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a/decrement/contracts/decrement/src/lib.rs b/decrement/contracts/decrement/src/lib.rs new file mode 100644 index 00000000..b3360522 --- /dev/null +++ b/decrement/contracts/decrement/src/lib.rs @@ -0,0 +1,34 @@ +#![no_std] +use soroban_sdk::{contract, contractimpl, log, symbol_short, Env, Symbol}; + +const COUNTER: Symbol = symbol_short!("COUNTER"); + +#[contract] +pub struct DecrementContract; + +#[contractimpl] +impl DecrementContract { + /// Decrement decrements an internal counter, and returns the value. + pub fn decrement(env: Env) -> i32 { + // Get the current count. + let mut count: i32 = env.storage().instance().get(&COUNTER).unwrap_or(0); // If no value set, assume 0. + log!(&env, "count: {}", count); + + // Decrement the count. + count -= 2; + + // Save the count. + env.storage().instance().set(&COUNTER, &count); + + // The contract instance will be bumped to have a lifetime of at least 100 ledgers if the current expiration lifetime at most 50. + // If the lifetime is already more than 100 ledgers, this is a no-op. Otherwise, + // the lifetime is extended to 100 ledgers. This lifetime bump includes the contract + // instance itself and all entries in storage().instance(), i.e, COUNTER. + env.storage().instance().extend_ttl(50, 100); + + // Return the count to the caller. + count + } +} + +mod test; diff --git a/decrement/contracts/decrement/src/test.rs b/decrement/contracts/decrement/src/test.rs new file mode 100644 index 00000000..c40d5474 --- /dev/null +++ b/decrement/contracts/decrement/src/test.rs @@ -0,0 +1,19 @@ +#![cfg(test)] + +use super::{DecrementContract, DecrementContractClient}; +use soroban_sdk::{testutils::Logs, Env}; + +extern crate std; + +#[test] +fn test() { + let env = Env::default(); + let contract_id = env.register_contract(None, DecrementContract); + let client = DecrementContractClient::new(&env, &contract_id); + + assert_eq!(client.decrement(), -2); + assert_eq!(client.decrement(), -4); + assert_eq!(client.decrement(), -6); + + std::println!("{}", env.logs().all().join("\n")); +}