make metadata historically dependant

Signed-off-by: Uncle Fatso <uncle.fatso@ghostchain.io>

.env.template

@@ -104,18 +104,12 @@ GOVERNOR_VOTING_PERIOD=
 GOVERNOR_PROPOSAL_THRESHOLD=
 GOVERNOR_QUORUM_FRACTION=
 
-###################### Initial ghosted supply on gatekeeper ##########################
-## ghostedSupply - supply that is currently locked inside the gatekeeper            ##
+###################### Initial ghosted supply on gatekeeper ###########################
 ## existential    - minimum amount that could be reflected inside other chain        ##
-## ghostedIn     - historical supply that was bridged in (max value is 2^104)       ##
-## ghostedOut    - historical supply that was bridged out (max value is 2^104)      ##
-## deployedAt    - time when gatekeepers was deployed, could be inherited if needed ##
-######################################################################################
-INITIAL_GHOSTED_SUPPLY=
+## previousWeaver - previous weaver address if any to make linked list of weavers    ##
+#######################################################################################
 INITIAL_EXISTENTIAL_DEPOSIT=
-INITIAL_GHOSTED_IN=
-INITIAL_GHOSTED_OUT=
-GATEKEEPER_DEPLOYED_AT=
+PREVIOUS_WEAVER_ADDRESS=
 
 SEPOLIA_TEST_RPC_URL=
 SEPOLIA_TEST_API_KEY=

src/Gatekeeper.sol

@@ -10,23 +10,25 @@ contract Gatekeeper is IGatekeeper, Metadata, Weaver {
 
     uint256 public override existentialDeposit;
     uint256 public override ghostedSupply;
-    address public immutable staking; // forge-lint: disable-line(screaming-snake-case-immutable)
+    address public override staking;
 
     uint256 private _aggregatedPublicKey;
     mapping(uint256 => mapping(uint256 => bool)) private _executedTransaction;
 
     constructor(
         address _staking,
-        uint256 _ghostedSupply,
-        uint256 _existential,
-        uint48 _deployedAt,
-        uint104 _amountIn,
-        uint104 _amountOut
-    ) Metadata(_deployedAt, _amountIn, _amountOut) Weaver() {
-        existentialDeposit = _existential;
-        ghostedSupply = _ghostedSupply;
+        uint256 _existentialDeposit,
+        address _previousGatekeeper
+    ) Metadata(_previousGatekeeper) Weaver(_previousGatekeeper) {
+        existentialDeposit = _existentialDeposit;
+        if (_previousGatekeeper != address(0)) {
+            IGatekeeper previousGatekeeper = IGatekeeper(_previousGatekeeper);
+            ghostedSupply = previousGatekeeper.ghostedSupply();
+            staking = previousGatekeeper.staking();
+        } else {
             staking = _staking;
         }
+    }
 
     function ghost(bytes32 receiver, uint256 amount) external override returns (uint256) {
         if (msg.sender != staking) revert NotStaking();

src/interfaces/IGatekeeper.sol

@@ -13,6 +13,7 @@ interface IGatekeeper {
 
     function ghostedSupply() external view returns (uint256);
     function existentialDeposit() external view returns (uint256);
+    function staking() external view returns (address);
     function ghost(bytes32 receiver, uint256 amount) external returns (uint256);
     function materialize(address receiver, uint256 amount, uint256 rx, uint256 s) external;
     function rotate(uint256 aggregatedPublicKey, uint256 rx, uint256 s) external;

src/interfaces/IWeaver.sol

@@ -2,7 +2,9 @@
 pragma solidity ^0.8.20;
 
 interface IWeaver {
-    function getSlotValues(uint256 globalIndex, uint256 session, uint256 atBlock) external returns (bytes32[] memory);
-    function getProof(uint256 globalIndex, uint256 session, uint256 atBlock) external returns (bytes32[] memory);
-    function getRoot(uint256 session, uint256 atBlock) external returns (bytes32, uint256);
+    function currentSession() external view returns (uint256);
+    function startSession() external view returns (uint256);
+    function getSlotValues(uint256 globalIndex, uint256 session, uint256 atBlock) external view returns (bytes32[] memory);
+    function getProof(uint256 globalIndex, uint256 session, uint256 atBlock) external view returns (bytes32[] memory);
+    function getRoot(uint256 session, uint256 atBlock) external view returns (bytes32, uint256);
 }

