Everything about Perl .
If you want to debug your Perl output you could use a Perl constant and toggle your debug output.
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use constant { DEBUG => 1 }; DEBUG and print "debug on".$/; |
you should take a look at Benchmark Debug Perl, Perl caller Debug Function or Perl simple Data Dumper for References.
if you want to check whats the fastest way to replace a string in Perl you could use the Benchmark-Module.I compared 4 different ways :
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#!/usr/bin/perl use strict; use warnings; use Benchmark qw(:all) ; use Inline 'C'; my $teststring; #check result : $teststring = "teststring1"; $teststring =~ s/1/2/g; print $teststring.$/; $teststring = "teststring1"; $teststring =~ s/1/2/go; print $teststring.$/; $teststring = "teststring1"; $teststring =~ tr/1/2/; print $teststring.$/; $teststring = "teststring1"; $teststring = replace($teststring,"1","2"); print $teststring.$/; $teststring = "teststring1"; $teststring = repl_str($teststring,"1","2"); print $teststring.$/; #test one cmpthese(-4, { 'regex_normal' => sub {$teststring = "teststring1"; $teststring =~ s/1/2/g; }, 'regex_optimised' => sub {$teststring = "teststring1"; $teststring =~ s/1/2/go; }, 'translate' => sub {$teststring = "teststring1"; $teststring =~ tr/1/2/; }, 'perl_sub' => sub {$teststring = "teststring1"; $teststring = replace($teststring,"1","2"); }, 'C_replace_string' => sub {$teststring = "teststring1"; $teststring = repl_str($teststring,"1","2"); }, }); #test two cmpthese(-4, { 'regex_normal' => sub {$teststring = "teststring1stringxstring"; $teststring =~ s/string/test/g; }, 'regex_optimised' => sub {$teststring = "teststring1stringxstring"; $teststring =~ s/string/test/go; }, 'translate' => sub {$teststring = "teststring1stringxstring"; $teststring =~ tr/string/test/; }, 'perl_sub' => sub {$teststring = "teststring1stringxstring"; $teststring = replace($teststring,"string","test"); }, 'C_replace_string' => sub {$teststring = "teststring1stringxstring"; $teststring = repl_str($teststring,"string","test"); }, }); sub replace { my $string = shift; my $old = shift; my $new = shift; my $pos = index($string, $old); while ( $pos > -1 ) { substr( $string, $pos, length( $old ), $new ); $pos = index( $string, $old, $pos + length( $new )); } return($string); } __END__ __C__ char* repl_str(const char *str, const char *old, const char *new){ char *ret, *r; const char *p, *q; size_t oldlen = strlen(old); size_t count, retlen, newlen = strlen(new); if (oldlen != newlen) { for (count = 0, p = str; (q = strstr(p, old)) != NULL; p = q + oldlen) count++; retlen = p - str + strlen(p) + count * (newlen - oldlen); } else retlen = strlen(str); if ((ret = malloc(retlen + 1)) == NULL) return NULL; for (r = ret, p = str; (q = strstr(p, old)) != NULL; p = q + oldlen) { ptrdiff_t l = q - p; memcpy(r, p, l); r += l; memcpy(r, new, newlen); r += newlen; } strcpy(r, p); return ret; } |
the result looks like:
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teststring2 teststring2 teststring2 teststring2 teststring2 Rate perl_sub C_replace_string regex_normal regex_optimised translate perl_sub 632214/s -- -68% -68% -70% -91% C_replace_string 1961177/s 210% -- -2% -8% -71% regex_normal 1999403/s 216% 2% -- -7% -71% regex_optimised 2142180/s 239% 9% 7% -- -69% translate 6843359/s 982% 249% 242% 219% -- Rate perl_sub regex_normal regex_optimised C_replace_string translate perl_sub 430150/s -- -50% -50% -57% -92% regex_normal 861549/s 100% -- -0% -14% -85% regex_optimised 862213/s 100% 0% -- -14% -85% C_replace_string 998062/s 132% 16% 16% -- -82% translate 5603343/s 1203% 550% 550% 461% -- |
Always check you sub results (Line 1-5) and make more test cases,
at the first case (Line 6) we see that for single character the best solution is to use regex.If you want to replace a longer string better use a C function.But in both cases its better to use the /o flag for regex to optimize, but then you cant interpolate a string in to the regex.And if you only want to replaxe use tr its the fastest.
