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License: MIT License
An implementation of a socket.io client written in the Rust programming language.
License: MIT License
... and therefore revision 4 of Socket.IO protocol and revision 3 of Engine.IO protocol, behind feature gate I suppose.
The v3 server can communicate with v2 clients, but v3 client can't connect to a v2 server.
I'm still learning Rust and Socket.IO but I'd like to contribute if this seems good first issue,
this issue is meant to stand in as a low-priority to-do item for eventually
moving the test cases from original source files into a tests/
directory, it
may also be used to track the coverage of tests up until then and other
immediate testing related issues not specific to GH or CI/CD
Is it possible to specify the transport before initializing a connection? We have a service which only supports websocket connections and no long polling.
maybe this:
var client = io("https:xxx.com/",
transport = [websocket],
query = {"uuid" = ''});
// this become "wss:xxx.com/socket.io/?uuid=" in websocket url.
add a function like "query" in rust-socketio?
I'm looking for a socket io client crate that works on both wasm and native. Is this something you'd want to add?
How does the socket autoreconnect work,
or someone who does it implemented payment for the implementation thanks
๐๐ผ hello!
I've started experimenting with the crate this weekend and I'm having trouble integrating with a socketio server written in php. The Error
event is being triggered on every connection. I believe I've narrowed the error down to this section:
rust-socketio/src/engineio/transport.rs
Lines 191 to 230 in d2bdd32
What I'm seeing locally is this:
HandshakeError("\u{0}\u{1}\u{0}\u{1}๏ฟฝ0{\"sid\":\"c7f0f5c5b72fd8410429e568\",\"upgrades\":[\"websocket\"],\"pingInterval\":25000,\"pingTimeout\":60000}")
I can't tell why there's garbage in front of the JSON payload, but I'm able to connect to this same socketio server with a .NET implementation.
Has anyone used this for a project and would like to share an example for me that is a little more complex than the provided one? I need it for a project I'm working on but I can't figure out how to use the .on() functions to modify data that is scoped outside of it. I may be dumb, as my experience with rust is only novel but I've looked all over and don't see a way around this. For example, if I were to create a snake game and wanted to use this library for multiplayer how could I modify the snake struct inside of a socket .on method. I really just need one example of modifying data that isn't scoped to the .on function and ill be able to make my project work.
let mut snake = Snake{
x: 1,
y: 1,
};
ClientBuilder::new("http:://localhost:3001")
.namespace("/")
.on("update", |p,c|{
//get the position from the payload: Payload,
let new_pos_x = 4;
let new_pos_y = 4;
//this causes a error since the closure could outlive snake
snake.x = new_pos_x;
snake.y = new_pos_y;
})
.on("error", |err, _| eprintln!("Error: {:#?}", err))
.connect();
ps. This is just very very simple code I wrote to show what I'm talking about this is not how I would be actually structuring it.
Hi!
Is there any way to close or disconnect an existing socket?
Thanks in advance!
Hi!
Maybe I am asking for something really simple, but I have some lack of experience with callbacks in Rust. Consider the following code:
let ack_callback = |message: Payload, _| {
println!("Yehaa! My ack got acked?");
println!("Ack data: {:#?}", message);
message.to_string() // I want to return the result from the server to the caller
};
let json_payload = json!({"myAckData": 123});
// emit with an ack
let ack = socket
.emit_with_ack("test", json_payload, Duration::from_secs(2), ack_callback)
.expect("Server unreachable");
// Here I want somehow use the result from ack_callback
So the idea is simple: a user sends a request to the server and receives some valuable answer from a server. With the current design, it's a little bit unclear to me, what is the best way to return a result to the user. Try to use channels? Pass an Arc<Mutex<Option<ResultType>>>
to the callback and on the caller, side wait with a busy loop a result? Anything else? Did I miss some useful pattern here?
If you are interested, what I am trying to do - I am trying to port this piece of JS library to Rust: https://github.com/dplusic/GameLift-Nodejs-ServerSDK/blob/master/src/Server/AuxProxyMessageSender.ts#L173
I hope my question is clear :) Thanks in advance!
