Messaging with Erlang and Jabber
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1 Messaging with Erlang and Jabber Erlang User Conference '04 21st. October 2004 Mickaël Rémond
2 What are XMPP and Jabber? XMPP stands for extensible Messaging & Presence Protocol XMPP is a generic and extensible messaging protocol based on XML. It is now an IETF standard Jabber is an Instant Messaging protocol that rely on XMPP Very active community: Several server implementations of XMPP and Jabber Several client software and libraries 2
3 What does the XMPP protocol looks like? Interleaved XML document streams: Client and serverstreams form an XML document. First level tag: <stream> Three types of second levels tags: message: asynchronous communications iq: Synchronous communications presence: presence and status data 3
4 Example XMPP telnet session Step 0: telnet localhost 5222 Step 1: Open XMPP stream Client sends: <?xml version='1.0'?> <stream:stream xmlns:stream=" to="localhost" xmlns="jabber:client"> Server answers: <?xml version='1.0'?> <stream:stream xmlns='jabber:client' xmlns:stream=' id=' ' from='localhost'> 4
5 Example XMPP telnet session Step 2: Login Client send login informations: <iq type='set' id='auth'> <query xmlns='jabber:iq:auth'> <username>mremond</username> <password>azerty</password> <resource>telnetclient</resource></query></iq> Server confirms login: <iq type='result' id='auth'/> 5
6 Example XMPP telnet session Step 2: Login The server can returns an error on failed authentication for example: <iq type='error' id='auth'> <query xmlns='jabber:iq:auth'> <username>mremond</username> <password>d</password> <resource>telnetclient</resource></query> <error code='401' type='auth'> <not-authorized xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/> </error></iq> 6
7 Example XMPP telnet session Step 3: Presence Client sends presence data <presence/> If applications in our client roster are online, our telnet client receives presence packets: <presence <priority>8</priority> </presence> 7
8 Example XMPP telnet session Step 3: Presence From here, our telnet client is visible online by other clients: 8
9 Example XMPP telnet session Step 4: Sending a message Client sends a message to another user / application: <message to='mremond5@localhost'> <subject>hello</subject> <body>i am chatting with a Telnet client! </body> </message> No answer from the server 9
10 Example XMPP telnet session Step 5: Receiving a message We can receive messages from other clients: <message from='mremond5@localhost/tkabber' to='mremond@localhost/telnetclient' type='chat' xml:lang='fr-fr'> <body>answer from the other side</body> <x xmlns='jabber:x:event'> <offline/> <delivered/> <displayed/> <composing/> </x></message> 10
11 Example XMPP telnet session Step 6: Presence update Presence informations are updated (For example here, when a user in our roster disconnect): <presence from='mremond5@localhost/tkabber' to='mremond@localhost/telnetclient' type='unavailable'/> 11
12 Example XMPP telnet session Step 7: Closing the XML stream Client closes XML client stream tag (This end a valid XML document): </stream:stream> Server then closes XML stream tag and disconnect (This end the second XML document): </stream:stream> 12
13 XMPP bus design XMPP rely on a naturally distributed architecture (No central server!) Includes server to server communications (with domain routing between servers) Includes gateways to various other protocols 13
14 XMPP protocol extensions XMPP is an extensible protocol (with XML namespaces) that supports many interesting features: Service discovery and browsing Publish & Subscribe: Allow 1 to n communications. Reliable messages: can add confirmations delivery. Message queues for offline applications and messages expiration. Users or applications search. Geolocalisation. Message archiving
