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# Line 1  Line 1 
1    #
2    # Copyright (c) 2003-2006 University of Chicago and Fellowship
3    # for Interpretations of Genomes. All Rights Reserved.
4    #
5    # This file is part of the SEED Toolkit.
6    #
7    # The SEED Toolkit is free software. You can redistribute
8    # it and/or modify it under the terms of the SEED Toolkit
9    # Public License.
10    #
11    # You should have received a copy of the SEED Toolkit Public License
12    # along with this program; if not write to the University of Chicago
13    # at info@ci.uchicago.edu or the Fellowship for Interpretation of
14    # Genomes at veronika@thefig.info or download a copy from
15    # http://www.theseed.org/LICENSE.TXT.
16    #
17    
18  package Tracer;  package Tracer;
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);      @EXPORT = qw(Trace T TSetup QTrace Confess Cluck Min Max Assert Open OpenDir TICK StandardSetup EmergencyKey ETracing 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;
32        use File::Path;
33        use File::stat;
34        use LWP::UserAgent;
35        use Time::HiRes 'gettimeofday';
36        use URI::Escape;
37        use Time::Local;
38    
39  =head1 Tracing and Debugging Helpers  =head1 Tracing and Debugging Helpers
40    
41  =head2 Introduction  =head2 Tracing
42    
43  This package provides simple tracing for debugging and reporting purposes. To use it simply call the  This package provides simple tracing for debugging and reporting purposes. To use it simply call the
44  L</TSetup> method to set the options and call L</Trace> to write out trace messages. Each trace  L</TSetup> or L</ETracing> method to set the options and call L</Trace> to write out trace messages.
45  message has a I<trace level> and I<category> associated with it. In addition, the tracing package itself  L</TSetup> and L</ETracing> both establish a I<trace level> and a list of I<categories>. Similarly,
46  has a list of categories and a single trace level set by the B<TSetup> method. Only messages whose trace  each trace message has a I<trace level> and I<category> associated with it. Only messages whose trace
47  level is less than or equal to this package's trace level and whose category is activated will  level is less than or equal to the setup trace level and whose category is activated will
48  be written. Thus, a higher trace level on a message indicates that the message  be written. Thus, a higher trace level on a message indicates that the message
49  is less likely to be seen. A higher trace level passed to B<TSetup> means more trace messages will  is less likely to be seen, while a higher trace level passed to B<TSetup> means more trace messages will
50  appear. To generate a trace message, use the following syntax.  appear.
51    
52    =head3 Putting Trace Messages in Your Code
53    
54  C<< Trace($message) if T(errors => 4); >>  To generate a trace message, use the following syntax.
55    
56        Trace($message) if T(errors => 4);
57    
58  This statement will produce a trace message if the trace level is 4 or more and the C<errors>  This statement will produce a trace message if the trace level is 4 or more and the C<errors>
59  category is active. Note that the special category C<main> is always active, so  category is active. There is a special category C<main> that is always active, so
60    
61  C<< Trace($message) if T(main => 4); >>      Trace($message) if T(main => 4);
62    
63  will trace if the trace level is 4 or more.  will trace if the trace level is 4 or more.
64    
# Line 37  Line 66 
66  following call is made in the B<Sprout> package, it will appear if the C<Sprout> category is  following call is made in the B<Sprout> package, it will appear if the C<Sprout> category is
67  active and the trace level is 2 or more.  active and the trace level is 2 or more.
68    
69  C<< Trace($message) if T(2); >>      Trace($message) if T(2);
70    
71    In scripts, where no package name is available, the category defaults to C<main>.
72    
73  To set up tracing, you call the L</TSetup> method. The method takes as input a trace level, a list  =head3 Custom Tracing
74  of category names, and a set of options. The trace level and list of category names are  
75    Many programs have customized tracing configured using the L</TSetup> method. This is no longer
76    the preferred method, but a knowledge of how custom tracing works can make the more modern
77    L</Emergency Tracing> easier to understand.
78    
79    To set up custom tracing, you call the L</TSetup> method. The method takes as input a trace level,
80    a list of category names, and a destination. The trace level and list of category names are
81  specified as a space-delimited string. Thus  specified as a space-delimited string. Thus
82    
83  C<< TSetup('3 errors Sprout ERDB', 'HTML'); >>      TSetup('3 errors Sprout ERDB', 'TEXT');
84    
85  sets the trace level to 3, activates the C<errors>, C<Sprout>, and C<ERDB> categories, and  sets the trace level to 3, activates the C<errors>, C<Sprout>, and C<ERDB> categories, and
86  specifies that messages should be output as HTML paragraphs.  specifies that messages should be sent to the standard output.
87    
88  To turn on tracing for ALL categories, use an asterisk. The call below sets every category to  To turn on tracing for ALL categories, use an asterisk. The call below sets every category to
89  level 3 and writes the output to the standard error output. This sort of thing might be  level 3 and writes the output to the standard error output. This sort of thing might be
90  useful in a CGI environment.  useful in a CGI environment.
91    
92  C<< TSetup('3 *', 'WARN'); >>      TSetup('3 *', 'WARN');
93    
94  In addition to HTML and file output for trace messages, you can specify that the trace messages  In addition standard error and file output for trace messages, you can specify that the trace messages
95  be queued. The messages can then be retrieved by calling the L</QTrace> method. This approach  be queued. The messages can then be retrieved by calling the L</QTrace> method. This approach
96  is useful if you are building a web page. Instead of having the trace messages interspersed with  is useful if you are building a web page. Instead of having the trace messages interspersed with
97  the page output, they can be gathered together and displayed at the end of the page. This makes  the page output, they can be gathered together and displayed at the end of the page. This makes
98  it easier to debug page formatting problems.  it easier to debug page formatting problems.
99    
100  Finally, you can specify that all trace messages be emitted as warnings.  Finally, you can specify that all trace messages be emitted to a file, or the standard output and
101    a file at the same time. To trace to a file, specify the filename with an output character in front
102    of it.
103    
104        TSetup('4 SQL', ">$fileName");
105    
106    To trace to the standard output and a file at the same time, put a C<+> in front of the angle
107    bracket.
108    
109        TSetup('3 *', "+>$fileName");
110    
111  The flexibility of tracing makes it superior to simple use of directives like C<die> and C<warn>.  The flexibility of tracing makes it superior to simple use of directives like C<die> and C<warn>.
112  Tracer calls can be left in the code with minimal overhead and then turned on only when needed.  Tracer calls can be left in the code with minimal overhead and then turned on only when needed.
113  Thus, debugging information is available and easily retrieved even when the application is  Thus, debugging information is available and easily retrieved even when the application is
114  being used out in the field.  being used out in the field.
115    
116    =head3 Trace Levels
117    
118  There is no hard and fast rule on how to use trace levels. The following is therefore only  There is no hard and fast rule on how to use trace levels. The following is therefore only
119  a suggestion.  a suggestion.
120    
121  =over 4  =over 4
122    
123  =item 0 Error  =item Error 0
124    
125  Message indicates an error that may lead to incorrect results or that has stopped the  Message indicates an error that may lead to incorrect results or that has stopped the
126  application entirely.  application entirely.
127    
128  =item 1 Warning  =item Warning 1
129    
130  Message indicates something that is unexpected but that probably did not interfere  Message indicates something that is unexpected but that probably did not interfere
131  with program execution.  with program execution.
132    
133  =item 2 Notice  =item Notice 2
134    
135  Message indicates the beginning or end of a major task.  Message indicates the beginning or end of a major task.
136    
137  =item 3 Information  =item Information 3
138    
139  Message indicates a subtask. In the FIG system, a subtask generally relates to a single  Message indicates a subtask. In the FIG system, a subtask generally relates to a single
140  genome. This would be a big loop that is not expected to execute more than 500 times or so.  genome. This would be a big loop that is not expected to execute more than 500 times or so.
141    
142  =item 4 Detail  =item Detail 4
143    
144  Message indicates a low-level loop iteration.  Message indicates a low-level loop iteration.
145    
146  =back  =back
147    
148    The format of trace messages is important because some utilities analyze trace files.
149    There are three fields-- the time stamp, the category name, and the text.
150    The time stamp is between square brackets and the category name between angle brackets.
151    After the category name there is a colon (C<:>) followed by the message text.
152    If the square brackets or angle brackets are missing, then the trace management
153    utilities assume that they are encountering a set of pre-formatted lines.
154    
155    Note, however, that this formatting is done automatically by the tracing functions. You
156    only need to know about it if you want to parse a trace file.
157    
158    =head3 Emergency Tracing
159    
160    Sometimes, you need a way for tracing to happen automatically without putting parameters
161    in a form or on the command line. Emergency tracing does this. You invoke emergency tracing
162    from the debug form, which is accessed from I<MySeedInstance>C</FIG/Html/SetPassword.html>.
163    Emergency tracing requires you specify a tracing key. For command-line tools, the key is
164    taken from the C<TRACING> environment variable. For web services, the key is taken from
165    a cookie. Either way, the key tells the tracing facility who you are, so that you control
166    the tracing in your environment without stepping on other users.
167    
168    The key can be anything you want. If you don't have a key, the C<SetPassword> page will
169    generate one for you.
170    
171    You can activate and de-activate emergency tracing from the debugging control panel, as
172    well as display the trace file itself.
173    
174    To enable emergency tracing in your code, call
175    
176        ETracing($cgi)
177    
178    from a web script and
179    
180        ETracing()
181    
182    from a command-line script.
183    
184    The web script will look for the tracing key in the cookies, and the command-line
185    script will look for it in the C<TRACING> environment variable. If you are
186    using the L</StandardScript> or L</StandardSetup> methods, emergency tracing
187    will be configured automatically.
188    
189    =head3 Debugging Control Panel
190    
191    The debugging control panel provides several tools to assist in development of
192    SEED and Sprout software. You access the debugging control panel from the URL
193    C</FIG/Html/SetPassword.html> in whichever seed instance you're using. (So,
194    for example, the panel access point for the development NMPDR system is
195    C<http://web-1.nmpdr.org/next/FIG/Html/SetPassword.html>. Contact Bruce to
196    find out what the password is. From this page, you can also specify a tracing
197    key. If you don't specify a key, one will be generated for you.
