Contract 0xC93c8CDE0eDf4963ea1eea156099B285A945210a

Contract Overview

Balance:
0 Ether
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0x06304085823c58ccf9f4a7642c76aec4780baa939932e0b2507429ad26d1eed8Trade247137482021-05-07 14:19:2811 days 5 hrs ago0xf4e2bc18464670a684bb8ce2f5663c543db402c3 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0001838793
0x4f631e67924d9ac780c728f44428a1b5faa9f60abeecad1a3adf00b64b3cf1bbTrade247136142021-05-07 14:10:3211 days 5 hrs ago0xf4e2bc18464670a684bb8ce2f5663c543db402c3 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0001835553
0x944c5d76cbc126748849a33b5586dfed2f9f287c6305b0b00446671c5a399f6cTrade247135862021-05-07 14:08:3211 days 5 hrs ago0xf4e2bc18464670a684bb8ce2f5663c543db402c3 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0001835553
0x29006bedc04358f2b5ce8242ac02a8b7e9d2bd617e2a8473da3a0fdabd2e7259Trade247135462021-05-07 14:05:5211 days 5 hrs ago0xf4e2bc18464670a684bb8ce2f5663c543db402c3 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0001835553
0x0072e4da0d4e0b538ebc4794536b808844e6ef5f4d0a6e5dfde7282a2e826977Initialize247131462021-05-07 13:38:4811 days 6 hrs ago0xf4e2bc18464670a684bb8ce2f5663c543db402c3 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0002073123
0x70b772dae74b21bbd8b24f0618a806435bd02866d42c5a9724f7f3ec8751194dInitialize247121442021-05-07 12:30:2011 days 7 hrs ago0xf4e2bc18464670a684bb8ce2f5663c543db402c3 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0002072763
0xd6272008da79e5de758db3c64c96dc0d1f38811b09117aee810eaad2c05da577Initialize247022432021-05-07 0:58:1611 days 19 hrs ago0xf279826c6e41ed1a432da7d09ec4561abbb7635b IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0005398757.8125
0x7f71929a3ff46e26082a3b7ff090a79b365e0e820292a4cb661a193978c97c2bTrade247006342021-05-06 23:06:5211 days 20 hrs ago0xf4e2bc18464670a684bb8ce2f5663c543db402c3 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0003186256.25
0xe6b743666c59947224a09246c48832cd2ce76e11e7320c6040c6e975ccdef852Initialize247002822021-05-06 22:42:5211 days 21 hrs ago0xf4e2bc18464670a684bb8ce2f5663c543db402c3 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.000420525
0x1b19c83969405bb0e4b26302636afcbd467e3e8f1d04735b297597b8b93e3024Initialize246979772021-05-06 20:05:3611 days 23 hrs ago0xf4e2bc18464670a684bb8ce2f5663c543db402c3 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0002523123
0x6cc46e230a18422b2d9f52e19f2cb023bc5de6fc36f15152e51901582a930a65Trade241870322021-04-07 17:37:3241 days 2 hrs ago0x66c638677287d761e77deaec3ad7902c60d08eb7 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0037092615
0xd49915ec71a4b9add8098ed738d39849272703e9a2c02726c2af787806bbab1fTrade241869432021-04-07 17:24:2841 days 2 hrs ago0x66c638677287d761e77deaec3ad7902c60d08eb7 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0021310515
0x099890dd571803b9444b2caca2e7494e7d7b29e7c0ca16a7c89c640c24bd751cTrade241869152021-04-07 17:20:1241 days 2 hrs ago0x66c638677287d761e77deaec3ad7902c60d08eb7 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0016615515
0x26c12e3ebae3c37da1dbf5ab8d0ba238e8cee2cef49b63c2b4659f4ac9fa6559Trade241868562021-04-07 17:11:0841 days 2 hrs ago0x66c638677287d761e77deaec3ad7902c60d08eb7 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0016619115
0xdd481622f4cb4be99870241d17adaf1bb7ae9218c5065a941c8a92a4e41cb5a8Trade241867952021-04-07 17:03:0041 days 2 hrs ago0x66c638677287d761e77deaec3ad7902c60d08eb7 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.00097546515
0x377284a234b9a4f488172aec132f5f4f09a51d085f0027bbeddf45fc78e1b7c5Trade241864582021-04-07 16:15:2441 days 3 hrs ago0x66c638677287d761e77deaec3ad7902c60d08eb7 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0009911415
0x5ce0530165f6a528a8d642e075da3fe29835a6685e86f7e8eed0bd96ab718559Trade241862122021-04-07 15:40:4441 days 4 hrs ago0x66c638677287d761e77deaec3ad7902c60d08eb7 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0009925815
0x2fdcb4117132514463217a6bd1dc7ffad963cf41b21d7bf70614e2cf214621ceTrade241593742021-04-05 0:33:0043 days 19 hrs ago0x66c638677287d761e77deaec3ad7902c60d08eb7 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0019822830
0x7638ad01891666727b71b000ba4141a6b2cfa519344acd555e645a74f5f2ac1aInitialize241560402021-04-04 17:01:5644 days 2 hrs ago0x66c638677287d761e77deaec3ad7902c60d08eb7 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0020731230
0xdb45e54d3b6f53b90a9d72b2886a5af30f59d5c532ab372077acb057832c3a93Initialize239858762021-03-19 13:14:5260 days 6 hrs ago0x3b2092aff584dc86e1427acdfe4bce2b75b39d1b IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0016820820
0x7d2eda8fbc79a042ecb94437fa036398042314d2c6d9c5c5b8ae60b312e4f67fInitialize239717612021-03-18 5:44:4461 days 14 hrs ago0x78d32460d0a53ac2678e869eb6b4f6ba9d2ef360 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0002523123
0xafb7faf860e37a95fe810ee44d7f2a263a104c52dfa5753fb1284cdfdb05dc69Initialize239539382021-03-17 1:01:4862 days 18 hrs ago0x27aa74f5dbfce2be9ad564acd552b0d8d480a9f2 IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0001682082
0x7bec09ffdd9fe490b11a07c24def95c21eaeeff3b67fd0c616caad940f9b7abfTrade239397522021-03-16 3:51:1263 days 16 hrs ago0x25cb39a8b252b0a4b47768b57e452d714efe448a IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0004973810
0xf1d940f9ae1b5d8baf5cacfd87c6410548e19458bd25dc3f730f45cc2b725bf8Trade239397322021-03-16 3:49:2463 days 16 hrs ago0x25cb39a8b252b0a4b47768b57e452d714efe448a IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0004996610
0xfb4759b5f0fb93424c5680f31b3ce5594d81e1fc1762def784bb02f33ed560eeTrade239397262021-03-16 3:48:5263 days 16 hrs ago0x25cb39a8b252b0a4b47768b57e452d714efe448a IN  0xc93c8cde0edf4963ea1eea156099b285a945210a0 Ether0.0004996610
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Latest 25 internal transaction
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0x06304085823c58ccf9f4a7642c76aec4780baa939932e0b2507429ad26d1eed8247137482021-05-07 14:19:2811 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x4f96fe3b7a6cf9725f59d353f723c1bdb64ca6aa0 Ether
0x06304085823c58ccf9f4a7642c76aec4780baa939932e0b2507429ad26d1eed8247137482021-05-07 14:19:2811 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0xd0a1e359811322d97991e03f863a0c30c2cf029c0 Ether
0x06304085823c58ccf9f4a7642c76aec4780baa939932e0b2507429ad26d1eed8247137482021-05-07 14:19:2811 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x85758e4b2dd825ee42c97800fb46db6c7c1e500f0 Ether
0x06304085823c58ccf9f4a7642c76aec4780baa939932e0b2507429ad26d1eed8247137482021-05-07 14:19:2811 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x28a87dcca3322f90b3a4ce80cee499869efdbf110 Ether
0x06304085823c58ccf9f4a7642c76aec4780baa939932e0b2507429ad26d1eed8247137482021-05-07 14:19:2811 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x9048278ca7e874f9338e4898c436ab07aa4547010 Ether
0x06304085823c58ccf9f4a7642c76aec4780baa939932e0b2507429ad26d1eed8247137482021-05-07 14:19:2811 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x85758e4b2dd825ee42c97800fb46db6c7c1e500f0 Ether
0x06304085823c58ccf9f4a7642c76aec4780baa939932e0b2507429ad26d1eed8247137482021-05-07 14:19:2811 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x9048278ca7e874f9338e4898c436ab07aa4547010 Ether
0x06304085823c58ccf9f4a7642c76aec4780baa939932e0b2507429ad26d1eed8247137482021-05-07 14:19:2811 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x85758e4b2dd825ee42c97800fb46db6c7c1e500f0 Ether
0x4f631e67924d9ac780c728f44428a1b5faa9f60abeecad1a3adf00b64b3cf1bb247136142021-05-07 14:10:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x4f96fe3b7a6cf9725f59d353f723c1bdb64ca6aa0 Ether
0x4f631e67924d9ac780c728f44428a1b5faa9f60abeecad1a3adf00b64b3cf1bb247136142021-05-07 14:10:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0xd0a1e359811322d97991e03f863a0c30c2cf029c0 Ether
0x4f631e67924d9ac780c728f44428a1b5faa9f60abeecad1a3adf00b64b3cf1bb247136142021-05-07 14:10:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x85758e4b2dd825ee42c97800fb46db6c7c1e500f0 Ether
0x4f631e67924d9ac780c728f44428a1b5faa9f60abeecad1a3adf00b64b3cf1bb247136142021-05-07 14:10:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x28a87dcca3322f90b3a4ce80cee499869efdbf110 Ether
0x4f631e67924d9ac780c728f44428a1b5faa9f60abeecad1a3adf00b64b3cf1bb247136142021-05-07 14:10:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x9048278ca7e874f9338e4898c436ab07aa4547010 Ether
0x4f631e67924d9ac780c728f44428a1b5faa9f60abeecad1a3adf00b64b3cf1bb247136142021-05-07 14:10:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x85758e4b2dd825ee42c97800fb46db6c7c1e500f0 Ether
0x4f631e67924d9ac780c728f44428a1b5faa9f60abeecad1a3adf00b64b3cf1bb247136142021-05-07 14:10:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x9048278ca7e874f9338e4898c436ab07aa4547010 Ether
0x4f631e67924d9ac780c728f44428a1b5faa9f60abeecad1a3adf00b64b3cf1bb247136142021-05-07 14:10:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x85758e4b2dd825ee42c97800fb46db6c7c1e500f0 Ether
0x944c5d76cbc126748849a33b5586dfed2f9f287c6305b0b00446671c5a399f6c247135862021-05-07 14:08:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x4f96fe3b7a6cf9725f59d353f723c1bdb64ca6aa0 Ether
0x944c5d76cbc126748849a33b5586dfed2f9f287c6305b0b00446671c5a399f6c247135862021-05-07 14:08:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0xd0a1e359811322d97991e03f863a0c30c2cf029c0 Ether
0x944c5d76cbc126748849a33b5586dfed2f9f287c6305b0b00446671c5a399f6c247135862021-05-07 14:08:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x85758e4b2dd825ee42c97800fb46db6c7c1e500f0 Ether
0x944c5d76cbc126748849a33b5586dfed2f9f287c6305b0b00446671c5a399f6c247135862021-05-07 14:08:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x28a87dcca3322f90b3a4ce80cee499869efdbf110 Ether
0x944c5d76cbc126748849a33b5586dfed2f9f287c6305b0b00446671c5a399f6c247135862021-05-07 14:08:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x9048278ca7e874f9338e4898c436ab07aa4547010 Ether
0x944c5d76cbc126748849a33b5586dfed2f9f287c6305b0b00446671c5a399f6c247135862021-05-07 14:08:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x85758e4b2dd825ee42c97800fb46db6c7c1e500f0 Ether
0x944c5d76cbc126748849a33b5586dfed2f9f287c6305b0b00446671c5a399f6c247135862021-05-07 14:08:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x9048278ca7e874f9338e4898c436ab07aa4547010 Ether
0x944c5d76cbc126748849a33b5586dfed2f9f287c6305b0b00446671c5a399f6c247135862021-05-07 14:08:3211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x85758e4b2dd825ee42c97800fb46db6c7c1e500f0 Ether
0x29006bedc04358f2b5ce8242ac02a8b7e9d2bd617e2a8473da3a0fdabd2e7259247135462021-05-07 14:05:5211 days 5 hrs ago 0xc93c8cde0edf4963ea1eea156099b285a945210a 0x4f96fe3b7a6cf9725f59d353f723c1bdb64ca6aa0 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
TradeModule

