Publish State Diff to Eth

Cargo.toml

@@ -15,7 +15,12 @@ authors = ["Apoorv Sadana <@apoorvsadana>"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [workspace.dependencies]
+
+
+num = { version = "0.4.1" }
+ethereum-da-client = { path = "crates/da_clients/ethereum" }
 async-trait = { version = "0.1.77" }
+da-client-interface = { path = "crates/da_clients/da-client-interface" }
 axum = { version = "0.7.4" }
 axum-macros = { version = "0.4.1" }
 color-eyre = { version = "0.6.2" }
@@ -33,7 +38,8 @@ tracing = { version = "0.1.40" }
 tracing-subscriber = { version = "0.3.18" }
 url = { version = "2.5.0" }
 uuid = { version = "1.7.0" }
+num-bigint = { version = "0.4.4" }
 httpmock = { version = "0.7.0" }
-da-client-interface = { path = "crates/da_clients/da-client-interface" }
-ethereum-da-client = { path = "crates/da_clients/ethereum" }
 utils = { path = "crates/utils" }
+num-traits = "0.2"
+lazy_static = "1.4.0"

crates/da_clients/da-client-interface/src/lib.rs

@@ -19,9 +19,13 @@ pub enum DaVerificationStatus {
 pub trait DaClient: Send + Sync {
     /// Should publish the state diff to the DA layer and return an external id
     /// which can be used to track the status of the DA transaction.
-    async fn publish_state_diff(&self, state_diff: Vec<FieldElement>) -> Result<String>;
+    async fn publish_state_diff(&self, state_diff: Vec<Vec<u8>>) -> Result<String>;
     /// Should verify the inclusion of the state diff in the DA layer and return the status
     async fn verify_inclusion(&self, external_id: &str) -> Result<DaVerificationStatus>;
+    /// Should return the max blobs per txn
+    async fn max_blob_per_txn(&self) -> u64;
+    /// Should return the max bytes per blob
+    async fn max_bytes_per_blob(&self) -> u64;
 }
 
 /// Trait for every new DaConfig to implement

crates/da_clients/ethereum/.env_example

@@ -0,0 +1,2 @@
+PK="private_key_here"
+ETHEREUM_RPC_URL="https://ethereum-holesky-rpc.publicnode.com"

crates/da_clients/ethereum/Cargo.toml

@@ -4,15 +4,27 @@ version.workspace = true
 edition.workspace = true
 
 [dependencies]
-alloy = { git = "https://github.com/alloy-rs/alloy", rev = "86027c9bb984f3a12a30ffd2a3c5f2f06595f1d6", features = [
+alloy = { git = "https://github.com/alloy-rs/alloy", rev = "68952c0", features = [
+  "consensus",
   "providers",
   "rpc-client",
   "transport-http",
+  "network",
+  "eips",
+  "signers",
+  "signer-wallet",
 ] }
 async-trait = { workspace = true }
 color-eyre = { workspace = true }
 da-client-interface = { workspace = true }
-reqwest = { version = "0.11.24" }
+reqwest = { version = "0.12.3" }
+c-kzg = "1.0.0"
+dotenv = "0.15"
 starknet = { workspace = true }
 url = { workspace = true }
 utils = { workspace = true }
+rstest = { workspace = true }
+tokio = { workspace = true }
+
+[dev-dependencies]
+tokio-test = "*"

crates/da_clients/ethereum/src/config.rs

@@ -5,13 +5,15 @@ use utils::env_utils::get_env_var_or_panic;
 pub struct EthereumDaConfig {
     pub rpc_url: String,
     pub memory_pages_contract: String,
+    pub private_key: String,
 }
 
 impl DaConfig for EthereumDaConfig {
     fn new_from_env() -> Self {
         Self {
             rpc_url: get_env_var_or_panic("ETHEREUM_RPC_URL"),
             memory_pages_contract: get_env_var_or_panic("MEMORY_PAGES_CONTRACT_ADDRESS"),
+            private_key: get_env_var_or_panic("PRIVATE_KEY"),
         }
     }
 }

crates/da_clients/ethereum/src/lib.rs

@@ -1,38 +1,203 @@
 #![allow(missing_docs)]
 #![allow(clippy::missing_docs_in_private_items)]
+use alloy::consensus::{
+    BlobTransactionSidecar, SignableTransaction, TxEip4844, TxEip4844Variant, TxEip4844WithSidecar, TxEnvelope,
+};
+use alloy::eips::{eip2718::Encodable2718, eip2930::AccessList, eip4844::BYTES_PER_BLOB};
+use alloy::network::{Ethereum, TxSigner};
+use alloy::primitives::{bytes, FixedBytes, U256};
+use alloy::providers::{Provider, ProviderBuilder, RootProvider};
 use alloy::rpc::client::RpcClient;
+use alloy::signers::wallet::LocalWallet;
 use alloy::transports::http::Http;
 use async_trait::async_trait;
+
 use color_eyre::Result;
+// use reqwest::async_impl::client::Client;
 use reqwest::Client;
 use starknet::core::types::FieldElement;
+use starknet::core::types::FromByteArrayError;
 use std::str::FromStr;
 use url::Url;
 
