├── .gitignore
├── LICENSE
├── README.md
├── chronological-issues-from-video.md
└── img
└── youtube_thumbnail.jpeg
/.gitignore:
--------------------------------------------------------------------------------
1 | .vscode
2 | .env
3 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
1 | MIT License
2 |
3 | Copyright (c) 2021 SmartContract
4 |
5 | Permission is hereby granted, free of charge, to any person obtaining a copy
6 | of this software and associated documentation files (the "Software"), to deal
7 | in the Software without restriction, including without limitation the rights
8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 |
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 |
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | _Big Update_: [New Sepolia Faucet Located Here](https://sepoliafaucet.com/).
2 | \Kovan, Ropsten, and Rinkeby have been deprecated. Goerli Still works but we highly recommend Sepolia as its proof of stake based.
3 |
4 | You'll need to verify via Twitter to get ETH & LINK.
5 | You can find [Backup Faucets here](https://docs.chain.link/docs/link-token-contracts/#goerli).
6 |
7 | Additionally, lesson 7 uses Chainlink VRF v1 instead of v2, [you can find the docs for Chainlink VRFv1 here](https://docs.chain.link/vrf/v1/examples/get-a-random-number).
8 |
9 | [YouTube Video](https://www.youtube.com/watch?v=M576WGiDBdQ)
10 |
11 |
12 |
13 |
14 | 
15 |
16 |
17 |
18 |
19 | Welcome to the repository for the Ultimate Solidity, Blockchain, and Smart Contract - Beginner to Expert Full Course | Python Edition FreeCodeCamp course!
20 |
21 | # Table of Contents
22 |
23 | - [Table of Contents](#table-of-contents)
24 | - [Resources For This Course](#resources-for-this-course)
25 | - [Questions](#questions)
26 | - [Windows Support](#windows-support)
27 | - [Hiccups/Issues from the Video](#hiccupsissues-from-the-video)
28 | - [Lesson 0: Welcome To Blockchain](#lesson-0-welcome-to-blockchain)
29 | - [What is a Blockchain?](#what-is-a-blockchain)
30 | - [Making Your First Transaction](#making-your-first-transaction)
31 | - [How Do Blockchains Work?](#how-do-blockchains-work)
32 | - [Consensus](#consensus)
33 | - [The Future](#the-future)
34 | - [Miscellaneous](#miscellaneous)
35 | - [Lesson 1: Welcome to Remix! Simple Storage](#lesson-1-welcome-to-remix-simple-storage)
36 | - [Everything in this section can be read about in the Solidity Documentation](#everything-in-this-section-can-be-read-about-in-the-solidity-documentation)
37 | - [Remix](#remix)
38 | - [Basic Solidity](#basic-solidity)
39 | - [Deploying to a "Live" network](#deploying-to-a-live-network)
40 | - [Lesson 2: Storage Factory](#lesson-2-storage-factory)
41 | - [Inheritance, Factory Pattern, and Interacting with External Contracts](#inheritance-factory-pattern-and-interacting-with-external-contracts)
42 | - [Lesson 3: Fund Me](#lesson-3-fund-me)
43 | - [Payable, msg.sender, msg.value, Units of Measure](#payable-msgsender-msgvalue-units-of-measure)
44 | - [Chainlink Oracles](#chainlink-oracles)
45 | - [Importing from NPM and Advanced Solidity](#importing-from-npm-and-advanced-solidity)
46 | - [Lesson 4: Web3.py Simple Storage](#lesson-4-web3py-simple-storage)
47 | - [Installing VSCode, Python, and Web3](#installing-vscode-python-and-web3)
48 | - [Our First Python Script with Web3.py - Deploying a Contract](#our-first-python-script-with-web3py---deploying-a-contract)
49 | - [Interacting with Our Contract in Python & Web3.py](#interacting-with-our-contract-in-python--web3py)
50 | - [Lesson 5: Brownie Simple Storage](#lesson-5-brownie-simple-storage)
51 | - [Brownie Introduction](#brownie-introduction)
52 | - [Installing Brownie](#installing-brownie)
53 | - [Brownie Simple Storage Project](#brownie-simple-storage-project)
54 | - [Testing Basics](#testing-basics)
55 | - [[Brownie console]](#brownie-console)
56 | - [Lesson 6: Brownie Fund Me](#lesson-6-brownie-fund-me)
57 | - [Introduction](#introduction)
58 | - [Dependencies, Deploying, and Networks](#dependencies-deploying-and-networks)
59 | - [Funding and Withdrawing Python Scripts](#funding-and-withdrawing-python-scripts)
60 | - [Testing across networks](#testing-across-networks)
61 | - [Git](#git)
62 | - [Compatibility with Ganache UI](#compatibility-with-ganache-ui)
63 | - [Lesson 7: SmartContract Lottery](#lesson-7-smartcontract-lottery)
64 | - [Introduction](#introduction-1)
65 | - [`Lottery.sol`](#lotterysol)
66 | - [Testing Lottery.sol](#testing-lotterysol)
67 | - [Lottery.sol Testnet Deployment](#lotterysol-testnet-deployment)
68 | - [Lesson 8: Chainlink Mix](#lesson-8-chainlink-mix)
69 | - [Brownie Mixes](#brownie-mixes)
70 | - [Lesson 9: ERC20s, EIPs, and Token Standards](#lesson-9-erc20s-eips-and-token-standards)
71 | - [Lesson 10: Defi & Aave](#lesson-10-defi--aave)
72 | - [Defi Intro](#defi-intro)
73 | - [Aave UI](#aave-ui)
74 | - [Programmatic Interactions with Aave](#programmatic-interactions-with-aave)
75 | - [Testing](#testing)
76 | - [Lesson 11: NFTs](#lesson-11-nfts)
77 | - [Non-Technical Explainer](#non-technical-explainer)
78 | - [Simple NFT](#simple-nft)
79 | - [SimpleCollectible Testing](#simplecollectible-testing)
80 | - [Advanced NFT](#advanced-nft)
81 | - [Advanced deploy_and_create](#advanced-deploy_and_create)
82 | - [Creating Metadata & IPFS](#creating-metadata--ipfs)
83 | - [Lesson 12: Upgrades](#lesson-12-upgrades)
84 | - [Introduction to upgrading smart contracts](#introduction-to-upgrading-smart-contracts)
85 | - [Upgrades-mix and code](#upgrades-mix-and-code)
86 | - [Testing Upgrades](#testing-upgrades)
87 | - [Upgrades on a testnet](#upgrades-on-a-testnet)
88 | - [Bonus Lesson 13: Full Stack Defi](#bonus-lesson-13-full-stack-defi)
89 | - [Defi Stake Yield Brownie Scripts & Tests](#defi-stake-yield-brownie-scripts--tests)
90 | - [Testing our Defi Stake Yield Brownie Dapp](#testing-our-defi-stake-yield-brownie-dapp)
91 | - [Front End / Full Stack](#front-end--full-stack)
92 | - [Closing and Summary](#closing-and-summary)
93 | - [Security](#security)
94 | - [Where do I go now?](#where-do-i-go-now)
95 | - [Learning More](#learning-more)
96 | - [Community](#community)
97 | - [Hackathons](#hackathons)
98 | - [Vyper](#vyper)
99 |
100 | # Resources For This Course
101 |
102 | ### Questions
103 |
104 | - [Github Discussions](https://github.com/smartcontractkit/full-blockchain-solidity-course-py/discussions)
105 | - Ask questions and chat about the course here!
