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Broke Perl Script Second pair of eyes NET::FTPSSL

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Top Forums Shell Programming and Scripting Broke Perl Script Second pair of eyes NET::FTPSSL
# 1  
Old 01-12-2009
Question Broke Perl Script Second pair of eyes NET::FTPSSL
Hi all,

Let me first start out by saying I'm a perl newbie and hope somebody can help, for the life of me I can't figure out why my script will not find and download a remote file via FTPSSL. What it's supposed to do is find the latest file named simple-test-case_("dd-MM-yyyy-hh-mm-ss").csv i.e.
Quote:
simple-test-case_09-01-2009-08-17-51.csv
and download it. But when I run it (no error or warnings) it acts like it does not find the file and hence not download it. A second pair of eyes and guidance would be much appreciated. I personally feel it's my regex.

Code:
use strict;
use warnings;
use Net::FTPSSL;
use Getopt::Long qw(:config no_ignore_case);


my $hostname = '127.0.0.1';
my $username = 'testuser';
my $password = 'testpass';
my $port = '21';
my $directory = '/';
my $verbose = '1';
my $passive = '0';
my $timeout = "30";
my $version = "0.0.2";
my $input_dir = "input";
my $output_dir = "output";
my $input_trg_file = "simple-test-case.csv";
my $input_csv_file = "simple-test-case.trg";
#Bellow var will be used later
my $output_file = "simple-test-case*.csv";
#
my $encryption = "E";

# creating connection and starting the test

my $ftps = Net::FTPSSL->new($hostname, Debug => $verbose, Port => $port, Encryption => $encryption ) or die "ERROR: Cannot conect to $hostname\n";

if (!$ftps->login("$username","$password")) { 
  print "ERROR: Sever says: ", $ftps->last_message;
  exit 2;
}
if ($input_trg_file eq "") {
  if (!$ftps->list("$directory")) { 
    print "WARNING: server says: " , $ftps->last_message;
    exit 1;
  } else {
    print $ftps->last_message;
  }
} else {
    if (!$ftps->cwd("/$input_dir")) {
      print "WARNING: server says: " , $ftps->last_message;
    exit 1;
  } else {
      if (!$ftps->put("$input_trg_file","/$input_dir/$input_trg_file")) {
        print "WARNING: server says: " , $ftps->last_message;
        exit 1;  
    } else {
      if (!$ftps->put("$input_csv_file","/$input_dir/$input_csv_file")) {
        print "WARNING: server says: " , $ftps->last_message;
        exit 1;
      } else {
        if (!$ftps->cwd("/$output_dir")) {
          print "WARNING: server says: " , $ftps->last_message;
          exit 1;
          } else {
          sleep(10);
          my @lines = grep { /^simple-test-case./i } $ftps->list();
          foreach my $name (@lines) { 
          if (!$ftps->get("$name, /tmp/$name")) {
              print "WARNING: server says: " , $ftps->last_message;
            } else {
              my @message = $ftps->last_message;
              chomp @message;
              print "OK: ", "$message[0] $message[1]\n";
              exit 0;
             }
           }
         }
       }
     }
   }
 } 

$ftps->quit;

Thanks in advance,
Eric
# 2  
Old 01-12-2009
I would always recommend running the script with the Perl debugger and step through the code line by line to see where the script is going wrong, and interrogate variables before they're used. Change line one of the script to something like
Quote:
#! /usr/bin/perl -d
or run the script as
Quote:
perl -d <script>
Quick tutorial...
Quote:
p <variable> - display a value
x <variable> - display a hash or array
n - next (will step over a subroutine)
s - step (will step into a subroutine)
R - rerun the script from the top
b <line|subroutine> - add a breakpoint
c - continue to the next breakpoint
Any valid Perl command can be entered as well
First time through, just 'n' through the program and see if it follows the path you'd expect. If not, add a breakpoint or two and rerun to the breakpoint.

