geyser: add parent slot/blockhash to block

[fanatid]

Problem

Ability to construct full block with geyser interface.

https://docs.rs/solana-storage-proto/1.14.13/solana_storage_proto/convert/generated/struct.ConfirmedBlock.html
Currently we can construct all transactions from notify_transaction but we still need previous_blockhash + parent_slot.

There also a question, do I understand correctly that number of transactions in the block should be equal to executed_transaction_count?

Summary of Changes

Add previous_blockhash + parent_slot to ReplicaBlockInfoV2

[steviez]

@lijunwangs - Can you take this one?

[lijunwangs]

@fanatid There is a workaround, you can obtain the parent slot and its block hash from the slot notification.

With block, you can get the slot, from the slot notification interface, you can know the parent, and hence the parent hash as well.

There also a question, do I understand correctly that number of transactions in the block should be equal to executed_transaction_count?

Yes, with this number you can definitely know when all transaction for that block have been notified and received.

[lijunwangs]

Looks good. This can be piggy backed with the executed transaction count change and released together without introducing another version

[fanatid]

There is a workaround, you can obtain the parent slot and its block hash from the slot notification.

Yes, we can but we already collect transactions with a workaround. Block version will be changed anyway, so to have parent slot/blockhash would be good 🙂

Should I change something for green CI?

[steviez]

Should I change something for green CI?

Nope, flaky test and I just restart. However, I will defer merging the commit (once all greens) to @lijunwangs

[fanatid]

Awesome, thanks!