Debugging: Rules And Tools - PHPTek 11 Version

DEBUGGINGR U L E S A N D TO O L Sian barber - http://phpir.com - @ianbarber

I did XI wanted YInstead I got Z

http://www.debuggingrules.com

RULE 1UNDERSTANDTHE SYSTEM

BugWiki Tracker Frame work RTFM PHP Docphp.net

$field = $document->getField($fieldName);if ($field->storeTermVector) { /** * @todo term vector storing support */ require_once Zend/Search/Lucene/Exception.php; throw new Zend_Search_Lucene_Exception (Store term vector functionality is not supported yet.);}

KomodoEclipse Zend Studio TOOLS PHP NetStorm Text Beans Mate

RULE 2MAKE ITFAIL

Recreate AndAutomatePHP UnitSimpleTestSeleniumPHP SlimJMeterAb

Time Load Timing UserServer CONTROL Env VARIABLES Request Client DB State Session

[root@localhost ~]# pear channel-discover pear.phpunit.de[root@localhost ~]# pear install phpunit/PHPUnitclass Test_User extends PHPUnit_Framework_TestCase { public function testUpdate() { $r = ("a", "b"); try { $u = User::fetch($this->newName); $result = $u->update($r); } catch (Id_Exception $e) { $this->fail($e->getMessage()); } $this->assertEquals($r, $u->getRoles()); }}

http://seleniumhq.org/

class Example extends PHPUnit_Extensions_SeleniumTestCase { protected function setUp() { $this->setBrowser("*chrome"); $this->setBrowserUrl("http://general.dev/"); } public function testMyTestCase() { $this->open("/"); $this->select("locale", "label=de"); $this->waitForPageToLoad("30000"); $this->assertTrue($this->isTextPresent( "Datenbank-Einrichtung")); }}

http://jakarta.apache.org/jmeter/

RULE 3QUIT THINKINGAND LOOK

if($this->hasRoles) { $this->deleteRoles();}try { foreach($submittedRoles as $role) { $this->addRole($role); }} catch(Identity_Exception $e) { $this->log->warn(Role add failed.); throw new Service_Exception_BadRequest( Cannot add user role);}

Instrumentation:Inspect or Report

Xdebug http://www.xdebug.org[root@localhost ~]# pecl install xdebugzend_extension=/usr/lib64/php/modules/xdebug.so

xdebug.profiler_enable=1xdebug.profiler_output_dir=/tmp

Web Server PHP ScriptDebugging Client XDebug Debugging Commands

xdebug.remote_enable=1xdebug.remote_port=9000xdebug.remote_mode=reqxdebug.remote_host=192.168.192.1 # xdebug.remote_connect_back=1

[root@localhost ~]# lsof -p 4365COMMAND USER FD TYPE DEVICE NAMEhttpd apache mem REG 253,0 /lib64/libssl.so.0.9.8ehttpd apache mem REG 253,0 /usr/lib64/php/modules/xdebug.sohttpd apache mem REG 253,0 /usr/lib64/libsqlite3.so.0.8.6[root@localhost ~]# strace -cp 4365Process 6910 attached - interrupt to quitProcess 6910 detached% time seconds usecs/call calls errors syscall------ ----------- ----------- --------- --------- ------------- 36.91 0.037307 466 80 getdents 30.07 0.030393 950 32 7 access 17.04 0.017224 154 112 10 open 5.08 0.005136 12 444 9 lstat 3.87 0.003910 18 213 1 read 3.04 0.003071 29 107 close 2.57 0.002598 1299 2 writev 0.78 0.000785 1 631 stat

[root@localhost ~]# strace -Tp 4365Process 6910 attached - interrupt to quitepoll_wait(16, {{EPOLLIN, {u32=31389672, u64=47128707528680}}}, 2, 10000) = 1 <6.926140>accept(4, {sa_family=AF_INET6, sin6_port=htons(64930), inet_pton (AF_INET6, "::ffff:192.168.192.1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [47128676139036]) = 17 <0.000094>fcntl(17, F_SETFL, O_RDWR|O_NONBLOCK) = 0 <0.000035>read(17, "POST / HTTP/1.1rnHost: general.d"..., 8000) = 522 <0.000044>stat("/mnt/hgfs/habari/htdocs/", {st_mode=S_IFDIR|0755, st_size=408, ...}) = 0 <0.000527>open("/mnt/hgfs/habari/htdocs/.htaccess", O_RDONLY) = 18 <0.000457>fcntl(17, F_SETFL, O_RDWR|O_NONBLOCK) = 0 <0.000037>

