feat: wasm support (#182)

* basic consensus setup

* basic execution setup

* patch for wasm

* basic wasm client

* proxy cors for testing

* migrate to webpack

* use typescript

* track chain head

* rename to helios-ts

* better build instructions

* add getCode

* builds everywhere

* add wasm-pack to dependencies

* compile for both wasm and non-wasm

* fix deps

* fix deps

* remove ds store

* add blocktags

* add getNonce

* use BTreeMap to store payloads

* add getTransaction

* switch to proper ethers provider

* post merge fixes

* compile client to wasm

* fix tests

* fmt

* use milagro for bls

* handle node advance in rust

* faster bls deserialization

* clippy

* add ConfigDB

* remove ts bindings

* fix gitignore

* remove ts workspace member

* remove unused mut

* uncomment old deletions

* bump to 0.2.0

.gitignore

@@ -1,3 +1,3 @@
-/target
+.DS_Store
-
+target
 *.env

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "helios"
-version = "0.1.3"
+version = "0.2.0"
 edition = "2021"
 autobenches = false
 
@@ -21,11 +21,11 @@ common = { path = "./common" }
 consensus = { path = "./consensus" }
 execution = { path = "./execution" }
 
-[dev-dependencies]
+[target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
 tokio = { version = "1", features = ["full"] }
 eyre = "0.6.8"
 home = "0.5.4"
-ethers = "1.0.2"
+ethers = "1.0.0"
 env_logger = "0.9.0"
 log = "0.4.17"
 tracing-test = "0.2.3"
@@ -34,6 +34,9 @@ plotters = "0.3.3"
 tempfile = "3.3.0"
 hex = "0.4.3"
 
+[patch.crates-io]
+ethers = { git = "https://github.com/gakonst/ethers-rs", rev = "c17c0c3c956f12d205a5ede3176599d8a30ca739" }
+
 [profile.release]
 strip = true
 opt-level = "z"

cli/Cargo.toml

@@ -2,7 +2,7 @@ cargo-features = ["different-binary-name"]
 
 [package]
 name = "cli"
-version = "0.1.3"
+version = "0.2.0"
 edition = "2021"
 
 [[bin]]

cli/src/main.rs

@@ -1,5 +1,4 @@
 use std::{
-    fs,
     path::PathBuf,
     process::exit,
     str::FromStr,
@@ -104,10 +103,10 @@ struct Cli {
 
 impl Cli {
     fn as_cli_config(&self) -> CliConfig {
-        let checkpoint = match &self.checkpoint {
+        let checkpoint = self
-            Some(checkpoint) => Some(hex_str_to_bytes(checkpoint).expect("invalid checkpoint")),
+            .checkpoint
-            None => self.get_cached_checkpoint(),
+            .as_ref()
-        };
+            .map(|c| hex_str_to_bytes(c).expect("invalid checkpoint"));
 
         CliConfig {
             checkpoint,
@@ -121,21 +120,6 @@ impl Cli {
         }
     }
 
-    fn get_cached_checkpoint(&self) -> Option<Vec<u8>> {
-        let data_dir = self.get_data_dir();
-        let checkpoint_file = data_dir.join("checkpoint");
-
-        if checkpoint_file.exists() {
-            let checkpoint_res = fs::read(checkpoint_file);
-            match checkpoint_res {
-                Ok(checkpoint) => Some(checkpoint),
-                Err(_) => None,
-            }
-        } else {
-            None
-        }
-    }
-
     fn get_data_dir(&self) -> PathBuf {
         if let Some(dir) = &self.data_dir {
             PathBuf::from_str(dir).expect("cannot find data dir")

client/Cargo.toml

@@ -1,16 +1,14 @@
 [package]
 name = "client"
-version = "0.1.3"
+version = "0.2.0"
 edition = "2021"
 
