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get stake interface in solidity #955

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26 changes: 25 additions & 1 deletion runtime/src/precompiles/solidity/staking.abi
Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,30 @@
"stateMutability": "payable",
"type": "function"
},
{
"inputs": [
{
"internalType": "bytes32",
"name": "hotkey",
"type": "bytes32"
},
{
"internalType": "bytes32",
"name": "coldkey",
"type": "bytes32"
}
],
"name": "getStake",
"outputs": [
{
"internalType": "uint64",
"name": "",
"type": "uint64"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
Expand All @@ -40,4 +64,4 @@
"stateMutability": "payable",
"type": "function"
}
]
]
12 changes: 12 additions & 0 deletions runtime/src/precompiles/solidity/staking.sol
Original file line number Diff line number Diff line change
Expand Up @@ -42,4 +42,16 @@ interface IStaking {
* - The existing stake amount must be not lower than specified amount
*/
function removeStake(bytes32 hotkey, uint256 amount, uint16 netuid) external;

/**
* @dev Returns the stake amount associated with the specified `hotkey` and `coldkey`.
*
* This function retrieves the current stake amount linked to a specific hotkey and coldkey pair.
* It is a view function, meaning it does not modify the state of the contract and is free to call.
*
* @param hotkey The hotkey public key (32 bytes).
* @param coldkey The coldkey public key (32 bytes).
* @return The current stake amount in uint64 format.
*/
function getStake(bytes32 hotkey, bytes32 coldkey) external view returns (uint64);
}
34 changes: 34 additions & 0 deletions runtime/src/precompiles/staking.rs
Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,9 @@ impl StakingPrecompile {
id if id == get_method_id("removeStake(bytes32,uint256,uint16)") => {
Self::remove_stake(handle, &method_input)
}
id if id == get_method_id("getStake(bytes32,bytes32)") => {
Self::get_stake(&method_input)
}
_ => Err(PrecompileFailure::Error {
exit_status: ExitError::InvalidRange,
}),
Expand Down Expand Up @@ -101,6 +104,37 @@ impl StakingPrecompile {
Self::dispatch(handle, call)
}

fn get_stake(data: &[u8]) -> PrecompileResult {
let (hotkey, coldkey) = Self::parse_hotkey_coldkey(data)?;

let stake = pallet_subtensor::Pallet::<Runtime>::get_stake_for_coldkey_and_hotkey(
&hotkey.into(),
&coldkey.into(),
);

let stake_u256 = U256::from(stake);
let mut result = [0_u8; 32];
U256::to_big_endian(&stake_u256, &mut result);

Ok(PrecompileOutput {
exit_status: ExitSucceed::Returned,
output: result.into(),
})
}

fn parse_hotkey_coldkey(data: &[u8]) -> Result<([u8; 32], [u8; 32]), PrecompileFailure> {
if data.len() < 64 {
return Err(PrecompileFailure::Error {
exit_status: ExitError::InvalidRange,
});
}
let mut hotkey = [0u8; 32];
hotkey.copy_from_slice(get_slice(data, 0, 32)?);
let mut coldkey = [0u8; 32];
coldkey.copy_from_slice(get_slice(data, 32, 64)?);
Ok((hotkey, coldkey))
}

fn parse_hotkey(data: &[u8]) -> Result<[u8; 32], PrecompileFailure> {
if data.len() < 32 {
return Err(PrecompileFailure::Error {
Expand Down
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