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Code Issues Packages Projects Releases Wiki Activity

- Added the Sofia dbus talks (and now also all the slides).

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Derick Rethans
2009-04-29 09:26:21 +00:00
parent ee0e6143bc
commit 50bff042ad
39 changed files with 2142 additions and 1 deletions
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<?xml version="1.0" encoding="iso-8859-1"?>
<presentation
template="css"
navmode="html"
navbarbackground="#4373b4"
navbartopiclinks="0"
navColor="#000000"
logo1=""
stylesheet="presentations/slides/ezc/ez.css"
backgroundfixed="1" >
<topic>DBUS</topic>
<title>PHP and DBUS</title>
<event>WebTech 2009</event>
<location>Veliko Turnovo, Bulgaria</location>
<date>Apr 26th, 2009</date>
<speaker>Derick Rethans</speaker>
<email>dr@ez.no</email>
<twitter>derickr</twitter>
<url>http://derickrethans.nl/talks.php</url>
<slide>slides/dbus/title.xml</slide>
<slide>slides/dbus/what-is-dbus.xml</slide>
<slide>slides/dbus/what-is-dbus-used-for.xml</slide>
<slide>slides/dbus/design-overview.xml</slide>
<slide>slides/dbus/message-types.xml</slide>
<slide>slides/dbus/identifying-objects.xml</slide>
<slide>slides/dbus/data-types.xml</slide>
<slide>slides/dbus/signatures.xml</slide>
<!-- PHP -->
<slide>slides/dbus/php-dbus-ext.xml</slide>
<slide>slides/dbus/php-as-client.xml</slide>
<slide>slides/dbus/data-type-mapping.xml</slide>
<slide>slides/dbus/data-type-mapping2.xml</slide>
<slide>slides/dbus/notify-hard.xml</slide>
<slide>slides/dbus/introspection.xml</slide>
<slide>slides/dbus/notify-introspect.xml</slide>
<slide>slides/dbus/php-as-server.xml</slide>
<slide>slides/dbus/signal.xml</slide>
<slide>slides/dbus/signal-send.xml</slide>
<slide>slides/dbus/skype.xml</slide>
<slide>slides/dbus/skype-theory-objects.xml</slide>
<slide>slides/dbus/skype-odd-api.xml</slide>
<slide>slides/dbus/skype-poll.xml</slide>
<slide>slides/dbus/skype-signal.xml</slide>
<slide>slides/dbus/pidgin.xml</slide>
<slide>slides/dbus/pidgin-example.xml</slide>
<slide>slides/dbus/what-next.xml</slide>
<slide>slides/internals/questions.xml</slide>
</presentation>

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<slide>
<title>Data-type mapping</title>
<subtitle>From PHP to DBUS</subtitle>
<blurb>Basic types</blurb>
<list>
<bullet>boolean -> boolean</bullet>
<bullet>integer -> int32</bullet>
<bullet>double -> double</bullet>
<bullet>string -> string</bullet>
<bullet>array -> array (only basic types as values are supported)</bullet>
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<blurb>Specific type classes</blurb>
<list>
<bullet>DbusByte, DbusBool, DbusInt16, DbusUInt16, DbusInt32, DbusUInt32, DbusInt64, DbusUInt64, DbusDouble</bullet>
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<bullet>DbusStruct( string $signature, array $elements )</bullet>
<bullet>DbusSet( array $elements )</bullet>
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<bullet>dict-entry -> variable (could be anything)</bullet>
<bullet>variant -> DbusVariant</bullet>
<bullet>struct -> DbusStruct</bullet>
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<bullet>dictionary entry (contains a key (basic type) and a value, must be part of an array)</bullet>
<bullet>variant (contains a type and a value)</bullet>
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15
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<slide>
<title>Identifying objects</title>
<list>
<bullet>*Bus*: Communication pathways that clients can transport messages over</bullet>
<bullet>*Connection*: Every connection to the bus has one (or more) unique names (random and well-known) (~:1.363~ or ~nl.derickrethans.test~).</bullet>
<bullet>*Object*: A communications end-point that a process exports to offer its services (~/nl/derickrethans/test~).</bullet>
<bullet>*Proxy*: A client-level representation of an object on the bus.</bullet>
<bullet>*Method*: A function on an object; they have input and output parameters and are called through proxies.</bullet>
<bullet>*Signal*: One way communications from an object to registered clients.</bullet>
<bullet>*Members*: A collection of methods and signals.</bullet>
<bullet>*Interface*: A collection of members; each object can implement multiple interfaces (~nl.derickrethans.test~, ~org.freedesktop.DBus.Introspectable~).</bullet>
</list>
</slide>