 [dependencies]
-tokio = { version = "1", features = ["full"] }
 eyre = "0.6.8"
 serde = { version = "1.0.143", features = ["derive"] }
 hex = "0.4.3"
-ssz-rs = { git = "https://github.com/ralexstokes/ssz-rs", rev = "cb08f18ca919cc1b685b861d0fa9e2daabe89737" }
+ssz-rs = { git = "https://github.com/ralexstokes/ssz-rs", rev = "d09f55b4f8554491e3431e01af1c32347a8781cd" }
-ethers = "1.0.2"
+ethers = "1.0.0"
-jsonrpsee = { version = "0.15.1", features = ["full"] }
 futures = "0.3.23"
 log = "0.4.17"
 thiserror = "1.0.37"
@@ -19,3 +17,13 @@ common = { path = "../common" }
 consensus = { path = "../consensus" }
 execution = { path = "../execution" }
 config = { path = "../config" }
+
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+jsonrpsee = { version = "0.15.1", features = ["full"] }
+tokio = { version = "1", features = ["full"] }
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+gloo-timers = "0.2.6"
+wasm-bindgen-futures = "0.4.33"
+tokio = { version = "1", features = ["sync"] }
+

client/src/client.rs

@@ -1,4 +1,3 @@
-use std::path::PathBuf;
 use std::sync::Arc;
 
 use config::networks::Network;
@@ -12,13 +11,25 @@ use config::{CheckpointFallback, Config};
 use consensus::{types::Header, ConsensusClient};
 use execution::types::{CallOpts, ExecutionBlock};
 use log::{error, info, warn};
-use tokio::spawn;
 use tokio::sync::RwLock;
+
+#[cfg(not(target_arch = "wasm32"))]
+use std::path::PathBuf;
+#[cfg(not(target_arch = "wasm32"))]
+use tokio::spawn;
+#[cfg(not(target_arch = "wasm32"))]
 use tokio::time::sleep;
 
-use crate::database::{Database, FileDB};
+#[cfg(target_arch = "wasm32")]
+use gloo_timers::callback::Interval;
+#[cfg(target_arch = "wasm32")]
+use wasm_bindgen_futures::spawn_local;
+
+use crate::database::Database;
 use crate::errors::NodeError;
 use crate::node::Node;
+
+#[cfg(not(target_arch = "wasm32"))]
 use crate::rpc::Rpc;
 
 #[derive(Default)]
@@ -27,7 +38,9 @@ pub struct ClientBuilder {
     consensus_rpc: Option<String>,
     execution_rpc: Option<String>,
     checkpoint: Option<Vec<u8>>,
+    #[cfg(not(target_arch = "wasm32"))]
     rpc_port: Option<u16>,
+    #[cfg(not(target_arch = "wasm32"))]
     data_dir: Option<PathBuf>,
     config: Option<Config>,
     fallback: Option<String>,
@@ -62,11 +75,13 @@ impl ClientBuilder {
         self
     }
 
+    #[cfg(not(target_arch = "wasm32"))]
     pub fn rpc_port(mut self, port: u16) -> Self {
         self.rpc_port = Some(port);
         self
     }
 
+    #[cfg(not(target_arch = "wasm32"))]
     pub fn data_dir(mut self, data_dir: PathBuf) -> Self {
         self.data_dir = Some(data_dir);
         self
@@ -92,7 +107,7 @@ impl ClientBuilder {
         self
     }
 
-    pub fn build(self) -> Result<Client<FileDB>> {
+    pub fn build<DB: Database>(self) -> Result<Client<DB>> {
         let base_config = if let Some(network) = self.network {
             network.to_base_config()
         } else {
@@ -127,6 +142,7 @@ impl ClientBuilder {
             base_config.checkpoint
         };
 
+        #[cfg(not(target_arch = "wasm32"))]
         let rpc_port = if self.rpc_port.is_some() {
             self.rpc_port
         } else if let Some(config) = &self.config {
@@ -135,6 +151,7 @@ impl ClientBuilder {
             None
         };
 
+        #[cfg(not(target_arch = "wasm32"))]
         let data_dir = if self.data_dir.is_some() {
             self.data_dir
         } else if let Some(config) = &self.config {
@@ -167,8 +184,14 @@ impl ClientBuilder {
             consensus_rpc,
             execution_rpc,
             checkpoint,
+            #[cfg(not(target_arch = "wasm32"))]
             rpc_port,
+            #[cfg(target_arch = "wasm32")]
+            rpc_port: None,
+            #[cfg(not(target_arch = "wasm32"))]
             data_dir,
+            #[cfg(target_arch = "wasm32")]
+            data_dir: None,
             chain: base_config.chain,
             forks: base_config.forks,
             max_checkpoint_age: base_config.max_checkpoint_age,
@@ -183,35 +206,38 @@ impl ClientBuilder {
 
 pub struct Client<DB: Database> {
     node: Arc<RwLock<Node>>,
+    #[cfg(not(target_arch = "wasm32"))]
     rpc: Option<Rpc>,
-    db: Option<DB>,
+    db: DB,
     fallback: Option<String>,
     load_external_fallback: bool,
 }
 
