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+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![warn(clippy::pedantic)]
+
+/*!
+
+# The HTTP/3 protocol
+
+This crate implements [RFC9114](https://datatracker.ietf.org/doc/html/rfc9114).
+
+The implementation depends on:
+ - [neqo-transport](../neqo_transport/index.html) --- implements the QUIC protocol
+   ([RFC9000](https://www.rfc-editor.org/info/rfc9000)) and
+ - [neqo-qpack](../neqo_qpack/index.html) --- implements QPACK
+   ([RFC9204](https://www.rfc-editor.org/info/rfc9204));
+
+## Features
+
+Both client and server-side HTTP/3 protocols are implemented, although the server-side
+implementation is not meant to be used in production and its only purpose is to facilitate testing
+of the client-side code.
+
+__`WebTransport`__
+([draft version 2](https://datatracker.ietf.org/doc/html/draft-vvv-webtransport-http3-02)) is
+supported and can be enabled using [`Http3Parameters`](struct.Http3Parameters.html).
+
+## Interaction with an application
+
+### Driving HTTP/3  session
+
+The crate does not create an OS level UDP socket, it produces, i.e. encodes, data that should be
+sent as a payload in a UDP packet and consumes data received on the UDP socket. For example,
+[`std::net::UdpSocket`](std::net::UdpSocket) or [`mio::net::UdpSocket`](https://crates.io/crates/mio)
+could be used for creating UDP sockets.
+
+The application is responsible for creating a socket, polling the socket, and sending and receiving
+data from the socket.
+
+In addition to receiving data HTTP/3 session’s actions may be triggered when a certain amount of
+time passes, e.g. after a certain amount of time data may be considered lost and should be
+retransmitted, packet pacing requires a timer, etc. The implementation does not use timers, but
+instead informs the application when processing needs to be triggered.
+
+
+The core functions for driving HTTP/3 sessions are:
+ - __On the client-side__ :
+   - [`process_output`](struct.Http3Client.html#method.process_output) used for producing UDP
+payload. If a payload is not produced this function returns a callback time, e.g. the time when
+[`process_output`](struct.Http3Client.html#method.process_output) should be called again.
+   - [`process_input`](struct.Http3Client.html#method.process_input)  used consuming UDP payload.
+   - [`process`](struct.Http3Client.html#method.process) combines the 2 functions into one, i.e. it
+consumes UDP payload if available and produces some UDP payload to be sent or returns a
+callback time.
+- __On the server-side__ only [`process`](struct.Http3Server.html#method.process) is
+available.
+
+An example interaction with a socket:
+
+```ignore
+let socket = match UdpSocket::bind(local_addr) {
+    Err(e) => {
+        eprintln!("Unable to bind UDP socket: {}", e);
+    }
+    Ok(s) => s,
+};
+let mut client = Http3Client::new(...);
+
+...
+
+// process_output can return 3 values, data to be sent, time duration when process_output should
+// be called, and None when Http3Client is done.
+match client.process_output(Instant::now()) {
+    Output::Datagram(dgram) => {
+        // Send dgram on a socket.
+        socket.send_to(&dgram[..], dgram.destination())
+
+    }
+    Output::Callback(duration) => {
+        // the client is idle for “duration”, set read timeout on the socket to this value and
+        // poll the socket for reading in the meantime.
+        socket.set_read_timeout(Some(duration)).unwrap();
+    }
+    Output::None => {
+        // client is done.
+    }
+};
+
+...
+
+// Reading new data coming for the network.
+match socket.recv_from(&mut buf[..]) {
+     Ok((sz, remote)) => {
+        let d = Datagram::new(remote, *local_addr, &buf[..sz]);
+        client.process_input(d, Instant::now());
+    }
+    Err(err) => {
+         eprintln!("UDP error: {}", err);
+    }
+}
+ ```
+
+### HTTP/3 session events
+
+[`Http3Client`](struct.Http3Client.html) and [`Http3Server`](struct.Http3Server.html) produce
+events that can be obtain by calling
+[`next_event`](neqo_common/event/trait.Provider.html#tymethod.next_event). The events are of type
+[`Http3ClientEvent`](enum.Http3ClientEvent.html) and
+[`Http3ServerEvent`](enum.Http3ServerEvent.html) respectively. They are informing the application
+when the connection changes state, when new data is received on a stream, etc.
+
+```ignore
+...
