To ingest events using Google PubSub, follow the steps outlined below:
1

Create a PubSub Topic

create google pubsub topic
2

Create a Subscription

create a subscription
3

Create a Service Account with PubSub Admin Role

create service account
4

Generate Service Account JSON Key

generate service account json key
5

Configure Source

Supply your Project ID, Topic Name, Subscription and upload your service account json key.
6

Ingest Events

Continue to the next section to see how to format the event payload.

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Ingestion Options

There are two ways to ingest events into Convoy from Google PubSub:
  • Format the payload using the structure below as a guide and write it to your topic.
    reference payload
     {
    "event_type": "string, required",
    "data": "object, required",
    "custom_headers": { // optional
        "x-convoy-message-type": "single",
        "sample-header": "sample-value"
    },
    "idempotency_key": "string, optional",
    "owner_id": "string, optional", // if included, the event is sent to all endpoints with the owner-id
    "endpoint_id": "string, optional" // if included, the event is sent to a single endpoint
 }
    If x-convoy-message-type set to broadcast, the event will be sent to all endpoints in the project, ignoring both the endpoint_id and owner_id values.
For a full list of reference payloads, see our guide on ingesting events
  • Send your arbitrarily formatted event payloads to your topic and use Convoy’s transform functions to mutate them at the point of ingestion.
    transform function
    function transform(payload) {
    return {
        "endpoint_id": "",
        "owner_id": "",
        "event_type": "sample",
        "data": payload, // payload contains arbitrary message data read from your queue
        "custom_headers": {
            "sample-header": "sample-value"
        },
        "idempotency_key": ""
    }
}

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Things to note

  • Messages are read of the PubSub topic in chunks by each worker.
  • Acknowledgements are done automatically, this is handled by Google’s Go library.