198    
199    =head4 Emergency Tracing Form
200    
201    At the bottom of the debugging control panel is a form that allows you to
202    specify a trace level and tracing categories. Special and common categories
203    are listed with check boxes. You can hold your mouse over a check box to see
204    what its category does. In general, however, a category name is the same as
205    the name of the package in which the trace message occurs.
206    
207    Additional categories can be entered in an input box, delimited by spaces or commas.
208    
209    The B<Activate> button turns on Emergency tracing at the level you specify with the
210    specified categories active. The B<Terminate> button turns tracing off. The
211    B<Show File> button displays the current contents of the trace file. The tracing
212    form at the bottom of the control panel is designed for emergency tracing, so it
213    will only affect programs that call L</ETracing>, L</StandardScript>,
214    or L</StandardSetup>.
215    
216    =head4 Script Form
217    
218    The top form of the debugging control panel allows you to enter a tiny script and
219    have the output generated in a formatted table. Certain object variables are
220    predefined in the script, including a FIG object (C<$fig>), a CGI object (C<$cgi>),
221    and-- if Sprout is active-- Sprout (C<$sprout>) and SFXlate (C<$sfx>) objects.
222    
223    The last line of the script must be a scalar, but it can be a reference to a hash,
224    a list, a list of lists, and various other combinations. If you select the appropriate
225    data type in the dropdown box, the output will be formatted accordingly. The form
226    also has controls for specifying tracing. These controls override any emergency
227    tracing in effect.
228    
229    =head4 Database Query Forms
230    
231    The forms between the script form and the emergency tracing form allow you to
232    make queries against the database. The FIG query form allows simple queries against
233    a single FIG table. The Sprout query form uses the B<GetAll> method to do a
234    multi-table query against the Sprout database. B<GetAll> is located in the B<ERDB>
235    package, and it takes five parameters.
236    
237        GetAll(\@objectNames, $filterClause, \@parameters, \@fields, $count);
238    
239    Each of the five parameters corresponds to a text box on the query form:
240    
241    =over 4
242    
243    =item Objects
244    
245    Comma-separated list containing the names of the entity and relationship objects to be retrieved.
246    
247    =item Filter
248    
249    WHERE/ORDER BY clause (without the WHERE) to be used to filter and sort the query. The WHERE clause can
250    be parameterized with parameter markers (C<?>). Each field used must be specified in the standard form
251    B<I<objectName>(I<fieldName>)> or B<$I<number>(I<fieldName>)> where I<fieldName> is the name of a
252    field, I<objectName> is the name of the entity or relationship object containing the field, and
253    I<number> is the 1-based position of the object in the object list. Any parameters
254    specified in the filter clause should be specified in the B<Params> field.
255    The fields in a filter clause can come from primary entity relations,
256    relationship relations, or secondary entity relations; however, all of the
257    entities and relationships involved must be included in the list of object names.
258    
259    =item Params
260    
261    List of the parameters to be substituted in for the parameters marks in the filter clause. This
262    is a comma-separated list without any quoting or escaping.
263    
264    =item fields
265    
266    Comma-separated list of the fields to be returned in each element of the list returned. Fields
267    are specified in the same manner as in the filter clause.
268    
269    =item count
270    
271    Maximum number of records to return. If omitted or 0, all available records will be returned.
272    
273    =back
274    
275    B<GetAll> automatically joins together the entities and relationships listed in the object
276    names. This simplifies the coding of the filter clause, but it means that some queries are
277    not possible, since they cannot be expressed in a linear sequence of joins. This is a limitation
278    that has yet to be addressed.
279    
280  =cut  =cut
281    
282  # Declare the configuration variables.  # Declare the configuration variables.
# Line 157  Line 337 
337      # Presume category-based tracing until we learn otherwise.      # Presume category-based tracing until we learn otherwise.
338      $AllTrace = 0;      $AllTrace = 0;
339      # Build the category hash. Note that if we find a "*", we turn on non-category      # Build the category hash. Note that if we find a "*", we turn on non-category
340      # tracing.      # tracing. We must also clear away any pre-existing data.
341        %Categories = ( main => 1 );
342      for my $category (@categoryData) {      for my $category (@categoryData) {
343          if ($category eq '*') {          if ($category eq '*') {
344              $AllTrace = 1;              $AllTrace = 1;
# Line 175  Line 356 
356          }          }
357          if ($target =~ m/^>[^>]/) {          if ($target =~ m/^>[^>]/) {
358              open TRACEFILE, $target;              open TRACEFILE, $target;
359              print TRACEFILE Now() . " Tracing initialized.\n";              print TRACEFILE "[" . Now() . "] <Tracer>: Tracing initialized.\n";
360              close TRACEFILE;              close TRACEFILE;
361              $Destination = ">$target";              $Destination = ">$target";
362          } else {          } else {
# Line 188  Line 369 
369      $SetupCount++;      $SetupCount++;
370  }  }
371    
372    =head3 StandardSetup
373    
374    C<< my ($options, @parameters) = StandardSetup(\@categories, \%options, $parmHelp, @ARGV); >>
375    
376    This method performs standard command-line parsing and tracing setup. The return
377    values are a hash of the command-line options and a list of the positional
378    parameters. Tracing is automatically set up and the command-line options are
379    validated.
380    
381    This is a complex method that does a lot of grunt work. The parameters can
382    be more easily understood, however, once they are examined individually.
383    
384    The I<categories> parameter is the most obtuse. It is a reference to a list of
385    special-purpose tracing categories. Most tracing categories are PERL package
386    names. So, for example, if you wanted to turn on tracing inside the B<Sprout>,
387    B<ERDB>, and B<SproutLoad> packages, you would specify the categories
388    
389        ["Sprout", "SproutLoad", "ERDB"]
390    
391    This would cause trace messages in the specified three packages to appear in
392    the output. There are two special tracing categories that are automatically
393    handled by this method. In other words, if you used L</TSetup> you would need
394    to include these categories manually, but if you use this method they are turned
395    on automatically.
396    
397    =over 4
398    
399    =item SQL
400    
401    Traces SQL commands and activity.
402    
403    =item Tracer
404    
405    Traces error messages and call stacks.
406    
407    =back
408    
409    C<SQL> is only turned on if the C<-sql> option is specified in the command line.
410    The trace level is specified using the C<-trace> command-line option. For example,
411    the following command line for C<TransactFeatures> turns on SQL tracing and runs
412    all tracing at level 3.
413    
414        TransactFeatures -trace=3 -sql register ../xacts IDs.tbl
415    
416    Standard tracing is output to the standard output and echoed to the file
417    C<trace>I<$$>C<.log> in the FIG temporary directory, where I<$$> is the
418    process ID. You can also specify the C<user> parameter to put a user ID
419    instead of a process ID in the trace file name. So, for example
420    
421    The default trace level is 2. To get all messages, specify a trace level of 4.
422    For a genome-by-genome update, use 3.
423    
424        TransactFeatures -trace=3 -sql -user=Bruce register ../xacts IDs.tbl
425    
426    would send the trace output to C<traceBruce.log> in the temporary directory.
427    
428    The I<options> parameter is a reference to a hash containing the command-line
429    options, their default values, and an explanation of what they mean. Command-line
430    options may be in the form of switches or keywords. In the case of a switch, the
431    option value is 1 if it is specified and 0 if it is not specified. In the case
432    of a keyword, the value is separated from the option name by an equal sign. You
433    can see this last in the command-line example above.
434    
435    You can specify a different default trace level by setting C<$options->{trace}>
436    prior to calling this method.
437    
438    An example at this point would help. Consider, for example, the command-line utility
439    C<TransactFeatures>. It accepts a list of positional parameters plus the options
440    C<safe>, C<noAlias>, C<start>, and C<tblFiles>. To start up this command, we execute
441    the following code.
442    
443        my ($options, @parameters) = Tracer::StandardSetup(["DocUtils"],
444                            { safe => [0, "use database transactions"],
445                              noAlias => [0, "do not expect aliases in CHANGE transactions"],
446                              start => [' ', "start with this genome"],
447                              tblFiles => [0, "output TBL files containing the corrected IDs"] },
448                            "command transactionDirectory IDfile",
449                          @ARGV);
450    
451    
452    The call to C<ParseCommand> specifies the default values for the options and
453    stores the actual options in a hash that is returned as C<$options>. The
454    positional parameters are returned in C<@parameters>.
455    
456    The following is a sample command line for C<TransactFeatures>.
457    
458        TransactFeatures -trace=2 -noAlias register ../xacts IDs.tbl
459    
460    In this case, C<register>, C<../xacts>, and C<IDs.tbl> are the positional
461    parameters, and would find themselves in I<@parameters> after executing the
462    above code fragment. The tracing would be set to level 2, and the categories
463    would be C<Tracer>, and <DocUtils>. C<Tracer> is standard,
464    and C<DocUtils> was included because it came in within the first parameter
465    to this method. The I<$options> hash would be
466    
467        { trace => 2, sql => 0, safe => 0,
468          noAlias => 1, start => ' ', tblFiles => 0 }
469    
470    Use of C<StandardSetup> in this way provides a simple way of performing
471    standard tracing setup and command-line parsing. Note that the caller is
472    not even aware of the command-line switches C<-trace> and C<-sql>, which
473    are used by this method to control the tracing. If additional tracing features
474    need to be added in the future, they can be processed by this method without
475    upsetting the command-line utilities.
476    
477    If the C<background> option is specified on the command line, then the
478    standard and error outputs will be directed to files in the temporary
479    directory, using the same suffix as the trace file. So, if the command
480    line specified
481    
482        -user=Bruce -background
483    
484    then the trace output would go to C<traceBruce.log>, the standard output to
485    C<outBruce.log>, and the error output to C<errBruce.log>. This is designed to
486    simplify starting a command in the background.
487    
488    The user name is also used as the tracing key for L</Emergency Tracing>.
489    Specifying a value of C<E> for the trace level causes emergency tracing to
490    be used instead of custom tracing. If the user name is not specified,
491    the tracing key is taken from the C<Tracing> environment variable. If there
492    is no value for that variable, the tracing key will be computed from the PID.
493    
494    Finally, if the special option C<-h> is specified, the option names will
495    be traced at level 0 and the program will exit without processing.
496    This provides a limited help capability. For example, if the user enters
497    
498        TransactFeatures -h
499    
500    he would see the following output.