+
+while let Some(event) = client.next_event() {
+    match event {
+        Http3ClientEvent::DataReadable { stream_id } => {
+            println!("New data available on stream {}", stream_id);
+        }
+        Http3ClientEvent::StateChange(Http3State::Connected) => {
+            println!("Http3 session is in state Connected now");
+        }
+        _ => {
+            println!("Unhandled event {:?}", event);
+        }
+    }
+}
+```
+
+
+
+*/
+
+mod buffered_send_stream;
+mod client_events;
+mod conn_params;
+mod connection;
+mod connection_client;
+mod connection_server;
+mod control_stream_local;
+mod control_stream_remote;
+pub mod features;
+mod frames;
+mod headers_checks;
+mod priority;
+mod push_controller;
+mod qlog;
+mod qpack_decoder_receiver;
+mod qpack_encoder_receiver;
+mod recv_message;
+mod request_target;
+mod send_message;
+mod server;
+mod server_connection_events;
+mod server_events;
+mod settings;
+mod stream_type_reader;
+
+use neqo_qpack::Error as QpackError;
+use neqo_transport::{AppError, Connection, Error as TransportError};
+pub use neqo_transport::{Output, StreamId};
+use std::fmt::Debug;
+
+use crate::priority::PriorityHandler;
+use buffered_send_stream::BufferedStream;
+pub use client_events::{Http3ClientEvent, WebTransportEvent};
+pub use conn_params::Http3Parameters;
+pub use connection::{Http3State, WebTransportSessionAcceptAction};
+pub use connection_client::Http3Client;
+use features::extended_connect::WebTransportSession;
+use frames::HFrame;
+pub use neqo_common::Header;
+use neqo_common::MessageType;
+pub use priority::Priority;
+pub use server::Http3Server;
+pub use server_events::{
+    Http3OrWebTransportStream, Http3ServerEvent, WebTransportRequest, WebTransportServerEvent,
+};
+use std::any::Any;
+use std::cell::RefCell;
+use std::rc::Rc;
+use stream_type_reader::NewStreamType;
+
+type Res<T> = Result<T, Error>;
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum Error {
+    HttpNoError,
+    HttpGeneralProtocol,
+    HttpGeneralProtocolStream, //this is the same as the above but it should only close a stream not a connection.
+    // When using this error, you need to provide a value that is unique, which
+    // will allow the specific error to be identified.  This will be validated in CI.
+    HttpInternal(u16),
+    HttpStreamCreation,
+    HttpClosedCriticalStream,
+    HttpFrameUnexpected,
+    HttpFrame,
+    HttpExcessiveLoad,
+    HttpId,
+    HttpSettings,
+    HttpMissingSettings,
+    HttpRequestRejected,
+    HttpRequestCancelled,
+    HttpRequestIncomplete,
+    HttpConnect,
+    HttpVersionFallback,
+    HttpMessageError,
+    QpackError(neqo_qpack::Error),
+
+    // Internal errors from here.
+    AlreadyClosed,
+    AlreadyInitialized,
+    DecodingFrame,
+    FatalError,
+    HttpGoaway,
+    Internal,
+    InvalidHeader,
+    InvalidInput,
+    InvalidRequestTarget,
+    InvalidResumptionToken,
+    InvalidState,
+    InvalidStreamId,
+    NoMoreData,
+    NotEnoughData,
+    StreamLimitError,
+    TransportError(TransportError),
+    TransportStreamDoesNotExist,
+    Unavailable,
+    Unexpected,
+}
+
+impl Error {
+    #[must_use]
+    pub fn code(&self) -> AppError {
+        match self {
+            Self::HttpNoError => 0x100,
+            Self::HttpGeneralProtocol | Self::HttpGeneralProtocolStream | Self::InvalidHeader => {
+                0x101
+            }
+            Self::HttpInternal(..) => 0x102,
+            Self::HttpStreamCreation => 0x103,
+            Self::HttpClosedCriticalStream => 0x104,
+            Self::HttpFrameUnexpected => 0x105,
+            Self::HttpFrame => 0x106,
+            Self::HttpExcessiveLoad => 0x107,
+            Self::HttpId => 0x108,
+            Self::HttpSettings => 0x109,
+            Self::HttpMissingSettings => 0x10a,
+            Self::HttpRequestRejected => 0x10b,
+            Self::HttpRequestCancelled => 0x10c,
+            Self::HttpRequestIncomplete => 0x10d,
+            Self::HttpMessageError => 0x10e,
+            Self::HttpConnect => 0x10f,
+            Self::HttpVersionFallback => 0x110,
+            Self::QpackError(e) => e.code(),
+            // These are all internal errors.
