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tungstenite-rs
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tungstenite-rs/src/protocol/mod.rs

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//! Generic WebSocket message stream.
pub mod frame;
mod message;
pub use self::{frame::CloseFrame, message::Message};
use log::*;
use std::{
collections::VecDeque,
io::{ErrorKind as IoErrorKind, Read, Write},
mem::replace,
};
use self::{
frame::{
coding::{CloseCode, Control as OpCtl, Data as OpData, OpCode},
Frame, FrameCodec,
},
message::{IncompleteMessage, IncompleteMessageType},
};
use crate::{
error::{Error, ProtocolError, Result},
util::NonBlockingResult,
};
/// Indicates a Client or Server role of the websocket
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Role {
/// This socket is a server
Server,
/// This socket is a client
Client,
}
/// The configuration for WebSocket connection.
#[derive(Debug, Clone, Copy)]
pub struct WebSocketConfig {
/// The size of the send queue. You can use it to turn on/off the backpressure features. `None`
/// means here that the size of the queue is unlimited. The default value is the unlimited
/// queue.
pub max_send_queue: Option<usize>,
/// The maximum size of a message. `None` means no size limit. The default value is 64 MiB
/// which should be reasonably big for all normal use-cases but small enough to prevent
/// memory eating by a malicious user.
pub max_message_size: Option<usize>,
/// The maximum size of a single message frame. `None` means no size limit. The limit is for
/// frame payload NOT including the frame header. The default value is 16 MiB which should
/// be reasonably big for all normal use-cases but small enough to prevent memory eating
/// by a malicious user.
pub max_frame_size: Option<usize>,
/// When set to `true`, the server will accept and handle unmasked frames
/// from the client. According to the RFC 6455, the server must close the
/// connection to the client in such cases, however it seems like there are
/// some popular libraries that are sending unmasked frames, ignoring the RFC.
/// By default this option is set to `false`, i.e. according to RFC 6455.
pub accept_unmasked_frames: bool,
}
impl Default for WebSocketConfig {
fn default() -> Self {
WebSocketConfig {
max_send_queue: None,
max_message_size: Some(64 << 20),
max_frame_size: Some(16 << 20),
accept_unmasked_frames: false,
}
}
}
/// WebSocket input-output stream.
///
/// This is THE structure you want to create to be able to speak the WebSocket protocol.
/// It may be created by calling `connect`, `accept` or `client` functions.
#[derive(Debug)]
pub struct WebSocket<Stream> {
/// The underlying socket.
socket: Stream,
/// The context for managing a WebSocket.
context: WebSocketContext,
}
impl<Stream> WebSocket<Stream> {
/// Convert a raw socket into a WebSocket without performing a handshake.
///
/// Call this function if you're using Tungstenite as a part of a web framework
/// or together with an existing one. If you need an initial handshake, use
/// `connect()` or `accept()` functions of the crate to construct a websocket.
pub fn from_raw_socket(stream: Stream, role: Role, config: Option<WebSocketConfig>) -> Self {
WebSocket { socket: stream, context: WebSocketContext::new(role, config) }
}
/// Convert a raw socket into a WebSocket without performing a handshake.
///
/// Call this function if you're using Tungstenite as a part of a web framework
/// or together with an existing one. If you need an initial handshake, use
/// `connect()` or `accept()` functions of the crate to construct a websocket.
pub fn from_partially_read(
stream: Stream,
part: Vec<u8>,
role: Role,
config: Option<WebSocketConfig>,
) -> Self {
WebSocket {
socket: stream,
context: WebSocketContext::from_partially_read(part, role, config),
}
}
/// Returns a shared reference to the inner stream.
pub fn get_ref(&self) -> &Stream {
&self.socket
}
/// Returns a mutable reference to the inner stream.
pub fn get_mut(&mut self) -> &mut Stream {
&mut self.socket
}
/// Change the configuration.
pub fn set_config(&mut self, set_func: impl FnOnce(&mut WebSocketConfig)) {
self.context.set_config(set_func)
}
/// Read the configuration.
pub fn get_config(&self) -> &WebSocketConfig {
self.context.get_config()
}
/// Check if it is possible to read messages.
///
/// Reading is impossible after receiving `Message::Close`. It is still possible after
/// sending close frame since the peer still may send some data before confirming close.
pub fn can_read(&self) -> bool {
self.context.can_read()
}
/// Check if it is possible to write messages.
