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Cancel | 7120426 | 1880 days ago | IN | 0 ETH | 0.00017937 | ||||
Cancel | 7120424 | 1880 days ago | IN | 0 ETH | 0.00018577 | ||||
Cancel | 7120422 | 1880 days ago | IN | 0 ETH | 0.00018587 | ||||
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Cancel | 7120417 | 1880 days ago | IN | 0 ETH | 0.00018587 | ||||
Cancel | 7120417 | 1880 days ago | IN | 0 ETH | 0.00018587 | ||||
Cancel | 7120415 | 1880 days ago | IN | 0 ETH | 0.00017947 | ||||
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Cancel | 7120415 | 1880 days ago | IN | 0 ETH | 0.00020837 | ||||
Cancel | 7120413 | 1880 days ago | IN | 0 ETH | 0.00018587 | ||||
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Cancel | 7120405 | 1880 days ago | IN | 0 ETH | 0.00018469 | ||||
Cancel | 7120405 | 1880 days ago | IN | 0 ETH | 0.00018469 | ||||
Cancel | 7120405 | 1880 days ago | IN | 0 ETH | 0.00018469 |
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Contract Name:
MatchingMarket
Compiler Version
v0.4.19+commit.c4cbbb05
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2017-12-18 */ pragma solidity ^0.4.18; contract DSAuthority { function canCall( address src, address dst, bytes4 sig ) public view returns (bool); } contract DSAuthEvents { event LogSetAuthority (address indexed authority); event LogSetOwner (address indexed owner); } contract DSAuth is DSAuthEvents { DSAuthority public authority; address public owner; function DSAuth() public { owner = msg.sender; LogSetOwner(msg.sender); } function setOwner(address owner_) public auth { owner = owner_; LogSetOwner(owner); } function setAuthority(DSAuthority authority_) public auth { authority = authority_; LogSetAuthority(authority); } modifier auth { require(isAuthorized(msg.sender, msg.sig)); _; } function isAuthorized(address src, bytes4 sig) internal view returns (bool) { if (src == address(this)) { return true; } else if (src == owner) { return true; } else if (authority == DSAuthority(0)) { return false; } else { return authority.canCall(src, this, sig); } } } contract DSMath { function add(uint x, uint y) internal pure returns (uint z) { require((z = x + y) >= x); } function sub(uint x, uint y) internal pure returns (uint z) { require((z = x - y) <= x); } function mul(uint x, uint y) internal pure returns (uint z) { require(y == 0 || (z = x * y) / y == x); } function min(uint x, uint y) internal pure returns (uint z) { return x <= y ? x : y; } function max(uint x, uint y) internal pure returns (uint z) { return x >= y ? x : y; } function imin(int x, int y) internal pure returns (int z) { return x <= y ? x : y; } function imax(int x, int y) internal pure returns (int z) { return x >= y ? x : y; } uint constant WAD = 10 ** 18; uint constant RAY = 10 ** 27; function wmul(uint x, uint y) internal pure returns (uint z) { z = add(mul(x, y), WAD / 2) / WAD; } function rmul(uint x, uint y) internal pure returns (uint z) { z = add(mul(x, y), RAY / 2) / RAY; } function wdiv(uint x, uint y) internal pure returns (uint z) { z = add(mul(x, WAD), y / 2) / y; } function rdiv(uint x, uint y) internal pure returns (uint z) { z = add(mul(x, RAY), y / 2) / y; } // This famous algorithm is called "exponentiation by squaring" // and calculates x^n with x as fixed-point and n as regular unsigned. // // It's O(log n), instead of O(n) for naive repeated multiplication. // // These facts are why it works: // // If n is even, then x^n = (x^2)^(n/2). // If n is odd, then x^n = x * x^(n-1), // and applying the equation for even x gives // x^n = x * (x^2)^((n-1) / 2). // // Also, EVM division is flooring and // floor[(n-1) / 2] = floor[n / 2]. // function rpow(uint x, uint n) internal pure returns (uint z) { z = n % 2 != 0 ? x : RAY; for (n /= 2; n != 0; n /= 2) { x = rmul(x, x); if (n % 2 != 0) { z = rmul(z, x); } } } } contract ERC20Events { event Approval(address indexed src, address indexed guy, uint wad); event Transfer(address indexed src, address indexed dst, uint