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pallet-contracts: Rent projection RPC #4754
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NikVolf
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Merge it with subsistence_treshold.
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This change adds a new RPC endpoint which allows a user to query the current state of a given contract.
State rent is enacted lazy. That is, if a contract runs out of funds it becomes inaccessible, but it is not removed from the chain storage right away. Instead, it will be removed on the first access: a call or e.g. or poking with
claim_surcharge.This however poses a problem from an external users of the chain. If an external user wants to know if a given contract is usable or not, the user will have to do the calculations by themselves.
While it might be possible to work around this issue by piggybacking on some other call, we introduce a new RPC call here:
contracts_rentProjection. This call doesn't can tell the status of the given contract, it will also return the projected block number of eviction. Such functionality might be useful in creation of crawlers that would callclaim_surchargefor the nearly expiring contracts.