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revision 1.39, Fri Feb 24 19:45:29 2006 UTC revision 1.69, Mon Oct 2 02:59:47 2006 UTC
# Line 19  Line 19 
19    
20      require Exporter;      require Exporter;
21      @ISA = ('Exporter');      @ISA = ('Exporter');
22      @EXPORT = qw(Trace T TSetup QTrace Confess Cluck Min Max Assert Open OpenDir TICK StandardSetup ScriptSetup ScriptFinish Insure);      @EXPORT = qw(Trace T TSetup QTrace Confess Cluck Min Max Assert Open OpenDir TICK StandardSetup EmergencyIP ScriptSetup ScriptFinish Insure ChDir Emergency);
23      @EXPORT_OK = qw(GetFile GetOptions Merge MergeOptions ParseCommand ParseRecord UnEscape Escape);      @EXPORT_OK = qw(GetFile GetOptions Merge MergeOptions ParseCommand ParseRecord UnEscape Escape);
24      use strict;      use strict;
25      use Carp qw(longmess croak);      use Carp qw(longmess croak);
26      use CGI;      use CGI;
27        use Cwd;
28      use FIG_Config;      use FIG_Config;
29      use PageBuilder;      use PageBuilder;
30      use Digest::MD5;      use Digest::MD5;
31      use File::Basename;      use File::Basename;
32      use File::Path;      use File::Path;
33        use File::stat;
34        use LWP::UserAgent;
35        use Time::HiRes 'gettimeofday';
36        use URI::Escape;
37    
38  =head1 Tracing and Debugging Helpers  =head1 Tracing and Debugging Helpers
39    
# Line 116  Line 121 
121    
122  =back  =back
123    
124    The format of trace messages is important because some utilities analyze trace files.
125    The time stamp is between square brackets, the module name between angle brackets,
126    a colon (C<:>), and the message text after that. If the square brackets or angle
127    brackets are missing, then the trace management utilities assume that they
128    are encountering a set of pre-formatted lines.
129    
130  =cut  =cut
131    
132  # Declare the configuration variables.  # Declare the configuration variables.
# Line 195  Line 206 
206          }          }
207          if ($target =~ m/^>[^>]/) {          if ($target =~ m/^>[^>]/) {
208              open TRACEFILE, $target;              open TRACEFILE, $target;
209              print TRACEFILE Now() . " Tracing initialized.\n";              print TRACEFILE "[" . Now() . "] <Tracer>: Tracing initialized.\n";
210              close TRACEFILE;              close TRACEFILE;
211              $Destination = ">$target";              $Destination = ">$target";
212          } else {          } else {
# Line 228  Line 239 
239      ["Sprout", "SproutLoad", "ERDB"]      ["Sprout", "SproutLoad", "ERDB"]
240    
241  This would cause trace messages in the specified three packages to appear in  This would cause trace messages in the specified three packages to appear in
242  the output. There are threer special tracing categories that are automatically  the output. There are two special tracing categories that are automatically
243  handled by this method. In other words, if you used L</TSetup> you would need  handled by this method. In other words, if you used L</TSetup> you would need
244  to include these categories manually, but if you use this method they are turned  to include these categories manually, but if you use this method they are turned
245  on automatically.  on automatically.
246    
247  =over 4  =over 4
248    
 =item FIG  
   
 Turns on trace messages inside the B<FIG> package.  
   
249  =item SQL  =item SQL
250    
251  Traces SQL commands and activity.  Traces SQL commands and activity.
# Line 275  Line 282 
282  of a keyword, the value is separated from the option name by an equal sign. You  of a keyword, the value is separated from the option name by an equal sign. You
283  can see this last in the command-line example above.  can see this last in the command-line example above.
284    
285    You can specify a different default trace level by setting C<$options->{trace}>
286    prior to calling this method.
287    
288  An example at this point would help. Consider, for example, the command-line utility  An example at this point would help. Consider, for example, the command-line utility
289  C<TransactFeatures>. It accepts a list of positional parameters plus the options  C<TransactFeatures>. It accepts a list of positional parameters plus the options
290  C<safe>, C<noAlias>, C<start>, and C<tblFiles>. To start up this command, we execute  C<safe>, C<noAlias>, C<start>, and C<tblFiles>. To start up this command, we execute
# Line 300  Line 310 
310  In this case, C<register>, C<../xacts>, and C<IDs.tbl> are the positional  In this case, C<register>, C<../xacts>, and C<IDs.tbl> are the positional
311  parameters, and would find themselves in I<@parameters> after executing the  parameters, and would find themselves in I<@parameters> after executing the
312  above code fragment. The tracing would be set to level 2, and the categories  above code fragment. The tracing would be set to level 2, and the categories
313  would be C<FIG>, C<Tracer>, and <DocUtils>. C<FIG> and C<Tracer> are standard,  would be C<Tracer>, and <DocUtils>. C<Tracer> is standard,
314  and C<DocUtils> was included because it came in within the first parameter  and C<DocUtils> was included because it came in within the first parameter
315  to this method. The I<$options> hash would be  to this method. The I<$options> hash would be
316    
# Line 314  Line 324 
324  need to be added in the future, they can be processed by this method without  need to be added in the future, they can be processed by this method without
325  upsetting the command-line utilities.  upsetting the command-line utilities.
326    
327    If the C<background> option is specified on the command line, then the
328    standard and error outputs will be directed to files in the temporary
329    directory, using the same suffix as the trace file. So, if the command
330    line specified
331    
332        -user=Bruce -background
333    
334    then the trace output would go to C<traceBruce.log>, the standard output to
335    C<outBruce.log>, and the error output to C<errBruce.log>. This is designed to
336    simplify starting a command in the background.
337    
338  Finally, if the special option C<-h> is specified, the option names will  Finally, if the special option C<-h> is specified, the option names will
339  be traced at level 0 and the program will exit without processing.  be traced at level 0 and the program will exit without processing.
340  This provides a limited help capability. For example, if the user enters  This provides a limited help capability. For example, if the user enters
# Line 330  Line 351 
351          -start    start with this genome          -start    start with this genome
352          -tblFiles output TBL files containing the corrected IDs          -tblFiles output TBL files containing the corrected IDs
353    
354    The caller has the option of modifying the tracing scheme by placing a value
355    for C<trace> in the incoming options hash. The default value can be overridden,
356    or the tracing to the standard output can be turned off by suffixing a minus
357    sign to the trace level. So, for example,
358    
359        { trace => [0, "tracing level (default 0)"],
360           ...
361    
362    would set the default trace level to 0 instead of 2, while
363    
364        { trace => ["2-", "tracing level (default 2)"],
365           ...
