perl的logwrapper使用实例代码

这里为大家举二个小例子，供朋友们学习参考。

对任何的函数记录函数运行的时间。

复制代码 代码如下:

#!/usr/bin/perl

use warnings;

use strict;

no strict “refs”;

sub testLogToStd{

print “Test stdout : \n”;

open LOG,”> 2.txt”;

select LOG;

print “just a test\n”;

#recover STDOUT

select STDOUT;

print “just a test2\n”;

close LOG;

}

sub testFun{

  print “From testFun\n”;

  print STDERR “From TestFun Error\n”;

}

sub testFun2{

  my $arg1 = shift;

  my $arg2 = shift;

  print “From testFun2\n”;

  print $arg1.”\n”;

  print $arg2.”\n”;

}

my $log_root = “log” if(! $3 ||$3 == “”);

my $ret = system(“mkdir $log_root”) if(! -e $log_root);

my $report_log = “$log_root/report.log”;

open my $REPORTLOG,”>”,$report_log or die “cannot not open log file report.log\n”;

sub logwrapper{

  my $log_root = shift;

  my $REPORTLOG  = shift;

  my $fun = shift;

  my @parameters = @_;

  *old_stdout = *STDOUT;

  *old_stderr = *STDERR;

  open LOG, “>”,”$log_root/$fun.log” or die “annot open log file $fun.\n”;

  *STDOUT = *LOG;

  *STDERR = *LOG;

  my $start = time;

  my $ret = &$fun(@parameters);

  my $end = time;

  *STDOUT = *old_stdout;

  *STDERR = *old_stderr;

  close LOG;

  my $duration = $end – $start;

  print $REPORTLOG “$fun\n”;

  print $REPORTLOG “start:”.localtime($start).”\n”;

  print $REPORTLOG “end:”.localtime($end).”\n”;

  print $REPORTLOG “duration:”.formatTimeDuration($duration).”\n”;

  print $REPORTLOG “result:$ret\n”;

  print $REPORTLOG “\n”;

  print $REPORTLOG “\n”;

}

sub formatTimeDuration($){

  my $t = shift;

  my $hrs = int($t/3600);

  my $mins = int($t%3600/60);

  my $secs = int($t%3600%60);

  return “$hrs:$mins:$secs”;

}

&logWrapper($log_root,$REPORTLOG,”testFun”);

&logWrapper($log_root,$REPORTLOG,”testFun2″,”arg1″,”arg2″);

print “thanks\n”;

若需要调用外部命令，则需要如下：

复制代码 代码如下:

#!/usr/bin/perl

use strict;

use warnings;

# run external commands

# redirect stdout and stderr

sub run_cmd{

  my $cmd = shift;

  my $pid = open(PH, “$cmd 2>&1 |”);

  while (<PH>) {print $_; }

}

open(FH, “>”, “perl-test.log”);

*old_stdout = *STDOUT;

*old_stderr = *STDERR;

*STDOUT = *FH;

*STDERR = *FH;

my $ret = undef;

$ret = readpipe(“cp a b “);

$ret = system(“cp a b”);

$ret = `cp a b`;

run_cmd(“cp a b”);

print “AA”;

print STDERR “BB”;

*STDOUT = *old_stdout;

*STDERR = *old_stderr;