+            _ => 3,
+        }
+    }
+
+    #[must_use]
+    pub fn connection_error(&self) -> bool {
+        matches!(
+            self,
+            Self::HttpGeneralProtocol
+                | Self::HttpInternal(..)
+                | Self::HttpStreamCreation
+                | Self::HttpClosedCriticalStream
+                | Self::HttpFrameUnexpected
+                | Self::HttpFrame
+                | Self::HttpExcessiveLoad
+                | Self::HttpId
+                | Self::HttpSettings
+                | Self::HttpMissingSettings
+                | Self::QpackError(QpackError::EncoderStream | QpackError::DecoderStream)
+        )
+    }
+
+    #[must_use]
+    pub fn stream_reset_error(&self) -> bool {
+        matches!(self, Self::HttpGeneralProtocolStream | Self::InvalidHeader)
+    }
+
+    /// # Panics
+    /// On unexpected errors, in debug mode.
+    #[must_use]
+    pub fn map_stream_send_errors(err: &Error) -> Self {
+        match err {
+            Self::TransportError(
+                TransportError::InvalidStreamId | TransportError::FinalSizeError,
+            ) => Error::TransportStreamDoesNotExist,
+            Self::TransportError(TransportError::InvalidInput) => Error::InvalidInput,
+            _ => {
+                debug_assert!(false, "Unexpected error");
+                Error::TransportStreamDoesNotExist
+            }
+        }
+    }
+
+    /// # Panics
+    /// On unexpected errors, in debug mode.
+    #[must_use]
+    pub fn map_stream_create_errors(err: &TransportError) -> Self {
+        match err {
+            TransportError::ConnectionState => Error::Unavailable,
+            TransportError::StreamLimitError => Error::StreamLimitError,
+            _ => {
+                debug_assert!(false, "Unexpected error");
+                Error::TransportStreamDoesNotExist
+            }
+        }
+    }
+
+    /// # Panics
+    /// On unexpected errors, in debug mode.
+    #[must_use]
+    pub fn map_stream_recv_errors(err: &Error) -> Self {
+        match err {
+            Self::TransportError(TransportError::NoMoreData) => {
+                debug_assert!(
+                    false,
+                    "Do not call stream_recv if FIN has been previously read"
+                );
+            }
+            Self::TransportError(TransportError::InvalidStreamId) => {}
+            _ => {
+                debug_assert!(false, "Unexpected error");
+            }
+        };
+        Error::TransportStreamDoesNotExist
+    }
+
+    #[must_use]
+    pub fn map_set_resumption_errors(err: &TransportError) -> Self {
+        match err {
+            TransportError::ConnectionState => Error::InvalidState,
+            _ => Error::InvalidResumptionToken,
+        }
+    }
+
+    /// # Errors
+    ///   Any error is mapped to the indicated type.
+    /// # Panics
+    /// On internal errors, in debug mode.
+    fn map_error<R>(r: Result<R, impl Into<Self>>, err: Self) -> Result<R, Self> {
+        r.map_err(|e| {
+            debug_assert!(!matches!(e.into(), Self::HttpInternal(..)));
+            debug_assert!(!matches!(err, Self::HttpInternal(..)));
+            err
+        })
+    }
+}
+
+impl From<TransportError> for Error {
+    fn from(err: TransportError) -> Self {
+        Self::TransportError(err)
+    }
+}
+
+impl From<QpackError> for Error {
+    fn from(err: QpackError) -> Self {
+        match err {
+            QpackError::ClosedCriticalStream => Error::HttpClosedCriticalStream,
+            e => Self::QpackError(e),
+        }
+    }
+}
+
+impl From<AppError> for Error {
+    fn from(error: AppError) -> Self {
+        match error {