Compiler Version
v0.6.10+commit.00c0fcaf

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, Apache-2.0 license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2020-09-30
*/

// Dependency file: @openzeppelin/contracts/utils/Address.sol



// pragma solidity ^0.6.2;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [// importANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * // importANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// Dependency file: contracts/interfaces/ISetValuer.sol

/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


*/
// pragma solidity 0.6.10;

// import { ISetToken } from "../interfaces/ISetToken.sol";

interface ISetValuer {
    function calculateSetTokenValuation(ISetToken _setToken, address _quoteAsset) external view returns (uint256);
}
// Dependency file: contracts/interfaces/IPriceOracle.sol

/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


*/
// pragma solidity 0.6.10;

/**
 * @title IPriceOracle
 * @author Set Protocol
 *
 * Interface for interacting with PriceOracle
 */
interface IPriceOracle {

    /* ============ Functions ============ */

    function getPrice(address _assetOne, address _assetTwo) external view returns (uint256);
    function masterQuoteAsset() external view returns (address);
}
// Dependency file: @openzeppelin/contracts/token/ERC20/SafeERC20.sol



// pragma solidity ^0.6.0;

// import "./IERC20.sol";
// import "../../math/SafeMath.sol";
// import "../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// Dependency file: @openzeppelin/contracts/math/SignedSafeMath.sol



// pragma solidity ^0.6.0;

/**
 * @title SignedSafeMath
 * @dev Signed math operations with safety checks that revert on error.
 */
library SignedSafeMath {
    int256 constant private _INT256_MIN = -2**255;

        /**
     * @dev Returns the multiplication of two signed integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(int256 a, int256 b) internal pure returns (int256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        require(!(a == -1 && b == _INT256_MIN), "SignedSafeMath: multiplication overflow");

        int256 c = a * b;
        require(c / a == b, "SignedSafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two signed integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(int256 a, int256 b) internal pure returns (int256) {
        require(b != 0, "SignedSafeMath: division by zero");
        require(!(b == -1 && a == _INT256_MIN), "SignedSafeMath: division overflow");

        int256 c = a / b;

        return c;
    }

    /**
     * @dev Returns the subtraction of two signed integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a - b;
        require((b >= 0 && c <= a) || (b < 0 && c > a), "SignedSafeMath: subtraction overflow");

        return c;
    }

    /**
     * @dev Returns the addition of two signed integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a + b;
        require((b >= 0 && c >= a) || (b < 0 && c < a), "SignedSafeMath: addition overflow");

        return c;
    }
}

// Dependency file: contracts/protocol/lib/ResourceIdentifier.sol

/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


*/

// pragma solidity 0.6.10;

// import { IController } from "../../interfaces/IController.sol";
// import { IIntegrationRegistry } from "../../interfaces/IIntegrationRegistry.sol";
// import { IPriceOracle } from "../../interfaces/IPriceOracle.sol";
// import { ISetValuer } from "../../interfaces/ISetValuer.sol";

/**
 * @title ResourceIdentifier
 * @author Set Protocol
 *
 * A collection of utility functions to fetch information related to Resource contracts in the system
 */
library ResourceIdentifier {

    // IntegrationRegistry will always be resource ID 0 in the system
    uint256 constant internal INTEGRATION_REGISTRY_RESOURCE_ID = 0;
    // PriceOracle will always be resource ID 1 in the system
    uint256 constant internal PRICE_ORACLE_RESOURCE_ID = 1;
    // SetValuer resource will always be resource ID 2 in the system
    uint256 constant internal SET_VALUER_RESOURCE_ID = 2;