15 Fun things to do with XMPP and Erlang Implementation: XMPP and Jabber servers are massively concurrent: a Jabber server must handle huge community of users. A Jabber server in Erlang makes sense to handle massive concurrency. It can prove Erlang reliability, scalability, ability to handle concurrency Extensions: XMPP server protocol is build around a complete XML API for client to server and server to server communications: Developping Erlang software agents that plug on the bus is easy: Erlang expressiveness. It allows to use the bus as a mediation layer between Erlang and non- Erlang software (Kind of web service but more simple and powerful) Several levels of interaction for Erlang-based extensions: Plug-in in the XMPP bus with a service protocol or XMPP client connected to the bus (client protocol) Use: XMPP can be used as an instant messaging platform or integrated with other communication services. 15
16 Implementing an XMPP server in Erlang 16
17 ejabberd ejabberd is an Erlang-based XMPP server implementation. It has been designed to support clustering, fault-tolerance and highavailability. It supports many features and extensions of the Jabber protocol: Built-in Multi-User Chat service Distributed database (Mnesia) Built-in IRC transport Built-in Publish-Subscribe service Support for LDAP authentification Service discovery It is more scalable than the most used open source implementation (Jabberd1.4 and Jabber2). 17
18 Benchmarks: how does ejabberd perform? Jabber benchmarks realized with the Tsunami benchmarking tool. Ejabberd performs very well: It can route more than 2000 simple messages per second (on a single CPU 1,5 Ghz machine). It can handle a huge number of concurrent users on a single machine (Has reached 7000 users connected without troubles. We need to push the test further). This good performance is achieved while being the most featureful and stable server XMPP. ejabberd design can be improved to achieve better performance. 18
19 simultaneous users ejabberd Delay to send short messages Response time and connection establishement 19
20 The benchmark server CPU: Bi-Xeon 2,4 Ghz Ram: 1 Go Operating System: Linux Note: The second CPU was not used as only one ejabberd instance was running on the server. 20
21 Developing XMPP clients in Erlang 21
22 Jabberlang: Helper library to write XMPP client in Erlang Jabberlang is a client library to write XMPP client in Erlang. It can be used both a library or as Erlang behaviour. It allow to write XMPP services in Erlang. Can be used for inter Erlang programs communication. Several options for inter applications communications: term to binary <-> binary_to_term UBF ASN.1 22
23 Jabberlang features Auto registration Subscriptions management Roster management Message and IQ packet support 23
24 Jabberlang: Simple echo (library version) -module(xmpp_echo). -export([start/1, presence/4, message/7]). start(host) -> {ok, XMPP} = xmpp:start(host), xmpp:set_login_information(xmpp, "mremond",{password,"azerty"},"erlangecho"), xmpp:set_callback_module(xmpp,?module), xmpp:connect(xmpp). %% Ignore presence packets presence(_xmpp, _Type, _Attrs, _Elts) -> ok. %% Echo: Reply to messages with the same message message(xmpp, Type, From, Subject, Body, Attrs, _Elts) -> xmpp:message(xmpp, From, Type, Subject, Body). 24
25 Jabberlang: Simple echo (behaviour and attributes 1/2) -module(xmpp_echo_behaviour). -behaviour(gen_xmpp_client). %% XMPP configuration attributes -host("localhost"). -port(5222). -username("mremond"). -authentication({password,"azerty"}). -resource("erlang echo behaviour"). %% Optional: -include("xmpp.hrl"). %% Behaviour callbacks -export([init/2, presence/4, message/7]). -export([start/0]). 25
26 Jabberlang: Simple echo (behaviour and attributes 2/2) %% Module API start() -> gen_xmpp_client:start_link(?module, [], []). %% gen_xmpp_client callbacks init(args, State) -> {ok, State}. %% Ignore presence packets presence(_xmpp, _Type, _Attrs, _Elts) -> ok. %% Echo: Reply to messages with the same message message(xmpp, Type, From, Subject, Body, Attrs, _Elts) -> xmpp:message(xmpp, From, Type, Subject, Body). 26
27 Jabberlang: Simple echo (behaviour and no attributes 1/2) -module(xmpp_echo_behaviour2). -behaviour(gen_xmpp_client). %% Optional: -include("xmpp.hrl"). %% Behaviour callbacks -export([init/2, presence/4, message/7]). -export([start/0]). 27
28 Jabberlang: Simple echo (behaviour and no attributes 2/2) %% Module API start() -> Args = [ {host, "localhost"}, {port, 5222}, {username, "mremond"}, {authentication, {password, "azerty"}}, {resource, "Echo XMPP behaviour 2"}], gen_xmpp_client:start_link(?module, Args, []). %% gen_xmpp_client callbacks init(args, State) -> {ok, State}. %% Ignore presence packets presence(_xmpp, _Type, _Attrs, _Elts) -> ok. %% Echo: Reply to messages with the same message message(xmpp, Type, From, Subject, Body, Attrs, _Elts) -> xmpp:message(xmpp, From, Type, Subject, Body). 28