src/mocks/WeaverMock.sol

@@ -4,7 +4,7 @@ pragma solidity ^0.8.20;
 import {Weaver} from "../types/Weaver.sol";
 
 contract WeaverMock is Weaver {
-    constructor() Weaver() {}
+    constructor(address previousWeaver) Weaver(previousWeaver) {}
 
     function insertTreeNode(bytes32 receiver, uint256 amount) external returns (uint256) {
         return _insertTreeNode(receiver, amount);

src/types/Metadata.sol

@@ -6,16 +6,21 @@ import {IMetadata} from "../interfaces/IMetadata.sol";
 abstract contract Metadata is IMetadata {
     GatekeeperMetadata internal _metadata;
 
-    constructor(
-        uint48 _deployedAt,
-        uint104 _amountIn,
-        uint104 _amountOut
-    ) {
+    constructor(address previosMetadata) {
+        if (previosMetadata == address(0)) {
             _metadata = GatekeeperMetadata({
-            deployedAt: _deployedAt,
-            amountIn: _amountIn,
-            amountOut: _amountOut
+                deployedAt: uint48(block.number),
+                amountIn: 0,
+                amountOut: 0
             });
+        } else {
+            IMetadata.GatekeeperMetadata memory previousMetadata = IMetadata(previosMetadata).metadata();
+            _metadata = GatekeeperMetadata({
+                deployedAt: previousMetadata.deployedAt,
+                amountIn: previousMetadata.amountIn,
+                amountOut: previousMetadata.amountOut
+            });
+        }
     }
 
     function metadata() external view returns (GatekeeperMetadata memory) {

src/types/Weaver.sol

@@ -14,20 +14,33 @@ abstract contract Weaver is IWeaver {
     uint256 public constant SLOTS = 2 ** DEPTH;
     uint256 public constant ENTRIES = DEPTH * SLOTS;
 
-    uint256 public currentSession;
+    uint256 public override currentSession;
+    uint256 public override startSession;
+    address public previousWeaver;
 
     mapping(uint256 => mapping(uint256 => Checkpoints.Trace256)) internal _treeNodes;
     mapping(uint256 => mapping(uint256 => Checkpoints.Trace160)) internal _slotLenghts;
     mapping(uint256 => mapping(uint256 => bytes32[])) internal _slotValues;
     mapping(uint256 => uint256) internal _filledEntries;
 
-    constructor() {}
+    constructor(address _previousWeaver) {
+        previousWeaver = _previousWeaver;
+        if (_previousWeaver != address(0)) {
+            uint256 newSession = IWeaver(_previousWeaver).currentSession() + 1;
+            currentSession = newSession;
+            startSession = newSession;
+        }
+    }
 
     function getSlotValues(
         uint256 globalIndex,
         uint256 session,
         uint256 atBlock
-    ) external view returns (bytes32[] memory) {
+    ) external override view returns (bytes32[] memory) {
+        if (session < startSession) {
+            return IWeaver(previousWeaver).getSlotValues(globalIndex, session, atBlock);
+        }
+
         uint256 slotIndex = globalIndex % SLOTS;
         // forge-lint: disable-next-line(unsafe-typecast)
         uint256 length = _slotLenghts[session][slotIndex].upperLookupRecent(uint96(atBlock));
@@ -42,7 +55,11 @@ abstract contract Weaver is IWeaver {
         return values;
     }
 
-    function getRoot(uint256 session, uint256 atBlock) public view returns (bytes32, uint256) {
+    function getRoot(uint256 session, uint256 atBlock) public override view returns (bytes32, uint256) {
+        if (session < startSession) {
+            return IWeaver(previousWeaver).getRoot(session, atBlock);
+        }
+
         uint256 currentLevelCount = SLOTS >> 1;
         bytes32[] memory currentLevel = new bytes32[](currentLevelCount);
 
