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pragma solidity 0.6.12;

import {RLPReader} from "./utils/RLPReader.sol";
import {System} from "./System.sol";
import {IStateReceiver} from "./IStateReceiver.sol";

contract StateReceiver is System {
  using RLPReader for bytes;
  using RLPReader for RLPReader.RLPItem;

  uint256 public lastStateId;

  bytes32 public failedStateSyncsRoot;
  mapping(bytes32 => bool) public nullifier;

  mapping(uint256 => bytes) public failedStateSyncs;

  address public immutable rootSetter;
  uint256 public leafCount;
  uint256 public replayCount;
  uint256 public constant TREE_DEPTH = 16;

  event StateCommitted(uint256 indexed stateId, bool success);
  event StateSyncReplay(uint256 indexed stateId);

  constructor(address _rootSetter) public {
    rootSetter = _rootSetter;
  }

  function commitState(uint256 syncTime, bytes calldata recordBytes) external onlySystem returns (bool success) {
    // parse state data
    RLPReader.RLPItem[] memory dataList = recordBytes.toRlpItem().toList();
    uint256 stateId = dataList[0].toUint();
    require(lastStateId + 1 == stateId, "StateIds are not sequential");
    lastStateId++;
    address receiver = dataList[1].toAddress();
    bytes memory stateData = dataList[2].toBytes();
    // notify state receiver contract, in a non-revert manner
    if (isContract(receiver)) {
      uint256 txGas = 5000000;

      bytes memory data = abi.encodeWithSignature("onStateReceive(uint256,bytes)", stateId, stateData);
      // solium-disable-next-line security/no-inline-assembly
      assembly {
        success := call(txGas, receiver, 0, add(data, 0x20), mload(data), 0, 0)
      }
      emit StateCommitted(stateId, success);
      if (!success) failedStateSyncs[stateId] = abi.encode(receiver, stateData);
    }
  }

  function replayFailedStateSync(uint256 stateId) external {
    bytes memory stateSyncData = failedStateSyncs[stateId];
    require(stateSyncData.length != 0, "!found");
    delete failedStateSyncs[stateId];

    (address receiver, bytes memory stateData) = abi.decode(stateSyncData, (address, bytes));
    emit StateSyncReplay(stateId);
    IStateReceiver(receiver).onStateReceive(stateId, stateData); // revertable
  }

  function setRootAndLeafCount(bytes32 _root, uint256 _leafCount) external {
    require(msg.sender == rootSetter, "!rootSetter");
    failedStateSyncsRoot = _root;
    leafCount = _leafCount;
  }

  function replayHistoricFailedStateSync(
    bytes32[TREE_DEPTH] calldata proof,
    uint256 leafIndex,
    uint256 stateId,
    address receiver,
    bytes calldata data
  ) external {
    require(leafIndex < 2 ** TREE_DEPTH, "invalid leafIndex");
    require(++replayCount <= leafCount, "end");
    bytes32 root = failedStateSyncsRoot;
    require(root != bytes32(0), "!root");

    bytes32 leafHash = keccak256(abi.encode(stateId, receiver, data));
    bytes32 zeroHash = 0x28cf91ac064e179f8a42e4b7a20ba080187781da55fd4f3f18870b7a25bacb55; // keccak256(abi.encode(uint256(0), address(0), new bytes(0)));
    require(leafHash != zeroHash && !nullifier[leafHash], "used");
    nullifier[leafHash] = true;

    require(root == _getRoot(proof, leafIndex, leafHash), "!proof");

    emit StateSyncReplay(stateId);
    IStateReceiver(receiver).onStateReceive(stateId, data);
  }

  function _getRoot(bytes32[TREE_DEPTH] memory proof, uint256 index, bytes32 leafHash) private pure returns (bytes32) {
    bytes32 node = leafHash;

    for (uint256 height = 0; height < TREE_DEPTH; height++) {
      if (((index >> height) & 1) == 1) node = keccak256(abi.encodePacked(proof[height], node));
      else node = keccak256(abi.encodePacked(node, proof[height]));
    }

    return node;
  }

  // check if address is contract
  function isContract(address _addr) private view returns (bool) {
    uint32 size;
    // solium-disable-next-line security/no-inline-assembly
    assembly {
      size := extcodesize(_addr)
    }
    return (size > 0);
  }
}

pragma solidity >0.5.11;

// IStateReceiver represents interface to receive state
interface IStateReceiver {
  function onStateReceive(uint256 stateId, bytes calldata data) external;
}

pragma solidity >0.5.11;

contract System {
  address public constant SYSTEM_ADDRESS = 0xffffFFFfFFffffffffffffffFfFFFfffFFFfFFfE;

  modifier onlySystem() {
    require(msg.sender == SYSTEM_ADDRESS, "Not System Addess!");
    _;
  }
}

