fix(solc): make StorageLayout json parsing lossless

ethers-solc/src/artifacts/mod.rs

@@ -1619,6 +1619,7 @@ pub struct Ewasm {
     pub wasm: String,
 }
 
+/// Represents the `storage-layout` section of the `CompilerOutput` if selected.
 #[derive(Clone, Debug, Default, Serialize, Deserialize, Eq, PartialEq)]
 pub struct StorageLayout {
     pub storage: Vec<Storage>,
@@ -1647,9 +1648,16 @@ pub struct Storage {
 #[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq)]
 pub struct StorageType {
     pub encoding: String,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub key: Option<String>,
     pub label: String,
     #[serde(rename = "numberOfBytes")]
     pub number_of_bytes: String,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub value: Option<String>,
+    /// additional fields
+    #[serde(flatten)]
+    pub other: BTreeMap<String, serde_json::Value>,
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq, Hash)]
@@ -2120,4 +2128,11 @@ mod tests {
         let value = serde_json::to_string(&c).unwrap();
         pretty_assertions::assert_eq!(s, value);
     }
+
+    #[test]
+    fn test_lossless_storage_layout() {
+        let input = include_str!("../../test-data/foundryissue2462.json");
+        let layout: StorageLayout = serde_json::from_str(input).unwrap();
+        pretty_assertions::assert_eq!(input, &serde_json::to_string_pretty(&layout).unwrap());
+    }
 }

ethers-solc/test-data/foundryissue2462.json

@@ -0,0 +1,54 @@
+{
+  "storage": [
+    {
+      "astId": 3,
+      "contract": "test-data/foundryissue2462.sol:Token",
+      "label": "x",
+      "offset": 0,
+      "slot": "0",
+      "type": "t_uint256"
+    },
+    {
+      "astId": 7,
+      "contract": "test-data/foundryissue2462.sol:Token",
+      "label": "balances",
+      "offset": 0,
+      "slot": "1",
+      "type": "t_mapping(t_address,t_uint256)"
+    },
+    {
+      "astId": 13,
+      "contract": "test-data/foundryissue2462.sol:Token",
+      "label": "allowances",
+      "offset": 0,
+      "slot": "2",
+      "type": "t_mapping(t_address,t_mapping(t_address,t_uint256))"
+    }
+  ],
+  "types": {
+    "t_address": {
+      "encoding": "inplace",
+      "label": "address",
+      "numberOfBytes": "20"
+    },
+    "t_mapping(t_address,t_mapping(t_address,t_uint256))": {
+      "encoding": "mapping",
+      "key": "t_address",
+      "label": "mapping(address => mapping(address => uint256))",
+      "numberOfBytes": "32",
+      "value": "t_mapping(t_address,t_uint256)"
+    },
+    "t_mapping(t_address,t_uint256)": {
+      "encoding": "mapping",
+      "key": "t_address",
+      "label": "mapping(address => uint256)",
+      "numberOfBytes": "32",
+      "value": "t_uint256"
+    },
+    "t_uint256": {
+      "encoding": "inplace",
+      "label": "uint256",
+      "numberOfBytes": "32"
+    }
+  }
+}