    /* ============ Internal ============ */

    /**
     * Gets the instance of integration registry stored on Controller. Note: IntegrationRegistry is stored as index 0 on
     * the Controller
     */
    function getIntegrationRegistry(IController _controller) internal view returns (IIntegrationRegistry) {
        return IIntegrationRegistry(_controller.resourceId(INTEGRATION_REGISTRY_RESOURCE_ID));
    }

    /**
     * Gets instance of price oracle on Controller. Note: PriceOracle is stored as index 1 on the Controller
     */
    function getPriceOracle(IController _controller) internal view returns (IPriceOracle) {
        return IPriceOracle(_controller.resourceId(PRICE_ORACLE_RESOURCE_ID));
    }

    /**
     * Gets the instance of Set valuer on Controller. Note: SetValuer is stored as index 2 on the Controller
     */
    function getSetValuer(IController _controller) internal view returns (ISetValuer) {
        return ISetValuer(_controller.resourceId(SET_VALUER_RESOURCE_ID));
    }
}
// Dependency file: contracts/interfaces/IModule.sol

/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


*/
// pragma solidity 0.6.10;


/**
 * @title IModule
 * @author Set Protocol
 *
 * Interface for interacting with Modules.
 */
interface IModule {
    /**
     * Called by a SetToken to notify that this module was removed from the Set token. Any logic can be included
     * in case checks need to be made or state needs to be cleared.
     */
    function removeModule() external;
}
// Dependency file: contracts/lib/ExplicitERC20.sol

/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


*/

// pragma solidity 0.6.10;

// import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
// import { SafeMath } from "@openzeppelin/contracts/math/SafeMath.sol";

/**
 * @title ExplicitERC20
 * @author Set Protocol
 *
 * Utility functions for ERC20 transfers that require the explicit amount to be transferred.
 */
library ExplicitERC20 {
    using SafeMath for uint256;

    /**
     * When given allowance, transfers a token from the "_from" to the "_to" of quantity "_quantity".
     * Ensures that the recipient has received the correct quantity (ie no fees taken on transfer)
     *
     * @param _token           ERC20 token to approve
     * @param _from            The account to transfer tokens from
     * @param _to              The account to transfer tokens to
     * @param _quantity        The quantity to transfer
     */
    function transferFrom(
        IERC20 _token,
        address _from,
        address _to,
        uint256 _quantity
    )
        internal
    {
        // Call specified ERC20 contract to transfer tokens (via proxy).
        if (_quantity > 0) {
            uint256 existingBalance = _token.balanceOf(_to);

            SafeERC20.safeTransferFrom(
                _token,
                _from,
                _to,
                _quantity
            );

            uint256 newBalance = _token.balanceOf(_to);

            // Verify transfer quantity is reflected in balance
            require(
                newBalance == existingBalance.add(_quantity),
                "Invalid post transfer balance"
            );
        }
    }
}

// Dependency file: contracts/lib/PreciseUnitMath.sol

/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


*/

// pragma solidity 0.6.10;
// pragma experimental ABIEncoderV2;

// import { SafeMath } from "@openzeppelin/contracts/math/SafeMath.sol";
// import { SignedSafeMath } from "@openzeppelin/contracts/math/SignedSafeMath.sol";


/**
 * @title PreciseUnitMath
 * @author Set Protocol
 *
 * Arithmetic for fixed-point numbers with 18 decimals of precision. Some functions taken from
 * dYdX's BaseMath library.
 *
 * CHANGELOG:
 * - 9/21/20: Added safePower function
 */
library PreciseUnitMath {
    using SafeMath for uint256;
    using SignedSafeMath for int256;

    // The number One in precise units.
    uint256 constant internal PRECISE_UNIT = 10 ** 18;
    int256 constant internal PRECISE_UNIT_INT = 10 ** 18;

    // Max unsigned integer value
    uint256 constant internal MAX_UINT_256 = type(uint256).max;
    // Max and min signed integer value
    int256 constant internal MAX_INT_256 = type(int256).max;
    int256 constant internal MIN_INT_256 = type(int256).min;

    /**
     * @dev Getter function since constants can't be read directly from libraries.
     */
    function preciseUnit() internal pure returns (uint256) {
        return PRECISE_UNIT;
    }

    /**
     * @dev Getter function since constants can't be read directly from libraries.
     */
    function preciseUnitInt() internal pure returns (int256) {
        return PRECISE_UNIT_INT;
    }

    /**
     * @dev Getter function since constants can't be read directly from libraries.
     */
    function maxUint256() internal pure returns (uint256) {
        return MAX_UINT_256;
    }

    /**
     * @dev Getter function since constants can't be read directly from libraries.
     */
    function maxInt256() internal pure returns (int256) {
        return MAX_INT_256;
    }

    /**
     * @dev Getter function since constants can't be read directly from libraries.
     */
    function minInt256() internal pure returns (int256) {
        return MIN_INT_256;
    }

    /**
     * @dev Multiplies value a by value b (result is rounded down). It's assumed that the value b is the significand
     * of a number with 18 decimals precision.
     */
    function preciseMul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a.mul(b).div(PRECISE_UNIT);
    }

    /**
     * @dev Multiplies value a by value b (result is rounded towards zero). It's assumed that the value b is the
     * significand of a number with 18 decimals precision.
     */
    function preciseMul(int256 a, int256 b) internal pure returns (int256) {
        return a.mul(b).div(PRECISE_UNIT_INT);
    }

    /**
     * @dev Multiplies value a by value b (result is rounded up). It's assumed that the value b is the significand
     * of a number with 18 decimals precision.
     */
    function preciseMulCeil(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0 || b == 0) {
            return 0;
        }
        return a.mul(b).sub(1).div(PRECISE_UNIT).add(1);
    }

    /**
     * @dev Divides value a by value b (result is rounded down).
     */
    function preciseDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        return a.mul(PRECISE_UNIT).div(b);
    }


    /**
     * @dev Divides value a by value b (result is rounded towards 0).
     */
    function preciseDiv(int256 a, int256 b) internal pure returns (int256) {
        return a.mul(PRECISE_UNIT_INT).div(b);
    }

    /**
     * @dev Divides value a by value b (result is rounded up or away from 0).
     */
    function preciseDivCeil(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, "Cant divide by 0");

        return a > 0 ? a.mul(PRECISE_UNIT).sub(1).div(b).add(1) : 0;
    }

    /**
     * @dev Divides value a by value b (result is rounded down - positive numbers toward 0 and negative away from 0).
     */
    function divDown(int256 a, int256 b) internal pure returns (int256) {
        require(b != 0, "Cant divide by 0");
        require(a != MIN_INT_256 || b != -1, "Invalid input");

        int256 result = a.div(b);
        if (a ^ b < 0 && a % b != 0) {
            result -= 1;
        }

        return result;
    }

    /**
     * @dev Multiplies value a by value b where rounding is towards the lesser number. 
     * (positive values are rounded towards zero and negative values are rounded away from 0). 
     */
    function conservativePreciseMul(int256 a, int256 b) internal pure returns (int256) {
        return divDown(a.mul(b), PRECISE_UNIT_INT);
    }

    /**
     * @dev Divides value a by value b where rounding is towards the lesser number. 
     * (positive values are rounded towards zero and negative values are rounded away from 0). 
     */
    function conservativePreciseDiv(int256 a, int256 b) internal pure returns (int256) {
        return divDown(a.mul(PRECISE_UNIT_INT), b);
    }

    /**
    * @dev Performs the power on a specified value, reverts on overflow.
    */
    function safePower(
        uint256 a,
        uint256 pow
    )
        internal
        pure
        returns (uint256)
    {
        require(a > 0, "Value must be positive");

        uint256 result = 1;
        for (uint256 i = 0; i < pow; i++){
            uint256 previousResult = result;

            // Using safemath multiplication prevents overflows
            result = previousResult.mul(a);
        }

        return result;
    }
}
// Dependency file: contracts/protocol/lib/Position.sol

/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


*/

// pragma solidity 0.6.10;
// pragma experimental "ABIEncoderV2";

