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// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.6;

import "@yield-protocol/utils-v2/contracts/access/AccessControl.sol";
import "@yield-protocol/utils-v2/contracts/cast/CastBytes32Bytes6.sol";
import "@yield-protocol/utils-v2/contracts/math/WPow.sol";
import "@yield-protocol/vault-interfaces/IOracle.sol";

import "../../constants/Constants.sol";

/**
A collection of independent Accumulator Oracles

Each Accumulator is simple: it starts when `setSource` is called, 
and each `get` call returns perSecondRate ^ (time in seconds since oracle creation)
 */
contract AccumulatorMultiOracle is IOracle, AccessControl, Constants {
    using CastBytes32Bytes6 for bytes32;
    using WPow for uint256;

    struct Accumulator {
        /// @dev secondly rate
        uint256 perSecondRate;
        /// @dev rate accumulated so far - check `get` for details
        uint256 accumulated;
        /// @dev time when `accumulated` was last updated
        uint256 lastUpdated;
    }

    mapping(bytes6 => mapping(bytes6 => Accumulator)) public sources;

    event SourceSet(bytes6 indexed baseId, bytes6 indexed kind, uint256 startRate, uint256 perSecondRate);
    event PerSecondRateUpdated(bytes6 indexed baseId, bytes6 indexed kind, uint256 perSecondRate);

    /**
    @notice Set a source
    @param baseId: base to set the source for
    @param kindId: kind of oracle (example: chi/rate)
    @param startRate: rate the oracle starts with
    @param perSecondRate: secondly rate
     */
    function setSource(
        bytes6 baseId,
        bytes6 kindId,
        uint256 startRate,
        uint256 perSecondRate
    ) external auth {
        Accumulator memory source = sources[baseId][kindId];
        require(source.accumulated == 0, "Source is already set");

        sources[baseId][kindId] = Accumulator({
            perSecondRate: perSecondRate,
            accumulated: startRate,
            lastUpdated: block.timestamp
        });
        emit SourceSet(baseId, kindId, startRate, perSecondRate);
    }

    /**
    @notice Updates accumulation rate
    
    The accumulation rate can only be updated on an up-to-date oracle: get() was called in the
    same block. See get() for more details
     */
    function updatePerSecondRate(
        bytes6 baseId,
        bytes6 kindId,
        uint256 perSecondRate
    ) external auth {
        Accumulator memory source = sources[baseId][kindId];
        require(source.accumulated != 0, "Source not found");

        require(source.lastUpdated == block.timestamp, "stale accumulator");
        sources[baseId][kindId].perSecondRate = perSecondRate;

        emit PerSecondRateUpdated(baseId, kindId, perSecondRate);
    }

    /**
     * @notice Retrieve the latest stored accumulated rate.
     */
    function peek(
        bytes32 base,
        bytes32 kind,
        uint256
    ) external view virtual override returns (uint256 accumulated, uint256 updateTime) {
        Accumulator memory source = sources[base.b6()][kind.b6()];
        require(source.accumulated != 0, "Source not found");

        accumulated = source.accumulated;
        require(accumulated > 0, "Accumulated rate is zero");

        updateTime = block.timestamp;
    }

    /**
    @notice Retrieve the latest accumulated rate from source, updating it if necessary.

    Computes baseRate ^ (block.timestamp - creation timestamp)

    pow() is not O(1), so the naive implementation will become slower as the time passes
    To workaround that, each time get() is called, we:
        1) compute the return value
        2) store the return value in `accumulated` field, update lastUpdated timestamp

