40b7690a58
* Add rounding specification for deposit / withdraw The fuzzing test was improved to make sure that the value of pool tokens (minus fees) never changed, which revealed a calc bug with deposits and withdrawals. If someone withdraws, they can take additional small value out of the pool in the form of truncated value. Before, deposit and withdrawal used the same calculation, rounding up the token A and B amounts. Remember that deposit / withdrawal specify the pool token amount, and calculate the amount of A / B required to get to that many pool tokens. On withdrawal, we were giving back a little bit too much. The concept is that everything would even out since a deposit is required for a withdrawal, which makes everything a wash. Fuzzing found this issue very quickly! The change is to introduce a rounding parameter to avoid ever giving away too much value, either during deposit or withdrawal. * Cleanup * Add withdraw test * Cleanup * Cargo fmt * Remove curve tests from fuzzing cfg * Update JS test * Cleanup test * Update honggfuzz again * Fix fee on JS test * Force correct version of honggfuzz for CI (remove later) * Improve value tests using PreciseNumber everywhere * Fix ceiling * Add comment for 0 tokens * Fix ceiling div, add in constant price calc * Revert ceiling division as template and use trait, too much boilerplate * Run cargo fmt |
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| README.md | ||
README.md
Token-swap program
A Uniswap-like exchange for the Token program on the Solana blockchain.
Full documentation is available at https://spl.solana.com/token-swap
JavaScript binding are available in the ./js directory.