This script is a brute force Perl-Script for sha256 password with a length of 4.You can edit the characters and the length.
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#!/usr/bin/perlp use strict; use warnings; use Digest::SHA qw(sha256_hex); °define 'GET_SHA256' 'sha256_hex($cach)' # charactter array my @list = qw(a b c d e f g h i j k l m n o p q r s t u v w x y z); #search hash my $searchhash="f0c929a9e723bc62724e30c7e396e576019dfcb8cfd0a3f264ee5d72e64e49d1"; my $cach; my $res; #1 dimension for my $L1 (@list){ $cach = $L1; $res = GET_SHA256;$res =~ s/n//o;check($res,$cach); } #2 dimension for my $L1 (@list){ for my $L2 (@list){ $cach = $L1.$L2; $res = GET_SHA256;$res =~ s/n//o;check($res,$cach); } } #3 dimension for my $L1 (@list){ for my $L2 (@list){ for my $L3 (@list){ $cach = $L1.$L2.$L3; $res = GET_SHA256;$res =~ s/n//o;check($res,$cach); } } } #4 dimension for my $L1 (@list){ for my $L2 (@list){ for my $L3 (@list){ for my $L4 (@list){ $cach = $L1.$L2.$L3.$L4; $res = GET_SHA256;$res =~ s/n//o;check($res,$cach); } } } } exit(0); sub check{ if(shift eq $searchhash){ print $/.$/.$searchhash."->".shift.$/; exit(1); }else{ #debug print #print $searchhash."->".shift.$/; } } |
Result looks like this :
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f0c929a9e723bc62724e30c7e396e576019dfcb8cfd0a3f264ee5d72e64e49d1->perl real 0m2.111s user 0m2.096s sys 0m0.011s |
Don’t try to use this :
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`echo -n "$cach" | sha256sum | cut -d " " -f1` |
its much slower …..
I want to modify Perl for 3 things.
For this three things I wrote this script :
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#!/usr/bin/perl use Getopt::Long; use Inline 'C'; #option vars my $o_print,$o_help,$o_file; #vars my $data,$search0,$search1,$search2,$replace; #get options GetOptions( "p" => $o_print, "h" => $o_help, "f" => $o_file ); #print help if($o_help){ print "Perl++ Interpreter V0.01".$/; print "-p print Perl++ converted to Perl".$/; print "-f print Perl++ file".$/; print "-h print help".$/; exit; } #print file if($o_file){print $ARGV[0].$/;exit;} #load file open (FILE, $ARGV[0]) or die $!; while(<FILE>){ $data = $data.$_; } close (FILE); #define special vars my $vars = q# °define @°free_ram°@ @`free | awk "NR == 2" | awk '{print $4}'`@ °define @°load_1°@ @`uptime | awk '{print $10}' | cut -d "," -f 1,2 | tr "," "."`@ °define @°load_5°@ @`uptime | awk '{print $11}' | cut -d "," -f 1,2 | tr "," "."`@ °define @°load_15°@ @`uptime | awk '{print $12}' | cut -d "," -f 1,2 | tr "," "."`@ #; #run preprocessor for user defined vars prep(); #add them to data $data =$vars.$data; #run preprocessor for default defined vars prep(); #prepare if|for|while without brackets while($data =~ /(.{2,})((.+))([ nr]{0,}[^;{]+;)/om){ $search0 = $1; $search1 = $2; $search2 = $3; $data = repl_str($data,"$search0($search1)$search2","$search0($search1){$search2}"); } #remove leading n $data =~ s/^n//o; #print or run if($o_print){ print $data.$/; }else{ eval $data; warn $@ if $@; } sub prep { while($data =~ /^°define (.)(.+)n/om){ $search0 = $1.$2; (undef,$search1,undef,$search2) = split(/$1/, $search0); $data = repl_str($data,"°define $search0n",""); $data = repl_str($data,$search1,$search2); } } __END__ __C__ char* repl_str(const char *str, const char *old, const char *new){ char *ret, *r; const char *p, *q; size_t oldlen = strlen(old); size_t count, retlen, newlen = strlen(new); if (oldlen != newlen) { for (count = 0, p = str; (q = strstr(p, old)) != NULL; p = q + oldlen) count++; retlen = p - str + strlen(p) + count * (newlen - oldlen); } else retlen = strlen(str); if ((ret = malloc(retlen + 1)) == NULL) return NULL; for (r = ret, p = str; (q = strstr(p, old)) != NULL; p = q + oldlen) { ptrdiff_t l = q - p; memcpy(r, p, l); r += l; memcpy(r, new, newlen); r += newlen; } strcpy(r, p); return ret; } |
if you want to test it you have to save it at “/usr/bin/perlp”.
