https://book.anchor-lang.com/ has no article on these yet, but I see many programs using them.
What is the problem that they are solving? What are the common code patterns and best practices for implementing and consuming events?
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2 Answers
What: log messages (anything you would do with msg!()). But they are not human readable as they are base64 encoded.
Why: msg!() with string formatting is relatively expensive for compute units
How: example
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In your example how can you extract the tx signature from the program call
program.rpc.initialize();that is wrapped in the Promise? Jan 6 at 9:07
They allow encoding of data into the transaction through the logs. They are more efficient that formatting a string (very expensive) and allow easy decoding through the anchor SDK
They can be used for:
- Notification
- Program activity tracking
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Thanks, that sort of answers the "what / why?" When you say "tracking," do you mean realtime tracking? Pubsub? How is this accomplished? Can you point me to any illustrative examples on implementation and consumption? Aug 16, 2022 at 12:50
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1I think it's websockets under the hood. But you can use Anchor's
Program.addEventListenerto subscribe to them on the client: coral-xyz.github.io/anchor/ts/classes/…– Callum MAug 16, 2022 at 13:19