501    
502        TransactFeatures [options] command transactionDirectory IDfile
503            -trace    tracing level (default E)
504            -sql      trace SQL commands
505            -safe     use database transactions
506            -noAlias  do not expect aliases in CHANGE transactions
507            -start    start with this genome
508            -tblFiles output TBL files containing the corrected IDs
509    
510    The caller has the option of modifying the tracing scheme by placing a value
511    for C<trace> in the incoming options hash. The default value can be overridden,
512    or the tracing to the standard output can be turned off by suffixing a minus
513    sign to the trace level. So, for example,
514    
515        { trace => [0, "tracing level (default 0)"],
516           ...
517    
518    would set the default trace level to 0 instead of E, while
519    
520        { trace => ["2-", "tracing level (default 2)"],
521           ...
522    
523    would set the default to 2, but trace only to the log file, not to the
524    standard output.
525    
526    The parameters to this method are as follows.
527    
528    =over 4
529    
530    =item categories
531    
532    Reference to a list of tracing category names. These should be names of
533    packages whose internal workings will need to be debugged to get the
534    command working.
535    
536    =item options
537    
538    Reference to a hash containing the legal options for the current command mapped
539    to their default values and descriptions. The user can override the defaults
540    by specifying the options as command-line switches prefixed by a hyphen.
541    Tracing-related options may be added to this hash. If the C<-h> option is
542    specified on the command line, the option descriptions will be used to
543    explain the options. To turn off tracing to the standard output, add a
544    minus sign to the value for C<trace> (see above).
545    
546    =item parmHelp
547    
548    A string that vaguely describes the positional parameters. This is used
549    if the user specifies the C<-h> option.
550    
551    =item argv
552    
553    List of command line parameters, including the option switches, which must
554    precede the positional parameters and be prefixed by a hyphen.
555    
556    =item RETURN
557    
558    Returns a list. The first element of the list is the reference to a hash that
559    maps the command-line option switches to their values. These will either be the
560    default values or overrides specified on the command line. The remaining
561    elements of the list are the position parameters, in order.
562    
563    =back
564    
565    =cut
566    
567    sub StandardSetup {
568        # Get the parameters.
569        my ($categories, $options, $parmHelp, @argv) = @_;
570        # Get the default tracing key.
571        my $tkey = EmergencyKey();
572        # Add the tracing options.
573        if (! exists $options->{trace}) {
574            $options->{trace} = ['E', "tracing level (E for emergency tracing)"];
575        }
576        $options->{sql} = [0, "turn on SQL tracing"];
577        $options->{h} = [0, "display command-line options"];
578        $options->{user} = [$tkey, "tracing key"];
579        $options->{background} = [0, "spool standard and error output"];
580        # Create a parsing hash from the options hash. The parsing hash
581        # contains the default values rather than the default value
582        # and the description. While we're at it, we'll memorize the
583        # length of the longest option name.
584        my $longestName = 0;
585        my %parseOptions = ();
586        for my $key (keys %{$options}) {
587            if (length $key > $longestName) {
588                $longestName = length $key;
589            }
590            $parseOptions{$key} = $options->{$key}->[0];
591        }
592        # Parse the command line.
593        my ($retOptions, @retParameters) = ParseCommand(\%parseOptions, @argv);
594        # Get the logfile suffix.
595        my $suffix = $retOptions->{user};
596        # Check for background mode.
597        if ($retOptions->{background}) {
598            my $outFileName = "$FIG_Config::temp/out$suffix.log";
599            my $errFileName = "$FIG_Config::temp/err$suffix.log";
600            open STDOUT, ">$outFileName";
601            open STDERR, ">$errFileName";
602        }
603        # Now we want to set up tracing. First, we need to know if the user
604        # wants emergency tracing.
605        if ($retOptions->{trace} eq 'E') {
606            ETracing($retOptions->{user});
607        } else {
608            # Here the tracing is controlled from the command line.
609            my @cats = @{$categories};
610            if ($retOptions->{sql}) {
611                push @cats, "SQL";
612            }
613            # Add the default categories.
614            push @cats, "Tracer";
615            # Next, we create the category string by joining the categories.
616            my $cats = join(" ", @cats);
617            # Check to determine whether or not the caller wants to turn off tracing
618            # to the standard output.
619            my $traceLevel = $retOptions->{trace};
620            my $textOKFlag = 1;
621            if ($traceLevel =~ /^(.)-/) {
622                $traceLevel = $1;
623                $textOKFlag = 0;
624            }
625            # Now we set up the trace mode.
626            my $traceMode;
627            # Verify that we can open a file in the FIG temporary directory.
628            my $traceFileName = "$FIG_Config::temp/trace$suffix.log";
629            if (open TESTTRACE, ">$traceFileName") {
630                # Here we can trace to a file.
631                $traceMode = ">$traceFileName";
632                if ($textOKFlag) {
633                    # Echo to standard output if the text-OK flag is set.
634                    $traceMode = "+$traceMode";
635                }
636                # Close the test file.
637                close TESTTRACE;
638            } else {
639                # Here we can't trace to a file. We trace to the standard output if it's
640                # okay, and the error log otherwise.
641                if ($textOKFlag) {
642                    $traceMode = "TEXT";
643                } else {
644                    $traceMode = "WARN";
645                }
646            }
647            # Now set up the tracing.
648            TSetup("$traceLevel $cats", $traceMode);
649        }
650        # Check for the "h" option. If it is specified, dump the command-line
651        # options and exit the program.
652        if ($retOptions->{h}) {
653            $0 =~ m#[/\\](\w+)(\.pl)?$#i;
654            print "$1 [options] $parmHelp\n";
655            for my $key (sort keys %{$options}) {
656                my $name = Pad($key, $longestName, 0, ' ');
657                my $desc = $options->{$key}->[1];
658                if ($options->{$key}->[0]) {
659                    $desc .= " (default " . $options->{$key}->[0] . ")";
660                }
661                print "  $name $desc\n";
662            }
663            exit(0);
664        }
665        # Return the parsed parameters.
666        return ($retOptions, @retParameters);
667    }
668    
669  =head3 Setups  =head3 Setups
670    
671  C<< my $count = Tracer::Setups(); >>  C<< my $count = Tracer::Setups(); >>
# Line 348  Line 826 
826    
827  =head3 OpenDir  =head3 OpenDir
828    
829  C<< my @files = OpenDir($dirName, $filtered); >>  C<< my @files = OpenDir($dirName, $filtered, $flag); >>
830    
831  Open a directory and return all the file names. This function essentially performs  Open a directory and return all the file names. This function essentially performs
832  the functions of an C<opendir> and C<readdir>. If the I<$filtered> parameter is  the functions of an C<opendir> and C<readdir>. If the I<$filtered> parameter is
833  set to TRUE, all filenames beginning with a period (C<.>) will be filtered out of  set to TRUE, all filenames beginning with a period (C<.>), dollar sign (C<$>),
834  the return list. If the directory does not open, an exception is thrown. So,  or pound sign (C<#>) and all filenames ending with a tilde C<~>) will be
835  for example,  filtered out of the return list. If the directory does not open and I<$flag> is not
836    set, an exception is thrown. So, for example,
837    
838      my @files = OpenDir("/Volumes/fig/contigs", 1);      my @files = OpenDir("/Volumes/fig/contigs", 1);
839    
840  is effectively the same as  is effectively the same as
841    
842      opendir(TMP, "/Volumes/fig/contigs") || Confess("Could not open /Volumes/fig/contigs.");      opendir(TMP, "/Volumes/fig/contigs") || Confess("Could not open /Volumes/fig/contigs.");
843      my @files = grep { $_ !~ /^\./ } readdir(TMP);      my @files = grep { $_ !~ /^[\.\$\#]/ && $_ !~ /~$/ } readdir(TMP);
844    
845  Similarly, the following code  Similarly, the following code
846    
847      my @files = grep { $_ =~ /^\d/ } OpenDir("/Volumes/fig/orgs");      my @files = grep { $_ =~ /^\d/ } OpenDir("/Volumes/fig/orgs", 0, 1);
848    
849  Returns the names of all files in C</Volumes/fig/orgs> that begin with digits and  Returns the names of all files in C</Volumes/fig/orgs> that begin with digits and
850  automatically throws an error if the directory fails to open.  automatically returns an empty list if the directory fails to open.
851    
852  =over 4  =over 4
853    
# Line 381  Line 860 
860  TRUE if files whose names begin with a period (C<.>) should be automatically removed  TRUE if files whose names begin with a period (C<.>) should be automatically removed
861  from the list, else FALSE.  from the list, else FALSE.
862    
863    =item flag
864    
865    TRUE if a failure to open is okay, else FALSE
866    
867  =back  =back
868    
869  =cut  =cut
870  #: Return Type @;  #: Return Type @;
871  sub OpenDir {  sub OpenDir {
872      # Get the parameters.      # Get the parameters.
873      my ($dirName, $filtered) = @_;      my ($dirName, $filtered, $flag) = @_;
874      # Declare the return variable.      # Declare the return variable.
875      my @retVal;      my @retVal = ();
876      # Open the directory.      # Open the directory.
877      if (opendir(my $dirHandle, $dirName)) {      if (opendir(my $dirHandle, $dirName)) {
878          # The directory opened successfully. Get the appropriate list according to the          # The directory opened successfully. Get the appropriate list according to the
879          # strictures of the filter parameter.          # strictures of the filter parameter.
880          if ($filtered) {          if ($filtered) {
881              @retVal = grep { $_ !~ /^\./ } readdir $dirHandle;              @retVal = grep { $_ !~ /^[\.\$\#]/ && $_ !~ /~$/ } readdir $dirHandle;
882          } else {          } else {
883              @retVal = readdir $dirHandle;              @retVal = readdir $dirHandle;
884          }          }
885      } else {      } elsif (! $flag) {
886          # Here the directory would not open.          # Here the directory would not open and it's considered an error.
887          Confess("Could not open directory $dirName.");          Confess("Could not open directory $dirName.");
888      }      }
889      # Return the result.      # Return the result.
# Line 449  Line 932 
932      return $value;      return $value;
933  }  }
934    
935    =head3 ParseTraceDate
936    
937    C<< my $time = Tracer::ParseTraceDate($dateString); >>
938    
939    Convert a date from the trace file into a PERL timestamp.
940    
941    =over 4
942    
943    =item dateString
944    
945    The date string from the trace file. The format of the string is determined by the
946    L</Now> method.
947    
948    =item RETURN
949    
950    Returns a PERL time, that is, a number of seconds since the epoch, or C<undef> if
951    the time string is invalid.