366    
367    would leave the default at 2, but trace only to the log file, not to the
368    standard output.
369    
370  The parameters to this method are as follows.  The parameters to this method are as follows.
371    
372  =over 4  =over 4
# Line 347  Line 384 
384  by specifying the options as command-line switches prefixed by a hyphen.  by specifying the options as command-line switches prefixed by a hyphen.
385  Tracing-related options may be added to this hash. If the C<-h> option is  Tracing-related options may be added to this hash. If the C<-h> option is
386  specified on the command line, the option descriptions will be used to  specified on the command line, the option descriptions will be used to
387  explain the options.  explain the options. To turn off tracing to the standard output, add a
388    minus sign to the value for C<trace> (see above).
389    
390  =item parmHelp  =item parmHelp
391    
392  A string that vaguely describes the positional parameters. This is used  A string that vaguely describes the positional parameters. This is used
393  if the user specifies the C<-h> option.  if the user specifies the C<-h> option.
394    
395  =item ARGV  =item argv
396    
397  List of command line parameters, including the option switches, which must  List of command line parameters, including the option switches, which must
398  precede the positional parameters and be prefixed by a hyphen.  precede the positional parameters and be prefixed by a hyphen.
# Line 374  Line 412 
412      # Get the parameters.      # Get the parameters.
413      my ($categories, $options, $parmHelp, @argv) = @_;      my ($categories, $options, $parmHelp, @argv) = @_;
414      # Add the tracing options.      # Add the tracing options.
415        if (! exists $options->{trace}) {
416      $options->{trace} = [2, "tracing level"];      $options->{trace} = [2, "tracing level"];
417        }
418      $options->{sql} = [0, "turn on SQL tracing"];      $options->{sql} = [0, "turn on SQL tracing"];
419      $options->{h} = [0, "display command-line options"];      $options->{h} = [0, "display command-line options"];
420      $options->{user} = [$$, "trace log file name suffix"];      $options->{user} = [$$, "trace log file name suffix"];
421        $options->{background} = [0, "spool standard and error output"];
422      # Create a parsing hash from the options hash. The parsing hash      # Create a parsing hash from the options hash. The parsing hash
423      # contains the default values rather than the default value      # contains the default values rather than the default value
424      # and the description. While we're at it, we'll memorize the      # and the description. While we're at it, we'll memorize the
# Line 392  Line 433 
433      }      }
434      # Parse the command line.      # Parse the command line.
435      my ($retOptions, @retParameters) = ParseCommand(\%parseOptions, @argv);      my ($retOptions, @retParameters) = ParseCommand(\%parseOptions, @argv);
436        # Get the logfile suffix.
437        my $suffix = $retOptions->{user};
438        # Check for background mode.
439        if ($retOptions->{background}) {
440            my $outFileName = "$FIG_Config::temp/out$suffix.log";
441            my $errFileName = "$FIG_Config::temp/err$suffix.log";
442            open STDOUT, ">$outFileName";
443            open STDERR, ">$errFileName";
444        }
445      # Now we want to set up tracing. First, we need to know if SQL is to      # Now we want to set up tracing. First, we need to know if SQL is to
446      # be traced.      # be traced.
447      my @cats = @{$categories};      my @cats = @{$categories};
# Line 399  Line 449 
449          push @cats, "SQL";          push @cats, "SQL";
450      }      }
451      # Add the default categories.      # Add the default categories.
452      push @cats, "Tracer", "FIG";      push @cats, "Tracer";
453      # Next, we create the category string by prefixing the trace level      # Next, we create the category string by joining the categories.
454      # and joining the categories.      my $cats = join(" ", @cats);
455      my $cats = join(" ", $parseOptions{trace}, @cats);      # Check to determine whether or not the caller wants to turn off tracing
456        # to the standard output.
457        my $traceLevel = $retOptions->{trace};
458        my $textOKFlag = 1;
459        if ($traceLevel =~ /^(.)-/) {
460            $traceLevel = $1;
461            $textOKFlag = 0;
462        }
463        # Now we set up the trace mode.
464        my $traceMode;
465        # Verify that we can open a file in the FIG temporary directory.
466        my $traceFileName = "$FIG_Config::temp/trace$suffix.log";
467        if (open TESTTRACE, ">$traceFileName") {
468            # Here we can trace to a file.
469            $traceMode = ">$traceFileName";
470            if ($textOKFlag) {
471                # Echo to standard output if the text-OK flag is set.
472                $traceMode = "+$traceMode";
473            }
474            # Close the test file.
475            close TESTTRACE;
476        } else {
477            # Here we can't trace to a file. We trace to the standard output if it's
478            # okay, and the error log otherwise.
479            if ($textOKFlag) {
480                $traceMode = "TEXT";
481            } else {
482                $traceMode = "WARN";
483            }
484        }
485      # Now set up the tracing.      # Now set up the tracing.
486      my $suffix = $retOptions->{user};      TSetup("$traceLevel $cats", $traceMode);
     TSetup($cats, "+>$FIG_Config::temp/trace$suffix.log");  
487      # Check for the "h" option. If it is specified, dump the command-line      # Check for the "h" option. If it is specified, dump the command-line
488      # options and exit the program.      # options and exit the program.
489      if ($retOptions->{h}) {      if ($retOptions->{h}) {
490          $0 =~ m#[/\\](\w+)(\.pl)?$#i;          $0 =~ m#[/\\](\w+)(\.pl)?$#i;
491          Trace("$1 [options] $parmHelp") if T(0);          print "$1 [options] $parmHelp\n";
492          for my $key (sort keys %{$options}) {          for my $key (sort keys %{$options}) {
493              my $name = Pad($key, $longestName, 0, ' ');              my $name = Pad($key, $longestName, 0, ' ');
494              my $desc = $options->{$key}->[1];              my $desc = $options->{$key}->[1];
495              if ($options->{$key}->[0]) {              if ($options->{$key}->[0]) {
496                  $desc .= " (default " . $options->{$key}->[0] . ")";                  $desc .= " (default " . $options->{$key}->[0] . ")";
497              }              }
498              Trace("  $name $desc") if T(0);              print "  $name $desc\n";
499          }          }
500          exit(0);          exit(0);
501      }      }
# Line 893  Line 971 
971      # Get the timestamp.      # Get the timestamp.
972      my $timeStamp = Now();      my $timeStamp = Now();
973      # Format the message. Note we strip off any line terminators at the end.      # Format the message. Note we strip off any line terminators at the end.
974      my $formatted = "$timeStamp <$LastCategory>: " . Strip($message);      my $formatted = "[$timeStamp] <$LastCategory>: " . Strip($message);
975      # Process according to the destination.      # Process according to the destination.