[root@localhost ~]# strace -Tp 4365Process 6910 attached - interrupt to quitepoll_wait(16, {{EPOLLIN, {u32=31389672, u64=47128707528680}}}, 2, 10000) = 1 <6.926140>accept(4, {sa_family=AF_INET6, sin6_port=htons(64930), inet_pton (AF_INET6, "::ffff:192.168.192.1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [47128676139036]) = 17 <0.000094>fcntl(17, F_SETFL, O_RDWR|O_NONBLOCK) = 0 <0.000035>read(17, "POST / HTTP/1.1rnHost: general.d"..., 8000) = 522 <0.000044>stat("/mnt/hgfs/habari/htdocs/", {st_mode=S_IFDIR|0755, st_size=408, ...}) = 0 <0.000527>open("/mnt/hgfs/habari/htdocs/.htaccess", O_RDONLY) = 18 <0.000457>

Zend Drupal Log syslog sfLogger Kohana Logerror_log("Message for the PHP log")error_log("Log to email", 1, "me@foo.com");error_log("Log to a file",3, "/tmp/m.log");error_log("Message for the SAPI log", 4);

MQ Syslog File LOGGING SYSTEMGearman Database Pipe

FirePHP

[root@localhost ~]# pear channel-discover pear.firephp.org[root@localhost ~]# pear install firephp/FirePHPCorerequire_once(FirePHPCore/FirePHP.class.php);ob_start();$firephp = FirePHP::getInstance(true);doStuff($firephp);$firephp->warn(Done Stuff);$firephp->error(An error!);$firephp->log($_GET);ob_end_flush();function doStuff($firephp) { $firephp->trace(Stuff Backtrace); echo "This page intentionally blank";}

RULE 4DIVIDE ANDCONQUER

<?xml version="1.0" encoding="UTF-8"?><phpunit bootstrap="./TestHelper.php"colors="true"> <testsuite name="Commonlib Tests"> <directory>./library/Cl/</directory> <directory>./library/Sso/</directory> </testsuite><filter> <whitelist> <directory suffix=".php">../Sso/</directory> <directory suffix=".php">../Cl/</directory></whitelist></filter></phpunit>

Folder Root CL SSO Auth Client Model UserAdapter Plugin Exception AbstractSSO SFDC Gearman

<?php$worker = new GearmanWorker();$worker->addServer();$worker->addFunction( "allow_access", "allowAccess");$worker->addFunction( "deny_access", "denyAccess");while ($worker->work());

Git Bisectgit bisect startgit bisect badgit bisect good <known good rev>git bisect ?git bisect reset

good bad 1 Request View 2 Front 3Controller Plugin Input Model Filter Controller

Firewall CacheWeb Server Database

Tamper Data Curl FirewallWireshark Cache Netcat Web ServerMySQLProxy Xdebug Database

Tamper Datahttps://addons.mozilla.org/ﬁrefox/addon/966

Wiresharkhttp://www.wireshark.org/

[root@localhost ~]# { echo -ne "HTTP/1.0 200 OKrnrn"; cat test.html; } | nc -l 8080GET / HTTP/1.1User-Agent: curl/7.19.7 (i386-apple-darwin10.0.0)libcurl/7.19.7 OpenSSL/0.9.8l zlib/1.2.3Host: general.dev:8080Accept: */*[root@localhost ~]# curl http://general.dev:8080 -v* About to connect() to general.dev port 8080 (#0)* Trying 192.168.192.129... connected* Connected to general.dev (192.168.192.129) port8080 (#0)> GET / HTTP/1.1> User-Agent: curl/7.19.7 (i386-apple-darwin10.0.0)libcurl/7.19.7 OpenSSL/0.9.8l zlib/1.2.3> Host: general.dev:8080

local log_file = mysql.loglocal fh = io.open(log_file, "a+")function read_query( packet ) if string.byte(packet) == proxy.COM_QUERY then local query = string.sub(packet, 2) fh:write( string.format("%sn",query)) fh:flush() endend MySQL Proxy

