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|
use log::{ info, error, warn, trace };
use rust_tdlib::Tdlib;
use std::{
marker::PhantomData,
task::{ Waker, Context, Poll },
future::Future,
pin::Pin,
sync::{ Arc, Mutex },
thread,
};
use crossbeam::channel::{
self,
Sender,
Receiver,
};
use uuid::Uuid;
use std::collections::HashMap;
use serde_json::Value as JsonValue;
use crate::update::Handler;
use pert_types::methods::Method;
#[derive(Debug)]
pub struct RequestData {
resp: Option<JsonValue>,
waker: Option<Waker>,
}
type RequestDataRef = Arc<Mutex<RequestData>>;
#[derive(Debug)]
struct RequestDataToStream {
data: RequestDataRef,
req: JsonValue,
}
#[derive(Debug, Clone)]
pub struct RequestFuture<M: Method> {
_response_type_holder: PhantomData<M>,
pub data: RequestDataRef,
}
impl<M: Method> Future for RequestFuture<M> {
type Output = Result<M::Response, serde_json::error::Error>;
fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
let mut data = self.data.lock().unwrap();
if let Some(resp) = &data.resp {
Poll::Ready(serde_json::from_value(resp.clone()))
} else {
data.waker = Some(cx.waker().clone());
Poll::Pending
}
}
}
#[derive(Debug)]
enum JoinStreams {
NewRequest(RequestDataToStream),
NewResponse(String),
}
#[derive(Clone)]
pub struct Client {
//waker_handle: std::thread::JoinHandle<()>,
sender: Sender<JoinStreams>,
}
impl Client {
pub fn new<H: Handler>(log_opt: Option<i32>, updater: H) -> Self {
if let Some(log) = log_opt {
Tdlib::set_log_verbosity_level(log).ok();
}
let (tx, rx) = channel::unbounded();
let tx_for_tg = tx.clone();
let api = Arc::new(Tdlib::new());
let api_for_listener = api.clone();
let api_for_responder = api.clone();
let sender_for_responder = tx.clone();
let rt = tokio::runtime::Handle::try_current().expect("Must be in runtime");
let _run_handle = thread::spawn(
move || OneshotResponder::new(rx, api_for_responder).run(
updater, Self { sender: sender_for_responder }, rt
)
);
let _tg_handle = thread::spawn(
move || Self::listen_tg(tx_for_tg, api_for_listener, 1.0)
);
Self {
//waker_handle: _run_handle,
sender: tx,
}
}
pub fn send<R: Method>(&self, req: R) -> Result<RequestFuture<R>, serde_json::error::Error> {
let request = RequestData {
resp: None,
waker: None
};
let fut = RequestFuture {
_response_type_holder: PhantomData,
data: Arc::new(Mutex::new(request))
};
self.sender.send(JoinStreams::NewRequest(
RequestDataToStream {
data: fut.data.clone(),
req: serde_json::to_value(req.tag())?,
}
)).unwrap();
Ok(fut)
}
fn listen_tg(tx: Sender<JoinStreams>, api: Arc<Tdlib>, timeout: f64) {
loop {
if let Some(msg) = api.receive(timeout) {
tx.send(JoinStreams::NewResponse(msg)).unwrap();
} else {
info!("receive timed out");
}
}
}
}
#[derive(Debug)]
struct OneshotResponder {
api: Arc<Tdlib>,
wakers_map: HashMap<Uuid, RequestDataRef>,
rx: Receiver<JoinStreams>,
}
impl OneshotResponder {
fn new(rx: Receiver<JoinStreams>, api: Arc<Tdlib>) -> Self {
Self {
api: api,
wakers_map: HashMap::new(),
rx: rx
}
}
fn run<H: Handler>(&mut self, updater: H, client: Client, rt: tokio::runtime::Handle) {
loop {
match self.rx.recv() {
Ok(JoinStreams::NewRequest(req_data)) => {
let id = loop {
let id = Uuid::new_v4();
if self.wakers_map.contains_key(&id) {
continue;
} else {
break id;
}
};
let mut request = req_data.req;
if !request["@extra"].is_null() {
warn!("overwriting @extra in request");
}
request["@extra"] = id.to_hyphenated().to_string().into();
self.api.send(request.to_string().as_ref());
self.wakers_map.insert(id, req_data.data);
trace!("new req:\n{:#}", request);
},
Ok(JoinStreams::NewResponse(resp)) => {
match serde_json::from_str::<JsonValue>(resp.as_ref()) {
Ok(val) => {
let typ = val["@type"].as_str().unwrap();
if typ.starts_with("update") {
match serde_json::from_value(val.clone()) {
Ok(upd) => { rt.spawn(updater.handle(client.clone(), upd)); },
Err(err) => {
error!("Could not deser update: {}, was: {}", err, val);
}
};
} else {
self.handle_response(val);
}
},
Err(e) => {
warn!("ignoring invalid response. err: {}, resp: {}", e, resp);
}
}
},
Err(e) => {
error!("stream closed: {}", e);
error!("closing thread");
break;
}
}
}
}
fn handle_response(&mut self, resp: JsonValue) {
if let Some(id_str) = resp["@extra"].as_str() {
if let Ok(id) = Uuid::parse_str(id_str) {
let fut_extracted = self.wakers_map
.remove(&id)
.unwrap();
let mut fut_data = fut_extracted.lock().unwrap();
fut_data.resp = Some(resp);
fut_data
.waker.as_ref()
.and_then(|waker: &Waker| { waker.clone().wake(); Some(()) });
}
} else {
warn!("update has invalid @extra: {}", resp);
}
}
}
|
