Add univ3-router solver

crates/shared/src/univ3_router_api.rs

@@ -1,3 +1,5 @@
+//! Bindings for an instance of https://github.com/cowprotocol/univ3-api .
+
 use crate::solver_utils::deserialize_prefixed_hex;
 use anyhow::{Context, Result};
 use model::u256_decimal;

crates/solver/src/settlement.rs

@@ -177,7 +177,6 @@ pub trait Interaction: std::fmt::Debug + Send + Sync {
     fn encode(&self) -> Vec<EncodedInteraction>;
 }
 
-#[cfg(test)]
 impl Interaction for EncodedInteraction {
     fn encode(&self) -> Vec<EncodedInteraction> {
         vec![self.clone()]

crates/solver/src/solver.rs

@@ -38,6 +38,7 @@ mod naive_solver;
 mod oneinch_solver;
 mod paraswap_solver;
 mod single_order_solver;
+pub mod uni_v3_router_solver;
 mod zeroex_solver;
 
 /// Interface that all solvers must implement.

crates/solver/src/solver/uni_v3_router_solver.rs

@@ -0,0 +1,151 @@
+use super::{
+    single_order_solver::{execution_respects_order, SettlementError, SingleOrderSolving},
+    Auction,
+};
+use crate::{
+    encoding::EncodedInteraction,
+    interactions::allowances::{AllowanceManager, AllowanceManaging, ApprovalRequest},
+    liquidity::LimitOrder,
+    settlement::Settlement,
+};
+use ethcontract::{Account, Bytes};
+use model::order::OrderKind;
+use primitive_types::{H160, U256};
+use shared::{addr, univ3_router_api, Web3};
+
+pub struct UniV3RouterSolver {
+    api: univ3_router_api::Api,
+    settlement_contract: H160,
+    swap_router_02: H160,
+    account: Account,
+    allowance: AllowanceManager,
+}
+
+impl UniV3RouterSolver {
+    pub fn new(
+        api: univ3_router_api::Api,
+        web3: Web3,
+        settlement_contract: H160,
+        account: Account,
+    ) -> Self {
+        Self {
+            api,
+            settlement_contract,
+            // https://docs.uniswap.org/protocol/reference/deployments
+            swap_router_02: addr!("68b3465833fb72A70ecDF485E0e4C7bD8665Fc45"),
+            account,
+            allowance: AllowanceManager::new(web3, settlement_contract),
+        }
+    }
+}
+
+#[async_trait::async_trait]
+impl SingleOrderSolving for UniV3RouterSolver {
+    async fn try_settle_order(
+        &self,
+        order: LimitOrder,
+        _: &Auction,
+    ) -> Result<Option<Settlement>, SettlementError> {
+        let request = univ3_router_api::Request {
+            type_: match order.kind {
+                OrderKind::Buy => univ3_router_api::Type::Buy,
+                OrderKind::Sell => univ3_router_api::Type::Sell,
+            },
+            token_in: order.sell_token,
+            token_out: order.buy_token,
+            amount: match order.kind {
+                OrderKind::Buy => order.buy_amount,
+                OrderKind::Sell => order.sell_amount,
+            },
+            recipient: self.settlement_contract,
+        };
+        tracing::debug!(?request);
+        let response = self.api.request(&request).await?;
+        tracing::debug!(?response);
+        let (executed_buy_amount, executed_sell_amount) = match order.kind {
+            OrderKind::Buy => (order.buy_amount, response.quote),
+            OrderKind::Sell => (response.quote, order.sell_amount),
+        };
+        if !execution_respects_order(&order, executed_sell_amount, executed_buy_amount) {
+            tracing::debug!("does not respect limit price");
+            return Ok(None);
+        }
+        let prices = [
+            (order.buy_token, executed_buy_amount),
+            (order.sell_token, executed_sell_amount),
+        ];
+        let mut settlement = Settlement::new(prices.into_iter().collect());
+        settlement.with_liquidity(&order, order.full_execution_amount())?;
+        let approval = self
+            .allowance
+            .get_approval(&ApprovalRequest {
+                token: order.sell_token,
+                spender: self.swap_router_02,
+                amount: order.sell_amount,
+            })
+            .await?;
+        settlement.encoder.append_to_execution_plan(approval);
+        let interaction: EncodedInteraction = (
+            self.swap_router_02,
+            U256::from(0u32),
+            Bytes(response.call_data),
+        );
+        settlement.encoder.append_to_execution_plan(interaction);
+        Ok(Some(settlement))
+    }
+
+    fn account(&self) -> &Account {
+        &self.account
+    }
+
+    fn name(&self) -> &'static str {
+        "UniV3Router"
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use contracts::WETH9;
+    use model::order::{Order, OrderCreation};
+
+    #[tokio::test]
+    #[ignore]
+    async fn real() {
+        shared::tracing::initialize_for_tests("solver=debug");
+        let transport = shared::transport::create_env_test_transport();
+        let web3 = Web3::new(transport);
+        let api = univ3_router_api::Api::new(
+            Default::default(),
+            "http://localhost:8080".parse().unwrap(),
+        );
+        let settlement_contract = contracts::GPv2Settlement::deployed(&web3).await.unwrap();
+        let weth = WETH9::deployed(&web3).await.unwrap();
+        let solver = UniV3RouterSolver::new(
+            api,
+            web3,
+            settlement_contract.address(),
+            crate::test::account(),
+        );
+        let settlement = solver
+            .try_settle_order(
+                Order {
+                    creation: OrderCreation {
+                        sell_token: weth.address(),
+                        buy_token: testlib::tokens::DAI,
+                        sell_amount: U256::from_f64_lossy(1e18),
+                        buy_amount: U256::from(1u32),
+                        kind: OrderKind::Sell,
+                        ..Default::default()
+                    },
+                    ..Default::default()
+                }
+                .into(),
+                &Auction::default(),
+            )
+            .await
+            .unwrap()
+            .unwrap();
+        tracing::info!("{:#?}", settlement);
+    }
+}