Merge pull request #3 from saucepoint/swapping

swapping snippets
uniswapfoundation · Oct 18, 2023 · 7aa5a45 · 7aa5a45
2 parents 71f6bed + 2379811
commit 7aa5a45
Show file tree

Hide file tree

Showing 9 changed files with 301 additions and 7 deletions.
diff --git a/src/keywords.json b/src/keywords.json
@@ -39,6 +39,11 @@
     "test",
     "echidna"
   ],
+  "/swap": [
+    "swap",
+    "trade",
+    "swapping"
+  ],
   "/super": [
     "calling",
     "parent",

diff --git a/src/nav.ts b/src/nav.ts
@@ -32,6 +32,10 @@ export const SOL_ROUTES: Route[] = [
     path: "create-liquidity",
     title: "Create Liquidity"
   },
+  {
+    path: "swap",
+    title: "Swap"
+  },
   {
     path: "hello-world",
     title: "Hello World",

diff --git a/src/pages/swap/Swap.sol b/src/pages/swap/Swap.sol
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {IPoolManager} from "@uniswap/v4-core/contracts/interfaces/IPoolManager.sol";
+import {PoolKey} from "@uniswap/v4-core/contracts/types/PoolKey.sol";
+import {PoolSwapTest} from "@uniswap/v4-core/contracts/test/PoolSwapTest.sol";
+import {TickMath} from "@uniswap/v4-core/contracts/libraries/TickMath.sol";
+
+contract Swap {
+    // set the router address
+    PoolSwapTest swapRouter = PoolSwapTest(0x01);
+
+    // slippage tolerance to allow for unlimited price impact
+    uint160 public constant MIN_PRICE_LIMIT = TickMath.MIN_SQRT_RATIO + 1;
+    uint160 public constant MAX_PRICE_LIMIT = TickMath.MAX_SQRT_RATIO - 1;
+
+    /// @notice Swap tokens
+    /// @param key the pool where the swap is happening
+    /// @param amountSpecified the amount of tokens to swap
+    /// @param zeroForOne whether the swap is token0 -> token1 or token1 -> token0
+    /// @param hookData any data to be passed to the pool's hook
+    function swap(PoolKey memory key, int256 amountSpecified, bool zeroForOne, bytes memory hookData) internal {
+        IPoolManager.SwapParams memory params = IPoolManager.SwapParams({
+            zeroForOne: zeroForOne,
+            amountSpecified: amountSpecified,
+            sqrtPriceLimitX96: zeroForOne ? MIN_PRICE_LIMIT : MAX_PRICE_LIMIT // unlimited impact
+        });
+
+        // in v4, users have the option to receieve native ERC20s or wrapped ERC1155 tokens
+        // here, we'll take the ERC20s
+        PoolSwapTest.TestSettings memory testSettings =
+            PoolSwapTest.TestSettings({withdrawTokens: true, settleUsingTransfer: true});
+
+        swapRouter.swap(key, params, testSettings, hookData);
+    }
+}
diff --git a/src/pages/swap/SwapExampleInputs.sol b/src/pages/swap/SwapExampleInputs.sol
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {IPoolManager} from "@uniswap/v4-core/contracts/interfaces/IPoolManager.sol";
+import {PoolKey} from "@uniswap/v4-core/contracts/types/PoolKey.sol";
+import {PoolSwapTest} from "@uniswap/v4-core/contracts/test/PoolSwapTest.sol";
+import {TickMath} from "@uniswap/v4-core/contracts/libraries/TickMath.sol";
+
+contract SwapExampleInputs {
+    // set the router address
+    PoolSwapTest swapRouter = PoolSwapTest(0x01);
+
+    // slippage tolerance to allow for unlimited price impact
+    uint160 public constant MIN_PRICE_LIMIT = TickMath.MIN_SQRT_RATIO + 1;
+    uint160 public constant MAX_PRICE_LIMIT = TickMath.MAX_SQRT_RATIO - 1;
+
+    function exampleA() internal {
+        address token0 = address(0x11);
+        address token1 = address(0x22);
+
+        // Using a hookless pool
+        PoolKey memory pool = PoolKey({
+            currency0: Currency(token0),
+            currency1: Currency(token1),
+            fee: 3000,
+            tickSpacing: 60,
+            hooks: IHooks(address(0x0))
+        });
+
+        // approve tokens to the swap router
+        IERC20(token0).approve(address(swapRouter), type(uint256).max);
+        IERC20(token1).approve(address(swapRouter), type(uint256).max);
