recurser

Setup 64bit CentOS (PHP5, MySQL, memcached, ketama)

dave — Tue, 24 Jun 2008 01:27:29 +0000

I recently had to set up a few CentOS servers with PHP , MySQL , memcached and ketama, and ended up writing this script to do it. You can grab the whole thing from subversion (you’ll need the php folder as well) or download everything in a zip file .

if [ ! -d src ]; then
    mkdir src
fi;
cd src
 
 
if [ ! -f php-5.2.5.tar.gz ]; then
    wget http://jp2.php.net/get/php-5.2.5.tar.gz/from/jp.php.net/mirror
    tar xvzf php-5.2.5.tar.gz
    sudo yum remove httpd
fi;
 
if [ ! -f memcached-1.2.5.tar.gz ]; then
    wget http://www.danga.com/memcached/dist/memcached-1.2.5.tar.gz
    tar xvzf memcached-1.2.5.tar.gz
fi;
 
if [ ! -d ketama ]; then
    svn co svn://svn.audioscrobbler.net/misc/ketama
    cd ketama/libketama
    sed -ri "s|PREFIX=/usr/local|PREFIX=/usr|" Makefile
fi;
 
 
sudo yum install \
    libxml2 libxml2-devel \
    openssl openssl-devel \
    pcre pcre-devel \
    bzip2 bzip2-devel \
    curl curl-devel \
    db4 db4-devel \
    libjpeg libjpeg-devel \
    libpng libpng-devel \
    freetype freetype-devel \
    gmp gmp-devel \
    libc-client-devel \
    openldap-devel \
    libmcrypt libmcrypt-devel \
    libmhash libmhash-devel \
    mysql-devel \
    ncurses-devel \
    unixODBC-devel \
    postgresql postgresql-devel \
    sqlite sqlite-devel \
    readline readline-devel \
    net-snmp net-snmp-devel \
    libtidy libtidy-devel \
    libxslt libxslt-devel \
    expat-devel \
    httpd-devel \
    libtool-ltdl libtool-ltdl-devel \
    krb5-libs krb5-devel \
    libevent libevent-devel \
    autoconf \
    bison \
    flex
 
 
if [ -d /usr/lib64 ]; then
    export LDFLAGS=-L/usr/lib64/mysql
 
    if [ ! -f /usr/lib/libexpat.so.32bit ]; then
        sudo mv /usr/lib/libexpat.so /usr/lib/libexpat.so.32bit
    fi;
    sudo rm -f /usr/lib/libexpat.so
    sudo ln -s /usr/lib64/libexpat.so /usr/lib/libexpat.so
 
    if [ ! -f /usr/lib/libdb-4.3.so.32bit ]; then
        sudo mv /usr/lib/libdb-4.3.so /usr/lib/libdb-4.3.so.32bit
    fi;
    sudo rm -f /usr/lib/libdb-4.3.so
    sudo ln -s /usr/lib64/libdb-4.3.so /usr/lib/libdb-4.3.so
 
    if [ ! -f /usr/lib/libltdl.so.32bit ]; then
        sudo mv /usr/lib/libltdl.so /usr/lib/libltdl.so.32bit
    fi;
    sudo rm -f /usr/lib/libltdl.so
    sudo ln -s /usr/lib64/libltdl.so /usr/lib/libltdl.so
 
fi;
 
cd ketama/libketama
make clean
make
sudo make install
cd ../../
curr_dir=`pwd`
echo ${curr_dir}
rm -f php-5.2.5/ext/ketama
ln -s ${curr_dir}/ketama/php_ketama ${curr_dir}/php-5.2.5/ext/ketama
if [ -d /usr/lib64 ]; then
    sudo rm -f /usr/lib64/libketama.so
    sudo ln -s /usr/lib/libketama.so /usr/lib64/
fi;
 
