Merge pull request #1 from gakonst/master

Update

CHANGELOG.md

@@ -130,6 +130,13 @@
 
 ## ethers-providers
 
+### Unreleased
+
+- Add support for basic and bearer authentication in http and non-wasm websockets.
+  [829](https://github.com/gakonst/ethers-rs/pull/829)
+- Export `ethers_providers::IpcError` and `ethers_providers::QuorumError`
+  [1012](https://github.com/gakonst/ethers-rs/pull/1012)
+
 ### 0.6.0
 
 - re-export error types for `Http` and `Ws` providers in
@@ -144,11 +151,6 @@
 - Add support for `evm_snapshot` and `evm_revert` dev RPC methods.
   [640](https://github.com/gakonst/ethers-rs/pull/640)
 
-### Unreleased
-
-- Add support for basic and bearer authentication in http and non-wasm websockets.
-  [829](https://github.com/gakonst/ethers-rs/pull/829)
-
 ### 0.5.3
 
 - Expose `ens` module [#435](https://github.com/gakonst/ethers-rs/pull/435)

Cargo.lock

@@ -1322,6 +1322,7 @@ dependencies = [
  "futures-util",
  "hex",
  "http",
+ "once_cell",
  "parking_lot",
  "pin-project",
  "reqwest",
@@ -2666,9 +2667,9 @@ checksum = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
 
 [[package]]
 name = "pretty_assertions"
-version = "1.1.0"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76d5b548b725018ab5496482b45cb8bef21e9fed1858a6d674e3a8a0f0bb5d50"
+checksum = "57c038cb5319b9c704bf9c227c261d275bfec0ad438118a2787ce47944fb228b"
 dependencies = [
  "ansi_term",
  "ctor",
@@ -3575,7 +3576,7 @@ checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
 [[package]]
 name = "svm-rs"
 version = "0.2.9"
-source = "git+https://github.com/roynalnaruto/svm-rs#8e33f55fa2a2afb937749e31b2ffa42600bfe216"
+source = "git+https://github.com/roynalnaruto/svm-rs#ae79a29f5bde08f1991f981456253fa5b6859047"
 dependencies = [
  "anyhow",
  "cfg-if 1.0.0",

ethers-contract/ethers-contract-abigen/src/multi.rs

@@ -709,8 +709,9 @@ fn check_file_in_dir(dir: &Path, file_name: &str, expected_contents: &[u8]) -> R
     let file_path = dir.join(file_name);
     eyre::ensure!(file_path.is_file(), "Not a file: {}", file_path.display());
 
-    let contents = fs::read(file_path).expect("Unable to read file");
+    let contents = fs::read(&file_path).expect("Unable to read file");
-    eyre::ensure!(contents == expected_contents, "file contents do not match");
+    eyre::ensure!(contents == expected_contents, format!("The contents of `{}` do not match the expected output of the newest `ethers::Abigen` version.\
+This indicates that the existing bindings are outdated and need to be generated again.", file_path.display()));
     Ok(())
 }
 

ethers-etherscan/src/contract.rs

@@ -105,6 +105,7 @@ impl VerifyContract {
     ) -> Self {
         self.constructor_arguments = constructor_arguments.map(|s| {
             s.into()
+                .trim()
                 // TODO is this correct?
                 .trim_start_matches("0x")
                 .to_string()

ethers-middleware/src/signer.rs

@@ -1,5 +1,6 @@
 use ethers_core::types::{
-    transaction::eip2718::TypedTransaction, Address, BlockId, Bytes, Signature,
+    transaction::{eip2718::TypedTransaction, eip2930::AccessListWithGasUsed},
+    Address, BlockId, Bytes, Signature, U256,
 };
 use ethers_providers::{maybe, FromErr, Middleware, PendingTransaction};
 use ethers_signers::Signer;
@@ -158,6 +159,14 @@ where
         this.signer = signer;
         this
     }
+
+    fn set_tx_from_if_none(&self, tx: &TypedTransaction) -> TypedTransaction {
+        let mut tx = tx.clone();
+        if tx.from().is_none() {
+            tx.set_from(self.address);
+        }
+        tx
+    }
 }
 