///
/// Writing gets impossible immediately after sending or receiving `Message::Close`.
pub fn can_write(&self) -> bool {
self.context.can_write()
}
}
impl<Stream: Read + Write> WebSocket<Stream> {
/// Read a message from stream, if possible.
///
/// This will queue responses to ping and close messages to be sent. It will call
/// `write_pending` before trying to read in order to make sure that those responses
/// make progress even if you never call `write_pending`. That does mean that they
/// get sent out earliest on the next call to `read_message`, `write_message` or `write_pending`.
///
/// ## Closing the connection
/// When the remote endpoint decides to close the connection this will return
/// the close message with an optional close frame.
///
/// You should continue calling `read_message`, `write_message` or `write_pending` to drive
/// the reply to the close frame until [Error::ConnectionClosed] is returned. Once that happens
/// it is safe to drop the underlying connection.
pub fn read_message(&mut self) -> Result<Message> {
self.context.read_message(&mut self.socket)
}
/// Send a message to stream, if possible.
///
/// WebSocket will buffer a configurable number of messages at a time, except to reply to Ping
/// requests. A Pong reply will jump the queue because the
/// [websocket RFC](https://tools.ietf.org/html/rfc6455#section-5.5.2) specifies it should be sent
/// as soon as is practical.
///
/// Note that upon receiving a ping message, tungstenite cues a pong reply automatically.
/// When you call either `read_message`, `write_message` or `write_pending` next it will try to send
/// that pong out if the underlying connection can take more data. This means you should not
/// respond to ping frames manually.
///
/// You can however send pong frames manually in order to indicate a unidirectional heartbeat
/// as described in [RFC 6455](https://tools.ietf.org/html/rfc6455#section-5.5.3). Note that
/// if `read_message` returns a ping, you should call `write_pending` until it doesn't return
/// WouldBlock before passing a pong to `write_message`, otherwise the response to the
/// ping will not be sent, but rather replaced by your custom pong message.
///
/// ## Errors
/// - If the WebSocket's send queue is full, `SendQueueFull` will be returned
/// along with the passed message. Otherwise, the message is queued and Ok(()) is returned.
/// - If the connection is closed and should be dropped, this will return [Error::ConnectionClosed].
/// - If you try again after [Error::ConnectionClosed] was returned either from here or from `read_message`,
/// [Error::AlreadyClosed] will be returned. This indicates a program error on your part.
/// - [Error::Io] is returned if the underlying connection returns an error
/// (consider these fatal except for WouldBlock).
/// - [Error::Capacity] if your message size is bigger than the configured max message size.
pub fn write_message(&mut self, message: Message) -> Result<()> {
self.context.write_message(&mut self.socket, message)
}
/// Flush the pending send queue.
pub fn write_pending(&mut self) -> Result<()> {
self.context.write_pending(&mut self.socket)
}
/// Close the connection.
///
/// This function guarantees that the close frame will be queued.
/// There is no need to call it again. Calling this function is
/// the same as calling `write_message(Message::Close(..))`.
///
/// After queuing the close frame you should continue calling `read_message` or
/// `write_pending` to drive the close handshake to completion.
///
/// The websocket RFC defines that the underlying connection should be closed
/// by the server. Tungstenite takes care of this asymmetry for you.
///
/// When the close handshake is finished (we have both sent and received
/// a close message), `read_message` or `write_pending` will return
/// [Error::ConnectionClosed] if this endpoint is the server.
///
/// If this endpoint is a client, [Error::ConnectionClosed] will only be
/// returned after the server has closed the underlying connection.
///
/// It is thus safe to drop the underlying connection as soon as [Error::ConnectionClosed]
/// is returned from `read_message` or `write_pending`.
pub fn close(&mut self, code: Option<CloseFrame>) -> Result<()> {
self.context.close(&mut self.socket, code)
}
}
/// A context for managing WebSocket stream.