RULE 5CHANGE ONETHING ATA TIME

[root@localhost ~]#: svn stM index.php[root@localhost ~]#: git stash saveSaved working directory and index state WIPon master: 0e22fdd Initial checkinHEAD is now at 0e22fdd Initial checkin[root@localhost ~]#: git status# On branch masternothing to commit (working directory clean) Source Control

[root@localhost ~]#: svn log .-------------------------------------------r4341 | rickc | 2010-09-24 03:01 | 3 linesDont test if Post::tags is empty beforegetting tags. There may be a performancehit for this. It can be dealt with if it isnoticable. Fixes ticket #1235. Props to ilofor the patch. Note that Post still needs to be updated to use real Tags, not an array of slug/label pairs as the tags member.-------------------------------------------- Source Control

Known Good[root@localhost ~]# diff -yw web.conf web2.conf<VirtualHost *:80> <VirtualHost *:80> ServerAdmin root@e.com ServerAdmin root@e.com DocumentRoot /www/htdocs | DocumentRoot /www/hdocs ServerName general.dev ServerName general.dev ErrorLog logs/error_log ErrorLog logs/error_log</VirtualHost> </VirtualHost>

RULE 6KEEP ANAUDIT TRAIL

Hot Key Loghttp://www.blacktree.com/http://do.davebsd.com/https://launchpad.net/mbhttp://simplenoteapp.com/

Backpack Journalhttp://backpackit.com/

[root@localhost htdocs]# history 20 365 ls /mnt/hgfs/habari/ 366 ls 367 vi /etc/httpd/conf.d/web.conf 368 setenforce 0 369 /etc/init.d/httpd restart 370 vi /var/log/httpd/error_log 371 cd /mnt/hgfs/habari/ 372 ls 373 cd htdocs/ 374 ls 375 cd scripts/ 376 ls 377 cd .. 378 ls 379 vi /etc/php.ini

RULE 7CHECK THEPLUG

Sources of Plugs[root@localhost ~]# apachectl -MLoaded Modules: core_module (static) mpm_prefork_module (static) http_module (static) so_module (static) [root@localhost ~]# whoami auth_basic_module (shared) root auth_digest_module (shared) [root@localhost ~]# ifconfig authn_file_module (shared) eth0 Link encap:Ethernet HWad authn_alias_module (shared) authn_anon_module inet addr:192.168.192.129 (shared) inet6 addr: fe80::20c:29ff:authn_dbm_module (shared)

RULE 8GET A FRESHVIEW

“Grovelling is nota substitute fordoing yourhomework”- ESRhttp://www.catb.org/esr/faqs/smart-questions.html

RULE 9IF YOU DIDN’TFIX IT -IT AIN’T FIXED

Five Whys The page is blank: Why? There is a fatal error: Why?No mb_check_encoding(): Why? mbstring is not installed: Why? It isn’t part of the build: Why?It was setup for another project.

The Rules1. Understand The System2. Make It Fail3. Quit Thinking And Look4. Divide And Conquer5. Change One Thing At A Time6. Keep An Audit Trail7. Check The Plug8. Get A Fresh View9. If You Didn’t Fix It, It Ain’t Fixed

Questions ?

Image CreditsWhen men were men and wore white coats - by Jitzehttp://www.flickr.com/photos/jitze1942/4292084185/Vacuum Tube Etch-A-Sketch - by Jurvetsonhttp://www.flickr.com/photos/jurvetson/197768962/Classic - by Oskayhttp://www.flickr.com/photos/oskay/1364147095Firmware Bug - by Oskayhttp://www.flickr.com/photos/oskay/1364148351Ready to hop - by Oskayhttp://www.flickr.com/photos/oskay/1364153441/Albino - by Oskayhttp://www.flickr.com/photos/oskay/1364143833Coming Through! - by Oskayhttp://www.flickr.com/photos/oskay/1364147807Tux the Pinguin - by Patrick van der VeldenFrom the photographer’s private collection

THANKANDTOOLSDEBUGGING: RULES YOU http://joind.in/3393

Debugging: Rules And Tools - PHPTek 11 Version

by Ian Barber

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