 #[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
@@ -264,6 +273,32 @@ where
     ) -> Result<Signature, Self::Error> {
         self.signer.sign_message(data.into()).await.map_err(SignerMiddlewareError::SignerError)
     }
+
+    async fn estimate_gas(&self, tx: &TypedTransaction) -> Result<U256, Self::Error> {
+        let tx = self.set_tx_from_if_none(tx);
+        self.inner.estimate_gas(&tx).await.map_err(SignerMiddlewareError::MiddlewareError)
+    }
+
+    async fn create_access_list(
+        &self,
+        tx: &TypedTransaction,
+        block: Option<BlockId>,
+    ) -> Result<AccessListWithGasUsed, Self::Error> {
+        let tx = self.set_tx_from_if_none(tx);
+        self.inner
+            .create_access_list(&tx, block)
+            .await
+            .map_err(SignerMiddlewareError::MiddlewareError)
+    }
+
+    async fn call(
+        &self,
+        tx: &TypedTransaction,
+        block: Option<BlockId>,
+    ) -> Result<Bytes, Self::Error> {
+        let tx = self.set_tx_from_if_none(tx);
+        self.inner().call(&tx, block).await.map_err(SignerMiddlewareError::MiddlewareError)
+    }
 }
 
 #[cfg(all(test, not(feature = "celo"), not(target_arch = "wasm32")))]

ethers-middleware/tests/gas_escalator.rs

@@ -4,7 +4,7 @@ use ethers_middleware::{
     gas_escalator::{Frequency, GasEscalatorMiddleware, GeometricGasPrice},
     signer::SignerMiddleware,
 };
-use ethers_providers::{Middleware, Provider, Ws};
+use ethers_providers::Middleware;
 use ethers_signers::{LocalWallet, Signer};
 use std::time::Duration;
 
@@ -12,10 +12,8 @@ use std::time::Duration;
 #[ignore]
 async fn gas_escalator_live() {
     // connect to ropsten for getting bad block times
-    let ws = Ws::connect("wss://ropsten.infura.io/ws/v3/fd8b88b56aa84f6da87b60f5441d6778")
+    let provider = ethers_providers::ROPSTEN.ws().await;
-        .await
+    let provider = provider.interval(Duration::from_millis(2000u64));
-        .unwrap();
-    let provider = Provider::new(ws).interval(Duration::from_millis(2000u64));
     let wallet = "fdb33e2105f08abe41a8ee3b758726a31abdd57b7a443f470f23efce853af169"
         .parse::<LocalWallet>()
         .unwrap();

ethers-middleware/tests/nonce_manager.rs

@@ -4,14 +4,11 @@
 async fn nonce_manager() {
     use ethers_core::types::*;
     use ethers_middleware::{nonce_manager::NonceManagerMiddleware, signer::SignerMiddleware};
-    use ethers_providers::{Http, Middleware, Provider};
+    use ethers_providers::Middleware;
     use ethers_signers::{LocalWallet, Signer};
-    use std::{convert::TryFrom, time::Duration};
+    use std::time::Duration;
 
-    let provider =
+    let provider = ethers_providers::RINKEBY.provider().interval(Duration::from_millis(2000u64));
-        Provider::<Http>::try_from("https://rinkeby.infura.io/v3/fd8b88b56aa84f6da87b60f5441d6778")
-            .unwrap()
-            .interval(Duration::from_millis(2000u64));
     let chain_id = provider.get_chainid().await.unwrap().as_u64();
 
     let wallet = std::env::var("RINKEBY_PRIVATE_KEY")

ethers-middleware/tests/signer.rs

@@ -1,5 +1,5 @@
 #![allow(unused)]
-use ethers_providers::{Http, JsonRpcClient, Middleware, Provider};
+use ethers_providers::{Http, JsonRpcClient, Middleware, Provider, RINKEBY};
 
 use ethers_core::{
     types::{BlockNumber, TransactionRequest},
@@ -8,7 +8,7 @@ use ethers_core::{
 use ethers_middleware::signer::SignerMiddleware;
 use ethers_signers::{coins_bip39::English, LocalWallet, MnemonicBuilder, Signer};
 use once_cell::sync::Lazy;
-use std::{convert::TryFrom, sync::atomic::AtomicU8, time::Duration};
+use std::{convert::TryFrom, iter::Cycle, sync::atomic::AtomicU8, time::Duration};
 