106 | - [Stack Exchange Ethereum](https://ethereum.stackexchange.com/)
107 | - Great place for asking technical questions about Ethereum
108 | - [StackOverflow](https://stackoverflow.com/)
109 | - Great place for asking technical questions overall
110 |
111 | ### Windows Support
112 |
113 | - [Setup your windows environment](https://medium.com/@cromewar/how-to-setup-windows-10-11-for-smart-contract-development-and-brownie-e7d8d13555b3)
114 | - Learn how to install all the tools you will need for this course on a windows machine
115 |
116 | ### Hiccups/Issues from the Video
117 |
118 | - [Chronological Issues from the Video](https://github.com/smartcontractkit/full-blockchain-solidity-course-py/blob/main/chronological-issues-from-video.md)
119 | - A list of known hiccups/issues you may encounter while implementing the content from the video
120 |
121 | # Lesson 0: Welcome To Blockchain
122 |
123 | ## What is a Blockchain?
124 |
125 | - [Bitcoin Whitepaper](https://bitcoin.org/bitcoin.pdf)
126 | - [Ethereum Whitepaper](https://ethereum.org/en/whitepaper/)
127 | - [Hybrid Smart Contracts](https://blog.chain.link/hybrid-smart-contracts-explained/)
128 | - [Blockchain Oracles](https://betterprogramming.pub/what-is-a-blockchain-oracle-f5ccab8dbd72?source=friends_link&sk=d921a38466df8a9176ed8dd767d8c77d)
129 | - [What is a blockchain](https://www.investopedia.com/terms/b/blockchain.asp)
130 |
131 | ## Making Your First Transaction
132 |
133 | - [Metamask](https://metamask.io/)
134 | - [Etherscan](https://etherscan.io/)
135 | - [Goerli Etherscan](https://goerli.etherscan.io/)
136 | - [Kovan Etherscan](https://kovan.etherscan.io/)
137 | - [Goerli Faucet](https://faucets.chain.link/goerli)
138 | - [Sepolia Faucet](https://sepoliafaucet.com/)
139 | - [Sepolia Etherscan](https://sepolia.etherscan.io/)
140 |
141 | - Rinkeby Faucet (Check the [link token contracts page](https://docs.chain.link/docs/link-token-contracts/#rinkeby))
142 | - NOTE: You can always find the most up to date faucets at [faucets.chain.link](https://faucets.chain.link/).
143 | - OR, use the [Kovan ETH Faucet](https://faucets.chain.link/), just be sure to swap your metamask to kovan!
144 | - [Gas and Gas Fees](https://ethereum.org/en/developers/docs/gas/)
145 | - [Wei, Gwei, and Ether Converter](https://eth-converter.com/)
146 | - [ETH Gas Station](https://ethgasstation.info/)
147 |
148 | ## How Do Blockchains Work?
149 |
150 | - [Blockchain Demo](https://andersbrownworth.com/blockchain/)
151 | - [Public / Private Keys](https://andersbrownworth.com/blockchain/public-private-keys/keys)
152 | - [Layer 2 and Rollups](https://ethereum.org/en/developers/docs/scaling/layer-2-rollups/)
153 | - [Decentralized Blockchain Oracles](https://blog.chain.link/what-is-the-blockchain-oracle-problem/)
154 | - [Block Rewards](https://www.investopedia.com/terms/b/block-reward.asp)
155 | - [Run Your Own Ethereum Node](https://geth.ethereum.org/docs/getting-started)
156 |
157 | ### Consensus
158 |
159 | - [Consensus](https://wiki.polkadot.network/docs/learn-consensus)
160 | - [Proof of Stake](https://ethereum.org/en/developers/docs/consensus-mechanisms/pos/)
161 | - [Proof of Work](https://ethereum.org/en/developers/docs/consensus-mechanisms/pow/)
162 | - [Nakamoto Consensus](https://blockonomi.com/nakamoto-consensus/)
163 |
164 | ## The Future
165 |
166 | - [Ethereum 2](https://ethereum.org/en/eth2/)
167 |
168 | ## Miscellaneous
169 |
170 | - [DAOs](https://www.investopedia.com/tech/what-dao/)
171 |
172 | # Lesson 1: [Welcome to Remix! Simple Storage](https://github.com/PatrickAlphaC/simple_storage)
173 |
174 | 💻 Code: https://github.com/PatrickAlphaC/simple_storage
175 |
176 | ### Everything in this section can be read about in the [Solidity Documentation](https://docs.soliditylang.org/en/v0.8.6/index.html)
177 |
178 | ### [Remix](https://remix.ethereum.org/)
179 |
180 | ### Basic Solidity
181 |
182 | - Versioning
183 | - Compiling
184 | - Contract Declaration
185 | - [Types & Declaring Variables](https://docs.soliditylang.org/en/v0.8.6/types.html)
186 | - `uint256`, `int256`, `bool`, `string`, `address`, `bytes32`
187 | - Default Initializations
188 | - Comments
189 | - Functions
190 | - Deploying a Contract
191 | - Calling a public state-changing Function
192 | - [Visibility](https://docs.soliditylang.org/en/v0.7.3/contracts.html#visibility-and-getters)
193 | - Scope
194 | - View & Pure Functions
195 | - Structs
196 | - Intro to Storage
197 | - Arrays - Dynamic & Fixed sized
198 | - Compiler Errors and Warnings
199 | - Memory
200 | - Mappings
201 | - SPDX License
202 | - Recap
203 |
204 | ### Deploying to a "Live" network
205 |
206 | - A testnet or mainnet
207 | - [Find a faucet here](https://faucets.chain.link/)
208 | - Connecting Metamask
209 | - Interacting with Deployed Contracts
210 | - The EVM
211 |
212 | # Lesson 2: [Storage Factory](https://github.com/PatrickAlphaC/storage_factory)
213 |
214 | 💻 Code: https://github.com/PatrickAlphaC/storage_factory
215 |
216 | ### Inheritance, Factory Pattern, and Interacting with External Contracts
217 |
218 | - Factory Pattern
219 | - Imports
220 | - Deploy a Contract From a Contract
221 | - Interact With a Deployed Contract
222 | - Recap
223 |
224 | # Lesson 3: [Fund Me](https://github.com/PatrickAlphaC/fund_me)
225 |
226 | 💻 Code: https://github.com/PatrickAlphaC/fund_me
227 |
228 | ### Payable, msg.sender, msg.value, Units of Measure
229 |
230 | - Payable
231 | - [Wei/Gwei/Eth Converter](https://eth-converter.com/)
