Difference between revisions of "Xebra Module Communication Protocol"
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[[Category:Xebra]]
 
[[Category:Xebra]]
 +
[[Xebra About|About]] | [[Xebra Installation|Installation]] |  [[Xebra Documentation|Documentation]] |  [[Xebra Tutorial|Tutorials]] | [[Xebra FAQ|Frequently Asked Questions]]
 +
  
 
=Basic Communication=
 
=Basic Communication=
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For every request, the module sends a message of the following format to the server:
 
For every request, the module sends a message of the following format to the server:
 
<code>
 
<code>
−
REQUEST = (GET_HEADER HEADERS_IN HEADERS_OUT SUBPROCESS_ENVIRONMENT_VARS GET_ARGUMENTS)
+
REQUEST = HEADER HEADERS_IN HEADERS_OUT SUBPROCESS_ENVIRONMENT_VARS ARGS;
−
        | (POST_HEADER HEADERS_IN HEADERS_OUT SUBPROCESS_ENVIRONMENT_VARS POST_ARGUMENTS) ;
+
  
−
GET_HEADER = "GET" HEADER;
+
HEADER = KEY_METHOD KEY_SPACE url KEY_SPACE KEY_HTTP;  
−
POST_HEADER = "POST" HEADER;
+
HEADERS_IN = KEY_HI {TABLE_ENTRY}  KEY_END;
−
HEADER = " " url " HTTP/1.1";
+
HEADERS_OUT = KEY_HO {TABLE_ENTRY} KEY_END;
 +
SUBPROCESS_ENVIRONMENT_VARS = KEY_SE TABLE_ENTRIES KEY_END;
 +
TABLE_ENTRY = KEY_T_NAME item_name KEY_T_VALUE item_value;
 +
ARGS = KEY_ARG args;
 +
 +
 +
KEY_METHOD = "GET" | "POST";
 +
KEY_HTTP = "HTTP/1.1" | "HTTP/1.0";
 +
KEY_SPACE = " ";
 +
KEY_HI = "#HI#";
 +
KEY_HO = "#HO#";
 +
KEY_END = "#E#";
 +
KEY_SE = "#SE#";
 +
KEY_T_NAME = "#$#";
 +
KEY_T_VALUE = "#%#";
 +
KEY_ARG = "#A#";
 +
</code>
  
−
HEADERS_IN = "#HI#"  {"#$#" item_name "#%#" item_value}  "#E#";
 
−
HEADERS_OUT = "#HO#"  {"#$#" item_name "#%#" item_value}  "#E#";
 
−
SUBPROCESS_ENVIRONMENT_VARS = "#SE#"  {"#$#" item_name "#%#" item_value}  "#E#";
 
  
−
GET_ARGUMENTS = "#A#"  {"$" arg_name "=" arg_value}  "#E#";
+
==Example==
−
POST_ARGUMENTS = "#A##CT#" content_type "#CTE#"  (TABLE_POST_DATA | post_data) "#E#";
+
−
TABLE_POST_DATA = {"$" arg_name "=" arg_value};
+
  
 +
GET request with arguments
  
 +
<code>
 +
GET /test.xeb?name=admin&password=plain_text&login=true HTTP/1.1#HI##$#Host#%#localhost:55000#$#User-Agent#%#Mozilla/5.0 (X11; U; Linux x86_64; en; rv:1.9.0.11) Gecko/20080528 Epiphany/2.22 Firefox/3.0#$#Accept#%#text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8#$#Accept-Language#%#en-us,en;q=0.5#$#Accept-Encoding#%#gzip,deflate#$#Accept-Charset#%#ISO-8859-1,utf-8;q=0.7,*;q=0.7#$#Keep-Alive#%#300#$#Connection#%#keep-alive#E##HO##E##SE##E##A#&name=admin&password=plain_text&login=true
 
</code>
 
</code>
  
−
==Example==
+
GET request with cookies
 +
 
 
<code>
 
<code>
 +
GET /demoapplication/reservations.xeb HTTP/1.1#HI##$#Host#%#localhost:55000#$#User-Agent#%#Mozilla/5.0 (X11; U; Linux x86_64; en; rv:1.9.0.11) Gecko/20080528 Epiphany/2.22 Firefox/3.0#$#Accept#%#text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8#$#Accept-Language#%#en-us,en;q=0.5#$#Accept-Encoding#%#gzip,deflate#$#Accept-Charset#%#ISO-8859-1,utf-8;q=0.7,*;q=0.7#$#Keep-Alive#%#300#$#Connection#%#keep-alive#$#Referer#%#http://localhost:55000/demoapplication/reservations.xeb#$#Cookie#%#xuuid=1B9314C9-B147-406C-BB80-7E9572D53B18; place=eiffelstudio, hollister avenue #3 =her; webapp=demoapplication; 123=46; asldasda=asdasd#E##HO##E##SE##E##A#
 +
</code>
  