 static WALLETS: Lazy<TestWallets> = Lazy::new(|| {
     TestWallets {
@@ -54,10 +54,7 @@ async fn send_eth() {
 #[tokio::test]
 #[cfg(not(feature = "celo"))]
 async fn pending_txs_with_confirmations_testnet() {
-    let provider =
+    let provider = RINKEBY.provider().interval(Duration::from_millis(3000));
-        Provider::<Http>::try_from("https://rinkeby.infura.io/v3/c60b0bb42f8a4c6481ecd229eddaca27")
-            .unwrap()
-            .interval(Duration::from_millis(3000));
     let chain_id = provider.get_chainid().await.unwrap();
     let wallet = WALLETS.next().with_chain_id(chain_id.as_u64());
     let address = wallet.address();
@@ -72,11 +69,7 @@ use ethers_core::types::{Address, Eip1559TransactionRequest};
 #[tokio::test]
 #[cfg(not(feature = "celo"))]
 async fn websocket_pending_txs_with_confirmations_testnet() {
-    let provider =
+    let provider = RINKEBY.ws().await.interval(Duration::from_millis(3000));
-        Provider::connect("wss://rinkeby.infura.io/ws/v3/c60b0bb42f8a4c6481ecd229eddaca27")
-            .await
-            .unwrap()
-            .interval(Duration::from_millis(3000));
     let chain_id = provider.get_chainid().await.unwrap();
     let wallet = WALLETS.next().with_chain_id(chain_id.as_u64());
     let address = wallet.address();
@@ -97,9 +90,7 @@ async fn generic_pending_txs_test<M: Middleware>(provider: M, who: Address) {
 #[tokio::test]
 #[cfg(not(feature = "celo"))]
 async fn typed_txs() {
-    let provider =
+    let provider = RINKEBY.provider();
-        Provider::<Http>::try_from("https://rinkeby.infura.io/v3/c60b0bb42f8a4c6481ecd229eddaca27")
-            .unwrap();
 
     let chain_id = provider.get_chainid().await.unwrap();
     let wallet = WALLETS.next().with_chain_id(chain_id.as_u64());

ethers-providers/Cargo.toml

@@ -39,6 +39,7 @@ tracing = { version = "0.1.32", default-features = false }
 tracing-futures = { version = "0.2.5", default-features = false, features = ["std-future"] }
 
 bytes = { version  = "1.1.0", default-features = false, optional = true }
+once_cell = "1.10.0"
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 # tokio

ethers-providers/src/lib.rs

@@ -657,3 +657,63 @@ pub trait CeloMiddleware: Middleware {
         self.provider().get_validators_bls_public_keys(block_id).await.map_err(FromErr::from)
     }
 }
+
+pub use test_provider::{GOERLI, MAINNET, RINKEBY, ROPSTEN};
+
+/// Pre-instantiated Infura HTTP clients which rotate through multiple API keys
+/// to prevent rate limits
+pub mod test_provider {
+    use super::*;
+    use crate::Http;
+    use once_cell::sync::Lazy;
+    use std::{convert::TryFrom, iter::Cycle, slice::Iter, sync::Mutex};
+
+    // List of infura keys to rotate through so we don't get rate limited
+    const INFURA_KEYS: &[&str] = &[
+        "6770454bc6ea42c58aac12978531b93f",
+        "7a8769b798b642f6933f2ed52042bd70",
+        "631fd9a6539644088297dc605d35fff3",
+        "16a8be88795540b9b3903d8de0f7baa5",
+        "f4a0bdad42674adab5fc0ac077ffab2b",
+        "5c812e02193c4ba793f8c214317582bd",
+    ];
+
+    pub static RINKEBY: Lazy<TestProvider> =
+        Lazy::new(|| TestProvider::new(INFURA_KEYS, "rinkeby"));
+    pub static MAINNET: Lazy<TestProvider> =
+        Lazy::new(|| TestProvider::new(INFURA_KEYS, "mainnet"));
+    pub static GOERLI: Lazy<TestProvider> = Lazy::new(|| TestProvider::new(INFURA_KEYS, "goerli"));
+    pub static ROPSTEN: Lazy<TestProvider> =
+        Lazy::new(|| TestProvider::new(INFURA_KEYS, "ropsten"));
+
+    #[derive(Debug)]
+    pub struct TestProvider {
+        network: String,
+        keys: Mutex<Cycle<Iter<'static, &'static str>>>,
+    }
+
+    impl TestProvider {
+        pub fn new(keys: &'static [&'static str], network: &str) -> Self {
+            Self { keys: Mutex::new(keys.iter().cycle()), network: network.to_owned() }
+        }
+
+        pub fn provider(&self) -> Provider<Http> {
+            let url = format!(
+                "https://{}.infura.io/v3/{}",
+                self.network,
+                self.keys.lock().unwrap().next().unwrap()
+            );
+            Provider::try_from(url.as_str()).unwrap()
+        }
+
+        #[cfg(feature = "ws")]
+        pub async fn ws(&self) -> Provider<crate::Ws> {
+            let url = format!(
+                "wss://{}.infura.io/ws/v3/{}",
+                self.network,
+                self.keys.lock().unwrap().next().unwrap()
+            );
+            Provider::connect(url.as_str()).await.unwrap()
+        }
+    }
+}

ethers-providers/src/provider.rs

@@ -1488,12 +1488,10 @@ mod tests {
     };
     use futures_util::StreamExt;
 
