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|
//! A generic HTTP uploader.
use std::{net::SocketAddr, sync::Arc, time::Duration};
use async_trait::async_trait;
use tor_error::HasKind;
use tor_rtcompat::{NetStreamProvider, Runtime, SleepProviderExt};
use crate::{UploadError, Uploader};
/// An [`Uploader`] implementation that uses `tor_dirclient` to make a direct HTTP request,
/// not over the Tor network.
///
/// The targets for this uploader are *lists* of IP addresses:
/// Each target represents a *single* directory,
/// so we attempt to upload to at most one address in each target.
pub struct DirectHttpUploader<R> {
/// A runtime to use for opening TCP connections and creating timers.
runtime: R,
/// How long should we delay for 503 responses?
polite_delay: Duration,
}
/// A failure to upload not counted under some other error type.
#[derive(Clone, Debug, thiserror::Error)]
enum HttpUploadError {
/// The request required anonymity, and this uploader only supports direct requests.
#[error("Request type requires anonymity")]
RequiresAnonymity,
/// We tried to upload to a Target with no actual addresses.
#[error("No address for target")]
NoAddress,
}
impl HasKind for HttpUploadError {
fn kind(&self) -> tor_error::ErrorKind {
tor_error::ErrorKind::BadApiUsage
}
}
#[async_trait]
impl<R: Runtime> Uploader for DirectHttpUploader<R> {
type Doc = dyn tor_dirclient::request::Requestable;
type Target = Vec<SocketAddr>;
async fn upload(
&self,
target: Arc<Vec<SocketAddr>>,
doc: Arc<dyn tor_dirclient::request::Requestable>,
) -> Result<(), UploadError> {
if doc.anonymized() != tor_dirclient::AnonymizedRequest::Direct {
return Err(UploadError::DocumentFailedPermanently(Arc::new(
HttpUploadError::RequiresAnonymity,
) as _));
}
let mut conn = self.connect(target.as_ref()).await?;
let source_info = None;
// (This method already checks for timeouts, so we don't have to.)
let response =
tor_dirclient::send_request(&self.runtime, &doc, &mut conn, source_info).await;
UploadError::from_directory_response(response)
.map_err(|e| e.set_503_delay(self.polite_delay))
}
}
impl<R: Runtime> DirectHttpUploader<R> {
/// Create a new [`DirectHttpUploader`].
///
/// Does not launch any requests; use a [`Publisher`](super::Publisher) for that.
pub fn new(runtime: R) -> Self {
Self {
runtime,
polite_delay: Duration::new(15 * 60, 0), // Arbitrary! Should be lower for authorities!
}
}
/// Open a new connection to one of the addresses in `target`.
async fn connect(
&self,
target: &[SocketAddr],
) -> Result<<R as NetStreamProvider>::Stream, UploadError> {
/// How long should we wait for a given connect attempt to succeed or fail?
const CONNECT_TIMEOUT: Duration = Duration::new(30, 0);
let connect_options = Default::default();
let mut last_error = None;
// TODO: Happy eyeballs?
// TODO: Return all errors?
for addr in target {
let connect_res = self
.runtime
.timeout(
CONNECT_TIMEOUT,
self.runtime.connect(addr, &connect_options),
)
.await;
match connect_res {
Ok(Ok(conn)) => return Ok(conn),
Ok(Err(e)) => last_error = Some(UploadError::Connect(Arc::new(e))),
Err(_timeout) => last_error = Some(UploadError::Timeout),
}
}
Err(last_error.unwrap_or_else(|| {
UploadError::DocumentFailedPermanently(Arc::new(HttpUploadError::NoAddress) as _)
}))
}
}
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