+use c_kzg::{Blob, KzgCommitment, KzgProof, KzgSettings};
 use config::EthereumDaConfig;
 use da_client_interface::{DaClient, DaVerificationStatus};
-
+use dotenv::dotenv;
+use std::{env, path::Path};
 pub mod config;
 pub struct EthereumDaClient {
     #[allow(dead_code)]
-    provider: RpcClient<Http<Client>>,
+    provider: RootProvider<Ethereum, Http<Client>>,
+    wallet: LocalWallet,
+    trusted_setup: KzgSettings,
 }
 
 #[async_trait]
 impl DaClient for EthereumDaClient {
-    async fn publish_state_diff(&self, _state_diff: Vec<FieldElement>) -> Result<String> {
-        unimplemented!()
+    async fn publish_state_diff(&self, state_diff: Vec<Vec<u8>>) -> Result<String> {
+        dotenv().ok();
+        let provider = &self.provider;
+        let trusted_setup = &self.trusted_setup;
+        let wallet = &self.wallet;
+        let addr = wallet.address();
+
+        let (sidecar_blobs, sidecar_commitments, sidecar_proofs) = prepare_sidecar(&state_diff, &trusted_setup).await?;
+        let sidecar = BlobTransactionSidecar::new(sidecar_blobs, sidecar_commitments, sidecar_proofs);
+
+        // chain id should be an env variable or should be in config?
+        let tx = TxEip4844 {
+            chain_id: 17000, // Holesky 17000 sepolia 11155111
+            nonce: 1,
+            gas_limit: 30_000_000,
+            max_fee_per_gas: 10000000100, //estimation.max_fee_per_gas.to_string().parse()?,
+            max_priority_fee_per_gas: 200000010,
+            to: addr,
+            value: U256::from(0),
+            access_list: AccessList(vec![]),
+            blob_versioned_hashes: sidecar.versioned_hashes().collect(),
+            max_fee_per_blob_gas: 7300000_535,
+            input: bytes!(),
+        };
+        let tx_sidecar = TxEip4844WithSidecar { tx: tx.clone(), sidecar: sidecar.clone() };
+        let mut variant = TxEip4844Variant::from(tx_sidecar);
+
+        // Sign and submit
+        let signature = wallet.sign_transaction(&mut variant).await?;
+        let tx_signed = variant.into_signed(signature);
+        let tx_envelope: TxEnvelope = tx_signed.into();
+        let encoded = tx_envelope.encoded_2718();
+
+        let pending_tx = provider.send_raw_transaction(&encoded).await?;
+
+        Ok(pending_tx.tx_hash().to_string())
     }
 
     async fn verify_inclusion(&self, _external_id: &str) -> Result<DaVerificationStatus> {
         todo!()
     }
+
+    async fn max_blob_per_txn(&self) -> u64 {
+        6
+    }
+
+    async fn max_bytes_per_blob(&self) -> u64 {
+        131072
+    }
 }
 