// SPDX-License-Identifier: Apache-2.0

/*
 * @author Hamdi Allam [email protected]
 * Please reach out with any questions or concerns
 */
pragma solidity >=0.5.10 <0.9.0;

library RLPReader {
  uint8 constant STRING_SHORT_START = 0x80;
  uint8 constant STRING_LONG_START = 0xb8;
  uint8 constant LIST_SHORT_START = 0xc0;
  uint8 constant LIST_LONG_START = 0xf8;
  uint8 constant WORD_SIZE = 32;

  struct RLPItem {
    uint256 len;
    uint256 memPtr;
  }

  struct Iterator {
    RLPItem item; // Item that's being iterated over.
    uint256 nextPtr; // Position of the next item in the list.
  }

  /*
   * @dev Returns the next element in the iteration. Reverts if it has not next element.
   * @param self The iterator.
   * @return The next element in the iteration.
   */
  function next(Iterator memory self) internal pure returns (RLPItem memory) {
    require(hasNext(self));

    uint256 ptr = self.nextPtr;
    uint256 itemLength = _itemLength(ptr);
    self.nextPtr = ptr + itemLength;

    return RLPItem(itemLength, ptr);
  }

  /*
   * @dev Returns true if the iteration has more elements.
   * @param self The iterator.
   * @return true if the iteration has more elements.
   */
  function hasNext(Iterator memory self) internal pure returns (bool) {
    RLPItem memory item = self.item;
    return self.nextPtr < item.memPtr + item.len;
  }

  /*
   * @param item RLP encoded bytes
   */
  function toRlpItem(bytes memory item) internal pure returns (RLPItem memory) {
    uint256 memPtr;
    assembly {
      memPtr := add(item, 0x20)
    }

    return RLPItem(item.length, memPtr);
  }

  /*
   * @dev Create an iterator. Reverts if item is not a list.
   * @param self The RLP item.
   * @return An 'Iterator' over the item.
   */
  function iterator(RLPItem memory self) internal pure returns (Iterator memory) {
    require(isList(self));

    uint256 ptr = self.memPtr + _payloadOffset(self.memPtr);
    return Iterator(self, ptr);
  }

  /*
   * @param the RLP item.
   */
  function rlpLen(RLPItem memory item) internal pure returns (uint256) {
    return item.len;
  }

  /*
   * @param the RLP item.
   * @return (memPtr, len) pair: location of the item's payload in memory.
   */
  function payloadLocation(RLPItem memory item) internal pure returns (uint256, uint256) {
    uint256 offset = _payloadOffset(item.memPtr);
    uint256 memPtr = item.memPtr + offset;
    uint256 len = item.len - offset; // data length
    return (memPtr, len);
  }

  /*
   * @param the RLP item.
   */
  function payloadLen(RLPItem memory item) internal pure returns (uint256) {
    (, uint256 len) = payloadLocation(item);
    return len;
  }

  /*
   * @param the RLP item containing the encoded list.
   */
  function toList(RLPItem memory item) internal pure returns (RLPItem[] memory) {
    require(isList(item));

    uint256 items = numItems(item);
    RLPItem[] memory result = new RLPItem[](items);

    uint256 memPtr = item.memPtr + _payloadOffset(item.memPtr);
    uint256 dataLen;
    for (uint256 i = 0; i < items; i++) {
      dataLen = _itemLength(memPtr);
      result[i] = RLPItem(dataLen, memPtr);
      memPtr = memPtr + dataLen;
    }
    require(memPtr - item.memPtr == item.len, "Wrong total length.");

    return result;
  }

  // @return indicator whether encoded payload is a list. negate this function call for isData.
  function isList(RLPItem memory item) internal pure returns (bool) {
    if (item.len == 0) return false;

    uint8 byte0;
    uint256 memPtr = item.memPtr;
    assembly {
      byte0 := byte(0, mload(memPtr))
    }

    if (byte0 < LIST_SHORT_START) return false;
    return true;
  }

  /*
   * @dev A cheaper version of keccak256(toRlpBytes(item)) that avoids copying memory.
   * @return keccak256 hash of RLP encoded bytes.
   */
  function rlpBytesKeccak256(RLPItem memory item) internal pure returns (bytes32) {
    uint256 ptr = item.memPtr;
    uint256 len = item.len;
    bytes32 result;
    assembly {
      result := keccak256(ptr, len)
    }
    return result;
  }

