{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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"source": "// SPDX-License-Identifier: SEE LICENSE IN LICENSE\r\npragma solidity 0.6.12;\r\nimport \"./Utils.sol\";\r\nimport \"./SafeMath.sol\";\r\nimport \"./interfaces/IPriceOracle.sol\";\r\nimport \"./interfaces/IChainlinkPriceOracle.sol\";\r\n\r\n/**\r\n * @dev Provides the off-chain rate between two tokens\r\n *\r\n * The price oracle uses chainlink oracles internally to get the rates of the two tokens\r\n * with respect to a common denominator, and then returns the rate between them, which\r\n * is equivalent to the rate of TokenA / TokenB\r\n*/\r\ncontract PriceOracle is IPriceOracle, Utils {\r\n using SafeMath for uint256;\r\n\r\n IERC20Token private constant ETH_ADDRESS = IERC20Token(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);\r\n uint8 private constant ETH_DECIMALS = 18;\r\n\r\n IERC20Token public tokenA; // token A the oracle supports\r\n IERC20Token public tokenB; // token B the oracle supports\r\n mapping (IERC20Token => uint8) public tokenDecimals; // token -> token decimals\r\n\r\n IChainlinkPriceOracle public override tokenAOracle; // token A chainlink price oracle\r\n IChainlinkPriceOracle public override tokenBOracle; // token B chainlink price oracle\r\n mapping (IERC20Token => IChainlinkPriceOracle) public tokensToOracles; // token -> price oracle for easier access\r\n\r\n /**\r\n * @dev initializes a new PriceOracle instance\r\n * note that the oracles must have the same common denominator (USD, ETH etc.)\r\n *\r\n * @param _tokenA first token to support\r\n * @param _tokenB second token to support\r\n * @param _tokenAOracle first token price oracle\r\n * @param _tokenBOracle second token price oracle\r\n */\r\n constructor(IERC20Token _tokenA, IERC20Token _tokenB, IChainlinkPriceOracle _tokenAOracle, IChainlinkPriceOracle _tokenBOracle)\r\n public\r\n validUniqueAddresses(address(_tokenA), address(_tokenB))\r\n validUniqueAddresses(address(_tokenAOracle), address(_tokenBOracle))\r\n {\r\n tokenA = _tokenA;\r\n tokenB = _tokenB;\r\n tokenDecimals[_tokenA] = decimals(_tokenA);\r\n tokenDecimals[_tokenB] = decimals(_tokenB);\r\n\r\n tokenAOracle = _tokenAOracle;\r\n tokenBOracle = _tokenBOracle;\r\n tokensToOracles[_tokenA] = _tokenAOracle;\r\n tokensToOracles[_tokenB] = _tokenBOracle;\r\n }\r\n\r\n // ensures that the provided addresses are unique valid\r\n modifier validUniqueAddresses(address _address1, address _address2) {\r\n _validUniqueAddresses(_address1, _address2);\r\n _;\r\n }\r\n\r\n // error message binary size optimization\r\n function _validUniqueAddresses(address _address1, address _address2) internal pure {\r\n _validAddress(_address1);\r\n _validAddress(_address2);\r\n require(_address1 != _address2, \"ERR_SAME_ADDRESS\");\r\n }\r\n\r\n // ensures that the provides tokens are supported by the oracle\r\n modifier supportedTokens(IERC20Token _tokenA, IERC20Token _tokenB) {\r\n _supportedTokens(_tokenA, _tokenB);\r\n _;\r\n }\r\n\r\n // error message binary size optimization\r\n function _supportedTokens(IERC20Token _tokenA, IERC20Token _tokenB) internal view {\r\n _validUniqueAddresses(address(_tokenA), address(_tokenB));\r\n require(address(tokensToOracles[_tokenA]) != address(0) && address(tokensToOracles[_tokenB]) != address(0), \"ERR_UNSUPPORTED_TOKEN\");\r\n }\r\n\r\n /**\r\n * @dev returns the latest known rate between the two given tokens\r\n * for a given pair of tokens A and B, returns the rate of A / B\r\n * (the number of B units equivalent to a single A unit)\r\n * the rate is returned as a fraction (numerator / denominator) for accuracy\r\n *\r\n * @param _tokenA token to get the rate of 1 unit of\r\n * @param _tokenB token to get the rate of 1 `_tokenA` against\r\n *\r\n * @return numerator\r\n * @return denominator\r\n */\r\n function latestRate(IERC20Token _tokenA, IERC20Token _tokenB)\r\n public\r\n view\r\n override\r\n supportedTokens(_tokenA, _tokenB)\r\n returns (uint256, uint256)\r\n {\r\n uint256 rateTokenA = uint256(tokensToOracles[_tokenA].latestAnswer());\r\n uint256 rateTokenB = uint256(tokensToOracles[_tokenB].latestAnswer());\r\n uint8 decimalsTokenA = tokenDecimals[_tokenA];\r\n uint8 decimalsTokenB = tokenDecimals[_tokenB];\r\n\r\n // the normalization works as follows:\r\n // - token A with decimals of dA and price of rateA per one token (e.g., for 10^dA weiA)\r\n // - token B with decimals of dB < dA and price of rateB per one token (e.g., for 10^dB weiB)\r\n // then the normalized rate, representing the rate between 1 weiA and 1 weiB is rateA / (rateB * 10^(dA - dB)).\r\n //\r\n // for example:\r\n // - token A with decimals of 5 and price of $10 per one token (e.g., for 100,000 weiA)\r\n // - token B with decimals of 2 and price of $2 per one token (e.g., for 100 weiB)\r\n // then the normalized rate would be: 5 / (2 * 10^3) = 0.0025, which is the correct rate since\r\n // 1 weiA costs $0.00005, 1 weiB costs $0.02, and weiA / weiB is 0.0025.\r\n\r\n if (decimalsTokenA > decimalsTokenB) {\r\n rateTokenB = rateTokenB.mul(uint256(10) ** (decimalsTokenA - decimalsTokenB));\r\n }\r\n else if (decimalsTokenA < decimalsTokenB) {\r\n rateTokenA = rateTokenA.mul(uint256(10) ** (decimalsTokenB - decimalsTokenA));\r\n }\r\n\r\n return (rateTokenA, rateTokenB);\r\n }\r\n\r\n /**\r\n * @dev returns the timestamp of the last price update\r\n *\r\n * @return timestamp\r\n */\r\n function lastUpdateTime()\r\n public\r\n view\r\n override\r\n returns (uint256) {\r\n // returns the oldest timestamp between the two\r\n uint256 timestampA = tokenAOracle.latestTimestamp();\r\n uint256 timestampB = tokenBOracle.latestTimestamp();\r\n\r\n return timestampA > timestampB ? timestampA : timestampB;\r\n }\r\n\r\n /**\r\n * @dev returns both the rate and the timestamp of the last update in a single call (gas optimization)\r\n *\r\n * @param _tokenA token to get the rate of 1 unit of\r\n * @param _tokenB token to get the rate of 1 `_tokenA` against\r\n *\r\n * @return numerator\r\n * @return denominator\r\n * @return timestamp of the last update\r\n */\r\n function latestRateAndUpdateTime(IERC20Token _tokenA, IERC20Token _tokenB)\r\n public\r\n view\r\n override\r\n returns (uint256, uint256, uint256)\r\n {\r\n (uint256 numerator, uint256 denominator) = latestRate(_tokenA, _tokenB);\r\n\r\n return (numerator, denominator, lastUpdateTime());\r\n }\r\n\r\n /** @dev returns the decimals of a given token */\r\n function decimals(IERC20Token _token) private view returns (uint8) {\r\n if (_token == ETH_ADDRESS) {\r\n return ETH_DECIMALS;\r\n }\r\n\r\n return _token.decimals();\r\n }\r\n}\r\n",
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"text": " @dev Provides the off-chain rate between two tokens\n The price oracle uses chainlink oracles internally to get the rates of the two tokens\n with respect to a common denominator, and then returns the rate between them, which\n is equivalent to the rate of TokenA / TokenB"
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