232 | - msg.sender & msg.value
233 |
234 | ### Chainlink Oracles
235 |
236 | - Decentralized Oracle Network Chainlink
237 | - Blockchains can't make API calls
238 | - Centralized Nodes are Points of Failure
239 | - [data.chain.link](https://data.chain.link/)
240 | - Getting External Data with Chainlink Oracles
241 | - [Chainlink](https://docs.chain.link/)
242 | - [Faucets and Contract Addresses](https://docs.chain.link/docs/link-token-contracts/)
243 | - [Kovan](https://docs.chain.link/docs/link-token-contracts/#kovan)
244 | - [Getting Price Information](https://docs.chain.link/docs/get-the-latest-price/)
245 |
246 | ### Importing from NPM and Advanced Solidity
247 |
248 | - Decimals/Floating Point Numbers in Solidity
249 | - latestRoundData
250 | - Importing from NPM in Remix
251 | - Interfaces
252 | - Introduction to ABIs
253 | - [Getting Price Feed Addresses](https://docs.chain.link/docs/reference-contracts/)
254 | - getPrice
255 | - Tuples
256 | - Unused Tuple Variables
257 | - Matching Units (WEI/GWEI/ETH)
258 | - getConversionRate
259 | - Matching Units (Continued)
260 | - SafeMath & Integer Overflow
261 | - using keyword
262 | - [Libraries](https://docs.soliditylang.org/en/v0.8.6/contracts.html#libraries)
263 | - SafeMath PSA
264 | - Setting a Threshold
265 | - Require
266 | - Revert
267 | - Withdraw Function
268 | - Transfer
269 | - Balance
270 | - this
271 | - Contract Owners
272 | - Constructor
273 | - ==
274 | - Modifiers
275 | - Resetting
276 | - for loop
277 | - Array Length
278 | - Forcing a Transaction
279 | - Recap
280 |
281 | # Lesson 4: [Web3.py Simple Storage](https://github.com/PatrickAlphaC/web3_py_simple_storage)
282 |
283 | 💻 Code: https://github.com/PatrickAlphaC/web3_py_simple_storage
284 |
285 | ### Installing VSCode, Python, and Web3
286 |
287 | - [Developer Bootcamp Setup Instructions (metamask, vscode, python, nodejs..)](https://chain.link/bootcamp/brownie-setup-instructions)
288 | - [VSCode](https://code.visualstudio.com/download)
289 | - [VSCode Crash Course](https://www.youtube.com/watch?v=WPqXP_kLzpo)
290 | - Extensions
291 | - Short Cuts:
292 | - [VSCode Shortcuts](https://code.visualstudio.com/docs/getstarted/keybindings)
293 | - [VSCode MacOS Shortcuts](https://code.visualstudio.com/shortcuts/keyboard-shortcuts-macos.pdf)
294 | - [Python](https://www.python.org/downloads/)
295 | - Install Troubleshooting
296 | - Terminal
297 | - Making a directory/Folder
298 | - Opening the folder up with VSCode
299 | - Creating a new file
300 | - Syntax Highlights
301 | - Remember to save!
302 | - Setting linting compile version
303 | - VSCode Solidity Settings
304 | - Formatting & Format on Save
305 | - Solidity Prettier
306 | - [Python Black](https://pypi.org/project/black/)
307 | - [pip](https://pypi.org/project/pip/)
308 |
309 | ### Our First Python Script with Web3.py - Deploying a Contract
310 |
311 | - Reading our solidity file
312 | - Running a Python Script in the Terminal
313 | - [MaxOS Shortcuts](https://code.visualstudio.com/shortcuts/keyboard-shortcuts-macos.pdf)
314 | - [Windows Shortcuts](https://code.visualstudio.com/shortcuts/keyboard-shortcuts-windows.pdf)
315 | - [Linux Shortcuts](https://code.visualstudio.com/shortcuts/keyboard-shortcuts-linux.pdf)
316 | - Compiling in Python
317 | - [py-solc-x](https://pypi.org/project/py-solc-x/)
318 | - compile_standard
319 | - Colorized Brackets
320 | - JSON ABI
321 | - Saving Compiled Code
322 | - Formatting JSON
323 | - Deploying in Python
324 | 1. Get Bytecode
325 | 2. Get ABI
326 | 3. Choose Blockchain to Deploy To
327 | - Local Ganache Chain
328 | - [Ganache UI](https://www.trufflesuite.com/ganache)
329 | - [Ganache Command Line](https://github.com/trufflesuite/ganache-cli)
330 | - [Web3.py](https://web3py.readthedocs.io/en/stable/)
331 | - HTTP / RPC Provider
332 | - Private Keys MUST start with "0x"
333 | - Contract Object
334 | - Building a Transaction
335 | - Account Nonce
336 | - Calling "Constructor"
337 | - Transaction Parameters
338 | - Signing the Transaction
339 | - NEVER put your private key directly in your code
340 | - [Setting Environment Variables (Windows, Linux, MacOS)](https://www.twilio.com/blog/2017/01/how-to-set-environment-variables.html)
341 | - [More on Windows Environment Variables](https://www.youtube.com/watch?v=tqWDiu8a4gc&t=40s)
342 | - Exported Environment Variables Only Last the Duration of the Shell/Terminal
343 | - Private Key PSA
344 | - .env file
345 | - .gitignore
346 | - Loading .env File in Python
347 | - [python-dotenv](https://pypi.org/project/python-dotenv/)
348 | - Viewing our Transaction / Deployment in Ganache
349 | - Waiting for Block Confirmations
350 |
351 | ### Interacting with Our Contract in Python & Web3.py
352 |
353 | - 2 Things you always need
354 | 1. Contract Address
355 | 2. Contract ABI
356 | - Getting address from transaction receipt
357 | - Calling a view function with web3.py
358 | - Call vs Transact
359 | - Updating State with Web3.py
360 | - [ganache-cli](https://github.com/trufflesuite/ganache-cli)
361 | - Installing Ganache
362 | - [Install Nodejs](https://nodejs.org/en/)
363 | - [Install Yarn](https://classic.yarnpkg.com/en/docs/install)
364 | - Working with ganache-cli
365 | - Open a new terminal in the same window
366 | - Deploying to a testnet
367 | - [Infura](https://infura.io/)
368 | - [Alchemy](https://www.alchemy.com/)
369 | - Using Infura RPC URL / HTTP Provider
370 | - [Chain Ids](https://chainlist.org/)
371 | - Wow this seems like a lot of work... Is there a better way?