// import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import { SafeCast } from "@openzeppelin/contracts/utils/SafeCast.sol";
// import { SafeMath } from "@openzeppelin/contracts/math/SafeMath.sol";
// import { SignedSafeMath } from "@openzeppelin/contracts/math/SignedSafeMath.sol";

// import { ISetToken } from "../../interfaces/ISetToken.sol";
// import { PreciseUnitMath } from "../../lib/PreciseUnitMath.sol";


/**
 * @title Position
 * @author Set Protocol
 *
 * Collection of helper functions for handling and updating SetToken Positions
 */
library Position {
    using SafeCast for uint256;
    using SafeMath for uint256;
    using SafeCast for int256;
    using SignedSafeMath for int256;
    using PreciseUnitMath for uint256;

    /* ============ Helper ============ */

    /**
     * Returns whether the SetToken has a default position for a given component (if the real unit is > 0)
     */
    function hasDefaultPosition(ISetToken _setToken, address _component) internal view returns(bool) {
        return _setToken.getDefaultPositionRealUnit(_component) > 0;
    }

    /**
     * Returns whether the SetToken has an external position for a given component (if # of position modules is > 0)
     */
    function hasExternalPosition(ISetToken _setToken, address _component) internal view returns(bool) {
        return _setToken.getExternalPositionModules(_component).length > 0;
    }
    
    /**
     * Returns whether the SetToken component default position real unit is greater than or equal to units passed in.
     */
    function hasSufficientDefaultUnits(ISetToken _setToken, address _component, uint256 _unit) internal view returns(bool) {
        return _setToken.getDefaultPositionRealUnit(_component) >= _unit.toInt256();
    }

    /**
     * Returns whether the SetToken component external position is greater than or equal to the real units passed in.
     */
    function hasSufficientExternalUnits(
        ISetToken _setToken,
        address _component,
        address _positionModule,
        uint256 _unit
    )
        internal
        view
        returns(bool)
    {
       return _setToken.getExternalPositionRealUnit(_component, _positionModule) >= _unit.toInt256();    
    }

    /**
     * If the position does not exist, create a new Position and add to the SetToken. If it already exists,
     * then set the position units. If the new units is 0, remove the position. Handles adding/removing of 
     * components where needed (in light of potential external positions).
     *
     * @param _setToken           Address of SetToken being modified
     * @param _component          Address of the component
     * @param _newUnit            Quantity of Position units - must be >= 0
     */
    function editDefaultPosition(ISetToken _setToken, address _component, uint256 _newUnit) internal {
        bool isPositionFound = hasDefaultPosition(_setToken, _component);
        if (!isPositionFound && _newUnit > 0) {
            // If there is no Default Position and no External Modules, then component does not exist
            if (!hasExternalPosition(_setToken, _component)) {
                _setToken.addComponent(_component);
            }
        } else if (isPositionFound && _newUnit == 0) {
            // If there is a Default Position and no external positions, remove the component
            if (!hasExternalPosition(_setToken, _component)) {
                _setToken.removeComponent(_component);
            }
        }

        _setToken.editDefaultPositionUnit(_component, _newUnit.toInt256());
    }

    /**
     * Update an external position and remove and external positions or components if necessary. The logic flows as follows:
     * 1) If component is not already added then add component and external position. 
     * 2) If component is added but no existing external position using the passed module exists then add the external position.
     * 3) If the existing position is being added to then just update the unit and data
     * 4) If the position is being closed and no other external positions or default positions are associated with the component
     *    then untrack the component and remove external position.
     * 5) If the position is being closed and other existing positions still exist for the component then just remove the
     *    external position.
     *
     * @param _setToken         SetToken being updated
     * @param _component        Component position being updated
     * @param _module           Module external position is associated with
     * @param _newUnit          Position units of new external position
     * @param _data             Arbitrary data associated with the position
     */
    function editExternalPosition(
        ISetToken _setToken,
        address _component,
        address _module,
        int256 _newUnit,
        bytes memory _data
    )
        internal
    {
        if (_newUnit != 0) {
            if (!_setToken.isComponent(_component)) {
                _setToken.addComponent(_component);
                _setToken.addExternalPositionModule(_component, _module);
            } else if (!_setToken.isExternalPositionModule(_component, _module)) {
                _setToken.addExternalPositionModule(_component, _module);
            }
            _setToken.editExternalPositionUnit(_component, _module, _newUnit);
            _setToken.editExternalPositionData(_component, _module, _data);
        } else {
            require(_data.length == 0, "Passed data must be null");
            // If no default or external position remaining then remove component from components array
            address[] memory positionModules = _setToken.getExternalPositionModules(_component);
            if (_setToken.getDefaultPositionRealUnit(_component) == 0 && positionModules.length == 1) {
                require(positionModules[0] == _module, "External positions must be 0 to remove component");
                _setToken.removeComponent(_component);
            }
            _setToken.removeExternalPositionModule(_component, _module);
        }
    }

    /**
     * Get total notional amount of Default position
     *
     * @param _setTokenSupply     Supply of SetToken in precise units (10^18)
     * @param _positionUnit       Quantity of Position units
     *
     * @return                    Total notional amount of units
     */
    function getDefaultTotalNotional(uint256 _setTokenSupply, uint256 _positionUnit) internal pure returns (uint256) {
        return _setTokenSupply.preciseMul(_positionUnit);
    }

    /**
     * Get position unit from total notional amount
     *
     * @param _setTokenSupply     Supply of SetToken in precise units (10^18)
     * @param _totalNotional      Total notional amount of component prior to
     * @return                    Default position unit
     */
    function getDefaultPositionUnit(uint256 _setTokenSupply, uint256 _totalNotional) internal pure returns (uint256) {
        return _totalNotional.preciseDiv(_setTokenSupply);
    }

    /**
     * Get the total tracked balance - total supply * position unit
     *
     * @param _setToken           Address of the SetToken
     * @param _component          Address of the component
     * @return                    Notional tracked balance
     */
    function getDefaultTrackedBalance(ISetToken _setToken, address _component) internal view returns(uint256) {
        int256 positionUnit = _setToken.getDefaultPositionRealUnit(_component); 
        return _setToken.totalSupply().preciseMul(positionUnit.toUint256());
    }

    /**
     * Calculates the new default position unit and performs the edit with the new unit
     *
     * @param _setToken                 Address of the SetToken
     * @param _component                Address of the component
     * @param _setTotalSupply           Current SetToken supply
     * @param _componentPreviousBalance Pre-action component balance
     * @return                          Current component balance
     * @return                          Previous position unit
     * @return                          New position unit
     */
    function calculateAndEditDefaultPosition(
        ISetToken _setToken,
        address _component,
        uint256 _setTotalSupply,
        uint256 _componentPreviousBalance
    )
        internal
        returns(uint256, uint256, uint256)
    {
        uint256 currentBalance = IERC20(_component).balanceOf(address(_setToken));
        uint256 positionUnit = _setToken.getDefaultPositionRealUnit(_component).toUint256();

        uint256 newTokenUnit = calculateDefaultEditPositionUnit(
            _setTotalSupply,
            _componentPreviousBalance,
            currentBalance,
            positionUnit
        );

        editDefaultPosition(_setToken, _component, newTokenUnit);

        return (currentBalance, positionUnit, newTokenUnit);
    }

    /**
     * Calculate the new position unit given total notional values pre and post executing an action that changes SetToken state
     * The intention is to make updates to the units without accidentally picking up airdropped assets as well.
     *
     * @param _setTokenSupply     Supply of SetToken in precise units (10^18)
     * @param _preTotalNotional   Total notional amount of component prior to executing action
     * @param _postTotalNotional  Total notional amount of component after the executing action
     * @param _prePositionUnit    Position unit of SetToken prior to executing action
     * @return                    New position unit
     */
    function calculateDefaultEditPositionUnit(
        uint256 _setTokenSupply,
        uint256 _preTotalNotional,
        uint256 _postTotalNotional,
        uint256 _prePositionUnit
    )
        internal
        pure
        returns (uint256)
    {
        // If pre action total notional amount is greater then subtract post action total notional and calculate new position units
        uint256 airdroppedAmount = _preTotalNotional.sub(_prePositionUnit.preciseMul(_setTokenSupply));
        return _postTotalNotional.sub(airdroppedAmount).preciseDivCeil(_setTokenSupply);
    }
}

