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use std::{collections::HashMap, sync::Arc, task::Waker};
use super::Client;
use crate::{raw_ptr::TdPtr, Handler};
use super::{JoinStreams, SafeResponse};
use crossbeam::channel::{Receiver, Sender};
use log::{error, trace, warn};
use serde_json::Value as JsonValue;
/// Oneshot means it forgets any information about particular request
/// when receives response:
/// it once stores waker of the future;
/// when response arrives, it stores response and wakes the waker once,
/// dropping waker.
#[derive(Debug)]
pub(crate) struct OneshotResponder<H: Handler> {
api: Arc<TdPtr>,
wakers_map: HashMap<u64, SafeResponse>,
rx: Receiver<JoinStreams>,
/// sequential id to be used as a unique identifier of request
/// used to match request with response
next_id: u64,
updater: H,
client: Client,
rt: tokio::runtime::Handle,
}
#[derive(Debug)]
enum TgResponseType {
Update,
Error,
Response,
}
impl TgResponseType {
fn from_type<'a>(type_: &'a str) -> Self {
if type_.starts_with("update") {
Self::Update
} else if type_ == "error" {
Self::Error
} else {
Self::Response
}
}
}
impl<H: Handler> OneshotResponder<H> {
pub(crate) fn new(
rx: Receiver<JoinStreams>,
api: Arc<TdPtr>,
updater: H,
tx: Sender<JoinStreams>,
rt: tokio::runtime::Handle,
) -> Self {
Self {
api,
wakers_map: HashMap::new(),
rx,
next_id: 0,
updater,
client: Client { sender: tx },
rt,
}
}
pub(crate) fn run(&mut self) {
loop {
match self.rx.recv() {
Ok(JoinStreams::NewRequest((mut request, fut_ref))) => {
let id = self.next_id;
self.next_id += 1;
if !request["@extra"].is_null() {
warn!("overwriting @extra in request");
}
request["@extra"] = id.into();
self.api.send(request.to_string().as_ref()).ok();
self.wakers_map.insert(id, fut_ref);
trace!("new req:\n{:#}", request);
}
Ok(JoinStreams::NewResponse(resp)) => {
match serde_json::from_str::<JsonValue>(&resp) {
Ok(val) => {
use crate::value_ext::ValueExt;
let type_ = val.get_type().map(TgResponseType::from_type);
match type_ {
Ok(TgResponseType::Update) => {
self.rt
.spawn(self.updater.handle_json(self.client.clone(), val));
}
Ok(TgResponseType::Response) => {
self.handle_response(val);
}
Ok(TgResponseType::Error) => {
self.handle_error(val);
}
Err(e) => {
error!("response has invalid @type: {}. Be aware, that this could lock execution flow", e);
}
}
}
Err(e) => {
warn!("ignoring invalid response. err: {}, resp: {}", e, resp);
}
}
}
Err(e) => {
error!("stream closed: {}", e);
error!("closing responder thread");
// this will return from function and effectively end thread
break;
}
}
}
}
fn handle_error(&mut self, resp: JsonValue) {
if let Some(id) = resp["@extra"].as_u64() {
if let Some(fut) = self.wakers_map.remove(&id) {
let mut fut_data = fut.lock().unwrap();
fut_data.resp = Some(resp);
fut_data.waker.as_ref().map(Waker::wake_by_ref);
} else {
warn!(
"response received, but request was not issued by any future: {}",
resp
);
}
} else {
warn!("response has invalid @extra: {}", resp);
}
}
fn handle_response(&mut self, resp: JsonValue) {
if let Some(id) = resp["@extra"].as_u64() {
if let Some(fut) = self.wakers_map.remove(&id) {
let mut fut_data = fut.lock().unwrap();
fut_data.resp = Some(resp);
fut_data.waker.as_ref().map(Waker::wake_by_ref);
} else {
warn!(
"response received, but request was not issued by any future: {}",
resp
);
}
} else {
warn!("response has invalid @extra: {}", resp);
}
}
}
|
