| | 1 | # NewsStats.pm |
| | 2 | # |
| | 3 | # Library functions for the NewsStats package. |
| | 4 | # |
| | 5 | # Copyright (c) 2010-2012 Thomas Hochstein <thh@inter.net> |
| | 6 | # |
| | 7 | # This module can be redistributed and/or modified under the same terms under |
| | 8 | # which Perl itself is published. |
| | 9 | |
| | 10 | package NewsStats; |
| | 11 | |
| | 12 | use strict; |
| | 13 | use warnings; |
| | 14 | our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS); |
| | 15 | |
| | 16 | require Exporter; |
| | 17 | @ISA = qw(Exporter); |
| | 18 | @EXPORT = qw( |
| | 19 | $MyVersion |
| | 20 | $PackageVersion |
| | 21 | $FullPath |
| | 22 | $HomePath |
| | 23 | ShowVersion |
| | 24 | ShowPOD |
| | 25 | ReadConfig |
| | 26 | OverrideConfig |
| | 27 | InitDB |
| | 28 | Bleat |
| | 29 | ); |
| | 30 | @EXPORT_OK = qw( |
| | 31 | GetTimePeriod |
| | 32 | LastMonth |
| | 33 | SplitPeriod |
| | 34 | ListMonth |
| | 35 | ListNewsgroups |
| | 36 | ParseHierarchies |
| | 37 | ReadGroupList |
| | 38 | OutputData |
| | 39 | FormatOutput |
| | 40 | SQLHierarchies |
| | 41 | SQLSortOrder |
| | 42 | SQLGroupList |
| | 43 | SQLSetBounds |
| | 44 | SQLBuildClause |
| | 45 | GetMaxLength |
| | 46 | ); |
| | 47 | %EXPORT_TAGS = ( TimePeriods => [qw(GetTimePeriod LastMonth SplitPeriod |
| | 48 | ListMonth)], |
| | 49 | Output => [qw(OutputData FormatOutput)], |
| | 50 | SQLHelper => [qw(SQLHierarchies SQLSortOrder SQLGroupList |
| | 51 | SQLSetBounds SQLBuildClause GetMaxLength)]); |
| | 52 | $VERSION = '0.01'; |
| | 53 | our $PackageVersion = '0.01'; |
| | 54 | |
| | 55 | use Data::Dumper; |
| | 56 | use File::Basename; |
| | 57 | |
| | 58 | use Config::Auto; |
| | 59 | use DBI; |
| | 60 | |
| | 61 | #####-------------------------------- Vars --------------------------------##### |
| | 62 | |
| | 63 | # trim the path |
| | 64 | our $FullPath = $0; |
| | 65 | our $HomePath = dirname($0); |
| | 66 | $0 =~ s%.*/%%; |
| | 67 | # set version string |
| | 68 | our $MyVersion = "$0 $::VERSION (NewsStats.pm $VERSION)"; |
| | 69 | |
| | 70 | #####------------------------------- Basics -------------------------------##### |
| | 71 | |
| | 72 | ################################################################################ |
| | 73 | |
| | 74 | ################################################################################ |
| | 75 | sub ShowVersion { |
| | 76 | ################################################################################ |
| | 77 | ### display version and exit |
| | 78 | print "NewsStats v$PackageVersion\n$MyVersion\n"; |
| | 79 | print "Copyright (c) 2010-2012 Thomas Hochstein <thh\@inter.net>\n"; |
| | 80 | print "This program is free software; you may redistribute it ". |
| | 81 | "and/or modify it under the same terms as Perl itself.\n"; |
| | 82 | exit(100); |
| | 83 | }; |
| | 84 | ################################################################################ |
| | 85 | |
| | 86 | ################################################################################ |
| | 87 | sub ShowPOD { |
| | 88 | ################################################################################ |
| | 89 | ### feed myself to perldoc and exit |
| | 90 | exec('perldoc', $FullPath); |
| | 91 | exit(100); |
| | 92 | }; |
| | 93 | ################################################################################ |
| | 94 | |
| | 95 | ################################################################################ |
| | 96 | sub ReadConfig { |
| | 97 | ################################################################################ |
| | 98 | ### read config via Config::Auto |
| | 99 | ### IN : $ConfFile: config filename |
| | 100 | ### OUT: reference to a hash containing the configuration |
| | 101 | my ($ConfFile) = @_; |
| | 102 | return Config::Auto::parse($ConfFile, format => 'equal'); |
| | 103 | }; |
| | 104 | ################################################################################ |
| | 105 | |
| | 106 | ################################################################################ |