    Becase we have `accumulated`, step 1 becomes `accumulated * baseRate ^ (block.timestamp - lastUpdated)
     */
    function get(
        bytes32 base,
        bytes32 kind,
        uint256
    ) external virtual override returns (uint256 accumulated, uint256 updateTime) {
        Accumulator memory accumulator = sources[base.b6()][kind.b6()];
        require(accumulator.accumulated != 0, "Source not found");

        uint256 secondsSinceLastUpdate = (block.timestamp - accumulator.lastUpdated);
        if (secondsSinceLastUpdate > 0) {
            accumulator.accumulated *= accumulator.perSecondRate.wpow(secondsSinceLastUpdate);
            accumulator.accumulated /= 1e18;
            accumulator.lastUpdated = block.timestamp;

            sources[base.b6()][kind.b6()] = accumulator;
        }

        accumulated = accumulator.accumulated;
        require(accumulated > 0, "Accumulated rate is zero");
        updateTime = block.timestamp;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms.
 *
 * Roles are referred to by their `bytes4` identifier. These are expected to be the 
 * signatures for all the functions in the contract. Special roles should be exposed
 * in the external API and be unique:
 *
 * ```
 * bytes4 public constant ROOT = 0x00000000;
 * ```
 *
 * Roles represent restricted access to a function call. For that purpose, use {auth}:
 *
 * ```
 * function foo() public auth {
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `ROOT`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {setRoleAdmin}.
 *
 * WARNING: The `ROOT` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
contract AccessControl {
    struct RoleData {
        mapping (address => bool) members;
        bytes4 adminRole;
    }

    mapping (bytes4 => RoleData) private _roles;

    bytes4 public constant ROOT = 0x00000000;
    bytes4 public constant ROOT4146650865 = 0x00000000; // Collision protection for ROOT, test with ROOT12007226833()
    bytes4 public constant LOCK = 0xFFFFFFFF;           // Used to disable further permissioning of a function
    bytes4 public constant LOCK8605463013 = 0xFFFFFFFF; // Collision protection for LOCK, test with LOCK10462387368()

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role
     *
     * `ROOT` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes4 indexed role, bytes4 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call.
     */
    event RoleGranted(bytes4 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes4 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Give msg.sender the ROOT role and create a LOCK role with itself as the admin role and no members. 
     * Calling setRoleAdmin(msg.sig, LOCK) means no one can grant that msg.sig role anymore.
     */
    constructor () {
        _grantRole(ROOT, msg.sender);   // Grant ROOT to msg.sender
        _setRoleAdmin(LOCK, LOCK);      // Create the LOCK role by setting itself as its own admin, creating an independent role tree
    }

    /**
     * @dev Each function in the contract has its own role, identified by their msg.sig signature.
     * ROOT can give and remove access to each function, lock any further access being granted to
     * a specific action, or even create other roles to delegate admin control over a function.
     */
    modifier auth() {
        require (_hasRole(msg.sig, msg.sender), "Access denied");
        _;
    }

    /**
     * @dev Allow only if the caller has been granted the admin role of `role`.
     */
    modifier admin(bytes4 role) {
        require (_hasRole(_getRoleAdmin(role), msg.sender), "Only admin");
        _;
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes4 role, address account) external view returns (bool) {
        return _hasRole(role, account);
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes4 role) external view returns (bytes4) {
        return _getRoleAdmin(role);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.

     * If ``role``'s admin role is not `adminRole` emits a {RoleAdminChanged} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function setRoleAdmin(bytes4 role, bytes4 adminRole) external virtual admin(role) {
        _setRoleAdmin(role, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes4 role, address account) external virtual admin(role) {
        _grantRole(role, account);
    }

    
    /**
     * @dev Grants all of `role` in `roles` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - For each `role` in `roles`, the caller must have ``role``'s admin role.
     */
    function grantRoles(bytes4[] memory roles, address account) external virtual {
        for (uint256 i = 0; i < roles.length; i++) {
            require (_hasRole(_getRoleAdmin(roles[i]), msg.sender), "Only admin");
            _grantRole(roles[i], account);
        }
    }

    /**
     * @dev Sets LOCK as ``role``'s admin role. LOCK has no members, so this disables admin management of ``role``.

     * Emits a {RoleAdminChanged} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function lockRole(bytes4 role) external virtual admin(role) {
        _setRoleAdmin(role, LOCK);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes4 role, address account) external virtual admin(role) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes all of `role` in `roles` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - For each `role` in `roles`, the caller must have ``role``'s admin role.
