betting

A Rust crate to manage twitch-style bets (aka Parimutuel betting)

```rust use bets::{Bets, BetError, Amount};

fn betdemo() -> Result<(), BetError> { // variables for readability let serverid = 1; let betid = 1; let (alice, bob, charlie) = (0, 1, 2); // Create the database let bets = Bets::new("bets.db")?; // Create 3 accounts on server 1 with 100 starting coins bets.createaccount(serverid, alice, 100)?; bets.createaccount(serverid, bob, 100)?; bets.createaccount(serverid, charlie, 100)?; // Alice creates a bet with 2 outcomes bets.createbet( betid, serverid, alice, "Who will win the Rocket League 1v1 ?", &vec!["Alice", "Bob"], )?; // Alice bets on herself (outcome with id 0) with 10 coins bets.beton(betid, 0, alice, 10)?; // Bob bets on himself (outcome with id 1) with 40 coins bets.beton(betid, 1, bob, 40)?; // Charlie bets on Alice with half of his coins (50) bets.beton(betid, 0, charlie, 0.5)?; // asserts that the money is gone from their accounts asserteq!(bets.balance(serverid, alice)?, 90); asserteq!(bets.balance(serverid, bob)?, 60); asserteq!(bets.balance(serverid, charlie)?, 50); // lock the bet bets.lockbet(betid)?; // ... // Rocket league 1v1 occurs // ... // Alice ended up winning ! we resolve the bet with outcome of id 0 bets.resolve(betid, 0)?; // The winning side gets 10 + 40 + 50 = 100 coins // split proportionally among the betters // Alice had bet 10 out of 60 of this outcome, she wins 100*(10/60) = 16.6 rounded to 17 asserteq!(bets.balance(serverid, alice)?, 107); // Bob doesn't win anything since he bet on the wrong outcome asserteq!(bets.balance(serverid, bob)?, 60); // Charlie had bet 50 out of 60 of this outcome, he wins 100*(50/60) = 83.3 rounded to 83 asserteq!(bets.balance(server_id, charlie)?, 133); Ok(()) }

fn main() { if let Err(why) = bet_demo() { println!("{:?}", why); } } ```