cd memcached-1.2.5
make clean
./configure
make
sudo make install
cd ../
 
cd php-5.2.5
make clean
rm -Rf autom4te.cache
./buildconf --force
 
'./configure'  \
    '--host=i686-redhat-linux-gnu' \
    '--build=i686-redhat-linux-gnu' \
    '--target=i386-redhat-linux' \
    '--prefix=/usr/local/php-5.2.5'  \
    '--bindir=/usr/bin' \
    '--sbindir=/usr/sbin' \
    '--sysconfdir=/etc' \
    '--datadir=/usr/share' \
    '--includedir=/usr/include' \
    '--libdir=/usr/lib' \
    '--libexecdir=/usr/libexec' \
    '--localstatedir=/var' \
    '--sharedstatedir=/usr/com' \
    '--mandir=/usr/share/man' \
    '--infodir=/usr/share/info' \
    '--cache-file=../config.cache' \
    '--with-libdir=lib' \
    '--with-config-file-path=/etc' \
    '--with-config-file-scan-dir=/etc/php.d' \
    '--disable-debug' \
    '--with-pic' \
    '--disable-rpath' \
    '--with-bz2' \
    '--with-curl' \
    '--with-exec-dir=/usr/bin' \
    '--with-freetype-dir=/usr/lib' \
    '--with-png-dir=/usr/lib' \
    '--enable-gd-native-ttf' \
    '--without-gdbm' \
    '--with-gettext' \
    '--with-gmp' \
    '--with-iconv' \
    '--with-jpeg-dir=/usr/lib' \
    '--with-openssl' \
    '--with-libexpat-dir=/usr/lib' \
    '--with-pcre-regex=/usr' \
    '--with-zlib' \
    '--with-layout=GNU' \
    '--enable-exif' \
    '--enable-ftp' \
    '--enable-magic-quotes' \
    '--enable-sockets' \
    '--enable-sysvsem' \
    '--enable-sysvshm' \
    '--enable-sysvmsg' \
    '--enable-track-vars' \
    '--enable-trans-sid' \
    '--enable-yp' \
    '--enable-wddx' \
    '--with-kerberos' \
    '--enable-ucd-snmp-hack' \
    '--with-unixODBC=shared,/usr' \
    '--enable-memory-limit' \
    '--enable-shmop' \
    '--enable-calendar' \
    '--enable-dbx' \
    '--enable-dio' \
    '--without-mime-magic' \
    '--without-sqlite' \
    '--with-libxml-dir=/usr/lib' \
    '--enable-force-cgi-redirect' \
    '--enable-pcntl' \
    '--with-imap=shared' \
    '--with-imap-ssl' \
    '--enable-mbstring=shared' \
    '--enable-mbstr-enc-trans' \
    '--enable-mbregex' \
    '--with-ncurses=shared' \
    '--with-gd=shared' \
    '--enable-bcmath=shared' \
    '--enable-dba=shared' \
    '--with-db4=/usr/lib' \
    '--with-xmlrpc=shared' \
    '--with-ldap=shared' \
    '--with-ldap-sasl' \
    '--with-mysql=shared,/usr/lib/mysql' \
    '--with-mysqli=shared,/usr/bin/mysql_config' \
    '--enable-dom=shared' \
    '--with-dom-xslt=/usr/lib' \
    '--with-pgsql=shared' \
    '--with-snmp=shared,/usr'\
    '--enable-soap=shared' \
    '--with-xsl=shared,/usr' \
    '--enable-xmlreader=shared' \
    '--enable-xmlwriter=shared' \
    '--enable-fastcgi' \
    '--enable-pdo=shared' \
    '--with-pdo-odbc=shared,unixODBC,/usr' \
    '--with-pdo-mysql=shared,/usr' \
    '--with-pdo-pgsql=shared,/usr' \
    '--with-pdo-sqlite=shared,/usr' '--enable-json=shared' \
    '--enable-zip=shared' \
    '--with-readline' \
    '--enable-dbase=shared' \
    '--with-mcrypt=shared,/usr' \
    '--with-mhash=shared,/usr' \
    '--with-tidy=shared,/usr' '--with-apxs2' \
    '--with-ketama'
 
sudo yum remove php php-dba php-ldap php-mysql php-mysqli php-pdo
 
make
sudo make install 
cd ../
sudo cp ../php/php.conf /etc/httpd/conf.d/
sudo cp ../php/info.php /var/www/html/
sudo cp ../php/php.ini /etc/php.ini
sudo /usr/sbin/httpd -k stop
 
