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use std::{
collections::HashMap,
fmt::Debug,
net::{SocketAddr, TcpStream},
};
use std::io;
use std::sync::{Arc, Mutex};
use io::{BufReader, Write};
use protocol::RequestHeader;
use serde::de::DeserializeOwned;
const MAX_IPC_VERSION: u32 = 1;
mod coordinates;
mod members;
mod request;
mod stream;
pub mod protocol;
pub use request::RPCRequest;
pub use stream::RPCStream;
#[doc(hidden)]
pub struct SeqRead<'a>(&'a mut BufReader<TcpStream>);
impl<'a> SeqRead<'a> {
fn read_msg<T: DeserializeOwned + Debug>(mut self) -> T {
rmp_serde::from_read(&mut self.0).unwrap()
}
}
trait SeqHandler: 'static + Send + Sync {
fn handle(&self, res: RPCResult<SeqRead>);
fn streaming(&self) -> bool {
false
}
}
type RPCResult<T = ()> = Result<T, String>;
#[derive(Clone)]
pub struct Client {
dispatch: Arc<Mutex<DispatchMap>>,
tx: std::sync::mpsc::Sender<Vec<u8>>,
}
struct DispatchMap {
map: HashMap<u64, Arc<dyn SeqHandler>>,
next_seq: u64,
}
impl Client {
pub async fn connect(rpc_addr: SocketAddr, auth_key: Option<&str>) -> RPCResult<Self> {
let (tx, rx) = std::sync::mpsc::channel();
let dispatch = Arc::new(Mutex::new(DispatchMap {
map: HashMap::new(),
next_seq: 0,
}));
let client = Client { dispatch, tx };
let dispatch = Arc::downgrade(&client.dispatch);
std::thread::spawn(move || {
let mut stream = TcpStream::connect(rpc_addr).unwrap();
let mut reader = BufReader::new(stream.try_clone().unwrap());
std::thread::spawn(move || {
while let Ok(buf) = rx.recv() {
stream.write_all(&buf).unwrap();
}
});
while let Some(dispatch) = dispatch.upgrade() {
let protocol::ResponseHeader { seq, error } =
rmp_serde::from_read(&mut reader).unwrap();
let seq_handler = {
let mut dispatch = dispatch.lock().unwrap();
match dispatch.map.get(&seq) {
Some(v) => {
if v.streaming() {
v.clone()
} else {
dispatch.map.remove(&seq).unwrap()
}
}
None => {
continue;
}
}
};
let res = if error.is_empty() {
Ok(SeqRead(&mut reader))
} else {
Err(error)
};
seq_handler.handle(res);
}
});
client.handshake(MAX_IPC_VERSION).await?;
if let Some(auth_key) = auth_key {
client.auth(auth_key).await?;
}
return Ok(client);
}
fn deregister_seq_handler(&self, seq: u64) -> Option<Arc<dyn SeqHandler>> {
self.dispatch.lock().unwrap().map.remove(&seq)
}
fn send_command(&self, cmd: SerializedCommand, handler: Option<Arc<dyn SeqHandler>>) -> u64 {
let seq = {
let mut dispatch = self.dispatch.lock().unwrap();
let seq = dispatch.next_seq;
dispatch.next_seq += 1;
if let Some(handler) = handler {
dispatch.map.insert(seq, handler);
}
seq
};
let mut buf = rmp_serde::encode::to_vec_named(&RequestHeader {
command: cmd.name,
seq,
})
.unwrap();
buf.extend_from_slice(&cmd.body);
self.tx.send(buf).unwrap();
seq
}
pub async fn current_node_name(&self) -> RPCResult<String> {
Ok(self.stats().await?.agent.name)
}
}
struct SerializedCommand {
name: &'static str,
body: Vec<u8>,
}
#[doc(hidden)]
pub trait RPCResponse: Sized + Send + 'static {
fn read_from(read: SeqRead<'_>) -> RPCResult<Self>;
}
impl RPCResponse for () {
fn read_from(_: SeqRead<'_>) -> RPCResult<Self> {
Ok(())
}
}