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120.2 How to develop inbound interface to consume message from Google Pub/Sub topic?

Learning Objectives:-

This unit describes:-

How to develop an Inbound interface to publish data into Google Pub/Sub topic?

Introduction: #

In this tutorial, we will learn how the Google Pub/Sub adapter works for the Inbound interface to publish data into the Google Pub/Sub topic. This functionality is available from v2.47 onwards. In simple words, Google Pub/Sub adapter to publish data means Inbound google pub/sub Adapter. We need an Inbound Google Pub/SubAdapter when we want to send data out from salesforce, here We need to create a topic first. Then we can publish data into Google Pub/Sub topic.
So now we are going to check the use cases for Inbound google Pub/Sub Adapter i.e, for Publisher. To configure, firstly we need to learn and follow some steps:
Authorize Google App with Cloud Pub/Sub API and Get Access Token
Step1: Now we have to create a project in the Google developer console. So follow the below step to do that.

Go to Google developer console. Hit the link- https://console.developers.google.com/cloud-resource-managerand create a project.

To create a new project we have to click on the “Create project link”.

Click on create button. Once the project is created we have to set credentials to our project. Follow the given steps to set credentials.
Click on the navigation menu.
Go to APIs& services.
Click credentials.

Click on create credentials button.

Select OAuth client Id from the list. Client ID: This is used to identify the application. … As per oAuth standard you need both Client ID & Client Secret along with user credentials to generate an access token. It’s the standard defined by OAuth.

Select Web application and give the name and click on create.

Authorization Scopes: #

Requires one of the following OAuth scopes:
https://www.googleapis.com/auth/pubsub
https://www.googleapis.com/auth/cloud-platform
Step2: For oAuth2 authentication with Google API, we need to visit developers.google.com. We should click on Link: – https://developers.google.com/oauthplayground/. And Select Drive API v3 and click on Authorize API.

[su_box title=”Note” box_color=”#2a8af0″ title_color=”#000000″]We should have our Google account, If not then create a new Google account. Once we select drive API then authorize it with our Google account.[/su_box]

When refresh token and Access token are generated then copy it and paste to notepad. (We need it later)

{
“access_token”: “ya29.a0AfH6SMB27Fc1tP6vIH7C5lswnK_J15tWMtGLaeb1bvbqQqYPBoRWT3gJbqkbhY8KsCag6tRJdyIJJADCFI3rrI9MmpxEAet2iM5nwiUhSABlQiDVcFsUYm5G9sZs40gsXU9XdDXRDAHzx_A1MRiXkjtWmNuiiwFM1lKzeHQ5Uew“,
“scope”: “https://www.googleapis.com/auth/pubsub https://www.googleapis.com/auth/cloud-platform”,
“token_type”: “Bearer”,
“expires_in”: 3599,
“refresh_token”: “1//04rm5yXZ6MX_vCgYIARAAGAQSNwF-L9IrgBSgkkKY8WQY2dfBYZ_txGpaSjPRs3hORqLnyrySgrgEmzmmK3nm-cGQ_I3ZbdZ_6Ug”
}
Step 2: Enable API(Follow the link given below)
https://cloud.google.com/pubsub/docs/quickstart-client-libraries?authuser=1

Set up a Cloud Console project.
Set up a project
Create or select a project.
Enable the Pub/Sub API for that project.

5. Install and initialize the Cloud SDK. [su_box title=”Note” box_color=”#2a8af0″ title_color=”#000000″]You can run the gcloud tool in the Cloud Console without installing the Cloud SDK. To run the gcloud tool in the Cloud Console, use Cloud Shell .[/su_box]
We can use Google cloud shell:
https://console.cloud.google.com/cloudpubsub/subscription/list?authuser=1&cloudshell=true&project=skyvva-278208
Quickstart using the gcloud command-line tool:
https://cloud.google.com/pubsub/docs/quickstart-cli

Step: 3 Create New Topic:
Example: gcloud pubsub topics create csvOutbound

Create New Subscription:
Example: gcloud pubsub subscriptions create csvOutboundSub –topic csvOutbound.

Publish messages:
Publish a message to my-topic: gcloud pubsub topics publish my-topic –message=”hello”
Receive messages:
Receive the message from my-sub: gcloud pubsub subscriptions pull my-sub –auto-ack
Publish Messages:
Example: gcloud pubsub topics publish csvOutbound –message=”hello world”

Receive Messages:
Example: gcloud pubsub subscriptions pull csvOutboundSub –auto-ack

Step: 4 Create Metadata provider, Repository, and Message type(Pre-Requisite)
Step: 5 Create Integration(Pre-Requisite)
Step: 6 Create Inbound Adapter.

Step 7: Create Inbound Interface
[su_box title=”Note” box_color=”#2a8af0″ title_color=”#000000″]Adapter must be linked with only 1 inbound or 1 outbound interface.1 topic must be linked with only 1 subscription.[/su_box]
Integration: Google_Integration
[su_box title=”Note” box_color=”#2a8af0″ title_color=”#000000″] CSV, JSON, and XML Inbound Examples: In Inbound case, we are sending data from Google pub/sub server side to Salesforce.[/su_box]