@@ -83,7 +100,11 @@ abstract contract Weaver is IWeaver {
         uint256 globalIndex,
         uint256 session,
         uint256 atBlock
-    ) external view returns (bytes32[] memory) {
+    ) external override view returns (bytes32[] memory) {
+        if (session < startSession) {
+            return IWeaver(previousWeaver).getProof(globalIndex, session, atBlock);
+        }
+
         uint256 currentLevelCount = SLOTS;
         uint256 currentIndex = globalIndex % SLOTS;
 

test/bonding/BondDepositorty.t.sol

@@ -324,7 +324,7 @@ contract GhostBondDepositoryTest is Test {
         uint256 amount = 10_000 * 1e18; // 10,000
 
         vm.startPrank(GOVERNOR);
-        Gatekeeper gatekeeper = new Gatekeeper(address(staking), 0, 0, 0, 0, 0);
+        Gatekeeper gatekeeper = new Gatekeeper(address(staking), 0, address(0));
         staking.setGatekeeperAddress(address(gatekeeper));
         staking.setWarmupPeriod(1);
         vm.stopPrank();
@@ -509,7 +509,7 @@ contract GhostBondDepositoryTest is Test {
         }
 
         vm.startPrank(GOVERNOR);
-        Gatekeeper gatekeeper = new Gatekeeper(address(staking), 0, 0, 0, 0, 0);
+        Gatekeeper gatekeeper = new Gatekeeper(address(staking), 0, address(0));
         staking.setGatekeeperAddress(address(gatekeeper));
         staking.setWarmupPeriod(10);
         vm.stopPrank();

test/gatekeeper/Gatekeeper.t.sol

@@ -14,18 +14,21 @@ contract GatekeeperTest is Test {
     event Ghosted(bytes32 indexed receiver, uint256 indexed amount);
 
     function setUp() public {
-        gatekeeper = new Gatekeeper(ALICE, 0, EXISTENTIAL, 0, 0, 0);
+        gatekeeper = new Gatekeeper(ALICE, EXISTENTIAL, address(0));
     }
 
     function test_correctInitialization() public {
         assertEq(gatekeeper.staking(), ALICE);
         assertEq(gatekeeper.ghostedSupply(), 0);
 
-        Gatekeeper anotherGatekeeper = new Gatekeeper(BOB, INIT_AMOUNT, EXISTENTIAL, 0, 0, 0);
-        assertEq(anotherGatekeeper.staking(), BOB);
+        bytes32 receiver = bytes32(abi.encodePacked(ALICE));
+        vm.prank(ALICE);
+        gatekeeper.ghost(receiver, INIT_AMOUNT);
+
+        Gatekeeper anotherGatekeeper = new Gatekeeper(BOB, EXISTENTIAL, address(gatekeeper));
+        assertEq(anotherGatekeeper.staking(), ALICE);
         assertEq(anotherGatekeeper.ghostedSupply(), INIT_AMOUNT);
         assertEq(anotherGatekeeper.existentialDeposit(), EXISTENTIAL);
-        assertEq(anotherGatekeeper.ghostedSupply(), INIT_AMOUNT);
     }
 
     function test_ghostTokensWork(uint256 ghostAmount) public {

test/gatekeeper/GatekeeperMetadata.t.sol

@@ -9,22 +9,19 @@ contract GatekeeperMetadataTest is Test {
     uint256 constant INIT_AMOUNT  = 69 * 1e18;
     uint256 constant INIT_GHOSTED = type(uint104).max / 2;
     uint256 constant EXISTENTIAL  = 0;
-    uint48  constant DEPLOYED_AT  = 1337;
-    uint104 constant AMOUNT_IN    = 69;
-    uint104 constant AMOUNT_OUT   = 420;
 
     Gatekeeper gatekeeper;
 
     function setUp() public {
-        gatekeeper = new Gatekeeper(ALICE, INIT_GHOSTED, EXISTENTIAL, DEPLOYED_AT, AMOUNT_IN, AMOUNT_OUT);
+        gatekeeper = new Gatekeeper(ALICE, EXISTENTIAL, address(0));
     }
 
     function test_correctMetadataInitialization() public view {
         Gatekeeper.GatekeeperMetadata memory metadata = gatekeeper.metadata();
-        assertEq(metadata.deployedAt, DEPLOYED_AT);
-        assertEq(metadata.amountIn, AMOUNT_IN);
-        assertEq(metadata.amountOut, AMOUNT_OUT);
-        assertEq(gatekeeper.ghostedSupply(), INIT_GHOSTED);
+        assertEq(metadata.deployedAt, block.number);
+        assertEq(metadata.amountIn, 0);
+        assertEq(metadata.amountOut, 0);
+        assertEq(gatekeeper.ghostedSupply(), 0);
     }
 
