yatis 0.2.1

Yet Another T-bank Investment Sdk
Documentation 
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//! Simple rounding pool implementation
use std::future::Future;

use tokio::task::JoinHandle;

use crate::stream::{AnyStream, StartStream};
use crate::requestor::{AnyRequestor, OwnedSender};
use crate::StreamResponse;
/// Pool for invest api connections
/// # Examples:
/// ```rust
/// #[tokio::main]
/// async fn main() {
///    use yatis::*;
///    let token = std::env::var("SANDBOX_TOKEN").expect("need to set env var 'TOKEN'");
///    let api = yatis::SandboxApi::create_invest_service(token).unwrap();
///    let pool = ApiPool::new(api.clone());
///    pool.add(api); //now we have pool of 2 connections
///    trading(pool).await;
/// }
/// async fn trading(api: impl yatis::InvestApi) {
///     /* do some trading */
/// }
pub struct ApiPool<T>(deadqueue::unlimited::Queue<T>);

impl<Api: Send + 'static> ApiPool<Api> {
    pub fn new(api: Api) -> Self {
        let q = deadqueue::unlimited::Queue::new();
        q.push(api);
        Self(q)
    }
    pub fn add(&self, api: Api) {
        self.0.push(api);
    }
    pub async fn with_api<T, Fut: Future<Output=(impl Into<Api>, T)>, Fun: FnOnce(Api) -> Fut>(&self, fun: Fun) -> T where T: Send+Sized, Fut: Send{
        let api = self.0.pop().await;
        let (api, res) = fun(api).await;
        self.0.push(api.into());
        res
    }
}

impl<T:Clone> ApiPool<T> {
    pub async fn get(&self) -> T {
        let res = self.0.pop().await;
        self.0.push(res.clone());
        res
    }
}


impl<Api, Req, Res> OwnedSender<Req, Res> for ApiPool<Api> where Api: Send + 'static + OwnedSender<Req, Res>, Req: Send, Res: Send {
    /// Do not use it!
    fn send_and_back(self, req: Req) -> impl Future<Output = (Self,Result<Res, tonic::Status>)> {
        log::warn!("Don use ApiPool::send_and_back! Please, use ApiPool::send");
        Box::pin(async move{
            let res = self.send(req).await;
            (self, res)
        })
    }
    fn send(&self, req: Req) -> impl Future<Output = Result<Res, tonic::Status>> + Send{
        self.with_api(move |api|Box::pin(async move {
            api.send_and_back(req).await
        }))
    }
}

impl<Api, Req,T> StartStream<Req,T> for ApiPool<Api> where Api: StartStream<Req, T> + Clone + Send, Req: Send {
    fn start_stream<S>(&self, req: Req, sender: S) -> impl Future<Output=Result<JoinHandle<()>, tonic::Status>> + Send
    where S: futures::Sink<T> + Unpin + Send + 'static {
        Box::pin(async move {
            let api = self.0.pop().await;
            self.0.push(api.clone());
            api.start_stream(req, sender).await
        })
    }
}

impl<T: AnyRequestor + 'static> AnyRequestor for ApiPool<T> {}
impl<T: AnyStream<StreamResponse> + Clone> AnyStream<StreamResponse> for ApiPool<T> {}