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 : \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(! $ ||$ == "");
 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/);
   my $mins = int($t%/);
   my $secs = int($t%%);
   return "$hrs:$mins:$secs";
 }

 &logWrapper($log_root,$REPORTLOG,"testFun");
 &logWrapper($log_root,$REPORTLOG,"testFun2","arg1","arg2");

print "thanks\n";

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;