You're reading from Building Full Stack DeFi Applications

Product type Book

Published in Mar 2024

Publisher Packt

ISBN-13 9781837634118

Pages 490 pages

Edition 1st Edition

Languages

Concepts

Blockchain

Author (1):

Samuel Zhou

Table of Contents (21) Chapters

Preface

1. Part 1: Introduction to DeFi Application Development

2. Chapter 1: Introduction to DeFi

3. Chapter 2: Getting Started with DeFi Application Development

4. Chapter 3: Interacting with Smart Contracts and DeFi Wallets in the Frontend

5. Part 2: Design and Implementation of a DeFi Application for Trading Cryptos

6. Chapter 4: Introduction to Decentralized Exchanges

7. Chapter 5: Building Crypto-Trading Smart Contracts

8. Chapter 6: Implementing a Liquidity Management Frontend with Web3

9. Chapter 7: Implementing a Token-Swapping Frontend with Web3

10. Chapter 8: Working with Native Tokens

11. Part 3: Building a DeFi Application for Staking and Yield Farming

12. Chapter 9: Building Smart Contracts for Staking and Farming

13. Chapter 10: Implementing a Frontend for Staking and Farming

14. Part 4: Building a Crypto Loan App for Lending and Borrowing

15. Chapter 11: An Introduction to Crypto Loans

16. Chapter 12: Implementing an Asset Pool Smart Contract for a Crypto Loan

17. Chapter 13: Implementing a Price Oracle for Crypto Loans

18. Chapter 14: Implementing the Crypto Loan Frontend with Web3

19. Index

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Implementing a manipulation-resistant price oracle smart contract

In this section, we will implement the price oracle with an SMA strategy. Based on the discussion in the Building an on-chain price oracle with cumulative prices section of this chapter, we can conclude the following three main functions that need to be implemented in this section:

When the reserve amounts for a liquidity pool change, the TokenPair smart contract needs to update the cumulative prices of the tokens and the timestamp of the update. For a given block, the update for the liquidity pool should be performed only once, as shown in Figure 13.1.
For each period of the moving window, the price oracle will update the cumulative prices of the tokens and the timestamp for this period. The update should be performed at least once for each period.
The price oracle calculates the token’s SMA price for the current window. This is the function that is called by users and other smart contracts to...