+
+        // ---------------------------- //
+        // Swap 1e18 token0 into token1
+        // ---------------------------- //
+        bool zeroForOne = true;
+        IPoolManager.SwapParams memory params = IPoolManager.SwapParams({
+            zeroForOne: zeroForOne,
+            amountSpecified: 1e18,
+            sqrtPriceLimitX96: zeroForOne ? MIN_PRICE_LIMIT : MAX_PRICE_LIMIT // unlimited impact
+        });
+
+        // in v4, users have the option to receieve native ERC20s or wrapped ERC1155 tokens
+        // here, we'll take the ERC20s
+        PoolSwapTest.TestSettings memory testSettings =
+            PoolSwapTest.TestSettings({withdrawTokens: true, settleUsingTransfer: true});
+
+        bytes memory hookData = new bytes(0); // no hook data on the hookless pool
+        swapRouter.swap(key, params, testSettings, hookData);
+    }
+}
diff --git a/src/pages/swap/index.html.ts b/src/pages/swap/index.html.ts
@@ -0,0 +1,126 @@
+// metadata
+export const version = "0.8.20"
+export const title = "Single Swap"
+export const description = "Swapping on a single pool"
+
+export const keywords = [
+    "swap",
+    "trade",
+    "swapping",
+]
+
+export const codes = [
+    {
+        fileName: "Swap.sol",
+        code: "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",
+    },
+    {
+        fileName: "SwapExampleInputs.sol",
+        code: "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",
+    },
+]
+
+const html = `<blockquote>
+<p>Expect Uniswap Labs to release an official contract around launch</p>
+</blockquote>
+<p>Using the <code>v4-core</code> provided <em>test</em> router, we can swap on a single pool. These snippets should only be used for non-production, testing purposes</p>
+<p>Swapping, in production, will typically use a periphery contract. It is <strong>not</strong> recommended to directly swap with <code>poolManager.swap</code></p>
+<p>Swapping will require 3 arguments:</p>
+<ul>
+<li>Which pool/hook to swap on</li>
+<li>The direction of the swap, token0 -&gt; token1 or token1 -&gt; token0</li>
+<li>The input token amount</li>
+</ul>
+<p>(Note: A quoter contract is unavailable at this time)</p>
+<pre><code class="language-solidity"><span class="hljs-comment">// SPDX-License-Identifier: MIT</span>
+<span class="hljs-meta"><span class="hljs-keyword">pragma</span> <span class="hljs-keyword">solidity</span> ^0.8.20;</span>
+
+<span class="hljs-keyword">import</span> {<span class="hljs-title">IPoolManager</span>} <span class="hljs-title"><span class="hljs-keyword">from</span></span> <span class="hljs-string">"@uniswap/v4-core/contracts/interfaces/IPoolManager.sol"</span>;
+<span class="hljs-keyword">import</span> {<span class="hljs-title">PoolKey</span>} <span class="hljs-title"><span class="hljs-keyword">from</span></span> <span class="hljs-string">"@uniswap/v4-core/contracts/types/PoolKey.sol"</span>;
+<span class="hljs-keyword">import</span> {<span class="hljs-title">PoolSwapTest</span>} <span class="hljs-title"><span class="hljs-keyword">from</span></span> <span class="hljs-string">"@uniswap/v4-core/contracts/test/PoolSwapTest.sol"</span>;
+<span class="hljs-keyword">import</span> {<span class="hljs-title">TickMath</span>} <span class="hljs-title"><span class="hljs-keyword">from</span></span> <span class="hljs-string">"@uniswap/v4-core/contracts/libraries/TickMath.sol"</span>;
+
+<span class="hljs-class"><span class="hljs-keyword">contract</span> <span class="hljs-title">Swap</span> </span>{
+    <span class="hljs-comment">// set the router address</span>
+    PoolSwapTest swapRouter <span class="hljs-operator">=</span> PoolSwapTest(<span class="hljs-number">0x01</span>);
+
+    <span class="hljs-comment">// slippage tolerance to allow for unlimited price impact</span>