// Dependency file: contracts/protocol/lib/ModuleBase.sol

/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


*/

// pragma solidity 0.6.10;

// import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

// import { ExplicitERC20 } from "../../lib/ExplicitERC20.sol";
// import { IController } from "../../interfaces/IController.sol";
// import { IModule } from "../../interfaces/IModule.sol";
// import { ISetToken } from "../../interfaces/ISetToken.sol";
// import { Invoke } from "./Invoke.sol";
// import { PreciseUnitMath } from "../../lib/PreciseUnitMath.sol";
// import { ResourceIdentifier } from "./ResourceIdentifier.sol";

/**
 * @title ModuleBase
 * @author Set Protocol
 *
 * Abstract class that houses common Module-related state and functions.
 */
abstract contract ModuleBase is IModule {
    using PreciseUnitMath for uint256;
    using Invoke for ISetToken;
    using ResourceIdentifier for IController;

    /* ============ State Variables ============ */

    // Address of the controller
    IController public controller;

    /* ============ Modifiers ============ */

    modifier onlyManagerAndValidSet(ISetToken _setToken) { 
        require(isSetManager(_setToken, msg.sender), "Must be the SetToken manager");
        require(isSetValidAndInitialized(_setToken), "Must be a valid and initialized SetToken");
        _;
    }

    modifier onlySetManager(ISetToken _setToken, address _caller) {
        require(isSetManager(_setToken, _caller), "Must be the SetToken manager");
        _;
    }

    modifier onlyValidAndInitializedSet(ISetToken _setToken) {
        require(isSetValidAndInitialized(_setToken), "Must be a valid and initialized SetToken");
        _;
    }

    /**
     * Throws if the sender is not a SetToken's module or module not enabled
     */
    modifier onlyModule(ISetToken _setToken) {
        require(
            _setToken.moduleStates(msg.sender) == ISetToken.ModuleState.INITIALIZED,
            "Only the module can call"
        );

        require(
            controller.isModule(msg.sender),
            "Module must be enabled on controller"
        );
        _;
    }

    /**
     * Utilized during module initializations to check that the module is in pending state
     * and that the SetToken is valid
     */
    modifier onlyValidAndPendingSet(ISetToken _setToken) {
        require(controller.isSet(address(_setToken)), "Must be controller-enabled SetToken");
        require(isSetPendingInitialization(_setToken), "Must be pending initialization");        
        _;
    }

    /* ============ Constructor ============ */

    /**
     * Set state variables and map asset pairs to their oracles
     *
     * @param _controller             Address of controller contract
     */
    constructor(IController _controller) public {
        controller = _controller;
    }

    /* ============ Internal Functions ============ */

    /**
     * Transfers tokens from an address (that has set allowance on the module).
     *
     * @param  _token          The address of the ERC20 token
     * @param  _from           The address to transfer from
     * @param  _to             The address to transfer to
     * @param  _quantity       The number of tokens to transfer
     */
    function transferFrom(IERC20 _token, address _from, address _to, uint256 _quantity) internal {
        ExplicitERC20.transferFrom(_token, _from, _to, _quantity);
    }

    /**
     * Gets the integration for the module with the passed in name. Validates that the address is not empty
     */
    function getAndValidateAdapter(string memory _integrationName) internal view returns(address) { 
        bytes32 integrationHash = getNameHash(_integrationName);
        return getAndValidateAdapterWithHash(integrationHash);
    }

    /**
     * Gets the integration for the module with the passed in hash. Validates that the address is not empty
     */
    function getAndValidateAdapterWithHash(bytes32 _integrationHash) internal view returns(address) { 
        address adapter = controller.getIntegrationRegistry().getIntegrationAdapterWithHash(
            address(this),
            _integrationHash
        );

        require(adapter != address(0), "Must be valid adapter"); 
        return adapter;
    }

    /**
     * Gets the total fee for this module of the passed in index (fee % * quantity)
     */
    function getModuleFee(uint256 _feeIndex, uint256 _quantity) internal view returns(uint256) {
        uint256 feePercentage = controller.getModuleFee(address(this), _feeIndex);
        return _quantity.preciseMul(feePercentage);
    }

    /**
     * Pays the _feeQuantity from the _setToken denominated in _token to the protocol fee recipient
     */
    function payProtocolFeeFromSetToken(ISetToken _setToken, address _token, uint256 _feeQuantity) internal {
        if (_feeQuantity > 0) {
            _setToken.strictInvokeTransfer(_token, controller.feeRecipient(), _feeQuantity); 
        }
    }

    /**
     * Returns true if the module is in process of initialization on the SetToken
     */
    function isSetPendingInitialization(ISetToken _setToken) internal view returns(bool) {
        return _setToken.isPendingModule(address(this));
    }

    /**
     * Returns true if the address is the SetToken's manager
     */
    function isSetManager(ISetToken _setToken, address _toCheck) internal view returns(bool) {
        return _setToken.manager() == _toCheck;
    }

    /**
     * Returns true if SetToken must be enabled on the controller 
     * and module is registered on the SetToken
     */
    function isSetValidAndInitialized(ISetToken _setToken) internal view returns(bool) {
        return controller.isSet(address(_setToken)) &&
            _setToken.isInitializedModule(address(this));
    }

    /**
     * Hashes the string and returns a bytes32 value
     */
    function getNameHash(string memory _name) internal pure returns(bytes32) {
        return keccak256(bytes(_name));
    }
}
// Dependency file: @openzeppelin/contracts/token/ERC20/IERC20.sol



// pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * // importANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// Dependency file: contracts/interfaces/ISetToken.sol

/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


*/
// pragma solidity 0.6.10;
// pragma experimental "ABIEncoderV2";

// import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/**
 * @title ISetToken
 * @author Set Protocol
 *
 * Interface for operating with SetTokens.
 */
interface ISetToken is IERC20 {

    /* ============ Enums ============ */

    enum ModuleState {
        NONE,
        PENDING,
        INITIALIZED
    }

    /* ============ Structs ============ */
    /**
     * The base definition of a SetToken Position
     *
     * @param component           Address of token in the Position
     * @param module              If not in default state, the address of associated module
     * @param unit                Each unit is the # of components per 10^18 of a SetToken
     * @param positionState       Position ENUM. Default is 0; External is 1
     * @param data                Arbitrary data
     */
    struct Position {
        address component;
        address module;
        int256 unit;
        uint8 positionState;
        bytes data;
    }

    /**
     * A struct that stores a component's cash position details and external positions
     * This data structure allows O(1) access to a component's cash position units and 
     * virtual units.
     *
     * @param virtualUnit               Virtual value of a component's DEFAULT position. Stored as virtual for efficiency
     *                                  updating all units at once via the position multiplier. Virtual units are achieved
     *                                  by dividing a "real" value by the "positionMultiplier"
     * @param componentIndex            
     * @param externalPositionModules   List of external modules attached to each external position. Each module
     *                                  maps to an external position
     * @param externalPositions         Mapping of module => ExternalPosition struct for a given component
     */
    struct ComponentPosition {
      int256 virtualUnit;
      address[] externalPositionModules;
      mapping(address => ExternalPosition) externalPositions;
    }

    /**
     * A struct that stores a component's external position details including virtual unit and any
     * auxiliary data.
     *
     * @param virtualUnit       Virtual value of a component's EXTERNAL position.
     * @param data              Arbitrary data
     */
    struct ExternalPosition {
      int256 virtualUnit;
      bytes data;
    }