-    const INFURA: &str = "https://mainnet.infura.io/v3/c60b0bb42f8a4c6481ecd229eddaca27";
-
     #[tokio::test]
     // Test vector from: https://docs.ethers.io/ethers.js/v5-beta/api-providers.html#id2
     async fn mainnet_resolve_name() {
-        let provider = Provider::<HttpProvider>::try_from(INFURA).unwrap();
+        let provider = crate::test_provider::MAINNET.provider();
 
         let addr = provider.resolve_name("registrar.firefly.eth").await.unwrap();
         assert_eq!(addr, "6fC21092DA55B392b045eD78F4732bff3C580e2c".parse().unwrap());
@@ -1508,7 +1506,7 @@ mod tests {
     #[tokio::test]
     // Test vector from: https://docs.ethers.io/ethers.js/v5-beta/api-providers.html#id2
     async fn mainnet_lookup_address() {
-        let provider = Provider::<HttpProvider>::try_from(INFURA).unwrap();
+        let provider = crate::MAINNET.provider();
 
         let name = provider
             .lookup_address("6fC21092DA55B392b045eD78F4732bff3C580e2c".parse().unwrap())
@@ -1525,7 +1523,7 @@ mod tests {
 
     #[tokio::test]
     async fn mainnet_resolve_avatar() {
-        let provider = Provider::<HttpProvider>::try_from(INFURA).unwrap();
+        let provider = crate::MAINNET.provider();
 
         for (ens_name, res) in &[
             // HTTPS

ethers-providers/src/transports/mod.rs

@@ -22,7 +22,7 @@ macro_rules! if_not_wasm {
 #[cfg(all(target_family = "unix", feature = "ipc"))]
 mod ipc;
 #[cfg(all(target_family = "unix", feature = "ipc"))]
-pub use ipc::Ipc;
+pub use ipc::{Ipc, IpcError};
 
 mod http;
 pub use self::http::{ClientError as HttpClientError, Provider as Http};
@@ -34,7 +34,7 @@ pub use ws::{ClientError as WsClientError, Ws};
 
 mod quorum;
 pub(crate) use quorum::JsonRpcClientWrapper;
-pub use quorum::{Quorum, QuorumProvider, WeightedProvider};
+pub use quorum::{Quorum, QuorumError, QuorumProvider, WeightedProvider};
 
 mod mock;
 pub use mock::{MockError, MockProvider};

ethers-providers/src/transports/ws.rs

@@ -62,8 +62,7 @@ if_not_wasm! {
     use super::Authorization;
     use tracing::{debug, error, warn};
     use http::Request as HttpRequest;
-    use http::Uri;
+    use tungstenite::client::IntoClientRequest;
-    use std::str::FromStr;
 }
 
 type Pending = oneshot::Sender<Result<serde_json::Value, JsonRpcError>>;
@@ -137,9 +136,7 @@ impl Ws {
 
     /// Initializes a new WebSocket Client
     #[cfg(not(target_arch = "wasm32"))]
-    pub async fn connect(
+    pub async fn connect(url: impl IntoClientRequest + Unpin) -> Result<Self, ClientError> {
-        url: impl tungstenite::client::IntoClientRequest + Unpin,
-    ) -> Result<Self, ClientError> {
         let (ws, _) = connect_async(url).await?;
         Ok(Self::new(ws))
     }
@@ -147,11 +144,10 @@ impl Ws {
     /// Initializes a new WebSocket Client with authentication
     #[cfg(not(target_arch = "wasm32"))]
     pub async fn connect_with_auth(
-        uri: impl AsRef<str> + Unpin,
+        uri: impl IntoClientRequest + Unpin,
         auth: Authorization,
     ) -> Result<Self, ClientError> {
-        let mut request: HttpRequest<()> =
+        let mut request: HttpRequest<()> = uri.into_client_request()?;
-            HttpRequest::builder().method("GET").uri(Uri::from_str(uri.as_ref())?).body(())?;
 
         let mut auth_value = http::HeaderValue::from_str(&auth.to_string())?;
         auth_value.set_sensitive(true);

ethers-providers/tests/provider.rs

@@ -1,5 +1,5 @@
 #![cfg(not(target_arch = "wasm32"))]
-use ethers_providers::{Http, Middleware, Provider};
+use ethers_providers::{Http, Middleware, Provider, RINKEBY};
 use std::{convert::TryFrom, time::Duration};
 