-impl Client<FileDB> {
+impl<DB: Database> Client<DB> {
-    fn new(config: Config) -> Result<Self> {
+    fn new(mut config: Config) -> Result<Self> {
+        let db = DB::new(&config)?;
+        let checkpoint = db.load_checkpoint()?;
+        config.checkpoint = checkpoint;
+
         let config = Arc::new(config);
         let node = Node::new(config.clone())?;
         let node = Arc::new(RwLock::new(node));
 
+        #[cfg(not(target_arch = "wasm32"))]
         let rpc = config.rpc_port.map(|port| Rpc::new(node.clone(), port));
 
-        let data_dir = config.data_dir.clone();
-        let db = data_dir.map(FileDB::new);
-
         Ok(Client {
             node,
+            #[cfg(not(target_arch = "wasm32"))]
             rpc,
             db,
             fallback: config.fallback.clone(),
             load_external_fallback: config.load_external_fallback,
         })
     }
-}
 
-impl<DB: Database> Client<DB> {
     pub async fn start(&mut self) -> Result<()> {
+        #[cfg(not(target_arch = "wasm32"))]
         if let Some(rpc) = &mut self.rpc {
             rpc.start().await?;
         }
@@ -241,6 +267,13 @@ impl<DB: Database> Client<DB> {
             }
         }
 
+        self.start_advance_thread();
+
+        Ok(())
+    }
+
+    #[cfg(not(target_arch = "wasm32"))]
+    fn start_advance_thread(&self) {
         let node = self.node.clone();
         spawn(async move {
             loop {
@@ -250,11 +283,25 @@ impl<DB: Database> Client<DB> {
                 }
 
                 let next_update = node.read().await.duration_until_next_update();
+
                 sleep(next_update).await;
             }
         });
+    }
 
-        Ok(())
+    #[cfg(target_arch = "wasm32")]
+    fn start_advance_thread(&self) {
+        let node = self.node.clone();
+        Interval::new(12000, move || {
+            let node = node.clone();
+            spawn_local(async move {
+                let res = node.write().await.advance().await;
+                if let Err(err) = res {
+                    warn!("consensus error: {}", err);
+                }
+            });
+        })
+        .forget();
     }
 
     async fn boot_from_fallback(&self) -> eyre::Result<()> {
@@ -335,8 +382,8 @@ impl<DB: Database> Client<DB> {
         };
 
         info!("saving last checkpoint hash");
-        let res = self.db.as_ref().map(|db| db.save_checkpoint(checkpoint));
+        let res = self.db.save_checkpoint(checkpoint);
-        if res.is_some() && res.unwrap().is_err() {
+        if res.is_err() {
             warn!("checkpoint save failed");
         }
     }

client/src/database.rs

@@ -1,27 +1,40 @@
+#[cfg(not(target_arch = "wasm32"))]
 use std::{
     fs,
     io::{Read, Write},
     path::PathBuf,
 };
 
+use config::Config;
 use eyre::Result;
 
 pub trait Database {
+    fn new(config: &Config) -> Result<Self>
+    where
+        Self: Sized;
     fn save_checkpoint(&self, checkpoint: Vec<u8>) -> Result<()>;
     fn load_checkpoint(&self) -> Result<Vec<u8>>;
 }
 
+#[cfg(not(target_arch = "wasm32"))]
 pub struct FileDB {
     data_dir: PathBuf,
+    default_checkpoint: Vec<u8>,
 }
 