976      if ($Destination eq "TEXT") {      if ($Destination eq "TEXT") {
977          # Write the message to the standard output.          # Write the message to the standard output.
# Line 1275  Line 1353 
1353      return @inputList;      return @inputList;
1354  }  }
1355    
1356    =head3 Percent
1357    
1358    C<< my $percent = Tracer::Percent($number, $base); >>
1359    
1360    Returns the percent of the base represented by the given number. If the base
1361    is zero, returns zero.
1362    
1363    =over 4
1364    
1365    =item number
1366    
1367    Percent numerator.
1368    
1369    =item base
1370    
1371    Percent base.
1372    
1373    =item RETURN
1374    
1375    Returns the percentage of the base represented by the numerator.
1376    
1377    =back
1378    
1379    =cut
1380    
1381    sub Percent {
1382        # Get the parameters.
1383        my ($number, $base) = @_;
1384        # Declare the return variable.
1385        my $retVal = 0;
1386        # Compute the percent.
1387        if ($base != 0) {
1388            $retVal = $number * 100 / $base;
1389        }
1390        # Return the result.
1391        return $retVal;
1392    }
1393    
1394  =head3 GetFile  =head3 GetFile
1395    
1396  C<< my @fileContents = Tracer::GetFile($fileName); >>  C<< my @fileContents = Tracer::GetFile($fileName); >>
# Line 1308  Line 1424 
1424      # Declare the return variable.      # Declare the return variable.
1425      my @retVal = ();      my @retVal = ();
1426      # Open the file for input.      # Open the file for input.
1427      my $ok = open INPUTFILE, "<$fileName";      my $handle = Open(undef, "<$fileName");
     if (!$ok) {  
         # If we had an error, trace it. We will automatically return a null value.  
         Trace("Could not open \"$fileName\" for input: $!") if T(0);  
     } else {  
1428          # Read the whole file into the return variable, stripping off any terminator          # Read the whole file into the return variable, stripping off any terminator
1429          # characters.          # characters.
1430          my $lineCount = 0;          my $lineCount = 0;
1431          while (my $line = <INPUTFILE>) {      while (my $line = <$handle>) {
1432              $lineCount++;              $lineCount++;
1433              $line = Strip($line);              $line = Strip($line);
1434              push @retVal, $line;              push @retVal, $line;
1435          }          }
1436          # Close it.          # Close it.
1437          close INPUTFILE;      close $handle;
1438          my $actualLines = @retVal;          my $actualLines = @retVal;
     }  
1439      # Return the file's contents in the desired format.      # Return the file's contents in the desired format.
1440      if (wantarray) {      if (wantarray) {
1441          return @retVal;          return @retVal;
# Line 1333  Line 1444 
1444      }      }
1445  }  }
1446    
1447    =head3 PutFile
1448    
1449    C<< Tracer::PutFile($fileName, \@lines); >>
1450    
1451    Write out a file from a list of lines of text.
1452    
1453    =over 4
1454    
1455    =item fileName
1456    
1457    Name of the output file.
1458    
1459    =item lines
1460    
1461    Reference to a list of text lines. The lines will be written to the file in order, with trailing
1462    new-line characters. Alternatively, may be a string, in which case the string will be written without
1463    modification.
1464    
1465    =back
1466    
1467    =cut
1468    
1469    sub PutFile {
1470        # Get the parameters.
1471        my ($fileName, $lines) = @_;
1472        # Open the output file.
1473        my $handle = Open(undef, ">$fileName");
1474        if (ref $lines ne 'ARRAY') {
1475            # Here we have a scalar, so we write it raw.
1476            print $handle $lines;
1477        } else {
1478            # Write the lines one at a time.
1479            for my $line (@{$lines}) {
1480                print $handle "$line\n";
1481            }
1482        }
1483        # Close the output file.
1484        close $handle;
1485    }
1486    
1487  =head3 QTrace  =head3 QTrace
1488    
1489  C<< my $data = QTrace($format); >>  C<< my $data = QTrace($format); >>
# Line 1533  Line 1684 
1684    
1685  =head3 AddToListMap  =head3 AddToListMap
1686    
1687  C<< Tracer::AddToListMap(\%hash, $key, $value); >>  C<< Tracer::AddToListMap(\%hash, $key, $value1, $value2, ... valueN); >>
1688    
1689  Add a key-value pair to a hash of lists. If no value exists for the key, a singleton list  Add a key-value pair to a hash of lists. If no value exists for the key, a singleton list
1690  is created for the key. Otherwise, the new value is pushed onto the list.  is created for the key. Otherwise, the new value is pushed onto the list.
# Line 1548  Line 1699 
1699    
1700  Key for which the value is to be added.  Key for which the value is to be added.
1701    
1702  =item value  =item value1, value2, ... valueN
1703    
1704  Value to add to the key's value list.  List of values to add to the key's value list.
1705    
1706  =back  =back
1707    
# Line 1558  Line 1709 
1709    
1710  sub AddToListMap {  sub AddToListMap {
1711      # Get the parameters.      # Get the parameters.
1712      my ($hash, $key, $value) = @_;      my ($hash, $key, @values) = @_;
1713      # Process according to whether or not the key already has a value.      # Process according to whether or not the key already has a value.
1714      if (! exists $hash->{$key}) {      if (! exists $hash->{$key}) {
1715          $hash->{$key} = [$value];          $hash->{$key} = [@values];
1716      } else {      } else {
1717          push @{$hash->{$key}}, $value;          push @{$hash->{$key}}, @values;
1718      }      }
1719  }  }
1720    
# Line 1571  Line 1722 
1722    
1723  C<< if (Tracer::DebugMode) { ...code... } >>  C<< if (Tracer::DebugMode) { ...code... } >>
1724    
1725  Return TRUE if debug mode has been turned on, else output an error  Return TRUE if debug mode has been turned on, else abort.
 page and return FALSE.  
1726    
1727  Certain CGI scripts are too dangerous to exist in the production  Certain CGI scripts are too dangerous to exist in the production
1728  environment. This method provides a simple way to prevent them  environment. This method provides a simple way to prevent them
1729  from working unless they are explicitly turned on by creating a password  from working unless they are explicitly turned on by creating a password
1730  cookie via the B<SetPassword> script.  If debugging mode  cookie via the B<SetPassword> script.  If debugging mode
1731  is not turned on, an error web page will be output directing the  is not turned on, an error will occur.
 user to enter in the correct password.  
