refactor

examples/local_signer.rs

@@ -1,20 +1,21 @@
 use ethers::providers::{Provider, ProviderTrait};
 use ethers::types::{BlockNumber, UnsignedTransaction};
-use ethers::wallet::{Mainnet, Wallet};
+use ethers::wallet::MainnetWallet;
 use std::convert::TryFrom;
 use std::str::FromStr;
 
 #[tokio::main]
 async fn main() -> Result<(), failure::Error> {
     let provider = Provider::try_from("http://localhost:8545")?;
-    let signer = Wallet::<Mainnet>::from_str(
+    let client = MainnetWallet::from_str(
         "d8ebe1e50cfea1f9961908d9df28e64bb163fee9ee48320361b2eb0a54974269",
     )?
     .connect(&provider);
 
     let nonce = provider
-        .get_transaction_count(signer.inner.address, Some(BlockNumber::Latest))
+        .get_transaction_count(client.signer.address, None)
         .await?;
+
     let tx = UnsignedTransaction {
         to: Some("986eE0C8B91A58e490Ee59718Cca41056Cf55f24".parse().unwrap()),
         gas: 21000.into(),
@@ -24,10 +25,9 @@ async fn main() -> Result<(), failure::Error> {
         nonce,
     };
 
-    let tx = signer.send_transaction(tx).await?;
+    let tx = client.send_transaction(tx).await?;
 
-    dbg!(tx.hash);
-    let tx = provider.get_transaction(tx.hash).await?;
+    let tx = client.get_transaction(tx.hash).await?;
 
     println!("{}", serde_json::to_string(&tx)?);
 

src/providers.rs

@@ -58,7 +58,7 @@ impl ProviderTrait for Provider {
         block: Option<BlockNumber>,
     ) -> Result<U256, Self::Error> {
         let from = utils::serialize(&from);
-        let block = utils::serialize(&block);
+        let block = utils::serialize(&block.unwrap_or(BlockNumber::Latest));
         self.0
             .request("eth_getTransactionCount", Some(&[from, block]))
             .await

src/types/block.rs

@@ -1,4 +1,5 @@
 use super::U64;
+use serde::{Serialize, Serializer};
 
 /// Block Number
 #[derive(Copy, Clone, Debug, PartialEq)]
@@ -13,8 +14,6 @@ pub enum BlockNumber {
     Number(U64),
 }
 
-use serde::{Serialize, Serializer};
-
 impl<T: Into<U64>> From<T> for BlockNumber {
     fn from(num: T) -> Self {
         BlockNumber::Number(num.into())

src/types/mod.rs

@@ -1,6 +1,7 @@
 //! Various Ethereum Related Datatypes
 
 // Re-export common ethereum datatypes with more specific names
+pub use ethereum_types::H256 as TxHash;
 pub use ethereum_types::{Address, H256, U256, U64};
 
 mod transaction;
@@ -19,49 +20,3 @@ pub use bytes::Bytes;
 
 mod block;
 pub use block::BlockNumber;
-
-use rustc_hex::{FromHex, ToHex};
-use serde::{
-    de::{Error, Unexpected},
-    Deserialize, Deserializer, Serialize, Serializer,
-};
-
-/// Wrapper type 0round Vec<u8> to deserialize/serialize "0x" prefixed ethereum hex strings
-#[derive(Clone, Debug, Default, PartialEq, Eq, Hash, Serialize, Deserialize)]
-pub struct TxHash(
-    #[serde(
-        serialize_with = "serialize_h256",
-        deserialize_with = "deserialize_h256"
-    )]
-    pub H256,
-);
-
-impl From<H256> for TxHash {
-    fn from(src: H256) -> TxHash {
-        TxHash(src)
-    }
-}
-
-pub fn serialize_h256<S, T>(x: T, s: S) -> Result<S::Ok, S::Error>
-where
-    S: Serializer,
-    T: AsRef<[u8]>,
-{
-    s.serialize_str(&format!("0x{}", x.as_ref().to_hex::<String>()))
-}
-
-pub fn deserialize_h256<'de, D>(d: D) -> Result<H256, D::Error>
-where
-    D: Deserializer<'de>,
-{
-    let value = String::deserialize(d)?;
-    if value.len() >= 2 && &value[0..2] == "0x" {
-        let slice: Vec<u8> = FromHex::from_hex(&value[2..])
-            .map_err(|e| Error::custom(format!("Invalid hex: {}", e)))?;
-        let mut bytes = [0u8; 32];
-        bytes.copy_from_slice(&slice[..32]);
-        Ok(bytes.into())
-    } else {
-        Err(Error::invalid_value(Unexpected::Str(&value), &"0x prefix"))
-    }
-}