372 |
373 | # Lesson 5: [Brownie Simple Storage](https://github.com/PatrickAlphaC/brownie_simple_storage)
374 |
375 | 💻 Code: https://github.com/PatrickAlphaC/brownie_simple_storage
376 |
377 | ### Brownie Introduction
378 |
379 | - Some Users:
380 | - https://yearn.finance/
381 | - https://curve.fi/
382 | - https://badger.finance/
383 |
384 | ### Installing Brownie
385 |
386 | - [Installing Brownie](https://eth-brownie.readthedocs.io/en/stable/install.html)
387 | - Install pipx
388 | - pipx install eth-brownie
389 | - Testing Successful Install
390 |
391 | ### Brownie Simple Storage Project
392 |
393 | - A new Brownie project with `brownie init`
394 | - Project Basic Explanation
395 | - Adding `SimpleStorage.sol` to the `contracts` folder
396 | - Compiling with `brownie compile`
397 | - Brownie deploy script
398 | - `def main` is brownie's entry point
399 | - brownie defaults to a `development` `ganache` chain that it creates
400 | - Placing functions outside of the `main` function
401 | - brownie `accounts`
402 | - 3 Ways to Add Accounts
403 | 1. `accounts[0]`: Brownie's "default" ganache accounts
404 | - Only works for local ganache
405 | 2. `accounts.load("...")`: Brownie's encrypted command line (MOST SECURE)
406 | - Run `brownie accounts new ` and enter your private key and a password
407 | 3. `accounts.add(config["wallets"]["from_key"])`: Storing Private Keys as an environment variable, and pulling from our `brownie-config.yaml`
408 | - You'll need to add `dotenv: .env` to your `brownie-config.yaml` and have a `.env` file
409 | - Importing a Contract
410 | - Contract.Deploy
411 | - View Function Call in Brownie
412 | - State-Changing Function Call in Brownie / Contract Interaction
413 | - `transaction.wait(1)`
414 |
415 | ### Testing Basics
416 |
417 | - `test_simple_storage.py`
418 | - Arrange, Act, Assert
419 | - [`assert`](https://docs.pytest.org/en/6.2.x/assert.html)
420 | - `brownie test`
421 | - `test_updating_storage`
422 | - [Pytest / Brownie Test Tips](https://docs.pytest.org/en/6.2.x/)
423 | - Deploy to a Testnet
424 | - `brownie networks list`
425 | - Development vs Ethereum
426 | - Development is temporary
427 | - Ethereum networks persist
428 | - RPC URL / HTTP Provider in Brownie
429 | - The network flag
430 | - `list index out of range`
431 | - `get_account()`
432 | - `networks.show_active()`
433 | - build/deployments
434 | - Accessing previous deployments
435 | - Interacting with contracts deployed in our brownie project
436 |
437 | ### [Brownie console]
438 |
439 | - `brownie console`
440 |
441 | # Lesson 6: [Brownie Fund Me](https://github.com/PatrickAlphaC/brownie_fund_me)
442 |
443 | 💻 Code: https://github.com/PatrickAlphaC/brownie_fund_me
444 |
445 | ### Introduction
446 |
447 | - Setup
448 |
449 | ### Dependencies, Deploying, and Networks
450 |
451 | - Dependencies
452 | - [chainlink-brownie-contracts](https://github.com/smartcontractkit/chainlink-brownie-contracts)
453 | - remappings
454 | - Deploy Script (V1)
455 | - `helpful_scripts.py`
456 | - `__init__.py`
457 | - Deploy to Rinkeby
458 | - Contract Verification (`publish_source`)
459 | - The Manual Way
460 | - "Flattening"
461 | - The Programmatic Way
462 | - Getting an [Etherscan API Key](https://etherscan.io/apis)
463 | - `ETHERSCAN_TOKEN`
464 | - Interacting with Etherscan
465 | - Deploying to Local Chains
466 | - Introduction to Mocking
467 | - Constructor Parameters
468 | - `networks` in our `brownie-config.yaml`
469 | - Copying [Mock Contracts from chainlink-mix](https://github.com/smartcontractkit/chainlink-mix)
470 | - Deploying and using our mock
471 | - Refactoring
472 | - Deploying to a persistent ganache
473 | - brownie attach
474 | - Adding a persistent brownie network
475 | - resetting a network build
476 |
477 | ### Funding and Withdrawing Python Scripts
478 |
479 | - Whoops! Let's fix an issue...
480 | - Fund Script
481 | - Withdraw Script
482 |
483 | ### Testing across networks
484 |
485 | - `test_can_fund_and_withdraw`
486 | - default networks
487 | - pytest `pip install pytest`
488 | - pytest.skip
489 | - brownie exceptions
490 | - `mainnet-fork`
491 | - Custom mainnet fork
492 | - Adding a development brownie network
493 | - `brownie networks add development mainnet-fork-dev cmd=ganache-cli host=http://127.0.0.1 fork='https://infura.io/v3/$WEB3_INFURA_PROJECT_ID' accounts=10 mnemonic=brownie port=8545`
494 | - [Alchemy](https://www.alchemy.com/)
495 | - `brownie test --network mainnet-fork`
496 | - brownie ganache vs local ganache vs mainnet-fork vs testnet...
497 |
498 | ### Git
499 |
500 | - [Installing Git](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git)
501 | - Creating a repository
502 | - [First time with git](https://git-scm.com/book/en/v2/Getting-Started-First-Time-Git-Setup)
503 | - [Adding our project to github](https://docs.github.com/en/github/importing-your-projects-to-github/importing-source-code-to-github/adding-an-existing-project-to-github-using-the-command-line)
504 | - Tweet it out!
505 |
506 | ### Compatibility with Ganache UI
507 |
508 | - `test_only_owner_can_withdraw()` gives below error if the selected network is Ganache UI::
509 |
510 | ```
511 | E ValueError: Execution reverted during call: 'VM Exception while processing transaction: revert'. This transaction will likely revert. If you wish to broadcast, include `allow_revert:True` as a transaction parameter.
512 | ```
513 |
514 | [More information here.](https://ethereum.stackexchange.com/questions/114889/deploying-ganache-local-w-brownie-vm-exception-while-processing-transaction-in)
515 |
516 | # Lesson 7: [SmartContract Lottery](https://github.com/PatrickAlphaC/smartcontract-lottery)
517 |
518 | 💻 Code: https://github.com/PatrickAlphaC/smartcontract-lottery
519 |
520 | [Chainlink VRF v1 docs](https://docs.chain.link/vrf/v1/examples/get-a-random-number)
521 |
522 | ### Introduction
523 |
524 | - Add a `README.md`
525 | - Defining the project
526 | - Is it decentralized?
527 |
528 | ### `Lottery.sol`
529 |
530 | - basic setup
531 | - Main Functions
532 | - address payable[]
533 | - getEntranceFee & Setup
534 | - [Chainlink Price Feed](https://docs.chain.link/docs/get-the-latest-price/)
535 | - brownie-config
536 | - SPDX
537 | - Matching Units of Measure
538 | - Can't just divide
539 | - Test early and often
540 | - Quick Math Sanity Check
541 | - deleting networks
542 | - [Alchemy](https://www.alchemy.com/) again
543 | - Enum
544 | - `startLottery`
545 | - [Openzeppelin](https://openzeppelin.com/contracts/)... Is this the first openzeppelin reference?
546 | - [Openzeppelin Contracts Github](https://github.com/OpenZeppelin/openzeppelin-contracts)
547 | - Randomness
548 | - Pseudorandomness
549 | - `block` keyword
550 | - `block.difficulty`
551 | - `block.timestamp`
552 | - `keccack256`
553 | - [True Randomness with Chainlink VRF](https://docs.chain.link/docs/get-a-random-number/)
554 | - [VRFConsumerBase.sol](https://github.com/smartcontractkit/chainlink/blob/develop/contracts/src/v0.8/vrf/VRFConsumerBase.sol)
555 | - Chainlink VRF Remix Version
556 | - Inheriting Constructors
557 | - Oracle Gas & Transaction Gas
558 | - [Why didn't we pay gas on the price feeds?](https://ethereum.stackexchange.com/questions/87473/is-chainlinks-price-reference-data-free-to-consume)
559 | - Chainlink Node Fees
560 | - [Request And Receive Introduction](https://docs.chain.link/docs/architecture-request-model/)
561 | - [Kovan Faucets](https://docs.chain.link/docs/link-token-contracts/#kovan)
562 | - Funding Chainlink Contracts
563 | - [Request And Receive Explanation](https://docs.chain.link/docs/architecture-request-model/)
564 | - A Clarification
565 | - `endLottery`
566 | - `returns (type variableName)`
567 | - `fulfillRandomness`
568 | - `override`
569 | - Modulo Operation (Mod Operation %)
570 | - Paying the lottery winner
571 | - Resetting the lottery
572 |
573 | ### Testing Lottery.sol
574 |
575 | - `deploy_lottery.py`
576 | - `get_account()` refactored
577 | - `get_contract`
578 | - `contract_to_mock`
579 | - `Contract.from_abi`
580 | - Adding the parameters to deploying to lottery
581 | - `vrfCoordinatorMock` and adding mocks
582 | - `LinkToken` and Mocks
583 | - Successful Ganache Deployment!