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<slide>
<title>Introspection</title>
<list>
<bullet>Most services provide information about their methods' arguments through ~org.freedesktop.DBus.Introspectable~.</bullet>
<bullet>The DBUS extension currently switches between *i* and *u* only.</bullet>
</list>
<example><![CDATA[<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<node>
<interface name="org.freedesktop.Notifications">
<method name="Notify">
<arg name="app_name" type="s" direction="in"/>
<arg name="id" type="u" direction="in"/>
<arg name="icon" type="s" direction="in"/>
<arg name="summary" type="s" direction="in"/>
<arg name="body" type="s" direction="in"/>
<arg name="actions" type="as" direction="in"/>
<arg name="hints" type="a{sv}" direction="in"/>
<arg name="timeout" type="i" direction="in"/>
<arg name="return_id" type="u" direction="out"/>
</method>
<method name="GetServerInformation">
<arg name="return_name" type="s" direction="out"/>
<arg name="return_vendor" type="s" direction="out"/>
<arg name="return_version" type="s" direction="out"/>
<arg name="return_spec_version" type="s" direction="out"/>
</method>
<method name="GetCapabilities">
<arg name="return_caps" type="as" direction="out"/>
</method>
<method name="CloseNotification">
<arg name="id" type="u" direction="in"/>
</method>
</interface>
<interface name="org.freedesktop.DBus.Introspectable">
<method name="Introspect">
<arg name="data" direction="out" type="s"/>
</method>
</interface>
<interface name="org.freedesktop.DBus.Properties">
<method name="Get">
<arg name="interface" direction="in" type="s"/>
<arg name="propname" direction="in" type="s"/>
<arg name="value" direction="out" type="v"/>
</method>
<method name="Set">
<arg name="interface" direction="in" type="s"/>
<arg name="propname" direction="in" type="s"/>
<arg name="value" direction="in" type="v"/>
</method>
<method name="GetAll">
<arg name="interface" direction="in" type="s"/>
<arg name="props" direction="out" type="a{sv}"/>
</method>
</interface>
</node>]]></example>
</slide>

28
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<slide>
<title>Message Types</title>
<blurb>Method calls</blurb>
<list>
<bullet>From one application to another</bullet>
</list>
<break/>
<blurb>Method returns</blurb>
<list>
<bullet>Upon succesfull method execution</bullet>
</list>
<break/>
<blurb>Method error returns</blurb>
<list>
<bullet>Upon a failure while executing the method</bullet>
</list>
<break/>
<blurb>Signals</blurb>
<list>
<bullet>Broadcast from one application to all others</bullet>
</list>
<break/>
</slide>

30
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<slide>
<title>Talking to a DBUS object from PHP</title>
<subtitle>Using explicit integer types</subtitle>
<blurb>notify.php:</blurb>
<example><![CDATA[<?php
$d = new Dbus( Dbus::BUS_SESSION );
$n = new DbusObject(
$d, // dbus connection
"org.freedesktop.Notifications", // connection name
"/org/freedesktop/Notifications", // object
"org.freedesktop.Notifications" // interface
);
$id = $n->Notify(
'Testapp', new DBusUInt32( 0 ), // app_name, replaces_id
'iceweasel', 'Testing http://ez.no', 'Test Notification', // app_icon, summary, body
new DBusArray( DBus::STRING, array() ), // actions
new DBusDict( // hints
DBus::VARIANT,
array(
'x' => new DBusVariant( 500 ), // x position on screen
'y' => new DBusVariant( 500 ), // y position on screen
'desktop-entry' => new DBusVariant( 'rhythmbox' )
)
),
1000 // expire timeout in msec
);
echo $id[0], "\n";
?>]]></example>
</slide>

