feat: add Hardfork::Cancun (#3933)

Co-authored-by: Dan Cline <6798349+Rjected@users.noreply.github.com>

bin/reth/src/init.rs

@@ -269,7 +269,7 @@ mod tests {
                 ..Default::default()
             },
             hardforks: BTreeMap::default(),
-            fork_timestamps: ForkTimestamps { shanghai: None },
+            fork_timestamps: ForkTimestamps::default(),
             genesis_hash: None,
             paris_block_and_final_difficulty: None,
         });

crates/primitives/src/chain/spec.rs

@@ -306,6 +306,15 @@ impl ChainSpec {
             .unwrap_or_else(|| self.is_fork_active_at_timestamp(Hardfork::Shanghai, timestamp))
     }
 
+    /// Convenience method to check if [Hardfork::Cancun] is active at a given timestamp.
+    #[inline]
+    pub fn is_cancun_activated_at_timestamp(&self, timestamp: u64) -> bool {
+        self.fork_timestamps
+            .cancun
+            .map(|cancun| timestamp >= cancun)
+            .unwrap_or_else(|| self.is_fork_active_at_timestamp(Hardfork::Cancun, timestamp))
+    }
+
     /// Creates a [`ForkFilter`](crate::ForkFilter) for the block described by [Head].
     pub fn fork_filter(&self, head: Head) -> ForkFilter {
         let forks = self.forks_iter().filter_map(|(_, condition)| {
@@ -433,6 +442,8 @@ impl From<Genesis> for ChainSpec {
 pub struct ForkTimestamps {
     /// The timestamp of the shanghai fork
     pub shanghai: Option<u64>,
+    /// The timestamp of the cancun fork
+    pub cancun: Option<u64>,
 }
 
 impl ForkTimestamps {
@@ -442,6 +453,9 @@ impl ForkTimestamps {
         if let Some(shanghai) = forks.get(&Hardfork::Shanghai).and_then(|f| f.as_timestamp()) {
             timestamps = timestamps.shanghai(shanghai);
         }
+        if let Some(cancun) = forks.get(&Hardfork::Cancun).and_then(|f| f.as_timestamp()) {
+            timestamps = timestamps.cancun(cancun);
+        }
         timestamps
     }
 
@@ -450,6 +464,12 @@ impl ForkTimestamps {
         self.shanghai = Some(shanghai);
         self
     }
+
+    /// Sets the given cancun timestamp
+    pub fn cancun(mut self, cancun: u64) -> Self {
+        self.cancun = Some(cancun);
+        self
+    }
 }
 
 /// A helper type for compatibility with geth's config
@@ -614,6 +634,13 @@ impl ChainSpecBuilder {
         self
     }
 
+    /// Enable Cancun at genesis.
+    pub fn cancun_activated(mut self) -> Self {
+        self = self.paris_activated();
+        self.hardforks.insert(Hardfork::Cancun, ForkCondition::Timestamp(0));
+        self
+    }
+
     /// Build the resulting [`ChainSpec`].
     ///
     /// # Panics

crates/primitives/src/hardfork.rs

@@ -39,6 +39,8 @@ pub enum Hardfork {
     Paris,
     /// Shanghai.
     Shanghai,
+    /// Cancun.
+    Cancun,
 }
 
 impl Hardfork {
@@ -82,6 +84,7 @@ impl FromStr for Hardfork {
             "grayglacier" => Hardfork::GrayGlacier,
             "paris" => Hardfork::Paris,
             "shanghai" => Hardfork::Shanghai,
+            "cancun" => Hardfork::Cancun,
             _ => return Err(format!("Unknown hardfork: {s}")),
         };
         Ok(hardfork)
@@ -97,7 +100,6 @@ impl Display for Hardfork {
 #[cfg(test)]
 mod tests {
     use super::*;
-
     use crate::{Chain, Genesis};
     use std::collections::BTreeMap;
 
@@ -120,6 +122,7 @@ mod tests {
             "grayglacier",
             "PARIS",
             "ShAnGhAI",
+            "CaNcUn",
         ];
         let expected_hardforks = [
             Hardfork::Frontier,
@@ -138,6 +141,7 @@ mod tests {
             Hardfork::GrayGlacier,
             Hardfork::Paris,
             Hardfork::Shanghai,
+            Hardfork::Cancun,
         ];
 
         let hardforks: Vec<Hardfork> =