1732    
1733  =cut  =cut
1734    
# Line 1592  Line 1741 
1741      if ($encrypted eq "252dec43280e0c0d6a75ffcec486e61d") {      if ($encrypted eq "252dec43280e0c0d6a75ffcec486e61d") {
1742          $retVal = 1;          $retVal = 1;
1743      } else {      } else {
1744          # Here debug mode is off, so we generate an error page.          # Here debug mode is off, so we generate an error.
1745          my $pageString = PageBuilder::Build("<Html/ErrorPage.html", {}, "Html");          Confess("Cannot use this facility without logging in.");
         print $pageString;  
1746      }      }
1747      # Return the determination indicator.      # Return the determination indicator.
1748      return $retVal;      return $retVal;
# Line 1746  Line 1894 
1894    
1895  =head3 ScriptSetup  =head3 ScriptSetup
1896    
1897  C<< my ($query, $varHash) = ScriptSetup(); >>  C<< my ($cgi, $varHash) = ScriptSetup($noTrace); >>
1898    
1899  Perform standard tracing and debugging setup for scripts. The value returned is  Perform standard tracing and debugging setup for scripts. The value returned is
1900  the CGI object followed by a pre-built variable hash.  the CGI object followed by a pre-built variable hash.
1901    
1902  The C<Trace> query parameter is used to determine whether or not tracing is active and  The C<Trace> query parameter is used to determine whether or not tracing is active and
1903  which trace modules (other than C<Tracer> and C<FIG>) should be turned on. Specifying  which trace modules (other than C<Tracer> itself) should be turned on. Specifying
1904  the C<CGI> trace module will trace parameter and environment information. Parameters are  the C<CGI> trace module will trace parameter and environment information. Parameters are
1905  traced at level 3 and environment variables at level 4. At the end of the script, the  traced at level 3 and environment variables at level 4. To trace to a file instead of to
1906  client should call L</ScriptFinish> to output the web page.  the web page, set C<TF> to 1. At the end of the script, the client should call
1907    L</ScriptFinish> to output the web page.
1908    
1909    In some situations, it is not practical to invoke tracing via form parameters. For this
1910    situation, you can turn on emergency tracing by invoking the L</Emergency> method from
1911    a web page. Emergency tracing is detected via a file with the name
1912    C<Emergency>I<IPaddr>C<.txt> in the FIG temporary directory, where I<IPaddr> is the
1913    IP address of the remote user who wants tracing turned on. The file contains a time
1914    limit in hours on the first line, a tracing destination on the second line, a trace
1915    level on the third line, and the tracing modules on subsequent lines.
1916    
1917    =over 4
1918    
1919    =item noTrace (optional)
1920    
1921    If specified, tracing will be suppressed. This is useful if the script wants to set up
1922    tracing manually.
1923    
1924    =item RETURN
1925    
1926    Returns a two-element list consisting of a CGI query object and a variable hash for
1927    the output page.
1928    
1929    =back
1930    
1931  =cut  =cut
1932    
1933  sub ScriptSetup {  sub ScriptSetup {
1934        # Get the parameters.
1935        my ($noTrace) = @_;
1936      # Get the CGI query object.      # Get the CGI query object.
1937      my $query = CGI->new();      my $cgi = CGI->new();
1938      # Check for tracing. Set it up if the user asked for it.      # Set up tracing if it's not suppressed.
1939      if ($query->param('Trace')) {      CGITrace($cgi) unless $noTrace;
1940          # Set up tracing to be queued for display at the bottom of the web page.      # Create the variable hash.
1941          TSetup($query->param('Trace') . " FIG Tracer", "QUEUE");      my $varHash = { results => '' };
1942        # Return the query object and variable hash.
1943        return ($cgi, $varHash);
1944    }
1945    
1946    =head3 CGITrace
1947    
1948    C<< Tracer::CGITrace($cgi); >>
1949    
1950    Set up tracing for a CGI script. See L</ScriptSetup> for more information.
1951    
1952    =over 4
1953    
1954    =item cgi
1955    
1956    Ths CGI query object for this script.
1957    
1958    =back
1959    
1960    =cut
1961    
1962    sub CGITrace {
1963        # Get the parameters.
1964        my ($cgi) = @_;
1965        # Default to no tracing except errors.
1966        my ($tracing, $dest) = ("0", "WARN");
1967        # Check for emergency tracing.
1968        my $ip = EmergencyIP($cgi);
1969        my $emergencyFile = EmergencyFileName($ip);
1970        if (-e $emergencyFile) {
1971            # We have the file. Read in the data.
1972            my @tracing = GetFile($emergencyFile);
1973            # Pull off the time limit.
1974            my $expire = shift @tracing;
1975            # Convert it to seconds.
1976            $expire *= 3600;
1977            # Check the file data.
1978            my $stat = stat($emergencyFile);
1979            my ($now) = gettimeofday;
1980            if ($now - $stat->mtime > $expire) {
1981                # Delete the expired file.
1982                unlink $emergencyFile;
1983            } else {
1984                # Emergency tracing is on. Pull off the destination and
1985                # the trace level;
1986                $dest = shift @tracing;
1987                my $level = shift @tracing;
1988                # Convert the destination to a real tracing destination.
1989                # temp directory.
1990                $dest = EmergencyTracingDest($ip, $dest);
1991                # Insure Tracer is specified.
1992                my %moduleHash = map { $_ => 1 } @tracing;
1993                $moduleHash{Tracer} = 1;
1994                # Set the trace parameter.
1995                $tracing = join(" ", $level, sort keys %moduleHash);
1996                # Make sure the script knows tracing is on.
1997                $cgi->param(-name => 'Trace', -value => $tracing);
1998                $cgi->param(-name => 'TF', -value => (($dest =~ /^>/) ? 1 : 0));
1999            }
2000        } elsif ($cgi->param('Trace')) {
2001            # Here the user has requested tracing via a form.
2002            $dest = ($cgi->param('TF') ? ">$FIG_Config::temp/Trace$$.log" : "QUEUE");
2003            $tracing = $cgi->param('Trace') . " Tracer";
2004        }
2005        # Setup the tracing we've determined from all the stuff above.
2006        TSetup($tracing, $dest);
2007          # Trace the parameter and environment data.          # Trace the parameter and environment data.
2008        TraceParms($cgi);
2009    }
2010    
2011    =head3 EmergencyFileName
2012    
2013    C<< my $fileName = Tracer::EmergencyFileName($ip); >>
2014    
2015    Return the emergency tracing file name. This is the file that specifies
2016    the tracing information.
2017    
2018    =over 4
2019    
2020    =item ip
2021    
2022    IP address of the user who wants tracing, as taken from the C<< $cgi->remote_host() >>
2023    method.
2024    
2025    =item RETURN
2026    
2027    Returns the name of the file to contain the emergency tracing information.
2028    
2029    =back
2030    
2031    =cut
2032    
2033    sub EmergencyFileName {
2034        # Get the parameters.
