starknet_committer: define StarknetForestProofs serde

Author: ArielElp

crates/starknet_committer/src/patricia_merkle_tree/types.rs

@@ -1,12 +1,38 @@
 use std::collections::HashMap;
 
+#[cfg(feature = "os_input")]
+use ethnum::U256;
 use serde::{Deserialize, Serialize};
+#[cfg(feature = "os_input")]
+use starknet_api::core::Nonce;
 use starknet_api::core::{ClassHash, ContractAddress};
 use starknet_api::hash::HashOutput;
 use starknet_patricia::impl_from_hex_for_felt_wrapper;
 use starknet_patricia::patricia_merkle_tree::filled_tree::tree::FilledTreeImpl;
+#[cfg(feature = "os_input")]
+use starknet_patricia::patricia_merkle_tree::node_data::errors::{
+    EdgePathError,
+    PathToBottomError,
+};
 use starknet_patricia::patricia_merkle_tree::node_data::inner_node::PreimageMap;
+#[cfg(feature = "os_input")]
+use starknet_patricia::patricia_merkle_tree::node_data::inner_node::{
+    BinaryData,
+    EdgeData,
+    EdgePath,
+    EdgePathLength,
+    PathToBottom,
+    Preimage,
+};
 use starknet_patricia::patricia_merkle_tree::types::NodeIndex;
+#[cfg(feature = "os_input")]
+use starknet_patricia_storage::errors::{
+    DeserializationError,
+    SerializationError,
+    SerializationResult,
+};
+#[cfg(feature = "os_input")]
+use starknet_patricia_storage::storage_trait::DbValue;
 use starknet_types_core::felt::{Felt, FromStrError};
 
 use crate::block_committer::input::StarknetStorageValue;
@@ -48,17 +74,224 @@ pub struct StarknetForestProofs {
 }
 
 impl StarknetForestProofs {
-    pub(crate) fn extend(&mut self, other: Self) {
+    pub fn extend(&mut self, other: Self) {
         self.classes_trie_proof.extend(other.classes_trie_proof);
         self.contracts_trie_proof.nodes.extend(other.contracts_trie_proof.nodes);
         self.contracts_trie_proof.leaves.extend(other.contracts_trie_proof.leaves);
         for (address, proof) in other.contracts_trie_storage_proofs {
             self.contracts_trie_storage_proofs.entry(address).or_default().extend(proof);
         }
     }
+
+    /// Bincode payload for the OS-input witness KV (structured proofs, round-trips with
+    /// [`Self::deserialize`]).
+    #[cfg(feature = "os_input")]
+    pub fn serialize(&self) -> SerializationResult<DbValue> {
+        let classes = sorted_encoded_preimage_map(&self.classes_trie_proof)?;
+        let contract_nodes = sorted_encoded_preimage_map(&self.contracts_trie_proof.nodes)?;
+        let mut contract_leaves: Vec<(ContractAddress, (Nonce, HashOutput, ClassHash))> = self
+            .contracts_trie_proof
+            .leaves
+            .iter()
+            .map(|(addr, s)| (*addr, (s.nonce, s.storage_root_hash, s.class_hash)))
+            .collect();
+        contract_leaves.sort_by(|(a, _), (b, _)| a.cmp(b));
+
+        let mut storage: Vec<(ContractAddress, Vec<(HashOutput, Vec<u8>)>)> = Vec::new();
+        for (addr, m) in &self.contracts_trie_storage_proofs {
+            storage.push((*addr, sorted_encoded_preimage_map(m)?));
+        }
+        storage.sort_by(|(a, _), (b, _)| a.cmp(b));
+
+        bincode::serialize(&(classes, contract_nodes, contract_leaves, storage))
+            .map(DbValue)
+            .map_err(bincode_ser_err)
+    }
+
+    #[cfg(feature = "os_input")]
+    pub fn deserialize(value: &DbValue) -> Result<Self, DeserializationError> {
+        let (classes, contract_nodes, contract_leaves, storage): (
+            Vec<(HashOutput, Vec<u8>)>,
+            Vec<(HashOutput, Vec<u8>)>,
+            Vec<(ContractAddress, (Nonce, HashOutput, ClassHash))>,
+            Vec<(ContractAddress, Vec<(HashOutput, Vec<u8>)>)>,
+        ) = bincode::deserialize(&value.0).map_err(|e| {
+            DeserializationError::ValueError(Box::new(std::io::Error::new(
+                std::io::ErrorKind::InvalidData,
+                e.to_string(),
+            )))
+        })?;
+
+        let classes_trie_proof = preimage_map_from_encoded(classes)?;
+        let contracts_trie_proof = ContractsTrieProof {
+            nodes: preimage_map_from_encoded(contract_nodes)?,
+            leaves: contract_leaves.into_iter().try_fold(
+                HashMap::new(),
+                |mut m, (addr, (nonce, storage_root_hash, class_hash))| {
+                    if m.insert(addr, ContractState { nonce, storage_root_hash, class_hash })
+                        .is_some()
+                    {
+                        return Err(DeserializationError::KeyDuplicate(format!(
+                            "duplicate contracts trie leaf {addr:?}"
+                        )));
+                    }
+                    Ok(m)
+                },
+            )?,
+        };
+
+        let mut contracts_trie_storage_proofs = HashMap::new();
+        for (addr, entries) in storage {
+            if contracts_trie_storage_proofs
+                .insert(addr, preimage_map_from_encoded(entries)?)
+                .is_some()
+            {
+                return Err(DeserializationError::KeyDuplicate(format!(
+                    "duplicate storage trie witness key {addr:?}"
+                )));
+            }
+        }
+
+        Ok(Self { classes_trie_proof, contracts_trie_proof, contracts_trie_storage_proofs })
+    }
+}
+
+#[cfg(feature = "os_input")]
+impl serde::Serialize for StarknetForestProofs {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        let encoded = Self::serialize(self).map_err(serde::ser::Error::custom)?;
+        serializer.serialize_bytes(&encoded.0)
+    }
+}
+
+#[cfg(feature = "os_input")]
+impl<'de> serde::Deserialize<'de> for StarknetForestProofs {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        use serde::de::Error;
+        let bytes = <Vec<u8>>::deserialize(deserializer)?;
+        Self::deserialize(&DbValue(bytes)).map_err(Error::custom)
+    }
 }
 