# PECL path problem - not sure why
sudo sed -ri "s|exec\(\"php-config --prefix\"\)|\"/usr/lib/20060613\"|" /usr/share/pear/PEAR/Builder.php
sudo pecl install --force memcache
 
sudo /usr/sbin/httpd -k start
 
cd ../

Force MySQL Encoding to UTF8

dave — Tue, 24 Jun 2008 01:06:55 +0000

Often MySQL will need to be forced to return results in UTF8 encoding. There are two ways to do this:

Run a query “SET NAMES ‘utf8’” at the start of each connection – this will force MySQL to use UTF8 for the lifetime of that connection. This is a good option if you don’t have access to the my.cnf file.

A better option – find and edit the file my.cnf on your database server. Add the following lines to the mysqld section :
```
[mysqld]
default-character-set=utf8
skip-character-set-client-handshake
```
Now if you restart MySQL, the encoding should default to UTF8.

Browser detection with PHP

dave — Tue, 24 Jun 2008 00:59:24 +0000

You can use PHP’s get_browser() function to find out information about user’s browsers, but it takes a little setting up.

Download a browscap file from garykeith.com . I found lite_php_browscap.ini good enough for my needs, but depending on what you want you might want a different version.
Save it somewhere sensible on the server – I put it in /usr/lib64/php/extras/browscap.ini on our 64-bit server.
Edit php.ini, and add the following line section (or edit it if it’s already there) :
```
[browscap]
browscap = /usr/lib64/php/extras/browscap.ini
```
Now restart apache
```
$ sudo apachectl restart
```

Now if you use the get_browser() function, it should return something like the following :

stdClass Object
(
    [browser_name_regex] => ^mozilla/5\.0 (macintosh; .; .*mac os x.*; .*rv:1\.9.*) gecko/.*$
    [browser_name_pattern] => Mozilla/5.0 (Macintosh; ?; *Mac OS X*; *rv:1.9*) Gecko/*
    [parent] => Mozilla 1.9
    [platform] => MacOSX
    [browser] => Mozilla
    [version] => 1.9
    [majorver] => 1
    [minorver] => 9
    [alpha] => 1
    [frames] => 1
    [iframes] => 1
    [tables] => 1
    [cookies] => 1
    [javaapplets] => 1
    [javascript] => 1
    [css] => 2
    [cssversion] => 2
    [supportscss] => 1
    [beta] => 
    [win16] => 
    [win32] => 
    [win64] => 
    [backgroundsounds] => 
    [authenticodeupdate] => 
    [cdf] => 
    [vbscript] => 
    [activexcontrols] => 
    [stripper] => 
    [isbanned] => 
    [wap] => 
    [ismobiledevice] => 
    [issyndicationreader] => 
    [crawler] => 
    [aol] => 
    [aolversion] => 0
    [netclr] => 
    [clrversion] => 0
)

PHP5 on OS X Leopard

dave — Tue, 24 Jun 2008 00:43:08 +0000

PHP5 is already installed on Leopard by default – all you have to do is turn it on.

First, turn on web sharing – go to System Preferences->Sharing and make sure the ‘Web Sharing’ option is turned on.

Next, open the apache config file in a text editor using sudo.

$ sudo vi /etc/apache2/httpd.conf

Search for this line:

#LoadModule php5_module libexec/apache2/libphp5.so

And un-comment it by removing the ’#’ at the start of the line:

LoadModule php5_module libexec/apache2/libphp5.so

The restart apache:

$ sudo apachectl restart

To test if it is working properly, make a file in the Sites folder for your user called test.php (in my case this is Users/dave/Sites/test.php ) containing the following:

= phpinfo() ?>

Now if you go to http://localhost/~YOUR_USER_NAME/test.php (note the ’~’ character before your username – it’s important), you should see something like this:

Subversion Server on CentOS

dave — Fri, 28 Mar 2008 00:08:46 +0000

1. Install a couple of packages via yum:

$ sudo yum install httpd subversion mod_dav_svn

2. Create a directory to store the svn repositories in :

$ sudo mkdir -p /var/lib/subversion/repositories
$ sudo chown -R apache:apache /var/lib/subversion

3. Because I make and delete repositories quite a lot, i made a script to build them. Save this script somewhere and make it executable. I saved it as /bin/make-repos so i can use it from anywhere.