952    
953    =back
954    
955    =cut
956    
957    sub ParseTraceDate {
958        # Get the parameters.
959        my ($dateString) = @_;
960        # Declare the return variable.
961        my $retVal;
962        # Parse the date.
963        if ($dateString =~ m#(\d+)/(\d+)/(\d+)\s+(\d+):(\d+):(\d+)#) {
964            # Create a time object. Note we need to convert the day, month,
965            # and year to a different base. Years count from 1900, and
966            # the internal month value is relocated to January = 0.
967            $retVal = timelocal($6, $5, $4, $2, $1 - 1, $3 - 1900);
968        }
969        # Return the result.
970        return $retVal;
971    }
972    
973  =head3 LogErrors  =head3 LogErrors
974    
975  C<< Tracer::LogErrors($fileName); >>  C<< Tracer::LogErrors($fileName); >>
# Line 651  Line 1172 
1172      # Get the timestamp.      # Get the timestamp.
1173      my $timeStamp = Now();      my $timeStamp = Now();
1174      # 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.
1175      my $formatted = "$timeStamp <$LastCategory>: " . Strip($message);      my $formatted = "[$timeStamp] <$LastCategory>: " . Strip($message);
1176      # Process according to the destination.      # Process according to the destination.
1177      if ($Destination eq "TEXT") {      if ($Destination eq "TEXT") {
1178          # Write the message to the standard output.          # Write the message to the standard output.
# Line 738  Line 1259 
1259          # Convert it to lower case before we hash it.          # Convert it to lower case before we hash it.
1260          $category = lc $category;          $category = lc $category;
1261          # Use the category and tracelevel to compute the result.          # Use the category and tracelevel to compute the result.
1262            if (ref $traceLevel) {
1263                Confess("Bad trace level.");
1264            } elsif (ref $TraceLevel) {
1265                Confess("Bad trace config.");
1266            }
1267          $retVal = ($traceLevel <= $TraceLevel && ($AllTrace || exists $Categories{$category}));          $retVal = ($traceLevel <= $TraceLevel && ($AllTrace || exists $Categories{$category}));
1268      }      }
1269      # Return the computed result.      # Return the computed result.
# Line 825  Line 1351 
1351  C<< my $codedString = Tracer::Escape($realString); >>  C<< my $codedString = Tracer::Escape($realString); >>
1352    
1353  Escape a string for use in a command length. Tabs will be replaced by C<\t>, new-lines  Escape a string for use in a command length. Tabs will be replaced by C<\t>, new-lines
1354  replaced by C<\n>, and backslashes will be doubled. The effect is to exactly reverse the  replaced by C<\n>, carriage returns will be deleted, and backslashes will be doubled. The
1355  effect of L</UnEscape>.  result is to reverse the effect of L</UnEscape>.
1356    
1357  =over 4  =over 4
1358    
# Line 850  Line 1376 
1376      # Loop through the parameter string, looking for sequences to escape.      # Loop through the parameter string, looking for sequences to escape.
1377      while (length $realString > 0) {      while (length $realString > 0) {
1378          # Look for the first sequence to escape.          # Look for the first sequence to escape.
1379          if ($realString =~ /^(.*?)([\n\t\\])/) {          if ($realString =~ /^(.*?)([\n\t\r\\])/) {
1380              # Here we found it. The text preceding the sequence is in $1. The sequence              # Here we found it. The text preceding the sequence is in $1. The sequence
1381              # itself is in $2. First, move the clear text to the return variable.              # itself is in $2. First, move the clear text to the return variable.
1382              $retVal .= $1;              $retVal .= $1;
1383              # Strip the processed section off the real string.              # Strip the processed section off the real string.
1384              $realString = substr $realString, (length $2) + (length $1);              $realString = substr $realString, (length $2) + (length $1);
1385              # Encode the escape sequence.              # Get the matched character.
1386              my $char = $2;              my $char = $2;
1387                # If we have a CR, we are done.
1388                if ($char ne "\r") {
1389                    # It's not a CR, so encode the escape sequence.
1390              $char =~ tr/\t\n/tn/;              $char =~ tr/\t\n/tn/;
1391              $retVal .= "\\" . $char;              $retVal .= "\\" . $char;
1392                }
1393          } else {          } else {
1394              # Here there are no more escape sequences. The rest of the string is              # Here there are no more escape sequences. The rest of the string is
1395              # transferred unmodified.              # transferred unmodified.
# Line 876  Line 1406 
1406  C<< my $realString = Tracer::UnEscape($codedString); >>  C<< my $realString = Tracer::UnEscape($codedString); >>
1407    
1408  Replace escape sequences with their actual equivalents. C<\t> will be replaced by  Replace escape sequences with their actual equivalents. C<\t> will be replaced by
1409  a tab, C<\n> by a new-line character, and C<\\> by a back-slash.  a tab, C<\n> by a new-line character, and C<\\> by a backslash. C<\r> codes will
1410    be deleted.
1411    
1412  =over 4  =over 4
1413    
# Line 905  Line 1436 
1436          # "\<tab>" no matter what we do.)          # "\<tab>" no matter what we do.)
1437          while (length $codedString > 0) {          while (length $codedString > 0) {
1438              # Look for the first escape sequence.              # Look for the first escape sequence.
1439              if ($codedString =~ /^(.*?)\\(\\|n|t)/) {              if ($codedString =~ /^(.*?)\\(\\|n|t|r)/) {
1440                  # Here we found it. The text preceding the sequence is in $1. The sequence                  # Here we found it. The text preceding the sequence is in $1. The sequence
1441                  # itself is in $2. First, move the clear text to the return variable.                  # itself is in $2. First, move the clear text to the return variable.
1442                  $retVal .= $1;                  $retVal .= $1;
1443                  $codedString = substr $codedString, (2 + length $1);                  $codedString = substr $codedString, (2 + length $1);
1444                  # Decode the escape sequence.                  # Get the escape value.
1445                  my $char = $2;                  my $char = $2;
1446                    # If we have a "\r", we are done.
1447                    if ($char ne 'r') {
1448                        # Here it's not an 'r', so we convert it.
1449                  $char =~ tr/\\tn/\\\t\n/;                  $char =~ tr/\\tn/\\\t\n/;
1450                  $retVal .= $char;                  $retVal .= $char;
1451                    }
1452              } else {              } else {
1453                  # Here there are no more escape sequences. The rest of the string is                  # Here there are no more escape sequences. The rest of the string is
1454                  # transferred unmodified.                  # transferred unmodified.
# Line 1019  Line 1554 
1554      return @inputList;      return @inputList;
1555  }  }
1556    
1557    =head3 Percent
1558    
1559    C<< my $percent = Tracer::Percent($number, $base); >>
1560    
1561    Returns the percent of the base represented by the given number. If the base
1562    is zero, returns zero.
1563    
1564    =over 4
1565    
1566    =item number
1567    
1568    Percent numerator.
1569    
1570    =item base
1571    
1572    Percent base.
1573    
1574    =item RETURN
1575    
1576    Returns the percentage of the base represented by the numerator.
1577    
1578    =back
1579    
1580    =cut
1581    
1582    sub Percent {
1583        # Get the parameters.
1584        my ($number, $base) = @_;
1585        # Declare the return variable.
1586        my $retVal = 0;
1587        # Compute the percent.
1588        if ($base != 0) {
1589            $retVal = $number * 100 / $base;
1590        }
1591        # Return the result.
1592        return $retVal;
1593    }
1594    
1595  =head3 GetFile  =head3 GetFile
1596    
1597  C<< my @fileContents = Tracer::GetFile($fileName); >>  C<< my @fileContents = Tracer::GetFile($fileName); >>
1598    
1599  Return the entire contents of a file.      or
1600    
1601    C<< my $fileContents = Tracer::GetFile($fileName); >>
1602    
1603    Return the entire contents of a file. In list context, line-ends are removed and
1604    each line is a list element. In scalar context, line-ends are replaced by C<\n>.
1605    
1606  =over 4  =over 4
1607    
# Line 1034  Line 1612 
1612  =item RETURN  =item RETURN
1613    
1614  In a list context, returns the entire file as a list with the line terminators removed.  In a list context, returns the entire file as a list with the line terminators removed.
1615  In a scalar context, returns the entire file as a string.  In a scalar context, returns the entire file as a string. If an error occurs opening
1616    the file, an empty list will be returned.
1617    
1618  =back  =back
1619    
# Line 1046  Line 1625 
1625      # Declare the return variable.      # Declare the return variable.
1626      my @retVal = ();      my @retVal = ();
1627      # Open the file for input.      # Open the file for input.
1628      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 {  
1629          # Read the whole file into the return variable, stripping off any terminator          # Read the whole file into the return variable, stripping off any terminator
1630          # characters.          # characters.
1631          my $lineCount = 0;          my $lineCount = 0;
1632          while (my $line = <INPUTFILE>) {      while (my $line = <$handle>) {
1633              $lineCount++;              $lineCount++;
1634              $line = Strip($line);              $line = Strip($line);
1635              push @retVal, $line;              push @retVal, $line;
1636          }          }
1637          # Close it.          # Close it.
1638          close INPUTFILE;      close $handle;
1639          my $actualLines = @retVal;          my $actualLines = @retVal;
1640      }      Trace("$actualLines lines read from file $fileName.") if T(File => 2);
1641      # Return the file's contents in the desired format.      # Return the file's contents in the desired format.
1642      if (wantarray) {      if (wantarray) {
1643          return @retVal;          return @retVal;
# Line 1071  Line 1646 
1646      }      }
1647  }  }
1648    
1649    =head3 PutFile
1650    
1651    C<< Tracer::PutFile($fileName, \@lines); >>
1652    
1653    Write out a file from a list of lines of text.
1654    
1655    =over 4
1656    
1657    =item fileName
1658    
1659    Name of the output file.
1660    
1661    =item lines
1662    
1663    Reference to a list of text lines. The lines will be written to the file in order, with trailing
1664    new-line characters. Alternatively, may be a string, in which case the string will be written without
1665    modification.
1666    
1667    =back
1668    
1669    =cut
1670    
1671    sub PutFile {
1672        # Get the parameters.
1673        my ($fileName, $lines) = @_;
1674        # Open the output file.
