feat: add listResourceConstraints view and fix clearConstraint

Author: MishkaRogachev

ArbGasInfo.sol

@@ -4,6 +4,8 @@
 
 pragma solidity >=0.4.21 <0.9.0;
 
+import {ArbResourceConstraintsTypes} from "./ArbResourceConstraintsTypes.sol";
+
 /// @title Provides insight into the cost of using the chain.
 /// @notice These methods have been adjusted to account for Nitro's heavy use of calldata compression.
 /// Of note to end-users, we no longer make a distinction between non-zero and zero-valued calldata bytes.
@@ -116,4 +118,11 @@ interface ArbGasInfo {
     /// @notice Returns the L1 pricing surplus as of the last update (may be negative).
     /// @notice Available in ArbOS version 20 and above
     function getLastL1PricingSurplus() external view returns (int256);
+
+    /// @notice Lists all resource constraints currently configured in ArbOS.
+    /// @notice Available on ArbOS version 50 and above
+    function listResourceConstraints()
+        external
+        view
+        returns (ArbResourceConstraintsTypes.ResourceConstraint[] memory constraints);
 }

ArbOwner.sol

@@ -4,6 +4,8 @@
 
 pragma solidity >=0.4.21 <0.9.0;
 
+import {ArbResourceConstraintsTypes} from "./ArbResourceConstraintsTypes.sol";
+
 /**
  * @title Provides owners with tools for managing the rollup.
  * @notice Calls by non-owners will always revert.
@@ -256,30 +258,22 @@ interface ArbOwner {
         bool enable
     ) external;
 
-    /// @notice A pair representing a resource kind and its weight in constraint calculations.
-    /// @param resource the resource kind (see Nitro documentation for list of resources)
-    /// @param weight the relative weight of this resource in the constraint
-    struct ResourceWeight {
-        uint8 resource;
-        uint64 weight;
-    }
-
     /// @notice Adds or updates a resource constraint
     /// @notice Available on ArbOS version 50 and above
-    /// @param resources an array of (resource, weight) pairs
+    /// @param resources an array of resource–weight pairs (see Nitro documentation for the list of resources)
     /// @param periodSecs the time window for the constraint
     /// @param targetPerSec allowed usage per second across weighted resources
     function setResourceConstraint(
-        ResourceWeight[] calldata resources,
+        ArbResourceConstraintsTypes.ResourceWeight[] calldata resources,
         uint32 periodSecs,
         uint64 targetPerSec
     ) external;
 
     /// @notice Removes a resource constraint
     /// @notice Available on ArbOS version 50 and above
-    /// @param resource the resource kind (see Nitro documentation for the list of resources)
+    /// @param resources the list of resource kinds to be removed (see Nitro documentation for the list of resources)
     /// @param periodSecs the time window for the constraint
-    function clearConstraint(uint8 resource, uint32 periodSecs) external;
+    function clearConstraint(uint8[] calldata resources, uint32 periodSecs) external;
 
     /// Emitted when a successful call is made to this precompile
     event OwnerActs(bytes4 indexed method, address indexed owner, bytes data);

ArbResourceConstraintsTypes.sol

@@ -0,0 +1,23 @@
+// Copyright 2025, Offchain Labs, Inc.
+// For license information, see https://github.com/OffchainLabs/nitro-contracts/blob/main/LICENSE
+// SPDX-License-Identifier: BUSL-1.1
+
+pragma solidity >=0.4.21 <0.9.0;
+
+/// @title ArbResourceConstraintsTypes
+/// @notice Resource constraints type definitions used by ArbOwner and ArbOwnerPublic precompiles.
+library ArbResourceConstraintsTypes {
+    /// @notice A pair representing a resource kind and its weight in constraint calculations.
+    struct ResourceWeight {
+        uint8 resource;
+        uint64 weight;
+    }
+
+    /// @notice A constraint describing limits for a set of weighted resources.
+    struct ResourceConstraint {
+        ResourceWeight[] resources;
+        uint32 periodSecs;
+        uint64 targetPerSec;
+        uint64 backlog;
+    }
+}