jamland/Build with Anchor on Solana.md

## Build with Anchor on Solana.md

      
    Raw
  

              Build with Anchor on Solana.md
            
          
    CLI

Run local network on M1
solana config set --url localhost
solana-test-validator --no-bpf-jit

Create App

anchor init my-app

Build & Deploy

# Compiles your program.
anchor build

# Deploys your compiled program.
anchor deploy
Other

Get rent for storing 1376 bytes
solana rent 1376

Settings

Update your program ID
solana address -k target/deploy/solana_twitter-keypair.json
# Outputs something like: 2EKFZUwMrNdo8YLRHn3CyZa98zp6WH7Zpg16qYGU7htD

# Anchor.toml
[programs.localnet]
solana_twitter = "2EKFZUwMrNdo8YLRHn3CyZa98zp6WH7Zpg16qYGU7htD"

# programs/solana-twitter/src/lib.rs
declare_id!("2EKFZUwMrNdo8YLRHn3CyZa98zp6WH7Zpg16qYGU7htD");

anchor build
anchor deploy

Code

Account constraints

https://docs.rs/anchor-lang/0.18.2/anchor_lang/derive.Accounts.html
use anchor_lang::solana_program::system_program;

#[derive(Accounts)]
pub struct SendTweet<'info> {
    #[account(init, payer = author, space = Tweet::LEN)]
    pub tweet: Account<'info, Tweet>,
    #[account(mut)]
    pub author: Signer<'info>,
    #[account(address = system_program::ID)]
    pub system_program: AccountInfo<'info>,
}

Guarding against invalid data

if topic.chars().count() > 50 {
    return Err(ErrorCode::TopicTooLong.into());
}

#[error]
pub enum ErrorCode {
    #[msg("The provided topic should be 50 chars long maximum.")]
    TopicTooLong,
}


Tests


Provider settings set in Anchor.toml
[provider]
cluster = "localnet"
wallet = "/Users/andy/.config/solana/id.json"

Run test

anchor run test

anchor test

anchor test is equivalent of
# Start the local ledger.
solana-test-validator

# Then, on a separate terminal session.
anchor build
anchor deploy
anchor run test


Local network should be down

'anchor localnet`

anchor localnet is equivalent of
solana-test-validator --reset
anchor build
anchor deploy

# The local ledger will stay active after deployment.