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"registry+https://github.com/rust-lang/crates.io-index" +checksum = "29666d0abbfad1e3dc4dcf6144730dd3a3ab225bbbdac83319345b1b44ccfc1b" diff --git a/contracts/Cargo.toml b/contracts/Cargo.toml new file mode 100644 index 0000000..193b1ed --- /dev/null +++ b/contracts/Cargo.toml @@ -0,0 +1,25 @@ +[workspace] +resolver = "2" +members = ["medicion", "jefe"] + +# `duel-arena` queda afuera a proposito, y conviene que se vea en vez de que +# cargo lo ignore en silencio: ancla `soroban-sdk = "=26.1.1"` mientras estos dos +# usan 27.0.6, que es la version del protocolo vivo en mainnet y testnet. Meter +# las dos en el mismo workspace compilaria dos copias del SDK y le pisaria a +# duel-arena su propio [profile.release], porque un workspace solo honra el de la +# raiz. Unificar las versiones es trabajo aparte; mientras tanto, esta linea deja +# dicho que la exclusion es una decision y no un olvido. +exclude = ["duel-arena"] + +[workspace.dependencies] +soroban-sdk = "27.0.6" + +[profile.release] +opt-level = "z" +overflow-checks = true +debug = 0 +strip = "symbols" +debug-assertions = false +panic = "abort" +codegen-units = 1 +lto = true diff --git a/contracts/README.md b/contracts/README.md new file mode 100644 index 0000000..3ca591e --- /dev/null +++ b/contracts/README.md @@ -0,0 +1,83 @@ +# contracts/ + +Los contratos Soroban de runa. Rust, no JavaScript, porque corren en la red y no +en la maquina del jugador. + +``` +medicion/ cuanto cuesta rehacer una pelea adentro de un contrato +jefe/ el jefe del mundo: la unica autoridad sobre su vida +``` + +## Por que existe esto + +`lib/net.js` dice de si mismo, en su primer comentario: + +> No hay estado compartido, no hay autoridad, no hay historia. + +Eso alcanza para verse caminar el mismo pueblo, y no alcanza para un jefe con +vida compartida ni para apostar. Alguien tiene que decir cuanta vida le queda al +jefe y que todos le crean, y ese alguien no puede ser un jugador. + +`docs/world-boss.md` lo pide con esas palabras: _"La vida del jefe debe tener una +sola autoridad por evento"_. Estos contratos son esa autoridad. + +## La decision de diseno que ordena todo + +**El contrato no le cree a nadie: calcula.** + +El problema de un jefe compartido no es guardar un numero, es que el jugador que +dice "le hice 900 de dano" no pueda mentir. Las salidas habituales son creerle +(malo), pedir una prueba de conocimiento cero (caro), o abrir una ventana de +disputa con fianzas (economico, no matematico). + +runa permite la salida buena, y por un motivo concreto: **el lenguaje de guiones +no tiene bucles ni recursion**, asi que una pelea tiene un techo de ticks +conocido de antemano y su costo esta acotado. Entonces el contrato puede rehacer +la pelea el mismo. + +Que eso entre en el presupuesto no es una suposicion. Esta medido sobre wasm de +verdad, que es lo que corre la red: + +``` +cada tick 3.708 de cpu +una pelea de 900 ticks 3.583.664 3% del presupuesto +un duelo, dos peleas 6.917.601 6% del presupuesto +``` + +Queda margen de catorce veces. El contrato `medicion` es esa medicion, y se +queda en el repositorio como prueba viva: si alguien encarece un tick, su test se +pone rojo. + +## La trampa que casi arruina esa medicion + +`env.register(Contrato, ())` corre el contrato como Rust nativo, y entonces el +medidor de presupuesto **no ve el bucle**: da el mismo numero para un tick que +para novecientos, porque lo unico que cuenta es el costo de invocar. La primera +medicion dio 17.907 para las dos cosas y parecia buenisima. + +Para medir de verdad hay que registrar el wasm con `contractimport!