Invoke Cloud Functions

This quickstart shows you how to invoke a function that publishes a message constructed from the arguments that the function receives, using the Cloud Functions API.

Before you begin

Before you run this quickstart, make sure that you or your administrators have completed the following prerequisites:

  • Make sure that the Cloud Functions API is enabled in your Google Cloud project.

    Go to API library

  • Depending on the environment where your SAP system is hosted, set up authentication for invoking Cloud Functions. For instructions, see Authentication to invoke Cloud Functions. Configure the client keys as follows:

    • To access the Cloud Function endpoint, create a client key named DEMO-CF.
    • To invoke the Cloud Function, create a client key named DEMO-CF-INVOKER.

  • In the Google Cloud console, write a 2nd gen HTTP function, cf-gen2-hello-with-args, that publishes a message using the provided arguments:

        exports.helloWorld = (req, res) => {
    let name = req.body.name || req.query.name;
    let full_name = `${req.body.firstname} ${req.body.lastname}`;
    res.status(200).send(`Hello ${name}! Full Name: ${full_name}`);
  };

    For information about how to write HTTP functions, see Write Cloud Functions.

Create a program to invoke Cloud Functions

  1. In the SAP system, create an executable program in your custom namespace (for example, Z or Y) by using transaction SE38.

    1. In the SAP GUI, enter transaction code SE38.

    2. In the Program field, enter a name of your program. For example, ZDEMO_CLOUDFUNC_INVOKER.

    3. Click Create.

    4. Specify the program attributes:

      1. In the Title field, enter a title of your program, for example, Invoke Cloud Function using Cloud Function Invoker.

      2. In the Type field, choose Executable Program.

      3. Click Save.

    5. Save the program as a Local Object.

    6. In the ABAP Editor, add the following code:

      **********************************************************************
*  Copyright 2024 Google LLC                                         *
*                                                                    *
*  Licensed under the Apache License, Version 2.0 (the "License");   *
*  you may not use this file except in compliance with the License.  *
*  You may obtain a copy of the License at                           *
*      https://www.apache.org/licenses/LICENSE-2.0                   *
*  Unless required by applicable law or agreed to in writing,        *
*  software distributed under the License is distributed on an       *
*  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,      *
*  either express or implied.                                        *
*  See the License for the specific language governing permissions   *
*  and limitations under the License.                                *
**********************************************************************
REPORT zr_qs_cfinvoker.

DATA(lv_cf_name)  = CONV string( 'cf-gen2-hello-with-args' ).
DATA(lv_msg)      = CONV string( '{"firstname": "John", "lastname" : "Doe"}' ).


TRY.
    " Create a Client API stub for Cloud Functions
    DATA(lo_cloudfunc_client) = NEW /goog/cl_cloudfunc_v2( iv_key_name   = 'DEMO_CF' ).
    " Create a Client API stub for Cloud Function Invoker.
    " Internally this uses the Cloud Function instance to fetch the cloud function HTTP endpoint
    DATA(lo_cfinvoker_client) = NEW /goog/cl_cloudfunc_invoker( iv_key_name   = 'DEMO_CF_INVOKER' ).

    " Send additional query parameters as inputs to the cloud function.
    lo_cfinvoker_client->add_common_qparam( iv_name  = 'name'
                                            iv_value = 'Johnny' ).

    lo_cfinvoker_client->invoke(
      EXPORTING
        iv_cf_name      = lv_cf_name            "Cloud Function Name
        iv_cf_location  = 'us-central1'         "Location where the Cloud Function is hosted
        io_cf_instance  = lo_cloudfunc_client   "Instance of cloud Function Client API Stub
        iv_body         = lv_msg                "Input payload to the Cloud Function
        iv_content_type = 'application/json'
        iv_method       = 'POST'
      IMPORTING
        es_output       = DATA(lv_output)
        ev_ret_code     = DATA(lv_ret_code)
        ev_err_text     = DATA(lv_err_text)
        es_err_resp     = DATA(ls_err_resp)
    ).

    IF lo_cfinvoker_client->is_success( iv_code = lv_ret_code ).
      WRITE: / 'HTTP Return Code:', lv_ret_code.
      WRITE: / 'Response:', lv_output. "Output of cloud function
    ELSE.
      WRITE: / 'HTTP Return Code:', lv_ret_code.
      WRITE: / 'Error:', lv_err_text.
    ENDIF.

  CATCH /goog/cx_sdk INTO DATA(lo_exp).
    WRITE: / lo_exp->get_text( ).
ENDTRY.

    Replace the following:

    • DEMO_CF: name of the client key that is used to access the Cloud Function endpoint.
    • DEMO_CF_INVOKER: name of the client key that is used to invoke the Cloud Function.

  2. Run your application in SE38. If successful, the following output displays:

     HTTP Return Code:        200
 Response: Hello Johnny! Full Name: John Doe

What's next