Lending protocol

crates/currency/Cargo.toml

@@ -19,10 +19,11 @@ pallet-transaction-payment = { git = "https://github.com/paritytech/substrate",
 
 # Parachain dependencies
 primitives = { package = "interbtc-primitives", path = "../../primitives", default-features = false }
+pallet-traits = { path = '../traits', default-features = false }
 
 # Orml dependencies
-orml-tokens = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "44fda4432b71f49ee59a650cf4775db895ab97af", default-features = false }
-orml-traits = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "44fda4432b71f49ee59a650cf4775db895ab97af", default-features = false }
+orml-tokens = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "2c48b626addafbea0227c068c9ab0fc16666b1b5", default-features = false }
+orml-traits = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "2c48b626addafbea0227c068c9ab0fc16666b1b5", default-features = false }
 
 # for other pallets wanting to mock functions
 mocktopus = {version = "0.7.0", optional = true }

crates/currency/src/lib.rs

@@ -15,11 +15,12 @@ pub mod amount;
 use codec::{EncodeLike, FullCodec};
 use frame_support::{dispatch::DispatchResult, traits::Get};
 use orml_traits::{MultiCurrency, MultiReservableCurrency};
-use primitives::TruncateFixedPointToInt;
+use pallet_traits::{LoansApi, OracleApi};
+use primitives::{CurrencyId as PrimitivesCurrencyId, TruncateFixedPointToInt};
 use scale_info::TypeInfo;
 use sp_runtime::{
     traits::{AtLeast32BitUnsigned, CheckedDiv, MaybeSerializeDeserialize},
-    FixedPointNumber, FixedPointOperand,
+    DispatchError, FixedPointNumber, FixedPointOperand,
 };
 use sp_std::{
     convert::{TryFrom, TryInto},
@@ -34,6 +35,46 @@ mod types;
 use types::*;
 pub use types::{CurrencyConversion, CurrencyId};
 
+pub struct CurrencyConvert<T, Oracle, Loans>(PhantomData<(T, Oracle, Loans)>);
+impl<T, Oracle, Loans> CurrencyConversion<Amount<T>, CurrencyId<T>> for CurrencyConvert<T, Oracle, Loans>
+where
+    T: Config,
+    Oracle: OracleApi<Amount<T>, CurrencyId<T>>,
+    Loans: LoansApi<CurrencyId<T>, T::AccountId, <T as pallet::Config>::Balance, Amount<T>>,
+{
+    fn convert(amount: &Amount<T>, to: CurrencyId<T>) -> Result<Amount<T>, DispatchError> {
+        if amount.currency().is_lend_token() && to.is_lend_token() {
+            // Example (lendDOT to lendINTR):
+            //   collateral_amount(convert(underlying_amount(lendDOT_amount), underlying_id(lendINTR)))
+            //   collateral_amount(convert(dot_amount, INTR))
+            //   collateral_amount(intr_amount)
+            let to_underlying_id = Loans::underlying_id(to)?;
+            let from_underlying_amount = Loans::recompute_underlying_amount(amount)?;
+            let to_underlying_amount = Oracle::convert(&from_underlying_amount, to_underlying_id)?;
+            Loans::recompute_collateral_amount(&to_underlying_amount)
+        } else if amount.currency().is_lend_token() {
+            // Example: LendDOT -> INTR =
+            //   convert(underlying_amount(lendDOT_amount), INTR)
+            //   convert(dot_amount, INTR)
+            Oracle::convert(&Loans::recompute_underlying_amount(amount)?, to)
+        } else if to.is_lend_token() {
+            // Example (DOT to lendINTR):
+            //   collateral_amount(convert(dot_amount, underlying_id(lendINTR)))
+            //   collateral_amount(convert(dot_amount, INTR))
+            //   collateral_amount(intr_amount)
+            let underlying_id = Loans::underlying_id(to)?;
+            // get the converted value expressed in the underlying asset
+            let underlying_amount = Oracle::convert(amount, underlying_id)?;
+            // get the equivalent lend_token amount using the internal exchange rate
+            Loans::recompute_collateral_amount(&underlying_amount)
+        } else {
+            // Example (DOT to INTR):
+            //   convert(dot_amount, INTR)
+            Oracle::convert(amount, to)
+        }
+    }
+}
+
 #[frame_support::pallet]
 pub mod pallet {
     use super::*;
@@ -42,7 +83,9 @@ pub mod pallet {
     /// ## Configuration
     /// The pallet's configuration trait.
     #[pallet::config]
-    pub trait Config: frame_system::Config + orml_tokens::Config<Balance = BalanceOf<Self>> {
+    pub trait Config:
+        frame_system::Config + orml_tokens::Config<Balance = BalanceOf<Self>, CurrencyId = PrimitivesCurrencyId>
+    {
         type UnsignedFixedPoint: FixedPointNumber<Inner = BalanceOf<Self>>
             + TruncateFixedPointToInt
             + Encode