My code runs in a tokio runtime with #[tokio::main(flavor = "multi_thread", worker_threads = 4)]
connecting to a server as shown in the examples causes
thread 'main' panicked at 'Cannot drop a runtime in a context where blocking is not allowed. This happens when a runtime is dropped from within an asynchronous context.', /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.12.0/src/runtime/blocking/shutdown.rs:51:21
stack backtrace:
0: std::panicking::begin_panic
at /rustc/09c42c45858d5f3aedfa670698275303a3d19afa/library/std/src/panicking.rs:543:12
1: tokio::runtime::blocking::shutdown::Receiver::wait
at /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.12.0/src/runtime/blocking/shutdown.rs:51:21
2: tokio::runtime::blocking::pool::BlockingPool::shutdown
at /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.12.0/src/runtime/blocking/pool.rs:145:12
3: <tokio::runtime::blocking::pool::BlockingPool as core::ops::drop::Drop>::drop
at /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.12.0/src/runtime/blocking/pool.rs:162:9
4: core::ptr::drop_in_place<tokio::runtime::blocking::pool::BlockingPool>
at /rustc/09c42c45858d5f3aedfa670698275303a3d19afa/library/core/src/ptr/mod.rs:188:1
5: core::ptr::drop_in_place<tokio::runtime::Runtime>
at /rustc/09c42c45858d5f3aedfa670698275303a3d19afa/library/core/src/ptr/mod.rs:188:1
6: reqwest::blocking::wait::enter
at /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/reqwest-0.11.7/src/blocking/wait.rs:76:21
7: reqwest::blocking::wait::timeout
at /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/reqwest-0.11.7/src/blocking/wait.rs:13:5
8: reqwest::blocking::client::ClientHandle::new
at /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/reqwest-0.11.7/src/blocking/client.rs:996:15
9: reqwest::blocking::client::ClientBuilder::build
at /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/reqwest-0.11.7/src/blocking/client.rs:103:9
10: reqwest::blocking::client::Client::new
at /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/reqwest-0.11.7/src/blocking/client.rs:798:9
11: rust_engineio::transports::polling::PollingTransport::new
at /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/rust_engineio-0.3.1/src/transports/polling.rs:36:29
12: rust_engineio::client::client::ClientBuilder::handshake
at /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/rust_engineio-0.3.1/src/client/client.rs:142:25
13: rust_engineio::client::client::ClientBuilder::build
at /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/rust_engineio-0.3.1/src/client/client.rs:153:9
14: rust_engineio::client::client::ClientBuilder::build_with_fallback
at /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/rust_engineio-0.3.1/src/client/client.rs:262:22
15: rust_socketio::client::builder::ClientBuilder::connect_manual
at /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/rust_socketio-0.3.1/src/client/builder.rs:256:35
16: rust_socketio::client::builder::ClientBuilder::connect
at /home/samthomas/.cargo/registry/src/github.com-1ecc6299db9ec823/rust_socketio-0.3.1/src/client/builder.rs:217:22
17: sf_edge_gateway::send::start_send::{{closure}}
The connection does happen from within an async function(# 17) . Any suggestions on how to approach this? I see that reqwest is trying to create its own tokio runtime internally beacuse this library uses a blocking version.
Hi! @1c3t3a
My server emits an event and is expecting a return value from the receiving client.
server code is python:
https://python-socketio.readthedocs.io/en/latest/api.html#server-class
Server.call
Emit a custom event to a client and wait for the response.
python:
sio.call('test', data="a", sid=sid, timeout=3)
...
Traceback (most recent call last):
raise exceptions.TimeoutError()
socketio.exceptions.TimeoutError
rust-socketio:
let callback = |payload: Payload, socket: Client| {
match payload {
Payload::String(str) => println!("Received: {}", str),
Payload::Binary(bin_data) => println!("Received bytes: {:#?}", bin_data),
}
// How to return a value !!!
};
let socket = ClientBuilder::new("http://localhost:4200")
.namespace("/")
.auth(json!(""))
.on("test", callback)
.on("error", |err, _| eprintln!("Error: {:#?}", err))
.connect()
.expect("Connection failed");
HelpHelpHelp,Thanks.
0.3.X:
Until now this crate only provides a socketio client. A possible server implementation could use the same packet parser and maybe parts of the engine.io socket.
In Javascript client that works like:
socket.on('*', handler);
Without this it is required for the client to always know all events that the server can emit and set up separate handlers to all of them.
When connecting with HTTPS to a Flask SocketIO server I'm seeing a slowdown of 20 seconds waiting for a response compared to http.
