Unable to process events from azure EventHub after adding blob storage - azure-blob-storage

Question

The simple receiver function was working fine, but I was reading all the events again if the service restarts. To mitigate this added blob storage support for checkpoints.
After adding checkpointStore in the new EventHubConsumerClient it is not reading anything just logs "start event hub subscription"
const consumerClient = new EventHubConsumerClient(
consumerGroup,
connectionString,
eventHubName,
checkpointStore,
)
Am I missing something? Why is it not reaching to processEvents?
import { EventHubConsumerClient, CheckpointStore } from '#azure/event-hubs';
import { ContainerClient } from '#azure/storage-blob';
import { BlobCheckpointStore } from '#azure/eventhubs-checkpointstore-blob';
export async function startReceiverEventService() {
console.log(`Running receiveEvents sample`);
const connectionString = process.env.EVENTHUB_CONNECTION_STRING;
const eventHubName = process.env.EVENTHUB_NAME;
const consumerGroup = process.env.CONSUMER_GROUP_NAME;
const storageConnectionString = process.env.STORAGE_CONNECTION_STRING;
const containerName = process.env.STORAGE_CONTAINER_NAME;
const containerClient = new ContainerClient(
storageConnectionString,
containerName,
);
if (!(await containerClient.exists())) {
await containerClient.create();
}
/** Checkpoints for data consumed */
const checkpointStore: CheckpointStore = new BlobCheckpointStore(
containerClient,
);
/** Consumer connrection */
const consumerClient = new EventHubConsumerClient(
consumerGroup,
connectionString,
eventHubName,
checkpointStore,
);
console.log(' start event hub subscription ');
/** Subscribing the events */
const subscription = consumerClient.subscribe({
processEvents: async (events, context) => {
console.log('processing events -');
/**
* Note: It is possible for `events` to be an empty array.
* This can happen if there were no new events to receive
* in the `maxWaitTimeInSeconds`, which is defaulted to
* 60 seconds.
* The `maxWaitTimeInSeconds` can be changed by setting
* it in the `options` passed to `subscribe()`.
*/
for (const event of events) {
const data = JSON.stringify(event.body);
console.log(
`Received event: '${data}' from partition: '${context.partitionId}' and consumer group: '${context.consumerGroup}'`,
);
// TODO: have to do futher task here
}
try {
// save a checkpoint for the last event now that we've processed this batch.
await context.updateCheckpoint(events[events.length - 1]);
} catch (err) {
console.log(
`Error when checkpointing on partition ${context.partitionId}: `,
err,
);
throw err;
}
console.log(
`Successfully checkpointed event with sequence number: ${
events[events.length - 1].sequenceNumber
} from partition: '${context.partitionId}'`,
);
},
processError: async (err, context) => {
console.log(`Error : ${err}`);
},
});
}