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use std::cell::RefCell;use std::rc::Rc;
use deno_core::error::bad_resource;use deno_core::error::bad_resource_id;use deno_core::error::custom_error;use deno_core::error::AnyError;use deno_core::op;use deno_core::Extension;use deno_core::OpState;use deno_core::RcRef;use deno_core::ResourceId;use deno_core::ZeroCopyBuf;use deno_http::http_create_conn_resource;use deno_http::HttpRequestReader;use deno_http::HttpStreamResource;use deno_net::io::TcpStreamResource;use deno_net::ops_tls::TlsStream;use deno_net::ops_tls::TlsStreamResource;use hyper::upgrade::Parts;use serde::Serialize;use tokio::net::TcpStream;
#[cfg(unix)]use deno_net::io::UnixStreamResource;#[cfg(unix)]use tokio::net::UnixStream;
pub fn init() -> Extension {  Extension::builder()    .ops(vec![      op_http_start::decl(),      op_http_upgrade::decl(),      op_flash_upgrade_http::decl(),    ])    .build()}
#[op]fn op_http_start(  state: &mut OpState,  tcp_stream_rid: ResourceId,) -> Result<ResourceId, AnyError> {  if let Ok(resource_rc) = state    .resource_table    .take::<TcpStreamResource>(tcp_stream_rid)  {    // This TCP connection might be used somewhere else. If it's the case, we cannot proceed with the    // process of starting a HTTP server on top of this TCP connection, so we just return a bad    // resource error. See also: https://github.com/denoland/deno/pull/16242    let resource = Rc::try_unwrap(resource_rc)      .map_err(|_| bad_resource("TCP stream is currently in use"))?;    let (read_half, write_half) = resource.into_inner();    let tcp_stream = read_half.reunite(write_half)?;    let addr = tcp_stream.local_addr()?;    return http_create_conn_resource(state, tcp_stream, addr, "http");  }
  if let Ok(resource_rc) = state    .resource_table    .take::<TlsStreamResource>(tcp_stream_rid)  {    // This TLS connection might be used somewhere else. If it's the case, we cannot proceed with the    // process of starting a HTTP server on top of this TLS connection, so we just return a bad    // resource error. See also: https://github.com/denoland/deno/pull/16242    let resource = Rc::try_unwrap(resource_rc)      .map_err(|_| bad_resource("TLS stream is currently in use"))?;    let (read_half, write_half) = resource.into_inner();    let tls_stream = read_half.reunite(write_half);    let addr = tls_stream.get_ref().0.local_addr()?;    return http_create_conn_resource(state, tls_stream, addr, "https");  }
  #[cfg(unix)]  if let Ok(resource_rc) = state    .resource_table    .take::<deno_net::io::UnixStreamResource>(tcp_stream_rid)  {    super::check_unstable(state, "Deno.serveHttp");
    // This UNIX socket might be used somewhere else. If it's the case, we cannot proceed with the    // process of starting a HTTP server on top of this UNIX socket, so we just return a bad    // resource error. See also: https://github.com/denoland/deno/pull/16242    let resource = Rc::try_unwrap(resource_rc)      .map_err(|_| bad_resource("UNIX stream is currently in use"))?;    let (read_half, write_half) = resource.into_inner();    let unix_stream = read_half.reunite(write_half)?;    let addr = unix_stream.local_addr()?;    return http_create_conn_resource(state, unix_stream, addr, "http+unix");  }
  Err(bad_resource_id())}
#[op]fn op_flash_upgrade_http(  state: &mut OpState,  token: u32,  server_id: u32,) -> Result<deno_core::ResourceId, AnyError> {  let flash_ctx = state.borrow_mut::<deno_flash::FlashContext>();  let ctx = flash_ctx.servers.get_mut(&server_id).unwrap();
  let tcp_stream = deno_flash::detach_socket(ctx, token)?;  Ok(    state      .resource_table      .add(TcpStreamResource::new(tcp_stream.into_split())),  )}
#[derive(Serialize)]#[serde(rename_all = "camelCase")]pub struct HttpUpgradeResult {  conn_rid: ResourceId,  conn_type: &'static str,  read_buf: ZeroCopyBuf,}
#[op]async fn op_http_upgrade(  state: Rc<RefCell<OpState>>,  rid: ResourceId,  _: (),) -> Result<HttpUpgradeResult, AnyError> {  let stream = state    .borrow_mut()    .resource_table    .get::<HttpStreamResource>(rid)?;  let mut rd = RcRef::map(&stream, |r| &r.rd).borrow_mut().await;
  let request = match &mut *rd {    HttpRequestReader::Headers(request) => request,    _ => {      return Err(custom_error(        "Http",        "cannot upgrade because request body was used",      ))    }  };
  let transport = hyper::upgrade::on(request).await?;  let transport = match transport.downcast::<TcpStream>() {    Ok(Parts {      io: tcp_stream,      read_buf,      ..    }) => {      return Ok(HttpUpgradeResult {        conn_type: "tcp",        conn_rid: state          .borrow_mut()          .resource_table          .add(TcpStreamResource::new(tcp_stream.into_split())),        read_buf: read_buf.to_vec().into(),      });    }    Err(transport) => transport,  };  #[cfg(unix)]  let transport = match transport.downcast::<UnixStream>() {    Ok(Parts {      io: unix_stream,      read_buf,      ..    }) => {      return Ok(HttpUpgradeResult {        conn_type: "unix",        conn_rid: state          .borrow_mut()          .resource_table          .add(UnixStreamResource::new(unix_stream.into_split())),        read_buf: read_buf.to_vec().into(),      });    }    Err(transport) => transport,  };  match transport.downcast::<TlsStream>() {    Ok(Parts {      io: tls_stream,      read_buf,      ..    }) => Ok(HttpUpgradeResult {      conn_type: "tls",      conn_rid: state        .borrow_mut()        .resource_table        .add(TlsStreamResource::new(tls_stream.into_split())),      read_buf: read_buf.to_vec().into(),    }),    Err(_) => Err(custom_error(      "Http",      "encountered unsupported transport while upgrading",    )),  }}