#[derive(Debug)]
pub struct WebSocketContext {
/// Server or client?
role: Role,
/// encoder/decoder of frame.
frame: FrameCodec,
/// The state of processing, either "active" or "closing".
state: WebSocketState,
/// Receive: an incomplete message being processed.
incomplete: Option<IncompleteMessage>,
/// Send: a data send queue.
send_queue: VecDeque<Frame>,
/// Send: an OOB pong message.
pong: Option<Frame>,
/// The configuration for the websocket session.
config: WebSocketConfig,
}
impl WebSocketContext {
/// Create a WebSocket context that manages a post-handshake stream.
pub fn new(role: Role, config: Option<WebSocketConfig>) -> Self {
WebSocketContext {
role,
frame: FrameCodec::new(),
state: WebSocketState::Active,
incomplete: None,
send_queue: VecDeque::new(),
pong: None,
config: config.unwrap_or_default(),
}
}
/// Create a WebSocket context that manages an post-handshake stream.
pub fn from_partially_read(part: Vec<u8>, role: Role, config: Option<WebSocketConfig>) -> Self {
WebSocketContext {
frame: FrameCodec::from_partially_read(part),
..WebSocketContext::new(role, config)
}
}
/// Change the configuration.
pub fn set_config(&mut self, set_func: impl FnOnce(&mut WebSocketConfig)) {
set_func(&mut self.config)
}
/// Read the configuration.
pub fn get_config(&self) -> &WebSocketConfig {
&self.config
}
/// Check if it is possible to read messages.
///
/// Reading is impossible after receiving `Message::Close`. It is still possible after
/// sending close frame since the peer still may send some data before confirming close.
pub fn can_read(&self) -> bool {
self.state.can_read()
}
/// Check if it is possible to write messages.
///
/// Writing gets impossible immediately after sending or receiving `Message::Close`.
pub fn can_write(&self) -> bool {
self.state.is_active()
}
/// Read a message from the provided stream, if possible.
///
/// This function sends pong and close responses automatically.
/// However, it never blocks on write.
pub fn read_message<Stream>(&mut self, stream: &mut Stream) -> Result<Message>
where
Stream: Read + Write,
{
// Do not read from already closed connections.
self.state.check_active()?;
loop {
// Since we may get ping or close, we need to reply to the messages even during read.
// Thus we call write_pending() but ignore its blocking.
self.write_pending(stream).no_block()?;
// If we get here, either write blocks or we have nothing to write.
// Thus if read blocks, just let it return WouldBlock.
if let Some(message) = self.read_message_frame(stream)? {
trace!("Received message {}", message);
return Ok(message);
}
}
}
/// Send a message to the provided stream, if possible.
///
/// WebSocket will buffer a configurable number of messages at a time, except to reply to Ping
/// and Close requests. If the WebSocket's send queue is full, `SendQueueFull` will be returned
/// along with the passed message. Otherwise, the message is queued and Ok(()) is returned.
///
/// Note that only the last pong frame is stored to be sent, and only the
/// most recent pong frame is sent if multiple pong frames are queued.
pub fn write_message<Stream>(&mut self, stream: &mut Stream, message: Message) -> Result<()>
where
Stream: Read + Write,
{
// When terminated, return AlreadyClosed.
self.state.check_active()?;
// Do not write after sending a close frame.
if !self.state.is_active() {
return Err(Error::Protocol(ProtocolError::SendAfterClosing));
}
if let Some(max_send_queue) = self.config.max_send_queue {
if self.send_queue.len() >= max_send_queue {
// Try to make some room for the new message.
// Do not return here if write would block, ignore WouldBlock silently
// since we must queue the message anyway.
self.write_pending(stream).no_block()?;
}
if self.send_queue.len() >= max_send_queue {
return Err(Error::SendQueueFull(message));
}
}
let frame = match message {
Message::Text(data) => Frame::message(data.into(), OpCode::Data(OpData::Text), true),
Message::Binary(data) => Frame::message(data, OpCode::Data(OpData::Binary), true),
Message::Ping(data) => Frame::ping(data),
Message::Pong(data) => {
self.pong = Some(Frame::pong(data));
return self.write_pending(stream);
}
Message::Close(code) => return self.close(stream, code),
Message::Frame(f) => f,
};
self.send_queue.push_back(frame);
self.write_pending(stream)
}
/// Flush the pending send queue.
pub fn write_pending<Stream>(&mut self, stream: &mut Stream) -> Result<()>
where
Stream: Read + Write,
{
// First, make sure we have no pending frame sending.
self.frame.write_pending(stream)?;
// Upon receipt of a Ping frame, an endpoint MUST send a Pong frame in
// response, unless it already received a Close frame. It SHOULD
// respond with Pong frame as soon as is practical. (RFC 6455)
if let Some(pong) = self.pong.take() {
trace!("Sending pong reply");
self.send_one_frame(stream, pong)?;
}
// If we have any unsent frames, send them.
trace!("Frames still in queue: {}", self.send_queue.len());
while let Some(data) = self.send_queue.pop_front() {
self.send_one_frame(stream, data)?;
}
// If we get to this point, the send queue is empty and the underlying socket is still
// willing to take more data.