 #[cfg(not(feature = "celo"))]
@@ -12,10 +12,7 @@ mod eth_tests {
 
     #[tokio::test]
     async fn non_existing_data_works() {
-        let provider = Provider::<Http>::try_from(
+        let provider = RINKEBY.provider();
-            "https://rinkeby.infura.io/v3/c60b0bb42f8a4c6481ecd229eddaca27",
-        )
-        .unwrap();
 
         assert!(provider.get_transaction(H256::zero()).await.unwrap().is_none());
         assert!(provider.get_transaction_receipt(H256::zero()).await.unwrap().is_none());
@@ -25,10 +22,7 @@ mod eth_tests {
 
     #[tokio::test]
     async fn client_version() {
-        let provider = Provider::<Http>::try_from(
+        let provider = RINKEBY.provider();
-            "https://rinkeby.infura.io/v3/c60b0bb42f8a4c6481ecd229eddaca27",
-        )
-        .unwrap();
 
         // e.g., Geth/v1.10.6-omnibus-1af33248/linux-amd64/go1.16.6
         assert!(provider
@@ -41,11 +35,7 @@ mod eth_tests {
     // Without TLS this would error with "TLS Support not compiled in"
     #[tokio::test]
     async fn ssl_websocket() {
-        use ethers_providers::Ws;
+        let provider = RINKEBY.ws().await;
-        let ws = Ws::connect("wss://rinkeby.infura.io/ws/v3/c60b0bb42f8a4c6481ecd229eddaca27")
-            .await
-            .unwrap();
-        let provider = Provider::new(ws);
         let _number = provider.get_block_number().await.unwrap();
     }
 
@@ -95,10 +85,7 @@ mod eth_tests {
 
     #[tokio::test]
     async fn eip1559_fee_estimation() {
-        let provider = Provider::<Http>::try_from(
+        let provider = ethers_providers::MAINNET.provider();
-            "https://mainnet.infura.io/v3/c60b0bb42f8a4c6481ecd229eddaca27",
-        )
-        .unwrap();
 
         let (_max_fee_per_gas, _max_priority_fee_per_gas) =
             provider.estimate_eip1559_fees(None).await.unwrap();

ethers-solc/Cargo.toml

@@ -53,7 +53,7 @@ criterion = { version = "0.3", features = ["async_tokio"] }
 env_logger = "*"
 tracing-subscriber = {version = "0.3", default-features = false, features = ["env-filter", "fmt"]}
 rand = "0.8.5"
-pretty_assertions = "1.1.0"
+pretty_assertions = "1.2.0"
 tempfile = "3.3.0"
 tokio = { version = "1.15.0", features = ["full"] }
 

ethers-solc/src/cache.rs

@@ -29,7 +29,7 @@ const ETHERS_FORMAT_VERSION: &str = "ethers-rs-sol-cache-2";
 /// The file name of the default cache file
 pub const SOLIDITY_FILES_CACHE_FILENAME: &str = "solidity-files-cache.json";
 
-/// A hardhat compatible cache representation
+/// A multi version cache file
 #[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize)]
 pub struct SolFilesCache {
     #[serde(rename = "_format")]
@@ -593,62 +593,35 @@ impl<'a, T: ArtifactOutput> ArtifactsCacheInner<'a, T> {
         }
     }
 
