EasyGen

Welcome to the world of randomness! EasyGen is a very simple DSL to generate arbitrary amount of string data with ease.All you need to do is, write your DSL into a file and pass file path to this program.Currently the generated data can be written to file, standard output or socket.

How to build

From the project folder run bellow commands to build and run the project:

mvn clean package
java -jar Generator-1.0-SNAPSHOT-jar-with-dependencies.jar YOUR_DSL_FILE_PATH

Quick start

Example 1:
The following example create a CSV file that has 5 headers ( UserEmailAddress , UserIP , DestinationIP , VisitedUrl , Date ) and store 100 records of random generated data to a file ( /tmp/output.csv ) :

DEFINE( IP AS [0..255].[0..255].[0..255].[0..255] )
DEFINE( URL AS [http|https]:// REP( [a..z] , 3 , 20 ).[com|org|net] )
DEFINE( Email AS REP([a..z],1,20)@[gmail|yahoo|msn].com )
DEFINE( COMMA AS ' , ' )

FILE (
	'UserEmailAddress , UserIP , DestinationIP , VisitedUrl , Date' NEW_LINE()
	REP(
		Email COMMA IP COMMA IP COMMA URL COMMA DATE() NEW_LINE()	
	, 100 )
, /tmp/output.csv)

Example 2:
To output a table like bellow to the console :

--------------------------------------------------------------------------------
|UserID            |Username           |Password           |RegisterDate       |
--------------------------------------------------------------------------------
|1                 |wmOsTk             |dsaThwKnoWePoACcEC |3/29/15 2:26 AM    |
--------------------------------------------------------------------------------
|2                 |xnozxgHao          |QkEwuX             |7/29/82 8:04 AM    |
--------------------------------------------------------------------------------
|3                 |fkKLpkDUj          |NEIXIyshWWukmso    |4/15/02 9:56 PM    |
--------------------------------------------------------------------------------
|4                 |FPIkm              |BbZbliZALcdV       |2/8/98 5:01 AM     |
--------------------------------------------------------------------------------
|5                 |vgFWVMwWJ          |qkBZjHAL           |2/7/12 8:07 PM     |
--------------------------------------------------------------------------------
|6                 |kzTwL              |jpHQdBzrHW         |2/15/11 1:23 AM    |
--------------------------------------------------------------------------------

you can write:

DEFINE( DRAW_LINE AS REP('-',80) NEW_LINE() )
DEFINE( ID AS IDENTITY(1,1) )
DEFINE( username AS REP([a..z]+[A..Z],3,18) )
DEFINE( Pwd AS REP([a..z]+[A..Z],3,18) )

CONSOLE(

	DRAW_LINE
	'|' PAD_RIGHT(UserID,18,' ') '|' PAD_RIGHT(Username,19,' ') '|' PAD_RIGHT(Password,19,' ') '|' PAD_RIGHT(RegisterDate,19,' ') '|' NEW_LINE()
	DRAW_LINE

	REP(
		'|' PAD_RIGHT(ID,18,' ') '|' PAD_RIGHT(username,19,' ') '|' PAD_RIGHT(Pwd,19,' ') '|' PAD_RIGHT(DATE(),19,' ') '|' NEW_LINE()
		DRAW_LINE
	, 6)
)

Example 3:
To generate 25 random number between -500 to 500, in 5 rows and 5 columns, and output the result to both console and file you can write :

DEFINE( RAND_NUM AS [-500..500] )

FILE (
	CONSOLE (

		REP(
			REP(
				PAD_RIGHT(RAND_NUM,8,' ') TAB()
			, 5 )
			NEW_LINE()
		, 5)
	)
, /tmp/output.txt )

The output is something like this :

-367    	-259    	189     	200     	340     	
-295    	-240    	146     	234     	-325    	
-387    	-147    	3       	405     	-458    	
-132    	-369    	363     	-306    	-249    	
265     	-135    	466     	-117    	-250

Example 4:
An example of sending the data to a socket.For example to send 100 metrics to OpenTSDB you can write:

DEFINE( TSD_ADDRESS AS 127.0.0.1:5140 )

REP(

	SOCKET(
		'put sys.cpu.user 149'[1190000000..1209999999] ' ' [10..100].[0..9] ' ' host=webserver PAD_LEFT([0..20],2,'0') ' ' cpu=[0..15] NEW_LINE()
        , TSD_ADDRESS)

, 100 )	

It will send metrics to OpenTSDB that is like :

put sys.cpu.user 1491209684404 87.4 host=webserver08 cpu=4
put sys.cpu.user 1491199717808 99.0 host=webserver08 cpu=1
put sys.cpu.user 1491199318893 33.7 host=webserver09 cpu=14
put sys.cpu.user 1491200493212 30.9 host=webserver07 cpu=12
put sys.cpu.user 1491196496576 70.1 host=webserver10 cpu=10

which is valid OpenTSDB syntax.

DSL Syntax

• Ranges
  • LongRange
  • CharRange
  • Range Unions
  • Range Complements
  • StringRange
• Static data
• Repetition
• Functions
  • NEW_LINE()
  • TAB()
  • REP( expression , number )
  • REP( expression , min_number , max_number )
  • TODAY()
  • TODAY( pattern )
  • DATE()
  • DATE( startDate )
  • DATE( startDate , outputPattern )
  • DATE( startDate , endDate , outputPattern )
  • TIMESTAMP()
  • TIMESTAMP(from)
  • TIMESTAMP(from,to
  • PAD_LEFT( expression , minLength , fillChar )
  • PAD_RIGHT( expression , minLength , fillChar )
  • Unique Identifier
    • IDENTITY( seed , increment )
    • MD2()
    • MD5()
    • SHA1()
    • SHA256()
    • SHA512()
• Output
  • CONSOLE
  • FILE
  • SOCKET( expression , host:port )

Add to your project

You can reference to this library by either of java build systems (Maven, Gradle, SBT or Leiningen) using snippets from this jitpack link: