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|
//! Client consists of n + 1 threads:
//! * one is communicating with tdlib api (api thread)
//! * n threads, sending requests to the api thread through crossbeam channel.
//!
//! when Client::send is called:
//! - creates
//! * api thread receives Request:
//! - adds `@extra` field to request
//! - sends modified request to tdlib
//! * sending thread returns future,
//! that has a reference to the (not yet filled) response
//!
pub(crate) mod client_builder;
mod responder;
use crate::raw_ptr::TdPtr;
use crate::update::Handler;
use crossbeam::channel::{self, Sender};
use log::error;
use serde::{de::DeserializeOwned, ser::Serialize};
use serde_json::Value as JsonValue;
use std::{
future::Future,
marker::PhantomData,
pin::Pin,
sync::{Arc, Mutex},
task::{Context, Poll, Waker},
thread,
};
#[derive(Debug, Clone)]
pub struct Response {
resp: Option<JsonValue>,
waker: Option<Waker>,
}
impl Response {
pub fn new_empty() -> Self {
Self {
resp: None,
waker: None,
}
}
}
type SafeResponse = Arc<Mutex<Response>>;
pub trait Request: Serialize {
/// Tag request with type
/// TDLib infers type from @type field of sent json, so `tag` should insert
/// this field into the value.
fn tag(&self) -> crate::error::Result<JsonValue>;
/// Convenience method to tag json made from self
fn tag_json<S: AsRef<str>>(&self, type_: S) -> crate::error::Result<JsonValue> {
let mut self_json = serde_json::to_value(self)?;
if self_json.get("@type").is_some() {
return Err(crate::error::Error::HasTypeInJson);
}
self_json["@type"] = type_.as_ref().into();
Ok(self_json)
}
}
impl Request for JsonValue {
fn tag(&self) -> crate::error::Result<JsonValue> {
if !self["@type"].is_string() {
return Err(crate::error::Error::HasNoTypeInJson);
}
Ok(self.clone())
}
}
#[derive(Debug, Clone)]
pub struct ResponseFuture<R: DeserializeOwned> {
response_type_holder: PhantomData<R>,
pub response: SafeResponse, // TODO: maybe it is possible to make this lockless
}
impl<R: DeserializeOwned> Future for ResponseFuture<R> {
type Output = Result<R, serde_json::error::Error>;
fn poll(self: Pin<&mut Self>, ctx: &mut Context) -> Poll<Self::Output> {
let mut data = self.response.lock().unwrap();
if let Some(resp) = data.resp.clone() {
/* ^^^^^^^^
* TODO: at this point _this thread_ is the only owner of response,
* so it is safe to get `resp` without cloning
*/
Poll::Ready(serde_json::from_value(resp.clone()))
} else {
data.waker = Some(ctx.waker().clone());
Poll::Pending
}
}
}
#[derive(Debug)]
pub(crate) enum JoinStreams {
NewRequest((JsonValue, SafeResponse)),
NewResponse(String),
}
#[derive(Clone, Debug)]
pub struct Client {
sender: Sender<JoinStreams>,
}
impl Client {
pub(crate) fn new<H: Handler>(updater: H, timeout: f64) -> Self {
let (tx, rx) = channel::unbounded();
let api = Arc::new(TdPtr::new());
let rt = tokio::runtime::Handle::try_current().expect("must be in runtime");
let _responder_handle = {
let api = api.clone();
let tx = tx.clone();
thread::spawn(move || responder::OneshotResponder::new(rx, api, updater, tx, rt).run())
};
let _tg_handle = {
let api = api.clone();
let tx = tx.clone();
thread::spawn(move || loop {
if let Some(msg) = api.receive(timeout) {
if tx.send(JoinStreams::NewResponse(msg)).is_err() {
error!("channel is closed. stopping receiver");
break;
}
}
});
};
Self { sender: tx }
}
pub fn send<Req: Request, Resp: DeserializeOwned>(
&self,
req: Req,
) -> crate::error::Result<ResponseFuture<Resp>> {
let fut = ResponseFuture {
response_type_holder: PhantomData,
response: Arc::new(Mutex::new(Response::new_empty())),
};
self.sender.send(JoinStreams::NewRequest((
serde_json::to_value(req.tag()?)?,
fut.response.clone(),
)))?;
Ok(fut)
}
/// [`send`] specification to return JsonValue. Intended to be used, when return value is not used.
/// Effective return type (now `serde_json::Value`) may be changed in future
pub fn send_forget<Req: Request>(
&self,
req: Req,
) -> crate::error::Result<ResponseFuture<JsonValue>> {
self.send(req)
}
}
|