2035        my ($ip) = @_;
2036        # Compute the emergency tracing file name.
2037        return "$FIG_Config::temp/Emergency$ip.txt";
2038    }
2039    
2040    =head3 EmergencyFileTarget
2041    
2042    C<< my $fileName = Tracer::EmergencyFileTarget($ip); >>
2043    
2044    Return the emergency tracing target file name. This is the file that receives
2045    the tracing output for file-based tracing.
2046    
2047    =over 4
2048    
2049    =item ip
2050    
2051    IP address of the user who wants tracing, as taken from the C<< $cgi->remote_host() >>
2052    method.
2053    
2054    =item RETURN
2055    
2056    Returns the name of the file to contain the emergency tracing information.
2057    
2058    =back
2059    
2060    =cut
2061    
2062    sub EmergencyFileTarget {
2063        # Get the parameters.
2064        my ($ip) = @_;
2065        # Compute the emergency tracing file name.
2066        return "$FIG_Config::temp/Emergency$ip.log";
2067    }
2068    
2069    =head3 EmergencyTracingDest
2070    
2071    C<< my $dest = Tracer::EmergencyTracingDest($ip, $myDest); >>
2072    
2073    This method converts an emergency tracing destination to a real
2074    tracing destination. The main difference is that if the
2075    destination is C<FILE> or C<APPEND>, we convert it to file
2076    output.
2077    
2078    =over 4
2079    
2080    =item ip
2081    
2082    IP address of the user who wants tracing, as taken from the C<< $cgi->remote_host() >>
2083    method.
2084    
2085    =item myDest
2086    
2087    Destination from the emergency tracing file.
2088    
2089    =item RETURN
2090    
2091    Returns a destination that can be passed into L</TSetup>.
2092    
2093    =back
2094    
2095    =cut
2096    
2097    sub EmergencyTracingDest {
2098        # Get the parameters.
2099        my ($ip, $myDest) = @_;
2100        # Declare the return variable.
2101        my $retVal;
2102        # Process according to the destination value.
2103        if ($myDest eq 'FILE') {
2104            $retVal = ">" . EmergencyFileTarget($ip);
2105        } elsif ($myDest eq 'APPEND') {
2106            $retVal = ">>" . EmergencyFileTarget($ip);
2107        } else {
2108            $retVal = $myDest;
2109        }
2110        # Return the result.
2111        return $retVal;
2112    }
2113    
2114    =head3 Emergency
2115    
2116    C<< Emergency($cgi, $hours, $dest, $level, @modules); >>
2117    
2118    Turn on emergency tracing. This method can only be invoked over the web and is
2119    should not be called if debug mode is off. The caller specifies the duration of the
2120    emergency in hours, the desired tracing destination, the trace level,
2121    and a list of the trace modules to activate. For the duration, when a user
2122    from the specified remote web location invokes a Sprout CGI script, tracing
2123    will be turned on automatically. See L</TSetup> for more about tracing
2124    setup and L</ScriptSetup> for more about emergency tracing.
2125    
2126    =over 4
2127    
2128    =item cgi
2129    
2130    A CGI query object.
2131    
2132    =item hours
2133    
2134    Number of hours to keep emergency tracing alive.
2135    
2136    =item dest
2137    
2138    Tracing destination. If no path information is specified for a file
2139    destination, it is put in the FIG temporary directory.
2140    
2141    =item level
2142    
2143    Tracing level. A higher level means more trace messages.
2144    
2145    =item modules
2146    
2147    A list of the tracing modules to activate.
2148    
2149    =back
2150    
2151    =cut
2152    
2153    sub Emergency {
2154        # Get the parameters.
2155        my ($cgi, $hours, $dest, $level, @modules) = @_;
2156        # Get the IP address.
2157        my $ip = EmergencyIP($cgi);
2158        # Create the emergency file.
2159        my $specFile = EmergencyFileName($ip);
2160        my $outHandle = Open(undef, ">$specFile");
2161        print $outHandle join("\n",$hours, $dest, $level, @modules, "");
2162    }
2163    
2164    =head3 EmergencyIP
2165    
2166    C<< my $ip = EmergencyIP($cgi); >>
2167    
2168    Return the IP address to be used for emergency tracing. If at smoe point we need
2169    to change the way we compute the IP address, or we decide to use something else,
2170    all we need to do is change this method.
2171    
2172    =over 4
2173    
2174    =item cgi
2175    
2176    CGI query object.
2177    
2178    =item RETURN
2179    
2180    Returns the IP address to be used for labelling emergency tracing.
2181    
2182    =back
2183    
2184    =cut
2185    
2186    sub EmergencyIP {
2187        # Get the parameters.
2188        my ($cgi) = @_;
2189        # Return the result.
2190        return $cgi->remote_addr();
2191    }
2192    
2193    
2194    =head3 TraceParms
2195    
2196    C<< Tracer::TraceParms($cgi); >>
2197    
2198    Trace the CGI parameters at trace level CGI => 3 and the environment variables
2199    at level CGI => 4.
2200    
2201    =over 4
2202    
2203    =item cgi
2204    
2205    CGI query object containing the parameters to trace.
2206    
2207    =back
2208    
2209    =cut
2210    
2211    sub TraceParms {
2212        # Get the parameters.
2213        my ($cgi) = @_;
2214          if (T(CGI => 3)) {          if (T(CGI => 3)) {
2215              # Here we want to trace the parameter data.              # Here we want to trace the parameter data.
2216              my @names = $query->param;          my @names = $cgi->param;
2217              for my $parmName (sort @names) {              for my $parmName (sort @names) {
2218                  # Note we skip "Trace", which is for our use only.              # Note we skip the Trace parameters, which are for our use only.
2219                  if ($parmName ne 'Trace') {              if ($parmName ne 'Trace' && $parmName ne 'TF') {
2220                      my @values = $query->param($parmName);                  my @values = $cgi->param($parmName);
2221                      Trace("CGI: $parmName = " . join(", ", @values));                      Trace("CGI: $parmName = " . join(", ", @values));
2222                  }                  }
2223              }              }
2224            # Display the request method.
2225            my $method = $cgi->request_method();
2226            Trace("Method: $method");
2227          }          }
2228          if (T(CGI => 4)) {          if (T(CGI => 4)) {
2229              # Here we want the environment data too.              # Here we want the environment data too.
