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Merged
ferranbt merged 2 commits into from
Jan 11, 2026
Merged

Add babel api #58

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f262d3d
Add babel-api + RPC server/client to return status
ferranbt Jan 11, 2026
5a56fee
Add unit test
ferranbt Jan 11, 2026
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41 changes: 41 additions & 0 deletions Cargo.lock
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4 changes: 3 additions & 1 deletion Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@ members = [
"crates/catalog",
"crates/template",
"crates/babel",
"crates/babel-api",
"crates/fetcher",
"crates/fetcher-api",
"crates/cosmos-keys"
Expand All @@ -18,6 +19,7 @@ runtime-docker-compose = { path = "crates/runtime-docker-compose" }
runtime-trait = { path = "crates/runtime-trait" }
catalog = { path = "crates/catalog" }
template = { path = "crates/template" }
babel-api = { path = "crates/babel-api" }
fetcher-api = { path = "crates/fetcher-api" }
cosmos-keys = { path = "crates/cosmos-keys" }

Expand All @@ -34,6 +36,6 @@ tinytemplate = "1.2"
askama = "0.14.0"
clap = { version = "4.5", features = ["derive"] }
reqwest = { version = "0.12", default-features = false }
jsonrpsee = { version = "0.24", features = ["server", "ws-client", "macros"] }
jsonrpsee = { version = "0.24", features = ["server", "ws-client", "http-client", "macros"] }
tracing = "0.1"
tracing-subscriber = "0.3"
12 changes: 12 additions & 0 deletions crates/babel-api/Cargo.toml
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@@ -0,0 +1,12 @@
[package]
name = "babel-api"
version = "0.1.0"
edition = "2021"

[dependencies]
jsonrpsee = { workspace = true }
tokio = { workspace = true }
serde = { workspace = true }
serde_json = { workspace = true }
eyre = { workspace = true }
tracing = "0.1"
21 changes: 21 additions & 0 deletions crates/babel-api/src/lib.rs
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@@ -0,0 +1,21 @@
use jsonrpsee::proc_macros::rpc;
use serde::{Deserialize, Serialize};

/// Status response
#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct Status {
pub peers: u64,
pub current_block_number: u64,
pub is_syncing: bool,
pub latest_block_number: Option<u64>,
pub is_ready: bool,
pub is_healthy: bool,
}

/// JSON-RPC API for Babel status
#[rpc(server, client)]
pub trait BabelApi {
/// Get comprehensive status
#[method(name = "status")]
async fn status(&self) -> Result<Status, jsonrpsee::types::ErrorObjectOwned>;
}
2 changes: 2 additions & 0 deletions crates/babel/Cargo.toml
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Expand Up @@ -13,8 +13,10 @@ serde = { workspace = true }
serde_json = { workspace = true }
eyre = { workspace = true }
async-trait = { workspace = true }
babel-api = { workspace = true }

url = "2.5.7"
jsonrpsee = { workspace = true }

# HTTP server
axum = "0.8"
Expand Down
26 changes: 17 additions & 9 deletions crates/babel/bin/main.rs
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Expand Up @@ -13,10 +13,14 @@ struct Cli {
#[arg(long)]
rpc_url: String,

/// Server bind address
/// REST server bind address
#[arg(long, default_value = "127.0.0.1:3000")]
addr: String,

/// RPC server bind address
#[arg(long, default_value = "127.0.0.1:3001")]
rpc_addr: String,

/// Node name for metrics labels (defaults to hostname/IP from rpc_url)
#[arg(long)]
nodename: Option<String>,
Expand Down Expand Up @@ -56,29 +60,33 @@ async fn main() -> eyre::Result<()> {
nodename,
);

match cli.node_type.as_str() {
let server = match cli.node_type.as_str() {
"ethereum" => {
let babel = EthereumBabel::new(cli.rpc_url).await?;
let server = BabelServer::new(babel, nodename);
server.serve(&cli.addr).await?;
BabelServer::new(babel, nodename)
}
"ethereum_beacon" => {
let babel = EthereumBeaconBabel::new(cli.rpc_url);
let server = BabelServer::new(babel, nodename);
server.serve(&cli.addr).await?;
BabelServer::new(babel, nodename)
}
"cosmos" => {
let babel = CosmosBabel::new(cli.rpc_url);
let server = BabelServer::new(babel, nodename);
server.serve(&cli.addr).await?;
BabelServer::new(babel, nodename)
}
_ => {
return Err(eyre::eyre!(
"Unknown node type: {}. Supported types: ethereum, ethereum_beacon, cosmos",
cli.node_type
));
}
}
};

// Start RPC server in background
let rpc_addr = cli.rpc_addr.parse()?;
let (_rpc_handle, _rpc_local_addr) = babel::rpc::start_rpc_server(rpc_addr, server.cached_status()).await?;

// Start REST server
server.serve(&cli.addr).await?;

Ok(())
}
16 changes: 4 additions & 12 deletions crates/babel/src/lib.rs
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Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
use async_trait::async_trait;
use serde::{Deserialize, Serialize};

// Re-export Status from babel-api
pub use babel_api::Status;

/// Core trait for blockchain node health checks
#[async_trait]
Expand All @@ -8,21 +10,11 @@ pub trait Babel: Send + Sync {
async fn status(&self) -> eyre::Result<Status>;
}

/// Status response
#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct Status {
pub peers: u64,
pub current_block_number: u64,
pub is_syncing: bool,
pub latest_block_number: Option<u64>,
pub is_ready: bool,
pub is_healthy: bool,
}

pub mod cosmos;
pub mod ethereum;
pub mod ethereum_beacon;
pub mod metrics;
pub mod rpc;
pub mod server;
mod utils;

Expand Down
49 changes: 49 additions & 0 deletions crates/babel/src/rpc.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,49 @@
use babel_api::{BabelApiServer, Status};
use std::sync::Arc;
use tokio::sync::RwLock;

/// Implementation of the Babel RPC server
pub struct BabelRpcServer {
cached_status: Arc<RwLock<Option<Status>>>,
}

impl BabelRpcServer {
pub fn new(cached_status: Arc<RwLock<Option<Status>>>) -> Self {
Self { cached_status }
}
}

#[jsonrpsee::core::async_trait]
impl BabelApiServer for BabelRpcServer {
async fn status(&self) -> Result<Status, jsonrpsee::types::ErrorObjectOwned> {
self.cached_status
.read()
.await
.clone()
.ok_or_else(|| {
jsonrpsee::types::ErrorObjectOwned::owned(
1,
"Status not yet available",
None::<()>,
)
})
}
}

/// Start the RPC server
pub async fn start_rpc_server(
addr: std::net::SocketAddr,
cached_status: Arc<RwLock<Option<Status>>>,
) -> eyre::Result<(jsonrpsee::server::ServerHandle, std::net::SocketAddr)> {
use jsonrpsee::server::Server;

let server = Server::builder().build(addr).await?;
let local_addr = server.local_addr()?;

let rpc_server = BabelRpcServer::new(cached_status);
let handle = server.start(rpc_server.into_rpc());

tracing::info!("Babel RPC server listening on {}", local_addr);

Ok((handle, local_addr))
}
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