get alpha price in Ink

chain-extensions/Cargo.toml

@@ -34,6 +34,7 @@ pallet-subtensor-proxy.workspace = true
 pallet-drand.workspace = true
 subtensor-swap-interface.workspace = true
 num_enum.workspace = true
+substrate-fixed.workspace = true
 
 [lints]
 workspace = true
@@ -64,4 +65,5 @@ std = [
 	"pallet-drand/std",
 	"subtensor-swap-interface/std",
 	"num_enum/std",
+	"substrate-fixed/std",
 ]

chain-extensions/src/lib.rs

@@ -18,7 +18,9 @@ use pallet_subtensor_proxy as pallet_proxy;
 use pallet_subtensor_proxy::WeightInfo;
 use sp_runtime::{DispatchError, Weight, traits::StaticLookup};
 use sp_std::marker::PhantomData;
+use substrate_fixed::types::U96F32;
 use subtensor_runtime_common::{AlphaCurrency, NetUid, ProxyType, TaoCurrency};
+use subtensor_swap_interface::SwapHandler;
 
 #[derive(DebugNoBound)]
 pub struct SubtensorChainExtension<T>(PhantomData<T>);
@@ -33,7 +35,8 @@ impl<T> ChainExtension<T> for SubtensorChainExtension<T>
 where
     T: pallet_subtensor::Config
         + pallet_contracts::Config
-        + pallet_proxy::Config<ProxyType = ProxyType>,
+        + pallet_proxy::Config<ProxyType = ProxyType>
+        + pallet_subtensor_swap::Config,
     T::AccountId: Clone,
     <<T as SysConfig>::Lookup as StaticLookup>::Source: From<<T as SysConfig>::AccountId>,
 {
@@ -54,7 +57,8 @@ impl<T> SubtensorChainExtension<T>
 where
     T: pallet_subtensor::Config
         + pallet_contracts::Config
-        + pallet_proxy::Config<ProxyType = ProxyType>,
+        + pallet_proxy::Config<ProxyType = ProxyType>
+        + pallet_subtensor_swap::Config,
     T::AccountId: Clone,
 {
     fn dispatch<Env>(env: &mut Env) -> Result<RetVal, DispatchError>
@@ -506,6 +510,26 @@ where
                     }
                 }
             }
+            FunctionId::GetAlphaPriceV1 => {
+                let netuid: NetUid = env
+                    .read_as()
+                    .map_err(|_| DispatchError::Other("Failed to decode input parameters"))?;
+
+                let current_alpha_price =
+                    <pallet_subtensor_swap::Pallet<T> as SwapHandler>::current_alpha_price(
+                        netuid.into(),
+                    );
+
+                let price = current_alpha_price.saturating_mul(U96F32::from_num(1_000_000_000));
+                let price: u64 = price.saturating_to_num();
+
+                let encoded_result = price.encode();
+
+                env.write_output(&encoded_result)
+                    .map_err(|_| DispatchError::Other("Failed to write output"))?;
+
+                Ok(RetVal::Converging(Output::Success as u32))
+            }
         }
     }
 }

chain-extensions/src/tests.rs

@@ -2,14 +2,15 @@
 
 use super::{SubtensorChainExtension, SubtensorExtensionEnv, mock};
 use crate::types::{FunctionId, Output};
-use codec::Encode;
+use codec::{Decode, Encode};
 use frame_support::{assert_ok, weights::Weight};
 use frame_system::RawOrigin;
 use pallet_contracts::chain_extension::RetVal;
 use pallet_subtensor::DefaultMinStake;
 use sp_core::Get;
 use sp_core::U256;
 use sp_runtime::DispatchError;
+use substrate_fixed::types::U96F32;
 use subtensor_runtime_common::{AlphaCurrency, Currency as CurrencyTrait, NetUid, TaoCurrency};
 use subtensor_swap_interface::SwapHandler;
 
@@ -964,3 +965,41 @@ fn unstake_all_success_unstakes_balance() {
         assert!(post_balance > pre_balance);
     });
 }
+
+#[test]
+fn get_alpha_price_returns_encoded_price() {
+    mock::new_test_ext(1).execute_with(|| {
+        let owner_hotkey = U256::from(8001);
+        let owner_coldkey = U256::from(8002);
+        let caller = U256::from(8003);
+
+        let netuid = mock::add_dynamic_network(&owner_hotkey, &owner_coldkey);
+
+        // Set up reserves to establish a price
+        let tao_reserve = TaoCurrency::from(150_000_000_000u64);
+        let alpha_reserve = AlphaCurrency::from(100_000_000_000u64);
+        mock::setup_reserves(netuid, tao_reserve, alpha_reserve);
+
+        // Get expected price from swap handler
+        let expected_price =
+            <pallet_subtensor_swap::Pallet<mock::Test> as SwapHandler>::current_alpha_price(
+                netuid.into(),
+            );
+        let expected_price_scaled = expected_price.saturating_mul(U96F32::from_num(1_000_000_000));
+        let expected_price_u64: u64 = expected_price_scaled.saturating_to_num();
+
+        let mut env = MockEnv::new(FunctionId::GetAlphaPriceV1, caller, netuid.encode());
+
+        let ret = SubtensorChainExtension::<mock::Test>::dispatch(&mut env).unwrap();
+        assert_success(ret);
+        assert!(env.charged_weight().is_none());
+
+        // Decode the output
+        let output_price: u64 = Decode::decode(&mut &env.output()[..]).unwrap();
+
+        assert_eq!(
+            output_price, expected_price_u64,
+            "Price should match expected value"
+        );
+    });
+}

