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use crate::{
after_send::{AfterSend, SendStatus},
copy,
http_config::DEFAULT_CONFIG,
received_body::ReceivedBodyState,
util::encoding,
Body, BufWriter, Buffer, ConnectionStatus, Error, HeaderName, HeaderValue, Headers, HttpConfig,
KnownHeaderName::{Connection, ContentLength, Date, Expect, Host, Server, TransferEncoding},
Method, ReceivedBody, Result, StateSet, Status, Stopper, Upgrade, Version,
};
use encoding_rs::Encoding;
use futures_lite::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt};
use httparse::{Request, EMPTY_HEADER};
use memchr::memmem::Finder;
use std::{
convert::TryInto,
fmt::{self, Debug, Formatter},
future::Future,
net::IpAddr,
str::FromStr,
time::{Instant, SystemTime},
};
/// Default Server header
pub const SERVER: &str = concat!("trillium/", env!("CARGO_PKG_VERSION"));
/** A http connection
Unlike in other rust http implementations, this struct represents both
the request and the response, and holds the transport over which the
response will be sent.
*/
pub struct Conn<Transport> {
pub(crate) request_headers: Headers,
pub(crate) response_headers: Headers,
pub(crate) path: String,
pub(crate) method: Method,
pub(crate) status: Option<Status>,
pub(crate) version: Version,
pub(crate) state: StateSet,
pub(crate) response_body: Option<Body>,
pub(crate) transport: Transport,
pub(crate) buffer: Buffer,
pub(crate) request_body_state: ReceivedBodyState,
pub(crate) secure: bool,
pub(crate) stopper: Stopper,
pub(crate) after_send: AfterSend,
pub(crate) start_time: Instant,
pub(crate) peer_ip: Option<IpAddr>,
pub(crate) http_config: HttpConfig,
}
impl<Transport> Debug for Conn<Transport> {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
f.debug_struct("Conn")
.field("http_config", &self.http_config)
.field("request_headers", &self.request_headers)
.field("response_headers", &self.response_headers)
.field("path", &self.path)
.field("method", &self.method)
.field("status", &self.status)
.field("version", &self.version)
.field("state", &self.state)
.field("response_body", &self.response_body)
.field("transport", &"..")
.field("buffer", &"..")
.field("request_body_state", &self.request_body_state)
.field("secure", &self.secure)
.field("stopper", &self.stopper)
.field("after_send", &"..")
.field("start_time", &self.start_time)
.field("peer_ip", &self.peer_ip)
.finish()
}
}
impl<Transport> Conn<Transport>
where
Transport: AsyncRead + AsyncWrite + Unpin + Send + Sync + 'static,
{
/// read any number of new `Conn`s from the transport and call the
/// provided handler function until either the connection is closed or
/// an upgrade is requested. A return value of Ok(None) indicates a
/// closed connection, while a return value of Ok(Some(upgrade))
/// represents an upgrade.
///
/// Provides a default [`HttpConfig`]
///
/// See the documentation for [`Conn`] for a full example.
///
/// # Errors
///
/// This will return an error variant if:
///
/// * there is an io error when reading from the underlying transport
/// * headers are too long
/// * we are unable to parse some aspect of the request
/// * the request is an unsupported http version
/// * we cannot make sense of the headers, such as if there is a
/// `content-length` header as well as a `transfer-encoding: chunked`
/// header.
pub async fn map<F, Fut>(
transport: Transport,
stopper: Stopper,
handler: F,
) -> Result<Option<Upgrade<Transport>>>
where
F: Fn(Conn<Transport>) -> Fut,
Fut: Future<Output = Conn<Transport>> + Send,
{
Self::map_with_config(DEFAULT_CONFIG, transport, stopper, handler).await
}
/// read any number of new `Conn`s from the transport and call the
/// provided handler function until either the connection is closed or
/// an upgrade is requested. A return value of Ok(None) indicates a
/// closed connection, while a return value of Ok(Some(upgrade))
/// represents an upgrade.
///
/// See the documentation for [`Conn`] for a full example.