 +
POST request with form arguments
 +
 +
<code>
 +
POST /test.xeb HTTP/1.1#HI##$#Host#%#10.0.10.117:55000#$#Connection#%#keep-alive#$#User-Agent#%#Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/530.5 (KHTML, like Gecko) Chrome/2.0.172.33 Safari/530.5#$#Content-Length#%#48#$#Cache-Control#%#max-age=0#$#Origin#%#file://#$#Content-Type#%#application/x-www-form-urlencoded#$#Accept#%#application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5#$#Accept-Encoding#%#gzip,deflate,bzip2,sdch#$#Accept-Language#%#de-DE,de;q=0.8,en-US;q=0.6,en;q=0.4#$#Accept-Charset#%#ISO-8859-1,utf-8;q=0.7,*;q=0.3#E##HO##E##SE##E##A#&name=wer&test=on&hiddenField=first&submit=Submit
 +
</code>
 +
 +
XML-RPC POST request
 +
 +
<code>
 +
POST /xmlrpc_demo/demo.xrpc HTTP/1.0#HI##$#Host#%#localhost:55000#$#User-Agent#%#xmlrpclib.py/1.0.1 (by www.pythonware.com)#$#Content-Type#%#text/xml#$#Content-Length#%#192#E##HO##E##SE##E##A#&<?xml version='1.0'?>
 +
<methodCall>
 +
<methodName>demo.sum</methodName>
 +
<params>
 +
<param>
 +
<value><int>4</int></value>
 +
</param>
 +
<param>
 +
<value><int>5</int></value>
 +
</param>
 +
</params>
 +
</methodCall>
 
</code>
 
</code>
  
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==Example==
 
==Example==
 
<code>
 
<code>
−
 
+
#C#xuuid=0C580662-6ED1-4166-9084-7272E426CE63;Max-Age=1000;Version=1#CE##CT#text/html;charset=ascii#H#<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 +
<html xmlns="http://www.w3.org/1999/xhtml">
 +
<head>
 +
<title>Xebra Server Control</title>
 +
</head>
 +
<body>
 +
hello
 +
</body>
 +
</html>
 
</code>
 
</code>

Latest revision as of 14:04, 10 August 2009

About | Installation | Documentation | Tutorials | Frequently Asked Questions


Basic Communication

For every string message that is to be sent between a module and server, the sender first sends the length of the message ENCODED_MESSAGE_LENGTH and then the message MESSAGE. The max length FRAG_SIZE of a message to be sent is 65536 bytes. If a message is longer, it is divided into fragments. ENCODED_MESSAGE_LENGTH is called ENCODED_ because it also contains a FRAG_FLAG which specifies if the next message is a fragment and has to be assembled to a whole message after receiving.

Let's say the server wants so send a message of size 150'000 bytes to the module. The following would be sent: [65536 FRAG_FLAG=1][Message part 1...][65536 FRAG_FLAG=1][Message part 2....][18928 FRAG_FLAG=0][Message part 3....]

The ENCODED_MESSAGE_LENGTH is constructed as follows: The lenght of the message (integer) is shifted by 1 bit to the left. Then the most right bit is set to FRAG_FLAG.

Request Message

For every request, the module sends a message of the following format to the server: 

REQUEST = HEADER HEADERS_IN HEADERS_OUT SUBPROCESS_ENVIRONMENT_VARS ARGS;
 
HEADER = KEY_METHOD KEY_SPACE url KEY_SPACE KEY_HTTP; 
HEADERS_IN = KEY_HI {TABLE_ENTRY}  KEY_END;
HEADERS_OUT = KEY_HO {TABLE_ENTRY} KEY_END;
SUBPROCESS_ENVIRONMENT_VARS = KEY_SE TABLE_ENTRIES KEY_END;
TABLE_ENTRY = KEY_T_NAME item_name KEY_T_VALUE item_value;
ARGS = KEY_ARG args;
 
