Beginning Web Development With Perl : From Novice to ... - Nabo

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CHAPTER 13 ■ PERL WEB SITES WITH MASON 269I’ve also had to bring some legacy CGI scripts over to the site. In doing so, I found thatI needed to set the MasonArgsMethod to CGI, away from its default of mod_perl. I suspect (orhope) that I’ll have time to port these scripts to mod_perl by the time you’re reading this book.In addition to that basic configuration, I’ve also tightened the security for the site bysending a “404: Not Found” error whenever someone tries to access one of the Mason-specificcomponents that I might or might not use. I accomplish this with the help of a directive and Apache::Constants::NOT_FOUND, as directed by the perldoc for HTML::Mason::Admin.Here is the full configuration for Mason as it appears in my httpd.conf. Your configurationmay vary from this, but my hope is to pass along some practical information about a real-worldimplementation of Mason.PerlModule HTML::Mason::ApacheHandlerSetHandler perl-scriptPerlHandler HTML::Mason::ApacheHandlerPerlSetVar MasonCompRoot /home/suehring/wwwPerlSetVar MasonDataDir /home/suehring/mason#sws 5/27/2005PerlSetVar MasonArgsMethod CGISetHandler perl-scriptPerlInitHandler Apache::Constants::NOT_FOUNDWith the appropriate configuration for your Apache installation in place, you can restartthe Apache server.Mason SyntaxIt’s time to create a “Hello World” example, Mason-style. In general, I’m fed up with “HelloWorld” examples, though, so I’m going to create something even more annoying: a page thatuses the HTML tag. I’ll do this by wrapping the output inside of a block in thepage. Listing 13-1 shows the simple text for this page.Listing 13-1. A Mason-Style Page Using to Print a Blinking Tag print "This is the blinkin' example.\n"; The page can be saved within the directory you configured as the MasonCompRoot andviewed in a web browser. When I viewed the page, I saw blinking text. It’s difficult to illustrateblinking text in a screenshot, however, so Figure 13-2 shows the text when it appears.
270CHAPTER 13 ■ PERL WEB SITES WITH MASONFigure 13-2. The output from the tag exampleAs with any terse example of this nature, it only serves to show that your Mason installationis working and not much else. In addition, there are multiple ways to create the outputshown in Figure 13-2. I chose one of the more verbose ways to do it, since it provides a goodtransition into some of the less verbose methods shown later in this section.In this section, we’ll start off by examining components, and then we’ll move on to look atrequest objects, handlers, and subrequests.ComponentsAs mentioned previously, central to working with Mason is the component object. The MasonDeveloper’s Manual describes a component as “a mix of Perl and HTML” and the “basic buildingblock and computational unit.” A component can be a portion of a page that containsMason sections, or it can be an entire page, or it can be anything in between. Components cancall other components, passing information between them and the current request.The example shown in Listing 13-1 is itself a component. A slightly more complex exampleis shown in Listing 13-2.Listing 13-2. A Slightly More Complex Mason Example% my $time = time;The time is , thanks for visiting.The results of this example appear in Figure 13-3.
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Beginning Web Development with Perl
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PART 5 ■ ■ ■ Creating Web Tem
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■CONTENTSvii■CHAPTER 4 System I
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■CONTENTSixCreating a SOAP Listen
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■CONTENTSxiTemplate Toolkit Synta
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About the Author■STEVE SUEHRING i
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AcknowledgmentsThanks to James Lee
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xx■INTRODUCTIONThis book will use
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CHAPTER 1■ ■ ■The CGI ModuleT
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CHAPTER 1 ■ THE CGI MODULE 5for t
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CHAPTER 1 ■ THE CGI MODULE 7Obvio
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CHAPTER 1 ■ THE CGI MODULE 9exit;
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CHAPTER 1 ■ THE CGI MODULE 11Each
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CHAPTER 1 ■ THE CGI MODULE 13When
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CHAPTER 1 ■ THE CGI MODULE 15Upda
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CHAPTER 1 ■ THE CGI MODULE 17rese
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CHAPTER 1 ■ THE CGI MODULE 19prin
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CHAPTER 1 ■ THE CGI MODULE 21Sett
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CHAPTER 1 ■ THE CGI MODULE 23You
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CHAPTER 1 ■ THE CGI MODULE 25■C
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CHAPTER 1 ■ THE CGI MODULE 27No m
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CHAPTER 1 ■ THE CGI MODULE 29The
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CHAPTER 1 ■ THE CGI MODULE 31prin
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CHAPTER 1 ■ THE CGI MODULE 33Also
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CHAPTER 2■ ■ ■Popular CGI Mod
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CHAPTER 2 ■ POPULAR CGI MODULES 3
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50CHAPTER 3 ■ DATABASES AND PERLT