This is happening with header auth and with certificate auth.
let socket = SocketBuilder::new("https://$IP$".to_string())
.opening_header(
"Authorization",
settings.header_auth_value.as_str()
)
.on("open", connect_callback)
.on("submit", submit_callback)
.on("error", |err, _| {
warn!("Server Connection Error: {:#?}", err)
})
.on("error", |err, _| eprintln!("Error: {:#?}", err))
// .transport_type(TransportType::WebsocketUpgrade)
// .tls_config(tls_connector)
.connect();
I can see in the nginx logs that the websocket upgrade is switching protocols
client GET /socket.io/?EIO=4&sid=n4wlLsEmzjqGaiGHAAAG&transport=websocket HTTP/1.1 101 45
Any ideas on what could be going wrong?
PS. Not seeing this degradation with python socket io client
The documentation talks about different 'layers' for transporting which are:
I currently implemented long-polling, but feel free to extend the transport enum in engineio/transport.rs.
Seems like there is only a field for one attachment (and only one stored), despite storing how many attachments a packet has. Was there a reason for this @1c3t3a or is it just not implemented yet?
TODO:
This library currently uses the websocket crate. However the library looks kind of abandoned and might not be the best fit for future plans like async / await
support. Currently the library provides async support based on tokio
0.1. This could lead to problems and there are no real plans to get the support running with websocket (see #242). It's also not to be expected that the library will provide support in case we have a problem, so switching the library might be a good idea. A battle proven implementation is provided by tungstenite-rs
(async here, blocking here). What do you think @nshaaban-cPacket?
The Client.emit and Client.emit_with_ack only seem to support a single data parameter
This causes issues for servers who are expecting multiple parameters for the data for these events
rust.rs
socket.emit_with_ack("foo", json!("{ack:true}", duration, callback)
example_socketio_server.js
socket.on("foo", async (userId, body, callback)=>{})
no mater what is placed in data, it will place all data under the "userId" and no way to populate the body parameter.
Is there a workaround that could fix this?
Currently tarpaulin has some issues detecting dangling or formatted lines, see #351. This lead to some issues in #44 where the diff target was hit. I reconfigured the CI to shut up, but we should change it back as soon as tarpaulin is stable. The old config looked like this:
coverage:
status:
project:
default:
target: auto
threshold: 2%
paths:
- "src"
branches:
- main
if_ci_failed: ignore
informational: false
only_pulls: false
This might sound very general, but I'm thankful for any help. I already added some TODO flags to parts of the code where a deeper review makes sense. In case you find something odd or unusual, just comment this issue, or even better: commit a PR with a proposed fix.
My string payload contains weird characters for returned unicode symbols.
For example I should receive 'โข', I am getting 'รข๏ฟฝยข', and for 'โ ' I am getting 'รข๏ฟฝ๏ฟฝ'.
I've tried everything but with no success so I am now manually replacing them. I am pretty new to rust and to low level programming, so I might be doing something wrong.
For some reason, requests only go through sometimes and with little consistency. Im not too sure why? Maybe because its upgrading but Im a bit stuck...
Client-side Code
use rust_socketio::{Payload, Socket, SocketBuilder};
use serde_json::json;
fn main() {
let callback = |payload: Payload, mut socket: Socket| {
match payload {
Payload::String(str) => println!("Received: {}", str),
Payload::Binary(bin_data) => println!("Received bytes: {:#?}", bin_data),
}
socket
.emit("message", json!("aquired"))
.expect("Server unreachable")
};
let mut socket = SocketBuilder::new("https://censored.herokuapp.com")
.on("message", callback)
.on("error", |err, _| eprintln!("Error: {:#?}", err))
.connect()
.expect("Connection failed");
socket.emit("message", json!("cool message one")).expect("Server unreachable");
socket.emit("message", json!("cool message two")).expect("Server unreachable");
socket.emit("message", json!("cool message three")).expect("Server unreachable");
socket.emit("message", json!("cool message four")).expect("Server unreachable");
}
Serverside Code
const cors = require('cors');
const app = require('express')();
const http = require('http').Server(app);
const io = require('socket.io')(http, {
allowEIO3: true,
cors: {
origin: "*"
}
});
const port = process.env.PORT || 3000;
io.on('connection', (socket) => {
console.log("user connect");
socket.on('message', function(data) {
io.emit('message', data);
console.log(data);
});
socket.on('clear', function clear() {
io.emit('clear');
});
});
http.listen(port, () => {
console.log(`Socket.IO server running at http://localhost:${port}/`);
});
My server emits an event and is expecting a return value from the receiving client. I see there is emit_with_ack()
, but can I somehow send a payload when processing an incoming event?
