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Quests
poll ideas quest 2021
Starts at: Jan 01, 2021 at 00:00
Ends at: Dec 31, 2021 at 23:59
Current Status: Active
2 replies by pollsters
    First, read How do I create a Poll?. Then suggest your poll here. Complete ideas are more likely to be used.

    Note that links may be used in choices but not in the title.

Perl News
Pumpking resignation
on Apr 13, 2021 at 10:39
5 replies by davies

    This was discussed in the chatterbox yesterday. Analysis, with links for those who want to be even more depressed, is at https://www.theregister.com/2021/04/13/perl_dev_quits/. I wish I had the technical skills to volunteer.

    Regards,

    John Davies

    Update for thost of you suggesting tech skills aren't needed. I have never written a line of C. I have no idea what a makefile does. Spreadsheets running VBA or 123 macros are my comfort zone. And yes, I'm still comfortable with the /X versions of 123 macros.

The "A" in awk has gotten a special award
on Mar 31, 2021 at 20:04
1 reply by perlfan
Supplications
Crypt-Random-Source: 0.14 fails to install
1 direct reply — Read more / Contribute
by chandantul
on Apr 14, 2021 at 09:02

    Hello All, I am getting the following error Crypt-Random-Source: 0.14 fails to install while installing OIDC::Lite. I am in Windows 10 platform

    Please check below errors

    t/sugar.t .............. 1/? Undef did not pass type constraint "Class +Name" (in $self->{"weak_source"}) at (eval 121) line 17 "ClassName" is a subtype of "Str" "Str" is a subtype of "Value" "Value" is a subtype of "Defined" Undef did not pass type constraint "Defined" (in $self->{"weak_sou +rce"}) "Defined" is defined as: (defined($_)) # Tests were run but no plan was declared and done_testing() was not s +een. # Looks like your test exited with 255 just after 3. t/sugar.t .............. Dubious, test returned 255 (wstat 65280, 0xff +00) All 3 subtests passed Test Summary Report ------------------- t/factory.t (Wstat: 65280 Tests: 1 Failed: 0) Non-zero exit status: 255 Parse errors: No plan found in TAP output t/sugar.t (Wstat: 65280 Tests: 3 Failed: 0) Non-zero exit status: 255 Parse errors: No plan found in TAP output Files=7, Tests=17, 4 wallclock secs ( 0.11 usr + 0.09 sys = 0.20 CP +U) Result: FAIL Lockfile removed. ETHER/Crypt-Random-Source-0.14.tar.gz C:\Strawberry\perl\bin\perl.exe ./Build test -- NOT OK //hint// to see the cpan-testers results for installing this module, t +ry: reports ETHER/Crypt-Random-Source-0.14.tar.gz Stopping: 'install' failed for 'Crypt::Random::Source'. Failed during this command: ETHER/Crypt-Random-Source-0.14.tar.gz : make_test NO

    Can you please help to fix?

Should I use v5.10 because of named groups?
5 direct replies — Read more / Contribute
by hrcerq
on Apr 13, 2021 at 18:11

    Hello again.

    I've got a script that uses named capture groups to parse file records. The record format is always the same (four fields wide, colon separated), just like a passwd file (except for the number of fields).

    For example:

    0:1:bob:Bob
    1:1:bob:Bob
    1:0:alice:Alice
    

    You get the idea. At first I used to split it, but later I came to the conclusion that using a regex with named groups could provide a more understandable code. The (simplified) example below might help you get the picture.

    if (/^(?<type>[01]):(?<valid>[01]):(?<name>[^:]+):(?<comment>[^:]+)$/) + { print "Key name: ", $+{name}, "\n"; print "Key Comment: ", $+{comment}, "\n"; print "Not valid\n" unless $+{valid} || !$+{type}; } else { print "Malformed input: $_\n"; }

    Now, I've noticed (according to perlretut) that named capture groups were introduced in Perl 5.10. I don't expect the script to run in older versions, but would it be wise to use v5.10 pragma?

    Would it have any unwanted side effects? I'm not using any of the features of the bundle, just wanted to state that version 5.10 is required. Is that a good idea?

Useless use of string in return statement
7 direct replies — Read more / Contribute
by Bod
on Apr 12, 2021 at 19:06

    Is there something strange about the way return treats conditions?