#!/bin/sh
 
if [ $# -ne 1 ]; then
    echo 1>&2 Usage: $0 repository_name
    exit 127
fi
 
echo "Sudoing...";
sudo svnadmin create --fs-type fsfs /var/lib/subversion/repositories/${1}
sudo chown -R apache:apache /var/lib/subversion/repositories/${1}
sudo chmod -R g+w /var/lib/subversion/repositories/${1}
sudo chmod g+s /var/lib/subversion/repositories/${1}/db

4. Create a new file /etc/httpd/conf.d/svn.conf with the following contents :

LoadModule dav_svn_module modules/mod_dav_svn.so
LoadModule dav_svn_module modules/mod_authz_svn.so
 

  DAV svn
  SVNParentPath /var/lib/subversion/repositories
  SVNListParentPath on
  SVNPathAuthz off
  AuthType Basic
  AuthName "subversion@tokyo"
  AuthUserFile /var/lib/subversion/passwords
  Require valid-user

You may not need the first 2 LoadModule lines if they are already in your global httpd.conf.

5. Create your password file:

$ sudo htpasswd -c /var/lib/subversion/passwords new-user-name

Where new-user-name is the name of the user you want to create.

6. Restart Apache and you’re done!

$ sudo /etc/init.d/httpd restart

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Format JSON with PHP

dave — Wed, 12 Mar 2008 02:11:29 +0000

/**
 * Indents a flat JSON string to make it more human-readable
 *
 * @param string $json The original JSON string to process
 * @return string Indented version of the original JSON string
 */
public static function indent($json) {
 
    $result    = '';
    $pos       = 0;
    $strLen    = strlen($json);
    $indentStr = '  ';
    $newLine   = "\n";
 
    for($i = 0; $i <= $strLen; $i++) {
        
        // Grab the next character in the string
        $char = substr($json, $i, 1);
        
        // If this character is the end of an element, 
        // output a new line and indent the next line
        if($char == '}' || $char == ']') {
            $result .= $newLine;
            $pos --;
            for ($j=0; $j<$pos; $j++) {
                $result .= $indentStr;
            }
        }
        
        // Add the character to the result string
        $result .= $char;
 
        // If the last character was the beginning of an element, 
        // output a new line and indent the next line
        if ($char == ',' || $char == '{' || $char == '[') {
            $result .= $newLine;
            if ($char == '{' || $char == '[') {
                $pos ++;
            }
            for ($j = 0; $j < $pos; $j++) {
                $result .= $indentStr;
            }
        }
    }
 
    return $result;
}

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jQuery i18n Translation Plugin

dave — Thu, 21 Feb 2008 21:13:57 +0000

I’ve recently had to do some translation on the client-side using JavaScript, and wrote this plugin to do it (based heavily on javascript i18n that almost doesn’t suck by Marcus).

Download jquery.i18n.js.

To try it out, download the sample files , or check them out using subversion :

svn co http://svn.recurser.com/misc/jquery/i18n/

The index.html file should be fairly self-explanatory… before you do any translation you have to initialise the plugin with a ‘dictionary’ (basically a property list mapping keys to their translations).

var my_dictionary = { 
    "some text"  : "a translation",
    "some more text"  : "another translation"
}
$.i18n.setDictionary(my_dictionary);

Once you’ve initialised it with a dictionary, you can translate strings using the $.i18n._() function, for example :

$('div#example').text($.i18n._('some text'));

If you a solution that’s a bit more global, Keith Wood has written a localisation plugin that looks very nice (i haven’t actually tried it).

jQuery SimpleColor Color-Picker

dave — Wed, 19 Dec 2007 07:52:07 +0000

As the name suggests, a very simple color-picker plugin that displays a square grid of colors to select from. I found a lot of the other color-picker plugins quite heavy, and so I ended up writing this. The list of colors it uses can be customized, and the layout size etc can be configured to a certain extent.

