feat(chain-extensions): add read-only WASM queries for subnet registration, coldkey lock, and stake availability#2768
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…ation, coldkey lock, and stake availability Adds three additive chain extension functions (IDs 34-36) for ink! contracts: - get_subnet_registration_state -> SubnetRegistrationState - get_coldkey_lock -> Option<ColdkeyLock> - get_stake_availability -> StakeAvailability Includes runtime handlers, encodable types (frozen via #[freeze_struct]), ink! contract bindings, unit tests, and docs. Makes Pallet::stake_availability public so the chain extension can reuse it.
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Description
Adds three new read-only chain extension functions so ink!/WASM smart contracts can query subtensor state that was previously inaccessible from contracts:
get_subnet_registration_state(NetUid)SubnetRegistrationState { netuid, exists, registered_subnet_counter }get_coldkey_lock(AccountId, NetUid)Option<ColdkeyLock { locked_mass, conviction_bits, last_update }>get_stake_availability(AccountId, NetUid)StakeAvailability { netuid, total, locked, available }These are additive (new function IDs 34–36) and read-only — no existing chain extension function or ABI is changed, so already-deployed contracts are unaffected.
Implementation
chain-extensions/src/types.rs— newFunctionIdvariants (34–36) and SCALE-encodable result structs (SubnetRegistrationState,ColdkeyLock,StakeAvailability), each frozen with#[freeze_struct(..)].chain-extensions/src/lib.rs— dispatch handlers that decode inputs and write SCALE-encoded outputs.pallets/subtensor/src/staking/lock.rs—Pallet::stake_availabilitychanged frompub(crate)topubso the chain extension can reuse it.contract-tests/bittensor/lib.rs— ink! chain-extension bindings and contract message wrappers for the three new functions.docs/wasm-contracts.md— documents the three new functions.Type of Change
Breaking Change
None. The new functions are additive at new IDs and read-only; no existing function signature or ABI changes. (The pre-existing docs caveat about functions 16/17 argument order is unrelated and unchanged by this PR.)