crates/currency/src/mock.rs

@@ -93,6 +93,9 @@ impl orml_tokens::Config for Test {
     type WeightInfo = ();
     type ExistentialDeposits = ExistentialDeposits;
     type OnDust = ();
+    type OnSlash = ();
+    type OnDeposit = ();
+    type OnTransfer = ();
     type MaxLocks = MaxLocks;
     type DustRemovalWhitelist = Everything;
     type MaxReserves = ConstU32<0>; // we don't use named reserves

crates/fee/Cargo.toml

@@ -35,8 +35,8 @@ pallet-timestamp = { git = "https://github.com/paritytech/substrate", branch = "
 currency = { path = "../currency", features = ["testing-utils"] }
 
 # Orml dependencies
-orml-tokens = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "44fda4432b71f49ee59a650cf4775db895ab97af", default-features = false }
-orml-traits = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "44fda4432b71f49ee59a650cf4775db895ab97af", default-features = false }
+orml-tokens = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "2c48b626addafbea0227c068c9ab0fc16666b1b5", default-features = false }
+orml-traits = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "2c48b626addafbea0227c068c9ab0fc16666b1b5", default-features = false }
 
 # Parachain dependencies
 primitives = { package = "interbtc-primitives", path = "../../primitives"}

crates/fee/src/mock.rs

@@ -106,6 +106,9 @@ impl orml_tokens::Config for Test {
     type WeightInfo = ();
     type ExistentialDeposits = ExistentialDeposits;
     type OnDust = ();
+    type OnSlash = ();
+    type OnDeposit = ();
+    type OnTransfer = ();
     type MaxLocks = MaxLocks;
     type DustRemovalWhitelist = Everything;
     type MaxReserves = ConstU32<0>; // we don't use named reserves

crates/issue/Cargo.toml

@@ -35,8 +35,8 @@ vault-registry = { path = "../vault-registry", default-features = false }
 primitives = { package = "interbtc-primitives", path = "../../primitives", default-features = false }
 
 # Orml dependencies
-orml-tokens = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "44fda4432b71f49ee59a650cf4775db895ab97af", default-features = false, optional = true }
-orml-traits = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "44fda4432b71f49ee59a650cf4775db895ab97af", default-features = false, optional = true }
+orml-tokens = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "2c48b626addafbea0227c068c9ab0fc16666b1b5", default-features = false, optional = true }
+orml-traits = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "2c48b626addafbea0227c068c9ab0fc16666b1b5", default-features = false, optional = true }
 
 [dev-dependencies]
 mocktopus = "0.7.0"
@@ -47,8 +47,8 @@ reward = { path = "../reward" }
 staking = { path = "../staking" }
 
 # Orml dependencies
-orml-tokens = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "44fda4432b71f49ee59a650cf4775db895ab97af" }
-orml-traits = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "44fda4432b71f49ee59a650cf4775db895ab97af" }
+orml-tokens = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "2c48b626addafbea0227c068c9ab0fc16666b1b5" }
+orml-traits = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "2c48b626addafbea0227c068c9ab0fc16666b1b5" }
 
 [features]
 default = ["std"]

crates/issue/src/mock.rs

@@ -116,6 +116,9 @@ impl orml_tokens::Config for Test {
     type WeightInfo = ();
     type ExistentialDeposits = ExistentialDeposits;
     type OnDust = ();
+    type OnSlash = ();
+    type OnDeposit = ();
+    type OnTransfer = ();
     type MaxLocks = MaxLocks;
     type DustRemovalWhitelist = Everything;
     type MaxReserves = ConstU32<0>; // we don't use named reserves