Hi there,
I am studying the rust-socketio crate. In my case, I need to join a socket.io room and leave this room when something happened,
so I want to known, how to join and leave a special socket.io room, I didn't found the rust functions.
Thanks for a lot.
I a using your great library, but my applications panics after some time (seems to be random ~10-30 secs after startup) with the following backtrace:
thread '<unnamed>' panicked at 'EngineIO Error', /home/mawoka/.cargo/registry/src/github.com-1ecc6299db9ec823/rust_socketio-0.3.0/src/client/builder.rs:229:21
stack backtrace:
0: 0x557646368a8c - std::backtrace_rs::backtrace::libunwind::trace::hd70f18a67bf1064d
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
1: 0x557646368a8c - std::backtrace_rs::backtrace::trace_unsynchronized::hed700f39aaa9560e
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x557646368a8c - std::sys_common::backtrace::_print_fmt::h05ffc8c800d3fd6e
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/sys_common/backtrace.rs:66:5
3: 0x557646368a8c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hc3335dc9ac9ea141
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/sys_common/backtrace.rs:45:22
4: 0x5576463904dc - core::fmt::write::h8ba7e47d56fb9287
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/core/src/fmt/mod.rs:1190:17
5: 0x557646362018 - std::io::Write::write_fmt::hcc4602e4a7d8cb4e
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/io/mod.rs:1657:15
6: 0x55764636ace7 - std::sys_common::backtrace::_print::hfefb27db9027fc13
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/sys_common/backtrace.rs:48:5
7: 0x55764636ace7 - std::sys_common::backtrace::print::h3b5c5f5af201c47a
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/sys_common/backtrace.rs:35:9
8: 0x55764636ace7 - std::panicking::default_hook::{{closure}}::h9364b8e096329e42
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/panicking.rs:295:22
9: 0x55764636a99f - std::panicking::default_hook::hbb3fd2f25c08d7b9
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/panicking.rs:314:9
10: 0x55764636b43b - std::panicking::rust_panic_with_hook::hb8806bff47a676e3
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/panicking.rs:698:17
11: 0x55764636b127 - std::panicking::begin_panic_handler::{{closure}}::h9d9d57a8e207ec62
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/panicking.rs:588:13
12: 0x557646368f54 - std::sys_common::backtrace::__rust_end_short_backtrace::h41203f137e127a88
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/sys_common/backtrace.rs:138:18
13: 0x55764636ae39 - rust_begin_unwind
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/panicking.rs:584:5
14: 0x557645918b73 - core::panicking::panic_fmt::h472b827f82d8bfa4
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/core/src/panicking.rs:142:14
15: 0x557645b4c104 - core::panicking::panic_display::h2419126f417c20d1
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/core/src/panicking.rs:73:5
16: 0x557645b4585a - rust_socketio::client::builder::ClientBuilder::connect::{{closure}}::h887cc7cd172ebccc
at /home/mawoka/.cargo/registry/src/github.com-1ecc6299db9ec823/rust_socketio-0.3.0/src/client/builder.rs:229:21
17: 0x557645b53310 - std::sys_common::backtrace::__rust_begin_short_backtrace::haf4ad59f77837423
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/sys_common/backtrace.rs:122:18
18: 0x557645b3ed4d - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::h9fc04ac80e2aa3df
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/thread/mod.rs:498:17
19: 0x557645b3d991 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h013c64b8db9e80d3
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/core/src/panic/unwind_safe.rs:271:9
20: 0x557645b4c439 - std::panicking::try::do_call::h5e086d5aed2793f2
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/panicking.rs:492:40
21: 0x557645b4c8eb - __rust_try
22: 0x557645b4c371 - std::panicking::try::h1cf7f936c2d9e65d
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/panicking.rs:456:19
23: 0x557645b3d491 - std::panic::catch_unwind::h3e2a3829123712dc
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/panic.rs:137:14
24: 0x557645b3eb57 - std::thread::Builder::spawn_unchecked_::{{closure}}::h9f4f924223a945bc
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/thread/mod.rs:497:30
25: 0x557645b4431f - core::ops::function::FnOnce::call_once{{vtable.shim}}::hfa8076f56c9bb1ad
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/core/src/ops/function.rs:227:5
26: 0x557646371163 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h78e3a4498542e3c1
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/alloc/src/boxed.rs:1854:9
27: 0x557646371163 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h350da154130e2756
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/alloc/src/boxed.rs:1854:9
28: 0x557646371163 - std::sys::unix::thread::Thread::new::thread_start::h918df3b0ffbb0232
at /rustc/68369a041cea809a87e5bd80701da90e0e0a4799/library/std/src/sys/unix/thread.rs:108:17
29: 0x7fc67ed715c2 - start_thread
30: 0x7fc67edf6584 - __clone
31: 0x0 - <unknown>
It's probably just me, doing something completely wrong, but I think that it still shouldn't panic.