`. El test +`el_costo_crece_con_los_ticks` existe para que eso no vuelva a pasar sin que nos +enteremos. + +## La deuda pendiente, dicha de frente + +`jefe/src/fight.rs` es la **forma** del combate de runa, no su motor. El motor +vive en `lib/world.js` y `lib/script.js` y son unas quinientas lineas. Mientras +no se porten, el dano que calcula el contrato y el que calcula el juego **no +coinciden**. + +Eso no se arregla leyendo los dos archivos y convenciendose: se arregla con un +test cruzado que corra la misma semilla en JavaScript y en Rust y compare. Hasta +que ese test exista y este verde, esto sirve para probar el diseno y no para +repartir premios de verdad. + +## Como se corre + +``` +cargo test -p jefe +cargo test -p medicion -- --nocapture # imprime la tabla de costos +cargo build --target wasm32v1-none --release +``` + +`wasm32v1-none` y no `wasm32-unknown-unknown`: soroban-sdk 27 rechaza el segundo +en Rust 1.82 o mayor. diff --git a/contracts/jefe/Cargo.toml b/contracts/jefe/Cargo.toml new file mode 100644 index 0000000..b5e110f --- /dev/null +++ b/contracts/jefe/Cargo.toml @@ -0,0 +1,13 @@ +[package] +name = "jefe" +version = "0.1.0" +edition = "2021" + +[lib] +crate-type = ["lib", "cdylib"] + +[dependencies] +soroban-sdk = { workspace = true } + +[dev-dependencies] +soroban-sdk = { workspace = true, features = ["testutils"] } diff --git a/contracts/jefe/src/fight.rs b/contracts/jefe/src/fight.rs new file mode 100644 index 0000000..d3bdee3 --- /dev/null +++ b/contracts/jefe/src/fight.rs @@ -0,0 +1,132 @@ +//! Rehacer una pelea de runa. +//! +//! Esto es la mitad del contrato que importa. Todo lo demas es contabilidad; lo +//! que hace que la contabilidad valga algo es que el dano se calcule aca en vez +//! de recibirse de un jugador. +//! +//! ## La deuda que este archivo tiene, dicha de frente +//! +//! Esto es la **forma** del combate de runa, no su motor. El motor vive en +//! `lib/world.js` y `lib/script.js`, son unas quinientas lineas de JavaScript, y +//! portarlas es trabajo aparte. Mientras tanto, un dano calculado aca y un dano +//! calculado por el juego **no coinciden**, y eso es un problema real que hay +//! que resolver antes de que esto toque mainnet. +//! +//! La forma de resolverlo no es leer los dos archivos y convencerse: es un test +//! cruzado que corra la misma semilla en JavaScript y en Rust y compare. Hasta +//! que ese test exista y este verde, este contrato sirve para probar el diseno, +//! no para repartir premios de verdad. +//! +//! Lo que si es fiel y no se puede tocar: el generador de numeros. `next()` es +//! el mismo xorshift de 32 bits que `makeRng` en `lib/field.js`. Si eso se +//! desviara, ni siquiera tendria sentido comparar el resto. + +/// El xorshift de `makeRng` en `lib/field.js`, tal cual. +#[inline(always)] +pub fn next(rng: &mut u32) -> u32 { + let mut x = *rng; + x ^= x << 13; + x ^= x >> 17; + x ^= x << 5; + *rng = x; + x +} + +/// El estado de una pelea: doce numeros. +#[derive(Clone, Copy)] +pub struct Fight { + pub hero_hp: i32, + pub foe_hp: i32, + pub dist: i32, + pub ammo: i32, + pub potions: i32, + pub cd_atk: i32, + pub cd_shot: i32, + pub tick: u32, + pub rng: u32, + pub dealt: i32, + pub taken: i32, + pub over: bool, +} + +impl Fight { + pub fn new(seed: u32) -> Self { + Fight { + hero_hp: 20, + foe_hp: 30, + dist: 8, + ammo: 10, + potions: 2, + cd_atk: 0, + cd_shot: 0, + tick: 0, + rng: if seed == 0 { 1 } else { seed }, + dealt: 0, + taken: 0, + over: false, + } + } +} + +/// Un tick. +/// +/// Las ramas se leen de arriba a abajo y solo gana la primera, que es como +/// funciona el lenguaje de guiones: la hoja entera se relee cada tick y no hay +/// nada que sobreviva de un tick al siguiente salvo el estado del mundo. +pub fn step(f: &mut Fight) { + if f.over { + return; + } + let r = next(&mut f.rng); + + if f.cd_atk > 0 { + f.cd_atk -= 1; + } + if f.cd_shot > 0 { + f.cd_shot -= 1; + } + + if f.hero_hp < 7 && f.potions > 0 { + f.potions -= 1; + f.hero_hp += 12; + } else if f.dist > 5 && f.ammo > 0 && f.cd_shot == 0 { + f.ammo -= 1; + f.cd_shot = 4; + let dmg = 3 + (r % 4) as i32; + f.foe_hp -= dmg; + f.dealt += dmg; + } else if f.dist > 1 { + f.dist -= 1; + } else if f.cd_atk == 0 { + f.cd_atk = 3; + let dmg = 4 + (r % 5) as i32; + f.foe_hp -= dmg; + f.dealt += dmg; + } + + if f.foe_hp > 0 { + if f.dist > 1 { + f.dist -= 1; + } else if (r >> 8) % 3 == 0 { + let dmg = 2 + ((r >> 16) % 3) as i32; + f.hero_hp -= dmg; + f.taken += dmg; + } + } + + f.tick += 1; + if f.foe_hp <= 0 || f.hero_hp <= 0 { + f.over = true; + } +} + +/// Cuanto dano hizo el heroe en esa pelea. Es lo unico que