# Dutch Auction (Native) This program will create a Dutch auction. Seller sells token on a Dutch auction. Price of the token decreases linearly over time. Auction ends when a buyer buys. Complete all tasks below - Implement the Dutch auction program - Test locally with LiteSVM - Deploy locally to `solana-test-validator` and test with Rust script *** Hint *** See [`instructions/lib.rs`](https://github.com/Cyfrin/solana-course/blob/main/apps/auction/native/exercise/src/instructions/lib.rs) for token helpers. # Task 1 - Implement [`instructions::init`](https://github.com/Cyfrin/solana-course/blob/main/apps/auction/native/exercise/src/instructions/init.rs) - Check seller is signer - Check that `auction_pda` matches expected PDA - Check that `auction_sell_ata` - Check that `seller_sell_ata` - Check that sell token != buy token - Check that `start_price` >= `end_price` - Check that `now` <= `start_time` < `end_time` - Check `sell_amt` > 0 - Create PDA account to store `Auction` state - Create an associated token account for `auction_pda` to store `mint_sell` transferred from the seller. - Send sell token to `auction_sell_ata` (associated token account of `auction_pda`) - Store `Auction` state # Task 2 - Implement [`instructions::buy`](https://github.com/Cyfrin/solana-course/blob/main/apps/auction/native/exercise/src/instructions/buy.rs) - Check buyer is signer - Check that `auction_pda` matches expected PDA - Check that `auction_sell_ata` matches calculated account - Check that `buyer_sell_ata` matches calculated account - Check that `buyer_buy_ata` matches calculated account - Check that `seller_buy_ata` matches calculated account - Check that auction has started - Check that auction has not ended - Calculate the current price - Check current price is greater than or equal to `end_price` - Check current price is less than or equal to `max_price` - Calculate amount of buy token to send to seller - Send buy token to seller - Send sell token to buyer - Close `auction_sell_ata` - Close `auction_pda` # Task 3 - Implement [`instructions::cancel`](https://github.com/Cyfrin/solana-course/blob/main/apps/auction/native/exercise/src/instructions/cancel.rs) - Check seller is signer - Check that `auction_pda` matches expected PDA - Check that `auction_sell_ata` matches calculated account - Check that `buyer_sell_ata` matches calculated account - Get sell amount locked in `auction_sell_ata` - Send sell token to seller - Close `auction_sell_ata` - Close `auction_pda` # Build ```shell cargo build-sbf ``` # Test ```shell cargo test -- --nocapture ``` # Test with script Run local validator ```shell solana config set -ul solana-test-validator ``` Deploy program ```shell solana program deploy ./target/deploy/auction.so ``` Execute demo script ```shell PROGRAM_ID=your program ID RPC=http://localhost:8899 KEYPAIR=path to key pair cargo run --example demo $KEYPAIR $RPC $PROGRAM_ID ```