| | 107 | sub OverrideConfig { |
| | 108 | ################################################################################ |
| | 109 | ### override configuration values |
| | 110 | ### IN : $ConfigR : reference to configuration hash |
| | 111 | ### $OverrideR: reference to a hash containing overrides |
| | 112 | my ($ConfigR,$OverrideR) = @_; |
| | 113 | my %Override = %$OverrideR; |
| | 114 | # Config hash empty? |
| | 115 | &Bleat(1,"Empty configuration hash passed to OverrideConfig()") |
| | 116 | if ( keys %$ConfigR < 1); |
| | 117 | # return if no overrides |
| | 118 | return if (keys %Override < 1 or keys %$ConfigR < 1); |
| | 119 | foreach my $Key (keys %Override) { |
| | 120 | $$ConfigR{$Key} = $Override{$Key}; |
| | 121 | }; |
| | 122 | }; |
| | 123 | ################################################################################ |
| | 124 | |
| | 125 | ################################################################################ |
| | 126 | sub InitDB { |
| | 127 | ################################################################################ |
| | 128 | ### initialise database connection |
| | 129 | ### IN : $ConfigR: reference to configuration hash |
| | 130 | ### $Die : if TRUE, die if connection fails |
| | 131 | ### OUT: DBHandle |
| | 132 | my ($ConfigR,$Die) = @_; |
| | 133 | my %Conf = %$ConfigR; |
| | 134 | my $DBHandle = DBI->connect(sprintf('DBI:%s:database=%s;host=%s', |
| | 135 | $Conf{'DBDriver'},$Conf{'DBDatabase'}, |
| | 136 | $Conf{'DBHost'}), $Conf{'DBUser'}, |
| | 137 | $Conf{'DBPw'}, { PrintError => 0 }); |
| | 138 | if (!$DBHandle) { |
| | 139 | &Bleat(2,$DBI::errstr) if (defined($Die) and $Die); |
| | 140 | &Bleat(1,$DBI::errstr); |
| | 141 | }; |
| | 142 | return $DBHandle; |
| | 143 | }; |
| | 144 | ################################################################################ |
| | 145 | |
| | 146 | ################################################################################ |
| | 147 | sub Bleat { |
| | 148 | ################################################################################ |
| | 149 | ### print warning or error messages and terminate in case of error |
| | 150 | ### IN : $Level : 1 = warning, 2 = error |
| | 151 | ### $Message: warning or error message |
| | 152 | my ($Level,$Message) = @_; |
| | 153 | if ($Level == 1) { |
| | 154 | warn "$0 W: $Message\n" |
| | 155 | } elsif ($Level == 2) { |
| | 156 | die "$0 E: $Message\n" |
| | 157 | } else { |
| | 158 | print "$0: $Message\n" |
| | 159 | } |
| | 160 | }; |
| | 161 | ################################################################################ |
| | 162 | |
| | 163 | #####------------------------------ GetStats ------------------------------##### |
| | 164 | |
| | 165 | ################################################################################ |
| | 166 | sub ListNewsgroups { |
| | 167 | ################################################################################ |
| | 168 | ### explode a (scalar) list of newsgroup names to a list of newsgroup and |
| | 169 | ### hierarchy names where every newsgroup and hierarchy appears only once: |
| | 170 | ### de.alt.test,de.alt.admin -> de.ALL, de.alt.ALL, de.alt.test, de.alt.admin |
| | 171 | ### IN : $Newsgroups : a list of newsgroups (content of Newsgroups: header) |
| | 172 | ### $TLH : top level hierarchy (all other newsgroups are ignored) |
| | 173 | ### $ValidGroupsR: reference to a hash containing all valid newsgroups |
| | 174 | ### as keys |
| | 175 | ### OUT: %Newsgroups : hash containing all newsgroup and hierarchy names as keys |
| | 176 | my ($Newsgroups,$TLH,$ValidGroupsR) = @_; |
| | 177 | my %ValidGroups = %{$ValidGroupsR} if $ValidGroupsR; |
| | 178 | my %Newsgroups; |
| | 179 | chomp($Newsgroups); |
| | 180 | # remove whitespace from contents of Newsgroups: |
| | 181 | $Newsgroups =~ s/\s//; |
| | 182 | # call &HierarchyCount for each newsgroup in $Newsgroups: |
| | 183 | for (split /,/, $Newsgroups) { |
| | 184 | # don't count newsgroup/hierarchy in wrong TLH |
| | 185 | next if($TLH and !/^$TLH/); |