src/wallet.rs

@@ -1,159 +0,0 @@
-use crate::{
-    jsonrpc::ClientError,
-    providers::{Provider, ProviderTrait},
-    types::{Address, PrivateKey, PublicKey, Signature, U64},
-    types::{Transaction, UnsignedTransaction},
-};
-use rand::Rng;
-use std::{marker::PhantomData, str::FromStr};
-
-use thiserror::Error;
-
-/// A keypair
-#[derive(Clone, Debug)]
-pub struct Wallet<N> {
-    pub private_key: PrivateKey,
-    pub public_key: PublicKey,
-    pub address: Address,
-    network: PhantomData<N>,
-}
-
-pub trait Network {
-    const CHAIN_ID: Option<U64>;
-
-    // TODO: Default providers?
-}
-
-#[derive(Copy, Clone, Debug, PartialEq, Eq)]
-pub struct Mainnet;
-
-impl Network for Mainnet {
-    const CHAIN_ID: Option<U64> = Some(U64([1]));
-}
-
-#[derive(Copy, Clone, Debug, PartialEq, Eq)]
-pub struct AnyNet;
-
-impl Network for AnyNet {
-    const CHAIN_ID: Option<U64> = None;
-}
-
-// No EIP-155 used
-pub type AnyWallet = Wallet<AnyNet>;
-
-impl<N: Network> Wallet<N> {
-    /// Creates a new keypair
-    pub fn new<R: Rng>(rng: &mut R) -> Self {
-        let private_key = PrivateKey::new(rng);
-        let public_key = PublicKey::from(&private_key);
-        let address = Address::from(&private_key);
-
-        Self {
-            private_key,
-            public_key,
-            address,
-            network: PhantomData,
-        }
-    }
-
-    /// Connects to a provider and returns a signer
-    pub fn connect<'a>(self, provider: &'a Provider) -> Signer<Wallet<N>> {
-        Signer {
-            inner: self,
-            provider: Some(provider),
-        }
-    }
-}
-
-impl<N: Network> FromStr for Wallet<N> {
-    type Err = secp256k1::Error;
-
-    fn from_str(src: &str) -> Result<Self, Self::Err> {
-        Ok(PrivateKey::from_str(src)?.into())
-    }
-}
-
-impl<N: Network> From<PrivateKey> for Wallet<N> {
-    fn from(private_key: PrivateKey) -> Self {
-        let public_key = PublicKey::from(&private_key);
-        let address = Address::from(&private_key);
-
-        Self {
-            private_key,
-            public_key,
-            address,
-            network: PhantomData,
-        }
-    }
-}
-
-#[derive(Clone, Debug)]
-pub struct Signer<'a, S> {
-    pub provider: Option<&'a Provider>,
-    pub inner: S,
-}
-
-#[derive(Error, Debug)]
-pub enum SignerError {
-    #[error(transparent)]
-    ClientError(#[from] ClientError),
-    #[error("no provider was found")]
-    NoProvider,
-}
-
-impl<'a, N: Network> Signer<'a, Wallet<N>> {
-    /// Generates a random signer with no provider. Should be combined with the
-    /// `connect` method like `Signer::random(rng).connect(provider)`
-    pub fn random<R: Rng>(rng: &mut R) -> Self {
-        Signer {
-            provider: None,
-            inner: Wallet::new(rng),
-        }
-    }
-
-    pub async fn send_transaction(
-        &self,
-        tx: UnsignedTransaction,
-    ) -> Result<Transaction, SignerError> {
-        // TODO: Is there any nicer way to do this?
-        let provider = self.ensure_provider()?;
-
-        let signed_tx = self.sign_transaction(tx.clone());
-
-        provider.send_raw_transaction(&signed_tx.rlp()).await?;
-
-        Ok(signed_tx)
-    }
-}
-
-impl<'a, S> Signer<'a, S> {
-    /// Sets the provider for the signer
-    pub fn connect(mut self, provider: &'a Provider) -> Self {
-        self.provider = Some(provider);
-        self
-    }
-
-    pub fn ensure_provider(&self) -> Result<&Provider, SignerError> {
-        if let Some(provider) = self.provider {
-            Ok(provider)
-        } else {
-            Err(SignerError::NoProvider)
-        }
-    }
-}
-
-trait SignerC {
-    /// Signs the hash of the provided message after prefixing it
-    fn sign_message<S: AsRef<[u8]>>(&self, message: S) -> Signature;
-    fn sign_transaction(&self, message: UnsignedTransaction) -> Transaction;
-}
-
-impl<'a, N: Network> SignerC for Signer<'a, Wallet<N>> {
-    fn sign_message<S: AsRef<[u8]>>(&self, message: S) -> Signature {
-        self.inner.private_key.sign(message)
-    }
-
-    fn sign_transaction(&self, tx: UnsignedTransaction) -> Transaction {
-        self.inner.private_key.sign_transaction(tx, N::CHAIN_ID)
-    }
-}