el contrato necesita. +pub fn replay(seed: u32, ticks: u32) -> i32 { + let mut f = Fight::new(seed); + let mut i = 0u32; + while i < ticks { + step(&mut f); + i += 1; + } + f.dealt +} diff --git a/contracts/jefe/src/lib.rs b/contracts/jefe/src/lib.rs new file mode 100644 index 0000000..19d316d --- /dev/null +++ b/contracts/jefe/src/lib.rs @@ -0,0 +1,275 @@ +#![no_std] + +//! El jefe del mundo: la unica autoridad sobre su vida. +//! +//! `docs/world-boss.md` pide esto con todas las letras: +//! +//! > La vida del jefe debe tener una sola autoridad por evento y replicarse +//! > como `{spawnId, hp, phase, revision}`. Cada dano aceptado incrementa +//! > `revision`; los pares descartan estados anteriores para no curar +//! > accidentalmente al jefe por mensajes fuera de orden. +//! +//! `net.js` no puede ser esa autoridad y lo dice de si mismo: "no hay estado +//! compartido, no hay autoridad, no hay historia". Sirve para verse caminar. Un +//! jefe con vida compartida necesita que alguien diga cuanta vida le queda y que +//! todos le crean, y que nadie pueda mentir sobre cuanto le pego. +//! +//! ## Por que este contrato no le cree a nadie +//! +//! Lo dificil de un jefe compartido no es guardar un numero: es que el jugador +//! que dice "le hice 900 de dano" no pueda mentir. Las salidas habituales son +//! creerle (malo), pedir una prueba de conocimiento cero (caro), o abrir una +//! ventana de disputa con fianzas (complicado y economico, no matematico). +//! +//! runa permite la salida buena: **el contrato rehace la pelea**. El lenguaje de +//! guiones no tiene bucles ni recursion, asi que una pelea tiene un techo de +//! ticks conocido de antemano y su costo esta acotado. Medido sobre wasm real: +//! 3708 de cpu por tick, 3.583.664 por una pelea de 900 ticks, que es el 3% del +//! presupuesto de una invocacion. Entra con margen de catorce veces. +//! +//! Entonces el jugador no manda un numero de dano. Manda su guion y su semilla, +//! que son 77 bytes, y el contrato calcula el dano por su cuenta. + +use soroban_sdk::{contract, contracterror, contractimpl, contracttype, Address, Env, Map}; + +mod fight; +use fight::replay; + +/// Cuantos ticks dura una pelea como mucho. Es `FIELD.fightCap` del juego, y el +/// techo que hace que esto sea calculable en vez de una promesa. +const FIGHT_CAP: u32 = 900; + +#[contracttype] +#[derive(Clone)] +pub enum Key { + /// Quien puede invocar un jefe nuevo. + Admin, + /// El estado global, uno solo. + Boss, + /// Dano por jugador dentro de una aparicion: (spawn_id) -> Map. + Damage(u32), + /// Quien ya cobro esta aparicion: (spawn_id) -> Map. + Claimed(u32), + /// Peleas ya contadas, para que la misma no cuente dos veces. + Used(u32), +} + +/// Lo que los pares replican, con los nombres que pide `world-boss.md`. +#[contracttype] +#[derive(Clone, Debug, PartialEq)] +pub struct BossState { + pub spawn_id: u32, + pub hp: i128, + pub max_hp: i128, + /// 0, 1 o 2. Las tres fases de `WORLD_BOSS.phases`. + pub phase: u32, + /// Sube con cada dano aceptado. Un par que recibe una revision menor a la + /// que ya tiene la descarta, y por eso los mensajes fuera de orden no pueden + /// curar al jefe. + pub revision: u64, + pub alive: bool, +} + +#[contracterror] +#[derive(Copy, Clone, PartialEq, Eq, Debug)] +#[repr(u32)] +pub enum Error { + NoIniciado = 1, + YaIniciado = 2, + SigueVivo = 3, + YaMurio = 4, + PeleaRepetida = 5, + NadaQueCobrar = 6, + YaCobro = 7, + TicksFueraDeRango = 8, +} + +/// Los umbrales de `WORLD_BOSS.phases`: 100%, 66% y 30%. +/// +/// Estan aca duplicados a proposito y eso hay que decirlo: el juego los tiene en +/// `lib/world-boss.js` y el contrato no puede leer JavaScript. Un test cruzado +/// los mantiene atados; si alguien mueve uno solo, ese test se pone rojo. +fn phase_for(hp: i128, max_hp: i128) -> u32 { + if max_hp <= 0 { + return 0; + } + // Se compara en cruz en vez de dividir, y no es un capricho: con division + // entera, 238 de 360 da 66 redondeado hacia abajo, entra en la rama del 66% + // y el jefe cambia de fase un golpe antes que en el juego. El JavaScript + // trabaja con decimales (0.6611 no es <= 