30
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<slide>
<title>Talking to a DBUS object from PHP</title>
<subtitle>Using introspection to select the correct integer type</subtitle>
<blurb>notify-introspect.php:</blurb>
<example><![CDATA[<?php
$d = new Dbus( Dbus::BUS_SESSION, true );
$n = new DbusObject(
$d, // dbus connection
"org.freedesktop.Notifications", // connection name
"/org/freedesktop/Notifications", // object
"org.freedesktop.Notifications" // interface
);
$id = $n->Notify(
'Testapp', 0, // app_name, replaces_id
'iceweasel', 'Testing http://ez.no', 'Test Notification', // app_icon, summary, body
new DBusArray( DBus::STRING, array() ), // actions
new DBusDict( // hints
DBus::VARIANT,
array(
'x' => new DBusVariant( 500 ), // x position on screen
'y' => new DBusVariant( 500 ), // y position on screen
'desktop-entry' => new DBusVariant( 'rhythmbox' )
)
),
1000 // expire timeout in msec
);
echo $id[0], "\n";
?>]]></example>
</slide>

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22
slides/dbus/php-as-client.xml Normal file
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<slide>
<title>Talking to a DBUS object from PHP</title>
<subtitle>Activating the screensaver</subtitle>
<blurb>screensaver.php:</blurb>
<example><![CDATA[<?php
$d = new Dbus;
$n = new DbusObject(
$d,
"org.gnome.ScreenSaver",
"/org/gnome/ScreenSaver",
"org.gnome.ScreenSaver"
);
var_dump( $n->GetActive() );
$n->SetActive( true );
var_dump( $n->GetActive() );
sleep( 5 );
$n->SetActive( false );
?>]]></example>
</slide>

31
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<slide>
<title>Providing DBUS services through PHP</title>
<list>
<bullet>Request a connection name</bullet>
<bullet>Register a class that provides methods</bullet>
<bullet>Introspection is not yet supported</bullet>
</list>
<example><![CDATA[<?php
$d = new Dbus( Dbus::BUS_SESSION, true );
$d->requestName( 'nl.derickrethans.test' );
$d->registerObject(
'/nl/derickrethans/test', 'nl.derickrethans.test', 'testClass' );
class testClass {
static function echoOne( $a ) {
return $a;
}
static function echoTwo( $a, $b ) {
return new DbusSet( $a, $b );
}
}
do {
$s = $d->waitLoop( 1000 );
} while ( true );
?> ]]></example>
</slide>

13
slides/dbus/php-dbus-ext.xml Normal file
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<slide>
<title>PHP DBUS extension</title>
<list>
<bullet>DBUS bindings using the low-level C library (libdbus)</bullet>
<bullet>Provides proxy objects</bullet>
<bullet>Implements automatic-marshalling of data</bullet>
<bullet>Provides specific classes for full control</bullet>
<bullet>Support for method invocation, method calls, sending and receiving signals</bullet>
<bullet>(Basic) support for introspection</bullet>
</list>
</slide>

31
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<slide>
<title>Pidgin example</title>
<subtitle>Listing which buddies are online</subtitle>
<example><![CDATA[<?php
$d = new Dbus;
$n = new DbusObject( $d,
"im.pidgin.purple.PurpleService",
"/im/pidgin/purple/PurpleObject",
"im.pidgin.purple.PurpleInterface"
);
$data = $n->PurpleAccountsGetAllActive();
foreach ( $data[0]->getData() as $account )
{
$buddies = $n->PurpleFindBuddies( $account, '' );
$protocol = $n->PurpleAccountGetProtocolName( $account );
echo $protocol[0], "\n";
foreach ( $buddies[0]->getData() as $buddyId )
{
$online = $n->PurpleBuddyIsOnline( $buddyId );
$alias = $n->PurpleBuddyGetAlias( $buddyId );
if ( $online[0] )
{
printf( "- %s\n", $alias[0] );
}
}
}
?>]]></example>
</slide>

