Fog passes latest_block_version to clients in its responses
#1461
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This makes fog-ledger pass `latest_block_version` to clients in its responses when they do `KeyImage` checks or get merkle proofs. This will mean that they will get an update on this value when they do a balance check or before they submit a transaction, giving them a chance to potentially: * Pass the `latest_block_version` to the transaction builder, as envisioned in MCIP mobilecoinfoundation#26. * Maybe signal the need for an update if in the course of a balance check we learn that the block version has advanced beyond what our software was built to support. This is not a breaking change, this is just the part where fog communicates the `block_version` which is backwards compatible, so it is safe to merge at any time. The non-fog clients can already ask the ledger for the latest block version directly. We could add an API to consensus as well to get the latest block header, but it doesn't seem that it's a requirement right now so we didn't.
Co-authored-by: Remoun Metyas <[email protected]>
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Yeah i am a big believer in |
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LGTM but there is one thing I am wondering about:
We will be announcing the latest block version in the blockchain, but maybe we should also announce the maximum possible block version (e.g. there might be a period where only v1 blocks are getting into the chain, but v2 has already been implemented and is awaiting activation by a configuration flag and we want clients to start updating so that when v2 starts showing up they are aware of it).
I'm not sure if there's a non-janky way to expose that, since it's just a constant that will depend on a redeploy of the view server.
Yeah I'm not sure either -- I think it can't hurt to do that, and might give clients an extra opportunity to announce "there is an update available" or something like this |
…ion` This addresses a review suggestion from Eran
| #[derive(Clone, Eq, PartialEq, Message)] | ||
| pub struct QueryRequestAAD { | ||
| /// The first id of a user event to return. If you set this larger than 0, |
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love the new comments
This makes fog-ledger pass
latest_block_versionto clients inits responses when they do
KeyImagechecks or get merkle proofs.This will mean that they will get an update on this value when
they do a balance check or before they submit a transaction,
giving them a chance to potentially:
latest_block_versionto the transaction builder, asenvisioned in MCIP Block-Version-based Protocol Evolution mcips#26
check we learn that the block version has advanced beyond what
our software was built to support.
This is not a breaking change, this is just the part where fog
communicates the
block_versionwhich is backwards compatible,so it is safe to merge at any time.
The non-fog clients can already ask the local ledger for the latest
block version directly.
We could add an API to consensus as well to get the latest block
header, but it doesn't seem that it's a requirement right now
so we didn't.
We could also have piped this number through fog-view but we
decided not to, since it's more plumbing and it seems that as long
as the user gets this number at least once when they do a balance
check, then it's enough.