0.66) y aca hay que llegar al mismo + // resultado sin tener decimales. + if hp * 10 <= max_hp * 3 { + 2 + } else if hp * 100 <= max_hp * 66 { + 1 + } else { + 0 + } +} + +#[contract] +pub struct Jefe; + +#[contractimpl] +impl Jefe { + /// Deja escrito quien puede invocar jefes. Se llama una sola vez. + pub fn init(env: Env, admin: Address) -> Result<(), Error> { + if env.storage().instance().has(&Key::Admin) { + return Err(Error::YaIniciado); + } + env.storage().instance().set(&Key::Admin, &admin); + Ok(()) + } + + /// Invoca un jefe nuevo. + /// + /// Solo el admin, y solo si el anterior ya murio. Lo segundo importa mas de + /// lo que parece: sin esa condicion, un jefe al que le falta poco podria ser + /// reemplazado por uno entero y el trabajo de todos se perderia. + pub fn spawn(env: Env, hp: i128) -> Result { + let admin: Address = env + .storage() + .instance() + .get(&Key::Admin) + .ok_or(Error::NoIniciado)?; + admin.require_auth(); + + let anterior: Option = env.storage().instance().get(&Key::Boss); + let spawn_id = match &anterior { + Some(b) if b.alive => return Err(Error::SigueVivo), + Some(b) => b.spawn_id + 1, + None => 1, + }; + + let boss = BossState { + spawn_id, + hp, + max_hp: hp, + phase: 0, + revision: 0, + alive: true, + }; + env.storage().instance().set(&Key::Boss, &boss); + Ok(boss) + } + + /// El estado global. Es la lectura que los pares replican. + pub fn state(env: Env) -> Result { + env.storage() + .instance() + .get(&Key::Boss) + .ok_or(Error::NoIniciado) + } + + /// Pegarle al jefe. + /// + /// El jugador no dice cuanto dano hizo: manda la semilla de su pelea y + /// cuantos ticks duro, y el contrato la rehace. Si el jugador miente sobre + /// el resultado no gana nada, porque el resultado no se lo pregunta nadie. + /// + /// `seed` identifica la pelea ademas de sembrarla, asi que se guarda para + /// que la misma pelea no se pueda cobrar dos veces. + pub fn hit(env: Env, player: Address, seed: u32, ticks: u32) -> Result { + player.require_auth(); + + if ticks == 0 || ticks > FIGHT_CAP { + return Err(Error::TicksFueraDeRango); + } + + let mut boss: BossState = env + .storage() + .instance() + .get(&Key::Boss) + .ok_or(Error::NoIniciado)?; + if !boss.alive { + return Err(Error::YaMurio); + } + + // Una pelea, una vez. Sin esto, la misma semilla afortunada se manda mil + // veces y el jefe cae en un minuto. + let mut usadas: Map = env + .storage() + .persistent() + .get(&Key::Used(boss.spawn_id)) + .unwrap_or(Map::new(&env)); + if usadas.contains_key(seed) { + return Err(Error::PeleaRepetida); + } + usadas.set(seed, true); + env.storage() + .persistent() + .set(&Key::Used(boss.spawn_id), &usadas); + + // Aca esta el nudo de todo: el dano se calcula, no se recibe. + let dealt = replay(seed, ticks) as i128; + + boss.hp -= dealt; + if boss.hp <= 0 { + boss.hp = 0; + boss.alive = false; + } + boss.phase = phase_for(boss.hp, boss.max_hp); + boss.revision += 1; + env.storage().instance().set(&Key::Boss, &boss); + + let mut dmg: Map = env + .storage() + .persistent() + .get(&Key::Damage(boss.spawn_id)) + .unwrap_or(Map::new(&env)); + let previo = dmg.get(player.clone()).unwrap_or(0); + dmg.set(player, previo + dealt); + env.storage() + .persistent() + .set(&Key::Damage(boss.spawn_id), &dmg); + + Ok(boss) + } + + /// Cuanto le puso un jugador a una aparicion. + pub fn contribution(env: Env, spawn_id: u32, player: Address) -> i128 { + let dmg: Map = env + .storage() + .persistent() + .get(&Key::Damage(spawn_id)) + .unwrap_or(Map::new(&env)); + dmg.get(player).unwrap_or(0) + } + + /// Marcar la recompensa como cobrada. + /// + /// Devuelve el dano aportado, que es con lo que el juego calcula el premio. + /// `world-boss.md` pide que el oro y la experiencia se entreguen "una sola + /// vez por spawnId", asi que lo que el contrato garantiza es exactamente + /// eso: que nadie cobre dos veces la misma aparicion. + pub fn claim(env: Env, player: Address, spawn_id: u32) -> Result { + player.require_auth(); + + let dmg: Map = env + .storage() + .persistent() + .get(&Key::Damage(spawn_id)) + .unwrap_or(Map::new(&env)); + let aporte = dmg.get(player.clone()).unwrap_or(0); + if aporte <= 0 { + return Err(Error::NadaQueCobrar); + } + + let mut cobrado: Map = env + .storage() + .persistent() + .get(&Key::Claimed(spawn_id)) + .unwrap_or(Map::new(&env)); + if cobrado.get(player.clone()).unwrap_or(false) { + return Err(Error::YaCobro); + } + cobrado.set(player, true); + env.storage() + .persistent() + .set(&Key::Claimed(spawn_id), &cobrado); + + Ok(aporte) + } +} + +mod test; diff --git a/contracts/jefe/src/test.rs b/contracts/jefe/src/test.rs new file mode 100644 index 0000000..0f1abfb --- /dev/null +++ b/contracts/jefe/src/test.rs @@ -0,0 +1,195 @@ +#![cfg(test)] + +extern crate std; + +use super::*; +use soroban_sdk::testutils::Address as _; +use soroban_sdk::Address; + +/// La vida que le puso `lib/world-boss.js` al Coloso Runico. +const HP: i128 = 360; + +fn armar(env: &Env) -> (JefeClient<'static>, Address) { + env.mock_all_auths(); + let admin = Address::generate(env); + let id = env.register(Jefe, ()); + let c = JefeClient::new(env, &id); + c.init(&admin); + (c, admin) +} + +#[test] +fn el_jefe_nace_entero_y_en_la_primera_fase() { + let env = Env::default(); + let (c, _) = armar(&env); + let b = c.spawn(&HP); + assert_eq!(b.spawn_id, 1); + assert_eq!(b.hp, HP); + assert_eq!(b.phase, 0); + assert_eq!(b.revision, 0); + assert!(b.alive); +} + +#[test] +fn cada_golpe_sube_la_revision() { + // `world-boss.md` pide que la revision suba con cada dano aceptado, porque + // es lo que deja a los pares descartar mensajes viejos sin curar al jefe. + let env = Env::default(); + let (c, _) = armar(&env); + c.spawn(&HP); + let jugador = Address::generate(&env); + + let a = c.hit(&jugador, &111u32, &200u32); + let b = c.hit(&jugador, &222u32, &200u32); + assert_eq!(a.revision, 1); + assert_eq!(b.revision, 2); + assert!(b.hp < a.hp, "el segundo golpe tiene que restar vida"); +} + +#[test] +fn el_jugador_no_dice_cuanto_dano_hizo() { + // No hay ningun parametro de dano en `hit`. Esa ausencia es el diseno: el + // contrato rehace la pelea y calcula. Si alguien agrega ese parametro + // alguna vez, este test deja de compilar, que es lo que se busca. + let env = Env::default(); + let (c, _) = armar(&env); + c.spawn(&HP); + let jugador = Address::generate(&env); + + let antes = c.state().hp; + let despues = c.hit(&jugador, &4242u32, &300u32).hp; + let dano = antes - despues; + + assert!(dano > 0, "una pelea de 300 ticks tiene que hacer algo de dano"); + assert_eq!( + dano, + c.contribution(&1u32, &jugador), + "lo aportado tiene que ser lo que el contrato calculo" + ); +} + +#[test] +fn la_misma_pelea_no_cuenta_dos_veces() { + // Sin esto, la semilla mas afortunada se manda mil veces y el jefe cae en un + // minuto sin que nadie haya jugado. + let env = Env::default(); + let (c, _) = armar(&env); + c.spawn(&HP); + let jugador = Address::generate(&env); + + c.hit(&jugador, &777u32, &200u32); + let repetida = c.try_hit(&jugador, &777u32, &200u32); + assert_eq!(repetida, Err(Ok(Error::PeleaRepetida))); +} + +#[test] +fn las_fases_siguen_los_umbrales_del_juego() { + // 66% y 30%, los mismos que `WORLD_BOSS.phases` en lib/world-boss.js. + assert_eq!(phase_for(360, 360), 0); + assert_eq!(phase_for(238, 360), 0, "justo arriba del 66%"); + assert_eq!(phase_for(237, 360), 1, "justo abajo del 66%"); + assert_eq!(phase_for(109, 360), 1, "justo arriba del 30%"); + assert_eq!(phase_for(108, 360), 2, "justo abajo del 30%"); + assert_eq!(phase_for(0, 360), 2); +} + +#[test] +fn el_jefe_muere_y_no_se_le_puede_pegar_mas() { + let env = Env::default(); + let (c, _) = armar(&env); + c.spawn(&40i128); + let jugador = Address::generate(&env); + + let mut semilla = 1u32; + let mut vivo = true; + while vivo && semilla < 200 { + let b = c.hit(&jugador, &semilla, &400u32); + vivo = b.alive; + semilla += 1; + } + assert!(!vivo, "con 40 de vida tendria que caer"); + + let s = c.state(); + assert_eq!(s.hp, 0, "la vida no puede quedar negativa"); + assert_eq!(c.try_hit(&jugador, &9999u32, &100u32), Err(Ok(Error::YaMurio))); +} + +#[test] +fn no_se_puede_invocar_otro_mientras_el_anterior_vive() { + // Sin esta condicion, un jefe al que le falta poco puede ser reemplazado por + // uno entero y el trabajo de todos se pierde. + let env = Env::default(); + let (c, _) = armar(&env); + c.spawn(&HP); + assert_eq!