You have plenty of trace code and you say you're getting no output which tends to point to the $ftps->list or grep. In debug you can enter
Quote:
x $ftps->list()
to see what that returns and if that's OK try
Quote:
x grep { /^simple-test-case./i } $ftps->list()
HTH

Jerry
# 3  
Old 01-12-2009
Hi Jerry,

Thanks for the quick reply! Smilie Well stepping through like you suggested really now backs my suspicion the the regex is borked. I put 2 test files all named the same except the extension. i.e.

simple-test-case_12-01-2009-07-27-51.csv

and

simple-test-case_12-01-2009-07-27-51.err

I should of siad in my first post instead of getting no output, I'm not seeing the output as expected, here is the step through sequence, and you can see
Code:
my @lines = grep { /^simple-test-case./i } $ftps->list();

Steps through 4 times not finding the requested file and not downloading then exiting.

Code:
  DB<2> n
>>> CWD /output
<<< 250 Directory successfully changed.
main::(connect-monitor-draft-new.pl-09:98):
98:              sleep(10);
  DB<2> n
main::(connect-monitor-draft-new.pl-09:99):
99:              my @lines = grep { /^simple-test-case./i } $ftps->list();
  DB<2> n
>>> PBSZ 0
<<< 200 PBSZ set to 0.
>>> PROT P
<<< 200 PROT now Private.
>>> PASV
<<< 227 Entering Passive Mode 
>>> LIST
<<< 150 Here comes the directory listing.
<<< 226 Directory send OK.
main::(connect-monitor-draft-new.pl-09:99):
99:              my @lines = grep { /^simple-test-case./i } $ftps->list();
  DB<2> n
main::(connect-monitor-draft-new.pl-09:99):
99:              my @lines = grep { /^simple-test-case./i } $ftps->list();
  DB<2> n
main::(connect-monitor-draft-new.pl-09:99):
99:              my @lines = grep { /^simple-test-case./i } $ftps->list();
  DB<2> n
main::(connect-monitor-draft-new.pl-09:99):
99:              my @lines = grep { /^simple-test-case./i } $ftps->list();
  DB<2> n
main::(connect-monitor-draft-new.pl-09:100):
100:              foreach my $name (@lines) { 
  DB<2> n
main::(connect-monitor-draft-new.pl-09:117):
117:    $ftps->quit;
  DB<2> n
>>> QUIT
<<< 221 Goodbye.
Debugged program terminated.  Use q to quit or R to restart,

Smilie

Cheers,
Eric
Last edited by Styles; 01-12-2009 at 08:55 PM..
# 4  
Old 01-12-2009
Your reply suggests to me that ftps->list found 4 files as line 99 was repeated 4 times.

Stop when you get to that line and enter
Quote:
x $ftps->list()
You have a '^' in the regex...is this breaking it?
Try...
Quote:
x grep { /simple/ } $ftps->list();
to see what that gives.

Just thought...Smilie - why the braces {}?
How about...
Quote:
x grep /simple/ $ftps->list();
Just play in the debugger without moving on in the script.

Jerry
# 5  
Old 01-12-2009
Hey Jerry,

Got it working, it was my regex. Funny thing is it's ab;le to download all the files, and it does place them in my tmp dir, but the server is returning a 500 error
Code:
 WARNING: server says: 550 Failed to open file.

Were is that coming from? Strange ? Also the } brackets are needed, with out them it bombs out.

Code:
 DB<1> n
>>> PBSZ 0
<<< 200 PBSZ set to 0.
>>> PROT P
<<< 200 PROT now Private.
>>> PASV
<<< 227 Entering Passive Mode 
>>> RETR -rw-rw-r--    1 25020    26089           0 Jan 13 00:27 simple-test-case_12-01-2009-07-27-51.csv
<<< 550 Failed to open file.
main::(connect-monitor-draft-new.pl-09:102):
102:	              print "WARNING: server says: " , $ftps->last_message;
  DB<1> n
main::(connect-monitor-draft-new.pl-09:101):
101:	           if (!$ftps->get($name, "/tmp/$name")) {

Cheers,
Eric
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