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#!/usr/bin/perlp use strict; use warnings; °define '1' '5' °define "2" "6" °define /3/ /7/ °define '4' '8' print °free_ram°.$/; if(1) print "true".$/; for(1..10)print $_.$/; print "1".$/; print "2".$/; print "3".$/; print "4".$/; |
In line 4-7 I define some values for replace.
Line 10 you cant print the current free ram, for this the script replace the token via bash script Free Ram or Load Average .
Line 13 and 16 you see that you can use if without brackets.
Line 18-21 it prints the changed values.
I use this Perl-Function to create a Thumbnail Gif and a Preview JPEG for my videos.If you want to switch the image with mouse over in HTML see this script.
I use the standard variable $$Â (Prozess-ID)Â to create a own folder for each process then convert, optimize and then delete.
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sub makegif { my $in = shift; system("rm -rf ./Folder/gif_$$"); system("mkdir ./Folder/gif_$$"); `ffmpegthumbnailer -i './Folder/$in.mp4' -q 10 -s 512 -t 5% -o './Folder/$in.jpg'`; `ffmpegthumbnailer -i './Folder/$in.mp4' -q 10 -s 512 -t 5% -o ./Folder/gif_$$/test0.jpg`; `ffmpegthumbnailer -i './Folder/$in.mp4' -q 10 -s 512 -t 10% -o ./Folder/gif_$$/test1.jpg`; `ffmpegthumbnailer -i './Folder/$in.mp4' -q 10 -s 512 -t 20% -o ./Folder/gif_$$/test2.jpg`; `ffmpegthumbnailer -i './Folder/$in.mp4' -q 10 -s 512 -t 30% -o ./Folder/gif_$$/test3.jpg`; `ffmpegthumbnailer -i './Folder/$in.mp4' -q 10 -s 512 -t 40% -o ./Folder/gif_$$/test4.jpg`; `ffmpegthumbnailer -i './Folder/$in.mp4' -q 10 -s 512 -t 50% -o ./Folder/gif_$$/test5.jpg`; `ffmpegthumbnailer -i './Folder/$in.mp4' -q 10 -s 512 -t 60% -o ./Folder/gif_$$/test6.jpg`; `ffmpegthumbnailer -i './Folder/$in.mp4' -q 10 -s 512 -t 70% -o ./Folder/gif_$$/test7.jpg`; `ffmpegthumbnailer -i './Folder/$in.mp4' -q 10 -s 512 -t 80% -o ./Folder/gif_$$/test8.jpg`; `ffmpegthumbnailer -i './Folder/$in.mp4' -q 10 -s 512 -t 90% -o ./Folder/gif_$$/test9.jpg`; `ffmpegthumbnailer -i './Folder/$in.mp4' -q 10 -s 512 -t 95% -o ./Folder/gif_$$/test10.jpg`; system("convert -layers Optimize -delay 40 -loop 0 './Folder/gif_$$/*.jpg' './Folder/".$in.".gif'"); system('mogrify -resize 166x125 "./Folder/'.$in.'.gif"'); system('mogrify -resize 166x125 "./Folder/'.$in.'.jpg"'); system("rm -rf ./Folder/gif_$$"); } |
I think everyone has the problem to make a sitemap if you have more than 1M videos …this script counts the packets (40k) in line 19 and then make the packets to generate a sitemap.
