impl From for Status/SealedHeader (#927)

crates/net/eth-wire/src/types/status.rs

@@ -1,7 +1,11 @@
 use crate::{EthVersion, StatusBuilder};
 
+use ethers_core::utils::Genesis;
 use reth_codecs::derive_arbitrary;
-use reth_primitives::{Chain, ForkId, Hardfork, H256, MAINNET, U256};
+use reth_primitives::{
+    constants::EIP1559_INITIAL_BASE_FEE, Chain, ChainSpec, ForkId, Hardfork, Header, H256, MAINNET,
+    U256,
+};
 use reth_rlp::{RlpDecodable, RlpEncodable};
 use serde::{Deserialize, Serialize};
 use std::fmt::{Debug, Display};
@@ -39,6 +43,40 @@ pub struct Status {
     pub forkid: ForkId,
 }
 
+impl From<Genesis> for Status {
+    fn from(genesis: Genesis) -> Status {
+        let chain = genesis.config.chain_id;
+        let total_difficulty = genesis.difficulty.into();
+        let mut chainspec = ChainSpec::from(genesis);
+        let mut header = Header::from(chainspec.genesis().clone());
+
+        let hardforks = chainspec.hardforks();
+
+        // set initial base fee depending on eip-1559
+        if Some(&0u64) == hardforks.get(&Hardfork::London) {
+            header.base_fee_per_gas = Some(EIP1559_INITIAL_BASE_FEE);
+        }
+
+        // calculate the hash
+        let sealed_header = header.seal();
+
+        // set the new genesis hash after modifying the base fee
+        chainspec.genesis_hash = sealed_header.hash();
+
+        // we need to calculate the fork id AFTER re-setting the genesis hash
+        let forkid = chainspec.fork_id(0);
+
+        Status {
+            version: EthVersion::Eth67 as u8,
+            chain: Chain::Id(chain),
+            total_difficulty,
+            blockhash: sealed_header.hash(),
+            genesis: sealed_header.hash(),
+            forkid,
+        }
+    }
+}
+
 impl Status {
     /// Helper for returning a builder for the status message.
     pub fn builder() -> StatusBuilder {