// If we're closing and there is nothing to send anymore, we should close the connection.
if self.role == Role::Server && !self.state.can_read() {
// The underlying TCP connection, in most normal cases, SHOULD be closed
// first by the server, so that it holds the TIME_WAIT state and not the
// client (as this would prevent it from re-opening the connection for 2
// maximum segment lifetimes (2MSL), while there is no corresponding
// server impact as a TIME_WAIT connection is immediately reopened upon
// a new SYN with a higher seq number). (RFC 6455)
self.state = WebSocketState::Terminated;
Err(Error::ConnectionClosed)
} else {
Ok(())
}
}
/// Close the connection.
///
/// This function guarantees that the close frame will be queued.
/// There is no need to call it again. Calling this function is
/// the same as calling `write(Message::Close(..))`.
pub fn close<Stream>(&mut self, stream: &mut Stream, code: Option<CloseFrame>) -> Result<()>
where
Stream: Read + Write,
{
if let WebSocketState::Active = self.state {
self.state = WebSocketState::ClosedByUs;
let frame = Frame::close(code);
self.send_queue.push_back(frame);
} else {
// Already closed, nothing to do.
}
self.write_pending(stream)
}
/// Try to decode one message frame. May return None.
fn read_message_frame<Stream>(&mut self, stream: &mut Stream) -> Result<Option<Message>>
where
Stream: Read + Write,
{
if let Some(mut frame) = self
.frame
.read_frame(stream, self.config.max_frame_size)
.check_connection_reset(self.state)?
{
if !self.state.can_read() {
return Err(Error::Protocol(ProtocolError::ReceivedAfterClosing));
}
// MUST be 0 unless an extension is negotiated that defines meanings
// for non-zero values. If a nonzero value is received and none of
// the negotiated extensions defines the meaning of such a nonzero
// value, the receiving endpoint MUST _Fail the WebSocket
// Connection_.
{
let hdr = frame.header();
if hdr.rsv1 || hdr.rsv2 || hdr.rsv3 {
return Err(Error::Protocol(ProtocolError::NonZeroReservedBits));
}
}
match self.role {
Role::Server => {
if frame.is_masked() {
// A server MUST remove masking for data frames received from a client
// as described in Section 5.3. (RFC 6455)
frame.apply_mask()
} else if !self.config.accept_unmasked_frames {
// The server MUST close the connection upon receiving a
// frame that is not masked. (RFC 6455)
// The only exception here is if the user explicitly accepts given
// stream by setting WebSocketConfig.accept_unmasked_frames to true
return Err(Error::Protocol(ProtocolError::UnmaskedFrameFromClient));
}
}
Role::Client => {
if frame.is_masked() {
// A client MUST close a connection if it detects a masked frame. (RFC 6455)
return Err(Error::Protocol(ProtocolError::MaskedFrameFromServer));
}
}
}
match frame.header().opcode {
OpCode::Control(ctl) => {
match ctl {
// All control frames MUST have a payload length of 125 bytes or less
// and MUST NOT be fragmented. (RFC 6455)
_ if !frame.header().is_final => {
Err(Error::Protocol(ProtocolError::FragmentedControlFrame))
}
_ if frame.payload().len() > 125 => {
Err(Error::Protocol(ProtocolError::ControlFrameTooBig))
}
OpCtl::Close => Ok(self.do_close(frame.into_close()?).map(Message::Close)),
OpCtl::Reserved(i) => {
Err(Error::Protocol(ProtocolError::UnknownControlFrameType(i)))
}
OpCtl::Ping => {
let data = frame.into_data();
// No ping processing after we sent a close frame.
if self.state.is_active() {
self.pong = Some(Frame::pong(data.clone()));
}
Ok(Some(Message::Ping(data)))
}
OpCtl::Pong => Ok(Some(Message::Pong(frame.into_data()))),
}
}
OpCode::Data(data) => {
let fin = frame.header().is_final;
match data {
OpData::Continue => {
if let Some(ref mut msg) = self.incomplete {
msg.extend(frame.into_data(), self.config.max_message_size)?;
} else {
return Err(Error::Protocol(
ProtocolError::UnexpectedContinueFrame,
));
}
if fin {
Ok(Some(self.incomplete.take().unwrap().complete()?))