Download jquery.simpleColor.js.

To try it out, download the sample files , or check them out using subversion :

svn co http://svn.recurser.com/misc/jquery/simpleColor/

Edit: If this doesn’t meet your particular needs, Virgil Reboton has written something quite similar .

Find Prime Factors with Python

dave — Mon, 17 Dec 2007 14:48:03 +0000

I’ve been slowly working through the Project Euler problems, and came across a prime sieve algorithm for Python , which I’ve modified slightly to return the prime factors of a number. It doesn’t actually work to solve the Project Euler problem in question because it runs out of memory on the range(3,n+1,2) call, but it may come in handy for smaller numbers.

def primeFactors(n): 
	if n==2: return [2]
	elif n<2: return []
	s=range(3,n+1,2)
	mroot = n ** 0.5
	half=(n+1)/2-1
	i=0
	m=3
	while m <= mroot:
		if s[i]:
			j=(m*m-3)/2
			s[j]=0
			while j[j]=0
				j+=m
		i=i+1
		m=2*i+3
	return [2]+[x for x in s if x and n%x==0]

Default Values With Hibernate Annotations

dave — Thu, 06 Dec 2007 05:37:37 +0000

To set the default value of a field with Hibernate, you can use the columnDefinition argument :

/**
 * Returns the file size of this Photo
 */
@Column(name="file_size",nullable=false,columnDefinition="bigint(20) default 0")
public Long getFileSize() {
    return fileSize;
}
    
/**
 * Sets the file size of this Photo
 *
 * @param fileSize File size of this Photo
 */
public void setFileSize(Long fileSize) {
    this.fileSize = fileSize;
}

Adding Appfuse Dependencies

dave — Thu, 06 Dec 2007 00:33:02 +0000

I recently had trouble importing the com.sun.media.jai imaging library into appfuse :

The import com.sun.media.jai cannot be resolved

To add a dependency in your pom.xml, first add the new repository (may not be strictly necessary if the library is already in the default appfuse repositories) :


    ......
    
        com.sun.media
        http://repository.jboss.com/maven2
    
    ......

Next, add the dependency version :


    ......
        1.1.3
    ......

And finally, add the dependency itself :


    ......
    
        com.sun.media
        jai-codec
        ${jai.version}
    
    ......

Complex Constants in Java

dave — Wed, 05 Dec 2007 15:07:34 +0000

If you want to assign a complex class (such as a HashMap / ArrayList etc) as a constant in Java, use the static initializer block construct :

import java.util.ArrayList;
import java.util.HashMap;
 
public class MyConstants {
 
       public final static HashMap myHashMap = new HashMap();
       static {
		myHashMap.put("key1", "value1");
		myHashMap.put("key2", "value2");
		myHashMap.put("key3", "value3");
	}
 
       public final static ArrayList myArrayList = new ArrayList();
       static {
		myArrayList.add("value4");
		myArrayList.add("value5");
		myArrayList.add("value6");
	}
}

MySQL Delete On Joined Tables

dave — Mon, 03 Dec 2007 05:20:16 +0000

If you want to (for example) delete all users with the guest role from your database :

DELETE FROM user WHERE EXISTS (
    SELECT * FROM role
    WHERE role.id = user.role_id
    AND role.name = 'guest'
);

Get complete AppFuse sources

dave — Wed, 28 Nov 2007 13:22:02 +0000

To get the complete, exploded source of an AppFuse application, run

#> mvn appfuse:full-source

Skip AppFuse Tests

dave — Tue, 27 Nov 2007 16:07:41 +0000

To skip tests when compiling/running AppFuse applications, add the -Dmaven.test.skip=true argument to your Maven call:

#> mvn jetty:run-war -Dmaven.test.skip=true