Este exemplo de código pode ser usado para receber mensagens que foram publicadas em um tópico do Pub/Sub usando uma assinatura.
Para acessar uma coleção abrangente de exemplos de código do ABAP SDK for Google Cloud, acesse o repositório GoogleCloudPlatform/google-cloud-abap/abap-sdk /ZGOOG_SDK_DOCS_SAMPLES no GitHub.
Exemplo de código
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REPORT zr_pull_subscriptions.
DATA:
lv_p_projects_id TYPE string,
lv_p_subscriptions_id TYPE string,
ls_input TYPE /goog/cl_pubsub_v1=>ty_026,
ls_input_ack TYPE /goog/cl_pubsub_v1=>ty_001.
TRY.
* Open HTTP Connection
DATA(lo_client) = NEW /goog/cl_pubsub_v1( iv_key_name = 'CLIENT_KEY' ).
* Populate relevant parameters
" Derive project id from the client object
lv_p_projects_id = lo_client->gv_project_id.
" Name of the subscription from where we want to pull data
lv_p_subscriptions_id = 'SAMPLE_SUBSCRIPTION'.
" Max number of messages that will be received in 1 API call
ls_input-max_messages = 1.
* Call API method
CALL METHOD lo_client->pull_subscriptions
EXPORTING
iv_p_projects_id = lv_p_projects_id
iv_p_subscriptions_id = lv_p_subscriptions_id
is_input = ls_input
IMPORTING
es_output = DATA(ls_output)
ev_ret_code = DATA(lv_ret_code)
ev_err_text = DATA(lv_err_text)
es_err_resp = DATA(ls_err_resp).
IF /goog/cl_http_client=>is_success( lv_ret_code ).
IF ls_output-received_messages IS NOT INITIAL.
"Messages published to Pub/Sub should be base-64 encoded, hence in order to get the exact message, we need to decode the data field.
"However, attributes published to Pub/Sub should be accessible without any additional logic.
DATA(lv_msg) = | Message Received: { cl_http_utility=>decode_base64( encoded = ls_output-received_messages[ 1 ]-message-data ) }|.
APPEND ls_output-received_messages[ 1 ]-ack_id TO ls_input_ack-ack_ids.
* Call API method: pubsub.projects.subscriptions.acknowledge
"Acknowledge the messages so it is not pulled again.
CALL METHOD lo_client->acknowledge_subscriptions
EXPORTING
iv_p_projects_id = lv_p_projects_id
iv_p_subscriptions_id = lv_p_subscriptions_id
is_input = ls_input_ack
IMPORTING
es_output = DATA(ls_output_ack)
ev_ret_code = lv_ret_code
ev_err_text = lv_err_text
es_err_resp = ls_err_resp.
IF lo_client->is_success( lv_ret_code ).
MESSAGE lv_msg TYPE 'S'.
ELSE.
MESSAGE lv_err_text TYPE 'E'.
ENDIF.
ELSE.
MESSAGE 'No Messages were received!' TYPE 'S'.
ENDIF.
ELSE.
MESSAGE lv_err_text TYPE 'E'.
ENDIF.
* Close HTTP Connection
lo_client->close( ).
CATCH /goog/cx_sdk INTO DATA(lo_exception).
MESSAGE lo_exception->get_text( ) TYPE 'E'.
ENDTRY.