///
/// # Errors
///
/// This will return an error variant if:
///
/// * there is an io error when reading from the underlying transport
/// * headers are too long
/// * we are unable to parse some aspect of the request
/// * the request is an unsupported http version
/// * we cannot make sense of the headers, such as if there is a
/// `content-length` header as well as a `transfer-encoding: chunked`
/// header.
pub async fn map_with_config<F, Fut>(
http_config: HttpConfig,
transport: Transport,
stopper: Stopper,
handler: F,
) -> Result<Option<Upgrade<Transport>>>
where
F: Fn(Conn<Transport>) -> Fut,
Fut: Future<Output = Conn<Transport>> + Send,
{
let mut conn = Conn::new_with_config(
http_config,
transport,
Vec::with_capacity(http_config.request_buffer_initial_len).into(),
stopper,
)
.await?;
loop {
conn = match handler(conn).await.send().await? {
ConnectionStatus::Upgrade(upgrade) => return Ok(Some(upgrade)),
ConnectionStatus::Close => return Ok(None),
ConnectionStatus::Conn(next) => next,
}
}
}
async fn send(mut self) -> Result<ConnectionStatus<Transport>> {
let mut output_buffer = Vec::with_capacity(self.http_config.response_buffer_len);
self.write_headers(&mut output_buffer)?;
let mut bufwriter = BufWriter::new_with_buffer(output_buffer, &mut self.transport);
if self.method != Method::Head
&& !matches!(self.status, Some(Status::NotModified | Status::NoContent))
{
if let Some(body) = self.response_body.take() {
copy(body, &mut bufwriter, self.http_config.copy_loops_per_yield).await?;
}
}
bufwriter.flush().await?;
self.after_send.call(true.into());
self.finish().await
}
/// returns a read-only reference to the [state
/// typemap](StateSet) for this conn
///
/// stability note: this is not unlikely to be removed at some
/// point, as this may end up being more of a trillium concern
/// than a `trillium_http` concern
pub fn state(&self) -> &StateSet {
&self.state
}
/// returns a mutable reference to the [state
/// typemap](StateSet) for this conn
///
/// stability note: this is not unlikely to be removed at some
/// point, as this may end up being more of a trillium concern
/// than a `trillium_http` concern
pub fn state_mut(&mut self) -> &mut StateSet {
&mut self.state
}
/// returns a reference to the request headers
pub fn request_headers(&self) -> &Headers {
&self.request_headers
}
/// returns a mutable reference to the response [headers](Headers)
pub fn request_headers_mut(&mut self) -> &mut Headers {
&mut self.request_headers
}
/// returns a mutable reference to the response [headers](Headers)
pub fn response_headers_mut(&mut self) -> &mut Headers {
&mut self.response_headers
}
/// returns a reference to the response [headers](Headers)
pub fn response_headers(&self) -> &Headers {
&self.response_headers
}
/** sets the http status code from any `TryInto<Status>`.
```
# use trillium_http::{Conn, Method, Status};
# let mut conn = Conn::new_synthetic(Method::Get, "/", ());
assert!(conn.status().is_none());
conn.set_status(200); // a status can be set as a u16
assert_eq!(conn.status().unwrap(), Status::Ok);
conn.set_status(Status::ImATeapot); // or as a Status
assert_eq!(conn.status().unwrap(), Status::ImATeapot);
```
*/
pub fn set_status(&mut self, status: impl TryInto<Status>) {
self.status = Some(status.try_into().unwrap_or_else(|_| {
log::error!("attempted to set an invalid status code");
Status::InternalServerError
}));
}
/// retrieves the current response status code for this conn, if
/// it has been set. See [`Conn::set_status`] for example usage.