# Line 1784  Line 2231 
2231                  Trace("ENV: $envName = $ENV{$envName}");                  Trace("ENV: $envName = $ENV{$envName}");
2232              }              }
2233          }          }
     } else {  
         # Here tracing is to be turned off. All we allow is errors traced into the  
         # error log.  
         TSetup("0", "WARN");  
     }  
     # Create the variable hash.  
     my $varHash = { DebugData => '' };  
     # If we're in DEBUG mode, set up the debug mode data for forms.  
     if (Tracer::DebugMode) {  
         $varHash->{DebugData} = GetFile("Html/DebugFragment.html");  
     }  
     # Return the query object and variable hash.  
     return ($query, $varHash);  
2234  }  }
2235    
2236  =head3 ScriptFinish  =head3 ScriptFinish
# Line 1823  Line 2257 
2257      use FIG;      use FIG;
2258      # ... more uses ...      # ... more uses ...
2259    
2260      my ($query, $varHash) = ScriptSetup();      my ($cgi, $varHash) = ScriptSetup();
2261      eval {      eval {
2262          # ... get data from $query, put it in $varHash ...          # ... get data from $cgi, put it in $varHash ...
2263      };      };
2264      if ($@) {      if ($@) {
2265          Trace("Script Error: $@") if T(0);          Trace("Script Error: $@") if T(0);
# Line 1860  Line 2294 
2294      # Check for a template file situation.      # Check for a template file situation.
2295      my $outputString;      my $outputString;
2296      if (defined $varHash) {      if (defined $varHash) {
2297          # Here we have a template file. We need to apply the variables to the template.          # Here we have a template file. We need to determine the template type.
2298          $outputString = PageBuilder::Build("<$webData", $varHash, "Html");          my $template;
2299            if ($FIG_Config::template_url && $webData =~ /\.php$/) {
2300                $template = "$FIG_Config::template_url/$webData";
2301            } else {
2302                $template = "<<$webData";
2303            }
2304            $outputString = PageBuilder::Build($template, $varHash, "Html");
2305      } else {      } else {
2306          # Here the user gave us a raw string.          # Here the user gave us a raw string.
2307          $outputString = $webData;          $outputString = $webData;
2308      }      }
2309      # Check for trace messages.      # Check for trace messages.
2310      if ($Destination eq "QUEUE") {      if ($Destination ne "NONE" && $TraceLevel > 0) {
2311          # We have trace messages, so we want to put them at the end of the body. This          # We have trace messages, so we want to put them at the end of the body. This
2312          # is either at the end of the whole string or at the beginning of the BODY          # is either at the end of the whole string or at the beginning of the BODY
2313          # end-tag.          # end-tag.
# Line 1875  Line 2315 
2315          if ($outputString =~ m#</body>#gi) {          if ($outputString =~ m#</body>#gi) {
2316              $pos = (pos $outputString) - 7;              $pos = (pos $outputString) - 7;
2317          }          }
2318          substr $outputString, $pos, 0, QTrace('Html');          # If the trace messages were queued, we unroll them. Otherwise, we display the
2319            # destination.
2320            my $traceHtml;
2321            if ($Destination eq "QUEUE") {
2322                $traceHtml = QTrace('Html');
2323            } elsif ($Destination =~ /^>>(.+)$/) {
2324                # Here the tracing output it to a file. We code it as a hyperlink so the user
2325                # can copy the file name into the clipboard easily.
2326                my $actualDest = $1;
2327                $traceHtml = "<p>Tracing output to <a href=\"$actualDest\">$actualDest</a>.</p>\n";
2328            } else {
2329                # Here we have one of the special destinations.
2330                $traceHtml = "<P>Tracing output type is $Destination.</p>\n";
2331            }
2332            substr $outputString, $pos, 0, $traceHtml;
2333      }      }
2334      # Write the output string.      # Write the output string.
2335      print $outputString;      print $outputString;
# Line 1901  Line 2355 
2355      my ($dirName) = @_;      my ($dirName) = @_;
2356      if (! -d $dirName) {      if (! -d $dirName) {
2357          Trace("Creating $dirName directory.") if T(2);          Trace("Creating $dirName directory.") if T(2);
2358          mkpath $dirName;          eval { mkpath $dirName; };
2359            if ($@) {
2360                Confess("Error creating $dirName: $@");
2361            }
2362        }
2363    }
2364    
2365    =head3 ChDir
2366    
2367    C<< ChDir($dirName); >>
2368    
2369    Change to the specified directory.
2370    
2371    =over 4
2372    
2373    =item dirName
2374    
2375    Name of the directory to which we want to change.
2376    
2377    =back
2378    
2379    =cut
2380    
2381    sub ChDir {
2382        my ($dirName) = @_;
2383        if (! -d $dirName) {
2384            Confess("Cannot change to directory $dirName: no such directory.");
2385        } else {
2386            Trace("Changing to directory $dirName.") if T(4);
2387            my $okFlag = chdir $dirName;
2388            if (! $okFlag) {
2389                Confess("Error switching to directory $dirName.");
2390            }
2391        }
2392    }
2393    
2394    =head3 SendSMS
2395    
2396    C<< my $msgID = Tracer::SendSMS($phoneNumber, $msg); >>
2397    
2398    Send a text message to a phone number using Clickatell. The FIG_Config file must contain the
2399    user name, password, and API ID for the relevant account in the hash reference variable
2400    I<$FIG_Config::phone>, using the keys C<user>, C<password>, and C<api_id>. For
2401    example, if the user name is C<BruceTheHumanPet>, the password is C<silly>, and the API ID
2402    is C<2561022>, then the FIG_Config file must contain
2403    
2404        $phone =  { user => 'BruceTheHumanPet',
2405                    password => 'silly',
2406                    api_id => '2561022' };
2407    
2408    The original purpose of this method was to insure Bruce would be notified immediately when the
2409    Sprout Load terminates. Care should be taken if you do not wish Bruce to be notified immediately
2410    when you call this method.
2411    
2412    The message ID will be returned if successful, and C<undef> if an error occurs.
2413    
2414    =over 4
2415    
2416    =item phoneNumber
2417    
2418    Phone number to receive the message, in international format. A United States phone number
2419    would be prefixed by "1". A British phone number would be prefixed by "44".
2420    
2421    =item msg
2422    
2423    Message to send to the specified phone.
2424    
2425    =item RETURN
2426    
2427    Returns the message ID if successful, and C<undef> if the message could not be sent.
2428    
2429    =back
2430    
2431    =cut
2432    
2433    sub SendSMS {
2434        # Get the parameters.
2435        my ($phoneNumber, $msg) = @_;
2436        # Declare the return variable. If we do not change it, C<undef> will be returned.
2437        my $retVal;
2438        # Only proceed if we have phone support.
2439        if (! defined $FIG_Config::phone) {
2440            Trace("Phone support not present in FIG_Config.") if T(1);
2441        } else {
2442            # Get the phone data.