wad); } contract ERC20 is ERC20Events { function totalSupply() public view returns (uint); function balanceOf(address guy) public view returns (uint); function allowance(address src, address guy) public view returns (uint); function approve(address guy, uint wad) public returns (bool); function transfer(address dst, uint wad) public returns (bool); function transferFrom( address src, address dst, uint wad ) public returns (bool); } contract EventfulMarket { event LogItemUpdate(uint id); event LogTrade(uint pay_amt, address indexed pay_gem, uint buy_amt, address indexed buy_gem); event LogMake( bytes32 indexed id, bytes32 indexed pair, address indexed maker, ERC20 pay_gem, ERC20 buy_gem, uint128 pay_amt, uint128 buy_amt, uint64 timestamp ); event LogBump( bytes32 indexed id, bytes32 indexed pair, address indexed maker, ERC20 pay_gem, ERC20 buy_gem, uint128 pay_amt, uint128 buy_amt, uint64 timestamp ); event LogTake( bytes32 id, bytes32 indexed pair, address indexed maker, ERC20 pay_gem, ERC20 buy_gem, address indexed taker, uint128 take_amt, uint128 give_amt, uint64 timestamp ); event LogKill( bytes32 indexed id, bytes32 indexed pair, address indexed maker, ERC20 pay_gem, ERC20 buy_gem, uint128 pay_amt, uint128 buy_amt, uint64 timestamp ); } contract SimpleMarket is EventfulMarket, DSMath { uint public last_offer_id; mapping (uint => OfferInfo) public offers; bool locked; struct OfferInfo { uint pay_amt; ERC20 pay_gem; uint buy_amt; ERC20 buy_gem; address owner; uint64 timestamp; } modifier can_buy(uint id) { require(isActive(id)); _; } modifier can_cancel(uint id) { require(isActive(id)); require(getOwner(id) == msg.sender); _; } modifier can_offer { _; } modifier synchronized { require(!locked); locked = true; _; locked = false; } function isActive(uint id) public constant returns (bool active) { return offers[id].timestamp > 0; } function getOwner(uint id) public constant returns (address owner) { return offers[id].owner; } function getOffer(uint id) public constant returns (uint, ERC20, uint, ERC20) { var offer = offers[id]; return (offer.pay_amt, offer.pay_gem, offer.buy_amt, offer.buy_gem); } // ---- Public entrypoints ---- // function bump(bytes32 id_) public can_buy(uint256(id_)) { var id = uint256(id_); LogBump( id_, keccak256(offers[id].pay_gem, offers[id].buy_gem), offers[id].owner, offers[id].pay_gem, offers[id].buy_gem, uint128(offers[id].pay_amt), uint128(offers[id].buy_amt), offers[id].timestamp ); } // Accept given `quantity` of an offer. Transfers funds from caller to // offer maker, and from market to caller. function buy(uint id, uint quantity) public can_buy(id) synchronized returns (bool) { OfferInfo memory offer = offers[id]; uint spend = mul(quantity, offer.buy_amt) / offer.pay_amt; require(uint128(spend) == spend); require(uint128(quantity) == quantity); // For backwards semantic compatibility. if (quantity == 0 || spend == 0 || quantity > offer.pay_amt || spend > offer.buy_amt) { return false; } offers[id].pay_amt = sub(offer.pay_amt, quantity); offers[id].buy_amt = sub(offer.buy_amt, spend); require( offer.buy_gem.transferFrom(msg.sender, offer.owner, spend) ); require( offer.pay_gem.transfer(msg.sender, quantity) ); LogItemUpdate(id); LogTake( bytes32(id), keccak256(offer.pay_gem, offer.buy_gem), offer.owner, offer.pay_gem, offer.buy_gem, msg.sender, uint128(quantity), uint128(spend), uint64(now) ); LogTrade(quantity, offer.pay_gem, spend, offer.buy_gem); if (offers[id].pay_amt == 0) { delete offers[id]; } return true; } // Cancel an offer. Refunds offer maker. function cancel(uint id) public can_cancel(id) synchronized returns (bool success) { // read-only offer. Modify an offer by directly accessing offers[id] OfferInfo memory offer = offers[id]; delete offers[id]; require( offer.pay_gem.transfer(offer.owner, offer.pay_amt) ); LogItemUpdate(id); LogKill( bytes32(id), keccak256(offer.pay_gem, offer.buy_gem), offer.owner, offer.pay_gem, offer.buy_gem, uint128(offer.pay_amt), uint128(offer.buy_amt), uint64(now) ); success = true; } function kill(bytes32 id) public { require(cancel(uint256(id))); } function make( ERC20 pay_gem, ERC20 buy_gem, uint128 pay_amt, uint128 buy_amt ) public returns (bytes32 id) { return bytes32(offer(pay_amt, pay_gem, buy_amt, buy_gem)); } // Make a new offer. Takes funds from the caller into market escrow. function offer(uint pay_amt, ERC20 pay_gem, uint buy_amt, ERC20 buy_gem) public can_offer synchronized returns (uint id) { require(uint128(pay_amt) == pay_amt); require(uint128(buy_amt) == buy_amt); require(pay_amt > 0); require(pay_gem != ERC20(0x0)); require(buy_amt > 0); require(buy_gem != ERC20(0x0)); require(pay_gem != buy_gem); OfferInfo memory info; info.pay_amt = pay_amt; info.pay_gem = pay_gem; info.buy_amt = buy_amt; info.buy_gem = buy_gem; info.owner = msg.sender; info.timestamp = uint64(now); id = _next_id(); offers[id] = info; require( pay_gem.transferFrom(msg.sender, this, pay_amt) ); LogItemUpdate(id); LogMake( bytes32(id), keccak256(pay_gem, buy_gem), msg.sender, pay_gem, buy_gem, uint128(pay_amt), uint128(buy_amt), uint64(now) ); } function take(bytes32 id, uint128 maxTakeAmount) public { require(buy(uint256(id), maxTakeAmount)); } function _next_id() internal returns (uint) { last_offer_id++; return last_offer_id; } } // Simple Market with a market lifetime. When the close_time has been reached, // offers can only be cancelled (offer and buy will throw). contract ExpiringMarket is DSAuth, SimpleMarket { uint64 public close_time; bool public stopped; // after close_time has been reached, no new offers are allowed modifier can_offer { require(!isClosed()); _; } // after close, no new buys are allowed modifier can_buy(uint id) { require(isActive(id)); require(!isClosed()); _; } // after close, anyone can cancel an offer modifier can_cancel(uint id) { require(isActive(id)); require(isClosed() || (msg.sender == getOwner(id))); _; } function ExpiringMarket(uint64 _close_time) public { close_time = _close_time; } function isClosed() public constant returns (bool closed) { return stopped || getTime() > close_time; } function getTime() public constant returns (uint64) { return uint64(now); } function stop() public auth { stopped = true; } } contract DSNote { event LogNote( bytes4 indexed sig, address indexed guy, bytes32 indexed foo, bytes32 indexed bar, uint wad, bytes fax ) anonymous; modifier note { bytes32 foo; bytes32 bar; assembly { foo := calldataload(4) bar := calldataload(36) } LogNote(msg.sig, msg.sender, foo, bar, msg.value, msg.data); _; } } contract MatchingEvents { event LogBuyEnabled(bool isEnabled); event LogMinSell(address pay_gem, uint min_amount); event LogMatchingEnabled(bool isEnabled); event LogUnsortedOffer(uint id); event LogSortedOffer(uint id); event LogAddTokenPairWhitelist(ERC20 baseToken, ERC20 quoteToken); event LogRemTokenPairWhitelist(ERC20 baseToken, ERC20 quoteToken); event LogInsert(address keeper, uint id); event LogDelete(address keeper, uint id); } contract MatchingMarket is MatchingEvents, ExpiringMarket, DSNote { bool public buyEnabled = true; //buy enabled bool public matchingEnabled = true; //true: enable matching, //false: revert to expiring market struct sortInfo { uint next; //points to id of next higher offer uint prev; //points to id of previous lower offer uint delb; //the blocknumber where this entry was marked for delete } mapping(uint => sortInfo) public _rank; //doubly linked lists of sorted offer ids mapping(address => mapping(address => uint)) public _best; //id of the highest offer for a token pair mapping(address => mapping(address => uint)) public _span; //number of offers stored for token pair in sorted orderbook mapping(address => uint) public _dust; //minimum sell amount for a token to avoid dust offers mapping(uint => uint) public _near; //next unsorted offer id mapping(bytes32 => bool) public _menu; //whitelist tracking which token pairs can be traded uint _head; //first unsorted offer id //check if token