     */
    function revokeRoles(bytes4[] memory roles, address account) external virtual {
        for (uint256 i = 0; i < roles.length; i++) {
            require (_hasRole(_getRoleAdmin(roles[i]), msg.sender), "Only admin");
            _revokeRole(roles[i], account);
        }
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes4 role, address account) external virtual {
        require(account == msg.sender, "Renounce only for self");

        _revokeRole(role, account);
    }

    function _hasRole(bytes4 role, address account) internal view returns (bool) {
        return _roles[role].members[account];
    }

    function _getRoleAdmin(bytes4 role) internal view returns (bytes4) {
        return _roles[role].adminRole;
    }

    function _setRoleAdmin(bytes4 role, bytes4 adminRole) internal virtual {
        if (_getRoleAdmin(role) != adminRole) {
            _roles[role].adminRole = adminRole;
            emit RoleAdminChanged(role, adminRole);
        }
    }

    function _grantRole(bytes4 role, address account) internal {
        if (!_hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, msg.sender);
        }
    }

    function _revokeRole(bytes4 role, address account) internal {
        if (_hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, msg.sender);
        }
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;


library CastBytes32Bytes6 {
    function b6(bytes32 x) internal pure returns (bytes6 y){
        require (bytes32(y = bytes6(x)) == x, "Cast overflow");
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

import "./WMul.sol";

library WPow {
    // Taken from https://github.com/Rari-Capital/solmate/blob/main/src/utils/FixedPointMathLib.sol
    /// @dev $x ^ $n; $x is 18-decimals fixed point number
    function wpow(uint256 x, uint256 n) internal pure returns (uint256 z) {
        uint256 baseUnit = 1e18;
        assembly {
            switch x
            case 0 {
                switch n
                case 0 {
                    z := baseUnit
                }
                default {
                    z := 0
                }
            }
            default {
                switch mod(n, 2)
                case 0 {
                    z := baseUnit
                }
                default {
                    z := x
                }
                let half := div(baseUnit, 2)
                for {
                    n := div(n, 2)
                } n {
                    n := div(n, 2)
                } {
                    let xx := mul(x, x)
                    if iszero(eq(div(xx, x), x)) {
                        revert(0, 0)
                    }
                    let xxRound := add(xx, half)
                    if lt(xxRound, xx) {
                        revert(0, 0)
                    }
                    x := div(xxRound, baseUnit)
                    if mod(n, 2) {
                        let zx := mul(z, x)
                        if and(iszero(iszero(x)), iszero(eq(div(zx, x), z))) {
                            revert(0, 0)
                        }
                        let zxRound := add(zx, half)
                        if lt(zxRound, zx) {
                            revert(0, 0)
                        }
                        z := div(zxRound, baseUnit)
                    }
                }
            }
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IOracle {
    /**
     * @notice Doesn't refresh the price, but returns the latest value available without doing any transactional operations:
     * @return value in wei
     */
    function peek(
        bytes32 base,
        bytes32 quote,
        uint256 amount
    ) external view returns (uint256 value, uint256 updateTime);

    /**
     * @notice Does whatever work or queries will yield the most up-to-date price, and returns it.
     * @return value in wei
     */
    function get(
        bytes32 base,
        bytes32 quote,
        uint256 amount
    ) external returns (uint256 value, uint256 updateTime);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.6;

contract Constants {
    bytes32 constant CHI = "CHI";
    bytes32 constant RATE = "RATE";
    bytes6 constant ETH = "00";
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;


library WMul {
    // Taken from https://github.com/usmfum/USM/blob/master/contracts/WadMath.sol
    /// @dev Multiply an amount by a fixed point factor with 18 decimals, rounds down.
    function wmul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = x * y;
        unchecked { z /= 1e18; }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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able","type":"function"},{"inputs":[{"internalType":"bytes6","name":"","type":"bytes6"},{"internalType":"bytes6","name":"","type":"bytes6"}],"name":"sources","outputs":[{"internalType":"uint256","name":"perSecondRate","type":"uint256"},{"internalType":"uint256","name":"accumulated","type":"uint256"},{"internalType":"uint256","name":"lastUpdated","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes6","name":"baseId","type":"bytes6"},{"internalType":"bytes6","name":"kindId","type":"bytes6"},{"internalType":"uint256","name":"perSecondRate","type":"uint256"}],"name":"updatePerSecondRate","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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