    I have this and it doesn't work as expected...

    sub get_ids { my ($self, %attrs) = @_; # Do stuff... my %result; # $result{'message'} = ''; if ($self->{'error'}) { $result{'status'} = 'error'; $result{'message'} = $self->{'error'}; } else { $result{'status'} = 'success'; $result{'api-key'} = $self->{'api-public'}; $result{'session'} = $intent_id; } return encode_json(\%result) if lc($attrs{'format'}) eq 'json'; return $result{'message'} or "$result{'api-key'}:$result{'session' +}"; # <- line 229 return "SOMETHING"; }
    If it is called as get_ids( 'format' => 'json' ); it works fine but asking it to return a text string returns undef and warns Useless use of string in void context at line 229. The way I think it should work is that if $result{'message'} evaluates as true, that will get returned but if it evaluates as false then "$result{'api-key'}:$result{'session'}" wil be returned instead.

    Can you explain why this is not behaving as expected?

    As an aside, in searching for an answer I found this post -> Useless use of string in void context
    There it is suggested that Perl reports the wrong line number for this warning so it is quite possible that I'm actually looking in the wrong place!

LinkedIn module
1 direct reply — Read more / Contribute
by Bod
on Apr 12, 2021 at 08:07

    Searching CPAN I was rather surprised that the only general modules for connecting to LinkedIn seem to be WWW::LinkedIn and Net::Linkedin::OAuth2 - both of these date from before Microsoft acquired LinkedIn 5 years ago...unbelievable that it is that long ago!

    Since the 5th April, Hootsuite have reduced the number of scheduled posts permitted on free accounts down to just 5 and we don't use the other features to warrant the paid price tag. We already have an automated Twitter scheduler and I want to add LinkedIn to it so just need something to authenticate, read the timestamp of the latest post and be able to create a post containing media.

    Before I write something to do this, are there any modules available or should I try out the modules above despite their age?

Pushing hash ref onto array ref
2 direct replies — Read more / Contribute
by Bod
on Apr 11, 2021 at 18:18

    A module I am creating has a blessed hash ref as is common. One of the hashes is a reference to an array of anonymous hashes created like so:

    sub new { my $class = shift; my %attrs = @_; my @products = ({ 'id' => 0, 'name' => 'Test', 'description' => 'Some test data', 'qty' => 1, 'price' => 1000, }); $attrs{'trolley'} = \@products; return bless \%attrs, $class; }
    Later on I want to push another anonymous hash onto @products.

    What is the best way to do this?
    Both of these push lines appear to work identically in testing

    sub add_product { my ($self, $product_data) = @_; # create $new_product hasfref push $self->{'trolley'}, $new_product; push @{$self->{'trolley'}}, $new_product; }
    However, I suspect there is some subtle difference between the two which might trip me up in the future!

    Is there a practical difference and is there a 'best' option to use?

Check for another program availability
10 direct replies — Read more / Contribute
by hrcerq
on Apr 10, 2021 at 16:06

    Hi. I need feedback on this... In order to run a Perl program, I must check for the availability of another program (i.e. it's in the PATH). So I've created a subroutine for this (which returns 0 for "not found" and 1 for "found"), and I'm not sure if this is the best option. Here's the code:

    sub available { my $program = shift; for my $pathdir (split /:/, $ENV{PATH}) { return 1 if -x "$pathdir/$program"; } return 0; }

    I'd like to know if it's inefficient, and if there's a core module that already takes care of such tasks. Found nothing related on the FAQs.

DBD::mysql incorrect string value
3 direct replies — Read more / Contribute
by cormanaz
on Apr 09, 2021 at 20:02
    Hi all. I have some tweets in Russla/Ukrainian/Bulgarian in a database on another machine. I have extracted ones I want to translate using google cloud translate, which is installed on another machine. I loaded them into an array of hashes, dumped them into a Storable file, and moved that to the other machine. I am now trying to load these into a MySQL database and an getting an error I can't figure out on the other machine. Here is the code (I set the die on $sth->execute to print the error and offending values):
    use DBI; use Storable qw(retrieve); $| = 1; my $j = retrieve("/mnt/c/temp/to-translate.sto"); my $dbh = connectdb('****','****','****','****','****'); foreach my $i (0..@$j-1) { my $r; $r->{tid} = $j->[$i]->{id}; $r->{orig} = $j->[$i]->{text}; #print "$r->{tid}\t$r->{orig}\n"; insertsql($dbh,'translate',$r); } sub connectdb { # connects to mysql or PgPP my ($database,$user,$password,$driver,$server) = @_; unless ($driver) { $driver = "mysql"; } unless ($server) { $server = "hdshcresearch.asu.edu"; } my $url = "DBI:$driver:$database:$server"; unless ($user) { $user = "root"; $password = "research.HDSHC.mysql"; } my $dbh = DBI->connect( $url, $user, $password ) or die "connectdb + can't connect to mysql: $!\n"; return $dbh; } sub insertsql { my ($dbh,$table,$data,$ignore) = @_; my @qm; my @keys; my @values; my $i = -1; foreach my $k (keys %$data) { if (defined($data->{$k})) { $i++; $keys[$i] = $k; $values[$i] = $data->{$k}; $qm[$i] = '?'; } } my $keylist = join(",",@keys); my $qlist = join(",",@qm); my $sqlstatement = "insert into $table ($keylist) values ($qlist)" +; if ($ignore) { my $sqlstatement = "insert ignore into $table ($keylist) value +s ($qlist)"; } my $sth = $dbh->prepare($sqlstatement); #$sth->execute(@values) || die "putsql could not execute MySQL sta +tement: $sqlstatement $sth->errstr"; $sth->execute(@values) || die $sth->errstr. " ".join(" ",@values); $sth->finish(); return $dbh->{'mysql_insertid'}; }
    The encoding on the original db is utf8, and so are the table and columns on the target db. When it gets to one particular item it croaks:

    Incorrect string value: '\xF0\x9F\x98\x84 "...' for column 'orig' at row 1 530248086468063232 Нужно срочно брать на роботу. Цель для него есть 😄 "Рассекречена личность морпеха застрелившего бин Ладена"  at /home/steve/load-tweets.pl line 61.

    Is the problem the emoticon? If so, how can I filter these out?

Adding Filename to the end of each line
1 direct reply — Read more / Contribute
by jalopez453
on Apr 09, 2021 at 15:28

    I am trying to add the filename to the end of each line in my files. I tried a few solutions but none seem to work and this is what I have. I am not sure what I am missing or what is wrong.

    #!/usr/bin/perl -w use strict; use warnings; use Text::ParseWords; opendir IN, 'Master'; my @in = grep { /\.txt$/ } readdir IN; # read all file names form dir +except names started with dot closedir IN; for my $in (@in) { open IN, '<', "Master/$in" || next; open OUT, '>', "Update/$in" || die "can't open file Update/$in"; my @file = @in while (my $file = <IN>) { my $line = $_; $updateline = $line . $file; print OUT "$updateline"; } close OUT; close IN; }
How Xerces validation access http schemas ?
4 direct replies — Read more / Contribute
by jjmoka
on Apr 08, 2021 at 07:53
    This self contained example (pathname: /root/stef/test.pl) works fine on a server A-OK, while it doesn't work on another server B-NOK.
    use strict; use XML::Validate::Xerces; sub main { my $rsep = $/; undef $/; my $xml = <DATA>; $/ = $rsep; warn "working on this xml:[\n$xml]"; my %options; my $validator = new XML::Validate::Xerces(%options); my $valid = $validator->validate($xml) ? '' : 'in'; warn "Document is ${valid}valid\n"; } main(); __DATA__ <?xml version="1.0"?> <note xmlns="https://www.w3schools.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="https://www.w3schools.com http://www.w3schools.c +om/xml/note.xsd"> <!-- xsi:schemaLocation="https://www.w3schools.com file:///root/stef/note +.xsd"> --> <to>Tove</to> <from>Jani</from> <heading>Reminder</heading> <body>Don't forget me this weekend!</body> </note>

    If I swap with the commented out line (i.e. I change http://www.w3schools.com/xml/note.xsd to be file:///root/stef/note.xsd) so with the schema as a local file, then it works fine even in B-NOK.

    The only difference then seems when the schema is on http.

    Note that, the local file was downloaded as wget http://www.w3schools.com/xml/note.xsd so that not only I know that the content of the schema file is the same (local & remote) but also that http:80 works fine to catch stuff out there.

    I didn't do anything special to have Xerces working over http:80 for server A-OK. I would then expect to do nothing on server B-NOK to have Xerces going out there and grab the schema.

    I didn't find clear info if/how Xerces should be instructed to use http. Neither which mechanism it has built-in, to behave like wget to download URLs. I cannot understand then if I must add some config vars. The admin of server B-NOK told me that he didn't see anything attempting to reach http://www.w3schools.com apart when doing the manual wget. This does seem Xerces doesn't bother at all to get that URL.

    Really thank you in advance for any hint.

    
    ====================== SOLVED / UPDATE ================
    I wasn't given details but network settings on B-NOK server and behind have been performed and currently that fixed my issue.
    I'm left then embarrassed to come here and apologise to everyone for the time spent on this.
    To be honest I've spent ages and I didn't know what much else to try. 
    I've had the opportunity to learn from the good advices received so that's still a positive outcome for me.
    For you instead again my apologies.
    ====================== SOLVED / UPDATE ================
    
Weird perl issue, installed packages not being recognized
4 direct replies — Read more / Contribute
by kvn95ss
on Apr 08, 2021 at 02:26

    Hello, newbie here so please help me in the nightmare I'm stuck.