-impl FileDB {
+#[cfg(not(target_arch = "wasm32"))]
-    pub fn new(data_dir: PathBuf) -> Self {
-        FileDB { data_dir }
-    }
-}
-
 impl Database for FileDB {
+    fn new(config: &Config) -> Result<Self> {
+        if let Some(data_dir) = &config.data_dir {
+            return Ok(FileDB {
+                data_dir: data_dir.to_path_buf(),
+                default_checkpoint: config.checkpoint.clone(),
+            });
+        }
+
+        eyre::bail!("data dir not in config")
+    }
+
     fn save_checkpoint(&self, checkpoint: Vec<u8>) -> Result<()> {
         fs::create_dir_all(&self.data_dir)?;
 
@@ -44,6 +57,30 @@ impl Database for FileDB {
         let mut buf = Vec::new();
         f.read_to_end(&mut buf)?;
 
+        if buf.len() == 32 {
             Ok(buf)
+        } else {
+            Ok(self.default_checkpoint.clone())
+        }
+    }
+}
+
+pub struct ConfigDB {
+    checkpoint: Vec<u8>,
+}
+
+impl Database for ConfigDB {
+    fn new(config: &Config) -> Result<Self> {
+        Ok(Self {
+            checkpoint: config.checkpoint.clone(),
+        })
+    }
+
+    fn load_checkpoint(&self) -> Result<Vec<u8>> {
+        Ok(self.checkpoint.clone())
+    }
+
+    fn save_checkpoint(&self, _checkpoint: Vec<u8>) -> Result<()> {
+        Ok(())
     }
 }

client/src/errors.rs

@@ -37,6 +37,7 @@ pub enum NodeError {
     BlockNotFoundError(#[from] BlockNotFoundError),
 }
 
+#[cfg(not(target_arch = "wasm32"))]
 impl NodeError {
     pub fn to_json_rpsee_error(self) -> jsonrpsee::core::Error {
         match self {

client/src/lib.rs

@@ -3,6 +3,8 @@ pub use crate::client::*;
 
 pub mod database;
 pub mod errors;
+
+#[cfg(not(target_arch = "wasm32"))]
 pub mod rpc;
 
-mod node;
+pub mod node;

common/Cargo.toml

@@ -1,12 +1,12 @@
 [package]
 name = "common"
-version = "0.1.3"
+version = "0.2.0"
 edition = "2021"
 
 [dependencies]
 eyre = "0.6.8"
 serde = { version = "1.0.143", features = ["derive"] }
 hex = "0.4.3"
-ssz-rs = { git = "https://github.com/ralexstokes/ssz-rs", rev = "cb08f18ca919cc1b685b861d0fa9e2daabe89737" }
+ssz-rs = { git = "https://github.com/ralexstokes/ssz-rs", rev = "d09f55b4f8554491e3431e01af1c32347a8781cd" }
-ethers = "1.0.2"
+ethers = "1.0.0"
 thiserror = "1.0.37"

config/Cargo.toml

@@ -1,24 +1,24 @@
 
 [package]
 name = "config"
-version = "0.1.3"
+version = "0.2.0"
 edition = "2021"
 
 [dependencies]
-tokio = { version = "1", features = ["full"] }
 eyre = "0.6.8"
 serde = { version = "1.0.143", features = ["derive"] }
 hex = "0.4.3"
-ssz-rs = { git = "https://github.com/ralexstokes/ssz-rs", rev = "cb08f18ca919cc1b685b861d0fa9e2daabe89737" }
+ssz-rs = { git = "https://github.com/ralexstokes/ssz-rs", rev = "d09f55b4f8554491e3431e01af1c32347a8781cd" }
-ethers = "1.0.2"
+ethers = "1.0.0"
 figment = { version = "0.10.7", features = ["toml", "env"] }
 thiserror = "1.0.37"
 log = "0.4.17"
-
-common = { path = "../common" }
 reqwest = "0.11.13"
 serde_yaml = "0.9.14"
 strum = "0.24.1"
 futures = "0.3.25"
 