pub fn status(&self) -> Option<Status> {
self.status
}
/**
retrieves the path part of the request url, up to and excluding any query component
```
# use trillium_http::{Conn, Method};
let mut conn = Conn::new_synthetic(Method::Get, "/some/path?and&a=query", ());
assert_eq!(conn.path(), "/some/path");
```
*/
pub fn path(&self) -> &str {
match self.path.split_once('?') {
Some((path, _)) => path,
None => &self.path,
}
}
/// retrieves the combined path and any query
pub fn path_and_query(&self) -> &str {
&self.path
}
/**
retrieves the query component of the path
```
# use trillium_http::{Conn, Method};
let mut conn = Conn::new_synthetic(Method::Get, "/some/path?and&a=query", ());
assert_eq!(conn.querystring(), "and&a=query");
let mut conn = Conn::new_synthetic(Method::Get, "/some/path", ());
assert_eq!(conn.querystring(), "");
```
*/
pub fn querystring(&self) -> &str {
match self.path.split_once('?') {
Some((_, query)) => query,
None => "",
}
}
/// get the host for this conn, if it exists
pub fn host(&self) -> Option<&str> {
self.request_headers.get_str(Host)
}
/// set the host for this conn
pub fn set_host(&mut self, host: String) {
self.request_headers.insert(Host, host);
}
// pub fn url(&self) -> Result<Url> {
// let path = self.path();
// let host = self.host().unwrap_or_else(|| String::from("_"));
// let method = self.method();
// if path.starts_with("http://") || path.starts_with("https://") {
// Ok(Url::parse(path)?)
// } else if path.starts_with('/') {
// Ok(Url::parse(&format!("http://{}{}", host, path))?)
// } else if method == &Method::Connect {
// Ok(Url::parse(&format!("http://{}/", path))?)
// } else {
// Err(Error::UnexpectedUriFormat)
// }
// }
/**
Sets the response body to anything that is [`impl Into<Body>`][Body].
```
# use trillium_http::{Conn, Method, Body};
# let mut conn = Conn::new_synthetic(Method::Get, "/some/path?and&a=query", ());
conn.set_response_body("hello");
conn.set_response_body(String::from("hello"));
conn.set_response_body(vec![99, 97, 116]);
```
*/
pub fn set_response_body(&mut self, body: impl Into<Body>) {
self.response_body = Some(body.into());
}
/// returns a reference to the current response body, if it has been set
pub fn response_body(&self) -> Option<&Body> {
self.response_body.as_ref()
}
/**
remove the response body from this conn and return it
```
# use trillium_http::{Conn, Method};
# let mut conn = Conn::new_synthetic(Method::Get, "/some/path?and&a=query", ());
assert!(conn.response_body().is_none());
conn.set_response_body("hello");
assert!(conn.response_body().is_some());
let body = conn.take_response_body();
assert!(body.is_some());
assert!(conn.response_body().is_none());
```
*/
pub fn take_response_body(&mut self) -> Option<Body> {
self.response_body.take()
}
/**
returns the http method for this conn's request.
```
# use trillium_http::{Conn, Method};
let mut conn = Conn::new_synthetic(Method::Get, "/some/path?and&a=query", ());
assert_eq!(conn.method(), Method::Get);
```
*/
pub fn method(&self) -> Method {
self.method
}
/**
overrides the http method for this conn
*/
pub fn set_method(&mut self, method: Method) {
self.method = method;
}
/**
returns the http version for this conn.
*/
pub fn http_version(&self) -> Version {
self.version
}
fn needs_100_continue(&self) -> bool {
self.request_body_state == ReceivedBodyState::Start
&& self.version != Version::Http1_0
&& self
.request_headers
.eq_ignore_ascii_case(Expect, "100-continue")
}
#[allow(clippy::needless_borrow, clippy::needless_borrows_for_generic_args)]
fn build_request_body(&mut self) -> ReceivedBody<'_, Transport> {
ReceivedBody::new_with_config(
self.request_content_length().ok().flatten(),
&mut self.buffer,
&mut self.transport,
&mut self.request_body_state,
None,
encoding(&self.request_headers),
&self.http_config,
)
}
/**
returns the [`encoding_rs::Encoding`] for this request, as
determined from the mime-type charset, if available
```
# use trillium_http::{Conn, Method};
let mut conn = Conn::new_synthetic(Method::Get, "/", ());
assert_eq!(conn.request_encoding(), encoding_rs::WINDOWS_1252); // the default
conn.request_headers_mut().insert("content-type", "text/plain;charset=utf-16");
assert_eq!(conn.request_encoding(), encoding_rs::UTF_16LE);
```
*/
pub fn request_encoding(&self) -> &'static Encoding {
encoding(&self.request_headers)
}
/**
returns the [`encoding_rs::Encoding`] for this response, as
determined from the mime-type charset, if available
```