    I'm currently running an RHEL server which has perl installed from yum. I'm trying to install a software called Ensembl-VEP which needs certain perl packages, few of them being LWP::UserAgent,XML::DOM and BioPerl. The issue is, according to cpanm and yum, the packages have already been installed!! However, when I try to use the modules with this - perl -e "use LWP::Agent" I get this error -

    Can't locate LWP/UserAgent.pm in @INC (you may need to install the LWP +::UserAgent module) (@INC contains: /root/perl5/lib/perl5/ /usr/local +/bin/perl /usr/local/lib/perl5/site_perl/5.32.1/x86_64-linux /usr/loc +al/lib/perl5/site_perl/5.32.1 /usr/local/lib/perl5/5.32.1/x86_64-linu +x /usr/local/lib/perl5/5.32.1) at -e line 1. BEGIN failed--compilation aborted at -e line 1.

    Since I'm not the one who installed perl onto this system, nor can I contact them, what is the best possible solution to resolve this issue?

How to read serial port with WIN32:SerialPort?
3 direct replies — Read more / Contribute
by mastertone
on Apr 08, 2021 at 00:34

    I am communicating with equipment on a USB COM port using USB-RS485 serial port adapter using Win32::SerialPort A CMD message of six bytes is sent to Equipment, which responds with ACK message.

    However, I have trouble reading the ACK messsage returned from Equipment from the COM port. I have used  $PortObj->input; $PortObj->lookfor();  $PortObj->read() to retrieve the string from COM port, but it does not show up.

    Port characteristics are: Datarate = 115200 bps, 1 start bit, 8 databits, 1 stop bit, odd parity. 1 Byte = 11 bits. Each 11-bit byte has duration 11/115200 = 95.49 us. Timing is approx: 0.5msec: CMD message six bytes duration, 2 msec later ACK message, 2msec ACK message duration. 20 msec between successive CMD messages.

    Nearly any combinations of values on  $PortObj->read_interval(), $PortObj->read_char_time(), $PortObj->read_const_time() times, but it does not read the the COM port. I tried these methods and they do not read COM port, and gives in Error messages,

    : CMD 01 61 00 00 01 61 Second Read attempted before First is done at serial_io.pl line 20. Use of uninitialized value $got in numeric ne (!=) at C:/appl/strawber +ry64/perl/site/lib/Win32/SerialPort.pm line 1560. : ACK
    Also, is the command 20 millisec between port writes sleep( 0.020 ) a problem? Any advice how to read COM port? - Mastertone "Longtime Reader, First time poster"

    #!C:\appl\strawberry64\perl\bin use strict; use warnings 'all'; use Win32::SerialPort; use Time::HiRes qw (time sleep); use Data::Dumper; my $PortObj_r = &com_port_initialize() ; my @byte = (0x01, 0x61, 0x00, 0x00, 0x01, 0x61 ); my $str = ": CMD "; foreach ( @byte ) { $str .= sprintf(" %02X", $_)}; my $string_in; my $count_in; while () { my $PortObj_r = &get_PortObj; # Call Port Obj # my $PortObj = $$PortObj_r; print "$str \n"; foreach my $num ( @byte ) { $PortObj->transmit_char($num) } $string_in = $PortObj->input; # Error: Line 20 ** # # $string_in = $PortObj->lookfor(); # Error: Line 21 ** # # ($count_in, $string_in) = $PortObj->read(1); # Error: Line 22 # print ": ACK "; print $string_in; print "\n"; sleep( 0.020 ); # 20 millisec between writes undef $PortObj; } # ----------------------------------------- sub get_PortObj { $PortObj_r; } # -------------------------------------------------------- # PortObject Definiton # -------------------------------------------------------- sub com_port_initialize { my $quiet = 1; $| = 1; my $PortName = "COM10"; my $PortObj = new Win32::SerialPort ($PortName, $quiet) || die "Error: Can't open $PortName: $^E\n"; print "> PortName = ", $PortObj->alias, "\n"; my $dataRate = 115200; my $read_bufferSize = 4096; my $write_bufferSize = 4096; my $char11_t = (11/$dataRate) ; # 95.49 us = 0.095 msec my $readChar_t = 1 ; # in millisec; char11_t my $readConst_t = 2; # read_const_time my $readInterval_t = 10; my $writeCharTime = 1; my $writeConstTime = 0; $PortObj->handshake("none"); $PortObj->user_msg("ON"); $PortObj->baudrate($dataRate); $PortObj->databits(8); $PortObj->parity("odd"); $PortObj->stopbits(1); $PortObj->binary('T'); $PortObj->parity_enable('T'); $PortObj->debug(0); $PortObj->buffers($read_bufferSize, $write_bufferSize); $PortObj->read_interval($readInterval_t ); $PortObj->read_char_time($readChar_t ); $PortObj->read_const_time($readConst_t); $PortObj->write_char_time($writeCharTime); $PortObj->write_const_time($writeConstTime); $PortObj->write_settings || undef $PortObj; my $ModemStatus = $PortObj->modemlines; if ($ModemStatus & $PortObj->MS_RLSD_ON) { print "> Carrier Detect +ed"; } open OUTFILE, ">portObj.txt" or die "Error: Cannot open portObj.txt $!\n"; print OUTFILE "> PortObj = ", Dumper \\$PortObj; close OUTFILE; \$PortObj; # return reference to $PortObj }
Meditations
"Magic tools" that take the fun away
6 direct replies — Read more / Contribute
by hrcerq
on Apr 08, 2021 at 16:18