1675        my $handle = Open(undef, ">$fileName");
1676        # Count the lines written.
1677        if (ref $lines ne 'ARRAY') {
1678            # Here we have a scalar, so we write it raw.
1679            print $handle $lines;
1680            Trace("Scalar put to file $fileName.") if T(File => 3);
1681        } else {
1682            # Write the lines one at a time.
1683            my $count = 0;
1684            for my $line (@{$lines}) {
1685                print $handle "$line\n";
1686                $count++;
1687            }
1688            Trace("$count lines put to file $fileName.") if T(File => 3);
1689        }
1690        # Close the output file.
1691        close $handle;
1692    }
1693    
1694  =head3 QTrace  =head3 QTrace
1695    
1696  C<< my $data = QTrace($format); >>  C<< my $data = QTrace($format); >>
# Line 1150  Line 1770 
1770  C<< Assert($condition1, $condition2, ... $conditionN); >>  C<< Assert($condition1, $condition2, ... $conditionN); >>
1771    
1772  Return TRUE if all the conditions are true. This method can be used in conjunction with  Return TRUE if all the conditions are true. This method can be used in conjunction with
1773  the OR operator and the L</Confess> method, B<Assert> can function as a debugging assert.  the OR operator and the L</Confess> method as a debugging assert.
1774  So, for example  So, for example
1775    
1776  C<< Assert($recNum >= 0) || Confess("Invalid record number $recNum."); >>  C<< Assert($recNum >= 0) || Confess("Invalid record number $recNum."); >>
# Line 1271  Line 1891 
1891    
1892  =head3 AddToListMap  =head3 AddToListMap
1893    
1894  C<< Tracer::AddToListMap(\%hash, $key, $value); >>  C<< Tracer::AddToListMap(\%hash, $key, $value1, $value2, ... valueN); >>
1895    
1896  Add a key-value pair to a hash of lists. If no value exists for the key, a singleton list  Add a key-value pair to a hash of lists. If no value exists for the key, a singleton list
1897  is created for the key. Otherwise, the new value is pushed onto the list.  is created for the key. Otherwise, the new value is pushed onto the list.
# Line 1286  Line 1906 
1906    
1907  Key for which the value is to be added.  Key for which the value is to be added.
1908    
1909  =item value  =item value1, value2, ... valueN
1910    
1911  Value to add to the key's value list.  List of values to add to the key's value list.
1912    
1913  =back  =back
1914    
# Line 1296  Line 1916 
1916    
1917  sub AddToListMap {  sub AddToListMap {
1918      # Get the parameters.      # Get the parameters.
1919      my ($hash, $key, $value) = @_;      my ($hash, $key, @values) = @_;
1920      # Process according to whether or not the key already has a value.      # Process according to whether or not the key already has a value.
1921      if (! exists $hash->{$key}) {      if (! exists $hash->{$key}) {
1922          $hash->{$key} = [$value];          $hash->{$key} = [@values];
1923      } else {      } else {
1924          push @{$hash->{$key}}, $value;          push @{$hash->{$key}}, @values;
1925      }      }
1926  }  }
1927    
# Line 1309  Line 1929 
1929    
1930  C<< if (Tracer::DebugMode) { ...code... } >>  C<< if (Tracer::DebugMode) { ...code... } >>
1931    
1932  Return TRUE if debug mode has been turned on, else output an error  Return TRUE if debug mode has been turned on, else abort.
 page and return FALSE.  
1933    
1934  Certain CGI scripts are too dangerous to exist in the production  Certain CGI scripts are too dangerous to exist in the production
1935  environment. This method provides a simple way to prevent them  environment. This method provides a simple way to prevent them
1936  from working unless they are explicitly turned on by creating a password  from working unless they are explicitly turned on by creating a password
1937  cookie via the B<SetPassword> script.  If debugging mode  cookie via the B<SetPassword> script.  If debugging mode
1938  is not turned on, an error web page will be output directing the  is not turned on, an error will occur.
 user to enter in the correct password.  
1939    
1940  =cut  =cut
1941    
# Line 1330  Line 1948 
1948      if ($encrypted eq "252dec43280e0c0d6a75ffcec486e61d") {      if ($encrypted eq "252dec43280e0c0d6a75ffcec486e61d") {
1949          $retVal = 1;          $retVal = 1;
1950      } else {      } else {
1951          # Here debug mode is off, so we generate an error page.          # Here debug mode is off, so we generate an error.
1952          my $pageString = PageBuilder::Build("<Html/ErrorPage.html", {}, "Html");          Confess("Cannot use this facility without logging in.");
         print $pageString;  
1953      }      }
1954      # Return the determination indicator.      # Return the determination indicator.
1955      return $retVal;      return $retVal;
# Line 1363  Line 1980 
1980  sub Strip {  sub Strip {
1981      # Get a copy of the parameter string.      # Get a copy of the parameter string.
1982      my ($string) = @_;      my ($string) = @_;
1983      my $retVal = $string;      my $retVal = (defined $string ? $string : "");
1984      # Strip the line terminator characters.      # Strip the line terminator characters.
1985      $retVal =~ s/(\r|\n)+$//g;      $retVal =~ s/(\r|\n)+$//g;
1986      # Return the result.      # Return the result.
# Line 1431  Line 2048 
2048      return $retVal;      return $retVal;
2049  }  }
2050    
2051    =head3 EOF
2052    
2053    This is a constant that is lexically greater than any useful string.
2054    
2055    =cut
2056    
2057    sub EOF {
2058        return "\xFF\xFF\xFF\xFF\xFF";
2059    }
2060    
2061  =head3 TICK  =head3 TICK
2062    
2063  C<< my @results = TICK($commandString); >>  C<< my @results = TICK($commandString); >>
# Line 1472  Line 2099 
2099      return `$commandString`;      return `$commandString`;
2100  }  }
2101    
2102    =head3 ScriptSetup
2103    
2104    C<< my ($cgi, $varHash) = ScriptSetup($noTrace); >>
2105    
2106    Perform standard tracing and debugging setup for scripts. The value returned is
2107    the CGI object followed by a pre-built variable hash.
2108    
2109    The C<Trace> form parameter is used to determine whether or not tracing is active and
2110    which trace modules (other than C<Tracer> itself) should be turned on. Specifying
2111    the C<CGI> trace module will trace parameter and environment information. Parameters are
2112    traced at level 3 and environment variables at level 4. To trace to a file instead of to
2113    the web page, set C<TF> to 1. At the end of the script, the client should call
2114    L</ScriptFinish> to output the web page.
2115    
2116    In some situations, it is not practical to invoke tracing via form parameters. For this
2117    situation, you can turn on emergency tracing from the debugging control panel.
2118    Tracing will then be turned on automatically for all programs that use the L</ETracing>
2119    method, which includes every program that uses this method or L</StandardSetup>.
2120    
2121    =over 4
2122    
2123    =item noTrace (optional)
2124    
2125    If specified, tracing will be suppressed. This is useful if the script wants to set up
2126    tracing manually.
2127    
2128    =item RETURN
2129    
2130    Returns a two-element list consisting of a CGI query object and a variable hash for
2131    the output page.
2132    
2133    =back
2134    
2135    =cut
2136    
2137    sub ScriptSetup {
2138        # Get the parameters.
2139        my ($noTrace) = @_;
2140        # Get the CGI query object.
2141        my $cgi = CGI->new();
2142        # Set up tracing if it's not suppressed.
2143        ETracing($cgi) unless $noTrace;
2144        # Create the variable hash.
2145        my $varHash = { results => '' };
2146        # Return the query object and variable hash.
2147        return ($cgi, $varHash);
2148    }
2149    
2150    =head3 ETracing
2151    
2152    C<< ETracing($parameter); >>
2153    
2154    Set up emergency tracing. Emergency tracing is tracing that is turned
2155    on automatically for any program that calls this method. The emergency
2156    tracing parameters are stored in a a file identified by a tracing key.
2157    If this method is called with a CGI object, then the tracing key is
2158    taken from a cookie. If it is called with no parameters, then the tracing
2159    key is taken from an environment variable. If it is called with a string,
2160    the tracing key is that string.
2161    
2162    =over 4
2163    
2164    =item parameter
2165    
2166    A parameter from which the tracing key is computed. If it is a scalar,
2167    that scalar is used as the tracing key. If it is a CGI object, the
2168    tracing key is taken from the C<IP> cookie. If it is omitted, the
2169    tracing key is taken from the C<TRACING> environment variable. If it
2170    is a CGI object and emergency tracing is not on, the C<Trace> and
2171    C<TF> parameters will be used to determine the type of tracing.
2172    
2173    =back
2174    
2175    =cut
2176    
2177    sub ETracing {
2178        # Get the parameter.
2179        my ($parameter) = @_;
2180        # Check for CGI mode.
2181        my $cgi = (ref $parameter eq 'CGI' ? $parameter : undef);
2182        # Default to no tracing except errors.
2183        my ($tracing, $dest) = ("0", "WARN");
2184        # Check for emergency tracing.
2185        my $tkey = EmergencyKey($parameter);
2186        my $emergencyFile = EmergencyFileName($tkey);
2187        if (-e $emergencyFile) {
2188            # We have the file. Read in the data.
2189            my @tracing = GetFile($emergencyFile);
2190            # Pull off the time limit.
2191            my $expire = shift @tracing;
2192            # Convert it to seconds.
2193            $expire *= 3600;
2194            # Check the file data.
2195            my $stat = stat($emergencyFile);
2196            my ($now) = gettimeofday;
2197            if ($now - $stat->mtime > $expire) {
2198                # Delete the expired file.
2199                unlink $emergencyFile;
2200            } else {
2201                # Emergency tracing is on. Pull off the destination and
2202                # the trace level;
2203                $dest = shift @tracing;
2204                my $level = shift @tracing;
2205                # Convert the destination to a real tracing destination.
2206                # temp directory.
2207                $dest = EmergencyTracingDest($tkey, $dest);
2208                # Insure Tracer is specified.
2209                my %moduleHash = map { $_ => 1 } @tracing;
2210                $moduleHash{Tracer} = 1;
2211                # Set the trace parameter.
2212                $tracing = join(" ", $level, sort keys %moduleHash);
2213            }
2214        } elsif (defined $cgi) {
2215            # There's no emergency tracing, but we have a CGI object, so check
2216            # for tracing from the form parameters.