| | 186 | # don't count invalid newsgroups |
| | 187 | if(%ValidGroups and !defined($ValidGroups{$_})) { |
| | 188 | warn (sprintf("DROPPED: %s\n",$_)); |
| | 189 | next; |
| | 190 | } |
| | 191 | # add original newsgroup to %Newsgroups |
| | 192 | $Newsgroups{$_} = 1; |
| | 193 | # add all hierarchy elements to %Newsgroups, amended by '.ALL', |
| | 194 | # i.e. de.alt.ALL and de.ALL |
| | 195 | foreach (ParseHierarchies($_)) { |
| | 196 | $Newsgroups{$_.'.ALL'} = 1; |
| | 197 | } |
| | 198 | }; |
| | 199 | return %Newsgroups; |
| | 200 | }; |
| | 201 | |
| | 202 | ################################################################################ |
| | 203 | sub ParseHierarchies { |
| | 204 | ################################################################################ |
| | 205 | ### return a list of all hierarchy levels a newsgroup belongs to |
| | 206 | ### (for de.alt.test.moderated that would be de/de.alt/de.alt.test) |
| | 207 | ### IN : $Newsgroup : a newsgroup name |
| | 208 | ### OUT: @Hierarchies: array containing all hierarchies the newsgroup belongs to |
| | 209 | my ($Newsgroup) = @_; |
| | 210 | my @Hierarchies; |
| | 211 | # strip trailing dots |
| | 212 | $Newsgroup =~ s/(.+)\.+$/$1/; |
| | 213 | # butcher newsgroup name by "." and add each hierarchy to @Hierarchies |
| | 214 | # i.e. de.alt.test: "de.alt" and "de" |
| | 215 | while ($Newsgroup =~ /\./) { |
| | 216 | $Newsgroup =~ s/^((?:\.?[^.]+)*)\.[^.]+$/$1/; |
| | 217 | push @Hierarchies, $Newsgroup; |
| | 218 | }; |
| | 219 | return @Hierarchies; |
| | 220 | }; |
| | 221 | |
| | 222 | ################################################################################ |
| | 223 | sub ReadGroupList { |
| | 224 | ################################################################################ |
| | 225 | ### read a list of valid newsgroups from file (each group on one line, |
| | 226 | ### ignoring everything after the first whitespace and so accepting files |
| | 227 | ### in checkgroups format as well as (parts of) an INN active file) |
| | 228 | ### IN : $Filename : file to read |
| | 229 | ### OUT: \%ValidGroups: hash containing all valid newsgroups |
| | 230 | my ($Filename) = @_; |
| | 231 | my %ValidGroups; |
| | 232 | open (my $LIST,"<$Filename") or &Bleat(2,"Cannot read $Filename: $!"); |
| | 233 | while (<$LIST>) { |
| | 234 | s/^\s*(\S+).*$/$1/; |
| | 235 | chomp; |
| | 236 | next if /^$/; |
| | 237 | $ValidGroups{$_} = '1'; |
| | 238 | }; |
| | 239 | close $LIST; |
| | 240 | return \%ValidGroups; |
| | 241 | }; |
| | 242 | |
| | 243 | ################################################################################ |
| | 244 | |
| | 245 | #####----------------------------- TimePeriods ----------------------------##### |
| | 246 | |
| | 247 | ################################################################################ |
| | 248 | sub GetTimePeriod { |
| | 249 | ################################################################################ |
| | 250 | ### get a time period to act on from --month option; |
| | 251 | ### if empty, default to last month |
| | 252 | ### IN : $Month: may be empty, 'YYYY-MM', 'YYYY-MM:YYYY-MM' or 'all' |
| | 253 | ### OUT: $Verbal,$SQL: verbal description and WHERE-clause |
| | 254 | ### of the chosen time period |
| | 255 | my ($Month) = @_; |
| | 256 | # define result variables |
| | 257 | my ($Verbal, $SQL); |
| | 258 | # define a regular expression for a month |
| | 259 | my $REMonth = '\d{4}-\d{2}'; |
| | 260 | |
| | 261 | # default to last month if option is not set |
| | 262 | if(!$Month) { |
| | 263 | $Month = &LastMonth; |
| | 264 | } |
| | 265 | |
| | 266 | # check for valid input |
| | 267 | if ($Month =~ /^$REMonth$/) { |
| | 268 | # single month (YYYY-MM) |
| | 269 | ($Month) = &CheckMonth($Month); |
| | 270 | $Verbal = $Month; |
| | 271 | $SQL = sprintf("month = '%s'",$Month); |
| | 272 | } elsif ($Month =~ /^$REMonth:$REMonth$/) { |
| | 273 | # time period (YYYY-MM:YYYY-MM) |
| | 274 | $Verbal = sprintf('%s to %s',&SplitPeriod($Month)); |