+common = { path = "../common" }
 
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+tokio = { version = "1", features = ["full"] }

config/src/checkpoints.rs

@@ -136,9 +136,8 @@ impl CheckpointFallback {
         // Iterate over all mainnet checkpoint sync services and get the latest checkpoint slot for each.
         let tasks: Vec<_> = services
             .iter()
-            .map(|service| {
+            .map(|service| async move {
                 let service = service.clone();
-                tokio::spawn(async move {
                 match Self::query_service(&service.endpoint).await {
                     Some(raw) => {
                         if raw.data.slots.is_empty() {
@@ -149,13 +148,13 @@ impl CheckpointFallback {
                     None => Err(eyre::eyre!("failed to query service")),
                 }
             })
-            })
             .collect();
+
         let slots = futures::future::join_all(tasks)
             .await
             .iter()
             .filter_map(|slot| match &slot {
-                Ok(Ok(s)) => Some(s.clone()),
+                Ok(s) => Some(s.clone()),
                 _ => None,
             })
             .collect::<Vec<_>>();

config/src/networks.rs

@@ -36,7 +36,7 @@ impl Network {
 pub fn mainnet() -> BaseConfig {
     BaseConfig {
         checkpoint: hex_str_to_bytes(
-            "0x428ce0b5f5bbed1fc2b3feb5d4152ae0fe98a80b1bfa8de36681868e81e9222a",
+            "0x766647f3c4e1fc91c0db9a9374032ae038778411fbff222974e11f2e3ce7dadf",
         )
         .unwrap(),
         rpc_port: 8545,

consensus/Cargo.toml

@@ -1,27 +1,31 @@
 [package]
 name = "consensus"
-version = "0.1.3"
+version = "0.2.0"
 edition = "2021"
 
 [dependencies]
-tokio = { version = "1", features = ["full"] }
 eyre = "0.6.8"
 serde = { version = "1.0.143", features = ["derive"] }
 serde_json = "1.0.85"
 hex = "0.4.3"
-ssz-rs = { git = "https://github.com/ralexstokes/ssz-rs", rev = "cb08f18ca919cc1b685b861d0fa9e2daabe89737" }
+ssz-rs = { git = "https://github.com/ralexstokes/ssz-rs", rev = "d09f55b4f8554491e3431e01af1c32347a8781cd" }
-blst = "0.3.10"
+milagro_bls = { git = "https://github.com/Snowfork/milagro_bls" }
-ethers = "1.0.2"
+ethers = "1.0.0"
 bytes = "1.2.1"
 toml = "0.5.9"
 async-trait = "0.1.57"
 log = "0.4.17"
 chrono = "0.4.22"
 thiserror = "1.0.37"
-openssl = { version = "0.10", features = ["vendored"] }
+reqwest = { version = "0.11.13", features = ["json"] }
-reqwest = { version = "0.11.12", features = ["json"] }
-reqwest-middleware = "0.1.6"
-reqwest-retry = "0.1.5"
 
 common = { path = "../common" }
 config = { path = "../config" }
+
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+openssl = { version = "0.10", features = ["vendored"] }
+tokio = { version = "1", features = ["full"] }
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+wasm-timer = "0.2.5"
+

consensus/src/consensus.rs

@@ -1,13 +1,12 @@
 use std::cmp;
 use std::sync::Arc;
-use std::time::UNIX_EPOCH;
 
-use blst::min_pk::PublicKey;
 use chrono::Duration;
 use eyre::eyre;
 use eyre::Result;
 use log::warn;
 use log::{debug, info};
+use milagro_bls::PublicKey;
 use ssz_rs::prelude::*;
 
 use common::types::*;
@@ -21,9 +20,20 @@ use super::rpc::ConsensusRpc;
 use super::types::*;
 use super::utils::*;
 
+#[cfg(not(target_arch = "wasm32"))]
+use std::time::SystemTime;
+#[cfg(not(target_arch = "wasm32"))]
+use std::time::UNIX_EPOCH;
+
+#[cfg(target_arch = "wasm32")]
+use wasm_timer::SystemTime;
+#[cfg(target_arch = "wasm32")]
+use wasm_timer::UNIX_EPOCH;
+
 // https://github.com/ethereum/consensus-specs/blob/dev/specs/altair/light-client/sync-protocol.md
 // does not implement force updates
 