2443            my $parms = $FIG_Config::phone;
2444            # Get the Clickatell URL.
2445            my $url = "http://api.clickatell.com/http/";
2446            # Create the user agent.
2447            my $ua = LWP::UserAgent->new;
2448            # Request a Clickatell session.
2449            my $resp = $ua->post("$url/sendmsg", { user => $parms->{user},
2450                                         password => $parms->{password},
2451                                         api_id => $parms->{api_id},
2452                                         to => $phoneNumber,
2453                                         text => $msg});
2454            # Check for an error.
2455            if (! $resp->is_success) {
2456                Trace("Alert failed.") if T(1);
2457            } else {
2458                # Get the message ID.
2459                my $rstring = $resp->content;
2460                if ($rstring =~ /^ID:\s+(.*)$/) {
2461                    $retVal = $1;
2462                } else {
2463                    Trace("Phone attempt failed with $rstring") if T(1);
2464                }
2465            }
2466        }
2467        # Return the result.
2468        return $retVal;
2469    }
2470    
2471    =head3 CommaFormat
2472    
2473    C<< my $formatted = Tracer::CommaFormat($number); >>
2474    
2475    Insert commas into a number.
2476    
2477    =over 4
2478    
2479    =item number
2480    
2481    A sequence of digits.
2482    
2483    =item RETURN
2484    
2485    Returns the same digits with commas strategically inserted.
2486    
2487    =back
2488    
2489    =cut
2490    
2491    sub CommaFormat {
2492        # Get the parameters.
2493        my ($number) = @_;
2494        # Pad the length up to a multiple of three.
2495        my $padded = "$number";
2496        $padded = " " . $padded while length($padded) % 3 != 0;
2497        # This is a fancy PERL trick. The parentheses in the SPLIT pattern
2498        # cause the delimiters to be included in the output stream. The
2499        # GREP removes the empty strings in between the delimiters.
2500        my $retVal = join(",", grep { $_ ne '' } split(/(...)/, $padded));
2501        # Clean out the spaces.
2502        $retVal =~ s/ //g;
2503        # Return the result.
2504        return $retVal;
2505      }      }
2506    =head3 SetPermissions
2507    
2508    C<< Tracer::SetPermissions($dirName, $group, $mask, %otherMasks); >>
2509    
2510    Set the permissions for a directory and all the files and folders inside it.
2511    In addition, the group ownership will be changed to the specified value.
2512    
2513    This method is more vulnerable than most to permission and compatability
2514    problems, so it does internal error recovery.
2515    
2516    =over 4
2517    
2518    =item dirName
2519    
2520    Name of the directory to process.
2521    
2522    =item group
2523    
2524    Name of the group to be assigned.
2525    
2526    =item mask
2527    
2528    Permission mask. Bits that are C<1> in this mask will be ORed into the
2529    permission bits of any file or directory that does not already have them
2530    set to 1.
2531    
2532    =item otherMasks
2533    
2534    Map of search patterns to permission masks. If a directory name matches
2535    one of the patterns, that directory and all its members and subdirectories
2536    will be assigned the new pattern. For example, the following would
2537    assign 01664 to most files, but would use 01777 for directories named C<tmp>.
2538    
2539        Tracer::SetPermissions($dirName, 'fig', 01664, '^tmp$' => 01777);
2540    
2541    The list is ordered, so the following would use 0777 for C<tmp1> and
2542    0666 for C<tmp>, C<tmp2>, or C<tmp3>.
2543    
2544        Tracer::SetPermissions($dirName, 'fig', 01664, '^tmp1' => 0777,
2545                                                       '^tmp' => 0666);
2546    
2547    Note that the pattern matches are all case-insensitive, and only directory
2548    names are matched, not file names.
2549    
2550    =back
2551    
2552    =cut
2553    
2554    sub SetPermissions {
2555        # Get the parameters.
2556        my ($dirName, $group, $mask, @otherMasks) = @_;
2557        # Set up for error recovery.
2558        eval {
2559            # Switch to the specified directory.
2560            ChDir($dirName);
2561            # Get the group ID.
2562            my $gid = getgrnam($group);
2563            # Get the mask for tracing.
2564            my $traceMask = sprintf("%04o", $mask) . "($mask)";
2565            Trace("Fixing permissions for directory $dirName using group $group($gid) and mask $traceMask.") if T(2);
2566            my $fixCount = 0;
2567            my $lookCount = 0;
2568            # @dirs will be a stack of directories to be processed.
2569            my @dirs = (getcwd());
2570            while (scalar(@dirs) > 0) {
2571                # Get the current directory.
2572                my $dir = pop @dirs;
2573                # Check for a match to one of the specified directory names. To do
2574                # that, we need to pull the individual part of the name off of the
2575                # whole path.
2576                my $simpleName = $dir;
2577                if ($dir =~ m!/([^/]+)$!) {
2578                    $simpleName = $1;
2579                }
2580                Trace("Simple directory name for $dir is $simpleName.") if T(4);
2581                # Search for a match.
2582                my $match = 0;
2583                my $i;
2584                for ($i = 0; $i < $#otherMasks && ! $match; $i += 2) {
2585                    my $pattern = $otherMasks[$i];
2586                    if ($simpleName =~ /$pattern/i) {
2587                        $match = 1;
2588                    }
2589                }
2590                # Check for a match. Note we use $i-1 because the loop added 2
2591                # before terminating due to the match.
2592                if ($match && $otherMasks[$i-1] != $mask) {
2593                    # This directory matches one of the incoming patterns, and it's
2594                    # a different mask, so we process it recursively with that mask.
2595                    SetPermissions($dir, $group, $otherMasks[$i-1], @otherMasks);
2596                } else {
2597                    # Here we can process normally. Get all of the non-hidden members.
2598                    my @submems = OpenDir($dir, 1);
2599                    for my $submem (@submems) {
2600                        # Get the full name.
2601                        my $thisMem = "$dir/$submem";
2602                        Trace("Checking member $thisMem.") if T(4);
2603                        $lookCount++;
2604                        if ($lookCount % 1000 == 0) {
2605                            Trace("$lookCount members examined. Current is $thisMem. Mask is $traceMask") if T(3);
2606                        }
2607                        # Fix the group.
2608                        chown -1, $gid, $thisMem;
2609                        # Insure this member is not a symlink.
2610                        if (! -l $thisMem) {
2611                            # Get its info.
2612                            my $fileInfo = stat $thisMem;
2613                            # Only proceed if we got the info. Otherwise, it's a hard link
2614                            # and we want to skip it anyway.