2217            if ($cgi->param('Trace')) {
2218                # Here the user has requested tracing via a form.
2219                $dest = ($cgi->param('TF') ? ">$FIG_Config::temp/Trace$$.log" : "QUEUE");
2220                $tracing = $cgi->param('Trace') . " Tracer";
2221            }
2222        }
2223        # Setup the tracing we've determined from all the stuff above.
2224        TSetup($tracing, $dest);
2225        # If we're a web script, trace the parameter and environment data.
2226        if (defined $cgi) {
2227            TraceParms($cgi);
2228        }
2229    }
2230    
2231    =head3 EmergencyFileName
2232    
2233    C<< my $fileName = Tracer::EmergencyFileName($tkey); >>
2234    
2235    Return the emergency tracing file name. This is the file that specifies
2236    the tracing information.
2237    
2238    =over 4
2239    
2240    =item tkey
2241    
2242    Tracing key for the current program.
2243    
2244    =item RETURN
2245    
2246    Returns the name of the file to contain the emergency tracing information.
2247    
2248    =back
2249    
2250    =cut
2251    
2252    sub EmergencyFileName {
2253        # Get the parameters.
2254        my ($tkey) = @_;
2255        # Compute the emergency tracing file name.
2256        return "$FIG_Config::temp/Emergency$tkey.txt";
2257    }
2258    
2259    =head3 EmergencyFileTarget
2260    
2261    C<< my $fileName = Tracer::EmergencyFileTarget($tkey); >>
2262    
2263    Return the emergency tracing target file name. This is the file that receives
2264    the tracing output for file-based tracing.
2265    
2266    =over 4
2267    
2268    =item tkey
2269    
2270    Tracing key for the current program.
2271    
2272    =item RETURN
2273    
2274    Returns the name of the file to contain the trace output.
2275    
2276    =back
2277    
2278    =cut
2279    
2280    sub EmergencyFileTarget {
2281        # Get the parameters.
2282        my ($tkey) = @_;
2283        # Compute the emergency tracing file name.
2284        return "$FIG_Config::temp/trace$tkey.log";
2285    }
2286    
2287    =head3 EmergencyTracingDest
2288    
2289    C<< my $dest = Tracer::EmergencyTracingDest($tkey, $myDest); >>
2290    
2291    This method converts an emergency tracing destination to a real
2292    tracing destination. The main difference is that if the
2293    destination is C<FILE> or C<APPEND>, we convert it to file
2294    output.
2295    
2296    =over 4
2297    
2298    =item tkey
2299    
2300    Tracing key for this environment.
2301    
2302    =item myDest
2303    
2304    Destination from the emergency tracing file.
2305    
2306    =item RETURN
2307    
2308    Returns a destination that can be passed into L</TSetup>.
2309    
2310    =back
2311    
2312    =cut
2313    
2314    sub EmergencyTracingDest {
2315        # Get the parameters.
2316        my ($tkey, $myDest) = @_;
2317        # Declare the return variable.
2318        my $retVal;
2319        # Process according to the destination value.
2320        if ($myDest eq 'FILE') {
2321            $retVal = ">" . EmergencyFileTarget($tkey);
2322        } elsif ($myDest eq 'APPEND') {
2323            $retVal = ">>" . EmergencyFileTarget($tkey);
2324        } else {
2325            $retVal = $myDest;
2326        }
2327        # Return the result.
2328        return $retVal;
2329    }
2330    
2331    =head3 Emergency
2332    
2333    C<< Emergency($key, $hours, $dest, $level, @modules); >>
2334    
2335    Turn on emergency tracing. This method can only be invoked over the web and is
2336    should not be called if debug mode is off. The caller specifies the duration of the
2337    emergency in hours, the desired tracing destination, the trace level,
2338    and a list of the trace modules to activate. For the length of the duration, when a
2339    program in an environment with the specified tracing key active invokes a Sprout
2340    CGI script, tracing will be turned on automatically. See L</TSetup> for more
2341    about tracing setup and L</ETracing> for more about emergency tracing.
2342    
2343    =over 4
2344    
2345    =item tkey
2346    
2347    The tracing key. This is used to identify the control file and the trace file.
2348    
2349    =item hours
2350    
2351    Number of hours to keep emergency tracing alive.
2352    
2353    =item dest
2354    
2355    Tracing destination. If no path information is specified for a file
2356    destination, it is put in the FIG temporary directory.
2357    
2358    =item level
2359    
2360    Tracing level. A higher level means more trace messages.
2361    
2362    =item modules
2363    
2364    A list of the tracing modules to activate.
2365    
2366    =back
2367    
2368    =cut
2369    
2370    sub Emergency {
2371        # Get the parameters.
2372        my ($tkey, $hours, $dest, $level, @modules) = @_;
2373        # Create the emergency file.
2374        my $specFile = EmergencyFileName($tkey);
2375        my $outHandle = Open(undef, ">$specFile");
2376        print $outHandle join("\n", $hours, $dest, $level, @modules, "");
2377    }
2378    
2379    =head3 EmergencyKey
2380    
2381    C<< my $tkey = EmergencyKey($parameter); >>
2382    
2383    Return the Key to be used for emergency tracing. This could be an IP address,
2384     a session ID, or a user name, depending on the environment.
2385    
2386    =over 4
2387    
2388    =item parameter
2389    
2390    Parameter defining the method for finding the tracing key. If it is a scalar,
2391    then it is presumed to be the tracing key itself. If it is a CGI object, then
2392    the tracing key is taken from the C<IP> cookie. Otherwise, the tracing key is
2393    taken from the C<TRACING> environment variable.
2394    
2395    =item RETURN
2396    
2397    Returns the key to be used for labels in emergency tracing.
2398    
2399    =back
2400    
2401    =cut
2402    
2403    sub EmergencyKey {
2404        # Get the parameters.
2405        my ($parameter) = @_;
2406        # Declare the return variable.
2407        my $retVal;
2408        # Determine the parameter type.
2409        if (! defined $parameter) {
2410            # Here we're supposed to check the environment.
2411            $retVal = $ENV{TRACING};
2412        } else {
2413            my $ptype = ref $parameter;
2414            if ($ptype eq 'CGI') {
2415                # Here we were invoked from a web page. Look for a cookie.
2416                $retVal = $parameter->cookie('IP');
2417            } elsif (! $ptype) {
2418                # Here the key was passed in.
2419                $retVal = $parameter;
2420            }
2421        }
2422        # If no luck finding a key, use the PID.
2423        if (! defined $retVal) {
2424            $retVal = $$;
2425        }
2426        # Return the result.
2427        return $retVal;
2428    }
2429    
2430    
2431    =head3 TraceParms
2432    
2433    C<< Tracer::TraceParms($cgi); >>
2434    
2435    Trace the CGI parameters at trace level CGI => 3 and the environment variables
2436    at level CGI => 4.
2437    
2438    =over 4
2439    
2440    =item cgi
2441    
2442    CGI query object containing the parameters to trace.
2443    
2444    =back
2445    
2446    =cut
2447    
2448    sub TraceParms {
2449        # Get the parameters.
2450        my ($cgi) = @_;
2451        if (T(CGI => 3)) {
2452            # Here we want to trace the parameter data.
2453            my @names = $cgi->param;
2454            for my $parmName (sort @names) {
2455                # Note we skip the Trace parameters, which are for our use only.
2456                if ($parmName ne 'Trace' && $parmName ne 'TF') {
2457                    my @values = $cgi->param($parmName);
2458                    Trace("CGI: $parmName = " . join(", ", @values));
2459                }
2460            }
2461            # Display the request method.
2462            my $method = $cgi->request_method();
2463            Trace("Method: $method");
2464        }
2465        if (T(CGI => 4)) {
2466            # Here we want the environment data too.
2467            for my $envName (sort keys %ENV) {
2468                Trace("ENV: $envName = $ENV{$envName}");
2469            }
2470        }
2471    }
2472    
2473    =head3 ScriptFinish
2474    
2475    C<< ScriptFinish($webData, $varHash); >>
2476    
2477    Output a web page at the end of a script. Either the string to be output or the
2478    name of a template file can be specified. If the second parameter is omitted,
2479    it is assumed we have a string to be output; otherwise, it is assumed we have the
2480    name of a template file. The template should have the variable C<DebugData>
2481    specified in any form that invokes a standard script. If debugging mode is turned
2482    on, a form field will be put in that allows the user to enter tracing data.
2483    Trace messages will be placed immediately before the terminal C<BODY> tag in
2484    the output, formatted as a list.
2485    
2486    A typical standard script would loook like the following.
2487    
2488        BEGIN {
2489            # Print the HTML header.
2490            print "CONTENT-TYPE: text/html\n\n";
2491        }
2492        use Tracer;
2493        use CGI;
2494        use FIG;
2495        # ... more uses ...
2496    
2497        my ($cgi, $varHash) = ScriptSetup();
2498        eval {
2499            # ... get data from $cgi, put it in $varHash ...
2500        };
2501        if ($@) {
2502            Trace("Script Error: $@") if T(0);
2503        }
2504        ScriptFinish("Html/MyTemplate.html", $varHash);
2505    
2506    The idea here is that even if the script fails, you'll see trace messages and
2507    useful output.
2508    
2509    =over 4
2510    
2511    =item webData
2512    
2513    A string containing either the full web page to be written to the output or the
2514    name of a template file from which the page is to be constructed. If the name
2515    of a template file is specified, then the second parameter must be present;
2516    otherwise, it must be absent.
2517    
2518    =item varHash (optional)
2519    
2520    If specified, then a reference to a hash mapping variable names for a template
2521    to their values. The template file will be read into memory, and variable markers
2522    will be replaced by data in this hash reference.
2523    
2524    =back
2525    
2526    =cut
2527    
2528    sub ScriptFinish {
2529        # Get the parameters.
2530        my ($webData, $varHash) = @_;
2531        # Check for a template file situation.
2532        my $outputString;
2533        if (defined $varHash) {
2534            # Here we have a template file. We need to determine the template type.
2535            my $template;
2536            if ($FIG_Config::template_url && $webData =~ /\.php$/) {
2537                $template = "$FIG_Config::template_url/$webData";
2538            } else {
2539                $template = "<<$webData";
2540            }
2541            $outputString = PageBuilder::Build($template, $varHash, "Html");
2542        } else {
2543            # Here the user gave us a raw string.