# use trillium_http::{Conn, Method};
let mut conn = Conn::new_synthetic(Method::Get, "/", ());
assert_eq!(conn.response_encoding(), encoding_rs::WINDOWS_1252); // the default
conn.response_headers_mut().insert("content-type", "text/plain;charset=utf-16");
assert_eq!(conn.response_encoding(), encoding_rs::UTF_16LE);
```
*/
pub fn response_encoding(&self) -> &'static Encoding {
encoding(&self.response_headers)
}
/**
returns a [`ReceivedBody`] that references this conn. the conn
retains all data and holds the singular transport, but the
`ReceivedBody` provides an interface to read body content
```
# async_io::block_on(async {
# use trillium_http::{Conn, Method};
let mut conn = Conn::new_synthetic(Method::Get, "/", "hello");
let request_body = conn.request_body().await;
assert_eq!(request_body.content_length(), Some(5));
assert_eq!(request_body.read_string().await.unwrap(), "hello");
# });
```
*/
pub async fn request_body(&mut self) -> ReceivedBody<'_, Transport> {
if self.needs_100_continue() {
self.send_100_continue().await.ok();
}
self.build_request_body()
}
/// returns a clone of the [`stopper::Stopper`] for this Conn. use
/// this to gracefully stop long-running futures and streams
/// inside of handler functions
pub fn stopper(&self) -> Stopper {
self.stopper.clone()
}
fn validate_headers(request_headers: &Headers) -> Result<()> {
let content_length = request_headers.has_header(ContentLength);
let transfer_encoding_chunked =
request_headers.eq_ignore_ascii_case(TransferEncoding, "chunked");
if content_length && transfer_encoding_chunked {
Err(Error::UnexpectedHeader("content-length"))
} else {
Ok(())
}
}
/// # Create a new `Conn`
///
/// This function creates a new conn from the provided
/// [`Transport`][crate::transport::Transport], as well as any
/// bytes that have already been read from the transport, and a
/// [`Stopper`] instance that will be used to signal graceful
/// shutdown.
///
/// # Errors
///
/// This will return an error variant if:
///
/// * there is an io error when reading from the underlying transport
/// * headers are too long
/// * we are unable to parse some aspect of the request
/// * the request is an unsupported http version
/// * we cannot make sense of the headers, such as if there is a
/// `content-length` header as well as a `transfer-encoding: chunked`
/// header.
pub async fn new(transport: Transport, bytes: Vec<u8>, stopper: Stopper) -> Result<Self> {
Self::new_with_config(DEFAULT_CONFIG, transport, bytes.into(), stopper).await
}
/// # Create a new `Conn`
///
/// This function creates a new conn from the provided
/// [`Transport`][crate::transport::Transport], as well as any
/// bytes that have already been read from the transport, and a
/// [`Stopper`] instance that will be used to signal graceful
/// shutdown.
///
/// # Errors
///
/// This will return an error variant if:
///
/// * there is an io error when reading from the underlying transport
/// * headers are too long
/// * we are unable to parse some aspect of the request
/// * the request is an unsupported http version
/// * we cannot make sense of the headers, such as if there is a
/// `content-length` header as well as a `transfer-encoding: chunked`
/// header.
async fn new_with_config(
http_config: HttpConfig,
mut transport: Transport,
mut buffer: Buffer,
stopper: Stopper,
) -> Result<Self> {
let (head_size, start_time) =
Self::head(&mut transport, &mut buffer, &stopper, &http_config).await?;
let mut headers = vec![EMPTY_HEADER; http_config.max_headers];
let mut httparse_req = Request::new(&mut headers);
let status = httparse_req.parse(&buffer[..])?;
if status.is_partial() {
return Err(Error::PartialHead);
}
let method = match httparse_req.method {
Some(method) => match method.parse() {
Ok(method) => method,
Err(_) => return Err(Error::UnrecognizedMethod(method.to_string())),
},
None => return Err(Error::MissingMethod),
};
let version = match httparse_req.version {
Some(0) => Version::Http1_0,
Some(1) => Version::Http1_1,
Some(version) => return Err(Error::UnsupportedVersion(version)),
None => return Err(Error::MissingVersion),
};
let mut request_headers = Headers::with_capacity(httparse_req.headers.len());
for header in httparse_req.headers {
let header_name = HeaderName::from_str(header.name)?;
let header_value = HeaderValue::from(header.value.to_owned());
request_headers.append(header_name, header_value);
}
Self::validate_headers(&request_headers)?;
let path = httparse_req
.path
.ok_or(Error::RequestPathMissing)?