+            0x100 => Self::HttpNoError,
+            0x101 => Self::HttpGeneralProtocol,
+            0x103 => Self::HttpStreamCreation,
+            0x104 => Self::HttpClosedCriticalStream,
+            0x105 => Self::HttpFrameUnexpected,
+            0x106 => Self::HttpFrame,
+            0x107 => Self::HttpExcessiveLoad,
+            0x108 => Self::HttpId,
+            0x109 => Self::HttpSettings,
+            0x10a => Self::HttpMissingSettings,
+            0x10b => Self::HttpRequestRejected,
+            0x10c => Self::HttpRequestCancelled,
+            0x10d => Self::HttpRequestIncomplete,
+            0x10f => Self::HttpConnect,
+            0x110 => Self::HttpVersionFallback,
+            0x200 => Self::QpackError(QpackError::DecompressionFailed),
+            0x201 => Self::QpackError(QpackError::EncoderStream),
+            0x202 => Self::QpackError(QpackError::DecoderStream),
+            _ => Self::HttpInternal(0),
+        }
+    }
+}
+
+impl ::std::error::Error for Error {
+    fn source(&self) -> Option<&(dyn ::std::error::Error + 'static)> {
+        match self {
+            Self::TransportError(e) => Some(e),
+            Self::QpackError(e) => Some(e),
+            _ => None,
+        }
+    }
+}
+
+impl ::std::fmt::Display for Error {
+    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+        write!(f, "HTTP/3 error: {:?}", self)
+    }
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Http3StreamType {
+    Control,
+    Decoder,
+    Encoder,
+    NewStream,
+    Http,
+    Push,
+    ExtendedConnect,
+    WebTransport(StreamId),
+    Unknown,
+}
+
+#[must_use]
+#[derive(PartialEq, Eq, Debug)]
+enum ReceiveOutput {
+    NoOutput,
+    ControlFrames(Vec<HFrame>),
+    UnblockedStreams(Vec<StreamId>),
+    NewStream(NewStreamType),
+}
+
+impl Default for ReceiveOutput {
+    fn default() -> Self {
+        Self::NoOutput
+    }
+}
+
+trait Stream: Debug {
+    fn stream_type(&self) -> Http3StreamType;
+}
+
+trait RecvStream: Stream {
+    /// The stream reads data from the corresponding quic stream and returns `ReceiveOutput`.
+    /// The function also returns true as the second parameter if the stream is done and
+    /// could be forgotten, i.e. removed from all records.
+    /// # Errors
+    /// An error may happen while reading a stream, e.g. early close, protocol error, etc.
+    fn receive(&mut self, conn: &mut Connection) -> Res<(ReceiveOutput, bool)>;
+    /// # Errors
+    /// An error may happen while reading a stream, e.g. early close, etc.
+    fn reset(&mut self, close_type: CloseType) -> Res<()>;
+    /// The function allows an app to read directly from the quic stream. The function
+    /// returns the number of bytes written into `buf` and true/false if the stream is
+    /// completely done and can be forgotten, i.e. removed from all records.
+    /// # Errors
+    /// An error may happen while reading a stream, e.g. early close, protocol error, etc.
+    fn read_data(&mut self, _conn: &mut Connection, _buf: &mut [u8]) -> Res<(usize, bool)> {
+        Err(Error::InvalidStreamId)
+    }
+
+    fn http_stream(&mut self) -> Option<&mut dyn HttpRecvStream> {
+        None
+    }
+
+    fn webtransport(&self) -> Option<Rc<RefCell<WebTransportSession>>> {
+        None
+    }
+}
+
+trait HttpRecvStream: RecvStream {
+    /// This function is similar to the receive function and has the same output, i.e.
+    /// a `ReceiveOutput` enum and bool. The bool is true if the stream is completely done
+    /// and can be forgotten, i.e. removed from all records.
+    /// # Errors
+    /// An error may happen while reading a stream, e.g. early close, protocol error, etc.
