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use crate::types::*;
use chashmap::CHashMap;
use futures::channel::*;
use futures::prelude::*;
use futures_boxed::boxed;
use serde::Serialize;
use serde_json::json;
use std::sync::atomic::{AtomicU64, Ordering};
pub type Result<T> = std::result::Result<T, Error>;
pub trait ResponseHandler {
#[boxed]
async fn handle(&self, response: Response);
}
pub struct Client {
output: mpsc::Sender<String>,
request_id: AtomicU64,
senders_by_id: CHashMap<Id, oneshot::Sender<Result<serde_json::Value>>>,
}
impl Client {
pub fn new(output: mpsc::Sender<String>) -> Self {
Client {
output,
request_id: AtomicU64::new(0),
senders_by_id: CHashMap::new(),
}
}
pub async fn send_request<T: Serialize>(
&self,
method: String,
params: T,
) -> Result<serde_json::Value> {
let id = self.request_id.fetch_add(1, Ordering::SeqCst);
let request = Request::new(method, json!(params), Id::Number(id));
let (result_tx, result_rx) = oneshot::channel();
self.senders_by_id.insert(request.id.clone(), result_tx);
self.send(Message::Request(request)).await;
result_rx.await.unwrap()
}
pub async fn send_notification<T: Serialize>(&self, method: String, params: T) {
let notification = Notification::new(method, json!(params));
self.send(Message::Notification(notification)).await;
}
async fn send(&self, message: Message) {
let mut output = self.output.clone();
let json = serde_json::to_string(&message).unwrap();
output.send(json).await.unwrap();
}
}
impl ResponseHandler for Client {
#[boxed]
async fn handle(&self, response: Response) {
let id = response.id.expect("Expected response with id");
let result = match response.error {
Some(why) => Err(why),
None => Ok(response.result.unwrap_or(serde_json::Value::Null)),
};
let result_tx = self
.senders_by_id
.remove(&id)
.expect("Unexpected response received");
result_tx.send(result).unwrap();
}
}
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