584 | - Python Lottery Scripts/Functions
585 | - `start_lottery`
586 | - Brownie tip: Remember to `tx.wait(1)` your last transaction
587 | - `enter_lottery`
588 | - `end_lottery`
589 | - Funding with LINK
590 | - brownie interfaces
591 | - Waiting for callback
592 | - Integration Tests & Unit Tests
593 | - Test all lines of code
594 | - `test_get_entrance_fee`
595 | - `pytest.skip` (again)
596 | - `test_cant_enter_unless_started`
597 | - `test_can_start_and_enter_lottery`
598 | - `test_can_pick_winner_correctly`
599 | - Events and Logs
600 | - `callBackWithRandomness`
601 |
602 | ### Lottery.sol Testnet Deployment
603 |
604 | - `topics`
605 | - [conftest.py](https://stackoverflow.com/questions/34466027/in-pytest-what-is-the-use-of-conftest-py-files)
606 |
607 | # Lesson 8: [Chainlink Mix](https://github.com/smartcontractkit/chainlink-mix)
608 |
609 | 💻 Code: https://github.com/smartcontractkit/chainlink-mix
610 |
611 | ## [Brownie Mixes](https://github.com/brownie-mix)
612 |
613 | # Lesson 9: [ERC20s, EIPs, and Token Standards](https://github.com/PatrickAlphaC/erc20-brownie-py)
614 |
615 | 💻 Code: https://github.com/PatrickAlphaC/erc20-brownie-py
616 |
617 | - [ERC20/EIP20 Standard](https://eips.ethereum.org/EIPS/eip-20)
618 | - What is an ERC20?
619 | - Creating an ERC20
620 | - [OpenZeppelin ERC20](https://docs.openzeppelin.com/contracts/2.x/api/token/erc20)
621 | - [Solidity 0.8](https://docs.soliditylang.org/en/breaking/080-breaking-changes.html)
622 | - I Challenge you to code this yourself!
623 | - `deploy_token.py`
624 | - Copy paste `helpful_scripts.py`
625 | - Viewing our token in metamask
626 | - Adding to an exchange
627 |
628 | # Lesson 10: [Defi & Aave](https://github.com/PatrickAlphaC/aave_brownie_py_freecode)
629 |
630 | \*NOTE: This repo is now archived as kovan is no longer supported. You can still follow along with the learning, but know the code may not work the same on a different testnet.
631 |
632 | 💻 Code: https://github.com/PatrickAlphaC/aave_brownie_py_freecode
633 |
634 | ### Defi Intro
635 |
636 | - [Defipulse](https://defipulse.com/)
637 | - [Defillama](https://defillama.com/)
638 | - [Aave Testnet Site](https://staging.aave.com/)
639 | - [Paraswap](https://paraswap.io/)
640 | - Decentralized Exchange
641 |
642 | ### Aave UI
643 |
644 | - [Kovan ETH](https://docs.chain.link/docs/link-token-contracts/#kovan)
645 | - What is Aave?
646 | - Borrowing and Lending
647 | - Connecting to Aave
648 | - Depositing Tokens / Lending
649 | - Checking your transaction is correct
650 | - WETH Gateway
651 | - Interest Bearing Token (aToken)
652 | - Collateral
653 | - [DAI](https://makerdao.com/en/)
654 | - [Stablecoin](https://www.investopedia.com/terms/s/stablecoin.asp)
655 | - [Wrapped Bitcoin (wBTC)](https://www.gemini.com/cryptopedia/wrapped-bitcoin-what-can-you-do)
656 | - [Why borrow tokens?](https://docs.aave.com/faq/borrowing)
657 | - [Blockchain Fintech Tutorial](https://blog.chain.link/blockchain-fintech-defi-tutorial-lending-borrowing-python/)
658 | - DISCLAIMER ABOUT BORROWING
659 | - Borrowing Tokens
660 | - [Liquidations](https://docs.aave.com/faq/liquidations)
661 | - Your health factor must be above 1
662 | - [Solvent](https://www.investopedia.com/terms/s/solvency.asp)
663 | - [Stable vs Variable Interest Rate](https://docs.aave.com/faq/borrowing#what-is-the-difference-between-stable-and-variable-rate)
664 | - Repaying our borrows/loans
665 | - Reward token / governance token
666 | - Governance
667 |
668 | ### [Programmatic Interactions with Aave](https://github.com/PatrickAlphaC/aave_brownie_py_freecode)
669 |
670 | - Quant Defi Engineer
671 | - [Aave Documentation](https://docs.aave.com/developers/)
672 | - Setup
673 | - Converting ETH -> WETH
674 | - `get_weth.py`
675 | - [IWETH](https://github.com/PatrickAlphaC/aave_brownie_py/blob/main/interfaces/WethInterface.sol)
676 | - [Kovan WETH Token Address: 0xd0a1e359811322d97991e03f863a0c30c2cf029c](https://kovan.etherscan.io/token/0xd0a1e359811322d97991e03f863a0c30c2cf029c)
677 | - [Mainnet WETH Token Address: 0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2](https://etherscan.io/token/0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2)
678 | - Converting WETH -> ETH with `withdraw`
679 | - `aave_borrow.py`
680 | - [LendingPool](https://docs.aave.com/developers/the-core-protocol/lendingpool)
681 | - [LendingPoolAddressProvider](https://docs.aave.com/developers/the-core-protocol/addresses-provider)
682 | - [LendingPool and LendingPoolAddressProvider Addresses](https://docs.aave.com/developers/deployed-contracts/deployed-contracts)
683 | - Fixing import dependencies
684 | - [Aave Github](https://github.com/aave/protocol-v2)
685 | - [ERC20 Approve Function](https://medium.com/ethex-market/erc20-approve-allow-explained-88d6de921ce9)
686 | - [IERC20 from Patrick's repo](https://github.com/PatrickAlphaC/aave_brownie_py/blob/main/interfaces/IERC20.sol)
687 | - `deposit`
688 | - [getUserAccountData](https://docs.aave.com/developers/the-core-protocol/lendingpool#getuseraccountdata)
689 | - Liquidation Threshold
690 | - [Risk Parameters](https://docs.aave.com/risk/asset-risk/risk-parameters)
691 | - Borrowing DAI
692 | - Getting DAI Conversion Rate
693 | - [Chainlink Price Feeds](https://docs.chain.link/docs/reference-contracts/)
694 | - [AggregatorV3Interface](https://github.com/PatrickAlphaC/aave_brownie_py/blob/main/interfaces/AggregatorV3Interface.sol)
695 | - [borrow](https://docs.aave.com/developers/the-core-protocol/lendingpool#borrow)
696 | - [Mainnet DAI Address: 0x6b175474e89094c44da98b954eedeac495271d0f](https://etherscan.io/token/0x6b175474e89094c44da98b954eedeac495271d0f)
697 | - [Aave Testnet Token Addresses](https://aave.github.io/aave-addresses/kovan.json)
698 | - Repaying
699 | - Kovan Run
700 | - Viewing the transactions
701 |
702 | ### Testing
703 |
704 | # Lesson 11: [NFTs](https://github.com/PatrickAlphaC/nft-demo)
705 |
706 | 💻 Code: https://github.com/PatrickAlphaC/nft-demo
707 |
708 | ### Non-Technical Explainer
709 |
710 | - [End-to-end article](https://www.freecodecamp.org/news/how-to-make-an-nft-and-render-on-opensea-marketplace/)
711 | - What is an NFT?
