Contract Source Code (Solidity)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

Outline

•  contract DSProxyCache *
•    - function read(bytes _code)
•    - function write(bytes _code)

More Options

• Similar
• Sol2Uml
• Submit Audit
• Compare

/**
 *Submitted for verification at Etherscan.io on 2018-06-22
*/

// proxy.sol - execute actions atomically through the proxy's identity

// Copyright (C) 2017  DappHub, LLC

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity ^0.4.23;

// DSProxyCache
// This global cache stores addresses of contracts previously deployed
// by a proxy. This saves gas from repeat deployment of the same
// contracts and eliminates blockchain bloat.

// By default, all proxies deployed from the same factory store
// contracts in the same cache. The cache a proxy instance uses can be
// changed.  The cache uses the sha3 hash of a contract's bytecode to
// lookup the address
contract DSProxyCache {
    mapping(bytes32 => address) cache;

    function read(bytes _code) public view returns (address) {
        bytes32 hash = keccak256(_code);
        return cache[hash];
    }

    function write(bytes _code) public returns (address target) {
        assembly {
            target := create(0, add(_code, 0x20), mload(_code))
            switch iszero(extcodesize(target))
            case 1 {
                // throw if contract failed to deploy
                revert(0, 0)
            }
        }
        bytes32 hash = keccak256(_code);
        cache[hash] = target;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"constant":false,"inputs":[{"name":"_code","type":"bytes"}],"name":"write","outputs":[{"name":"target","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_code","type":"bytes"}],"name":"read","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"}]

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

bzzr://105083b62f0f9cd6be84fcbd3c7208d0d48d7235d9538890eac2369f4864414d