-    /// Returns only dirty sources that:
+    /// Returns only those sources that
     ///   - are new
     ///   - were changed
     ///   - their imports were changed
     ///   - their artifact is missing
-    /// This also includes their respective imports
     fn filter(&mut self, sources: Sources, version: &Version) -> Sources {
         self.fill_hashes(&sources);
-
+        sources
-        let mut imports_of_dirty = HashSet::new();
-        // separates all source files that fit the criteria (dirty) from those that don't (clean)
-        let (mut dirty_sources, clean_sources) = sources
             .into_iter()
-            .map(|(file, source)| self.filter_source(file, source, version))
+            .filter_map(|(file, source)| self.requires_solc(file, source, version))
-            .fold(
+            .collect()
-                (Sources::default(), Vec::new()),
-                |(mut dirty_sources, mut clean_sources), source| {
-                    if source.dirty {
-                        // mark all files that are imported by a dirty file
-                        imports_of_dirty.extend(self.edges.all_imported_nodes(source.idx));
-                        dirty_sources.insert(source.file, source.source);
-                    } else {
-                        clean_sources.push(source);
-                    }
-
-                    (dirty_sources, clean_sources)
-                },
-            );
-
-        for clean_source in clean_sources {
-            let FilteredSource { file, source, idx, .. } = clean_source;
-            if imports_of_dirty.contains(&idx) {
-                // file is imported by a dirty file
-                dirty_sources.insert(file, source);
-            } else {
-                self.insert_filtered_source(file, source, version.clone());
-            }
-        }
-
-        // track dirty sources internally
-        for (file, source) in dirty_sources.iter() {
-            self.insert_new_cache_entry(file, source, version.clone());
-        }
-
-        dirty_sources
     }
 
-    /// Returns the state of the given source file.
+    /// Returns `Some` if the file _needs_ to be compiled and `None` if the artifact can be reu-used
-    fn filter_source(&self, file: PathBuf, source: Source, version: &Version) -> FilteredSource {
+    fn requires_solc(
-        let idx = self.edges.node_id(&file);
+        &mut self,
+        file: PathBuf,
+        source: Source,
+        version: &Version,
+    ) -> Option<(PathBuf, Source)> {
         if !self.is_dirty(&file, version) &&
             self.edges.imports(&file).iter().all(|file| !self.is_dirty(file, version))
         {
-            FilteredSource { file, source, idx, dirty: false }
+            self.insert_filtered_source(file, source, version.clone());
+            None
         } else {
-            FilteredSource { file, source, idx, dirty: true }
+            self.insert_new_cache_entry(&file, &source, version.clone());
+
+            Some((file, source))
         }
     }
 
@@ -665,23 +638,28 @@ impl<'a, T: ArtifactOutput> ArtifactsCacheInner<'a, T> {
                     return true
                 }
 
-                if !entry.contains_version(version) {
+                // only check artifact's existence if the file generated artifacts.
-                    tracing::trace!(
+                // e.g. a solidity file consisting only of import statements (like interfaces that
-                        "missing linked artifacts for source file `{}` for version \"{}\"",
+                // re-export) do not create artifacts
-                        file.display(),
+                if !entry.artifacts.is_empty() {
-                        version
+                    if !entry.contains_version(version) {
-                    );
+                        tracing::trace!(
-                    return true
+                            "missing linked artifacts for source file `{}` for version \"{}\"",
-                }
+                            file.display(),
-
+                            version
-                if entry.artifacts_for_version(version).any(|artifact_path| {
+                        );
-                    let missing_artifact = !self.cached_artifacts.has_artifact(artifact_path);
+                        return true
-                    if missing_artifact {
+                    }
-                        tracing::trace!("missing artifact \"{}\"", artifact_path.display());
+
+                    if entry.artifacts_for_version(version).any(|artifact_path| {
+                        let missing_artifact = !self.cached_artifacts.has_artifact(artifact_path);
+                        if missing_artifact {
+                            tracing::trace!("missing artifact \"{}\"", artifact_path.display());
+                        }
+                        missing_artifact
+                    }) {
+                        return true
                     }
-                    missing_artifact
-                }) {
-                    return true
                 }
                 // all things match, can be reused
                 return false
@@ -701,14 +679,6 @@ impl<'a, T: ArtifactOutput> ArtifactsCacheInner<'a, T> {
     }
 }
 
-/// Helper type to represent the state of a source file
-struct FilteredSource {
-    file: PathBuf,
-    source: Source,
-    idx: usize,
-    dirty: bool,
-}
-
 /// Abstraction over configured caching which can be either non-existent or an already loaded cache
 #[allow(clippy::large_enum_variant)]
 #[derive(Debug)]

ethers-solc/src/compile/mod.rs

@@ -372,9 +372,16 @@ impl Solc {
     pub fn blocking_install(version: &Version) -> std::result::Result<(), svm::SolcVmError> {
         tracing::trace!("blocking installing solc version \"{}\"", version);
         crate::report::solc_installation_start(version);
-        svm::blocking_install(version)?;
+        match svm::blocking_install(version) {
-        crate::report::solc_installation_success(version);
+            Ok(_) => {
-        Ok(())
+                crate::report::solc_installation_success(version);
+                Ok(())
+            }
+            Err(err) => {
+                crate::report::solc_installation_error(version, &err.to_string());
+                Err(err)
+            }
+        }
     }
 