2544            $outputString = $webData;
2545        }
2546        # Check for trace messages.
2547        if ($Destination ne "NONE" && $TraceLevel > 0) {
2548            # We have trace messages, so we want to put them at the end of the body. This
2549            # is either at the end of the whole string or at the beginning of the BODY
2550            # end-tag.
2551            my $pos = length $outputString;
2552            if ($outputString =~ m#</body>#gi) {
2553                $pos = (pos $outputString) - 7;
2554            }
2555            # If the trace messages were queued, we unroll them. Otherwise, we display the
2556            # destination.
2557            my $traceHtml;
2558            if ($Destination eq "QUEUE") {
2559                $traceHtml = QTrace('Html');
2560            } elsif ($Destination =~ /^>>(.+)$/) {
2561                # Here the tracing output it to a file. We code it as a hyperlink so the user
2562                # can copy the file name into the clipboard easily.
2563                my $actualDest = $1;
2564                $traceHtml = "<p>Tracing output to $actualDest.</p>\n";
2565            } else {
2566                # Here we have one of the special destinations.
2567                $traceHtml = "<P>Tracing output type is $Destination.</p>\n";
2568            }
2569            substr $outputString, $pos, 0, $traceHtml;
2570        }
2571        # Write the output string.
2572        print $outputString;
2573    }
2574    
2575    =head3 Insure
2576    
2577    C<< Insure($dirName); >>
2578    
2579    Insure a directory is present.
2580    
2581    =over 4
2582    
2583    =item dirName
2584    
2585    Name of the directory to check. If it does not exist, it will be created.
2586    
2587    =back
2588    
2589    =cut
2590    
2591    sub Insure {
2592        my ($dirName) = @_;
2593        if (! -d $dirName) {
2594            Trace("Creating $dirName directory.") if T(File => 2);
2595            eval { mkpath $dirName; };
2596            if ($@) {
2597                Confess("Error creating $dirName: $@");
2598            }
2599        }
2600    }
2601    
2602    =head3 ChDir
2603    
2604    C<< ChDir($dirName); >>
2605    
2606    Change to the specified directory.
2607    
2608    =over 4
2609    
2610    =item dirName
2611    
2612    Name of the directory to which we want to change.
2613    
2614    =back
2615    
2616    =cut
2617    
2618    sub ChDir {
2619        my ($dirName) = @_;
2620        if (! -d $dirName) {
2621            Confess("Cannot change to directory $dirName: no such directory.");
2622        } else {
2623            Trace("Changing to directory $dirName.") if T(File => 4);
2624            my $okFlag = chdir $dirName;
2625            if (! $okFlag) {
2626                Confess("Error switching to directory $dirName.");
2627            }
2628        }
2629    }
2630    
2631    =head3 SendSMS
2632    
2633    C<< my $msgID = Tracer::SendSMS($phoneNumber, $msg); >>
2634    
2635    Send a text message to a phone number using Clickatell. The FIG_Config file must contain the
2636    user name, password, and API ID for the relevant account in the hash reference variable
2637    I<$FIG_Config::phone>, using the keys C<user>, C<password>, and C<api_id>. For
2638    example, if the user name is C<BruceTheHumanPet>, the password is C<silly>, and the API ID
2639    is C<2561022>, then the FIG_Config file must contain
2640    
2641        $phone =  { user => 'BruceTheHumanPet',
2642                    password => 'silly',
2643                    api_id => '2561022' };
2644    
2645    The original purpose of this method was to insure Bruce would be notified immediately when the
2646    Sprout Load terminates. Care should be taken if you do not wish Bruce to be notified immediately
2647    when you call this method.
2648    
2649    The message ID will be returned if successful, and C<undef> if an error occurs.
2650    
2651    =over 4
2652    
2653    =item phoneNumber
2654    
2655    Phone number to receive the message, in international format. A United States phone number
2656    would be prefixed by "1". A British phone number would be prefixed by "44".
2657    
2658    =item msg
2659    
2660    Message to send to the specified phone.
2661    
2662    =item RETURN
2663    
2664    Returns the message ID if successful, and C<undef> if the message could not be sent.
2665    
2666    =back
2667    
2668    =cut
2669    
2670    sub SendSMS {
2671        # Get the parameters.
2672        my ($phoneNumber, $msg) = @_;
2673        # Declare the return variable. If we do not change it, C<undef> will be returned.
2674        my $retVal;
2675        # Only proceed if we have phone support.
2676        if (! defined $FIG_Config::phone) {
2677            Trace("Phone support not present in FIG_Config.") if T(1);
2678        } else {
2679            # Get the phone data.
2680            my $parms = $FIG_Config::phone;
2681            # Get the Clickatell URL.
2682            my $url = "http://api.clickatell.com/http/";
2683            # Create the user agent.
2684            my $ua = LWP::UserAgent->new;
2685            # Request a Clickatell session.
2686            my $resp = $ua->post("$url/sendmsg", { user => $parms->{user},
2687                                         password => $parms->{password},
2688                                         api_id => $parms->{api_id},
2689                                         to => $phoneNumber,
2690                                         text => $msg});
2691            # Check for an error.
2692            if (! $resp->is_success) {
2693                Trace("Alert failed.") if T(1);
2694            } else {
2695                # Get the message ID.
2696                my $rstring = $resp->content;
2697                if ($rstring =~ /^ID:\s+(.*)$/) {
2698                    $retVal = $1;
2699                } else {
2700                    Trace("Phone attempt failed with $rstring") if T(1);
2701                }
2702            }
2703        }
2704        # Return the result.
2705        return $retVal;
2706    }
2707    
2708    =head3 CommaFormat
2709    
2710    C<< my $formatted = Tracer::CommaFormat($number); >>
2711    
2712    Insert commas into a number.
2713    
2714    =over 4
2715    
2716    =item number
2717    
2718    A sequence of digits.
2719    
2720    =item RETURN
2721    
2722    Returns the same digits with commas strategically inserted.
2723    
2724    =back
2725    
2726    =cut
2727    
2728    sub CommaFormat {
2729        # Get the parameters.
2730        my ($number) = @_;
2731        # Pad the length up to a multiple of three.
2732        my $padded = "$number";
2733        $padded = " " . $padded while length($padded) % 3 != 0;
2734        # This is a fancy PERL trick. The parentheses in the SPLIT pattern
2735        # cause the delimiters to be included in the output stream. The
2736        # GREP removes the empty strings in between the delimiters.
2737        my $retVal = join(",", grep { $_ ne '' } split(/(...)/, $padded));
2738        # Clean out the spaces.
2739        $retVal =~ s/ //g;
2740        # Return the result.
2741        return $retVal;
2742    }
2743    =head3 SetPermissions
2744    
2745    C<< Tracer::SetPermissions($dirName, $group, $mask, %otherMasks); >>
2746    
2747    Set the permissions for a directory and all the files and folders inside it.
2748    In addition, the group ownership will be changed to the specified value.
2749    
2750    This method is more vulnerable than most to permission and compatability
2751    problems, so it does internal error recovery.
2752    
2753    =over 4
2754    
2755    =item dirName
2756    
2757    Name of the directory to process.
2758    
2759    =item group
2760    
2761    Name of the group to be assigned.
2762    
2763    =item mask
2764    
2765    Permission mask. Bits that are C<1> in this mask will be ORed into the
2766    permission bits of any file or directory that does not already have them
2767    set to 1.
2768    
2769    =item otherMasks
2770    
2771    Map of search patterns to permission masks. If a directory name matches
2772    one of the patterns, that directory and all its members and subdirectories
2773    will be assigned the new pattern. For example, the following would
2774    assign 01664 to most files, but would use 01777 for directories named C<tmp>.
2775    
2776        Tracer::SetPermissions($dirName, 'fig', 01664, '^tmp$' => 01777);
2777    
2778    The list is ordered, so the following would use 0777 for C<tmp1> and
2779    0666 for C<tmp>, C<tmp2>, or C<tmp3>.
2780    
2781        Tracer::SetPermissions($dirName, 'fig', 01664, '^tmp1' => 0777,
2782                                                       '^tmp' => 0666);
2783    
2784    Note that the pattern matches are all case-insensitive, and only directory
2785    names are matched, not file names.
2786    
2787    =back
2788    
2789    =cut
2790    
2791    sub SetPermissions {
2792        # Get the parameters.
2793        my ($dirName, $group, $mask, @otherMasks) = @_;
2794        # Set up for error recovery.
2795        eval {
2796            # Switch to the specified directory.
2797            ChDir($dirName);
2798            # Get the group ID.
2799            my $gid = getgrnam($group);
2800            # Get the mask for tracing.
2801            my $traceMask = sprintf("%04o", $mask) . "($mask)";
2802            Trace("Fixing permissions for directory $dirName using group $group($gid) and mask $traceMask.") if T(File => 2);
2803            my $fixCount = 0;
2804            my $lookCount = 0;
2805            # @dirs will be a stack of directories to be processed.
2806            my @dirs = (getcwd());
2807            while (scalar(@dirs) > 0) {
2808                # Get the current directory.
2809                my $dir = pop @dirs;
2810                # Check for a match to one of the specified directory names. To do
2811                # that, we need to pull the individual part of the name off of the
2812                # whole path.
2813                my $simpleName = $dir;
2814                if ($dir =~ m!/([^/]+)$!) {
2815                    $simpleName = $1;
2816                }
2817                Trace("Simple directory name for $dir is $simpleName.") if T(File => 4);
2818                # Search for a match.
2819                my $match = 0;
2820                my $i;
2821                for ($i = 0; $i < $#otherMasks && ! $match; $i += 2) {
2822                    my $pattern = $otherMasks[$i];
2823                    if ($simpleName =~ /$pattern/i) {
2824                        $match = 1;
2825                    }
2826                }
2827                # Check for a match. Note we use $i-1 because the loop added 2
2828                # before terminating due to the match.
2829                if ($match && $otherMasks[$i-1] != $mask) {
2830                    # This directory matches one of the incoming patterns, and it's
2831                    # a different mask, so we process it recursively with that mask.
2832                    SetPermissions($dir, $group, $otherMasks[$i-1], @otherMasks);
2833                } else {
2834                    # Here we can process normally. Get all of the non-hidden members.
2835                    my @submems = OpenDir($dir, 1);
2836                    for my $submem (@submems) {
2837                        # Get the full name.
