Add deposit_contract crate

Cargo.toml

@@ -7,6 +7,7 @@ members = [
     "eth2/utils/bls",
     "eth2/utils/compare_fields",
     "eth2/utils/compare_fields_derive",
+    "eth2/utils/deposit_contract",
     "eth2/utils/eth2_config",
     "eth2/utils/eth2_interop_keypairs",
     "eth2/utils/logging",

eth2/utils/deposit_contract/.gitignore

@@ -0,0 +1 @@
+contract/

eth2/utils/deposit_contract/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "deposit_contract"
+version = "0.1.0"
+authors = ["Paul Hauner <paul@paulhauner.com>"]
+edition = "2018"
+
+build = "build.rs"
+
+[build-dependencies]
+reqwest = "0.9.20"
+serde_json = "1.0"
+
+[dependencies]
+types = { path = "../../types"}
+eth2_ssz = { path = "../ssz"}
+tree_hash = { path = "../tree_hash"}
+ethabi = "9.0"

eth2/utils/deposit_contract/src/lib.rs

@@ -0,0 +1,56 @@
+use ethabi::{Contract, Token};
+use ssz::Encode;
+use types::{ChainSpec, DepositData, SecretKey};
+
+pub use ethabi::Error;
+
+pub const CONTRACT_DEPLOY_GAS: usize = 4_000_000;
+pub const DEPOSIT_GAS: usize = 4_000_000;
+pub const ABI: &[u8] = include_bytes!("../contract/v0.8.3_validator_registration.json");
+pub const BYTECODE: &[u8] = include_bytes!("../contract/v0.8.3_validator_registration.bytecode");
+
+pub fn eth1_tx_data(deposit_data: &DepositData) -> Result<Vec<u8>, Error> {
+    let params = vec![
+        Token::Bytes(deposit_data.pubkey.as_ssz_bytes()),
+        Token::Bytes(deposit_data.withdrawal_credentials.as_ssz_bytes()),
+        Token::Bytes(deposit_data.signature.as_ssz_bytes()),
+    ];
+
+    let abi = Contract::load(ABI)?;
+    let function = abi.function("deposit")?;
+    function.encode_input(&params)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use types::{
+        test_utils::generate_deterministic_keypair, EthSpec, Hash256, Keypair, MinimalEthSpec,
+        Signature,
+    };
+
+    type E = MinimalEthSpec;
+
+    fn get_deposit(keypair: Keypair, spec: &ChainSpec) -> DepositData {
+        let mut deposit_data = DepositData {
+            pubkey: keypair.pk.into(),
+            withdrawal_credentials: Hash256::from_slice(&[42; 32]),
+            amount: u64::max_value(),
+            signature: Signature::empty_signature().into(),
+        };
+        deposit_data.signature = deposit_data.create_signature(&keypair.sk, spec);
+        deposit_data
+    }
+
+    #[test]
+    fn basic() {
+        let spec = &E::default_spec();
+
+        let keypair = generate_deterministic_keypair(42);
+        let deposit = get_deposit(keypair.clone(), spec);
+
+        let data = eth1_tx_data(&deposit).expect("should produce tx data");
+
+        assert_eq!(data.len(), 388, "bytes should be correct length");
+    }
+}

tests/eth1_test_rig/Cargo.toml

@@ -4,12 +4,6 @@ version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
 edition = "2018"
 
-build = "build.rs"
-
-[build-dependencies]
-reqwest = "0.9.20"
-serde_json = "1.0"
-
 [dependencies]
 web3 = "0.8.0"
 tokio = "0.1.17"
@@ -17,3 +11,4 @@ futures = "0.1.25"
 types = { path = "../../eth2/types"}
 eth2_ssz = { path = "../../eth2/utils/ssz"}
 serde_json = "1.0"
+deposit_contract = { path = "../../eth2/utils/deposit_contract"}

tests/eth1_test_rig/src/lib.rs

@@ -7,6 +7,7 @@
 //! some initial issues.
 mod ganache;
 
+use deposit_contract::{eth1_tx_data, ABI, BYTECODE, CONTRACT_DEPLOY_GAS, DEPOSIT_GAS};
 use futures::{stream, Future, IntoFuture, Stream};
 use ganache::GanacheInstance;
 use ssz::Encode;
@@ -16,19 +17,12 @@ use types::DepositData;
 use types::{EthSpec, Hash256, Keypair, Signature};
 use web3::contract::{Contract, Options};
 use web3::transports::Http;
-use web3::types::{Address, U256};
+use web3::types::{Address, TransactionRequest, U256};
 use web3::{Transport, Web3};
 
 pub const DEPLOYER_ACCOUNTS_INDEX: usize = 0;
 pub const DEPOSIT_ACCOUNTS_INDEX: usize = 0;
 
-const CONTRACT_DEPLOY_GAS: usize = 4_000_000;
-const DEPOSIT_GAS: usize = 4_000_000;
-
-// Deposit contract
-pub const ABI: &[u8] = include_bytes!("../contract/v0.8.3_validator_registration.json");
-pub const BYTECODE: &[u8] = include_bytes!("../contract/v0.8.3_validator_registration.bytecode");
-
 /// Provides a dedicated ganache-cli instance with the deposit contract already deployed.
 pub struct GanacheEth1Instance {
     pub ganache: GanacheInstance,
@@ -138,6 +132,7 @@ impl DepositContract {
         deposit_data: DepositData,
     ) -> impl Future<Item = (), Error = String> {
         let contract = self.contract.clone();
+        let web3_1 = self.web3.clone();
 
         self.web3
             .eth()
@@ -149,19 +144,27 @@ impl DepositContract {
                     .cloned()
                     .ok_or_else(|| "Insufficient accounts for deposit".to_string())
             })
-            .and_then(move |from_address| {
-                let params = (
-                    deposit_data.pubkey.as_ssz_bytes(),
-                    deposit_data.withdrawal_credentials.as_ssz_bytes(),
-                    deposit_data.signature.as_ssz_bytes(),
-                );
-                let options = Options {
+            .and_then(move |from| {
+                let tx_request = TransactionRequest {
+                    from,
+                    to: Some(contract.address()),
                     gas: Some(U256::from(DEPOSIT_GAS)),
+                    gas_price: None,
                     value: Some(from_gwei(deposit_data.amount)),
-                    ..Options::default()
+                    // Note: the reason we use this `TransactionRequest` instead of just using the
+                    // function in `self.contract` is so that the `eth1_tx_data` function gets used
+                    // during testing.
+                    //
+                    // It's important that `eth1_tx_data` stays correct and does not suffer from
+                    // code-rot.
+                    data: eth1_tx_data(&deposit_data).map(Into::into).ok(),
+                    nonce: None,
+                    condition: None,
                 };
-                contract
-                    .call("deposit", params, from_address, options)
+
+                web3_1
+                    .eth()
+                    .send_transaction(tx_request)
                     .map_err(|e| format!("Failed to call deposit fn: {:?}", e))
             })
             .map(|_| ())