  /*
   * @dev A cheaper version of keccak256(toBytes(item)) that avoids copying memory.
   * @return keccak256 hash of the item payload.
   */
  function payloadKeccak256(RLPItem memory item) internal pure returns (bytes32) {
    (uint256 memPtr, uint256 len) = payloadLocation(item);
    bytes32 result;
    assembly {
      result := keccak256(memPtr, len)
    }
    return result;
  }

  /** RLPItem conversions into data types **/

  // @returns raw rlp encoding in bytes
  function toRlpBytes(RLPItem memory item) internal pure returns (bytes memory) {
    bytes memory result = new bytes(item.len);
    if (result.length == 0) return result;

    uint256 ptr;
    assembly {
      ptr := add(0x20, result)
    }

    copy(item.memPtr, ptr, item.len);
    return result;
  }

  // any non-zero byte except "0x80" is considered true
  function toBoolean(RLPItem memory item) internal pure returns (bool) {
    require(item.len == 1);
    uint256 result;
    uint256 memPtr = item.memPtr;
    assembly {
      result := byte(0, mload(memPtr))
    }

    // SEE Github Issue #5.
    // Summary: Most commonly used RLP libraries (i.e Geth) will encode
    // "0" as "0x80" instead of as "0". We handle this edge case explicitly
    // here.
    if (result == 0 || result == STRING_SHORT_START) {
      return false;
    } else {
      return true;
    }
  }

  function toAddress(RLPItem memory item) internal pure returns (address) {
    // 1 byte for the length prefix
    require(item.len == 21);

    return address(uint160(toUint(item)));
  }

  function toUint(RLPItem memory item) internal pure returns (uint256) {
    require(item.len > 0 && item.len <= 33);

    (uint256 memPtr, uint256 len) = payloadLocation(item);

    uint256 result;
    assembly {
      result := mload(memPtr)

      // shift to the correct location if neccesary
      if lt(len, 32) {
        result := div(result, exp(256, sub(32, len)))
      }
    }

    return result;
  }

  // enforces 32 byte length
  function toUintStrict(RLPItem memory item) internal pure returns (uint256) {
    // one byte prefix
    require(item.len == 33);

    uint256 result;
    uint256 memPtr = item.memPtr + 1;
    assembly {
      result := mload(memPtr)
    }

    return result;
  }

  function toBytes(RLPItem memory item) internal pure returns (bytes memory) {
    require(item.len > 0);

    (uint256 memPtr, uint256 len) = payloadLocation(item);
    bytes memory result = new bytes(len);

    uint256 destPtr;
    assembly {
      destPtr := add(0x20, result)
    }

    copy(memPtr, destPtr, len);
    return result;
  }

  /*
   * Private Helpers
   */

  // @return number of payload items inside an encoded list.
  function numItems(RLPItem memory item) private pure returns (uint256) {
    if (item.len == 0) return 0;

    uint256 count = 0;
    uint256 currPtr = item.memPtr + _payloadOffset(item.memPtr);
    uint256 endPtr = item.memPtr + item.len;
    while (currPtr < endPtr) {
      currPtr = currPtr + _itemLength(currPtr); // skip over an item
      count++;
    }

    return count;
  }

  // @return entire rlp item byte length
  function _itemLength(uint256 memPtr) private pure returns (uint256) {
    uint256 itemLen;
    uint256 byte0;
    assembly {
      byte0 := byte(0, mload(memPtr))
    }

    if (byte0 < STRING_SHORT_START) {
      itemLen = 1;
    } else if (byte0 < STRING_LONG_START) {
      itemLen = byte0 - STRING_SHORT_START + 1;
    } else if (byte0 < LIST_SHORT_START) {
      assembly {
        let byteLen := sub(byte0, 0xb7) // # of bytes the actual length is
        memPtr := add(memPtr, 1) // skip over the first byte

        /* 32 byte word size */
        let dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to get the len
        itemLen := add(dataLen, add(byteLen, 1))
      }
    } else if (byte0 < LIST_LONG_START) {
      itemLen = byte0 - LIST_SHORT_START + 1;
    } else {
      assembly {
        let byteLen := sub(byte0, 0xf7)
        memPtr := add(memPtr, 1)

        let dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to the correct length
        itemLen := add(dataLen, add(byteLen, 1))
      }
    }

    return itemLen;
  }

  // @return number of bytes until the data
  function _payloadOffset(uint256 memPtr) private pure returns (uint256) {
    uint256 byte0;
    assembly {
      byte0 := byte(0, mload(memPtr))
    }

    if (byte0 < STRING_SHORT_START) {
      return 0;
    } else if (byte0 < STRING_LONG_START || (byte0 >= LIST_SHORT_START && byte0 < LIST_LONG_START)) {
      return 1;
    } else if (byte0 < LIST_SHORT_START) {
      // being explicit
      return byte0 - (STRING_LONG_START - 1) + 1;
    } else {
      return byte0 - (LIST_LONG_START - 1) + 1;
    }
  }