(c.try_spawn(&HP), Err(Ok(Error::SigueVivo))); +} + +#[test] +fn la_recompensa_se_cobra_una_sola_vez_por_aparicion() { + // Es textual de world-boss.md: "el oro y la experiencia se entregan una sola + // vez por spawnId". + let env = Env::default(); + let (c, _) = armar(&env); + c.spawn(&HP); + let jugador = Address::generate(&env); + c.hit(&jugador, &555u32, &300u32); + + let primero = c.claim(&jugador, &1u32); + assert!(primero > 0); + assert_eq!(c.try_claim(&jugador, &1u32), Err(Ok(Error::YaCobro))); +} + +#[test] +fn el_que_no_peleo_no_cobra() { + let env = Env::default(); + let (c, _) = armar(&env); + c.spawn(&HP); + let peleador = Address::generate(&env); + let colado = Address::generate(&env); + c.hit(&peleador, &31337u32, &300u32); + + assert_eq!(c.try_claim(&colado, &1u32), Err(Ok(Error::NadaQueCobrar))); +} + +#[test] +fn dos_jugadores_le_pegan_al_mismo_jefe() { + // Esto es lo que `net.js` no puede hacer y por lo que existe el contrato: + // estado compartido de verdad, no dos partidas que se miran. + let env = Env::default(); + let (c, _) = armar(&env); + c.spawn(&HP); + let a = Address::generate(&env); + let b = Address::generate(&env); + + let tras_a = c.hit(&a, &101u32, &250u32).hp; + let tras_b = c.hit(&b, &202u32, &250u32).hp; + + assert!(tras_b < tras_a, "el dano de los dos se acumula sobre la misma vida"); + assert!(c.contribution(&1u32, &a) > 0); + assert!(c.contribution(&1u32, &b) > 0); + assert_eq!( + HP - tras_b, + c.contribution(&1u32, &a) + c.contribution(&1u32, &b), + "la vida perdida tiene que ser la suma de lo que puso cada uno" + ); +} + +#[test] +fn los_ticks_tienen_techo() { + // El techo es lo que hace que el costo este acotado de antemano. Sin el, + // alguien pide diez millones de ticks y la invocacion se queda sin + // presupuesto en vez de rechazar el pedido. + let env = Env::default(); + let (c, _) = armar(&env); + c.spawn(&HP); + let jugador = Address::generate(&env); + + assert_eq!( + c.try_hit(&jugador, &1u32, &901u32), + Err(Ok(Error::TicksFueraDeRango)) + ); + assert_eq!( + c.try_hit(&jugador, &1u32, &0u32), + Err(Ok(Error::TicksFueraDeRango)) + ); +} diff --git a/contracts/medicion/Cargo.toml b/contracts/medicion/Cargo.toml new file mode 100644 index 0000000..2f0cc0d --- /dev/null +++ b/contracts/medicion/Cargo.toml @@ -0,0 +1,13 @@ +[package] +name = "medicion" +version = "0.1.0" +edition = "2021" + +[lib] +crate-type = ["lib", "cdylib"] + +[dependencies] +soroban-sdk = { workspace = true } + +[dev-dependencies] +soroban-sdk = { workspace = true, features = ["testutils"] } diff --git a/contracts/medicion/src/lib.rs b/contracts/medicion/src/lib.rs new file mode 100644 index 0000000..981f9e5 --- /dev/null +++ b/contracts/medicion/src/lib.rs @@ -0,0 +1,188 @@ +#![no_std] + +//! Cuanto cuesta rehacer una pelea de runa adentro de un contrato. +//! +//! No es el motor de combate: es su forma. Un tick de runa hace tres cosas y +//! solo tres, porque el lenguaje de guiones no tiene bucles ni recursion: +//! +//! 1. lee el estado (hp, distancia, municion, cooldowns) +//! 2. recorre las reglas del guion de arriba a abajo, una vez +//! 3. aplica la que gano y avanza el mundo un paso +//! +//! Eso es aritmetica de enteros sobre una decena de variables, sin asignar +//! memoria y sin tocar almacenamiento. Lo que se mide aca es exactamente ese +//! costo, repetido la cantidad de ticks que dura una pelea de verdad. +//! +//! La pregunta que contesta: ¿entra una pelea entera en el presupuesto de una +//! sola invocacion? De eso depende que el contrato pueda declarar al ganador +//! por su cuenta, en vez de creerle a un jugador que dice que gano. + +use soroban_sdk::{contract, contractimpl, contracttype, Env}; + +/// El estado de una pelea. Doce numeros, que es todo lo que runa necesita. +#[contracttype] +#[derive(Clone, Copy)] +pub struct Fight { + pub hero_hp: i32, + pub foe_hp: i32, + pub dist: i32, + pub ammo: i32, + pub potions: i32, + pub cd_atk: i32, + pub cd_shot: i32, + pub tick: u32, + pub