feat: support no_std for alloy-eips (#181)

* refactor: support no_std for alloy-eips

* fix: disable arbitrary when no_std

* fix: clippy redundant import

---------

Co-authored-by: James <[email protected]>

Cargo.toml

@@ -88,10 +88,11 @@ rand = "0.8"
 reqwest = { version = "0.11", default-features = false }
 semver = "1.0"
 thiserror = "1.0"
+thiserror-no-std = "2.0.2"
 url = "2.5"
 
 ## serde
-serde = { version = "1.0", features = ["derive"] }
+serde = { version = "1.0", features = ["derive"], default-features = false }
 serde_json = "1.0"
 
 ## misc-testing

crates/eips/Cargo.toml

@@ -12,13 +12,11 @@ repository.workspace = true
 exclude.workspace = true
 
 [dependencies]
-alloy-primitives = { workspace = true, features = ["rlp"] }
+alloy-primitives = { workspace = true, features = ["rlp"], default-features = false }
 alloy-rlp = { workspace = true, features = ["derive"] }
 
-thiserror.workspace = true
-
 # serde
-serde = { workspace = true, optional = true }
+serde = { workspace = true, default-features = false, optional = true }
 
 # arbitrary
 arbitrary = { workspace = true, features = ["derive"], optional = true }
@@ -31,5 +29,12 @@ proptest = { workspace = true }
 proptest-derive = { workspace = true }
 
 [features]
+default = ["std"]
+std = [
+    "alloy-primitives/std",
+    "alloy-rlp/std",
+
+    "serde/std",
+]
 serde = ["dep:serde", "alloy-primitives/serde"]
-arbitrary = ["dep:arbitrary", "dep:proptest-derive", "dep:proptest", "alloy-primitives/arbitrary"]
+arbitrary = ["std", "dep:arbitrary", "dep:proptest-derive", "dep:proptest", "alloy-primitives/arbitrary"]

crates/eips/src/eip2718.rs

@@ -2,28 +2,48 @@
 //!
 //! [EIP-2718]: https://eips.ethereum.org/EIPS/eip-2718
 
+#[cfg(not(feature = "std"))]
+use crate::alloc::{vec, vec::Vec};
+
 use alloy_primitives::{keccak256, Sealed, B256};
 use alloy_rlp::{BufMut, Header, EMPTY_STRING_CODE};
+use core::{
+    fmt,
+    fmt::{Display, Formatter},
+};
 
 // https://eips.ethereum.org/EIPS/eip-2718#transactiontype-only-goes-up-to-0x7f
 const TX_TYPE_BYTE_MAX: u8 = 0x7f;
 
 /// [EIP-2718] decoding errors.
 ///
 /// [EIP-2718]: https://eips.ethereum.org/EIPS/eip-2718
-#[derive(thiserror::Error, Debug)]
+#[derive(Debug, Copy, Clone)]
 pub enum Eip2718Error {
     /// Rlp error from [`alloy_rlp`].
-    #[error(transparent)]
-    RlpError(#[from] alloy_rlp::Error),
+    RlpError(alloy_rlp::Error),
     /// Got an unexpected type flag while decoding.
-    #[error("Unexpected type flag. Got {0}.")]
     UnexpectedType(u8),
-    /// Some other error occurred.
-    #[error(transparent)]
-    Custom(#[from] Box<dyn std::error::Error>),
 }
 
+impl Display for Eip2718Error {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::RlpError(err) => write!(f, "{err}"),
+            Self::UnexpectedType(t) => write!(f, "Unexpected type flag. Got {t}."),
+        }
+    }
+}
+
+impl From<alloy_rlp::Error> for Eip2718Error {
+    fn from(err: alloy_rlp::Error) -> Self {
+        Self::RlpError(err)
+    }
+}
+
+#[cfg(feature = "std")]
+impl std::error::Error for Eip2718Error {}
+
 /// Decoding trait for [EIP-2718] envelopes. These envelopes wrap a transaction
 /// or a receipt with a type flag.
 ///

crates/eips/src/eip2930.rs

@@ -4,15 +4,18 @@
 
 #![allow(unknown_lints, non_local_definitions)]
 
+#[cfg(not(feature = "std"))]
+pub(crate) use alloc::vec::Vec;
+
 use alloy_primitives::{Address, B256, U256};
 use alloy_rlp::{RlpDecodable, RlpDecodableWrapper, RlpEncodable, RlpEncodableWrapper};
-use std::mem;
+use core::mem;
 
 /// A list of addresses and storage keys that the transaction plans to access.
 /// Accesses outside the list are possible, but become more expensive.
 #[derive(Clone, Debug, PartialEq, Eq, Hash, Default, RlpDecodable, RlpEncodable)]
 #[cfg_attr(
-    any(test, feature = "arbitrary"),
+    all(any(test, feature = "arbitrary"), feature = "std"),
     derive(proptest_derive::Arbitrary, arbitrary::Arbitrary)
 )]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
@@ -22,7 +25,7 @@ pub struct AccessListItem {
     pub address: Address,
     /// Keys of storage that would be loaded at the start of execution
     #[cfg_attr(
-        any(test, feature = "arbitrary"),
+        all(any(test, feature = "arbitrary"), feature = "std"),
         proptest(
             strategy = "proptest::collection::vec(proptest::arbitrary::any::<B256>(), 0..=20)"
         )
@@ -41,12 +44,12 @@ impl AccessListItem {
 /// AccessList as defined in EIP-2930
 #[derive(Clone, Debug, PartialEq, Eq, Hash, Default, RlpDecodableWrapper, RlpEncodableWrapper)]
 #[cfg_attr(
-    any(test, feature = "arbitrary"),
+    all(any(test, feature = "arbitrary"), feature = "std"),
     derive(proptest_derive::Arbitrary, arbitrary::Arbitrary)
 )]
 pub struct AccessList(
     #[cfg_attr(
-        any(test, feature = "arbitrary"),
+        all(any(test, feature = "arbitrary"), feature = "std"),
         proptest(
             strategy = "proptest::collection::vec(proptest::arbitrary::any::<AccessListItem>(), 0..=20)"
         )

crates/eips/src/lib.rs

@@ -11,9 +11,13 @@
     clippy::missing_const_for_fn,
     rustdoc::all
 )]
-#![cfg_attr(not(test), warn(unused_crate_dependencies))]
 #![deny(unused_must_use, rust_2018_idioms)]
 #![cfg_attr(docsrs, feature(doc_cfg, doc_auto_cfg))]
+#![cfg_attr(feature = "arbitrary", cfg(feature = "std"))]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg(not(feature = "std"))]
+extern crate alloc;
 
 pub mod eip1559;
 pub use eip1559::calc_next_block_base_fee;

crates/eips/src/merge.rs

@@ -1,6 +1,6 @@
 //! Constants related to the beacon chain consensus.
 
-use std::time::Duration;
+use core::time::Duration;
 
 /// An EPOCH is a series of 32 slots.
 pub const EPOCH_SLOTS: u64 = 32;

crates/rpc-types/Cargo.toml

@@ -14,7 +14,7 @@ exclude.workspace = true
 [dependencies]
 # ethereum
 alloy-rlp = { workspace = true, features = ["arrayvec", "derive"] }
-alloy-primitives = { workspace = true, features = ["rlp", "serde"] }
+alloy-primitives = { workspace = true, features = ["rlp", "serde", "std"] }
 alloy-serde.workspace = true
 
 ethereum_ssz_derive = { workspace = true, optional = true }