+#[derive(Debug)]
 pub struct ConsensusClient<R: ConsensusRpc> {
     rpc: R,
     store: LightClientStore,
@@ -480,18 +490,13 @@ impl<R: ConsensusRpc> ConsensusClient<R> {
 
     fn age(&self, slot: u64) -> Duration {
         let expected_time = self.slot_timestamp(slot);
-        let now = std::time::SystemTime::now()
+        let now = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
-            .duration_since(UNIX_EPOCH)
-            .unwrap();
         let delay = now - std::time::Duration::from_secs(expected_time);
         chrono::Duration::from_std(delay).unwrap()
     }
 
     pub fn expected_current_slot(&self) -> u64 {
-        let now = std::time::SystemTime::now()
+        let now = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
-            .duration_since(UNIX_EPOCH)
-            .unwrap();
-
         let genesis_time = self.config.chain.genesis_time;
         let since_genesis = now - std::time::Duration::from_secs(genesis_time);
 
@@ -509,7 +514,7 @@ impl<R: ConsensusRpc> ConsensusClient<R> {
         let next_slot = current_slot + 1;
         let next_slot_timestamp = self.slot_timestamp(next_slot);
 
-        let now = std::time::SystemTime::now()
+        let now = SystemTime::now()
             .duration_since(UNIX_EPOCH)
             .unwrap()
             .as_secs();
@@ -540,7 +545,7 @@ fn get_participating_keys(
     bitfield.iter().enumerate().for_each(|(i, bit)| {
         if bit == true {
             let pk = &committee.pubkeys[i];
-            let pk = PublicKey::from_bytes(pk).unwrap();
+            let pk = PublicKey::from_bytes_unchecked(pk).unwrap();
             pks.push(pk);
         }
     });

consensus/src/rpc/mock_rpc.rs

@@ -8,7 +8,8 @@ pub struct MockRpc {
     testdata: PathBuf,
 }
 
-#[async_trait]
+#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
+#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
 impl ConsensusRpc for MockRpc {
     fn new(path: &str) -> Self {
         MockRpc {

consensus/src/rpc/mod.rs

@@ -7,7 +7,8 @@ use eyre::Result;
 use crate::types::{BeaconBlock, Bootstrap, FinalityUpdate, OptimisticUpdate, Update};
 
 // implements https://github.com/ethereum/beacon-APIs/tree/master/apis/beacon/light_client
-#[async_trait]
+#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
+#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
 pub trait ConsensusRpc {
     fn new(path: &str) -> Self;
     async fn get_bootstrap(&self, block_root: &'_ [u8]) -> Result<Bootstrap>;

consensus/src/rpc/nimbus_rpc.rs

@@ -1,7 +1,5 @@
 use async_trait::async_trait;
 use eyre::Result;
-use reqwest_middleware::{ClientBuilder, ClientWithMiddleware};
-use reqwest_retry::{policies::ExponentialBackoff, RetryTransientMiddleware};
 use std::cmp;
 
 use super::ConsensusRpc;
@@ -9,25 +7,17 @@ use crate::constants::MAX_REQUEST_LIGHT_CLIENT_UPDATES;
 use crate::types::*;
 use common::errors::RpcError;
 
+#[derive(Debug)]
 pub struct NimbusRpc {
     rpc: String,
-    client: ClientWithMiddleware,
 }
 
-#[async_trait]
+#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
+#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
 impl ConsensusRpc for NimbusRpc {
     fn new(rpc: &str) -> Self {
-        let retry_policy = ExponentialBackoff::builder()
-            .backoff_exponent(1)
-            .build_with_max_retries(3);
-
-        let client = ClientBuilder::new(reqwest::Client::new())
-            .with(RetryTransientMiddleware::new_with_policy(retry_policy))
-            .build();
-
         NimbusRpc {
             rpc: rpc.to_string(),
-            client,
         }
     }
 
@@ -38,8 +28,8 @@ impl ConsensusRpc for NimbusRpc {
             self.rpc, root_hex
         );
 
-        let res = self
+        let client = reqwest::Client::new();
-            .client
+        let res = client
             .get(req)
             .send()
             .await
@@ -58,8 +48,8 @@ impl ConsensusRpc for NimbusRpc {
             self.rpc, period, count
         );
 