 impl From<EthereumDaConfig> for EthereumDaClient {
     fn from(config: EthereumDaConfig) -> Self {
-        let provider = RpcClient::builder()
-            .reqwest_http(Url::from_str(config.rpc_url.as_str()).expect("Failed to parse ETHEREUM_RPC_URL"));
-        EthereumDaClient { provider }
+        let client =
+            RpcClient::new_http(Url::from_str(config.rpc_url.as_str()).expect("Failed to parse ETHEREUM_RPC_URL"));
+        let provider = ProviderBuilder::<_, Ethereum>::new().on_client(client);
+        let wallet: LocalWallet = env::var("PK").expect("PK must be set").parse().expect("issue while parsing");
+        // let wallet: LocalWallet = config.private_key.as_str().parse();
+        let trusted_setup = KzgSettings::load_trusted_setup_file(Path::new("./trusted_setup.txt"))
+            .expect("issue while loading the trusted setup");
+        EthereumDaClient { provider, wallet, trusted_setup }
+    }
+}
+
+async fn prepare_sidecar(
+    state_diff: &[Vec<u8>],
+    trusted_setup: &KzgSettings,
+) -> Result<(Vec<FixedBytes<131072>>, Vec<FixedBytes<48>>, Vec<FixedBytes<48>>)> {
+    let mut sidecar_blobs = vec![];
+    let mut sidecar_commitments = vec![];
+    let mut sidecar_proofs = vec![];
+
+    for blob_data in state_diff {
+        let mut fixed_size_blob: [u8; BYTES_PER_BLOB as usize] = [0; BYTES_PER_BLOB as usize];
+        fixed_size_blob.copy_from_slice(blob_data.as_slice());
+
+        let blob = Blob::new(fixed_size_blob);
+
+        let commitment = KzgCommitment::blob_to_kzg_commitment(&blob, trusted_setup)?;
+        let proof = KzgProof::compute_blob_kzg_proof(&blob, &commitment.to_bytes(), trusted_setup)?;
+
+        sidecar_blobs.push(FixedBytes::new(fixed_size_blob));
+        sidecar_commitments.push(FixedBytes::new(commitment.to_bytes().into_inner()));
+        sidecar_proofs.push(FixedBytes::new(proof.to_bytes().into_inner()));
+    }
+
+    Ok((sidecar_blobs, sidecar_commitments, sidecar_proofs))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use rstest::rstest;
+    use std::fs::File;
+    use std::io::{self, BufRead};
+    use std::io::{BufReader, Read};
+    use tokio_test;
+
+    #[tokio::test]
+    async fn test_kzg() {
+        let trusted_setup = KzgSettings::load_trusted_setup_file(Path::new("./trusted_setup.txt"))
+            .expect("Error loading trusted setup file");
+
+        // hex of the blob data from the block 630872 of L2
+        // https://voyager.online/block/0x3333f2f6b32776ac031e7ed373858c656d6d1040e47b73c94e762e6ed4cedf3 (L2)
+        // https://etherscan.io/tx/0x6b9fc547764a5d6e4451b5236b92e74c70800250f00fc1974fc0a75a459dc12e (L1)
+        let file_path = "./test_utils/hex_block_630872.txt";
+
+        // open the file and store the data as a single string
+        let file = File::open(file_path).expect("Unable to load the file for hex");
+        let reader = io::BufReader::new(file);
+        let mut data = String::new();
+        for line in reader.lines() {
+            if let Ok(line) = line {
+                data.push_str(&line);
+            }
+        }
+
+        // create vec<u8> from the hex string
+        let data_v8 = hex_string_to_u8_vec(&data).expect("error creating hex string from data");
+
+        // creation of sidecar
+        let (sidecar_blobs, sidecar_commitments, sidecar_proofs) =
+            prepare_sidecar(&[data_v8], &trusted_setup).await.expect("Error creating the sidecar blobs");
+
+        // blob commitment from L1
+        let commitment_vector = hex_string_to_u8_vec(
+            "adece1d251a1671e134d57204ef111308818dacf97d2372b28b53f947682de715fd0a75f57496124ec97609a52e8ca52",
+        )
+        .expect("Error creating the vector of u8 from commitment");
+        let commitment_fixedbytes: FixedBytes<48> = FixedBytes::from_slice(&commitment_vector);
+
+        // blob proof from L1
+        let proof_vector = hex_string_to_u8_vec(
+            "999371598a3807abe20956a5754f9894f2d8fe2a0f8fd49bb13f294282121be1118627f2f9fe4e2ea0b9760addd41a0c",
+        )
+        .expect("Error creating the vector of u8 from proof");
+        let proog_fixedbytes: FixedBytes<48> = FixedBytes::from_slice(&proof_vector);
+
+        // blob commitment and proof should be equal to the blob created by prepare_sidecar
+        assert_eq!(sidecar_commitments[0], commitment_fixedbytes);
+        assert_eq!(sidecar_proofs[0], proog_fixedbytes);
+    }
+
+    fn hex_string_to_u8_vec(hex_str: &str) -> Result<Vec<u8>, String> {
+        // Remove any spaces or non-hex characters from the input string
+        let cleaned_str: String = hex_str.chars().filter(|c| c.is_ascii_hexdigit()).collect();
+
+        // Convert the cleaned hex string to a Vec<u8>
+        let mut result = Vec::new();
+        for chunk in cleaned_str.as_bytes().chunks(2) {
+            if let Ok(byte_val) = u8::from_str_radix(std::str::from_utf8(chunk).unwrap(), 16) {
+                result.push(byte_val);
+            } else {
+                return Err(format!("Error parsing hex string: {}", cleaned_str));
+            }
+        }
+        println!("length of vec<u8>: {}", result.len());
+        Ok(result)
+    }
+
+    fn vec_u8_to_hex_string(data: &[u8]) -> String {
+        let hex_chars: Vec<String> = data.iter().map(|byte| format!("{:02X}", byte)).collect();
+        hex_chars.join("")
     }
 }