| | 275 | $SQL = sprintf("month BETWEEN '%s' AND '%s'",&SplitPeriod($Month)); |
| | 276 | } elsif ($Month =~ /^all$/i) { |
| | 277 | # special case: ALL |
| | 278 | $Verbal = 'all time'; |
| | 279 | $SQL = ''; |
| | 280 | } else { |
| | 281 | # invalid input |
| | 282 | return (undef,undef); |
| | 283 | } |
| | 284 | |
| | 285 | return ($Verbal,$SQL); |
| | 286 | }; |
| | 287 | |
| | 288 | ################################################################################ |
| | 289 | sub LastMonth { |
| | 290 | ################################################################################ |
| | 291 | ### get last month from todays date in YYYY-MM format |
| | 292 | ### OUT: last month as YYYY-MM |
| | 293 | # get today's date |
| | 294 | my (undef,undef,undef,undef,$Month,$Year,undef,undef,undef) = localtime(time); |
| | 295 | # $Month is already defined from 0 to 11, so no need to decrease it by 1 |
| | 296 | $Year += 1900; |
| | 297 | if ($Month < 1) { |
| | 298 | $Month = 12; |
| | 299 | $Year--; |
| | 300 | }; |
| | 301 | # return last month |
| | 302 | return sprintf('%4d-%02d',$Year,$Month); |
| | 303 | }; |
| | 304 | |
| | 305 | ################################################################################ |
| | 306 | sub CheckMonth { |
| | 307 | ################################################################################ |
| | 308 | ### check if input (in YYYY-MM form) is valid with MM between 01 and 12; |
| | 309 | ### otherwise, fix it |
| | 310 | ### IN : @Month: array of month |
| | 311 | ### OUT: @Month: a valid month |
| | 312 | my (@Month) = @_; |
| | 313 | foreach my $Month (@Month) { |
| | 314 | my ($OldMonth) = $Month; |
| | 315 | my ($CalMonth) = substr ($Month, -2); |
| | 316 | if ($CalMonth < 1 or $CalMonth > 12) { |
| | 317 | $CalMonth = '12' if $CalMonth > 12; |
| | 318 | $CalMonth = '01' if $CalMonth < 1; |
| | 319 | substr($Month, -2) = $CalMonth; |
| | 320 | &Bleat(1,sprintf("'%s' is an invalid date (MM must be between '01' ". |
| | 321 | "and '12'), set to '%s'.",$OldMonth,$Month)); |
| | 322 | } |
| | 323 | } |
| | 324 | return @Month; |
| | 325 | }; |
| | 326 | |
| | 327 | ################################################################################ |
| | 328 | sub SplitPeriod { |
| | 329 | ################################################################################ |
| | 330 | ### split a time period denoted by YYYY-MM:YYYY-MM into start and end month |
| | 331 | ### IN : $Period: time period |
| | 332 | ### OUT: $StartMonth, $EndMonth |
| | 333 | my ($Period) = @_; |
| | 334 | my ($StartMonth, $EndMonth) = split /:/, $Period; |
| | 335 | ($StartMonth,$EndMonth) = CheckMonth($StartMonth,$EndMonth); |
| | 336 | # switch parameters as necessary |
| | 337 | if ($EndMonth gt $StartMonth) { |
| | 338 | return ($StartMonth, $EndMonth); |
| | 339 | } else { |
| | 340 | return ($EndMonth, $StartMonth); |
| | 341 | }; |
| | 342 | }; |
| | 343 | |
| | 344 | ################################################################################ |
| | 345 | sub ListMonth { |
| | 346 | ################################################################################ |
| | 347 | ### return a list of months (YYYY-MM) between start and end month |
| | 348 | ### IN : $MonthExpression ('YYYY-MM' or 'YYYY-MM to YYYY-MM') |
| | 349 | ### OUT: @Months: array containing all months from $MonthExpression enumerated |
| | 350 | my ($MonthExpression )= @_; |
| | 351 | # return if single month |
| | 352 | return ($MonthExpression) if ($MonthExpression =~ /^\d{4}-\d{2}$/); |
| | 353 | # parse $MonthExpression |
| | 354 | my ($StartMonth, $EndMonth) = split(' to ',$MonthExpression); |
| | 355 | # set $Year, $Month from $StartMonth |
| | 356 | my ($Year, $Month) = split /-/, $StartMonth; |
| | 357 | # define @Months |
| | 358 | my (@Months); |
| | 359 | until ("$Year-$Month" gt $EndMonth) { |
| | 360 | push @Months, "$Year-$Month"; |
| | 361 | $Month = "$Month"; # force string context |
| | 362 | $Month++; |
| | 363 | if ($Month > 12) { |
| | 364 | $Month = '01'; |
| | 365 | $Year++; |
| | 366 | }; |
| | 367 | }; |