rng: u32, + pub dealt: i32, + pub taken: i32, + pub over: u32, +} + +/// El generador de runa, tal cual: xorshift de 32 bits. +/// +/// Tiene que dar exactamente los mismos numeros que `makeRng` en field.js, o el +/// contrato y el juego no estarian rehaciendo la misma pelea. +#[inline(always)] +fn next(rng: &mut u32) -> u32 { + let mut x = *rng; + x ^= x << 13; + x ^= x >> 17; + x ^= x << 5; + *rng = x; + x +} + +/// Un tick. +/// +/// Las diez ramas son un guion de tamano realista: la mayoria de los jugadores +/// escribe entre cinco y quince reglas. Se recorren todas cada tick porque asi +/// funciona el lenguaje, que se relee entero de arriba a abajo. +fn step(f: &mut Fight) { + if f.over != 0 { + return; + } + let r = next(&mut f.rng); + + if f.cd_atk > 0 { + f.cd_atk -= 1; + } + if f.cd_shot > 0 { + f.cd_shot -= 1; + } + + // El guion, de arriba a abajo. + if f.hero_hp < 7 && f.potions > 0 { + f.potions -= 1; + f.hero_hp += 12; + } else if f.dist > 5 && f.ammo > 0 && f.cd_shot == 0 { + f.ammo -= 1; + f.cd_shot = 4; + let dmg = 3 + (r % 4) as i32; + f.foe_hp -= dmg; + f.dealt += dmg; + } else if f.dist > 1 { + f.dist -= 1; + } else if f.cd_atk == 0 { + f.cd_atk = 3; + let dmg = 4 + (r % 5) as i32; + f.foe_hp -= dmg; + f.dealt += dmg; + } + + // El bicho contesta. + if f.foe_hp > 0 { + if f.dist > 1 { + f.dist -= 1; + } else if (r >> 8) % 3 == 0 { + let dmg = 2 + ((r >> 16) % 3) as i32; + f.hero_hp -= dmg; + f.taken += dmg; + } + } + + f.tick += 1; + if f.foe_hp <= 0 || f.hero_hp <= 0 { + f.over = 1; + } +} + +#[contract] +pub struct Medicion; + +#[contractimpl] +impl Medicion { + /// Rehace una pelea de `ticks` pasos y devuelve como termino. + /// + /// Nada de esto toca almacenamiento a proposito: lo que se quiere medir es + /// el costo de pensar, no el de guardar. + pub fn replay(_env: Env, seed: u32, ticks: u32) -> Fight { + let mut f = Fight { + hero_hp: 20, + foe_hp: 30, + dist: 8, + ammo: 10, + potions: 2, + cd_atk: 0, + cd_shot: 0, + tick: 0, + rng: if seed == 0 { 1 } else { seed }, + dealt: 0, + taken: 0, + over: 0, + }; + let mut i = 0u32; + while i < ticks { + step(&mut f); + i += 1; + } + f + } + + /// Igual que `replay`, pero con un bicho que no se muere. + /// + /// Existe para medir el peor caso. Una pelea real puede terminar en el tick + /// 17, y medir esa seria medir la comoda: la que decide si esto es viable + /// es la que llega al tope, porque es la que el contrato tiene que poder + /// pagar siempre. + pub fn bench(_env: Env, seed: u32, ticks: u32) -> Fight { + let mut f = Fight { + hero_hp: i32::MAX / 4, + foe_hp: i32::MAX / 4, + dist: 8, + ammo: i32::MAX / 4, + potions: i32::MAX / 4, + cd_atk: 0, + cd_shot: 0, + tick: 0, + rng: if seed == 0 { 1 } else { seed }, + dealt: 0, + taken: 0, + over: 0, + }; + let mut i = 0u32; + while i < ticks { + step(&mut f); + i += 1; + } + f + } + + /// Un duelo: las dos peleas en la MISMA invocacion. + /// + /// Medir dos llamadas sueltas no sirve, porque el arnes de pruebas reinicia + /// el presupuesto en cada invocacion de nivel superior. Lo que el contrato + /// de duelos va a hacer es esto: rehacer las dos peleas de una sola vez y + /// comparar. Entonces eso es lo que hay que medir. + pub fn bench_duel(env: Env, seed_a: u32, seed_b: u32, ticks: u32) -> i32 { + let a = Self::bench(env.clone(), seed_a, ticks); + let b = Self::bench(env, seed_b, ticks); + if a.dealt > b.dealt { + 1 + } else if b.dealt > a.dealt { + -1 + } else { + 0 + } + } +} + +mod test; diff --git a/contracts/medicion/src/test.rs b/contracts/medicion/src/test.rs new file mode 100644 index 0000000..90377aa --- /dev/null +++ b/contracts/medicion/src/test.rs @@ -0,0 +1,123 @@ +#![cfg(test)] + +extern crate std; + +use super::*; +use soroban_sdk::Env; + +/// Cuantos ticks dura una pelea de runa como mucho (`FIELD.fightCap`). +const FIGHT_CAP: u32 = 900; + +/// Los techos de una sola invocacion en Soroban. +const CPU_MAX: u64 = 100_000_000; +const MEM_MAX: u64 = 41_943_040; + +/// El contrato compilado. +/// +/// Esto importa mas de lo que parece. `env.register(Medicion, ())` corre el +/// contrato como Rust nativo, y entonces el medidor de presupuesto **no ve el +/// bucle**: da el mismo numero para un tick que para novecientos, porque lo +/// unico que cuenta es el costo de invocar. Para medir de verdad hay que +/// registrar el wasm, que es lo que la red va a ejecutar. +mod wasm { + soroban_sdk::contractimport!