} else {
Ok(None)
}
}
c if self.incomplete.is_some() => {
Err(Error::Protocol(ProtocolError::ExpectedFragment(c)))
}
OpData::Text | OpData::Binary => {
let msg = {
let message_type = match data {
OpData::Text => IncompleteMessageType::Text,
OpData::Binary => IncompleteMessageType::Binary,
_ => panic!("Bug: message is not text nor binary"),
};
let mut m = IncompleteMessage::new(message_type);
m.extend(frame.into_data(), self.config.max_message_size)?;
m
};
if fin {
Ok(Some(msg.complete()?))
} else {
self.incomplete = Some(msg);
Ok(None)
}
}
OpData::Reserved(i) => {
Err(Error::Protocol(ProtocolError::UnknownDataFrameType(i)))
}
}
}
} // match opcode
} else {
// Connection closed by peer
match replace(&mut self.state, WebSocketState::Terminated) {
WebSocketState::ClosedByPeer | WebSocketState::CloseAcknowledged => {
Err(Error::ConnectionClosed)
}
_ => Err(Error::Protocol(ProtocolError::ResetWithoutClosingHandshake)),
}
}
}
/// Received a close frame. Tells if we need to return a close frame to the user.
#[allow(clippy::option_option)]
fn do_close<'t>(&mut self, close: Option<CloseFrame<'t>>) -> Option<Option<CloseFrame<'t>>> {
debug!("Received close frame: {:?}", close);
match self.state {
WebSocketState::Active => {
self.state = WebSocketState::ClosedByPeer;
let close = close.map(|frame| {
if !frame.code.is_allowed() {
CloseFrame {
code: CloseCode::Protocol,
reason: "Protocol violation".into(),
}
} else {
frame
}
});
let reply = Frame::close(close.clone());
debug!("Replying to close with {:?}", reply);
self.send_queue.push_back(reply);
Some(close)
}
WebSocketState::ClosedByPeer | WebSocketState::CloseAcknowledged => {
// It is already closed, just ignore.
None
}
WebSocketState::ClosedByUs => {
// We received a reply.
self.state = WebSocketState::CloseAcknowledged;
Some(close)
}
WebSocketState::Terminated => unreachable!(),
}
}
/// Send a single pending frame.
fn send_one_frame<Stream>(&mut self, stream: &mut Stream, mut frame: Frame) -> Result<()>
where
Stream: Read + Write,
{
match self.role {
Role::Server => {}
Role::Client => {
// 5. If the data is being sent by the client, the frame(s) MUST be
// masked as defined in Section 5.3. (RFC 6455)
frame.set_random_mask();
}
}
trace!("Sending frame: {:?}", frame);
self.frame.write_frame(stream, frame).check_connection_reset(self.state)
}
}
/// The current connection state.
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
enum WebSocketState {
/// The connection is active.
Active,
/// We initiated a close handshake.
ClosedByUs,
/// The peer initiated a close handshake.
ClosedByPeer,
/// The peer replied to our close handshake.
CloseAcknowledged,
/// The connection does not exist anymore.
Terminated,
}
impl WebSocketState {
/// Tell if we're allowed to process normal messages.
fn is_active(self) -> bool {
matches!(self, WebSocketState::Active)
}
/// Tell if we should process incoming data. Note that if we send a close frame
/// but the remote hasn't confirmed, they might have sent data before they receive our
/// close frame, so we should still pass those to client code, hence ClosedByUs is valid.
fn can_read(self) -> bool {
matches!(self, WebSocketState::Active | WebSocketState::ClosedByUs)
}
/// Check if the state is active, return error if not.
fn check_active(self) -> Result<()> {
match self {
WebSocketState::Terminated => Err(Error::AlreadyClosed),
_ => Ok(()),
}
}
}
/// Translate "Connection reset by peer" into `ConnectionClosed` if appropriate.
