First App

1#![cfg_attr(not(feature = "export-abi"), no_main)]
2extern crate alloc;
3
4#[global_allocator]
5static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
6
7use stylus_sdk::{alloy_primitives::U256, prelude::*, storage::StorageU256};
8
9/// The solidity_storage macro allows this struct to be used in persistent
10/// storage. It accepts fields that implement the StorageType trait. Built-in
11/// storage types for Solidity ABI primitives are found under
12/// stylus_sdk::storage.
13#[solidity_storage]
14/// The entrypoint macro defines where Stylus execution begins. External methods
15/// are exposed by annotating an impl for this struct with #[external] as seen
16/// below.
17#[entrypoint]
18pub struct Counter {
19    count: StorageU256,
20}
21
22/// Define an implementation of the Counter struct, defining a set_count
23/// as well as inc and dec methods using the features of the Stylus SDK.
24#[external]
25impl Counter {
26    /// Gets the number from storage.
27    pub fn get(&self) -> Result<U256, Vec<u8>> {
28        Ok(self.count.get())
29    }
30
31    /// Sets the count in storage to a user-specified value.
32    pub fn set_count(&mut self, count: U256) -> Result<(), Vec<u8>> {
33        self.count.set(count);
34        Ok(())
35    }
36
37    /// Increments count by 1
38    pub fn inc(&mut self) -> Result<(), Vec<u8>> {
39        let count = self.count.get() + U256::from(1);
40        self.set_count(count)
41    }
42
43    /// Decrements count by 1
44    pub fn dec(&mut self) -> Result<(), Vec<u8>> {
45        let count = self.count.get() - U256::from(1);
46        self.set_count(count)
47    }
48}

1#![cfg_attr(not(feature = "export-abi"), no_main)]
2
3#[cfg(feature = "export-abi")]
4fn main() {
5    stylus_counter::main();
6}

1[package]
2name = "stylus-counter"
3version = "0.1.5"
4edition = "2021"
5
6[dependencies]
7alloy-primitives = "0.3.1"
8alloy-sol-types = "0.3.1"
9stylus-sdk = "0.4.1"
10hex = "0.4.3"
11wee_alloc = "0.4.5"
12
13[dev-dependencies]
14tokio = { version = "1.12.0", features = ["full"] }
15ethers = "2.0"
16eyre = "0.6.8"
17
18[features]
19export-abi = ["stylus-sdk/export-abi"]
20
21[[bin]]
22name = "stylus-counter"
23path = "src/main.rs"
24
25[lib]
26crate-type = ["lib", "cdylib"]