     /// Verify that the checksum for this version of solc is correct. We check against the SHA256

ethers-solc/src/compile/project.rs

@@ -73,6 +73,33 @@
 //! file in the VFS under `dapp-bin/library/math.sol`. If the file is not available there, the
 //! source unit name will be passed to the Host Filesystem Loader, which will then look in
 //! `/project/dapp-bin/library/iterable_mapping.sol`
+//!
+//!
+//! ### Caching and Change detection
+//!
+//! If caching is enabled in the [Project](crate::Project) a cache file will be created upon a
+//! successful solc build. The [cache file](crate::SolFilesCache) stores metadata for all the files
+//! that were provided to solc.
+//! For every file the cache file contains a dedicated [cache
+//! entry](crate::CacheEntry), which represents the state of the file. A solidity file can contain
+//! several contracts, for every contract a separate [artifact](crate::Artifact) is emitted.
+//! Therefor the entry also tracks all artifacts emitted by a file. A solidity file can also be
+//! compiled with several solc versions.
+//!
+//! For example in `A(<=0.8.10) imports C(>0.4.0)` and
+//! `B(0.8.11) imports C(>0.4.0)`, both `A` and `B` import `C` but there's no solc version that's
+//! compatible with `A` and `B`, in which case two sets are compiled: [`A`, `C`] and [`B`, `C`].
+//! This is reflected in the cache entry which tracks the file's artifacts by version.
+//!
+//! The cache makes it possible to detect changes during recompilation, so that only the changed,
+//! dirty, files need to be passed to solc. A file will be considered as dirty if:
+//!   - the file is new, not included in the existing cache
+//!   - the file was modified since the last compiler run, detected by comparing content hashes
+//!   - any of the imported files is dirty
+//!   - the file's artifacts don't exist, were deleted.
+//!
+//! Recompiling a project with cache enabled detects all files that meet these criteria and provides
+//! solc with only these dirty files instead of the entire source set.
 
 use crate::{
     artifact_output::Artifacts,
@@ -283,7 +310,13 @@ impl CompilerSources {
             sources
                 .into_iter()
                 .map(|(solc, (version, sources))| {
+                    tracing::trace!("Filtering {} sources for {}", sources.len(), version);
                     let sources = cache.filter(sources, &version);
+                    tracing::trace!(
+                        "Detected {} dirty sources {:?}",
+                        sources.len(),
+                        sources.keys()
+                    );
                     (solc, (version, sources))
                 })
                 .collect()

ethers-solc/src/remappings.rs

@@ -661,7 +661,7 @@ mod tests {
         assert_eq!(relative.path.original(), Path::new(&remapping.path));
         assert!(relative.path.parent.is_none());
 
-        let relative = RelativeRemapping::new(remapping.clone(), "/a/b");
+        let relative = RelativeRemapping::new(remapping, "/a/b");
         assert_eq!(relative.to_relative_remapping(), Remapping::from_str("oz/=c/d/").unwrap());
     }
 

ethers-solc/src/report.rs

@@ -14,7 +14,7 @@
 
 // https://github.com/tokio-rs/tracing/blob/master/tracing-core/src/dispatch.rs
 
-use crate::{CompilerInput, CompilerOutput, Solc};
+use crate::{remappings::Remapping, CompilerInput, CompilerOutput, Solc};
 use semver::Version;
 use std::{
     any::{Any, TypeId},
@@ -99,11 +99,14 @@ pub trait Reporter: 'static {
     /// Invoked before a new [`Solc`] bin is installed
     fn on_solc_installation_start(&self, _version: &Version) {}
 
-    /// Invoked before a new [`Solc`] bin was successfully installed
+    /// Invoked after a new [`Solc`] bin was successfully installed
     fn on_solc_installation_success(&self, _version: &Version) {}
 
-    /// Invoked if the import couldn't be resolved
+    /// Invoked after a [`Solc`] installation failed
-    fn on_unresolved_import(&self, _import: &Path) {}
+    fn on_solc_installation_error(&self, _version: &Version, _error: &str) {}
+
+    /// Invoked if the import couldn't be resolved with these remappings
+    fn on_unresolved_import(&self, _import: &Path, _remappings: &[Remapping]) {}
 