pair is enabled modifier isWhitelist(ERC20 buy_gem, ERC20 pay_gem) { require(_menu[keccak256(buy_gem, pay_gem)] || _menu[keccak256(pay_gem, buy_gem)]); _; } function MatchingMarket(uint64 close_time) ExpiringMarket(close_time) public { } // ---- Public entrypoints ---- // function make( ERC20 pay_gem, ERC20 buy_gem, uint128 pay_amt, uint128 buy_amt ) public returns (bytes32) { return bytes32(offer(pay_amt, pay_gem, buy_amt, buy_gem)); } function take(bytes32 id, uint128 maxTakeAmount) public { require(buy(uint256(id), maxTakeAmount)); } function kill(bytes32 id) public { require(cancel(uint256(id))); } // Make a new offer. Takes funds from the caller into market escrow. // // If matching is enabled: // * creates new offer without putting it in // the sorted list. // * available to authorized contracts only! // * keepers should call insert(id,pos) // to put offer in the sorted list. // // If matching is disabled: // * calls expiring market's offer(). // * available to everyone without authorization. // * no sorting is done. // function offer( uint pay_amt, //maker (ask) sell how much ERC20 pay_gem, //maker (ask) sell which token uint buy_amt, //taker (ask) buy how much ERC20 buy_gem //taker (ask) buy which token ) public isWhitelist(pay_gem, buy_gem) /* NOT synchronized!!! */ returns (uint) { var fn = matchingEnabled ? _offeru : super.offer; return fn(pay_amt, pay_gem, buy_amt, buy_gem); } // Make a new offer. Takes funds from the caller into market escrow. function offer( uint pay_amt, //maker (ask) sell how much ERC20 pay_gem, //maker (ask) sell which token uint buy_amt, //maker (ask) buy how much ERC20 buy_gem, //maker (ask) buy which token uint pos //position to insert offer, 0 should be used if unknown ) public isWhitelist(pay_gem, buy_gem) /*NOT synchronized!!! */ can_offer returns (uint) { return offer(pay_amt, pay_gem, buy_amt, buy_gem, pos, false); } function offer( uint pay_amt, //maker (ask) sell how much ERC20 pay_gem, //maker (ask) sell which token uint buy_amt, //maker (ask) buy how much ERC20 buy_gem, //maker (ask) buy which token uint pos, //position to insert offer, 0 should be used if unknown bool rounding //match "close enough" orders? ) public isWhitelist(pay_gem, buy_gem) /*NOT synchronized!!! */ can_offer returns (uint) { require(_dust[pay_gem] <= pay_amt); if (matchingEnabled) { return _matcho(pay_amt, pay_gem, buy_amt, buy_gem, pos, rounding); } return super.offer(pay_amt, pay_gem, buy_amt, buy_gem); } //Transfers funds from caller to offer maker, and from market to caller. function buy(uint id, uint amount) public /*NOT synchronized!!! */ can_buy(id) returns (bool) { var fn = matchingEnabled ? _buys : super.buy; return fn(id, amount); } // Cancel an offer. Refunds offer maker. function cancel(uint id) public /*NOT synchronized!!! */ can_cancel(id) returns (bool success) { if (matchingEnabled) { if (isOfferSorted(id)) { require(_unsort(id)); } else { require(_hide(id)); } } return super.cancel(id); //delete the offer. } //insert offer into the sorted list //keepers need to use this function function insert( uint id, //maker (ask) id uint pos //position to insert into ) public returns (bool) { require(!isOfferSorted(id)); //make sure offers[id] is not yet sorted require(isActive(id)); //make sure offers[id] is active _hide(id); //remove offer from unsorted offers list _sort(id, pos); //put offer into the sorted offers list LogInsert(msg.sender, id); return true; } //deletes _rank [id] // Function should be called by keepers. function del_rank(uint id) public returns (bool) { require(!isActive(id) && _rank[id].delb != 0 && _rank[id].delb < block.number - 10); delete _rank[id]; LogDelete(msg.sender, id); return true; } //returns true if token is succesfully added to whitelist // Function is used to add a token pair to the whitelist // All incoming offers are checked against the whitelist. function addTokenPairWhitelist( ERC20 baseToken, ERC20 quoteToken ) public auth note returns (bool) { require(!isTokenPairWhitelisted(baseToken, quoteToken)); require(address(baseToken) != 0x0 && address(quoteToken) != 0x0); _menu[keccak256(baseToken, quoteToken)] = true; LogAddTokenPairWhitelist(baseToken, quoteToken); return true; } //returns true if token is successfully removed from whitelist // Function is used to remove a token pair from the whitelist. // All incoming offers are checked against the whitelist. function remTokenPairWhitelist( ERC20 baseToken, ERC20 quoteToken ) public auth note returns (bool) { require(isTokenPairWhitelisted(baseToken, quoteToken)); delete _menu[keccak256(baseToken, quoteToken)]; delete _menu[keccak256(quoteToken, baseToken)]; LogRemTokenPairWhitelist(baseToken, quoteToken); return true; } function isTokenPairWhitelisted( ERC20 baseToken, ERC20 quoteToken ) public constant returns (bool) { return (_menu[keccak256(baseToken, quoteToken)] || _menu[keccak256(quoteToken, baseToken)]); } //set the minimum sell amount for a token // Function is used to avoid "dust offers" that have // very small amount of tokens to sell, and it would // cost more gas to accept the offer, than the value // of tokens received. function setMinSell( ERC20 pay_gem, //token to assign minimum sell amount to uint dust //maker (ask) minimum sell amount ) public auth note returns (bool) { _dust[pay_gem] = dust; LogMinSell(pay_gem, dust); return true; } //returns the minimum sell amount for an offer function getMinSell( ERC20 pay_gem //token for which minimum sell amount is queried ) public constant returns (uint) { return _dust[pay_gem]; } //set buy functionality enabled/disabled function setBuyEnabled(bool buyEnabled_) public auth returns (bool) { buyEnabled = buyEnabled_; LogBuyEnabled(buyEnabled); return true; } //set matching enabled/disabled // If matchingEnabled true(default), then inserted offers are matched. // Except the ones inserted by contracts, because those end up // in the unsorted list of offers, that must be later sorted by // keepers using insert(). // If matchingEnabled is false then MatchingMarket is reverted to ExpiringMarket, // and matching is not done, and sorted lists are disabled. function setMatchingEnabled(bool matchingEnabled_) public auth returns (bool) { matchingEnabled = matchingEnabled_; LogMatchingEnabled(matchingEnabled); return true; } //return the best offer for a token pair // the best offer is the lowest one if it's an ask, // and highest one if it's a bid offer function getBestOffer(ERC20 sell_gem, ERC20 buy_gem) public constant returns(uint) { return _best[sell_gem][buy_gem]; } //return the next worse offer in the sorted list // the worse offer is the higher one if its an ask, // a lower one if its a bid offer, // and in both cases the newer one if they're equal. function getWorseOffer(uint id) public constant returns(uint) { return _rank[id].prev; } //return the next better offer in the sorted list // the better offer is in the lower priced one if its an ask, // the next higher priced one if its a bid offer // and in both cases the older one if they're equal. function getBetterOffer(uint id) public constant returns(uint) { return _rank[id].next; } //return the amount of better offers for a token pair function getOfferCount(ERC20 sell_gem, ERC20 buy_gem) public constant returns(uint) { return _span[sell_gem][buy_gem]; } //get the first unsorted offer that was inserted by a contract // Contracts can't calculate the insertion position of their offer because it is not an O(1) operation. // Their offers get put in the unsorted list of offers. // Keepers can calculate the insertion position offchain and pass it to the insert() function to insert // the unsorted offer into the sorted list. Unsorted offers will not be matched, but can be bought with buy(). function getFirstUnsortedOffer() public constant returns(uint) { return _head; } //get the next unsorted offer // Can be used to cycle through all the unsorted offers. function getNextUnsortedOffer(uint id) public constant returns(uint) { return _near[id]; } function isOfferSorted(uint id) public constant returns(bool) { return _rank[id].next != 0 || _rank[id].prev != 0 || _best[offers[id].pay_gem][offers[id].buy_gem] == id; } function sellAllAmount(ERC20 pay_gem, uint pay_amt, ERC20 buy_gem, uint min_fill_amount) public returns (uint fill_amt) { uint offerId; while (pay_amt > 0) { //while there is amount to sell offerId = getBestOffer(buy_gem, pay_gem); //Get the best offer for the token pair require(offerId != 0); //Fails if there are not more offers // There is a chance that pay_amt is smaller than 1 wei of the other token if (pay_amt * 1 ether < wdiv(offers[offerId].buy_amt, offers[offerId].pay_amt)) { break; //We consider that all amount is sold } if (pay_amt >= offers[offerId].buy_amt) { //If amount to sell is higher or equal than current offer amount to buy fill_amt = add(fill_amt, offers[offerId].pay_amt); //Add amount bought to acumulator pay_amt = sub(pay_amt, offers[offerId].buy_amt); //Decrease amount to sell take(bytes32(offerId), uint128(offers[offerId].pay_amt)); //We take the whole offer } else { // if lower var baux = rmul(pay_amt * 10 ** 9, rdiv(offers[offerId].pay_amt, offers[offerId].buy_amt)) / 10 ** 9; fill_amt = add(fill_amt, baux); //Add amount bought to acumulator take(bytes32(offerId), uint128(baux)); //We take the portion of the offer that we need pay_amt = 0; //All amount is sold } } require(fill_amt >= min_fill_amount); } function buyAllAmount(ERC20 buy_gem, uint buy_amt, ERC20 pay_gem, uint max_fill_amount) public returns (uint fill_amt) { uint offerId; while (buy_amt > 0) { //Meanwhile there is amount to buy offerId = getBestOffer(buy_gem, pay_gem); //Get the best offer for the token pair require(offerId != 0); // There is a chance that buy_amt is smaller than 1 wei of the other token if (buy_amt * 1 ether < wdiv(offers[offerId].pay_amt, offers[offerId].buy_amt)) { break; //We consider that all amount is sold } if (buy_amt >= offers[offerId].pay_amt) { //If amount to buy is higher or equal than current offer amount to sell fill_amt = add(fill_amt, offers[offerId].buy_amt); //Add amount sold to acumulator buy_amt = sub(buy_amt, offers[offerId].pay_amt); //Decrease amount to buy take(bytes32(offerId), uint128(offers[offerId].pay_amt)); //We take the whole offer } else { //if lower fill_amt = add(fill_amt, rmul(buy_amt * 10 ** 9, rdiv(offers[offerId].buy_amt, offers[offerId].pay_amt)) / 10 ** 9); //Add amount sold to acumulator take(bytes32(offerId), uint128(buy_amt)); //We take the portion of the offer that we need buy_amt = 0; //All amount is bought } } require(fill_amt <= max_fill_amount); } function getBuyAmount(ERC20 buy_gem, ERC20 pay_gem, uint pay_amt) public constant returns (uint fill_amt) { var offerId = getBestOffer(buy_gem, pay_gem); //Get best offer for the token pair while (pay_amt > offers[offerId].buy_amt) { fill_amt = add(fill_amt, offers[offerId].pay_amt); //Add amount to buy accumulator pay_amt = sub(pay_amt, offers[offerId].buy_amt); //Decrease amount to pay if (pay_amt > 0) { //If we still need more offers offerId = getWorseOffer(offerId); //We look for the next best offer require(offerId != 0); //Fails if there are not enough offers to complete } } fill_amt = add(fill_amt, rmul(pay_amt * 10 ** 9, rdiv(offers[offerId].pay_amt, offers[offerId].buy_amt)) / 10 ** 9); //Add proportional amount of last offer to buy accumulator } function getPayAmount(ERC20 pay_gem, ERC20 buy_gem, uint buy_amt) public constant returns (uint fill_amt) { var offerId = getBestOffer(buy_gem, pay_gem); //Get best offer for the token pair while (buy_amt > offers[offerId].pay_amt) { fill_amt = add(fill_amt, offers[offerId].buy_amt); //Add amount to pay accumulator buy_amt = sub(buy_amt, offers[offerId].pay_amt); //Decrease amount to buy if (buy_amt > 0) { //If we still need more offers offerId = getWorseOffer(offerId); //We look for the next best offer require(offerId != 0); //Fails if there are not enough offers to complete } } fill_amt = add(fill_amt, rmul(buy_amt * 10 ** 9, rdiv(offers[offerId].buy_amt, offers[offerId].pay_amt)) / 10 ** 9); //Add proportional amount of last offer to pay accumulator } // ---- Internal Functions ---- // function _buys(uint id, uint amount) internal returns (bool) { require(buyEnabled); if (amount == offers[id].pay_amt && isOfferSorted(id)) { //offers[id] must be removed from sorted list because all of it is bought _unsort(id); } require(super.buy(id, amount)); return true; } //find the id of the next higher offer after offers[id] function _find(uint id) internal view returns (uint) { require( id > 0 ); address buy_gem = address(offers[id].buy_gem); address pay_gem = address(offers[id].pay_gem); uint top = _best[pay_gem][buy_gem]; uint old_top = 0; // Find the larger-than-id order whose successor is less-than-id. while (top != 0 && _isPricedLtOrEq(id, top)) { old_top = top; top = _rank[top].prev; } return old_top; } //find the id of the next higher offer after offers[id] function _findpos(uint id, uint pos) internal view returns (uint) { require(id > 0); // Look for an active order. while (pos != 0 && !isActive(pos)) { pos = _rank[pos].prev; } if (pos == 0) { //if we got to the end of list without a single active offer return _find(id); } else { // if we did find a nearby active offer // Walk the order book down from there... if(_isPricedLtOrEq(id, pos)) { uint old_pos; // Guaranteed to run at least once because of // the prior if statements. while (pos != 0 && _isPricedLtOrEq(id, pos)) { old_pos = pos; pos = _rank[pos].prev; } return old_pos; // ...or walk it up. } else { while (pos != 0 && !_isPricedLtOrEq(id, pos)) { pos = _rank[pos].next; } return pos; } } } //return true if offers[low] priced less than or equal to offers[high] function _isPricedLtOrEq( uint low, //lower priced offer's id uint high //higher priced offer's id ) internal view returns (bool) { return mul(offers[low].buy_amt, offers[high].pay_amt) >= mul(offers[high].buy_amt, offers[low].pay_amt); } //these variables are global only because of solidity local variable limit //match offers with taker offer, and execute token transactions function _matcho( uint t_pay_amt, //taker sell how much ERC20 t_pay_gem, //taker sell which token uint t_buy_amt, //taker buy how much ERC20 t_buy_gem, //taker buy which token uint pos, //position id bool rounding //match "close enough" orders? ) internal returns (uint id) { uint best_maker_id; //highest maker id uint t_buy_amt_old; //taker buy how much saved uint m_buy_amt; //maker offer wants to buy this much token uint m_pay_amt; //maker offer wants to sell this much token // there is at least one offer stored for token pair while (_best[t_buy_gem][t_pay_gem] > 0) { best_maker_id = _best[t_buy_gem][t_pay_gem]; m_buy_amt = offers[best_maker_id].buy_amt; m_pay_amt = offers[best_maker_id].pay_amt; // Ugly hack to work around rounding errors. Based on the idea that // the furthest the amounts can stray from their "true" values is 1. // Ergo the worst case has t_pay_amt and m_pay_amt at +1 away from // their "correct" values and m_buy_amt and t_buy_amt at -1. // Since (c - 1) * (d - 1) > (a + 1) * (b + 1) is equivalent to // c * d > a * b + a + b + c + d, we write... if (mul(m_buy_amt, t_buy_amt) > mul(t_pay_amt, m_pay_amt) + (rounding ? m_buy_amt + t_buy_amt + t_pay_amt + m_pay_amt : 0)) { break; } // ^ The `rounding` parameter is a compromise borne of a couple days // of discussion. buy(best_maker_id, min(m_pay_amt, t_buy_amt)); t_buy_amt_old = t_buy_amt; t_buy_amt = sub(t_buy_amt, min(m_pay_amt, t_buy_amt)); t_pay_amt = mul(t_buy_amt, t_pay_amt) / t_buy_amt_old; if (t_pay_amt == 0 || t_buy_amt == 0) { break; } } if (t_buy_amt > 0 && t_pay_amt > 0) { //new offer should be created id = super.offer(t_pay_amt, t_pay_gem, t_buy_amt, t_buy_gem); //insert offer into the sorted list _sort(id, pos); } } // Make a new offer without putting it in the sorted list. // Takes funds from the caller into market escrow. // ****Available to authorized contracts only!