 
KEY_METHOD = "GET" | "POST";
KEY_HTTP = "HTTP/1.1" | "HTTP/1.0";
KEY_SPACE = " ";
KEY_HI = "#HI#";
KEY_HO = "#HO#";
KEY_END = "#E#";
KEY_SE = "#SE#";
KEY_T_NAME = "#$#";
KEY_T_VALUE = "#%#";
KEY_ARG = "#A#";


Example

GET request with arguments 

GET /test.xeb?name=admin&password=plain_text&login=true HTTP/1.1#HI##$#Host#%#localhost:55000#$#User-Agent#%#Mozilla/5.0 (X11; U; Linux x86_64; en; rv:1.9.0.11) Gecko/20080528 Epiphany/2.22 Firefox/3.0#$#Accept#%#text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8#$#Accept-Language#%#en-us,en;q=0.5#$#Accept-Encoding#%#gzip,deflate#$#Accept-Charset#%#ISO-8859-1,utf-8;q=0.7,*;q=0.7#$#Keep-Alive#%#300#$#Connection#%#keep-alive#E##HO##E##SE##E##A#&name=admin&password=plain_text&login=true

GET request with cookies 

GET /demoapplication/reservations.xeb HTTP/1.1#HI##$#Host#%#localhost:55000#$#User-Agent#%#Mozilla/5.0 (X11; U; Linux x86_64; en; rv:1.9.0.11) Gecko/20080528 Epiphany/2.22 Firefox/3.0#$#Accept#%#text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8#$#Accept-Language#%#en-us,en;q=0.5#$#Accept-Encoding#%#gzip,deflate#$#Accept-Charset#%#ISO-8859-1,utf-8;q=0.7,*;q=0.7#$#Keep-Alive#%#300#$#Connection#%#keep-alive#$#Referer#%#http://localhost:55000/demoapplication/reservations.xeb#$#Cookie#%#xuuid=1B9314C9-B147-406C-BB80-7E9572D53B18; place=eiffelstudio, hollister avenue #3 =her; webapp=demoapplication; 123=46; asldasda=asdasd#E##HO##E##SE##E##A#

POST request with form arguments 

POST /test.xeb HTTP/1.1#HI##$#Host#%#10.0.10.117:55000#$#Connection#%#keep-alive#$#User-Agent#%#Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/530.5 (KHTML, like Gecko) Chrome/2.0.172.33 Safari/530.5#$#Content-Length#%#48#$#Cache-Control#%#max-age=0#$#Origin#%#file://#$#Content-Type#%#application/x-www-form-urlencoded#$#Accept#%#application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5#$#Accept-Encoding#%#gzip,deflate,bzip2,sdch#$#Accept-Language#%#de-DE,de;q=0.8,en-US;q=0.6,en;q=0.4#$#Accept-Charset#%#ISO-8859-1,utf-8;q=0.7,*;q=0.3#E##HO##E##SE##E##A#&name=wer&test=on&hiddenField=first&submit=Submit

XML-RPC POST request 

POST /xmlrpc_demo/demo.xrpc HTTP/1.0#HI##$#Host#%#localhost:55000#$#User-Agent#%#xmlrpclib.py/1.0.1 (by www.pythonware.com)#$#Content-Type#%#text/xml#$#Content-Length#%#192#E##HO##E##SE##E##A#&<?xml version='1.0'?>
<methodCall>
<methodName>demo.sum</methodName>
<params>
<param>
<value><int>4</int></value>
</param>
<param>
<value><int>5</int></value>
</param>
</params>
</methodCall>

Response Message

The server answers with a response message of the following format: 

RESPONSE = {COOKIE_ORDER} CONTENT_TYPE HTML;
COOKIE_ORDER = "#C#" cookie_name "=" cookie_value COOKIE_OPT ";Version=1#CE#";
COOKIE_OPT = [";" "Domain=" cookie_domain]
             [";" "Max-Age=" cookie_max_age]  
             [";" "Path=" cookie_path]
             [";" "Secure"];
CONTENT_TYPE = "#CT#" content_type;
HTML = "#H#" html_code;

Example

#C#xuuid=0C580662-6ED1-4166-9084-7272E426CE63;Max-Age=1000;Version=1#CE##CT#text/html;charset=ascii#H#<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head>
<title>Xebra Server Control</title>
</head>
<body>
hello
</body>
</html>
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