Thanks for your help!
Till now the binary messages are ignored. This should be changed.
This is a very important issue to tackle, as I found myself multiple times in the situation where I needed to debug the javascript socket.io server.
Javascript socket.io client can emit plain text. rust_socketio
currently is not capable of.
client.emit('message-received', data); // javascript
For example on
will received a payload. can not just emit that payload back when it is plain text.
currently should use json!()
macro to encode.
let socket = ClientBuilder::new("http://localhost:4200")
.namespace("/admin")
.on("message-received", |p, socket| {
let s = match &p {
Payload::String(s) => s,
_ => "",
};
println!("message-received {:?}", s);
let _ = socket.emit("utf-8โข", p); // will failed
})
.connect()
because of this function
rust-socketio/socketio/src/socket.rs
Lines 84 to 118 in 4eea9b7
this line
rust-socketio/socketio/src/socket.rs
Line 105 in 4eea9b7
Is it possible to set a timeout on an emitted event?
I didn't see anything about timeouts in the documentation.
I am experiencing problems trying to connect to a service, but being new to both socket.io and Rust I continuously get lost debugging.
I have little documentation about the service (it's a Beta API under development), and only know the bare minimum.
My problem might be caused by a misconfiguration of the service, but I don't know how to determine if that's the case.
When I try connecting, I get some encouraging log statements, and then suddenly the error mentioned in the title and things stop (see logs below).
Attempting to curl the last URL gives this output:
96:0{"sid":"xxxxxxxxxxxxxxxxxxxx","upgrades":["websocket"],"pingInterval":25000,"pingTimeout":5000}2:40
Digging into various docs, this looks like it might be using the engine.io v3 protocol, while it looks like rust-socketio 0.3.1 uses/expects engine.io v4?
Is it possible to downgrade my client somehow?
Apologies for the vague issue description, I'm not really sure what I'm doing ๐
Caused by:
Invalid packet id: 57
Process finished with exit code 1
</details>
Further investigate the handling and use of the following features:
There is already the file example/engine.io.js file that could be run via node in order to start up a server. I currently use it to test the client, but not in an automated way.
Development on hold, someone else is welcome to take over
It's that time @1c3t3a , might want to make a branch. How servers are implemented informs discussion about what the best interface method is (for 0.3.X).
TBD:
Being able to add extra headers when connecting would be very useful!
Currently only connection via http is possible, it would be nice (and secure) to connect via https
(and wss
later). This might also affect the current way of parsing an URL, which is currently done inside each method. It might be nice to receive something like an Into<Url>
type. This also makes the API more flexible for the user.
The typical socket.io example is a chat server. This tackles the concept of namespaces as well as a persistent communication with multiple clients. If you're looking for the server-side code, have a look here: https://github.com/socketio/socket.io/tree/master/examples/chat
if the server down without send close packet, rust_socketio
can not call .on(Event::Close, |_, _| {})
callback.
the socket.io-client
will do that
Some APIs require authentication by query parameters (e.g. FXCM REST API) by appending a &key=val to the url. In said case this is only required once on login to get session authentication infos and not part of every request.
I have the exact same issue as closed issue #166. Are there any updates? I am not sure why it was closed.
EDIT: Something else I noticed it that I don't receive events from the server anymore after some time.
From what I have seen, most client libraries support auto-reconnects. It would be really nice to have this ๐
I need revision 3 of the engine.io protocol support. because i am using the server that uses revision 3 of the engine.io protocol.
Currently those methods receive a Vec<u8>
, it might be better to work directly on [u8]
or otherwise Bytes
. This should not be a very extensive task.
like js client, should buffer the emit, resend if reconnect success.
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