    /* ============ Functions ============ */
    
    function addComponent(address _component) external;
    function removeComponent(address _component) external;
    function editDefaultPositionUnit(address _component, int256 _realUnit) external;
    function addExternalPositionModule(address _component, address _positionModule) external;
    function removeExternalPositionModule(address _component, address _positionModule) external;
    function editExternalPositionUnit(address _component, address _positionModule, int256 _realUnit) external;
    function editExternalPositionData(address _component, address _positionModule, bytes calldata _data) external;

    function invoke(address _target, uint256 _value, bytes calldata _data) external returns(bytes memory);

    function editPositionMultiplier(int256 _newMultiplier) external;

    function mint(address _account, uint256 _quantity) external;
    function burn(address _account, uint256 _quantity) external;

    function lock() external;
    function unlock() external;

    function addModule(address _module) external;
    function removeModule(address _module) external;
    function initializeModule() external;

    function setManager(address _manager) external;

    function manager() external view returns (address);
    function moduleStates(address _module) external view returns (ModuleState);
    function getModules() external view returns (address[] memory);
    
    function getDefaultPositionRealUnit(address _component) external view returns(int256);
    function getExternalPositionRealUnit(address _component, address _positionModule) external view returns(int256);
    function getComponents() external view returns(address[] memory);
    function getExternalPositionModules(address _component) external view returns(address[] memory);
    function getExternalPositionData(address _component, address _positionModule) external view returns(bytes memory);
    function isExternalPositionModule(address _component, address _module) external view returns(bool);
    function isComponent(address _component) external view returns(bool);
    
    function positionMultiplier() external view returns (int256);
    function getPositions() external view returns (Position[] memory);
    function getTotalComponentRealUnits(address _component) external view returns(int256);

    function isInitializedModule(address _module) external view returns(bool);
    function isPendingModule(address _module) external view returns(bool);
    function isLocked() external view returns (bool);
}
// Dependency file: contracts/protocol/lib/Invoke.sol

/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


*/

// pragma solidity 0.6.10;

// import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import { SafeMath } from "@openzeppelin/contracts/math/SafeMath.sol";

// import { ISetToken } from "../../interfaces/ISetToken.sol";


/**
 * @title Invoke
 * @author Set Protocol
 *
 * A collection of common utility functions for interacting with the SetToken's invoke function
 */
library Invoke {
    using SafeMath for uint256;

    /* ============ Internal ============ */

    /**
     * Instructs the SetToken to set approvals of the ERC20 token to a spender.
     *
     * @param _setToken        SetToken instance to invoke
     * @param _token           ERC20 token to approve
     * @param _spender         The account allowed to spend the SetToken's balance
     * @param _quantity        The quantity of allowance to allow
     */
    function invokeApprove(
        ISetToken _setToken,
        address _token,
        address _spender,
        uint256 _quantity
    )
        internal
    {
        bytes memory callData = abi.encodeWithSignature("approve(address,uint256)", _spender, _quantity);
        _setToken.invoke(_token, 0, callData);
    }

    /**
     * Instructs the SetToken to transfer the ERC20 token to a recipient.
     *
     * @param _setToken        SetToken instance to invoke
     * @param _token           ERC20 token to transfer
     * @param _to              The recipient account
     * @param _quantity        The quantity to transfer
     */
    function invokeTransfer(
        ISetToken _setToken,
        address _token,
        address _to,
        uint256 _quantity
    )
        internal
    {
        if (_quantity > 0) {
            bytes memory callData = abi.encodeWithSignature("transfer(address,uint256)", _to, _quantity);
            _setToken.invoke(_token, 0, callData);
        }
    }

    /**
     * Instructs the SetToken to transfer the ERC20 token to a recipient.
     * The new SetToken balance must equal the existing balance less the quantity transferred
     *
     * @param _setToken        SetToken instance to invoke
     * @param _token           ERC20 token to transfer
     * @param _to              The recipient account
     * @param _quantity        The quantity to transfer
     */
    function strictInvokeTransfer(
        ISetToken _setToken,
        address _token,
        address _to,
        uint256 _quantity
    )
        internal
    {
        if (_quantity > 0) {
            // Retrieve current balance of token for the SetToken
            uint256 existingBalance = IERC20(_token).balanceOf(address(_setToken));

            Invoke.invokeTransfer(_setToken, _token, _to, _quantity);

            // Get new balance of transferred token for SetToken
            uint256 newBalance = IERC20(_token).balanceOf(address(_setToken));

            // Verify only the transfer quantity is subtracted
            require(
                newBalance == existingBalance.sub(_quantity),
                "Invalid post transfer balance"
            );
        }
    }

    /**
     * Instructs the SetToken to unwrap the passed quantity of WETH
     *
     * @param _setToken        SetToken instance to invoke
     * @param _weth            WETH address
     * @param _quantity        The quantity to unwrap
     */
    function invokeUnwrapWETH(ISetToken _setToken, address _weth, uint256 _quantity) internal {
        bytes memory callData = abi.encodeWithSignature("withdraw(uint256)", _quantity);
        _setToken.invoke(_weth, 0, callData);
    }

    /**
     * Instructs the SetToken to wrap the passed quantity of ETH
     *
     * @param _setToken        SetToken instance to invoke
     * @param _weth            WETH address
     * @param _quantity        The quantity to unwrap
     */
    function invokeWrapWETH(ISetToken _setToken, address _weth, uint256 _quantity) internal {
        bytes memory callData = abi.encodeWithSignature("deposit()");
        _setToken.invoke(_weth, _quantity, callData);
    }
}
// Dependency file: contracts/interfaces/IIntegrationRegistry.sol

/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


*/
// pragma solidity 0.6.10;

interface IIntegrationRegistry {
    function addIntegration(address _module, string memory _id, address _wrapper) external;
    function getIntegrationAdapter(address _module, string memory _id) external view returns(address);
    function getIntegrationAdapterWithHash(address _module, bytes32 _id) external view returns(address);
    function isValidIntegration(address _module, string memory _id) external view returns(bool);
}
// Dependency file: contracts/interfaces/IExchangeAdapter.sol

/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


*/
// pragma solidity 0.6.10;

interface IExchangeAdapter {
    function getSpender() external view returns(address);
    function getTradeCalldata(
        address _fromToken,
        address _toToken,
        address _toAddress,
        uint256 _fromQuantity,
        uint256 _minToQuantity,
        bytes memory _data
    )
        external
        view
        returns (address, uint256, bytes memory);
}


// Dependency file: contracts/interfaces/IController.sol

/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


*/
// pragma solidity 0.6.10;

interface IController {
    function addSet(address _setToken) external;
    function feeRecipient() external view returns(address);
    function getModuleFee(address _module, uint256 _feeType) external view returns(uint256);
    function isModule(address _module) external view returns(bool);
    function isSet(address _setToken) external view returns(bool);
    function isSystemContract(address _contractAddress) external view returns (bool);
    function resourceId(uint256 _id) external view returns(address);
}
// Dependency file: @openzeppelin/contracts/utils/SafeCast.sol



// pragma solidity ^0.6.0;


/**
 * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow
 * checks.
 *
 * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can
 * easily result in undesired exploitation or bugs, since developers usually
 * assume that overflows raise errors. `SafeCast` restores this intuition by
 * reverting the transaction when such an operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 *
 * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing
 * all math on `uint256` and `int256` and then downcasting.
 */
library SafeCast {

    /**
     * @dev Returns the downcasted uint128 from uint256, reverting on
     * overflow (when the input is greater than largest uint128).
     *
     * Counterpart to Solidity's `uint128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     */
    function toUint128(uint256 value) internal pure returns (uint128) {
        require(value < 2**128, "SafeCast: value doesn\'t fit in 128 bits");
        return uint128(value);
    }

    /**
     * @dev Returns the downcasted uint64 from uint256, reverting on
     * overflow (when the input is greater than largest uint64).
     *
     * Counterpart to Solidity's `uint64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     */
    function toUint64(uint256 value) internal pure returns (uint64) {
        require(value < 2**64, "SafeCast: value doesn\'t fit in 64 bits");
        return uint64(value);
    }

    /**
     * @dev Returns the downcasted uint32 from uint256, reverting on
     * overflow (when the input is greater than largest uint32).
     *
     * Counterpart to Solidity's `uint32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     */
    function toUint32(uint256 value) internal pure returns (uint32) {
        require(value < 2**32, "SafeCast: value doesn\'t fit in 32 bits");
        return uint32(value);
    }

    /**
     * @dev Returns the downcasted uint16 from uint256, reverting on
     * overflow (when the input is greater than largest uint16).
     *
     * Counterpart to Solidity's `uint16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     */
    function toUint16(uint256 value) internal pure returns (uint16) {
        require(value < 2**16, "SafeCast: value doesn\'t fit in 16 bits");
        return uint16(value);
    }

