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|
use std::{collections::HashMap, sync::Arc};
use log::{debug, error, warn};
use smol::lock::RwLock;
use karyon_core::{
async_util::{TaskGroup, TaskResult},
Executor,
};
use karyon_net::{Conn, Listener, ToListener};
use crate::{
codec::{Codec, CodecConfig},
message,
service::RPCService,
Endpoint, Error, Result, JSONRPC_VERSION,
};
pub const INVALID_REQUEST_ERROR_MSG: &str = "Invalid request";
pub const FAILED_TO_PARSE_ERROR_MSG: &str = "Failed to parse";
pub const METHOD_NOT_FOUND_ERROR_MSG: &str = "Method not found";
pub const INTERNAL_ERROR_MSG: &str = "Internal error";
fn pack_err_res(code: i32, msg: &str, id: Option<serde_json::Value>) -> message::Response {
let err = message::Error {
code,
message: msg.to_string(),
data: None,
};
message::Response {
jsonrpc: JSONRPC_VERSION.to_string(),
error: Some(err),
result: None,
id,
}
}
/// RPC server config
#[derive(Default)]
pub struct ServerConfig {
codec_config: CodecConfig,
}
/// Represents an RPC server
pub struct Server<'a> {
listener: Listener,
services: RwLock<HashMap<String, Box<dyn RPCService + 'a>>>,
task_group: TaskGroup<'a>,
config: ServerConfig,
}
impl<'a> Server<'a> {
/// Creates a new RPC server by passing a listener. It supports Tcp, Unix, and Tls.
pub fn new<T: ToListener>(listener: T, config: ServerConfig, ex: Executor<'a>) -> Arc<Self> {
Arc::new(Self {
listener: listener.to_listener(),
services: RwLock::new(HashMap::new()),
task_group: TaskGroup::new(ex),
config,
})
}
/// Returns the local endpoint.
pub fn local_endpoint(&self) -> Result<Endpoint> {
self.listener.local_endpoint().map_err(Error::KaryonNet)
}
/// Starts the RPC server
pub async fn start(self: Arc<Self>) -> Result<()> {
loop {
let conn = self.listener.accept().await?;
if let Err(err) = self.handle_conn(conn).await {
error!("Failed to handle a new conn: {err}")
}
}
}
/// Attach a new service to the RPC server
pub async fn attach_service(&self, service: impl RPCService + 'a) {
self.services
.write()
.await
.insert(service.name(), Box::new(service));
}
/// Shuts down the RPC server
pub async fn shutdown(&self) {
self.task_group.cancel().await;
}
/// Handles a new connection
async fn handle_conn(self: &Arc<Self>, conn: Conn) -> Result<()> {
let endpoint = conn.peer_endpoint()?;
debug!("Handle a new connection {endpoint}");
let on_failure = |result: TaskResult<Result<()>>| async move {
if let TaskResult::Completed(Err(err)) = result {
error!("Connection {} dropped: {}", endpoint, err);
} else {
warn!("Connection {} dropped", endpoint);
}
};
let codec = Codec::new(conn, self.config.codec_config.clone());
let selfc = self.clone();
self.task_group.spawn(
async move {
loop {
let mut buffer = vec![];
codec.read_until(&mut buffer).await?;
let response = selfc.handle_request(&buffer).await;
let mut payload = serde_json::to_vec(&response)?;
payload.push(b'\n');
codec.write_all(&payload).await?;
debug!("--> {response}");
}
},
on_failure,
);
Ok(())
}
/// Handles a request
async fn handle_request(&self, buffer: &[u8]) -> message::Response {
let rpc_msg = match serde_json::from_slice::<message::Request>(buffer) {
Ok(m) => m,
Err(_) => {
return pack_err_res(message::PARSE_ERROR_CODE, FAILED_TO_PARSE_ERROR_MSG, None);
}
};
debug!("<-- {rpc_msg}");
let srvc_method: Vec<&str> = rpc_msg.method.split('.').collect();
if srvc_method.len() != 2 {
return pack_err_res(
message::INVALID_REQUEST_ERROR_CODE,
INVALID_REQUEST_ERROR_MSG,
Some(rpc_msg.id),
);
}
let srvc_name = srvc_method[0];
let method_name = srvc_method[1];
let services = self.services.read().await;
let service = match services.get(srvc_name) {
Some(s) => s,
None => {
return pack_err_res(
message::METHOD_NOT_FOUND_ERROR_CODE,
METHOD_NOT_FOUND_ERROR_MSG,
Some(rpc_msg.id),
);
}
};
let method = match service.get_method(method_name) {
Some(m) => m,
None => {
return pack_err_res(
message::METHOD_NOT_FOUND_ERROR_CODE,
METHOD_NOT_FOUND_ERROR_MSG,
Some(rpc_msg.id),
);
}
};
let result = match method(rpc_msg.params.clone()).await {
Ok(res) => res,
Err(Error::ParseJSON(_)) => {
return pack_err_res(
message::PARSE_ERROR_CODE,
FAILED_TO_PARSE_ERROR_MSG,
Some(rpc_msg.id),
);
}
Err(Error::InvalidParams(msg)) => {
return pack_err_res(message::INVALID_PARAMS_ERROR_CODE, msg, Some(rpc_msg.id));
}
Err(Error::InvalidRequest(msg)) => {
return pack_err_res(message::INVALID_REQUEST_ERROR_CODE, msg, Some(rpc_msg.id));
}
Err(Error::RPCMethodError(code, msg)) => {
return pack_err_res(code, msg, Some(rpc_msg.id));
}
Err(_) => {
return pack_err_res(
message::INTERNAL_ERROR_CODE,
INTERNAL_ERROR_MSG,
Some(rpc_msg.id),
);
}
};
message::Response {
jsonrpc: JSONRPC_VERSION.to_string(),
error: None,
result: Some(result),
id: Some(rpc_msg.id),
}
}
}
|
