Exploring XMPP

1. <exploring:xmpp/> Jack Mofﬁtt

2. Why XMPP?

3. HTTP APIs are great

4. HTTP polling sucks

5. Real time is different

6. XMPP is real time

7. XMPP basics

8. XMPP network

13. XMPP addressing

14. example.com

15. jack@example.com

16. jack@example.com/home

17. jack@example.com/work

18. jack@example.com/7a29d835f9c

19. XMPP protocol

20. XML

21. XML streams

22. XML stanzas

23. <message/>

24. <presence/>

25. <iq/>

26. <message/>

27. <message from=’juliet@sapo.pt/home’ to=’romeo@sapo.pt’ type=’chat’> <body> Wherefore art thou, Romeo? </body> </message>

32. <presence/>

33. <presence> <show>away</show> <status>At Codebits</status> </presence>

34. <presence type=’available’> <show>away</show> <status>At Codebits</status> </presence>

37. <iq/>

38. <iq to=’sapo.pt’ type=’get’ id=’disco:1’> <query xmlns=’disco#info’/> </iq>

43. <iq to=’romeo@sapo.pt/home’ from=’sapo.pt’ type=’result’ id=’disco:1’> <query xmlns=’disco#info’> <identity category='server' type='im' name='ejabberd'/> <feature var='vcard-temp'/> </query> </iq>

47. The application

48. example

49. contrived

50. Server monitoring

51. Goodbye SNMP

52. XMPP APIs

53. Features

54. Collection hub

55. Collectors are XMPP bots

56. Controlled via client

57. Presence

58. Discovery

59. Commands

60. Notiﬁcation

61. No processing

62. Presence

63. Communicates status

64. Subscribing

65. <presence type=’subscribe’ to=’xmpp@mon.sapo.pt’/>

66. <presence type=’subscribed’ from=’xmpp@mon...’ to=’client@mon...’/>

67. Rosters

68. <iq type=’get’ id=’roster1’> <query xmlns=’jabber:iq:roster’/> </iq>

69. <iq type=’result’ id=’roster1’> <query xmlns=’jabber:iq:roster’> <item jid=’xmpp@mon...’ subscription=’to’/> </query> </iq>

70. Initial presence

71. <presence/>

72. Starting up

73. <presence from=’xmpp@mon...’/>

74. Dead server

75. <presence type=’unavailable’ from=’xmpp@mon...’/>

76. Busy server

77. <presence type=’available’> <show>away</show> <status> Overloaded. Can’t take more jobs. </status> </presence>

78. Discovery

79. Meta information

80. Disco info

81. <iq id=’disco1’ type=’get’ to=’xmpp@mon...’> <query xmlns=’.../disco#info’/> </iq>

82. <iq ...> <query xmlns=’.../disco#info’> <identity name=’XMPP Monitor’ category=’monitor’ type=’server’/> </query> </iq>

83. Statistics available

84. Disco items

85. <iq id=’disco2’ type=’get’ to=’xmpp@mon...’> <query xmlns=’.../disco#items’/> </iq>

86. <iq ...> <query xmlns=’.../disco#items’> <item name=’CPU Load’ jid=’xmpp@mon...’ node=’cpu’/> ... </query> </iq>

89. Gathering statistics

90. Disco info again

91. With a node

92. <iq id=’disco3’ type=’get’ to=’xmpp@mon...’> <query xmlns=’.../disco#info’ node=’cpu’/> </iq>

93. <iq ...> <query xmlns=’.../disco#info’ node=’cpu’> <statisic xmlns=’codebits’ name=’5-min’ value=’0.4’/> </query> </iq>

94. <statistic/>

95. Extended stanza

96. Create your own

97. Namespace

98. <iq ...> <query xmlns=’.../disco#info’ node=’cpu’> <statisic xmlns=’codebits’ name=’5-min’ value=’0.4’/> </query> </iq>

99. Commands

100. Ad-hoc commands

101. RPC

102. Input and output

103. Data forms

104. <x xmlns='jabber:x:data' type='...'> <field type='hidden' var='FORM_TYPE'> <value>jabber:bot</value> </field> <field type='text-single' var='botname'> <value>Awesome Bot</value> </field> </x>

109. Reboot command

110. <iq ...> <command xmlns=’.../commands’ node=’reboot’ action=’execute’/> </iq>

113. <iq ...> <command xmlns=’.../commands’ node=’reboot’ status=’completed’/> </iq>

114. Stats reset

115. Shell commands

116. Notiﬁcations

117. Important events

118. Limits exceeded

119. Publish subscribe

120. Pubsub

121. Nodes

122. Node hierarchy

123. Leaves

124. Collections

125. Bots publish

126. Client subscribes

127. PEP

128. Personal eventing protocol

129. Proﬁle of pubsub

130. Simple

131. Presence

132. Every JID is a pubsub node

133. Subscriptions are automatic

134. Publishing

135. <iq ...> <pubsub xmlns=’.../pubsub’> <publish node=’codebits’> <item> <rebooted xmlns=’codebits’/> </item> </publish> </pubsub> </iq>

140. Subscribing

141. Automatic

142. Entity capabilities

143. Caps

144. Caps extend presence

145. <presence> <c xmlns=’.../caps’ node=’codebits’ hash=’sha-1’ ver=’...hash...’/> </presence>

148. Interpreted via disco

149. <feature var=’codebits’/> <feature var=’codebits+notify’/>

150. Events

151. <message ...> <event xmlns=’.../pubsub’> <items node=’codebits’> <item> <rebooted xmlns=’codebits’/> </item> </items> </event> </message>

152. Just add code

153. http://www.xmpp.org http://metajack.im jack@metajack.im

Exploring XMPP

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