trait CheckConnectionReset {
fn check_connection_reset(self, state: WebSocketState) -> Self;
}
impl<T> CheckConnectionReset for Result<T> {
fn check_connection_reset(self, state: WebSocketState) -> Self {
match self {
Err(Error::Io(io_error)) => Err({
if !state.can_read() && io_error.kind() == IoErrorKind::ConnectionReset {
Error::ConnectionClosed
} else {
Error::Io(io_error)
}
}),
x => x,
}
}
}
#[cfg(test)]
mod tests {
use super::{Message, Role, WebSocket, WebSocketConfig};
use crate::error::{CapacityError, Error};
use std::{io, io::Cursor};
struct WriteMoc<Stream>(Stream);
impl<Stream> io::Write for WriteMoc<Stream> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
Ok(buf.len())
}
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
impl<Stream: io::Read> io::Read for WriteMoc<Stream> {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
self.0.read(buf)
}
}
struct WouldBlockStreamMoc;
impl io::Write for WouldBlockStreamMoc {
fn write(&mut self, _: &[u8]) -> io::Result<usize> {
Err(io::Error::new(io::ErrorKind::WouldBlock, "would block"))
}
fn flush(&mut self) -> io::Result<()> {
Err(io::Error::new(io::ErrorKind::WouldBlock, "would block"))
}
}
impl io::Read for WouldBlockStreamMoc {
fn read(&mut self, _: &mut [u8]) -> io::Result<usize> {
Err(io::Error::new(io::ErrorKind::WouldBlock, "would block"))
}
}
#[test]
fn queue_logic() {
// Create a socket with the queue size of 1.
let mut socket = WebSocket::from_raw_socket(
WouldBlockStreamMoc,
Role::Client,
Some(WebSocketConfig { max_send_queue: Some(1), ..Default::default() }),
);
// Test message that we're going to send.
let message = Message::Binary(vec![0xFF; 1024]);
// Helper to check the error.
let assert_would_block = |error| {
if let Error::Io(io_error) = error {
assert_eq!(io_error.kind(), io::ErrorKind::WouldBlock);
} else {
panic!("Expected WouldBlock error");
}
};
// The first attempt of writing must not fail, since the queue is empty at start.
// But since the underlying mock object always returns `WouldBlock`, so is the result.
assert_would_block(dbg!(socket.write_message(message.clone()).unwrap_err()));
// Any subsequent attempts must return an error telling that the queue is full.
for _i in 0..100 {
assert!(matches!(
socket.write_message(message.clone()).unwrap_err(),
Error::SendQueueFull(..)
));
}
// The size of the output buffer must not be bigger than the size of that message
// that we managed to write to the output buffer at first. Since we could not make
// any progress (because of the logic of the moc buffer), the size remains unchanged.
if socket.context.frame.output_buffer_len() > message.len() {
panic!("Too many frames in the queue");
}
}
#[test]
fn receive_messages() {
let incoming = Cursor::new(vec![
0x89, 0x02, 0x01, 0x02, 0x8a, 0x01, 0x03, 0x01, 0x07, 0x48, 0x65, 0x6c, 0x6c, 0x6f,
0x2c, 0x20, 0x80, 0x06, 0x57, 0x6f, 0x72, 0x6c, 0x64, 0x21, 0x82, 0x03, 0x01, 0x02,
0x03,
]);
let mut socket = WebSocket::from_raw_socket(WriteMoc(incoming), Role::Client, None);
assert_eq!(socket.read_message().unwrap(), Message::Ping(vec![1, 2]));
assert_eq!(socket.read_message().unwrap(), Message::Pong(vec![3]));
assert_eq!(socket.read_message().unwrap(), Message::Text("Hello, World!".into()));
assert_eq!(socket.read_message().unwrap(), Message::Binary(vec![0x01, 0x02, 0x03]));
}
#[test]
fn size_limiting_text_fragmented() {
let incoming = Cursor::new(vec![
0x01, 0x07, 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x2c, 0x20, 0x80, 0x06, 0x57, 0x6f, 0x72,
0x6c, 0x64, 0x21,
]);
let limit = WebSocketConfig { max_message_size: Some(10), ..WebSocketConfig::default() };
let mut socket = WebSocket::from_raw_socket(WriteMoc(incoming), Role::Client, Some(limit));
assert!(matches!(
socket.read_message(),
Err(Error::Capacity(CapacityError::MessageTooLong { size: 13, max_size: 10 }))
));
}
#[test]
fn size_limiting_binary() {
let incoming = Cursor::new(vec![0x82, 0x03, 0x01, 0x02, 0x03]);
let limit = WebSocketConfig { max_message_size: Some(2), ..WebSocketConfig::default() };
let mut socket = WebSocket::from_raw_socket(WriteMoc(incoming), Role::Client, Some(limit));
assert!(matches!(
socket.read_message(),
Err(Error::Capacity(CapacityError::MessageTooLong { size: 3, max_size: 2 }))
));
}
}
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