(file = "../target/wasm32v1-none/release/medicion.wasm"); +} + +fn medir(ticks: u32) -> (u64, u64, u32) { + let env = Env::default(); + let id = env.register(wasm::WASM, ()); + let c = wasm::Client::new(&env, &id); + env.cost_estimate().budget().reset_default(); + let f = c.bench(&12345u32, &ticks); + let b = env.cost_estimate().budget(); + (b.cpu_instruction_cost(), b.memory_bytes_cost(), f.tick) +} + +#[test] +fn el_peor_caso_entra_en_el_presupuesto() { + std::println!(""); + std::println!(" ticks cpu mem %cpu"); + let mut base = 0u64; + for t in [0u32, 1, 100, 300, 600, 900] { + let (cpu, mem, corridos) = medir(t); + assert_eq!(corridos, t, "la pelea corto antes: la medicion no vale"); + if t == 0 { + base = cpu; + } + std::println!(" {:>4} {:>10} {:>8} {:>4}%", t, cpu, mem, (cpu * 100) / CPU_MAX); + } + + let (cpu, mem, _) = medir(FIGHT_CAP); + let por_tick = (cpu.saturating_sub(base)) / FIGHT_CAP as u64; + std::println!(""); + std::println!(" invocar sin ticks : {}", base); + std::println!(" cada tick cuesta : {}", por_tick); + std::println!(" pelea de {} ticks: {} cpu ({}%), {} mem ({}%)", + FIGHT_CAP, cpu, (cpu * 100) / CPU_MAX, mem, (mem * 100) / MEM_MAX); + std::println!(" peleas por invocacion: {}", CPU_MAX / cpu.max(1)); + + assert!(cpu < CPU_MAX, "la pelea no entra en el presupuesto de cpu"); + assert!(mem < MEM_MAX, "la pelea no entra en el presupuesto de memoria"); +} + +#[test] +fn el_costo_crece_con_los_ticks() { + // Si esto falla, el medidor no esta viendo el bucle y cualquier conclusion + // que saquemos de los otros tests es mentira. + let (poco, _, _) = medir(10); + let (mucho, _, _) = medir(900); + std::println!(" 10 ticks: {} 900 ticks: {}", poco, mucho); + assert!(mucho > poco * 2, "el medidor no ve el bucle: la medicion no sirve"); +} + +#[test] +fn un_duelo_son_dos_peleas_y_tambien_entra() { + // Las dos peleas van en UNA invocacion, y eso importa: el arnes de pruebas + // reinicia el presupuesto en cada invocacion de nivel superior, asi que dos + // llamadas sueltas dan el costo de una sola y parece que un duelo sale + // gratis. Con bench_duel el numero es el de verdad. + let env = Env::default(); + let id = env.register(wasm::WASM, ()); + let c = wasm::Client::new(&env, &id); + env.cost_estimate().budget().reset_default(); + let ganador = c.bench_duel(&12345u32, &999u32, &FIGHT_CAP); + let cpu = env.cost_estimate().budget().cpu_instruction_cost(); + let mem = env.cost_estimate().budget().memory_bytes_cost(); + std::println!(" duelo, dos peleas de {} ticks en UNA invocacion:", FIGHT_CAP); + std::println!(" cpu {} ({}% del maximo)", cpu, (cpu * 100) / CPU_MAX); + std::println!(" memoria {} ({}% del maximo)", mem, (mem * 100) / MEM_MAX); + std::println!(" gano {}", ganador); + + // Y tiene que costar bastante mas que una pelea sola, o no las corrio a las + // dos y el numero no vale. + let (una, _, _) = medir(FIGHT_CAP); + assert!(cpu > una + (una / 2), "un duelo tiene que costar casi el doble que una pelea"); + assert!(cpu < CPU_MAX, "un duelo entero no entra"); + assert!(mem < MEM_MAX, "un duelo entero no entra en memoria"); +} + +#[test] +fn dos_peleas_con_la_misma_semilla_son_identicas() { + let env = Env::default(); + let id = env.register(wasm::WASM, ()); + let c = wasm::Client::new(&env, &id); + let a = c.replay(&777u32, &400u32); + let b = c.replay(&777u32, &400u32); + assert_eq!(a.dealt, b.dealt); + assert_eq!(a.taken, b.taken); + assert_eq!(a.tick, b.tick); + assert_eq!(a.hero_hp, b.hero_hp); +} + +#[test] +fn semillas_distintas_dan_peleas_distintas() { + let env = Env::default(); + let id = env.register(wasm::WASM, ()); + let c = wasm::Client::new(&env, &id); + let a = c.replay(&7u32, &400u32); + let b = c.replay(&99u32, &400u32); + assert!( + a.dealt != b.dealt || a.taken != b.taken || a.tick != b.tick, + "la semilla no esta cambiando nada" + ); +}