mfahampshire
1647c368fb
* pragma bump to 0.8.10 * updated gravity bridge contracts * moved modified contracts to new 'test' dir for unit test clarity
35 lines
1.1 KiB
Solidity
35 lines
1.1 KiB
Solidity
//SPDX-License-Identifier: Apache-2.0
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pragma solidity 0.8.10;
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import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
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contract CosmosERC20 is ERC20 {
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uint256 MAX_UINT = 2**256 - 1;
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uint8 private cosmosDecimals;
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address private gravityAddress;
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// This override ensures we return the proper number of decimals
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// for the cosmos token
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function decimals() public view virtual override returns (uint8) {
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return cosmosDecimals;
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}
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// This is not an accurate total supply. Instead this is the total supply
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// of the given cosmos asset on Ethereum at this moment in time. Keeping
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// a totally accurate supply would require constant updates from the Cosmos
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// side, while in theory this could be piggy-backed on some existing bridge
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// operation it's a lot of complextiy to add so we chose to forgoe it.
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function totalSupply() public view virtual override returns (uint256) {
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return MAX_UINT - balanceOf(gravityAddress);
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}
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constructor(
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address _gravityAddress,
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string memory _name,
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string memory _symbol,
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uint8 _decimals
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) ERC20(_name, _symbol) {
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cosmosDecimals = _decimals;
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gravityAddress = _gravityAddress;
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_mint(_gravityAddress, MAX_UINT);
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}
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} |