    /**
     * @dev Returns the downcasted uint8 from uint256, reverting on
     * overflow (when the input is greater than largest uint8).
     *
     * Counterpart to Solidity's `uint8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits.
     */
    function toUint8(uint256 value) internal pure returns (uint8) {
        require(value < 2**8, "SafeCast: value doesn\'t fit in 8 bits");
        return uint8(value);
    }

    /**
     * @dev Converts a signed int256 into an unsigned uint256.
     *
     * Requirements:
     *
     * - input must be greater than or equal to 0.
     */
    function toUint256(int256 value) internal pure returns (uint256) {
        require(value >= 0, "SafeCast: value must be positive");
        return uint256(value);
    }

    /**
     * @dev Returns the downcasted int128 from int256, reverting on
     * overflow (when the input is less than smallest int128 or
     * greater than largest int128).
     *
     * Counterpart to Solidity's `int128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     *
     * _Available since v3.1._
     */
    function toInt128(int256 value) internal pure returns (int128) {
        require(value >= -2**127 && value < 2**127, "SafeCast: value doesn\'t fit in 128 bits");
        return int128(value);
    }

    /**
     * @dev Returns the downcasted int64 from int256, reverting on
     * overflow (when the input is less than smallest int64 or
     * greater than largest int64).
     *
     * Counterpart to Solidity's `int64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     *
     * _Available since v3.1._
     */
    function toInt64(int256 value) internal pure returns (int64) {
        require(value >= -2**63 && value < 2**63, "SafeCast: value doesn\'t fit in 64 bits");
        return int64(value);
    }

    /**
     * @dev Returns the downcasted int32 from int256, reverting on
     * overflow (when the input is less than smallest int32 or
     * greater than largest int32).
     *
     * Counterpart to Solidity's `int32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     *
     * _Available since v3.1._
     */
    function toInt32(int256 value) internal pure returns (int32) {
        require(value >= -2**31 && value < 2**31, "SafeCast: value doesn\'t fit in 32 bits");
        return int32(value);
    }

    /**
     * @dev Returns the downcasted int16 from int256, reverting on
     * overflow (when the input is less than smallest int16 or
     * greater than largest int16).
     *
     * Counterpart to Solidity's `int16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     *
     * _Available since v3.1._
     */
    function toInt16(int256 value) internal pure returns (int16) {
        require(value >= -2**15 && value < 2**15, "SafeCast: value doesn\'t fit in 16 bits");
        return int16(value);
    }

    /**
     * @dev Returns the downcasted int8 from int256, reverting on
     * overflow (when the input is less than smallest int8 or
     * greater than largest int8).
     *
     * Counterpart to Solidity's `int8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits.
     *
     * _Available since v3.1._
     */
    function toInt8(int256 value) internal pure returns (int8) {
        require(value >= -2**7 && value < 2**7, "SafeCast: value doesn\'t fit in 8 bits");
        return int8(value);
    }

    /**
     * @dev Converts an unsigned uint256 into a signed int256.
     *
     * Requirements:
     *
     * - input must be less than or equal to maxInt256.
     */
    function toInt256(uint256 value) internal pure returns (int256) {
        require(value < 2**255, "SafeCast: value doesn't fit in an int256");
        return int256(value);
    }
}

// Dependency file: @openzeppelin/contracts/math/SafeMath.sol



// pragma solidity ^0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// Dependency file: @openzeppelin/contracts/utils/ReentrancyGuard.sol



// pragma solidity ^0.6.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.


*/

pragma solidity ^0.6.10;
pragma experimental "ABIEncoderV2";

// import { ReentrancyGuard } from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
// import { SafeMath } from "@openzeppelin/contracts/math/SafeMath.sol";
// import { SafeCast } from "@openzeppelin/contracts/utils/SafeCast.sol";

// import { IController } from "../../interfaces/IController.sol";
// import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import { IExchangeAdapter } from "../../interfaces/IExchangeAdapter.sol";
// import { IIntegrationRegistry } from "../../interfaces/IIntegrationRegistry.sol";
// import { Invoke } from "../lib/Invoke.sol";
// import { ISetToken } from "../../interfaces/ISetToken.sol";
// import { ModuleBase } from "../lib/ModuleBase.sol";
// import { Position } from "../lib/Position.sol";
// import { PreciseUnitMath } from "../../lib/PreciseUnitMath.sol";

/**
 * @title TradeModule
 * @author Set Protocol
 *
 * Module that enables SetTokens to perform atomic trades using Decentralized Exchanges
 * such as 1inch or Kyber. Integrations mappings are stored on the IntegrationRegistry contract.
 */
contract TradeModule is ModuleBase, ReentrancyGuard {
    using SafeCast for int256;
    using SafeMath for uint256;

    using Invoke for ISetToken;
    using Position for ISetToken;
    using PreciseUnitMath for uint256;

    /* ============ Struct ============ */

    struct TradeInfo {
        ISetToken setToken;                             // Instance of SetToken
        IExchangeAdapter exchangeAdapter;               // Instance of exchange adapter contract
        address sendToken;                              // Address of token being sold
        address receiveToken;                           // Address of token being bought
        uint256 setTotalSupply;                         // Total supply of SetToken in Precise Units (10^18)
        uint256 totalSendQuantity;                      // Total quantity of sold token (position unit x total supply)
        uint256 totalMinReceiveQuantity;                // Total minimum quantity of token to receive back
        uint256 preTradeSendTokenBalance;               // Total initial balance of token being sold
        uint256 preTradeReceiveTokenBalance;            // Total initial balance of token being bought
    }

    /* ============ Events ============ */

    event ComponentExchanged(
        ISetToken indexed _setToken,
        address indexed _sendToken,
        address indexed _receiveToken,
        IExchangeAdapter _exchangeAdapter,
        uint256 _totalSendAmount,
        uint256 _totalReceiveAmount,
        uint256 _protocolFee
    );

    /* ============ Constants ============ */

    // 0 index stores the fee % charged in the trade function
    uint256 constant internal TRADE_MODULE_PROTOCOL_FEE_INDEX = 0;

    /* ============ Constructor ============ */

    constructor(IController _controller) public ModuleBase(_controller) {}

    /* ============ External Functions ============ */

    /**
     * Initializes this module to the SetToken. Only callable by the SetToken's manager.
     *
     * @param _setToken                 Instance of the SetToken to initialize
     */
    function initialize(
        ISetToken _setToken
    )
        external
        onlyValidAndPendingSet(_setToken)
        onlySetManager(_setToken, msg.sender)
    {
        _setToken.initializeModule();
    }

    /**
     * Executes a trade on a supported DEX. Only callable by the SetToken's manager.
     * @dev Although the SetToken units are passed in for the send and receive quantities, the total quantity
     * sent and received is the quantity of SetToken units multiplied by the SetToken totalSupply.
     *
     * @param _setToken             Instance of the SetToken to trade
     * @param _exchangeName         Human readable name of the exchange in the integrations registry
     * @param _sendToken            Address of the token to be sent to the exchange
     * @param _sendQuantity         Units of token in SetToken sent to the exchange
     * @param _receiveToken         Address of the token that will be received from the exchange
     * @param _minReceiveQuantity   Min units of token in SetToken to be received from the exchange
     * @param _data                 Arbitrary bytes to be used to construct trade call data
     */
    function trade(
        ISetToken _setToken,
        string memory _exchangeName,
        address _sendToken,
        uint256 _sendQuantity,
        address _receiveToken,
        uint256 _minReceiveQuantity,
        bytes memory _data
    )
        external
        nonReentrant
        onlyManagerAndValidSet(_setToken)
    {
        TradeInfo memory tradeInfo = _createTradeInfo(
            _setToken,
            _exchangeName,
            _sendToken,
            _receiveToken,
            _sendQuantity,
            _minReceiveQuantity
        );

        _validatePreTradeData(tradeInfo, _sendQuantity);

        _executeTrade(tradeInfo, _data);

        uint256 exchangedQuantity = _validatePostTrade(tradeInfo);

        uint256 protocolFee = _accrueProtocolFee(tradeInfo, exchangedQuantity);