     function test_historicalAmountsOnlyIncrease(uint256 ghostAmount) public {

test/gatekeeper/GatekeeperWeaver.t.sol

@@ -12,18 +12,12 @@ contract GatekeeperVerification is Gatekeeper {
 
     constructor(
         address staking,
-        uint256 ghostedSupply,
         uint256 existential,
-        uint48 deployedAt,
-        uint104 amountIn,
-        uint104 amountOut
+        address previousWeaver
     ) Gatekeeper(
         staking,
-        ghostedSupply,
         existential,
-        deployedAt,
-        amountIn,
-        amountOut
+        previousWeaver
     ) {}
 
     function filledEntries(uint256 session) public view returns (uint256) {
@@ -102,7 +96,7 @@ contract GatekeeperWeaverTest is Test {
     GatekeeperVerification gatekeeper;
 
     function setUp() public {
-        gatekeeper = new GatekeeperVerification(ALICE, 0, EXISTENTIAL, 0, 0, 0);
+        gatekeeper = new GatekeeperVerification(ALICE, EXISTENTIAL, address(0));
     }
 
     function test_insertationWorksAsExpected() public {
@@ -138,6 +132,35 @@ contract GatekeeperWeaverTest is Test {
         assertFalse(_verifyProof(globalIndex, newSession, 100, amounts[69], whos[69]));
         assertFalse(_verifyProof(1337, currentSession, 100, amounts[1337], whos[1337]));
         assertFalse(_verifyProof(2047, currentSession, 100, amounts[2047], whos[2047]));
+
+        vm.roll(block.number + 420);
+        gatekeeper = new GatekeeperVerification(ALICE, EXISTENTIAL, address(gatekeeper));
+        uint256 finalSession = gatekeeper.currentSession();
+
+        for (uint256 i = 0; i < 69; i++) {
+            if (i % 2 == 0) { vm.roll(block.number + 1); }
+            vm.prank(ALICE);
+            gatekeeper.ghost(whos[i], amounts[i]);
+        }
+
+        assertTrue(_verifyProof(globalIndex, newSession, block.number, amounts[69], whos[69]));
+        assertTrue(_verifyProof(0, currentSession, block.number, amounts[0], whos[0]));
+        assertTrue(_verifyProof(69, currentSession, block.number, amounts[69], whos[69]));
+        assertTrue(_verifyProof(420, currentSession, block.number, amounts[420], whos[420]));
+        assertTrue(_verifyProof(1337, currentSession, block.number, amounts[1337], whos[1337]));
+        assertTrue(_verifyProof(2047, currentSession, block.number, amounts[2047], whos[2047]));
+
+        assertTrue(_verifyProof(0, currentSession, 100, amounts[0], whos[0]));
+        assertTrue(_verifyProof(69, currentSession, 100, amounts[69], whos[69]));
+        assertTrue(_verifyProof(420, currentSession, 100, amounts[420], whos[420]));
+
+        assertFalse(_verifyProof(globalIndex, newSession, 100, amounts[69], whos[69]));
+        assertFalse(_verifyProof(1337, currentSession, 100, amounts[1337], whos[1337]));
+        assertFalse(_verifyProof(2047, currentSession, 100, amounts[2047], whos[2047]));
+
+        assertTrue(_verifyProof(0, finalSession, block.number, amounts[0], whos[0]));
+        assertTrue(_verifyProof(34, finalSession, block.number, amounts[34], whos[34]));
+        assertTrue(_verifyProof(35, finalSession, block.number, amounts[35], whos[35]));
     }
 
     function _verifyProof(

test/staking/Staking.t.sol

@@ -110,7 +110,7 @@ contract StakingTest is Test {
         treasury = new GhostTreasury(address(ftso), 69, address(authority));
         stnk.initialize(address(staking), address(treasury), address(ghst));
         ghst.initialize(address(staking));
-        gatekeeper = new Gatekeeper(address(staking), 0, 0, 0, 0, 0);
+        gatekeeper = new Gatekeeper(address(staking), 0, address(0));
         calculator = new GhostBondingCalculator(address(ftso), 1, 1);
         vm.stopPrank();
         vm.roll(block.number + 1);