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52CHAPTER 3 ■ DATABASES AND PERLm
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54CHAPTER 3 ■ DATABASES AND PERLl
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56CHAPTER 3 ■ DATABASES AND PERLc
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58CHAPTER 3 ■ DATABASES AND PERLR
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62CHAPTER 3 ■ DATABASES AND PERLw
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64CHAPTER 3 ■ DATABASES AND PERLA
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74CHAPTER 4 ■ SYSTEM INTERACTION
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76CHAPTER 4 ■ SYSTEM INTERACTIONt
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78CHAPTER 4 ■ SYSTEM INTERACTIONc
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80CHAPTER 4 ■ SYSTEM INTERACTIONA
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82CHAPTER 4 ■ SYSTEM INTERACTIONm
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84CHAPTER 4 ■ SYSTEM INTERACTIONs
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86CHAPTER 4 ■ SYSTEM INTERACTIONr
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CHAPTER 5■ ■ ■LWP ModulesLWP
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CHAPTER 5 ■ LWP MODULES 91HTTP Re
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CHAPTER 5 ■ LWP MODULES 93Get Fun
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CHAPTER 5 ■ LWP MODULES 95When ca
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CHAPTER 5 ■ LWP MODULES 97These a
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CHAPTER 5 ■ LWP MODULES 99Recall
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CHAPTER 5 ■ LWP MODULES 101which
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CHAPTER 5 ■ LWP MODULES 103For th
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CHAPTER 5 ■ LWP MODULES 105Obviou
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108CHAPTER 6 ■ NET:: TOOLSCreatin
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110CHAPTER 6 ■ NET:: TOOLSThe out
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112CHAPTER 6 ■ NET:: TOOLSmy $pop
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114CHAPTER 6 ■ NET:: TOOLSthe POP
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116CHAPTER 6 ■ NET:: TOOLS($messa
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118CHAPTER 6 ■ NET:: TOOLSListing
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120CHAPTER 6 ■ NET:: TOOLSFor the
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122CHAPTER 6 ■ NET:: TOOLSNet::SM
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124CHAPTER 6 ■ NET:: TOOLS$smtpco
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126CHAPTER 6 ■ NET:: TOOLSuse Net
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128CHAPTER 6 ■ NET:: TOOLSListing
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130CHAPTER 6 ■ NET:: TOOLSFor exa
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132CHAPTER 6 ■ NET:: TOOLSSending
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PART 3■ ■ ■XML and RSS
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138CHAPTER 7 ■ SOAP-BASED WEB SER
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154CHAPTER 8 ■ PERL AND RSSFigure
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156CHAPTER 8 ■ PERL AND RSShttp:/
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158CHAPTER 8 ■ PERL AND RSSDebugg
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160CHAPTER 8 ■ PERL AND RSS$rsswr
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162CHAPTER 8 ■ PERL AND RSSListin
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CHAPTER 9■ ■ ■XML Parsing wit
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CHAPTER 9 ■ XML PARSING WITH PERL
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PART 4■ ■ ■PerformanceEnhance
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184CHAPTER 10 ■ APACHE AND MOD_PE
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202CHAPTER 11 ■ DEVELOPMENT WITH
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Page 292 and 293: 284APPENDIX ■ PERL BASICSKeywords
Page 294 and 295: 286APPENDIX ■ PERL BASICS$ perl n
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320APPENDIX ■ PERL BASICSOther Te
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322APPENDIX ■ PERL BASICS}}}actio
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324APPENDIX ■ PERL BASICSNotice t
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326APPENDIX ■ PERL BASICSLooping
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328APPENDIX ■ PERL BASICSuse stri
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330APPENDIX ■ PERL BASICSuntil ($
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332APPENDIX ■ PERL BASICSuse stri
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334APPENDIX ■ PERL BASICSdoneAll
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336APPENDIX ■ PERL BASICS$ perl r
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338APPENDIX ■ PERL BASICSSummaryT
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340■INDEXmethods for retrieving r
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342■INDEXdo() method for, 62dumpi
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344■INDEXhello option for Net::SM
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346■INDEXNet::DNS module, 125-128
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348■INDEXrecord with Net::DNS mod
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350■INDEXstoring mail server in e
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352■INDEXlogging based on, 229pri
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