.to_owned();
log::trace!("received:\n{method} {path} {version}\n{request_headers}");
let mut response_headers =
Headers::with_capacity(http_config.response_header_initial_capacity);
response_headers.insert(Server, SERVER);
buffer.ignore_front(head_size);
Ok(Self {
transport,
request_headers,
method,
version,
path,
buffer,
response_headers,
status: None,
state: StateSet::new(),
response_body: None,
request_body_state: ReceivedBodyState::Start,
secure: false,
stopper,
after_send: AfterSend::default(),
start_time,
peer_ip: None,
http_config,
})
}
/// predicate function to indicate whether the connection is
/// secure. note that this does not necessarily indicate that the
/// transport itself is secure, as it may indicate that
/// `trillium_http` is behind a trusted reverse proxy that has
/// terminated tls and provided appropriate headers to indicate
/// this.
pub fn is_secure(&self) -> bool {
self.secure
}
/// set whether the connection should be considered secure. note
/// that this does not necessarily indicate that the transport
/// itself is secure, as it may indicate that `trillium_http` is
/// behind a trusted reverse proxy that has terminated tls and
/// provided appropriate headers to indicate this.
pub fn set_secure(&mut self, secure: bool) {
self.secure = secure;
}
/**
calculates any auto-generated headers for this conn prior to sending it
*/
pub fn finalize_headers(&mut self) {
if self.status == Some(Status::SwitchingProtocols) {
return;
}
self.response_headers
.try_insert_with(Date, || httpdate::fmt_http_date(SystemTime::now()));
if !matches!(self.status, Some(Status::NotModified | Status::NoContent)) {
if let Some(len) = self.body_len() {
self.response_headers
.try_insert(ContentLength, len.to_string());
}
if self.version == Version::Http1_1 && !self.response_headers.has_header(ContentLength)
{
self.response_headers.insert(TransferEncoding, "chunked");
} else {
self.response_headers.remove(TransferEncoding);
}
}
if self.stopper.is_stopped() {
self.response_headers.insert(Connection, "close");
}
}
/**
Registers a function to call after the http response has been
completely transferred. Please note that this is a sync function
and should be computationally lightweight. If your _application_
needs additional async processing, use your runtime's task spawn
within this hook. If your _library_ needs additional async
processing in an `after_send` hook, please open an issue. This hook
is currently designed for simple instrumentation and logging, and
should be thought of as equivalent to a Drop hook.
*/
pub fn after_send<F>(&mut self, after_send: F)
where
F: FnOnce(SendStatus) + Send + Sync + 'static,
{
self.after_send.append(after_send);
}
/// The [`Instant`] that the first header bytes for this conn were
/// received, before any processing or parsing has been performed.
pub fn start_time(&self) -> Instant {
self.start_time
}
async fn send_100_continue(&mut self) -> Result<()> {
log::trace!("sending 100-continue");
Ok(self
.transport
.write_all(b"HTTP/1.1 100 Continue\r\n\r\n")
.await?)
}
async fn head(
transport: &mut Transport,
buf: &mut Buffer,
stopper: &Stopper,
http_config: &HttpConfig,
) -> Result<(usize, Instant)> {
let mut len = 0;
let mut start_with_read = buf.is_empty();
let mut instant = None;
let finder = Finder::new(b"\r\n\r\n");
loop {
if len >= http_config.head_max_len {
return Err(Error::HeadersTooLong);
}
let bytes = if start_with_read {
buf.expand();
if len == 0 {
stopper
.stop_future(transport.read(buf))
.await
.ok_or(Error::Closed)??
} else {
transport.read(&mut buf[len..]).await?