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<slide>
<title>Pidgin</title>
<subtitle>Implements things through a proper interface</subtitle>
<list>
<bullet>It exposes everything through some form of objecty model</bullet>
<bullet>A new method for every functionality</bullet>
<bullet>Uses IDs to identify objects</bullet>
<bullet>Uses signals extensively</bullet>
<bullet>It's not documented very well, but it matches the internal C API</bullet>
</list>
<image align="center" filename="Pidgin.png"/>
</slide>

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<slide>
<title>Sending signals</title>
<example><![CDATA[<?php
$d = new Dbus( Dbus::BUS_SESSION, true );
$d->requestName( 'nl.derickrethans.test' );
$s = new DbusSignal(
$d,
'/nl/derickrethans/SignalObject',
'nl.derickrethans.Interface',
'TestSignal'
);
$s->send( "ze data", new DBusArray( Dbus::STRING, array( 'one', 'two' ) ) );
?> ]]></example>
</slide>

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<slide>
<title>Watching signals</title>
<example><![CDATA[<?php
$d = new Dbus;
$d->addWatch( 'org.freedesktop.PowerManagement.Backlight' );
$d->addWatch( 'nl.derickrethans.Interface' );
do
{
$s = $d->waitLoop( 1000 );
if ( !$s ) continue;
if ( $s->matches(
"org.freedesktop.PowerManagement.Backlight", "BrightnessChanged" )
{
$b = $s->getData();
echo "Brightness: {$b[0]}\n";
}
if ( $s->matches( 'nl.derickrethans.Interface', 'TestSignal' ) )
{
var_dump( $s->getData() );
}
}
while ( true );
?> ]]></example>
</slide>

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<slide>
<title>Signatures</title>
<blurb>Each method call has a signature for incoming and outgoing parameters</blurb>
<break/>
<blurb>Examples:</blurb>
<list>
<bullet>*ii*: two 32bit signed integers</bullet>
<bullet>*tn*: a 64bit unsigned integer, and a 16bit signed integer</bullet>
<bullet>*ssiib*: two strings, two integers and a byte</bullet>
<bullet>*ad*: an array of doubles (each array has one type following to determine the child's type)</bullet>
<bullet>*a{sv}*: an array containing dictionary entries with a string key, and a variant value</bullet>
<bullet>*a(iiss)*: an array containing a struct with two integers and two strings</bullet>
<bullet>*aai*: an array of arrays containing integers</bullet>
</list>
</slide>

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<slide>
<title>Skype</title>
<subtitle>Odd DBUS API</subtitle>
<list>
<bullet>Everything in and out happens with a weird string protocol</bullet>
<bullet>It does not make use of objects at all</bullet>
<bullet>It doesn't send signals, but you have to provide a callback</bullet>
</list>
</slide>

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<slide>
<title>Skype in polling mode</title>
<example><![CDATA[<?php
$d = new Dbus( Dbus::BUS_SESSION, true );
$n = new DbusObject( $d, "com.Skype.API", "/com/Skype", "com.Skype.API");
$n->Invoke( "NAME PHP" );
$n->Invoke( "PROTOCOL 7" );
$chatId = $n->Invoke( "CHAT CREATE username" );
list( $ignore, $id, $stuff, $stuff2 ) = explode( " ", $chatId[0] );
$n->Invoke( "OPEN CHAT $id" );
while ( true )
{
$r = $n->Invoke( "GET CHAT $id RECENTCHATMESSAGES" );
list( $ignore, $dummy, $dummy, $messageIds ) = explode( ' ', $r[0], 4 );
foreach( explode( ", ", $messageIds ) as $messageId )
{
$data = $n->Invoke( "GET CHATMESSAGE $messageId FROM_HANDLE" );
list( $a, $b, $c, $name ) = explode( ' ', $data[0], 4 );
$data = $n->Invoke( "GET CHATMESSAGE $messageId BODY" );
list( $a, $b, $c, $body ) = explode( ' ', $data[0], 4 );
echo $name, ": ", $body, "\n";
$n->Invoke( "SET CHATMESSAGE $messageId SEEN" );
}
sleep( 30 );
}
?>]]></example>
</slide>