+    <span class="hljs-keyword">uint160</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">constant</span> MIN_PRICE_LIMIT <span class="hljs-operator">=</span> TickMath.MIN_SQRT_RATIO <span class="hljs-operator">+</span> <span class="hljs-number">1</span>;
+    <span class="hljs-keyword">uint160</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">constant</span> MAX_PRICE_LIMIT <span class="hljs-operator">=</span> TickMath.MAX_SQRT_RATIO <span class="hljs-operator">-</span> <span class="hljs-number">1</span>;
+
+    <span class="hljs-comment">/// @notice Swap tokens</span>
+    <span class="hljs-comment">/// @param key the pool where the swap is happening</span>
+    <span class="hljs-comment">/// @param amountSpecified the amount of tokens to swap</span>
+    <span class="hljs-comment">/// @param zeroForOne whether the swap is token0 -&gt; token1 or token1 -&gt; token0</span>
+    <span class="hljs-comment">/// @param hookData any data to be passed to the pool&#x27;s hook</span>
+    <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">swap</span>(<span class="hljs-params">PoolKey <span class="hljs-keyword">memory</span> key, <span class="hljs-keyword">int256</span> amountSpecified, <span class="hljs-keyword">bool</span> zeroForOne, <span class="hljs-keyword">bytes</span> <span class="hljs-keyword">memory</span> hookData</span>) <span class="hljs-title"><span class="hljs-keyword">internal</span></span> </span>{
+        IPoolManager.SwapParams <span class="hljs-keyword">memory</span> params <span class="hljs-operator">=</span> IPoolManager.SwapParams({
+            zeroForOne: zeroForOne,
+            amountSpecified: amountSpecified,
+            sqrtPriceLimitX96: zeroForOne ? MIN_PRICE_LIMIT : MAX_PRICE_LIMIT <span class="hljs-comment">// unlimited impact</span>
+        });
+
+        <span class="hljs-comment">// in v4, users have the option to receieve native ERC20s or wrapped ERC1155 tokens</span>
+        <span class="hljs-comment">// here, we&#x27;ll take the ERC20s</span>
+        PoolSwapTest.TestSettings <span class="hljs-keyword">memory</span> testSettings <span class="hljs-operator">=</span>
+            PoolSwapTest.TestSettings({withdrawTokens: <span class="hljs-literal">true</span>, settleUsingTransfer: <span class="hljs-literal">true</span>});
+
+        swapRouter.swap(key, params, testSettings, hookData);
+    }
+}
+</code></pre><h3>Examples of Swapping on a V4 Pool</h3>
+<pre><code class="language-solidity"><span class="hljs-comment">// SPDX-License-Identifier: MIT</span>
+<span class="hljs-meta"><span class="hljs-keyword">pragma</span> <span class="hljs-keyword">solidity</span> ^0.8.20;</span>
+
+<span class="hljs-keyword">import</span> {<span class="hljs-title">IPoolManager</span>} <span class="hljs-title"><span class="hljs-keyword">from</span></span> <span class="hljs-string">"@uniswap/v4-core/contracts/interfaces/IPoolManager.sol"</span>;
+<span class="hljs-keyword">import</span> {<span class="hljs-title">PoolKey</span>} <span class="hljs-title"><span class="hljs-keyword">from</span></span> <span class="hljs-string">"@uniswap/v4-core/contracts/types/PoolKey.sol"</span>;
+<span class="hljs-keyword">import</span> {<span class="hljs-title">PoolSwapTest</span>} <span class="hljs-title"><span class="hljs-keyword">from</span></span> <span class="hljs-string">"@uniswap/v4-core/contracts/test/PoolSwapTest.sol"</span>;
+<span class="hljs-keyword">import</span> {<span class="hljs-title">TickMath</span>} <span class="hljs-title"><span class="hljs-keyword">from</span></span> <span class="hljs-string">"@uniswap/v4-core/contracts/libraries/TickMath.sol"</span>;
+
+<span class="hljs-class"><span class="hljs-keyword">contract</span> <span class="hljs-title">SwapExampleInputs</span> </span>{
+    <span class="hljs-comment">// set the router address</span>
+    PoolSwapTest swapRouter <span class="hljs-operator">=</span> PoolSwapTest(<span class="hljs-number">0x01</span>);