src/wallet/client.rs

@@ -0,0 +1,45 @@
+use crate::{
+    jsonrpc::ClientError,
+    providers::{Provider, ProviderTrait},
+    types::{Transaction, TxHash, UnsignedTransaction},
+    wallet::Signer,
+};
+
+use thiserror::Error;
+
+#[derive(Clone, Debug)]
+pub struct Client<'a, S> {
+    pub(super) provider: &'a Provider,
+    pub signer: S,
+}
+
+#[derive(Error, Debug)]
+pub enum SignerError {
+    #[error(transparent)]
+    ClientError(#[from] ClientError),
+    #[error("no provider was found")]
+    NoProvider,
+}
+
+impl<'a, S: Signer> Client<'a, S> {
+    pub async fn send_transaction(
+        &self,
+        tx: UnsignedTransaction,
+    ) -> Result<Transaction, SignerError> {
+        // sign the transaction
+        let signed_tx = self.signer.sign_transaction(tx.clone());
+
+        // broadcast it
+        self.provider.send_raw_transaction(&signed_tx.rlp()).await?;
+
+        Ok(signed_tx)
+    }
+
+    // TODO: Forward all other calls to the provider
+    pub async fn get_transaction<T: Send + Sync + Into<TxHash>>(
+        &self,
+        hash: T,
+    ) -> Result<Transaction, ClientError> {
+        self.provider.get_transaction(hash).await
+    }
+}

src/wallet/mod.rs

@@ -0,0 +1,22 @@
+mod networks;
+pub use networks::instantiated::*;
+use networks::Network;
+
+mod wallet;
+pub use wallet::Wallet;
+
+mod client;
+use client::Client;
+
+use crate::types::{Signature, Transaction, UnsignedTransaction};
+
+/// Trait for signing transactions and messages
+///
+/// Implement this trait to support different signing modes, e.g. Ledger, hosted etc.
+pub trait Signer {
+    /// Signs the hash of the provided message after prefixing it
+    fn sign_message<S: AsRef<[u8]>>(&self, message: S) -> Signature;
+
+    /// Signs the transaction
+    fn sign_transaction(&self, message: UnsignedTransaction) -> Transaction;
+}

src/wallet/networks.rs

@@ -0,0 +1,35 @@
+//! Networks are used inside wallets to ensure type-safety across networks. That way
+//! a transaction that is designed to work with testnet does not accidentally work
+//! with mainnet because the URL was changed.
+
+use crate::types::U64;
+
+pub trait Network {
+    const CHAIN_ID: Option<U64>;
+
+    // TODO: Default providers? e.g. `mainnet.infura.io/XXX`?
+}
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub struct Mainnet;
+
+impl Network for Mainnet {
+    const CHAIN_ID: Option<U64> = Some(U64([1]));
+}
+
+/// No EIP155
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub struct EIP155Disabled;
+
+// EIP155 being disabled means no chainId will be used
+impl Network for EIP155Disabled {
+    const CHAIN_ID: Option<U64> = None;
+}
+
+pub mod instantiated {
+    use super::*;
+    use crate::wallet::Wallet;
+
+    pub type MainnetWallet = Wallet<Mainnet>;
+    pub type AnyWallet = Wallet<EIP155Disabled>;
+}

src/wallet/wallet.rs

@@ -0,0 +1,75 @@
+use crate::{
+    providers::Provider,
+    types::{Address, PrivateKey, PublicKey, Signature, Transaction, UnsignedTransaction},
+    wallet::{Client, Network, Signer},
+};
+
+use rand::Rng;
+use std::{marker::PhantomData, str::FromStr};
+
+/// A keypair
+#[derive(Clone, Debug)]
+pub struct Wallet<N> {
+    pub private_key: PrivateKey,
+    pub public_key: PublicKey,
+    pub address: Address,
+    network: PhantomData<N>,
+}
+
+impl<'a, N: Network> Signer for Wallet<N> {
+    fn sign_message<S: AsRef<[u8]>>(&self, message: S) -> Signature {
+        self.private_key.sign(message)
+    }
+
+    fn sign_transaction(&self, tx: UnsignedTransaction) -> Transaction {
+        self.private_key.sign_transaction(tx, N::CHAIN_ID)
+    }
+}
+
+impl<N: Network> Wallet<N> {
+    // TODO: Add support for mnemonic and encrypted JSON
+
+    /// Creates a new random keypair seeded with the provided RNG
+    pub fn new<R: Rng>(rng: &mut R) -> Self {
+        let private_key = PrivateKey::new(rng);
+        let public_key = PublicKey::from(&private_key);
+        let address = Address::from(&private_key);
+
+        Self {
+            private_key,
+            public_key,
+            address,
+            network: PhantomData,
+        }
+    }
+
+    /// Connects to a provider and returns a signer
+    pub fn connect(self, provider: &Provider) -> Client<Wallet<N>> {
+        Client {
+            signer: self,
+            provider,
+        }
+    }
+}
+
+impl<N: Network> From<PrivateKey> for Wallet<N> {
+    fn from(private_key: PrivateKey) -> Self {
+        let public_key = PublicKey::from(&private_key);
+        let address = Address::from(&private_key);
+
+        Self {
+            private_key,
+            public_key,
+            address,
+            network: PhantomData,
+        }
+    }
+}
+
+impl<N: Network> FromStr for Wallet<N> {
+    type Err = secp256k1::Error;
+
+    fn from_str(src: &str) -> Result<Self, Self::Err> {
+        Ok(PrivateKey::from_str(src)?.into())
+    }
+}