+    fn header_unblocked(&mut self, conn: &mut Connection) -> Res<(ReceiveOutput, bool)>;
+
+    fn maybe_update_priority(&mut self, priority: Priority) -> bool;
+    fn priority_update_frame(&mut self) -> Option<HFrame>;
+    fn priority_update_sent(&mut self);
+
+    fn set_new_listener(&mut self, _conn_events: Box<dyn HttpRecvStreamEvents>) {}
+    fn extended_connect_wait_for_response(&self) -> bool {
+        false
+    }
+
+    fn any(&self) -> &dyn Any;
+}
+
+#[derive(Debug, PartialEq, Eq, Copy, Clone)]
+pub struct Http3StreamInfo {
+    stream_id: StreamId,
+    stream_type: Http3StreamType,
+}
+
+impl Http3StreamInfo {
+    #[must_use]
+    pub fn new(stream_id: StreamId, stream_type: Http3StreamType) -> Self {
+        Self {
+            stream_id,
+            stream_type,
+        }
+    }
+
+    #[must_use]
+    pub fn stream_id(&self) -> StreamId {
+        self.stream_id
+    }
+
+    #[must_use]
+    pub fn session_id(&self) -> Option<StreamId> {
+        if let Http3StreamType::WebTransport(session) = self.stream_type {
+            Some(session)
+        } else {
+            None
+        }
+    }
+
+    #[must_use]
+    pub fn is_http(&self) -> bool {
+        self.stream_type == Http3StreamType::Http
+    }
+}
+
+trait RecvStreamEvents: Debug {
+    fn data_readable(&self, _stream_info: Http3StreamInfo) {}
+    fn recv_closed(&self, _stream_info: Http3StreamInfo, _close_type: CloseType) {}
+}
+
+trait HttpRecvStreamEvents: RecvStreamEvents {
+    fn header_ready(
+        &self,
+        stream_info: Http3StreamInfo,
+        headers: Vec<Header>,
+        interim: bool,
+        fin: bool,
+    );
+    fn extended_connect_new_session(&self, _stream_id: StreamId, _headers: Vec<Header>) {}
+}
+
+trait SendStream: Stream {
+    /// # Errors
+    /// Error my occure during sending data, e.g. protocol error, etc.
+    fn send(&mut self, conn: &mut Connection) -> Res<()>;
+    fn has_data_to_send(&self) -> bool;
+    fn stream_writable(&self);
+    fn done(&self) -> bool;
+    /// # Errors
+    /// Error my occure during sending data, e.g. protocol error, etc.
+    fn send_data(&mut self, _conn: &mut Connection, _buf: &[u8]) -> Res<usize>;
+
+    /// # Errors
+    /// It may happen that the transport stream is already close. This is unlikely.
+    fn close(&mut self, conn: &mut Connection) -> Res<()>;
+    /// # Errors
+    /// It may happen that the transport stream is already close. This is unlikely.
+    fn close_with_message(
+        &mut self,
+        _conn: &mut Connection,
+        _error: u32,
+        _message: &str,
+    ) -> Res<()> {
+        Err(Error::InvalidStreamId)
+    }
+    /// This function is called when sending side is closed abruptly by the peer or
+    /// the application.
+    fn handle_stop_sending(&mut self, close_type: CloseType);
+    fn http_stream(&mut self) -> Option<&mut dyn HttpSendStream> {
+        None
+    }
+
+    /// # Errors
+    /// It may happen that the transport stream is already close. This is unlikely.
+    fn send_data_atomic(&mut self, _conn: &mut Connection, _buf: &[u8]) -> Res<()> {
+        Err(Error::InvalidStreamId)
+    }
+}
+
+trait HttpSendStream: SendStream {
+    /// This function is used to supply headers to a http message. The
+    /// function is used for request headers, response headers, 1xx response and
+    /// trailers.
+    /// # Errors
+    /// This can also return an error if the underlying stream is closed.
+    fn send_headers(&mut self, headers: &[Header], conn: &mut Connection) -> Res<()>;
+    fn set_new_listener(&mut self, _conn_events: Box<dyn SendStreamEvents>) {}
+    fn any(&self) -> &dyn Any;
+}
+
+trait SendStreamEvents: Debug {
+    fn send_closed(&self, _stream_info: Http3StreamInfo, _close_type: CloseType) {}
+    fn data_writable(&self, _stream_info: Http3StreamInfo) {}
+}
+
+/// This enum is used to mark a different type of closing a stream:
+///   `ResetApp` - the application has closed the stream.
+///   `ResetRemote` - the stream was closed by the peer.
+///   `LocalError` - There was a stream error on the stream. The stream errors are errors
+///                  that do not close the complete connection, e.g. unallowed headers.
+///   `Done` - the stream was closed without an error.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+enum CloseType {
+    ResetApp(AppError),
+    ResetRemote(AppError),
+    LocalError(AppError),
+    Done,
+}
+
+impl CloseType {
+    #[must_use]
+    pub fn error(&self) -> Option<AppError> {
+        match self {
+            Self::ResetApp(error) | Self::ResetRemote(error) | Self::LocalError(error) => {
+                Some(*error)
+            }
+            Self::Done => None,
+        }
+    }
+
+    #[must_use]
+    pub fn locally_initiated(&self) -> bool {
+        matches!(self, CloseType::ResetApp(_))
+    }
+}