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<slide>
<title>Skype with callback</title>
<subtitle>Instead they should have used signals...</subtitle>
<example><![CDATA[<?php
$d = new Dbus( Dbus::BUS_SESSION, true );
$n = new DbusObject( $d, "com.Skype.API", "/com/Skype", "com.Skype.API");
$n->Invoke( "NAME PHP" ); $n->Invoke( "PROTOCOL 7" );
$chatId = $n->Invoke( "CHAT CREATE username" );
list( $ignore, $id, $stuff, $stuff2 ) = explode( " ", $chatId[0] );
var_dump( $n->Invoke( "OPEN CHAT $id" ) );
class testClass {
static function notify($a) {
global $n;
@list( $a, $b, $c ) = explode( ' ', $a, 3 );
if ( $a === "CHATMESSAGE" ) {
$data = $n->Invoke( "GET CHATMESSAGE $b BODY" );
list( $a, $b, $c, $body ) = explode( ' ', $data[0], 4 );
echo $body, "\n";
}
}
}
$d->registerObject(
'/com/Skype/Client', 'com.Skype.API.Client', 'testClass' );
do {
$s = $d->waitLoop( 1000 );
} while ( true );
?>]]></example>
</slide>

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<slide>
<title>Skype</title>
<subtitle>Objects</subtitle>
<list>
<bullet>USER object</bullet>
<bullet>PROFILE object</bullet>
<bullet>CALL object</bullet>
<bullet>MESSAGE object</bullet>
<bullet>CHAT object</bullet>
<bullet>CHATMEMBER object</bullet>
<bullet>CHATMESSAGE object</bullet>
<bullet>VOICEMAIL object</bullet>
<bullet>SMS object</bullet>
<bullet>APPLICATION object</bullet>
<bullet>GROUP object</bullet>
<bullet>FILETRANSFER object</bullet>
</list>
</slide>

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<slide>
<title>Skype</title>
<list>
<bullet>Implements (on Linux) a DBUS API for communications</bullet>
<bullet>Documented at https://developer.skype.com/Docs/ApiDoc/src (sparsely)</bullet>
</list>
<image align="center" filename="skype.png"/>
</slide>

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<break/>
<blurb class="event-date">:-:event:-: - :-:location:-:</blurb>
<break/>
<blurb class="event-presenter">Derick Rethans - dr@ez.no</blurb>
<blurb class="event-presenter">Derick Rethans - dr@ez.no - twitter: @:-:twitter:-:</blurb>
<break/>
<blurb class="pres-url-small">:-:url:-:</blurb>
</slide>

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<slide>
<title>What is DBUS used for?</title>
<list>
<bullet>On the (GNOME) desktop: Avahi, CUPS, GConf, Nautilus, Network Manager, Power Manager, Screen Saver, Volume Manager</bullet>
<bullet>System level elements: HAL</bullet>
<bullet>Gnome applications: Pidgin, Rhythmbox</bullet>
<bullet>Other applications: skype</bullet>
<bullet>But also on the Openmoko platform (freesmartphone.org)</bullet>
</list>
<break lines="2"/>
<div align="center">
<image filename="gnome.png"/>
<image filename="Pidgin.png"/>
<image filename="Rhythmbox_logo.png"/>
<image filename="openmoko.png"/>
<image filename="skype.png"/>
</div>
</slide>

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<slide>
<title>What is DBUS?</title>
<list>
<bullet>Part of the freedesktop.org project</bullet>
<bullet>It is meant to replace Corba (GNOME) and DCOP (KDE)</bullet>
<bullet>A message bus system, a simple way for applications to talk to one another</bullet>
<bullet>It consists of a deamon, a library and a protocol</bullet>
<bullet>It is both meant for system level and session level communication</bullet>
</list>
<image align="center" filename="Freedesktop-logo.png"/>
</slide>

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<slide>
<title>What's the real goal?</title>
<list>
<bullet>Running apps on the OpenMoko</bullet>
<bullet>With PHP-GTK</bullet>
</list>
</slide>