chain-extensions/src/types.rs

@@ -20,6 +20,7 @@ pub enum FunctionId {
     SetColdkeyAutoStakeHotkeyV1 = 12,
     AddProxyV1 = 13,
     RemoveProxyV1 = 14,
+    GetAlphaPriceV1 = 15,
 }
 
 #[derive(PartialEq, Eq, Copy, Clone, Encode, Decode, Debug)]

contract-tests/bittensor/lib.rs

@@ -22,6 +22,7 @@ pub enum FunctionId {
     SetColdkeyAutoStakeHotkeyV1 = 12,
     AddProxyV1 = 13,
     RemoveProxyV1 = 14,
+    GetAlphaPriceV1 = 15,
 }
 
 #[ink::chain_extension(extension = 0x1000)]
@@ -127,6 +128,9 @@ pub trait RuntimeReadWrite {
 
     #[ink(function = 14)]
     fn remove_proxy(delegate: <CustomEnvironment as ink::env::Environment>::AccountId);
+
+    #[ink(function = 15)]
+    fn get_alpha_price(netuid: NetUid) -> u64;
 }
 
 #[ink::scale_derive(Encode, Decode, TypeInfo)]
@@ -412,5 +416,13 @@ mod bittensor {
                 .remove_proxy(delegate.into())
                 .map_err(|_e| ReadWriteErrorCode::WriteFailed)
         }
+
+        #[ink(message)]
+        pub fn get_alpha_price(&self, netuid: u16) -> Result<u64, ReadWriteErrorCode> {
+            self.env()
+                .extension()
+                .get_alpha_price(netuid.into())
+                .map_err(|_e| ReadWriteErrorCode::ReadFailed)
+        }
     }
 }

contract-tests/run-ci.sh

@@ -2,6 +2,16 @@
 
 echo "start run-ci.sh"
 
+cd contract-tests
+
+cd bittensor
+
+rustup component add rust-src
+cargo install cargo-contract 
+cargo contract build --release 
+
+cd ../..
+
 scripts/localnet.sh &>/dev/null &
 
 i=1
@@ -15,7 +25,7 @@ while [ $i -le 2000 ]; do
 done
 
 # port not available exit with error
-if [ "$i" -eq 1000 ]; then
+if [ "$i" -eq 2000 ]; then
     exit 1
 fi
 
@@ -28,14 +38,6 @@ fi
 
 cd contract-tests
 
-cd bittensor
-
-rustup component add rust-src
-cargo install cargo-contract 
-cargo contract build --release 
-
-cd ..
-
 # required for papi in get-metadata.sh, but we cannot run yarn before papi as it adds the descriptors to the package.json which won't resolve
 npm i -g polkadot-api
 

contract-tests/test/wasm.contract.test.ts

@@ -563,4 +563,25 @@ describe("Test wasm contract", () => {
         assert.ok(proxiesAfterRemove !== undefined)
         assert.ok(proxiesAfterRemove[0].length === 0)
     })
+
+    it("Can get alpha price", async () => {
+        const message = inkClient.message("get_alpha_price")
+        const data = message.encode({
+            netuid: netuid,
+        })
+
+        const response = await api.apis.ContractsApi.call(
+            convertPublicKeyToSs58(hotkey.publicKey),
+            contractAddress,
+            BigInt(0),
+            undefined,
+            undefined,
+            Binary.fromBytes(data.asBytes()),
+        )
+
+        assert.ok(response.result.success)
+        const result = message.decode(response.result.value).value.value
+
+        assert.ok(result !== undefined)
+    })
 });

runtime/src/lib.rs

@@ -237,7 +237,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
     //   `spec_version`, and `authoring_version` are the same between Wasm and native.
     // This value is set to 100 to notify Polkadot-JS App (https://polkadot.js.org/apps) to use
     //   the compatible custom types.
-    spec_version: 362,
+    spec_version: 363,
     impl_version: 1,
     apis: RUNTIME_API_VERSIONS,
     transaction_version: 1,