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nit from mvines review.

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Godmode Galactus 2023-04-18 10:16:32 +02:00
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proposals/0047-last-hard-fork-syscall.md
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@ -25,22 +25,22 @@ stakes, the restart is successful, and the cluster continues from the hard fork
slot. So hard fork is a tool to intentionally fork off the nodes not slot. So hard fork is a tool to intentionally fork off the nodes not
participating in the restart effort. participating in the restart effort.
Dapp developers may find it useful to know that a hard fork has recently Program developers may find it useful to know that a hard fork has recently
occurred. This information can help them prevent arbitrage and liquidation occurred. This information can help them prevent arbitrage and liquidation
caused by outdated oracle price account states. However, the cluster's restart caused by outdated oracle price account states. However, the cluster's restart
process takes several hours; in that time, the world can change, causing asset process takes several hours; in that time, the world can change, causing asset
prices to fluctuate. As the cluster updates the state of all accounts, prices to fluctuate. As the cluster updates the state of all accounts, malicious
malicious actors could take advantage of the delay by conducting trades using actors could take advantage of the delay by conducting trades using outdated
outdated prices, anticipating that they will soon catch up to the actual prices, anticipating that they will soon catch up to the actual prices of
prices of real-world assets. Knowing that hard fork has been done recently, real-world assets. Knowing that hard fork has been done recently, programs can
dapps can manage these cases more appropriately. manage these cases more appropriately.
## Alternatives Considered ## Alternatives Considered
No alternate considerations; we need to have the value of last hard fork slot No alternate considerations; we need to have the value of last hard fork slot
while executing the dapp to correctly treat this case. We cannot have an account while executing the program to correctly treat this case. We cannot have an
because then it should be updated just after the restart is successful, which account because then it should be updated just after the restart is successful,
will add complexity. The best way is to create a new syscall to get this which will add complexity. The best way is to create a new syscall to get this
information during execution of transaction, which will help us get last information during execution of transaction, which will help us get last
hardfork slot without any interface changes for the instruction. hardfork slot without any interface changes for the instruction.
@ -51,10 +51,11 @@ hardfork slot without any interface changes for the instruction.
The implementation of this syscall is pretty straitforward. In solana client all The implementation of this syscall is pretty straitforward. In solana client all
the hardforks for a cluster are stored in the bank structure. The last hard fork the hardforks for a cluster are stored in the bank structure. The last hard fork
slot can be retrieved and then stored in invoke context, so that the executing slot can be retrieved and then stored in invoke context, so that the executing
dapp can access it. program can access it.
For other clients, we have to get the last hard fork slot information and make For other clients, we have to get the last hard fork slot information and make
it accessible to the runtime of the dapp. it accessible to the runtime of the program. If there is no hard fork done yet
on the cluster we consider that the first hard for is at Slot `0`.
### Overview of changes for solana client ### Overview of changes for solana client
@ -74,12 +75,12 @@ in this functions implementation.
## Impact ## Impact
Dapps will start using this new syscall to correctly address the security Programs will start using this new syscall to correctly address the security
concerns during network restart. This will increase the reliability of solana concerns during network restart. This will increase the reliability of solana
cluster as whole and make dapps more confident to handle edge cases during cluster as whole and make programs developers more confident to handle edge
such extreme events. cases during such extreme events.
As the method is syscall the dapp developers do not need to pass any new As the method is syscall the developers do not need to pass any new
accounts or sysvars to the instruction to use this feature. accounts or sysvars to the instruction to use this feature.
## Security Consideration ## Security Consideration
@ -88,6 +89,6 @@ None
## Backwards Compatibility ## Backwards Compatibility
The dapps using the new syscall could not be used on solana version which does The programs using the new syscall could not be used on solana version which
not implement this feature. Existing dapps which do not use this feature are does not implement this feature. Existing programs which do not use this feature
not impacted at all. are not impacted at all.