| | 368 | return @Months; |
| | 369 | }; |
| | 370 | |
| | 371 | #####---------------------------- OutputFormats ---------------------------##### |
| | 372 | |
| | 373 | ################################################################################ |
| | 374 | sub OutputData { |
| | 375 | ################################################################################ |
| | 376 | ### read database query results from DBHandle and print results with formatting |
| | 377 | ### IN : $Format : format specifier |
| | 378 | ### $Comments : print or suppress all comments for machine-readable output |
| | 379 | ### $GroupBy : primary sorting order (month or key) |
| | 380 | ### $Precision: number of digits right of decimal point (0 or 2) |
| | 381 | ### $ValidKeys: reference to a hash containing all valid keys |
| | 382 | ### $FileTempl: file name template (--filetemplate): filetempl-YYYY-MM |
| | 383 | ### $DBQuery : database query handle with executed query, |
| | 384 | ### containing $Month, $Key, $Value |
| | 385 | ### $PadGroup : padding length for key field (optional) for 'pretty' |
| | 386 | my ($Format, $Comments, $GroupBy, $Precision, $ValidKeys, $FileTempl, |
| | 387 | $DBQuery, $PadGroup) = @_; |
| | 388 | my %ValidKeys = %{$ValidKeys} if $ValidKeys; |
| | 389 | my ($FileName, $Handle, $OUT); |
| | 390 | our $LastIteration; |
| | 391 | |
| | 392 | # define output types |
| | 393 | my %LegalOutput; |
| | 394 | @LegalOutput{('dump',,'list','pretty')} = (); |
| | 395 | # bail out if format is unknown |
| | 396 | &Bleat(2,"Unknown output type '$Format'!") if !exists($LegalOutput{$Format}); |
| | 397 | |
| | 398 | while (my ($Month, $Key, $Value) = $DBQuery->fetchrow_array) { |
| | 399 | # don't display invalid keys |
| | 400 | if(%ValidKeys and !defined($ValidKeys{$Key})) { |
| | 401 | # FIXME |
| | 402 | # &Bleat(1,sprintf("DROPPED: %s",$Key)); |
| | 403 | next; |
| | 404 | }; |
| | 405 | # care for correct sorting order and abstract from month and keys: |
| | 406 | # $Caption will be $Month or $Key, according to sorting order, |
| | 407 | # and $Key will be $Key or $Month, respectively |
| | 408 | my $Caption; |
| | 409 | if ($GroupBy eq 'key') { |
| | 410 | $Caption = $Key; |
| | 411 | $Key = $Month; |
| | 412 | } else { |
| | 413 | $Caption = $Month; |
| | 414 | } |
| | 415 | # set output file handle |
| | 416 | if (!$FileTempl) { |
| | 417 | $Handle = *STDOUT{IO}; # set $Handle to a reference to STDOUT |
| | 418 | } elsif (!defined($LastIteration) or $LastIteration ne $Caption) { |
| | 419 | close $OUT if ($LastIteration); |
| | 420 | # safeguards for filename creation: |
| | 421 | # replace potential problem characters with '_' |
| | 422 | $FileName = sprintf('%s-%s',$FileTempl,$Caption); |
| | 423 | $FileName =~ s/[^a-zA-Z0-9_-]+/_/g; |
| | 424 | open ($OUT,">$FileName") |
| | 425 | or &Bleat(2,sprintf("Cannot open output file '%s': $!", |
| | 426 | $FileName)); |
| | 427 | $Handle = $OUT; |
| | 428 | }; |
| | 429 | print $Handle &FormatOutput($Format, $Comments, $Caption, $Key, $Value, |
| | 430 | $Precision, $PadGroup); |
| | 431 | $LastIteration = $Caption; |
| | 432 | }; |
| | 433 | close $OUT if ($FileTempl); |
| | 434 | }; |
| | 435 | |
| | 436 | ################################################################################ |
| | 437 | sub FormatOutput { |
| | 438 | ################################################################################ |
| | 439 | ### format information for output according to format specifier |
| | 440 | ### IN : $Format : format specifier |
| | 441 | ### $Comments : print or suppress all comments for machine-readable output |
| | 442 | ### $Caption : month (as YYYY-MM) or $Key, according to sorting order |
| | 443 | ### $Key : newsgroup, client, ... or $Month, as above |
| | 444 | ### $Value : number of postings with that attribute |
| | 445 | ### $Precision: number of digits right of decimal point (0 or 2) |
| | 446 | ### $PadGroup : padding length for key field (optional) for 'pretty' |
| | 447 | ### OUT: $Output: formatted output |