********** // Keepers should call insert(id,pos) to put offer in the sorted list. function _offeru( uint pay_amt, //maker (ask) sell how much ERC20 pay_gem, //maker (ask) sell which token uint buy_amt, //maker (ask) buy how much ERC20 buy_gem //maker (ask) buy which token ) internal /*NOT synchronized!!! */ returns (uint id) { require(_dust[pay_gem] <= pay_amt); id = super.offer(pay_amt, pay_gem, buy_amt, buy_gem); _near[id] = _head; _head = id; LogUnsortedOffer(id); } //put offer into the sorted list function _sort( uint id, //maker (ask) id uint pos //position to insert into ) internal { require(isActive(id)); address buy_gem = address(offers[id].buy_gem); address pay_gem = address(offers[id].pay_gem); uint prev_id; //maker (ask) id if (pos == 0 || !isOfferSorted(pos)) { pos = _find(id); } else { pos = _findpos(id, pos); //if user has entered a `pos` that belongs to another currency pair //we start from scratch if(pos != 0 && (offers[pos].pay_gem != offers[id].pay_gem || offers[pos].buy_gem != offers[id].buy_gem)) { pos = 0; pos=_find(id); } } //requirement below is satisfied by statements above //require(pos == 0 || isOfferSorted(pos)); if (pos != 0) { //offers[id] is not the highest offer //requirement below is satisfied by statements above //require(_isPricedLtOrEq(id, pos)); prev_id = _rank[pos].prev; _rank[pos].prev = id; _rank[id].next = pos; } else { //offers[id] is the highest offer prev_id = _best[pay_gem][buy_gem]; _best[pay_gem][buy_gem] = id; } if (prev_id != 0) { //if lower offer does exist //requirement below is satisfied by statements above //require(!_isPricedLtOrEq(id, prev_id)); _rank[prev_id].next = id; _rank[id].prev = prev_id; } _span[pay_gem][buy_gem]++; LogSortedOffer(id); } // Remove offer from the sorted list (does not cancel offer) function _unsort( uint id //id of maker (ask) offer to remove from sorted list ) internal returns (bool) { address buy_gem = address(offers[id].buy_gem); address pay_gem = address(offers[id].pay_gem); require(_span[pay_gem][buy_gem] > 0); require(_rank[id].delb == 0 && //assert id is in the sorted list isOfferSorted(id)); if (id != _best[pay_gem][buy_gem]) { // offers[id] is not the highest offer require(_rank[_rank[id].next].prev == id); _rank[_rank[id].next].prev = _rank[id].prev; } else { //offers[id] is the highest offer _best[pay_gem][buy_gem] = _rank[id].prev; } if (_rank[id].prev != 0) { //offers[id] is not the lowest offer require(_rank[_rank[id].prev].next == id); _rank[_rank[id].prev].next = _rank[id].next; } _span[pay_gem][buy_gem]--; _rank[id].delb = block.number; //mark _rank[id] for deletion return true; } //Hide offer from the unsorted order book (does not cancel offer) function _hide( uint id //id of maker offer to remove from unsorted list ) internal returns (bool) { uint uid = _head; //id of an offer in unsorted offers list uint pre = uid; //id of previous offer in unsorted offers list require(!isOfferSorted(id)); //make sure offer id is not in sorted offers list if (_head == id) { //check if offer is first offer in unsorted offers list _head = _near[id]; //set head to new first unsorted offer _near[id] = 0; //delete order from unsorted order list return true; } while (uid > 0 && uid != id) { //find offer in unsorted order list pre = uid; uid = _near[uid]; } if (uid != id) { //did not find offer id in unsorted offers list return false; } _near[pre] = _near[id]; //set previous unsorted offer to point to offer after offer id _near[id] = 0; //delete order from unsorted order list return true; } }
Contract Security Audit
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000000000000000000000000000000000005c18e140
-----Decoded View---------------
Arg [0] : close_time (uint64): 1545134400
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000000000000000000000000000000000005c18e140
Swarm Source
bzzr://95afc05b2e23665dee009f71c5171aa6e967666958dd65c039ad9fbf5c429412
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.