第107篇 Compound 中的 InterestRateModel

wonderBlock

于 2022-02-01 10:28:15 发布

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分类专栏：区块链应用文章标签：区块链以太坊智能合约 Compound

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本文深入剖析 Compound 中的 InterestRateModel，包括直线型和拐点型利率模型的原理、计算公式及图示。讨论了资金使用率、借款利率、存款利率的计算，并解释了利息的产生和汇率增加的机制。

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一、接口

先来看看 InterestRateModel.sol 合约代码：

pragma solidity ^0.5.16;

/**
  * @title Compound's InterestRateModel Interface
  * @author Compound
  */
contract InterestRateModel {
    /// @notice Indicator that this is an InterestRateModel contract (for inspection)
    bool public constant isInterestRateModel = true;

    /**
      * @notice Calculates the current borrow interest rate per block
      * @param cash The total amount of cash the market has
      * @param borrows The total amount of borrows the market has outstanding
      * @param reserves The total amount of reserves the market has
      * @return The borrow rate per block (as a percentage, and scaled by 1e18)
      */
    function getBorrowRate(uint cash, uint borrows, uint reserves) external vie

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