}
} else {
start_with_read = true;
buf.len()
};
if instant.is_none() {
instant = Some(Instant::now());
}
let search_start = len.max(3) - 3;
let search = finder.find(&buf[search_start..]);
if let Some(index) = search {
buf.truncate(len + bytes);
return Ok((search_start + index + 4, instant.unwrap()));
}
len += bytes;
if bytes == 0 {
return if len == 0 {
Err(Error::Closed)
} else {
Err(Error::PartialHead)
};
}
}
}
async fn next(mut self) -> Result<Self> {
if !self.needs_100_continue() || self.request_body_state != ReceivedBodyState::Start {
self.build_request_body().drain().await?;
}
Conn::new_with_config(self.http_config, self.transport, self.buffer, self.stopper).await
}
fn should_close(&self) -> bool {
let request_connection = self.request_headers.get_lower(Connection);
let response_connection = self.response_headers.get_lower(Connection);
match (
request_connection.as_deref(),
response_connection.as_deref(),
) {
(Some("keep-alive"), Some("keep-alive")) => false,
(Some("close"), _) | (_, Some("close")) => true,
_ => self.version == Version::Http1_0,
}
}
fn should_upgrade(&self) -> bool {
(self.method() == Method::Connect && self.status == Some(Status::Ok))
|| self.status == Some(Status::SwitchingProtocols)
}
async fn finish(self) -> Result<ConnectionStatus<Transport>> {
if self.should_close() {
Ok(ConnectionStatus::Close)
} else if self.should_upgrade() {
Ok(ConnectionStatus::Upgrade(self.into()))
} else {
match self.next().await {
Err(Error::Closed) => {
log::trace!("connection closed by client");
Ok(ConnectionStatus::Close)
}
Err(e) => Err(e),
Ok(conn) => Ok(ConnectionStatus::Conn(conn)),
}
}
}
fn request_content_length(&self) -> Result<Option<u64>> {
if self
.request_headers
.eq_ignore_ascii_case(TransferEncoding, "chunked")
{
Ok(None)
} else if let Some(cl) = self.request_headers.get_str(ContentLength) {
cl.parse()
.map(Some)
.map_err(|_| Error::MalformedHeader("content-length".into()))
} else {
Ok(Some(0))
}
}
fn body_len(&self) -> Option<u64> {
match self.response_body {
Some(ref body) => body.len(),
None => Some(0),
}
}
fn write_headers(&mut self, output_buffer: &mut Vec<u8>) -> std::io::Result<()> {
use std::io::Write;
let status = self.status().unwrap_or(Status::NotFound);
write!(
output_buffer,
"{} {} {}\r\n",
self.version,
status as u16,
status.canonical_reason()
)?;
self.finalize_headers();
log::trace!(
"sending:\n{} {}\n{}",
self.version,
status,
&self.response_headers
);
for (header, values) in &self.response_headers {
for value in values {
write!(output_buffer, "{header}: ")?;
output_buffer.extend_from_slice(value.as_ref());
write!(output_buffer, "\r\n")?;
}
}
write!(output_buffer, "\r\n")?;
Ok(())
}
/// applies a mapping function from one transport to another. This
/// is particularly useful for boxing the transport. unless you're
/// sure this is what you're looking for, you probably don't want
/// to be using this
pub fn map_transport<T: AsyncRead + AsyncWrite + Send + Sync + Unpin + 'static>(
self,
f: impl Fn(Transport) -> T,
) -> Conn<T> {
let Conn {
request_headers,
response_headers,
path,
status,
version,
state,
transport,
buffer,
request_body_state,
secure,
method,
response_body,
stopper,
after_send,
start_time,
peer_ip,
http_config,
} = self;
Conn {
request_headers,
response_headers,
method,
response_body,
path,
status,
version,
state,
transport: f(transport),
buffer,
request_body_state,
secure,
stopper,
after_send,
start_time,
peer_ip,
http_config,
}
}
/// Get a reference to the transport.
pub fn transport(&self) -> &Transport {
&self.transport
}
/// Get a mutable reference to the transport.
///
/// This should only be used to call your own custom methods on the transport that do not read
/// or write any data. Calling any method that reads from or writes to the transport will
/// disrupt the HTTP protocol. If you're looking to transition from HTTP to another protocol,
/// use an HTTP upgrade.
pub fn transport_mut(&mut self) -> &mut Transport {
&mut self.transport
}
/// sets the remote ip address for this conn, if available.
pub fn set_peer_ip(&mut self, peer_ip: Option<IpAddr>) {
self.peer_ip = peer_ip;
}
/// retrieves the remote ip address for this conn, if available.
pub fn peer_ip(&self) -> Option<IpAddr> {
self.peer_ip
}
}