feat: support no_std for ethereum-forks (paradigmxyz#8877)

Co-authored-by: Matthias Seitz <[email protected]>

crates/ethereum-forks/Cargo.toml

@@ -22,7 +22,7 @@ crc = "3"
 
 # misc
 serde = { workspace = true, features = ["derive"], optional = true }
-thiserror.workspace = true
+thiserror-no-std = { workspace = true, default-features = false }
 
 # arbitrary utils
 arbitrary = { workspace = true, features = ["derive"], optional = true }
@@ -35,7 +35,8 @@ proptest.workspace = true
 proptest-derive.workspace = true
 
 [features]
-default = ["serde"]
+default = ["std", "serde"]
+std = ["thiserror-no-std/std"]
 serde = ["dep:serde"]
 arbitrary = ["dep:arbitrary", "dep:proptest", "dep:proptest-derive"]
 optimism = []

crates/ethereum-forks/src/forkid.rs

@@ -3,22 +3,27 @@
 //! Previously version of Apache licenced [`ethereum-forkid`](https://crates.io/crates/ethereum-forkid).
 
 use crate::Head;
+#[cfg(not(feature = "std"))]
+use alloc::{
+    collections::{BTreeMap, BTreeSet},
+    vec::Vec,
+};
 use alloy_primitives::{hex, BlockNumber, B256};
 use alloy_rlp::{Error as RlpError, *};
 #[cfg(any(test, feature = "arbitrary"))]
 use arbitrary::Arbitrary;
+use core::{
+    cmp::Ordering,
+    fmt,
+    ops::{Add, AddAssign},
+};
 use crc::*;
 #[cfg(any(test, feature = "arbitrary"))]
 use proptest_derive::Arbitrary as PropTestArbitrary;
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
-use std::{
-    cmp::Ordering,
-    collections::{BTreeMap, BTreeSet},
-    fmt,
-    ops::{Add, AddAssign},
-};
-use thiserror::Error;
+#[cfg(feature = "std")]
+use std::collections::{BTreeMap, BTreeSet};
 
 const CRC_32_IEEE: Crc<u32> = Crc::<u32>::new(&CRC_32_ISO_HDLC);
 const TIMESTAMP_BEFORE_ETHEREUM_MAINNET: u64 = 1_300_000_000;
@@ -174,7 +179,7 @@ impl From<EnrForkIdEntry> for ForkId {
 }
 
 /// Reason for rejecting provided `ForkId`.
-#[derive(Clone, Copy, Debug, Error, PartialEq, Eq, Hash)]
+#[derive(Clone, Copy, Debug, thiserror_no_std::Error, PartialEq, Eq, Hash)]
 pub enum ValidationError {
     /// Remote node is outdated and needs a software update.
     #[error(

crates/ethereum-forks/src/hardfork.rs

@@ -1,7 +1,14 @@
 use alloy_chains::Chain;
+use core::{
+    fmt,
+    fmt::{Display, Formatter},
+    str::FromStr,
+};
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
-use std::{fmt::Display, str::FromStr};
+
+#[cfg(not(feature = "std"))]
+use alloc::{format, string::String};
 
 /// Represents the consensus type of a blockchain fork.
 ///
@@ -562,7 +569,7 @@ impl FromStr for Hardfork {
 }
 
 impl Display for Hardfork {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         write!(f, "{self:?}")
     }
 }

crates/ethereum-forks/src/head.rs

@@ -1,7 +1,7 @@
 use alloy_primitives::{BlockNumber, B256, U256};
+use core::fmt;
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
-use std::fmt;
 
 /// Describes the current head block.
 ///

crates/ethereum-forks/src/lib.rs

@@ -15,6 +15,10 @@
 // TODO: remove when https://github.com/proptest-rs/proptest/pull/427 is merged
 #![allow(unknown_lints, non_local_definitions)]
 #![cfg_attr(docsrs, feature(doc_cfg, doc_auto_cfg))]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg(not(feature = "std"))]
+extern crate alloc;
 
 mod forkid;
 mod hardfork;