29 Using our simple echo client from a Jabber client 29
30 Erlang to Erlang communication through XMPP We launch the Erlang program two time as two differents resources The program receives messages, extracts Erlang term and increments the value and send it back to where it came from, and so on (ping pong). {ok, XMPP} = xmpp_erlang_example:start("ping"). {ok, XMPP2} = xmpp_erlang_example:start("pong"). xmpp_erlang_example:initialize_counter_pong(xmpp, 1). 30
31 Erlang to Erlang through XMPP 1/2 -module(xmpp_erlang_example). -behaviour(gen_xmpp_client). %% XMPP configuration attributes -host("localhost"). -username("mremond"). -authentication({password,"azerty"}). %% Optional: -include("xmpp.hrl"). %% Behaviour callbacks -export([init/2, presence/4, message/7]). -export([start/1, initialize_counter_pong/2]). %% Module API start(resource) -> gen_xmpp_client:start_link(?module, [{resource,resource}], []). initialize_counter_pong(xmpp, Counter) -> xmpp:message(xmpp, "chat", "", encode (Counter)). 31
32 Erlang to Erlang through XMPP 2/2 %% gen_xmpp_client callbacks init(args, State) -> {ok, State}. %% Ignore presence packets presence(_xmpp, _Type, _Attrs, _Elts) -> ok. %% Reply to increment message(xmpp, Type, From, Subject, Body, Attrs, _Elts) -> Value = decode(body), io:format("value: ~p~n", [Value]), xmpp:message(xmpp, From, Type, Subject, encode(value+1)). %% Take term and return encoded string encode(term) -> httpd_util:encode_base64(binary_to_list(term_to_binary(term))). %% Take String and return term decode(string) -> binary_to_term(list_to_binary(httpd_util:decode_base64(string))). 32
33 Extending the services offered by a standard Jabber server 33
34 J-EAI: an XMPP based integration tool J-EAI is an Enterprise Application Integration tool. It is intended to control and organize data streams in a given information system. It allow transformation, routing, queueing of all the data exchanges between applications in a given company or outside a company. 34
35 J-EAI: an XMPP based integration tool J-EAI supports handy features such as: Messages trace, to know what is exchanged between applications, Error message trace («hospital»), to be able to take actions upon message problems, Connectors to existing protocols and applications, Enhanced publish & subscribe mechanism, Full control from a central console, 35
36 Integrating XMPP with other applications 36
37 Integration in Web application XMPP can turn web applications into event-based systems. You are not anymore limited to pull mode. You can send events to the web browser. Those features are being implemented as browser extensions. Metafrog, a project tracker platform, will be the test-bed for this development approach: Go to Look at light bulbs 37
38 SIP and XMPP integration SIP / XMPP gateway: Running together ejabberd and yxa to share user base and presence information. Can provide: Integration between SIP and XMPP client. It could be possible to see if someone is one the phone from a Jabber client. Missed called or voice mail could be moved from the SIP protocol to other (mail or XMPP). 38
39 Using XMPP for Erlang distribution? Using XMPP for Erlang distribution could allow to develop distributed applications running through the Internet. This approach can solve some security aspects: Rosters configuration can decide if two process are allowed to exchanged messages. SSL is supported. Performance penalty: only relevant for non heavy-loaded critical message passing applications. Application design in such a way could switch to Erlang standard distribution to get more performance. 39
40 Thank you! Alexey Shchepin: Lead ejabberd developer Jonathan Bresler: Benchmarks Nicolas Niclausse: Benchmarks and lead Tsunami developer Christophe Romain: development on Erlang REPOS Thierry Mallard: Help for the conference Catherine Mathieu: Help for preparing the Erlang REPOS EUC 2004 CDROM 40
41 References Erlang REPOS CDROM (see Erlang-projects website) 41
42 Messaging with Erlang and Jabber Questions 42
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