-        let res = self
+        let client = reqwest::Client::new();
-            .client
+        let res = client
             .get(req)
             .send()
             .await
@@ -73,10 +63,7 @@ impl ConsensusRpc for NimbusRpc {
 
     async fn get_finality_update(&self) -> Result<FinalityUpdate> {
         let req = format!("{}/eth/v1/beacon/light_client/finality_update", self.rpc);
-        let res = self
+        let res = reqwest::get(req)
-            .client
-            .get(req)
-            .send()
             .await
             .map_err(|e| RpcError::new("finality_update", e))?
             .json::<FinalityUpdateResponse>()
@@ -88,10 +75,7 @@ impl ConsensusRpc for NimbusRpc {
 
     async fn get_optimistic_update(&self) -> Result<OptimisticUpdate> {
         let req = format!("{}/eth/v1/beacon/light_client/optimistic_update", self.rpc);
-        let res = self
+        let res = reqwest::get(req)
-            .client
-            .get(req)
-            .send()
             .await
             .map_err(|e| RpcError::new("optimistic_update", e))?
             .json::<OptimisticUpdateResponse>()
@@ -103,10 +87,7 @@ impl ConsensusRpc for NimbusRpc {
 
     async fn get_block(&self, slot: u64) -> Result<BeaconBlock> {
         let req = format!("{}/eth/v2/beacon/blocks/{}", self.rpc, slot);
-        let res = self
+        let res = reqwest::get(req)
-            .client
-            .get(req)
-            .send()
             .await
             .map_err(|e| RpcError::new("blocks", e))?
             .json::<BeaconBlockResponse>()
@@ -118,10 +99,7 @@ impl ConsensusRpc for NimbusRpc {
 
     async fn chain_id(&self) -> Result<u64> {
         let req = format!("{}/eth/v1/config/spec", self.rpc);
-        let res = self
+        let res = reqwest::get(req)
-            .client
-            .get(req)
-            .send()
             .await
             .map_err(|e| RpcError::new("spec", e))?
             .json::<SpecResponse>()

consensus/src/utils.rs

@@ -1,9 +1,6 @@
-use blst::{
-    min_pk::{PublicKey, Signature},
-    BLST_ERROR,
-};
 use common::{types::Bytes32, utils::bytes32_to_node};
 use eyre::Result;
+use milagro_bls::{AggregateSignature, PublicKey};
 use ssz_rs::prelude::*;
 
 use crate::types::{Header, SignatureBytes};
@@ -14,10 +11,9 @@ pub fn calc_sync_period(slot: u64) -> u64 {
 }
 
 pub fn is_aggregate_valid(sig_bytes: &SignatureBytes, msg: &[u8], pks: &[&PublicKey]) -> bool {
-    let dst: &[u8] = b"BLS_SIG_BLS12381G2_XMD:SHA-256_SSWU_RO_POP_";
+    let sig_res = AggregateSignature::from_bytes(sig_bytes);
-    let sig_res = Signature::from_bytes(sig_bytes);
     match sig_res {
-        Ok(sig) => sig.fast_aggregate_verify(true, msg, dst, pks) == BLST_ERROR::BLST_SUCCESS,
+        Ok(sig) => sig.fast_aggregate_verify(msg, pks),
         Err(_) => false,
     }
 }

examples/basic.rs

@@ -3,7 +3,7 @@ use std::str::FromStr;
 use env_logger::Env;
 use ethers::{types::Address, utils};
 use eyre::Result;
-use helios::{client::ClientBuilder, config::networks::Network, types::BlockTag};
+use helios::{config::networks::Network, prelude::*};
 
 #[tokio::main]
 async fn main() -> Result<()> {
@@ -15,12 +15,13 @@ async fn main() -> Result<()> {
     let consensus_rpc = "https://www.lightclientdata.org";
     log::info!("Using consensus RPC URL: {}", consensus_rpc);
 
-    let mut client = ClientBuilder::new()
+    let mut client: Client<FileDB> = ClientBuilder::new()
         .network(Network::MAINNET)
         .consensus_rpc(consensus_rpc)
         .execution_rpc(untrusted_rpc_url)
         .load_external_fallback()
         .build()?;
+
     log::info!(
         "Built client on network \"{}\" with external checkpoint fallbacks",
         Network::MAINNET

examples/client.rs

@@ -35,7 +35,7 @@ async fn main() -> Result<()> {
     builder = builder.load_external_fallback();
 
