Support for Chainlink Automation and preparing for v0.2.3-beta release

package.json

@@ -2,7 +2,7 @@
   "name": "@chainlink/local",
   "description": "Chainlink Local Simulator",
   "license": "MIT",
-  "version": "0.2.2-beta",
+  "version": "0.2.3-beta",
   "files": [
     "src/**/*.sol",
     "!src/test/**/*",
@@ -42,7 +42,7 @@
     "solidity-docgen": "^0.6.0-beta.36"
   },
   "dependencies": {
-    "@chainlink/contracts": "^1.1.1",
+    "@chainlink/contracts": "^1.2.0",
     "@chainlink/contracts-ccip": "^1.5.0-beta.0"
   }
 }

src/automation/MockAutomationForwarder.sol

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity ^0.8.0;
+
+uint256 constant PERFORM_GAS_CUSHION = 5_000;
+
+/**
+ * @title MockAutomationForwarder is a relayer that sits between the simulator and the customer's target contract
+ * @dev The purpose of the forwarder is to give customers a consistent address to authorize against,
+ * which stays consistent between migrations.
+ */
+contract MockAutomationForwarder {
+    /**
+     * @notice forward is called by the registry and forwards the call to the target
+     * @param gasAmount is the amount of gas to use in the call
+     * @param data is the 4 bytes function selector + arbitrary function data
+     * @return success indicating whether the target call succeeded or failed
+     */
+    function forward(address target, uint256 gasAmount, bytes memory data)
+        external
+        returns (bool success, uint256 gasUsed)
+    {
+        gasUsed = gasleft();
+        assembly {
+            let g := gas()
+            // Compute g -= PERFORM_GAS_CUSHION and check for underflow
+            if lt(g, PERFORM_GAS_CUSHION) { revert(0, 0) }
+            g := sub(g, PERFORM_GAS_CUSHION)
+            // if g - g//64 <= gasAmount, revert
+            // (we subtract g//64 because of EIP-150)
+            if iszero(gt(sub(g, div(g, 64)), gasAmount)) { revert(0, 0) }
+            // solidity calls check that a contract actually exists at the destination, so we do the same
+            if iszero(extcodesize(target)) { revert(0, 0) }
+            // call with exact gas
+            success := call(gasAmount, target, 0, add(data, 0x20), mload(data), 0, 0)
+        }
+        gasUsed = gasUsed - gasleft();
+        return (success, gasUsed);
+    }
+}