712 | - [ERC721](https://eips.ethereum.org/EIPS/eip-721)
713 | - Token URI
714 | - [Token Metadata Example](https://docs.opensea.io/docs/2-adding-metadata)
715 | - [IPFS](https://ipfs.io/)
716 |
717 | ### Simple NFT
718 |
719 | - [brownie mix](https://github.com/PatrickAlphaC/nft-mix)
720 | - Initial Setup
721 | - `SimpleCollectible.sol`
722 | - [OpenZeppelin ERC721](https://docs.openzeppelin.com/contracts/3.x/)
723 | - [Pug Image](https://github.com/PatrickAlphaC/nft-mix/blob/main/img/pug.png)
724 | - NFT Constructor
725 | - NFT is a type of factory pattern
726 | - `createCollectible`
727 | - `_safeMint`
728 | - TokenURI & Metadata
729 | - Opensea listing example
730 | - Is this decentralized?
731 | - Ethereum Size and dStorage
732 | - [Ethereum Size](https://ycharts.com/indicators/ethereum_chain_full_sync_data_size)
733 | - [dStorage Solutions](https://ethereum.org/en/developers/docs/storage/)
734 | - [IPFS](https://www.ipfs.com/)
735 | - You need to have your NFT attributes both on-chain and inside your tokenURI metadata
736 | - `deploy_and_create.py`
737 | - [TokenURI used for the demo: https://ipfs.io/ipfs/Qmd9MCGtdVz2miNumBHDbvj8bigSgTwnr4SbyH6DNnpWdt?filename=0-PUG.json](https://ipfs.io/ipfs/Qmd9MCGtdVz2miNumBHDbvj8bigSgTwnr4SbyH6DNnpWdt?filename=0-PUG.json)
738 | - [IPFS Companion](https://chrome.google.com/webstore/detail/ipfs-companion/nibjojkomfdiaoajekhjakgkdhaomnch?hl=en)
739 | - Rinkeby Deployment
740 | - [Opensea Example](https://testnets.opensea.io/assets/0x8acb7ca932892eb83e4411b59309d44dddbc4cdf/0)
741 |
742 | ### SimpleCollectible Testing
743 |
744 | - What else with NFTs?
745 |
746 | ### Advanced NFT
747 |
748 | - `AdvancedCollectible.sol`
749 | - [Dungeons and Dragons Example](https://github.com/PatrickAlphaC/dungeons-and-dragons-nft)
750 | - Double Inherited Constructors
751 | - `createCollectible` (Advanced)
752 | - `tokenIdToBreed`
753 | - Working with in-flight Chainlink VRF requests
754 | - Download the NFT images from the [nft-mix](https://github.com/PatrickAlphaC/nft-mix)
755 | - `setTokenURI`
756 | - `_isApprovedOrOwner`
757 | - Emit events when you update mappings
758 | - [`indexed` event keyword](https://ethereum.stackexchange.com/questions/8658/what-does-the-indexed-keyword-do/8659)
759 |
760 | ### Advanced deploy_and_create
761 |
762 | - Move `OPENSEA_URL` to `helpful_scripts`
763 | - Deploying AdvancedCollectible
764 | - Opensea testnet is only compatible with Rinkeby
765 | - [Rinkeby Chainlink VRF Contract Addresses](https://docs.chain.link/docs/vrf-contracts/#rinkeby)
766 | - Speeding through adding functions from previous projects
767 | - Deploy to Rinkeby
768 | - `create_collectible.py`
769 | - A quick unit test
770 | - A quick integration test
771 |
772 | ### Creating Metadata & IPFS
773 |
774 | - `create_metadata.py`
775 | - `get_breed`
776 | - Metadata Folder
777 | - `metadata_template`
778 | - NFT Metadata Attributes
779 | - Checking if Metadata file already exists
780 | - Uploading to IPFS
781 | - `upload_to_ipfs`
782 | - [Download IPFS Command Line](https://docs.ipfs.io/install/command-line/)
783 | - [Download IPFS Desktop](https://docs.ipfs.io/install/ipfs-desktop/)
784 | - [HTTP IPFS Docs](https://docs.ipfs.io/reference/http/api/)
785 | - `ipfs daemon`
786 | - [Pinata](https://app.pinata.cloud/)
787 | - [Pinata Docs](https://docs.pinata.cloud/)
788 | - Refactoring to not re-upload to IPFS
789 | - Setting the TokenURI
790 | - End-To-End Manual Testnet Test
791 | - Viewing on Opensea
792 |
793 | # Lesson 12: [Upgrades](https://github.com/PatrickAlphaC/upgrades-mix)
794 |
795 | 💻 Code: https://github.com/PatrickAlphaC/upgrades-mix
796 |
797 | ### Introduction to upgrading smart contracts
798 |
799 | - [Original Video](https://www.youtube.com/watch?v=bdXJmWajZRY)
800 | - Smart Contracts can be upgraded!
801 | - Does this mean they are not immutable?
802 | - [Trail of Bits on Upgradeable Smart Contracts](https://blog.trailofbits.com/2018/09/05/contract-upgrade-anti-patterns/)
803 | - The "Not Really Upgrading" / Parameterization Method
804 | - The Social Yeet / Migration Method
805 | - [Contract Migration](https://blog.trailofbits.com/2018/10/29/how-contract-migration-works/)
806 | - Proxies
807 | - DelegateCall
808 | - Terminology:
809 | - Implementation Contract
810 | - Proxy Contract
811 | - User
812 | - Admin
813 | - Gotchas:
814 | - Storage Clashes
815 | - Function Selector
816 | - Function Selector Clashes
817 | - Proxy Patterns:
818 | - [Transparent Proxy Pattern](https://blog.openzeppelin.com/the-transparent-proxy-pattern/)
819 | - [Universal Upgrade Proxy Standard](https://eips.ethereum.org/EIPS/eip-1822)
820 | - [Diamond/Multi-Facet Proxy](https://eips.ethereum.org/EIPS/eip-2535)
821 |
822 | ### Upgrades-mix and code
823 |
824 | - Setup
825 | - `Box.sol`
826 | - `BoxV2.sol`
827 | - Getting the proxy contracts
828 | - [Openzeppelin Proxy Github](https://github.com/OpenZeppelin/openzeppelin-contracts/tree/master/contracts/proxy/transparent)
829 | - `01_deploy_box.py`
830 | - Hooking up a proxy to our implementation contract
831 | - (Optional) [Creating a Gnosis Safe](https://help.gnosis-safe.io/en/articles/3876461-create-a-safe)
832 | - Initializers
833 | - Encoding Initializer Function
834 | - Assigning ABI to a proxy
835 | - Running the script
836 | - Upgrade Python Function
837 |
838 | ### Testing Upgrades
839 |
840 | - Testing our proxy
841 | - Testing our upgrades
842 |
843 | ### Upgrades on a testnet
844 |
845 | # Bonus Lesson 13: [Full Stack Defi](https://github.com/PatrickAlphaC/defi-stake-yield-brownie-freecode)
846 |
847 | _Note: This section is archived as kovan is now deprecated. If you're looking to learn more Full-stack, check out the full stack portions of the hardhat/javascript video._
848 |
849 | _Link to hardhat/javascript video with more full-stack examples: https://github.com/smartcontractkit/full-blockchain-solidity-course-js_
850 |
851 | 💻 Code: https://github.com/PatrickAlphaC/defi-stake-yield-brownie-freecode
852 |
853 | - [FreeCodeCamp React](https://www.freecodecamp.org/news/tag/react/)
854 | - What are we building?
