perl的logwrapper

来源：

http://www.cnblogs.com/itech/archive/2012/09/22/2698385.html

对任何的函数将标准输出和错误输出重定向到对应的log文件。

对任何的函数记录函数运行的时间。

代码：

#!/usr/bin/perl
use warnings;
use strict;
no strict "refs";

sub testLogToStd{
print "Test stdout : 
";
open LOG,"> 2.txt";
select LOG;
print "just a test
";
#recover STDOUT
select STDOUT;
print "just a test2
";
close LOG;
}

sub testFun{
  print "From testFun
";
  print STDERR "From TestFun Error
";
}
sub testFun2{
  my $arg1 = shift;
  my $arg2 = shift;
  print "From testFun2
";
  print $arg1."
";
  print $arg2."
";
}

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
";

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.
";
  *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
";
  print $REPORTLOG "start:".localtime($start)."
";
  print $REPORTLOG "end:".localtime($end)."
";
  print $REPORTLOG "duration:".formatTimeDuration($duration)."
";
  print $REPORTLOG "result:$ret
";
  print $REPORTLOG "
";
  print $REPORTLOG "
";
}

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 "; 

如果需要调用外部命令需要如下：

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;