CartoDB-SQL-API/app/models/formats

Format classes are required to expose a constructor with no arguments,

a getFileExtension() and a sendResponse(opts, callback) method.



The ``opts`` parameter contains:



 sink        Output stream to send the reponse to

 sql         SQL query requested by the user

 skipfields  Comma separate list of fields to skip from output

             really only needed with "SELECT *" queries

 gn          Name of the geometry column (for formats requiring one)

 dp          Number of decimal points of precision for geometries (if used)

 database    Name of the database to connect to

 user_id     Identifier of the user

 filename    Name to use for attachment disposition

 

The ``callback`` parameter is a function that is invoked when the

format object finished with sending the result to the sink.

If an error occurs the callback is invoked with an Error argument.