855 | - Setup
856 | - `DappToken.sol`
857 | - `TokenFarm.sol`
858 | - `tokenIsAllowed`
859 | - `addAllowedTokens`
860 | - mapping of a mapping
861 | - `stakeTokens`
862 | - `issueTokens`
863 | - `getUserTotalValue`
864 | - `getUserSingleTokenValue`
865 | - `getTokenValue`
866 | - `setPriceFeedContract`
867 | - `unStakeTokens`
868 | - Can this be reentrancy attacked?
869 |
870 | ### Defi Stake Yield Brownie Scripts & Tests
871 |
872 | - `deploy.py`
873 | - Deploying DappToken
874 | - Deploying TokenFarm
875 | - Adding allowed tokens
876 | - [ERC20 Kovan Faucet](https://erc20faucet.com/)
877 | - If the link above does not work, you can get another ERC20 token using this faucet: [Weenus ERC20 Faucet](https://github.com/bokkypoobah/WeenusTokenFaucet)
878 | - Mocking our ERC20s
879 |
880 | ### Testing our Defi Stake Yield Brownie Dapp
881 |
882 | - `test_set_price_feed_contract`
883 | - `test_stake_tokens`
884 | - Fixtures
885 | - `test_issue_tokens`
886 | - Now you try on tests!
887 |
888 | ### Front End / Full Stack
889 |
890 | - Front End Introduction
891 | - Typescript
892 | - [React](https://reactjs.org/)
893 | - [useDapp](https://usedapp.readthedocs.io/en/latest/)
894 | - [npx](https://www.npmjs.com/package/npx)
895 | - [yarn](https://classic.yarnpkg.com/en/docs/install/)
896 | - `create-react-app`
897 | - Layout
898 | - [Testing Front End](https://www.freecodecamp.org/news/testing-react-hooks/)
899 | - yarn && yarn start
900 | - Connecting our wallets
901 | - Install useDapp
902 | - Header Component
903 | - Connect Button
904 | - [Material-UI](https://material-ui.com/)
905 | - Making our button nicer
906 | - `Main.tsx`
907 | - Sending `brownie-config` & `build` folder to our UI
908 | - Helper Config
909 | - TypeScript error suppression
910 | - Getting addresses
911 | - [Ethers](https://docs.ethers.io/v5/)
912 | - Only support kovan
913 | - `YourWallet`
914 | - `supportedTokens`
915 | - State Hooks
916 | - Showing tokens
917 | - `WalletBalance`
918 | - [`ethersproject/units`](https://www.npmjs.com/package/@ethersproject/units)
919 | - `BalanceMsg`
920 | - Stake Form
921 | - Calling `approve`
922 | - `useContractFunction`
923 | - `useEffect`
924 | - Notifications
925 | - Make it pretty
926 | - Alerts
927 |
928 | Shoutout to [Matt](https://twitter.com/mdurkin92) for the help on the front end!
929 |
930 | # Closing and Summary
931 |
932 | ## Security
933 |
934 | - [Best Practices](https://consensys.github.io/smart-contract-best-practices/)
935 | - [Attacks](https://consensys.github.io/smart-contract-best-practices/attacks/)
936 | - [Oracle Attacks](https://hackernoon.com/how-dollar100m-got-stolen-from-defi-in-2021-price-oracle-manipulation-and-flash-loan-attacks-explained-3n6q33r1)
937 | - [Re-entrancy Attacks](https://quantstamp.com/blog/what-is-a-re-entrancy-attack)
938 | - [Damn Vulnerable Defi](https://www.damnvulnerabledefi.xyz/)
939 | - [Ethernaut](https://ethernaut.openzeppelin.com/)
940 | - Some Auditors
941 | - [OpenZeppelin](https://openzeppelin.com/)
942 | - [SigmaPrime](https://sigmaprime.io/)
943 | - [Trail of Bits](https://www.trailofbits.com/)
944 |
945 | ## Where do I go now?
946 |
947 | ### Learning More
948 |
949 | - [CryptoZombies](https://cryptozombies.io/)
950 | - [Dapp University](https://www.youtube.com/channel/UCY0xL8V6NzzFcwzHCgB8orQ)
951 | - [ChainShot](https://www.chainshot.com/courses)
952 | - [Ivan on Tech](https://academy.ivanontech.com/)
953 | - [Eat the Blocks](https://www.youtube.com/channel/UCZM8XQjNOyG2ElPpEUtNasA)
954 | - [Patrick Collins](https://www.youtube.com/channel/UCn-3f8tw_E1jZvhuHatROwA)
955 | - [Austin Griffith](https://www.youtube.com/channel/UC_HI2i2peo1A-STdG22GFsA)
956 | - [Nader Dabit](https://www.youtube.com/user/boyindasouth)
957 | - [Ethereum.org](https://ethereum.org/en/)
958 |
959 | ### Community
960 |
961 | - Twitter
962 | - [Brownie Discord](https://discord.gg/9zk7snTfWe)
963 | - [Ethereum Discord](https://ethereum.org/en/)
964 | - [Chainlink Discord](https://discord.gg/2YHSAey)
965 | - [Reddit ethdev](https://www.reddit.com/r/ethdev/)
966 |
967 | ### Hackathons
968 |
969 | - [CL Hackathon](https://chain.link/hackathon)
970 | - [ETH Global](https://ethglobal.co/)
971 | - [ETH India](https://twitter.com/ETHIndiaco)
972 |
973 | Be sure to check out project grant programs!
974 |
975 | ### Vyper
976 |
977 | [From solidity course to vyper](https://github.com/chalex-eth/From-solidity-course-to-vyper-py)
978 |
979 | And make today an amazing day!
980 |
--------------------------------------------------------------------------------
/chronological-issues-from-video.md:
--------------------------------------------------------------------------------
1 | # About
2 |
3 | This file will list issues/updates by timestamp. If you have an issue that you don't see here, please make an issue on this repo.
4 |
5 | ## Faucet Issues
6 | - If you have any issues with a faucet, please try another testnet. You'll have to update some contract addresses based on the testnet you're working on. You can find the [most up to date faucets here.](https://docs.chain.link/docs/link-token-contracts/)
7 | - If the Rinkeby faucet isn't working, you can use a kovan faucet, just be sure to use Kovan Etherscan and Kovan in your Metamask!
8 | - *Big Update*: [New Rinkeby Faucet Located Here](https://faucets.chain.link/rinkeby)
9 | - You can find [Backup Faucets here](https://docs.chain.link/docs/link-token-contracts/#rinkeby)
10 |
11 | ## Linting issues
12 |
13 | If you see something along the lines of:
14 |
15 | ```
16 | ParserError: Source "OpenZeppelin/openzeppelin-contracts@3.4.0/contracts/access/Ownable.sol" not found: File not found.