crates/loans/Cargo.toml

@@ -0,0 +1,78 @@
+[package]
+authors = ["Parallel Team", "Interlay Ltd"]
+edition = "2021"
+name = "pallet-loans"
+version = "1.9.3"
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[dependencies]
+serde = { version = "1.0.136", default-features = false, features = ["derive"], optional = true }
+codec = { package = "parity-scale-codec", version = "3.1.5", default-features = false }
+scale-info = { version = "2.1.0", default-features = false, features = ["derive"] }
+num-traits = { default-features = false, version = "0.2" }
+
+# Substrate dependencies
+sp-io = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.29", default-features = false }
+sp-core = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.29", default-features = false }
+sp-std = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.29", default-features = false }
+sp-arithmetic = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.29", default-features = false }
+sp-runtime = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.29", default-features = false }
+
+frame-support = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.29", default-features = false }
+frame-system = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.29", default-features = false }
+frame-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.29", default-features = false, optional = true }
+pallet-timestamp = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.29", default-features = false }
+
+# Parachain dependencies
+currency = { path = "../currency", default-features = false }
+pallet-traits = { path = "../traits", default-features = false }
+
+primitives = { package = "interbtc-primitives", path = "../../primitives", default-features = false }
+
+# Orml dependencies
+orml-tokens = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "2c48b626addafbea0227c068c9ab0fc16666b1b5", default-features = false }
+orml-traits = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "2c48b626addafbea0227c068c9ab0fc16666b1b5", default-features = false }
+orml-oracle = { git = "https://github.com/open-web3-stack/open-runtime-module-library", rev = "2c48b626addafbea0227c068c9ab0fc16666b1b5", default-features = false }
+
+[dev-dependencies]
+mocktopus = "0.7.0"
+
+[features]
+default = ["std"]
+std = [
+  "serde/std",
+  "codec/std",
+  "scale-info/std",
+  "num-traits/std",
+
+	"sp-io/std",
+	"sp-core/std",
+	"sp-std/std",
+	"sp-arithmetic/std",
+	"sp-runtime/std",
+
+	"frame-support/std",
+	"frame-system/std",
+	"frame-benchmarking/std",
+	"pallet-timestamp/std",
+
+	"currency/std",
+  "pallet-traits/std",
+
+  "primitives/std",
+
+  "orml-traits/std",
+  "orml-oracle/std",
+  "orml-tokens/std",
+]
+runtime-benchmarks = [
+	"frame-benchmarking",
+	"frame-support/runtime-benchmarks",
+	"frame-system/runtime-benchmarks",
+]
+try-runtime = ["frame-support/try-runtime"]
+
+[lib]
+doctest = false

crates/loans/rpc/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+authors = ['Interlay Ltd']
+edition = '2021'
+name    = 'pallet-loans-rpc'
+version = '1.9.3'
+
+[dependencies]
+codec               = { package = 'parity-scale-codec', version = '3.1.5' }
+jsonrpsee           = { version = "0.15.1", features = ["server", "macros"] }
+primitives          = { package = 'parallel-primitives', path = '../../../primitives', default-features = false }
+serde               = { version = '1.0.136', features = ['derive'] }
+sp-api              = { git = 'https://github.com/paritytech/substrate.git', branch = 'polkadot-v0.9.29' }
+sp-blockchain       = { git = 'https://github.com/paritytech/substrate.git', branch = 'polkadot-v0.9.29' }
+sp-core             = { git = 'https://github.com/paritytech/substrate.git', branch = 'polkadot-v0.9.29' }
+sp-rpc              = { git = 'https://github.com/paritytech/substrate.git', branch = 'polkadot-v0.9.29', default-features = false }
+sp-runtime          = { git = 'https://github.com/paritytech/substrate.git', branch = 'polkadot-v0.9.29' }
+
+pallet-loans-rpc-runtime-api = { path = 'runtime-api', default-features = false }
+
+[lib]
+doctest = false

crates/loans/rpc/runtime-api/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+authors = ['Interlay Ltd']
+edition = '2021'
+name    = 'pallet-loans-rpc-runtime-api'
+version = '1.9.3'
+
+[dependencies]
+codec      = { package = 'parity-scale-codec', version = '3.1.5', default-features = false, features = ['derive'] }
+primitives = { package = 'parallel-primitives', path = '../../../../primitives', default-features = false }
+sp-api     = { git = 'https://github.com/paritytech/substrate.git', branch = 'polkadot-v0.9.29', default-features = false }
+sp-runtime = { git = 'https://github.com/paritytech/substrate.git', branch = 'polkadot-v0.9.29', default-features = false }
+
+[features]
+default = ['std']
+std     = ['codec/std', 'sp-api/std', 'sp-runtime/std']
+
+[lib]
+doctest = false

crates/loans/rpc/runtime-api/src/lib.rs

@@ -0,0 +1,32 @@
+// Copyright 2022 Interlay.
+// This file is part of Interlay.
+
+// Copyright 2021 Parallel Finance Developer.
+// This file is part of Parallel Finance.
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#![cfg_attr(not(feature = "std"), no_std)]
+
+use codec::Codec;
+use primitives::{CurrencyId, Liquidity, Rate, Ratio, Shortfall};
+use sp_runtime::{DispatchError, FixedU128};
+
+sp_api::decl_runtime_apis! {
+    pub trait LoansApi<AccountId, Balance> where
+        AccountId: Codec,
+        Balance: Codec {
+        fn get_account_liquidity(account: AccountId) -> Result<(Liquidity, Shortfall, Liquidity, Shortfall), DispatchError>;
+        fn get_market_status(asset_id: CurrencyId) -> Result<(Rate, Rate, Rate, Ratio, Balance, Balance, FixedU128), DispatchError>;
+        fn get_liquidation_threshold_liquidity(account: AccountId) -> Result<(Liquidity, Shortfall, Liquidity, Shortfall), DispatchError>;
+    }
+}