  /*
   * @param src Pointer to source
   * @param dest Pointer to destination
   * @param len Amount of memory to copy from the source
   */
  function copy(uint256 src, uint256 dest, uint256 len) private pure {
    if (len == 0) return;

    // copy as many word sizes as possible
    for (; len >= WORD_SIZE; len -= WORD_SIZE) {
      assembly {
        mstore(dest, mload(src))
      }

      src += WORD_SIZE;
      dest += WORD_SIZE;
    }

    if (len > 0) {
      // left over bytes. Mask is used to remove unwanted bytes from the word
      uint256 mask = 256 ** (WORD_SIZE - len) - 1;
      assembly {
        let srcpart := and(mload(src), not(mask)) // zero out src
        let destpart := and(mload(dest), mask) // retrieve the bytes
        mstore(dest, or(destpart, srcpart))
      }
    }
  }
}

{
  "remappings": [
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-solidity/=node_modules/openzeppelin-solidity/",
    "solidity-rlp/=node_modules/solidity-rlp/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "": [
        "ast"
      ],
      "*": [
        "abi",
        "evm.bytecode",
        "evm.deployedBytecode",
        "evm.methodIdentifiers",
        "metadata"
      ]
    }
  }
}

[{"type":"constructor","inputs":[{"name":"_rootSetter","type":"address","internalType":"address"}],"stateMutability":"nonpayable"},{"type":"function","name":"SYSTEM_ADDRESS","inputs":[],"outputs":[{"name":"","type":"address","internalType":"address"}],"stateMutability":"view"},{"type":"function","name":"TREE_DEPTH","inputs":[],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"type":"function","name":"commitState","inputs":[{"name":"syncTime","type":"uint256","internalType":"uint256"},{"name":"recordBytes","type":"bytes","internalType":"bytes"}],"outputs":[{"name":"success","type":"bool","internalType":"bool"}],"stateMutability":"nonpayable"},{"type":"function","name":"failedStateSyncs","inputs":[{"name":"","type":"uint256","internalType":"uint256"}],"outputs":[{"name":"","type":"bytes","internalType":"bytes"}],"stateMutability":"view"},{"type":"function","name":"failedStateSyncsRoot","inputs":[],"outputs":[{"name":"","type":"bytes32","internalType":"bytes32"}],"stateMutability":"view"},{"type":"function","name":"lastStateId","inputs":[],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"type":"function","name":"leafCount","inputs":[],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"type":"function","name":"nullifier","inputs":[{"name":"","type":"bytes32","internalType":"bytes32"}],"outputs":[{"name":"","type":"bool","internalType":"bool"}],"stateMutability":"view"},{"type":"function","name":"replayCount","inputs":[],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"type":"function","name":"replayFailedStateSync","inputs":[{"name":"stateId","type":"uint256","internalType":"uint256"}],"outputs":[],"stateMutability":"nonpayable"},{"type":"function","name":"replayHistoricFailedStateSync","inputs":[{"name":"proof","type":"bytes32[16]","internalType":"bytes32[16]"},{"name":"leafIndex","type":"uint256","internalType":"uint256"},{"name":"stateId","type":"uint256","internalType":"uint256"},{"name":"receiver","type":"address","internalType":"address"},{"name":"data","type":"bytes","internalType":"bytes"}],"outputs":[],"stateMutability":"nonpayable"},{"type":"function","name":"rootSetter","inputs":[],"outputs":[{"name":"","type":"address","internalType":"address"}],"stateMutability":"view"},{"type":"function","name":"setRootAndLeafCount","inputs":[{"name":"_root","type":"bytes32","internalType":"bytes32"},{"name":"_leafCount","type":"uint256","internalType":"uint256"}],"outputs":[],"stateMutability":"nonpayable"},{"type":"event","name":"StateCommitted","inputs":[{"name":"stateId","type":"uint256","indexed":true,"internalType":"uint256"},{"name":"success","type":"bool","indexed":false,"internalType":"bool"}],"anonymous":false},{"type":"event","name":"StateSyncReplay","inputs":[{"name":"stateId","type":"uint256","indexed":true,"internalType":"uint256"}],"anonymous":false}]

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