17 | import "@openzeppelin/contracts/access/Ownable.sol";
18 | ```
19 |
20 | In your vscode, these and be safely ignored. However you can also add to your settings to ignore these.
21 | 1. Create a `.vscode` folder at the root of your project.
22 | 2. Create a file called `settings.json`
23 | 3. Add the following code:
24 |
25 | ```json
26 | {
27 | "solidity.remappings": [
28 | "@chainlink/=/Users/patrick/.brownie/packages/smartcontractkit/chainlink-brownie-contracts@0.2.2",
29 | "@openzeppelin/=/Users/patrick/.brownie/packages/OpenZeppelin/openzeppelin-contracts@4.3.2"
30 | ]
31 | }
32 | ```
33 |
34 |
35 | Or whatever version your `@chainlink` and `@openzeppelin` contracts need. For example:
36 | 
37 |
38 | **Note:** remember this is an example, you must provide the actual location on which your `.brownie` folder is located. For more info on on this please refer [here](https://n4n0b1t3.medium.com/how-to-make-vsc-solidity-lint-recognize-your-chainlink-and-openzeppelin-libraries-73775129261c).
39 |
40 | ## Integration Testing Issues
41 | - In some integration tests, we do something like `time.sleep(60)`. Sometimes, you'll have to do much longer, we've had reports go up to `time.sleep(300)`. So, if you want to try that, go get a coffee break while your integration test runs!
42 |
43 | ## Python related issues
44 | - In some environments Web3.py may not work due to the **Cytools** error, which means your computer lacks some `C` language libraries in order to execute.
45 |
46 | [Here](https://medium.com/@cromewar/the-mighty-cytools-error-at-web3-smart-contract-development-with-brownie-63335d50f230) you can find a detailed guide about how to solve the problem.
47 |
48 |
49 | ## Lesson 3:
50 | - [2:37:05](https://youtu.be/M576WGiDBdQ?t=9425) Kovan vs Rinkeby
51 | - Our `FundMe.sol` needs to be deployed to the *rinkeby* chain to work, but if you go to try the price feeds from the Chainlink docs using the remix link, that one has the *kovan* price feeds in it, so needs to be deployed to kovan.
52 | - If you want to test the price feeds from the video using the Chainlink docs remix link, you'll need to follow the steps to [get kovan ETH](https://docs.chain.link/docs/link-token-contracts/#kovan).
53 |
54 | ## Lesson 4:
55 | - [3:43:52](https://youtu.be/M576WGiDBdQ?t=13432) Installing solcx version 0.6.0
56 | - In the video, we forgot to do 2 things in order to compile our solidity code:
57 | - Import `install_solc`, so we need to change this line:
58 | - `from solcx import compile_standard`
59 | - To this line:
60 | - `from solcx import compile_standard, install_solc`
61 | - And then, we need to add a line right before we run the `compile_standard` code:
62 | - `install_solc("0.6.0")`
63 | - [4:00:00](https://www.youtube.com/watch?v=M576WGiDBdQ&t=14423s) Issue with ganache and web3.py
64 | - As of `5.25.0` of [web3.py](https://github.com/ethereum/web3.py/tags), we now need to add gasPrice to our transactions with a local ganache chain.
65 | - Adding `"gasPrice": w3.eth.gas_price,` should fix your issue in the transactions.
66 |
67 | Full Example:
68 | ```python
69 | transaction = SimpleStorage.constructor().buildTransaction(
70 | {
71 | "chainId": chain_id,
72 | "gasPrice": w3.eth.gas_price,
73 | "from": my_address,
74 | "nonce": nonce,
75 | }
76 | )
77 | ```
78 | - [3:56:20](https://youtu.be/M576WGiDBdQ?t=13372) Colorized Brackets.
79 | * The referenced extension has been deprecated due to VS code adding native functionality. To enable the new setting search for `bracket` and check the checkbox below:
80 | `Editor > Bracket Pair Colorization:` **Enabled**
81 |
82 | 
83 |
84 | - [3:55:09](https://youtu.be/M576WGiDBdQ?t=14109) Confusing network ID and chain ID
85 | - In the video the network ID is copied instead of the chain id.
86 | Whenever the terms Network ID and Chain ID are used without distinction, it should be noted that both IDs can be different for a server such as Ganache. As you can see here, Ganache can be using different IDs.
87 |
88 | ```
89 | >>> from web3 import Web3
90 | >>> w3 = Web3(Web3.HTTPProvider("http://127.0.0.1:8545"))
91 | >>> w3.eth.chain_id
92 | 1337
93 | >>> w3.net.version
94 | '5777'
95 | >>>
96 | ```
97 |
98 |
99 | ## Lesson 6
100 | - [5:44:00](https://youtu.be/M576WGiDBdQ?t=20640)
101 | - In the video, the getEntranceFee() function returns `(minimumUSD * precision) / price`
102 | - Integer divisions are rounded towards 0 in Solidity, so this function will almost always return an amount worth slightly less than our minimum price. It makes it unusable with the fund() function because the transaction will revert everytime.
103 | - To fix it we can round up the result
104 | - getEntranceFee() function should return `((minimumUSD * precision) / price) + 1`
105 | - This fix has been [merged](https://github.com/PatrickAlphaC/brownie_fund_me/pull/32/files) and you can read more explanation about the issue [here](https://github.com/PatrickAlphaC/brownie_fund_me/issues/10#issuecomment-1041602057)
106 |
107 | ## Lesson 7
108 | **In the video, we use Chainlink VRF v1 and the documentation has been updated to V2. You can view the [V1 documentation here](https://docs.chain.link/docs/get-a-random-number/v1/)**
109 |
110 | - Looking for the VRF Coordinator contract by yourself will probably bring you to the v2 address of it. Make sure to use the v1 VRF Coordinator contract in the brownie-config.yaml file, because it won't work with the v2 contract. The repository has already the correct contract address.
111 |
112 | - [8:06:54ish](https://youtu.be/M576WGiDBdQ?t=29214)
113 | - In the video, we use events exclusivly to test our contracts, however, we could have also used `tx.return_value` to get the return value of a function.
114 | - However, it's still best practice to learn how to use events, especially when updating mappings!
115 |
116 | - [8:10:20ish](https://youtu.be/M576WGiDBdQ?t=29423)
117 | - In the video, `starting_balance_of_account` and `balance_of_lottery` are retrieved AFTER `lottery.endLottery()`
118 | - For correctness those 2 statements should be run BEFORE `lottery.endLottery()`
119 | - The tests pass because `starting_balance_of_account == account.balance()` (L81) and `lottery.balance()` is already 0
120 | - This is a subtle bug in the test, which also showcases a problem with tests - we have no one to test the tests ;) Still, having tests is better than not having them, just don't put all your assurances into them
121 |
122 |
123 | ## Lesson 10
124 | - The Aave testnet site has moved from `https://testnet.aave.com` to `https://staging.aave.com` and some of the functionality is lost :(
125 | - For our `repay_all` function, we originally had:
126 | ```python
127 | repay_all(AMOUNT, lending_pool, account)
128 | ```
129 |
130 | But it should be:
131 |
132 | ```
133 | repay_all(Web3.toWei(amount_dai_to_borrow, "ether"), lending_pool, account)
134 | ```
135 | We want to pay back the DAI not the ETH! Just remember, you'll still have a vveerrrryyyy small amount of DAI borrowed because of interest. If you see something with an `E` in it, you did it right!
136 |
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