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#!/usr/bin/perl use strict; use warnings; use DBI; # MYSQL CONFIG VARIABLES my $host = "127.0.0.1"; my $database = "db"; my $tablename = "table"; my $user = "root"; my $pw = "pwd1234"; my $dbh = DBI->connect('DBI:mysql:'.$database , $user, $pw ) || die "Could not connect to database: $DBI::errstr"; my $sitemap_counter = 0; my $th = $dbh->prepare('SELECT round(count(*)/40000+0.5) FROM `video` WHERE `bw` <=80'); $th->execute(); while (my @row = $th->fetchrow_array()) { $sitemap_counter = $row[0]; } for my $SMP (0..$sitemap_counter){ print "build midd".$SMP.".xml ...".$/; open (DATEI, "> /var/www/MAP/midd".$SMP.".xml") or die $!; print DATEI '<?xml version="1.0" encoding="UTF-8"?>'.$/; print DATEI '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">'.$/; $th = $dbh->prepare('SELECT CONCAT( "<url><loc>http://www.example.com/view.php?ID=", `id` , "</loc><priority>0.8</priority></url>" ) FROM `video` WHERE `bw` <=80 ORDER BY `id` LIMIT '.(40000*$SMP).' , 40000;'); $th->execute(); while (my @row = $th->fetchrow_array()) { print DATEI $row[0].$/; } print DATEI '</urlset>'; close (DATEI); print "[DONE]".$/; } $dbh->disconnect; exit; |
If you want to Upload files via Perl and FTP. you could use this script:
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#!/usr/bin/perl use File::Basename; use Net::FTP; $ordner =time(); my $directory = "backupordnerpfad"; my @parts = split(/\/, $directory); my $length = $parts; my $ordnerDir = $parts[$length-1]; $ftp = Net::FTP->new("www.myftpserver.at", Debug => 1) or die "Cannot connect to hostname: $@"; $ftp->login("username", "passwort") or die "Cannot login ", $ftp->message; $ftp->cwd("/www") or die "Cannot change working directory ", $ftp->message; $ftp->mkdir($ordner); $ftp->cwd($ordner); # set binary mode which is needed for image upload $ftp->binary(); opendir(DIR,$directory); my @files = readdir(DIR); foreach my $file (@files) { if (not -d $file) { $ftp->put("$directory/$file"); } } $ftp->quit(); sleep(1000); |
the main script gets triggered from the WATCHDOG.pl script and is able to use the keywords on the page.
Line 6 start the phantom js
Line 11 Keywords
Line 15 Main Page crawl
Line 22 Keyword crawl
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#!/usr/bin/perl use strict; use warnings; $|=0; system('./phantomjs-1.9.7-linux-x86_64/bin/phantomjs --webdriver='.$ARGV[0].' >> /dev/null 2>&1 &');sleep(4); print 'working '.$$.(time()-$^T).$/; my @words = ("keyword1","keyword2"); my $run =""; for(1..6){ $run ="./download.pl 'http://www.example.com/new/$_' '$ARGV[0]'"; print $run.$/; system($run." && sleep 1");sleep(10); } for (0..$#words){ my $word = $words[$_]; for(1..1){ $run ="./download.pl 'http://www.example.com/search.php?what=".$word."&page=$_' '$ARGV[0]'"; print $run.$/; system($run." && sleep 1");sleep(10); } } system("ps -e -o pid,args -dd | egrep '--webdriver=$ARGV[0]' | grep -v egrep | awk '{print $1}' | xargs kill -s 9"); print "normal exit !".$/; |
This is my Watchdog script to regulate the crawling scripts …..
Line 5-6 is to reset the scripts
Line 8 is to start the selenium server
Line 11 is my proxy port pointer … i user several ports ant to set the port I let the pointer iterate ….
Line 13-12 i count the phantomjs and main.pl
Line 15-16 is to remove the line break ….
Line 18-21 check the maximum values the start the script and let the pointer iterate ….
then sleep and redo the work ….
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#!/usr/bin/perl use strict; use warnings; `killall phantomjs`; `killall main.pl`; system('java -jar ./selenium-server-standalone-2.40.0.jar >> /dev/null 2>&1 &'); #`killall -s 9 phantomjs && sleep 1`; #system('./phantomjs-1.9.7-linux-x86_64/bin/phantomjs --webdriver=8888 >> /dev/$ my $pp=10; do{ my $count = `ps aux | grep phantomjs | grep -v grep | wc -l`//0; my $skript = `ps aux | grep main.pl | grep -v grep | wc -l`//0; $count =~ s/n//og; $skript =~ s/n//og; print "Main : $count - Gesamt :$skript".$/; if($count < 4 && $skript < 4){ system("./main.pl '88$pp' > /dev/null 2>&1 &"); ++$pp;$pp =10 if($pp>=20); } sleep(20); }while(1); |