Google Storage for Developers API (GET / PUT files using ABAP)

[Former Member]

Does anyone have any experience using Google's Storage API from SAP/ABAP ?

We have a requirement to put files (txt, xls, etc.) out to Google Storage.

Here's a link with an overview of Google Storage:

http://code.google.com/apis/storage/docs/overview.html

Here's a link explaining the HTTP methods used:

http://code.google.com/apis/storage/docs/reference-methods.html#putobject

Unfortunately we do not have much in-house Java/Web development experience. We do have some experience with the "http_client" methods in SAP, but not the GET/PUT concept to push/receive files.

Does anyone have experience using SAP/ABAP to accomplish this requirement?

Anyone have any sample ABAP code which would illustrate how to put a simple TXT file out to Google Storage?

Thanks very kindly,

Chris

[mvoros]

Hi,

I haven't worked with Google Storage but I wrote a really simple class for working with CouchDB. Both products use REST based API so there should not be a big difference between them. Don't expect too much cause I spent just 1 hour on it but it might help you. The class cl_http_client is pretty straighforward so you shouldn't have any problems to add additional things required by Google.

Basically, I have one main method called SEND with three parameters METHOD, URL and DATA (all parameters have type string).

  DATA: full_url TYPE string,
        client TYPE REF TO if_http_client.

* Create HTTP Client
  CONCATENATE 'http://' me->host ':' me->port url
    INTO full_url.
  CALL METHOD cl_http_client=>create_by_url
    EXPORTING
      url                = full_url
    IMPORTING
      client             = client
    EXCEPTIONS
      argument_not_found = 1
      plugin_not_active  = 2
      internal_error     = 3
      OTHERS             = 4.

  IF sy-subrc <> 0.
* XXX
  ENDIF.

  IF NOT data IS INITIAL.
    client->request->append_cdata( data ).
  ENDIF.
  client->request->set_method( method ).
  client->send( ).
  client->receive( ).
  result = client->response.

Prety simple, you just need to enter method (GET,PUT,POST,DELETE) and URL. The parameter DATA is optional. Here is an example how I use my class.

* Get connection
  couch =  zcl_couchdb=>getcouchdb( ).
  result = couch->send( method = 'GET' url = '/' ).
  txt = result->get_cdata( ).
  WRITE: / txt.
  result = couch->send( method = 'GET' url = '/_all_dbs' ).
  txt = result->get_cdata( ).
  WRITE: / txt.

* Create DB
  result = couch->send( method = 'PUT' url = '/test' ).
  txt = result->get_cdata( ).
  WRITE: / txt.
  result = couch->send( method = 'GET' url = '/_all_dbs' ).
  txt = result->get_cdata( ).
  WRITE: / txt.

* Create a new document
  result = couch->send( method = 'PUT' url = '/test/123' data = '{"_id":"123","data":"Foo"}' ).
  txt = result->get_cdata( ).
  WRITE: / txt.

* Get back document 123
  result = couch->send( method = 'GET' url = '/test/123').
  txt = result->get_cdata( ).
  WRITE: / txt.