| | 448 | my ($Format, $Comments, $Caption, $Key, $Value, $Precision, $PadGroup) = @_; |
| | 449 | my ($Output); |
| | 450 | # keep last caption in mind |
| | 451 | our ($LastIteration); |
| | 452 | # create one line of output |
| | 453 | if ($Format eq 'dump') { |
| | 454 | # output as dump (key value) |
| | 455 | $Output = sprintf ("# %s:\n",$Caption) |
| | 456 | if ($Comments and (!defined($LastIteration) or $Caption ne $LastIteration)); |
| | 457 | $Output .= sprintf ("%s %u\n",$Key,$Value); |
| | 458 | } elsif ($Format eq 'list') { |
| | 459 | # output as list (caption key value) |
| | 460 | $Output = sprintf ("%s %s %u\n",$Caption,$Key,$Value); |
| | 461 | } elsif ($Format eq 'pretty') { |
| | 462 | # output as a table |
| | 463 | $Output = sprintf ("# ----- %s:\n",$Caption) |
| | 464 | if ($Comments and (!defined($LastIteration) or $Caption ne $LastIteration)); |
| | 465 | $Output .= sprintf ($PadGroup ? sprintf("%%-%us %%10.*f\n",$PadGroup) : |
| | 466 | "%s %.*f\n",$Key,$Precision,$Value); |
| | 467 | }; |
| | 468 | return $Output; |
| | 469 | }; |
| | 470 | |
| | 471 | #####------------------------- QueryModifications -------------------------##### |
| | 472 | |
| | 473 | ################################################################################ |
| | 474 | sub SQLHierarchies { |
| | 475 | ################################################################################ |
| | 476 | ### add exclusion of hierarchy levels (de.alt.ALL) from SQL query by |
| | 477 | ### amending the WHERE clause if $ShowHierarchies is false (or don't, if it is |
| | 478 | ### true, accordingly) |
| | 479 | ### IN : $ShowHierarchies: boolean value |
| | 480 | ### OUT: SQL code |
| | 481 | my ($ShowHierarchies) = @_; |
| | 482 | return $ShowHierarchies ? '' : "newsgroup NOT LIKE '%.ALL'"; |
| | 483 | }; |
| | 484 | |
| | 485 | ################################################################################ |
| | 486 | sub GetMaxLength { |
| | 487 | ################################################################################ |
| | 488 | ### get length of longest field in future query result |
| | 489 | ### IN : $DBHandle : database handel |
| | 490 | ### $Table : table to query |
| | 491 | ### $Field : field to check |
| | 492 | ### $WhereClause : WHERE clause |
| | 493 | ### $HavingClause: HAVING clause |
| | 494 | ### @BindVars : bind variables for WHERE clause |
| | 495 | ### OUT: $Length: length of longest instnace of $Field |
| | 496 | my ($DBHandle,$Table,$Field,$WhereClause,$HavingClause,@BindVars) = @_; |
| | 497 | my $DBQuery = $DBHandle->prepare(sprintf("SELECT MAX(LENGTH(%s)) ". |
| | 498 | "FROM %s %s %s",$Field,$Table, |
| | 499 | $WhereClause,$HavingClause ? |
| | 500 | 'GROUP BY newsgroup' . $HavingClause . |
| | 501 | ' ORDER BY LENGTH(newsgroup) '. |
| | 502 | 'DESC LIMIT 1': '')); |
| | 503 | $DBQuery->execute(@BindVars) or &Bleat(1,sprintf("Can't get field length ". |
| | 504 | "for '%s' from table '%s': ". |
| | 505 | "$DBI::errstr",$Field,$Table)); |
| | 506 | my ($Length) = $DBQuery->fetchrow_array; |
| | 507 | return $Length; |
| | 508 | }; |
| | 509 | |
| | 510 | ################################################################################ |
| | 511 | sub SQLSortOrder { |
| | 512 | ################################################################################ |
| | 513 | ### build a SQL 'ORDER BY' clause from $OptGroupBy (primary sorting) and |
| | 514 | ### $OptOrderBy (secondary sorting), both ascending or descending; |
| | 515 | ### descending sorting order is done by adding '-desc' |
| | 516 | ### IN : $GroupBy: primary sort by 'month' (default) or 'newsgroups' |
| | 517 | ### $OrderBy: secondary sort by month/newsgroups (default) |
| | 518 | ### or number of 'postings' |
| | 519 | ### OUT: a SQL ORDER BY clause |
| | 520 | my ($GroupBy,$OrderBy) = @_; |
| | 521 | my ($GroupSort,$OrderSort) = ('',''); |
| | 522 | # $GroupBy (primary sorting) |
| | 523 | if (!$GroupBy) { |
| | 524 | $GroupBy = 'month'; |
| | 525 | } else { |
| | 526 | ($GroupBy, $GroupSort) = SQLParseOrder($GroupBy); |
| | 527 | if ($GroupBy =~ /group/i) { |
| | 528 | $GroupBy = 'newsgroup'; |
| | 529 | } else { |
| | 530 | $GroupBy = 'month'; |
| | 531 | } |
| | 532 | } |
| | 533 | my $Secondary = ($GroupBy eq 'month') ? 'newsgroup' : 'month'; |
| | 534 | # $OrderBy (secondary sorting) |
| | 535 | if (!$OrderBy) { |
| | 536 | $OrderBy = $Secondary; |
| | 537 | } else { |
| | 538 | ($OrderBy, $OrderSort) = SQLParseOrder($OrderBy); |
| | 539 | if ($OrderBy =~ /posting/i) { |
| | 540 | $OrderBy = "postings $OrderSort, $Secondary"; |
| | 541 | } else { |
| | 542 | $OrderBy = "$Secondary $OrderSort"; |
| | 543 | } |
| | 544 | } |
| | 545 | return ($GroupBy,&SQLBuildClause('order',"$GroupBy $GroupSort",$OrderBy)); |
| | 546 | }; |
| | 547 | |
| | 548 | ################################################################################ |
| | 549 | sub SQLParseOrder { |
| | 550 | ################################################################################ |
| | 551 | ### parse $OptGroupBy or $OptOrderBy option of the form param[-desc], e.g. |
| | 552 | ### 'month', 'month-desc', 'newsgroups-desc', but also just 'desc' |
| | 553 | ### IN : $OrderOption: order option (see above) |
| | 554 | ### OUT: parameter to sort by, |
| | 555 | ### sort order ('DESC' or nothing, meaning 'ASC') |
| | 556 | my ($OrderOption) = @_; |
| | 557 | my $SortOrder = ''; |
| | 558 | if ($OrderOption =~ s/-?desc$//i) { |
| | 559 | $SortOrder = 'DESC'; |
| | 560 | } else { |
| | 561 | $OrderOption =~ s/-?asc$//i |
| | 562 | } |
| | 563 | return ($OrderOption,$SortOrder); |
| | 564 | }; |
| | 565 | |
| | 566 | ################################################################################ |
| | 567 | sub SQLGroupList { |
| | 568 | ################################################################################ |
| | 569 | ### explode list of newsgroups separated by : (with wildcards) |
| | 570 | ### to a SQL 'WHERE' expression |
| | 571 | ### IN : $Newsgroups: list of newsgroups (group.one.*:group.two:group.three.*) |
| | 572 | ### OUT: SQL code to become part of a 'WHERE' clause, |
| | 573 | ### list of newsgroups for SQL bindings |
| | 574 | my ($Newsgroups) = @_; |
| | 575 | # substitute '*' wildcard with SQL wildcard character '%' |
| | 576 | $Newsgroups =~ s/\*/%/g; |
| | 577 | # just one newsgroup? |
| | 578 | return (SQLGroupWildcard($Newsgroups),$Newsgroups) if $Newsgroups !~ /:/; |
| | 579 | # list of newsgroups separated by ':' |
| | 580 | my $SQL = '('; |
| | 581 | my @GroupList = split /:/, $Newsgroups; |
| | 582 | foreach (@GroupList) { |
| | 583 | $SQL .= ' OR ' if $SQL gt '('; |
| | 584 | $SQL .= SQLGroupWildcard($_); |
| | 585 | }; |
| | 586 | $SQL .= ')'; |
| | 587 | return ($SQL,@GroupList); |
| | 588 | }; |
| | 589 | |
| | 590 | ################################################################################ |
| | 591 | sub SQLGroupWildcard { |
| | 592 | ################################################################################ |
| | 593 | ### build a valid SQL 'WHERE' expression with or without wildcards |
| | 594 | ### IN : $Newsgroup: newsgroup expression, probably with wildcard |
| | 595 | ### (group.name or group.name.%) |
| | 596 | ### OUT: SQL code to become part of a 'WHERE' clause |
| | 597 | my ($Newsgroup) = @_; |
| | 598 | # FIXME: check for validity |
| | 599 | if ($Newsgroup !~ /%/) { |
| | 600 | return 'newsgroup = ?'; |
| | 601 | } else { |
| | 602 | return 'newsgroup LIKE ?'; |
| | 603 | } |
| | 604 | }; |
| | 605 | |
| | 606 | ################################################################################ |
| | 607 | sub SQLSetBounds { |
| | 608 | ################################################################################ |
| | 609 | ### set upper and/or lower boundary (number of postings) |
| | 610 | ### IN : $Type: 'level', 'average', 'sum' or 'default' |
| | 611 | ### $LowBound,$UppBound: lower/upper boundary, respectively |
| | 612 | ### OUT: SQL code to become part of a WHERE or HAVING clause |
| | 613 | my ($Type,$LowBound,$UppBound) = @_; |
| | 614 | ($LowBound,$UppBound) = SQLCheckNumber($LowBound,$UppBound); |