2838                        my $thisMem = "$dir/$submem";
2839                        Trace("Checking member $thisMem.") if T(4);
2840                        $lookCount++;
2841                        if ($lookCount % 1000 == 0) {
2842                            Trace("$lookCount members examined. Current is $thisMem. Mask is $traceMask") if T(File => 3);
2843                        }
2844                        # Fix the group.
2845                        chown -1, $gid, $thisMem;
2846                        # Insure this member is not a symlink.
2847                        if (! -l $thisMem) {
2848                            # Get its info.
2849                            my $fileInfo = stat $thisMem;
2850                            # Only proceed if we got the info. Otherwise, it's a hard link
2851                            # and we want to skip it anyway.
2852                            if ($fileInfo) {
2853                                my $fileMode = $fileInfo->mode;
2854                                if (($fileMode & $mask) != $mask) {
2855                                    # Fix this member.
2856                                    $fileMode |= $mask;
2857                                    chmod $fileMode, $thisMem;
2858                                    $fixCount++;
2859                                }
2860                                # If it's a subdirectory, stack it.
2861                                if (-d $thisMem) {
2862                                    push @dirs, $thisMem;
2863                                }
2864                            }
2865                        }
2866                    }
2867                }
2868            }
2869            Trace("$lookCount files and directories processed, $fixCount fixed.") if T(File => 2);
2870        };
2871        # Check for an error.
2872        if ($@) {
2873            Confess("SetPermissions error: $@");
2874        }
2875    }
2876    
2877    =head3 CompareLists
2878    
2879    C<< my ($inserted, $deleted) = Tracer::CompareLists(\@newList, \@oldList, $keyIndex); >>
2880    
2881    Compare two lists of tuples, and return a hash analyzing the differences. The lists
2882    are presumed to be sorted alphabetically by the value in the $keyIndex column.
2883    The return value contains a list of items that are only in the new list
2884    (inserted) and only in the old list (deleted).
2885    
2886    =over 4
2887    
2888    =item newList
2889    
2890    Reference to a list of new tuples.
2891    
2892    =item oldList
2893    
2894    Reference to a list of old tuples.
2895    
2896    =item keyIndex (optional)
2897    
2898    Index into each tuple of its key field. The default is 0.
2899    
2900    =item RETURN
2901    
2902    Returns a 2-tuple consisting of a reference to the list of items that are only in the new
2903    list (inserted) followed by a reference to the list of items that are only in the old
2904    list (deleted).
2905    
2906    =back
2907    
2908    =cut
2909    
2910    sub CompareLists {
2911        # Get the parameters.
2912        my ($newList, $oldList, $keyIndex) = @_;
2913        if (! defined $keyIndex) {
2914            $keyIndex = 0;
2915        }
2916        # Declare the return variables.
2917        my ($inserted, $deleted) = ([], []);
2918        # Loop through the two lists simultaneously.
2919        my ($newI, $oldI) = (0, 0);
2920        my ($newN, $oldN) = (scalar @{$newList}, scalar @{$oldList});
2921        while ($newI < $newN || $oldI < $oldN) {
2922            # Get the current object in each list. Note that if one
2923            # of the lists is past the end, we'll get undef.
2924            my $newItem = $newList->[$newI];
2925            my $oldItem = $oldList->[$oldI];
2926            if (! defined($newItem) || defined($oldItem) && $newItem->[$keyIndex] gt $oldItem->[$keyIndex]) {
2927                # The old item is not in the new list, so mark it deleted.
2928                push @{$deleted}, $oldItem;
2929                $oldI++;
2930            } elsif (! defined($oldItem) || $oldItem->[$keyIndex] gt $newItem->[$keyIndex]) {
2931                # The new item is not in the old list, so mark it inserted.
2932                push @{$inserted}, $newItem;
2933                $newI++;
2934            } else {
2935                # The item is in both lists, so push forward.
2936                $oldI++;
2937                $newI++;
2938            }
2939        }
2940        # Return the result.
2941        return ($inserted, $deleted);
2942    }
2943    
2944    =head3 GetLine
2945    
2946    C<< my @data = Tracer::GetLine($handle); >>
2947    
2948    Read a line of data from a tab-delimited file.
2949    
2950    =over 4
2951    
2952    =item handle
2953    
2954    Open file handle from which to read.
2955    
2956    =item RETURN
2957    
2958    Returns a list of the fields in the record read. The fields are presumed to be
2959    tab-delimited. If we are at the end of the file, then an empty list will be
2960    returned. If an empty line is read, a single list item consisting of a null
2961    string will be returned.
2962    
2963    =back
2964    
2965    =cut
2966    
2967    sub GetLine {
2968        # Get the parameters.
2969        my ($handle) = @_;
2970        # Declare the return variable.
2971        my @retVal = ();
2972        Trace("File position is " . tell($handle) . ". EOF flag is " . eof($handle) . ".") if T(File => 4);
2973        # Read from the file.
2974        my $line = <$handle>;
2975        # Only proceed if we found something.
2976        if (defined $line) {
2977            # Remove the new-line.
2978            chomp $line;
2979            Trace("Line read: $line") if T(File => 4);
2980            # If the line is empty, return a single empty string; otherwise, parse
2981            # it into fields.
2982            if ($line eq "") {
2983                push @retVal, "";
2984            } else {
2985                push @retVal, split /\t/,$line;
2986            }
2987        } else {
2988            # Trace the reason the read failed.
2989            Trace("End of file: $!") if T(File => 3);
2990        }
2991        # Return the result.
2992        return @retVal;
2993    }
2994    
2995    =head3 PutLine
2996    
2997    C<< Tracer::PutLine($handle, \@fields); >>
2998    
2999    Write a line of data to a tab-delimited file. The specified field values will be
3000    output in tab-separated form, with a trailing new-line.
3001    
3002    =over 4
3003    
3004    =item handle
3005    
3006    Output file handle.
3007    
3008    =item fields
3009    
3010    List of field values.
3011    
3012    =back
3013    
3014    =cut
3015    
3016    sub PutLine {
3017        # Get the parameters.
3018        my ($handle, $fields) = @_;
3019        # Write the data.
3020        print $handle join("\t", @{$fields}) . "\n";
3021    }
3022    
3023    =head3 GenerateURL
3024    
3025    C<< my $queryUrl = Tracer::GenerateURL($page, %parameters); >>
3026    
3027    Generate a GET-style URL for the specified page with the specified parameter
3028    names and values. The values will be URL-escaped automatically. So, for
3029    example
3030    
3031        Tracer::GenerateURL("form.cgi", type => 1, string => "\"high pass\" or highway")
3032    
3033    would return
3034    
3035        form.cgi?type=1;string=%22high%20pass%22%20or%20highway
3036    
3037    =over 4
3038    
3039    =item page
3040    
3041    Page URL.
3042    
3043    =item parameters
3044    
3045    Hash mapping parameter names to parameter values.
3046    
3047    =item RETURN
3048    
3049    Returns a GET-style URL that goes to the specified page and passes in the
3050    specified parameters and values.
3051    
3052    =back
3053    
3054    =cut
3055    
3056    sub GenerateURL {
3057        # Get the parameters.
3058        my ($page, %parameters) = @_;
3059        # Prime the return variable with the page URL.
3060        my $retVal = $page;
3061        # Loop through the parameters, creating parameter elements in a list.
3062        my @parmList = map { "$_=" . uri_escape($parameters{$_}) } keys %parameters;
3063        # If the list is nonempty, tack it on.
3064        if (@parmList) {
3065            $retVal .= "?" . join(";", @parmList);
3066        }
3067        # Return the result.
3068        return $retVal;
3069    }
3070    
3071    =head3 ApplyURL
3072    
3073    C<< Tracer::ApplyURL($table, $target, $url); >>
3074    
3075    Run through a two-dimensional table (or more accurately, a list of lists), converting the
3076    I<$target> column to HTML text having a hyperlink to a URL in the I<$url> column. The
3077    URL column will be deleted by this process and the target column will be HTML-escaped.
3078    
3079    This provides a simple way to process the results of a database query into something
3080    displayable by combining a URL with text.
3081    
3082    =over 4
3083    
3084    =item table
3085    
3086    Reference to a list of lists. The elements in the containing list will be updated by
3087    this method.
3088    
3089    =item target
3090    
3091    The index of the column to be converted into HTML.
3092    
3093    =item url
3094    
3095    The index of the column containing the URL. Note that the URL must have a recognizable
3096    C<http:> at the beginning.
3097    
3098    =back
3099    
3100    =cut
3101    
3102    sub ApplyURL {
3103        # Get the parameters.
3104        my ($table, $target, $url) = @_;
3105        # Loop through the table.
3106        for my $row (@{$table}) {
3107            # Apply the URL to the target cell.
3108            $row->[$target] = CombineURL($row->[$target], $row->[$url]);
3109            # Delete the URL from the row.
3110            delete $row->[$url];
3111        }
3112    }
3113    
3114    =head3 CombineURL
3115    
3116    C<< my $combinedHtml = Tracer::CombineURL($text, $url); >>
3117    
3118    This method will convert the specified text into HTML hyperlinked to the specified
3119    URL. The hyperlinking will only take place if the URL looks legitimate: that is, it
3120    is defined and begins with an C<http:> header.
3121    
3122    =over 4
3123    
3124    =item text
3125    
3126    Text to return. This will be HTML-escaped automatically.
3127    
3128    =item url
3129    
3130    A URL to be hyperlinked to the text. If it does not look like a URL, then the text
3131    will be returned without any hyperlinking.
3132    
3133    =item RETURN
3134    
3135    Returns the original text, HTML-escaped, with the URL hyperlinked to it. If the URL
3136    doesn't look right, the HTML-escaped text will be returned without any further
3137    modification.
3138    
3139    =back
3140    
3141    =cut
3142    
3143    sub CombineURL {
3144        # Get the parameters.
3145        my ($text, $url) = @_;
3146        # Declare the return variable.
3147        my $retVal = CGI::escapeHTML($text);
3148        # Verify the URL.
3149        if (defined($url) && $url =~ m!http://!i) {
3150            # It's good, so we apply it to the text.
3151            $retVal = "<a href=\"$url\">$retVal</a>";
3152        }
3153        # Return the result.
3154        return $retVal;
3155    }
3156    
3157  1;  1;

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