        (
            uint256 netSendAmount,
            uint256 netReceiveAmount
        ) = _updateSetTokenPositions(tradeInfo);

        emit ComponentExchanged(
            _setToken,
            _sendToken,
            _receiveToken,
            tradeInfo.exchangeAdapter,
            netSendAmount,
            netReceiveAmount,
            protocolFee
        );
    }

    /**
     * Removes this module from the SetToken, via call by the SetToken. Left with empty logic
     * here because there are no check needed to verify removal.
     */
    function removeModule() external override {}

    /* ============ Internal Functions ============ */

    /**
     * Create and return TradeInfo struct
     *
     * @param _setToken             Instance of the SetToken to trade
     * @param _exchangeName         Human readable name of the exchange in the integrations registry
     * @param _sendToken            Address of the token to be sent to the exchange
     * @param _receiveToken         Address of the token that will be received from the exchange
     * @param _sendQuantity         Units of token in SetToken sent to the exchange
     * @param _minReceiveQuantity   Min units of token in SetToken to be received from the exchange
     *
     * return TradeInfo             Struct containing data for trade
     */
    function _createTradeInfo(
        ISetToken _setToken,
        string memory _exchangeName,
        address _sendToken,
        address _receiveToken,
        uint256 _sendQuantity,
        uint256 _minReceiveQuantity
    )
        internal
        view
        returns (TradeInfo memory)
    {
        TradeInfo memory tradeInfo;

        tradeInfo.setToken = _setToken;

        tradeInfo.exchangeAdapter = IExchangeAdapter(getAndValidateAdapter(_exchangeName));

        tradeInfo.sendToken = _sendToken;
        tradeInfo.receiveToken = _receiveToken;

        tradeInfo.setTotalSupply = _setToken.totalSupply();

        tradeInfo.totalSendQuantity = Position.getDefaultTotalNotional(tradeInfo.setTotalSupply, _sendQuantity);

        tradeInfo.totalMinReceiveQuantity = Position.getDefaultTotalNotional(tradeInfo.setTotalSupply, _minReceiveQuantity);

        tradeInfo.preTradeSendTokenBalance = IERC20(_sendToken).balanceOf(address(_setToken));
        tradeInfo.preTradeReceiveTokenBalance = IERC20(_receiveToken).balanceOf(address(_setToken));

        return tradeInfo;
    }

    /**
     * Validate pre trade data. Check exchange is valid, token quantity is valid.
     *
     * @param _tradeInfo            Struct containing trade information used in internal functions
     * @param _sendQuantity         Units of token in SetToken sent to the exchange
     */
    function _validatePreTradeData(TradeInfo memory _tradeInfo, uint256 _sendQuantity) internal view {
        require(_tradeInfo.totalSendQuantity > 0, "Token to sell must be nonzero");

        require(
            _tradeInfo.setToken.hasSufficientDefaultUnits(_tradeInfo.sendToken, _sendQuantity),
            "Unit cant be greater than existing"
        );
    }

    /**
     * Invoke approve for send token, get method data and invoke trade in the context of the SetToken.
     *
     * @param _tradeInfo            Struct containing trade information used in internal functions
     * @param _data                 Arbitrary bytes to be used to construct trade call data
     */
    function _executeTrade(
        TradeInfo memory _tradeInfo,
        bytes memory _data
    )
        internal
    {
        // Get spender address from exchange adapter and invoke approve for exact amount on SetToken
        _tradeInfo.setToken.invokeApprove(
            _tradeInfo.sendToken,
            _tradeInfo.exchangeAdapter.getSpender(),
            _tradeInfo.totalSendQuantity
        );

        (
            address targetExchange,
            uint256 callValue,
            bytes memory methodData
        ) = _tradeInfo.exchangeAdapter.getTradeCalldata(
            _tradeInfo.sendToken,
            _tradeInfo.receiveToken,
            address(_tradeInfo.setToken),
            _tradeInfo.totalSendQuantity,
            _tradeInfo.totalMinReceiveQuantity,
            _data
        );

        _tradeInfo.setToken.invoke(targetExchange, callValue, methodData);
    }

    /**
     * Validate post trade data.
     *
     * @param _tradeInfo                Struct containing trade information used in internal functions
     * @return uint256                  Total quantity of receive token that was exchanged
     */
    function _validatePostTrade(TradeInfo memory _tradeInfo) internal view returns (uint256) {
        uint256 exchangedQuantity = IERC20(_tradeInfo.receiveToken)
            .balanceOf(address(_tradeInfo.setToken))
            .sub(_tradeInfo.preTradeReceiveTokenBalance);

        require(
            exchangedQuantity >= _tradeInfo.totalMinReceiveQuantity,
            "Slippage greater than allowed"
        );

        return exchangedQuantity;
    }

    /**
     * Retrieve fee from controller and calculate total protocol fee and send from SetToken to protocol recipient
     *
     * @param _tradeInfo                Struct containing trade information used in internal functions
     * @return uint256                  Amount of receive token taken as protocol fee
     */
    function _accrueProtocolFee(TradeInfo memory _tradeInfo, uint256 _exchangedQuantity) internal returns (uint256) {
        uint256 protocolFeeTotal = getModuleFee(TRADE_MODULE_PROTOCOL_FEE_INDEX, _exchangedQuantity);
        
        payProtocolFeeFromSetToken(_tradeInfo.setToken, _tradeInfo.receiveToken, protocolFeeTotal);
        
        return protocolFeeTotal;
    }

    /**
     * Update SetToken positions
     *
     * @param _tradeInfo                Struct containing trade information used in internal functions
     * @return uint256                  Amount of sendTokens used in the trade
     * @return uint256                  Amount of receiveTokens received in the trade (net of fees)
     */
    function _updateSetTokenPositions(TradeInfo memory _tradeInfo) internal returns (uint256, uint256) {
        (uint256 currentSendTokenBalance,,) = _tradeInfo.setToken.calculateAndEditDefaultPosition(
            _tradeInfo.sendToken,
            _tradeInfo.setTotalSupply,
            _tradeInfo.preTradeSendTokenBalance
        );

        (uint256 currentReceiveTokenBalance,,) = _tradeInfo.setToken.calculateAndEditDefaultPosition(
            _tradeInfo.receiveToken,
            _tradeInfo.setTotalSupply,
            _tradeInfo.preTradeReceiveTokenBalance
        );

        return (
            _tradeInfo.preTradeSendTokenBalance.sub(currentSendTokenBalance),
            currentReceiveTokenBalance.sub(_tradeInfo.preTradeReceiveTokenBalance)
        );
    }
}

Contract ABI

[{"inputs":[{"internalType":"contract IController","name":"_controller","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract ISetToken","name":"_setToken","type":"address"},{"indexed":true,"internalType":"address","name":"_sendToken","type":"address"},{"indexed":true,"internalType":"address","name":"_receiveToken","type":"address"},{"indexed":false,"internalType":"contract IExchangeAdapter","name":"_exchangeAdapter","type":"address"},{"indexed":false,"internalType":"uint256","name":"_totalSendAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_totalReceiveAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_protocolFee","type":"uint256"}],"name":"ComponentExchanged","type":"event"},{"inputs":[],"name":"controller","outputs":[{"internalType":"contract IController","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract ISetToken","name":"_setToken","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"removeModule","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract ISetToken","name":"_setToken","type":"address"},{"internalType":"string","name":"_exchangeName","type":"string"},{"internalType":"address","name":"_sendToken","type":"address"},{"internalType":"uint256","name":"_sendQuantity","type":"uint256"},{"internalType":"address","name":"_receiveToken","type":"address"},{"internalType":"uint256","name":"_minReceiveQuantity","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"trade","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000009048278ca7e874f9338e4898c436ab07aa454701

-----Decoded View---------------
Arg [0] : _controller (address): 0x9048278ca7e874f9338e4898c436ab07aa454701

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000009048278ca7e874f9338e4898c436ab07aa454701


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://2dff53a3fe9e5d6608a59fe70fb71dc221b3557c08a8245187fd190253776a00
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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