     // Build the client
-    let _client = builder.build().unwrap();
+    let _client: Client<FileDB> = builder.build().unwrap();
     println!("Constructed client!");
 
     Ok(())

execution/Cargo.toml

@@ -1,18 +1,17 @@
 [package]
 name = "execution"
-version = "0.1.3"
+version = "0.2.0"
 edition = "2021"
 
 [dependencies]
 reqwest = { version = "0.11", features = ["json"] }
-tokio = { version = "1", features = ["full"] }
 eyre = "0.6.8"
 serde = { version = "1.0.143", features = ["derive"] }
 serde_json = "1.0.85"
 hex = "0.4.3"
-ssz-rs = { git = "https://github.com/ralexstokes/ssz-rs", rev = "cb08f18ca919cc1b685b861d0fa9e2daabe89737" }
+ssz-rs = { git = "https://github.com/ralexstokes/ssz-rs", rev = "d09f55b4f8554491e3431e01af1c32347a8781cd" }
-ethers = "1.0.2"
+revm = { version = "2.3", default-features = false, features = ["std", "k256", "with-serde"] }
-revm = "2.1.0"
+ethers = "1.0.0"
 bytes = "1.2.1"
 futures = "0.3.23"
 toml = "0.5.9"
@@ -20,7 +19,10 @@ triehash-ethereum = { git = "https://github.com/openethereum/parity-ethereum", r
 async-trait = "0.1.57"
 log = "0.4.17"
 thiserror = "1.0.37"
-openssl = { version = "0.10", features = ["vendored"] }
 
 common = { path = "../common" }
 consensus = { path = "../consensus" }
+
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+openssl = { version = "0.10", features = ["vendored"] }
+tokio = { version = "1", features = ["full"] }

execution/src/evm.rs

@@ -9,14 +9,13 @@ use bytes::Bytes;
 use common::{errors::BlockNotFoundError, types::BlockTag};
 use ethers::{
     abi::ethereum_types::BigEndianHash,
-    prelude::{Address, H160, H256, U256},
     types::transaction::eip2930::AccessListItem,
+    types::{Address, H160, H256, U256},
 };
 use eyre::{Report, Result};
-use futures::future::join_all;
+use futures::{executor::block_on, future::join_all};
 use log::trace;
 use revm::{AccountInfo, Bytecode, Database, Env, TransactOut, TransactTo, EVM};
-use tokio::runtime::Runtime;
 
 use consensus::types::ExecutionPayload;
 
@@ -225,8 +224,9 @@ impl<'a, R: ExecutionRpc> ProofDB<'a, R> {
 
         let handle = thread::spawn(move || {
             let account_fut = execution.get_account(&address, Some(&slots), &payload);
-            let runtime = Runtime::new()?;
+            // let runtime = Runtime::new()?;
-            runtime.block_on(account_fut)
+            // runtime.block_on(account_fut)
+            block_on(account_fut)
         });
 
         handle.join().unwrap()

execution/src/rpc/http_rpc.rs

@@ -27,13 +27,16 @@ impl Clone for HttpRpc {
     }
 }
 
-#[async_trait]
+#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
+#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
 impl ExecutionRpc for HttpRpc {
     fn new(rpc: &str) -> Result<Self> {
         let http = Http::from_str(rpc)?;
         let mut client = RetryClient::new(http, Box::new(HttpRateLimitRetryPolicy), 100, 50);
         client.set_compute_units(300);
+
         let provider = Provider::new(client);
+
         Ok(HttpRpc {
             url: rpc.to_string(),
             provider,

execution/src/rpc/mock_rpc.rs

@@ -17,7 +17,8 @@ pub struct MockRpc {
     path: PathBuf,
 }
 
-#[async_trait]
+#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
+#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
 impl ExecutionRpc for MockRpc {
     fn new(rpc: &str) -> Result<Self> {
         let path = PathBuf::from(rpc);

execution/src/rpc/mod.rs

@@ -10,7 +10,8 @@ use crate::types::CallOpts;
 pub mod http_rpc;
 pub mod mock_rpc;
 
-#[async_trait]
+#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
+#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
 pub trait ExecutionRpc: Send + Clone + Sync + 'static {
     fn new(rpc: &str) -> Result<Self>
     where