 pub struct RootHashes {
     pub previous_root_hash: HashOutput,
     pub new_root_hash: HashOutput,
 }
+
+#[cfg(feature = "os_input")]
+const WITNESS_PREIMAGE_BINARY: u8 = 0;
+#[cfg(feature = "os_input")]
+const WITNESS_PREIMAGE_EDGE: u8 = 1;
+
+#[cfg(feature = "os_input")]
+fn bincode_ser_err(e: bincode::Error) -> SerializationError {
+    SerializationError::IOSerialize(std::io::Error::other(e))
+}
+
+#[cfg(feature = "os_input")]
+fn encode_preimage(p: &Preimage) -> Result<Vec<u8>, SerializationError> {
+    match p {
+        Preimage::Binary(b) => {
+            let payload =
+                bincode::serialize(&(b.left_data, b.right_data)).map_err(bincode_ser_err)?;
+            let mut out = Vec::with_capacity(1 + payload.len());
+            out.push(WITNESS_PREIMAGE_BINARY);
+            out.extend_from_slice(&payload);
+            Ok(out)
+        }
+        Preimage::Edge(e) => {
+            let path_bytes = e.path_to_bottom.path.0.to_be_bytes();
+            let payload =
+                bincode::serialize(&(e.bottom_data, path_bytes, u8::from(e.path_to_bottom.length)))
+                    .map_err(bincode_ser_err)?;
+            let mut out = Vec::with_capacity(1 + payload.len());
+            out.push(WITNESS_PREIMAGE_EDGE);
+            out.extend_from_slice(&payload);
+            Ok(out)
+        }
+    }
+}
+
+#[cfg(feature = "os_input")]
+fn decode_preimage(encoded: &[u8]) -> Result<Preimage, DeserializationError> {
+    let Some((&tag, payload)) = encoded.split_first() else {
+        return Err(DeserializationError::ValueError(Box::new(std::io::Error::new(
+            std::io::ErrorKind::InvalidData,
+            "empty encoded preimage",
+        ))));
+    };
+    match tag {
+        WITNESS_PREIMAGE_BINARY => {
+            let (left, right): (HashOutput, HashOutput) =
+                bincode::deserialize(payload).map_err(|e| {
+                    DeserializationError::ValueError(Box::new(std::io::Error::new(
+                        std::io::ErrorKind::InvalidData,
+                        e.to_string(),
+                    )))
+                })?;
+            Ok(Preimage::Binary(BinaryData { left_data: left, right_data: right }))
+        }
+        WITNESS_PREIMAGE_EDGE => {
+            let (bottom, path_bytes, length_u8): (HashOutput, [u8; 32], u8) =
+                bincode::deserialize(payload).map_err(|e| {
+                    DeserializationError::ValueError(Box::new(std::io::Error::new(
+                        std::io::ErrorKind::InvalidData,
+                        e.to_string(),
+                    )))
+                })?;
+            let path = EdgePath(U256::from_be_bytes(path_bytes));
+            let length = EdgePathLength::new(length_u8).map_err(|e: EdgePathError| {
+                DeserializationError::ValueError(Box::new(std::io::Error::new(
+                    std::io::ErrorKind::InvalidData,
+                    e.to_string(),
+                )))
+            })?;
+            let path_to_bottom =
+                PathToBottom::new(path, length).map_err(|e: PathToBottomError| {
+                    DeserializationError::ValueError(Box::new(std::io::Error::new(
+                        std::io::ErrorKind::InvalidData,
+                        e.to_string(),
+                    )))
+                })?;
+            Ok(Preimage::Edge(EdgeData { bottom_data: bottom, path_to_bottom }))
+        }
+        other => Err(DeserializationError::ValueError(Box::new(std::io::Error::new(
+            std::io::ErrorKind::InvalidData,
+            format!("unknown preimage tag {other}"),
+        )))),
+    }
+}
+
+#[cfg(feature = "os_input")]
+fn sorted_encoded_preimage_map(
+    m: &PreimageMap,
+) -> Result<Vec<(HashOutput, Vec<u8>)>, SerializationError> {
+    let mut v = Vec::with_capacity(m.len());
+    for (h, p) in m {
+        let encoded = encode_preimage(p)?;
+        v.push((*h, encoded));
+    }
+    v.sort_by(|(a, _), (b, _)| a.0.cmp(&b.0));
+    Ok(v)
+}
+
+#[cfg(feature = "os_input")]
+fn preimage_map_from_encoded(
+    v: Vec<(HashOutput, Vec<u8>)>,
+) -> Result<PreimageMap, DeserializationError> {
+    let mut m = PreimageMap::new();
+    for (h, buf) in v {
+        if m.insert(h, decode_preimage(&buf)?).is_some() {
+            return Err(DeserializationError::KeyDuplicate(format!(
+                "duplicate preimage node hash {h:?}"
+            )));
+        }
+    }
+    Ok(m)
+}