     /// If `self` is the same type as the provided `TypeId`, returns an untyped
     /// [`NonNull`] pointer to that type. Otherwise, returns `None`.
@@ -166,8 +169,13 @@ pub(crate) fn solc_installation_success(version: &Version) {
     get_default(|r| r.reporter.on_solc_installation_success(version));
 }
 
-pub(crate) fn unresolved_import(import: &Path) {
+#[allow(unused)]
-    get_default(|r| r.reporter.on_unresolved_import(import));
+pub(crate) fn solc_installation_error(version: &Version, error: &str) {
+    get_default(|r| r.reporter.on_solc_installation_error(version, error));
+}
+
+pub(crate) fn unresolved_import(import: &Path, remappings: &[Remapping]) {
+    get_default(|r| r.reporter.on_unresolved_import(import, remappings));
 }
 
 fn get_global() -> Option<&'static Report> {
@@ -308,8 +316,16 @@ impl Reporter for BasicStdoutReporter {
         println!("Successfully installed solc {}", version);
     }
 
-    fn on_unresolved_import(&self, import: &Path) {
+    fn on_solc_installation_error(&self, version: &Version, error: &str) {
-        println!("Unable to resolve imported file: \"{}\"", import.display());
+        eprintln!("Failed to install solc {}: {}", version, error);
+    }
+
+    fn on_unresolved_import(&self, import: &Path, remappings: &[Remapping]) {
+        println!(
+            "Unable to resolve import: \"{}\" with remappings:\n    {}",
+            import.display(),
+            remappings.iter().map(|r| r.to_string()).collect::<Vec<_>>().join("\n    ")
+        );
     }
 }
 

ethers-solc/src/resolver/mod.rs

@@ -274,7 +274,7 @@ impl Graph {
                         add_node(&mut unresolved, &mut index, &mut resolved_imports, import)?;
                     }
                     Err(err) => {
-                        crate::report::unresolved_import(import.data());
+                        crate::report::unresolved_import(import.data(), &paths.remappings);
                         tracing::trace!("failed to resolve import component \"{:?}\"", err)
                     }
                 };

ethers-solc/tests/project.rs

@@ -685,3 +685,51 @@ fn can_recompile_with_changes() {
     assert!(compiled.find("A").is_some());
     assert!(compiled.find("B").is_some());
 }
+
+#[test]
+fn can_recompile_unchanged_with_empty_files() {
+    let tmp = TempProject::dapptools().unwrap();
+
+    tmp.add_source(
+        "A",
+        r#"
+    pragma solidity ^0.8.10;
+    import "./B.sol";
+    contract A {}
+   "#,
+    )
+    .unwrap();
+
+    tmp.add_source(
+        "B",
+        r#"
+    pragma solidity ^0.8.10;
+    import "./C.sol";
+   "#,
+    )
+    .unwrap();
+
+    let c = r#"
+    pragma solidity ^0.8.10;
+    contract C {}
+   "#;
+    tmp.add_source("C", c).unwrap();
+
+    let compiled = tmp.compile().unwrap();
+    assert!(!compiled.has_compiler_errors());
+    assert!(compiled.find("A").is_some());
+    assert!(compiled.find("C").is_some());
+
+    let compiled = tmp.compile().unwrap();
+    assert!(compiled.find("A").is_some());
+    assert!(compiled.find("C").is_some());
+    assert!(compiled.is_unchanged());
+
+    // modify C.sol
+    tmp.add_source("C", format!("{}\n", c)).unwrap();
+    let compiled = tmp.compile().unwrap();
+    assert!(!compiled.has_compiler_errors());
+    assert!(!compiled.is_unchanged());
+    assert!(compiled.find("A").is_some());
+    assert!(compiled.find("C").is_some());
+}

examples/contract_human_readable.rs

@@ -30,7 +30,7 @@ async fn main() -> Result<()> {
     let project = Project::builder().paths(paths).ephemeral().no_artifacts().build().unwrap();
     // compile the project and get the artifacts
     let output = project.compile().unwrap();
-    let contract = output.find("SimpleStorage").expect("could not find contract").into_owned();
+    let contract = output.find("SimpleStorage").expect("could not find contract").clone();
     let (abi, bytecode, _) = contract.into_parts_or_default();
 
     // 2. instantiate our wallet & ganache