Solana: General ‘onLogs’ listener questions – listening on ‘processed’, ‘confirmed’ AND ‘finalized’

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Solana: General Questions for “onLogs” Listeners – Listening for “processed”, “confirmed” AND “completed”

As a Solana developer, you are probably aware of the importance of efficient and reliable transaction processing. One way to achieve this is to use listeners with transactions. A listener is a function that responds to certain events or messages after a transaction has been processed on the blockchain. In this article, we will explore some frequently asked questions related to Solana’s “onLogs” listener.

What are “onLogs” listeners?

OnSolana, also known as “onLogs,” is an event system that allows developers to create custom listeners to respond to certain events after a transaction has been processed on the blockchain. These listeners can be used to notify other applications about the status of a transaction, such as whether it was successful or failed.

Listening on ‘processed’

When listening to ‘processed’ events, you want to know that a transaction has been completed and its result is available. In Solana, this event is emitted when the transaction has been fully processed and confirmed by the node.

However, if you use the onProcessed listener, it will only be fired after all processing steps have been completed, which can lead to unnecessary delays or retries. To minimize latency, consider listening to confirmed’ events.

Listening onconfirmed

When listening toconfirmedevents, you want to know that the transaction has been successfully processed and its result is available. In Solana, this event is emitted when the transaction is completed and confirmed by the node.

Using theonConfirmedlistener can be a good option if you need to respond quickly after the transaction has started processing.

Using theonFinalized` listener can be a good option if you need to respond quickly after the transaction processing is complete.

Additional Considerations

Before choosing an event type, consider the following factors:

• Latency Requirements: If immediate response is critical, listen for ‘processed’ events.

• Event Order: Listen for ‘confirmed’ or ‘finalized’ events first to ensure the correct order of events.

• Additional Context: Consider including additional context with the outcome of your transaction to provide a more complete picture.

Conclusion

In conclusion, the Solana event system makes it easy to create custom listeners that respond to specific events after a transaction has been processed. By choosing the right event type and considering latency requirements, developers can build efficient and reliable transaction processing solutions on Solana.

If you are building a transaction solution for your application, be sure to explore the available event types and choose the best option for your use case.

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