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Re: problem with reading from socket

by rjt (Deacon)
on Dec 03, 2012 at 11:56 UTC ( #1006860=note: print w/replies, xml ) Need Help??


in reply to problem with reading from socket

You most likely have tried to use a "telnet" connection in PuTTY, which results in some control characters being sent when the connection is established. You need a raw connection. Select "Raw" instead of "Telnet" when you create the connection, or try this from a command prompt (assuming putty.exe is in your path or in the current directory):

putty -raw localhost 6699

Then it works.

Secondly, have you considered using the OO interface to sockets in Perl? In can clean up your code significantly:

#!/usr/bin/perl use strict; use warnings; use IO::Socket qw/:DEFAULT :crlf/; use FileHandle; use 5.014; my $port = 6699; my $server = IO::Socket::INET->new( Proto => 'tcp', LocalHost => 'localhost', LocalPort => $port, Listen => 1, Reuse => 1); die "Server setup failed: $!" unless $server; say "starting on port: $port..."; while (my $client = $server->accept()) { print $client "ready$CRLF"; local $/ = LF; # Be robust about accepting LF or CRLF endings on +input CLIENT: while (<$client>) { s/$CR?$LF//; # chomp CRLF or LF say "Client request: `$_'"; for ($_) { print $client "help!$CRLF" when /^help/; last CLIENT when 'quit'; } } say "Disconnected"; }

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[Corion]: Hmm. I think overnight I decided on simplifying some code. I have plugin classes that do data import (.csv, .yml, .json) and for that create objects on which then ->load() is called. But YAML::XS doesn't have an object, so I wrote my own wrapper.
[Corion]: This evening, I'll kill that wrapper again, and just call LoadFile() in the plugin class directly instead of creating a go-between object for no real gain.
[Corion]: Writing these import plugins was really nice though - in about 2 hours, I had imports for CSV, YAML and JSON, and adding XLS(X), SQLite (or DBI) data sources is also trivial. I'm idly wondering about separating the plugin into transport+parser, so ...
[Corion]: ... http:// URLs could be retrieved and then parsed, but I think that that would be overkill for a toy static site generator ;)

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