README.md

60-days-of-solana

My attempt at learning Solana program (smart contract) development through RareSkill's Solana course.

Originally, I was trying to create a single anchor project and add the daily exercises under programs (programs/day_1, programs/day_2, programs/day_x), but this made following along with the tutorial harder (longer running tests, Anchor not supporting deployment/testing of individual programs out of the box).

Directory

• Day 1: Hello World (and troubleshooting Solana installation)
• Day 2: Function arguments, math, and arithmetic overflow
• Day 3: Anchor function magic and the Interface Definition Language
• Day 4: Solana reverts, errors, and basic access control
• Day 5: Where is the constructor? About anchor deploy
• Day 6: Solidity Translations to Rust and Solana
• Day 7: The unusual syntax of Rust
• Day 8: Understanding function-like macros in Rust
• Day 9: Rust Structs and Attribute-like and Custom Derive Macros
• Day 10: Translating Solidity function visibility and contract inheritance to Solana
• Day 11: Block variables in Solana: block.timestamp and block.number and others
• Day 12: Beyond the block: Sysvars
• Day 13: Native Programs: Sysvars
• Day 14: tx.origin, msg.sender, and onlyOwner in Solana
• Day 15: Transaction fees and compute units
• Day 16: Accounts in Solana
• Day 17: Writing to storage
• Day 18: Reading Accounts from Typescript — an alternative to public variables and view functions
• Day 19: Creating mappings and nested mappings in Solana
• Day 20: Cost of storage, maximum storage size, and account resizing
• Day 21: Reading an account balance in Rust: address(account).balance in Solana
• Day 22: More differences: modifiers, view pure, payable, and fallback in Solana
• Day 23: Building a payment splitter: “payable” and “msg.value” in Solana
• Day 24: Authorizing various wallets to write to an account: "Pranking tx.origin"
• Day 25: PDA vs Keypair Accounts
• Day 26: Understanding Account Ownership in Solana: Transferring SOL out of a PDA
• Day 27: init_if_needed and the Reinitialization Attack
• Day 28: Multicall in Solana: Batching Transactions
• Day 29: Owner vs Authority
• Day 30: Deleting Accounts and Closing Programs

Setup

For the initial setup of dependencies required for Solana program development, follow the day 1 tutorial.

Then for creating a new Anchor project:

1. Initialize a project: anchor init day_x
2. Go to folder: cd day_x
3. Remove git repository: rm -rf .git (since 60-days-of-solana is the main git repository)
4. Follow the tutorial for each day

Troubleshooting

Here is a list of common issues that I've encountered while going through the tutorials and how to resolve them.

• Error: Deploying program failed: RPC response error -32002: Transaction simulation failed: Error processing Instruction 0: account data too small for instruction

  • StackOverflow

  To resolve this:

  1. Delete day_x/target/deploy
  2. Build Anchor program: anchor build
  3. Sync keys: anchor keys sync
  4. Redeploy or retest: anchor deploy or anchor test

• error: package solana-program v1.18.0 cannot be built because it requires rustc 1.72.0 or newer, while the currently active rustc version is 1.68.0-dev

• error: package solana-program v1.18.8 cannot be built because it requires rustc 1.75.0 or newer, while the currently active rustc version is 1.72.0-dev

References

• RareSkill's Solana course
• Solana
• What are Solana Programs?
• Anchor