+
+    <span class="hljs-comment">// slippage tolerance to allow for unlimited price impact</span>
+    <span class="hljs-keyword">uint160</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">constant</span> MIN_PRICE_LIMIT <span class="hljs-operator">=</span> TickMath.MIN_SQRT_RATIO <span class="hljs-operator">+</span> <span class="hljs-number">1</span>;
+    <span class="hljs-keyword">uint160</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">constant</span> MAX_PRICE_LIMIT <span class="hljs-operator">=</span> TickMath.MAX_SQRT_RATIO <span class="hljs-operator">-</span> <span class="hljs-number">1</span>;
+
+    <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">exampleA</span>(<span class="hljs-params"></span>) <span class="hljs-title"><span class="hljs-keyword">internal</span></span> </span>{
+        <span class="hljs-keyword">address</span> token0 <span class="hljs-operator">=</span> <span class="hljs-keyword">address</span>(<span class="hljs-number">0x11</span>);
+        <span class="hljs-keyword">address</span> token1 <span class="hljs-operator">=</span> <span class="hljs-keyword">address</span>(<span class="hljs-number">0x22</span>);
+
+        <span class="hljs-comment">// Using a hookless pool</span>
+        PoolKey <span class="hljs-keyword">memory</span> pool <span class="hljs-operator">=</span> PoolKey({
+            currency0: Currency(token0),
+            currency1: Currency(token1),
+            fee: <span class="hljs-number">3000</span>,
+            tickSpacing: <span class="hljs-number">60</span>,
+            hooks: IHooks(<span class="hljs-keyword">address</span>(<span class="hljs-number">0x0</span>))
+        });
+
+        <span class="hljs-comment">// approve tokens to the swap router</span>
+        IERC20(token0).approve(<span class="hljs-keyword">address</span>(swapRouter), <span class="hljs-keyword">type</span>(<span class="hljs-keyword">uint256</span>).<span class="hljs-built_in">max</span>);
+        IERC20(token1).approve(<span class="hljs-keyword">address</span>(swapRouter), <span class="hljs-keyword">type</span>(<span class="hljs-keyword">uint256</span>).<span class="hljs-built_in">max</span>);
+
+        <span class="hljs-comment">// ---------------------------- //</span>
+        <span class="hljs-comment">// Swap 1e18 token0 into token1</span>
+        <span class="hljs-comment">// ---------------------------- //</span>
+        <span class="hljs-keyword">bool</span> zeroForOne <span class="hljs-operator">=</span> <span class="hljs-literal">true</span>;
+        IPoolManager.SwapParams <span class="hljs-keyword">memory</span> params <span class="hljs-operator">=</span> IPoolManager.SwapParams({
+            zeroForOne: zeroForOne,
+            amountSpecified: <span class="hljs-number">1e18</span>,
+            sqrtPriceLimitX96: zeroForOne ? MIN_PRICE_LIMIT : MAX_PRICE_LIMIT <span class="hljs-comment">// unlimited impact</span>
+        });
+
+        <span class="hljs-comment">// in v4, users have the option to receieve native ERC20s or wrapped ERC1155 tokens</span>
+        <span class="hljs-comment">// here, we&#x27;ll take the ERC20s</span>
+        PoolSwapTest.TestSettings <span class="hljs-keyword">memory</span> testSettings <span class="hljs-operator">=</span>
+            PoolSwapTest.TestSettings({withdrawTokens: <span class="hljs-literal">true</span>, settleUsingTransfer: <span class="hljs-literal">true</span>});
+
+        <span class="hljs-keyword">bytes</span> <span class="hljs-keyword">memory</span> hookData <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-keyword">bytes</span>(<span class="hljs-number">0</span>); <span class="hljs-comment">// no hook data on the hookless pool</span>
+        swapRouter.swap(key, params, testSettings, hookData);
+    }
+}
+</code></pre>`
+
+export default html