initial

Cargo.toml

@@ -13,6 +13,8 @@ members = [
     "gear-programs/vft-gateway/src/wasm",
     "gear-programs/*",
     "gear-programs/checkpoint-light-client/io",
+    "gear-programs/erc20-relay/app",
+    "gear-programs/erc20-relay/client",
     "utils-prometheus",
 ]
 
@@ -41,6 +43,8 @@ gear_proof_storage = { path = "gear-programs/proof-storage" }
 checkpoint_light_client-io = { path = "gear-programs/checkpoint-light-client/io", default-features = false }
 utils-prometheus = { path = "utils-prometheus" }
 checkpoint_light_client = { path = "gear-programs/checkpoint-light-client", default-features = false }
+erc20-relay-app = { path = "gear-programs/erc20-relay/app" }
+erc20-relay-client = { path = "gear-programs/erc20-relay/client" }
 
 plonky2 = { git = "https://github.com/gear-tech/plonky2.git", rev = "4a620f4d79efe9233d0e7682df5a2fc625b5420e" }
 plonky2_field = { git = "https://github.com/gear-tech/plonky2.git", rev = "4a620f4d79efe9233d0e7682df5a2fc625b5420e" }

gear-programs/erc20-relay/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "erc20-relay"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+erc20-relay-app.workspace = true
+
+[build-dependencies]
+erc20-relay-app.workspace = true
+sails-rs = { version = "0.4.0", features = ["wasm-builder"] }
+sails-idl-gen = "0.4.0"
+
+[features]
+wasm-binary = []

gear-programs/erc20-relay/README.md

@@ -0,0 +1,8 @@
+## The **erc20-relay** program
+
+The program workspace includes the following packages:
+- `erc20-relay` is the package allowing to build WASM binary for the program and IDL file for it. 
+- `erc20-relay-app` is the package containing business logic for the program represented by the `Erc20RelayService` structure.  
+- `erc20-relay-client` is the package containing the client for the program allowing to interact with it from another program, tests, or
+  off-chain client.
+

gear-programs/erc20-relay/app/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "erc20-relay-app"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+sails-rs = "0.4.0"
+ethereum-common.workspace = true
+
+[target.'cfg(all(target_arch = "wasm32", target_os = "unknown"))'.dependencies]
+getrandom = { version = "0.2", default-features = false, features = ["custom"] }
+lazy_static = { version = "1.1", features = ["spin_no_std"] }

gear-programs/erc20-relay/app/src/lib.rs

@@ -0,0 +1,68 @@
+#![no_std]
+
+use cell::RefCell;
+use sails_rs::prelude::*;
+use ethereum_common::
+    beacon::{
+        light::Block as LightBeaconBlock, BlockHeader as BeaconBlockHeader,
+    };
+
+const CAPACITY: usize = 500_000;
+
+#[derive(Clone, Debug, Decode, TypeInfo)]
+#[codec(crate = sails_rs::scale_codec)]
+#[scale_info(crate = sails_rs::scale_info)]
+pub struct BlockInclusionProof {
+    pub block: LightBeaconBlock,
+    pub headers: Vec<BeaconBlockHeader>,
+}
+
+#[derive(Clone, Debug, Decode, TypeInfo)]
+#[codec(crate = sails_rs::scale_codec)]
+#[scale_info(crate = sails_rs::scale_info)]
+pub struct EthToVaraEvent {
+    pub proof_block: BlockInclusionProof,
+    pub proof: Vec<Vec<u8>>,
+    pub transaction_index: u64,
+    pub receipt_rlp: Vec<u8>,
+}
+
+struct State {
+    checkpoints: ActorId,
+    vft: ActorId,
+    // (slot, transaction_index)
+    transactions: Vec<(u64, u64)>,
+}
+
+struct Erc20RelayService<'a>(&'a RefCell<State>);
+
+#[sails_rs::service]
+impl<'a> Erc20RelayService<'a> {
+    pub fn new(state: &'a RefCell<State>) -> Self {
+        Self(state)
+    }
+
+    pub fn relay(&mut self, message: EthToVaraEvent) -> String {
+        "Hello from Erc20Relay!".to_string()
+    }
+}
+
+pub struct Erc20RelayProgram(RefCell<State>);
+
+#[sails_rs::program]
+impl Erc20RelayProgram {
+    pub fn new(
+        checkpoints: ActorId,
+        vft: ActorId,
+    ) -> Self {
+        Self(RefCell::new(State {
+            checkpoints,
+            vft,
+            transactions: Vec::with_capacity(CAPACITY),
+        }))
+    }
+
+    pub fn erc20_relay(&self) -> Erc20RelayService {
+        Erc20RelayService::new(&self.0)
+    }
+}