| | 615 | if($LowBound and $UppBound and $LowBound > $UppBound) { |
| | 616 | &Bleat(1,"Lower boundary $LowBound is larger than Upper boundary ". |
| | 617 | "$UppBound, exchanging boundaries."); |
| | 618 | ($LowBound,$UppBound) = ($UppBound,$LowBound); |
| | 619 | } |
| | 620 | # default to 'default' |
| | 621 | my $WhereHavingFunction = 'postings'; |
| | 622 | # set $LowBound to SQL statement: |
| | 623 | # 'WHERE postings >=', 'HAVING MIN(postings) >=' or 'HAVING AVG(postings) >=' |
| | 624 | if ($Type eq 'level') { |
| | 625 | $WhereHavingFunction = 'MIN(postings)' |
| | 626 | } elsif ($Type eq 'average') { |
| | 627 | $WhereHavingFunction = 'AVG(postings)' |
| | 628 | } elsif ($Type eq 'sum') { |
| | 629 | $WhereHavingFunction = 'SUM(postings)' |
| | 630 | } |
| | 631 | $LowBound = sprintf('%s >= '.$LowBound,$WhereHavingFunction) if ($LowBound); |
| | 632 | # set $LowBound to SQL statement: |
| | 633 | # 'WHERE postings <=', 'HAVING MAX(postings) <=' or 'HAVING AVG(postings) <=' |
| | 634 | if ($Type eq 'level') { |
| | 635 | $WhereHavingFunction = 'MAX(postings)' |
| | 636 | } elsif ($Type eq 'average') { |
| | 637 | $WhereHavingFunction = 'AVG(postings)' |
| | 638 | } elsif ($Type eq 'sum') { |
| | 639 | $WhereHavingFunction = 'SUM(postings)' |
| | 640 | } |
| | 641 | $UppBound = sprintf('%s <= '.$UppBound,$WhereHavingFunction) if ($UppBound); |
| | 642 | return ($LowBound,$UppBound); |
| | 643 | }; |
| | 644 | |
| | 645 | ################################################################################ |
| | 646 | sub SQLCheckNumber { |
| | 647 | ################################################################################ |
| | 648 | ### check if input is a valid positive integer; otherwise, make it one |
| | 649 | ### IN : @Numbers: array of parameters |
| | 650 | ### OUT: @Numbers: a valid positive integer |
| | 651 | my (@Numbers) = @_; |
| | 652 | foreach my $Number (@Numbers) { |
| | 653 | if ($Number and $Number < 0) { |
| | 654 | &Bleat(1,"Boundary $Number is < 0, set to ".-$Number); |
| | 655 | $Number = -$Number; |
| | 656 | } |
| | 657 | $Number = '' if ($Number and $Number !~ /^\d+$/); |
| | 658 | } |
| | 659 | return @Numbers; |
| | 660 | }; |
| | 661 | |
| | 662 | ################################################################################ |
| | 663 | sub SQLBuildClause { |
| | 664 | ################################################################################ |
| | 665 | ### build a valid SQL WHERE, GROUP BY, ORDER BY or HAVING clause |
| | 666 | ### from multiple expressions which *may* be empty |
| | 667 | ### IN : $Type: 'where', 'having', 'group' or 'order' |
| | 668 | ### @Expressions: array of expressions |
| | 669 | ### OUT: $SQLClause: a SQL clause |
| | 670 | my ($Type,@Expressions) = @_; |
| | 671 | my ($SQLClause,$Separator,$Statement); |
| | 672 | # set separator ('AND' or ',') |
| | 673 | if ($Type eq 'where' or $Type eq 'having') { |
| | 674 | $Separator = 'AND'; |
| | 675 | } else { |
| | 676 | $Separator = ','; |
| | 677 | } |
| | 678 | # set statement |
| | 679 | if ($Type eq 'where') { |
| | 680 | $Statement = 'WHERE'; |
| | 681 | } elsif ($Type eq 'order') { |
| | 682 | $Statement = 'ORDER BY'; |
| | 683 | } elsif ($Type eq 'having') { |
| | 684 | $Statement = 'HAVING'; |
| | 685 | } else { |
| | 686 | $Statement = 'GROUP BY'; |
| | 687 | } |
| | 688 | # build query from expressions with separators |
| | 689 | foreach my $Expression (@Expressions) { |
| | 690 | if ($Expression) { |
| | 691 | $SQLClause .= " $Separator " if ($SQLClause); |
| | 692 | $SQLClause .= $Expression; |
| | 693 | } |
| | 694 | } |
| | 695 | # add statement in front if not already present |
| | 696 | $SQLClause = " $Statement " . $SQLClause |
| | 697 | if ($SQLClause and $SQLClause !~ /$Statement/); |
| | 698 | return $SQLClause; |
| | 699 | }; |
| | 700 | |
| | 701 | |
| | 702 | #####------------------------------- done ---------------------------------##### |
| | 703 | 1; |
| | 704 | |
| | 705 | |
projects / usenet / newsstats.git / blame_incremental