    Hi, folks.

    Recently I've found (here in PerlMonks) a link to one of Donald Knuth's great talks: Computer Programming as an Art. Knowing it was Knuth's sutff, I knew it would be worth my time.

    One of the (often overlooked) benefits of computer programming is that it can be fun. But Knuth goes beyond that stating that it should be fun and that a program should be beautiful. Fun and beauty add a lot of value to the program and to programming.

    Now, at the same time, observing the IT industry as whole, we can see how much the fun and beauty of programming are being overlooked. More and more "magic tools" are making way to sysadmin jobs, and they're focused on people who don't want to program. IT managers often see them as a means "not to depend too much on programmers". It's laughable, but I've seen it a lot.

    One example of such tools are the configuration management tools, such as Ansible, Puppet, Chef and similar tools, which take a more declarative approach to systems management. I'm not saying these tools aren't useful (or even that they are necessarily bad), but I feel like they've taken a lot of the fun away from systems management.

    This is not to mention GUI-only tools, which are mostly closed-source. Fortunately I've been far from them. But currently at my job, I help maintain some Ansible routines, and sometimes it's a daunting task. I can't remember how many times I had to grep a repository to find out when some variable was being set. If a declarative approach should be friendly, then I must say it has failed in my case, because the repository I work with has grown into a messy beast (I'm sure my co-workers agree).

    Yet, I remember once I've put a perl one-line command in a playbook and was critized precisely for this action. I was told it would bring complexity and that other people would have difficulty maintaining perl code. Can you believe it? A one-line! I'd say it's a joke if someone else told me.

    Of course, I wouldn't give up on Perl because of that. But it makes me wonder why must we always prove something that exists for decades is worthy a try, while something created a few years ago is promptly accepted. Of course, it's just my point of view, which not necessarily happens everywhere. Other points of view would be much appreciated.

PerlMonks Discussions
Display create date on Selected Best Nodes
No replies — Read more | Post response
by afoken
on Apr 10, 2021 at 07:15

    Whenever I browse Selected Best Nodes, I notice that I miss the create date that is included in "Super Search" results, "Nodes You Wrote", etc. Given that Selected Best Nodes may return postings that may be two decades old, the create date gives some context for the postings.

    So I propose to add the create date to Selected Best Nodes.

    Alexander

    --
    Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)
The Categorized Questions and Answers section has been decommissioned
1 direct reply — Read more / Contribute
by jdporter
on Apr 09, 2021 at 15:47

    Effective today, the section of PerlMonks known as "Categorized Questions and Answers" is no longer in service. The section page is a tombstone. It is no longer possible to post Categorized Questions or Answers. It is also not possible to search such posts via Super Search. It wouldn't be useful anyway, because all of the posts which were Categorized Questions have been converted into SOPW posts. Likewise, all posts which were Categorized Answers have been converted into replies to those SOPW posts. In each case, the name of the CatQA 'section' in which the Question was placed has been added to the SOPW post as a keyword.

    The intent of the CatQA section will, going forward, be fulfilled by a new system, whereby "good" questions (in SOPW) and their "best" answers will be given a special flag, as well as relevant keywords.

    Some documentation and linkage changes remain to be made. If you see any, feel free to sent a msg to SiteDocClan, pmdev, or gods, depending.

    For more information on this change, see prior discussion: RFC: Better Best Answers Gets Real

    I reckon we are the only monastery ever to have a dungeon staffed with 16,000 zombies.
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