#nextPutAll:/#nextLine/#next:/#flush methods.

For simple examples of clients you can look at the SMTP classes in
packages/net/SMTP.st.  I'll prepare some examples in the next few
days.

Paolo

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Paolo Bonzini <bonzini <at> gnu.org> writes:
> Sockets are just streams, you use them with normal
> #nextPutAll:/#nextLine/#next:/#flush methods.

I knew that much.  It's getting the Socket setup and connected that
I'm having trouble with.

> For simple examples of clients you can look at the SMTP classes in
> packages/net/SMTP.st.  I'll prepare some examples in the next few
> days.

Thanks, I'd really appreciate that!  In the meantime, I'll follow your
suggestion to look at SMTP.st.

--Aidan



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Hi Aidan,

If you have a mailserver running locally, here is some simple sockets
code to access the response from it.

$ cat gst31_sockettest.st
#!/usr/bin/gst -f
        PackageLoader fileInPackage: 'NetClients'.
        s := Sockets.Socket remote: '127.0.0.1' port: 25.
        (s upTo: Character cr) printNl.
        s close.

$ gst gst31_sockettest.st
"Global garbage collection... done"
Loading package Sockets
Loading package SUnit
Loading package NetClients
'220 mailserver.ourdomain.com ESMTP Postfix'

Regards
Stephen
On 24/12/10 10:24 PM, Aidan Gauland wrote:

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