2615                            if ($fileInfo) {
2616                                my $fileMode = $fileInfo->mode;
2617                                if (($fileMode & $mask) != $mask) {
2618                                    # Fix this member.
2619                                    $fileMode |= $mask;
2620                                    chmod $fileMode, $thisMem;
2621                                    $fixCount++;
2622                                }
2623                                # If it's a subdirectory, stack it.
2624                                if (-d $thisMem) {
2625                                    push @dirs, $thisMem;
2626                                }
2627                            }
2628                        }
2629                    }
2630                }
2631            }
2632            Trace("$lookCount files and directories processed, $fixCount fixed.") if T(2);
2633        };
2634        # Check for an error.
2635        if ($@) {
2636            Confess("SetPermissions error: $@");
2637        }
2638    }
2639    
2640    =head3 CompareLists
2641    
2642    C<< my ($inserted, $deleted) = Tracer::CompareLists(\@newList, \@oldList, $keyIndex); >>
2643    
2644    Compare two lists of tuples, and return a hash analyzing the differences. The lists
2645    are presumed to be sorted alphabetically by the value in the $keyIndex column.
2646    The return value contains a list of items that are only in the new list
2647    (inserted) and only in the old list (deleted).
2648    
2649    =over 4
2650    
2651    =item newList
2652    
2653    Reference to a list of new tuples.
2654    
2655    =item oldList
2656    
2657    Reference to a list of old tuples.
2658    
2659    =item keyIndex (optional)
2660    
2661    Index into each tuple of its key field. The default is 0.
2662    
2663    =item RETURN
2664    
2665    Returns a 2-tuple consisting of a reference to the list of items that are only in the new
2666    list (inserted) followed by a reference to the list of items that are only in the old
2667    list (deleted).
2668    
2669    =back
2670    
2671    =cut
2672    
2673    sub CompareLists {
2674        # Get the parameters.
2675        my ($newList, $oldList, $keyIndex) = @_;
2676        if (! defined $keyIndex) {
2677            $keyIndex = 0;
2678        }
2679        # Declare the return variables.
2680        my ($inserted, $deleted) = ([], []);
2681        # Loop through the two lists simultaneously.
2682        my ($newI, $oldI) = (0, 0);
2683        my ($newN, $oldN) = (scalar @{$newList}, scalar @{$oldList});
2684        while ($newI < $newN || $oldI < $oldN) {
2685            # Get the current object in each list. Note that if one
2686            # of the lists is past the end, we'll get undef.
2687            my $newItem = $newList->[$newI];
2688            my $oldItem = $oldList->[$oldI];
2689            if (! defined($newItem) || defined($oldItem) && $newItem->[$keyIndex] gt $oldItem->[$keyIndex]) {
2690                # The old item is not in the new list, so mark it deleted.
2691                push @{$deleted}, $oldItem;
2692                $oldI++;
2693            } elsif (! defined($oldItem) || $oldItem->[$keyIndex] gt $newItem->[$keyIndex]) {
2694                # The new item is not in the old list, so mark it inserted.
2695                push @{$inserted}, $newItem;
2696                $newI++;
2697            } else {
2698                # The item is in both lists, so push forward.
2699                $oldI++;
2700                $newI++;
2701            }
2702        }
2703        # Return the result.
2704        return ($inserted, $deleted);
2705    }
2706    
2707    =head3 GetLine
2708    
2709    C<< my @data = Tracer::GetLine($handle); >>
2710    
2711    Read a line of data from a tab-delimited file.
2712    
2713    =over 4
2714    
2715    =item handle
2716    
2717    Open file handle from which to read.
2718    
2719    =item RETURN
2720    
2721    Returns a list of the fields in the record read. The fields are presumed to be
2722    tab-delimited. If we are at the end of the file, then an empty list will be
2723    returned. If an empty line is read, a single list item consisting of a null
2724    string will be returned.
2725    
2726    =back
2727    
2728    =cut
2729    
2730    sub GetLine {
2731        # Get the parameters.
2732        my ($handle) = @_;
2733        # Declare the return variable.
2734        my @retVal = ();
2735        # Read from the file.
2736        my $line = <$handle>;
2737        # Only proceed if we found something.
2738        if (defined $line) {
2739            # Remove the new-line.
2740            chomp $line;
2741            # If the line is empty, return a single empty string; otherwise, parse
2742            # it into fields.
2743            if ($line eq "") {
2744                push @retVal, "";
2745            } else {
2746                push @retVal, split /\t/,$line;
2747            }
2748        }
2749        # Return the result.
2750        return @retVal;
2751    }
2752    
2753    =head3 PutLine
2754    
2755    C<< Tracer::PutLine($handle, \@fields); >>
2756    
2757    Write a line of data to a tab-delimited file. The specified field values will be
2758    output in tab-separated form, with a trailing new-line.
2759    
2760    =over 4
2761    
2762    =item handle
2763    
2764    Output file handle.
2765    
2766    =item fields
2767    
2768    List of field values.
2769    
2770    =back
2771    
2772    =cut
2773    
2774    sub PutLine {
2775        # Get the parameters.
2776        my ($handle, $fields) = @_;
2777        # Write the data.
2778        print $handle join("\t", @{$fields}) . "\n";
2779    }
2780    
2781    =head3 GenerateURL
2782    
2783    C<< my $queryUrl = Tracer::GenerateURL($page, %parameters); >>
2784    
2785    Generate a GET-style URL for the specified page with the specified parameter
2786    names and values. The values will be URL-escaped automatically. So, for
2787    example
2788    
2789        Tracer::GenerateURL("form.cgi", type => 1, string => "\"high pass\" or highway")
2790    
2791    would return
2792    
2793        form.cgi?type=1&string=%22high%20pass%22%20or%20highway
2794    
2795    =over 4
2796    
2797    =item page
2798    
2799    Page URL.
2800    
2801    =item parameters
2802    
2803    Hash mapping parameter names to parameter values.
2804    
2805    =item RETURN
2806    
2807    Returns a GET-style URL that goes to the specified page and passes in the
2808    specified parameters and values.
2809    
2810    =back
2811    
2812    =cut
2813    
2814    sub GenerateURL {
2815        # Get the parameters.
2816        my ($page, %parameters) = @_;
2817        # Prime the return variable with the page URL.
2818        my $retVal = $page;
2819        # Loop through the parameters, creating parameter elements in a list.
2820        my @parmList = map { "$_=" . uri_escape($parameters{$_}) } keys %parameters;
2821        # If the list is nonempty, tack it on.
2822        if (@parmList) {
2823            $retVal .= "?" . join("&", @parmList);
2824        }
2825        # Return the result.
2826        return $retVal;
2827  }  }
2828    
2829  1;  1;

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