123 lines
3.4 KiB
Rust
123 lines
3.4 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use std::{io, thread, time};
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use std::sync::{atomic, mpsc, Arc};
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use util::Mutex;
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use futures::{self, Future};
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use fetch::{self, Fetch};
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pub struct FetchControl {
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sender: mpsc::Sender<()>,
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fetch: FakeFetch,
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}
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impl FetchControl {
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pub fn respond(self) {
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self.sender.send(())
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.expect("Fetch cannot be finished without sending a response at least once.");
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}
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pub fn wait_for_requests(&self, len: usize) {
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const MAX_TIMEOUT_MS: u64 = 5000;
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const ATTEMPTS: u64 = 10;
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let mut attempts_left = ATTEMPTS;
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loop {
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let current = self.fetch.requested.lock().len();
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if current == len {
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break;
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} else if attempts_left == 0 {
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panic!(
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"Timeout reached when waiting for pending requests. Expected: {}, current: {}",
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len, current
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);
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} else {
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attempts_left -= 1;
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// Should we handle spurious timeouts better?
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thread::park_timeout(time::Duration::from_millis(MAX_TIMEOUT_MS / ATTEMPTS));
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}
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}
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}
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}
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#[derive(Clone, Default)]
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pub struct FakeFetch {
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manual: Arc<Mutex<Option<mpsc::Receiver<()>>>>,
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response: Arc<Mutex<Option<&'static [u8]>>>,
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asserted: Arc<atomic::AtomicUsize>,
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requested: Arc<Mutex<Vec<String>>>,
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}
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impl FakeFetch {
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pub fn set_response(&self, data: &'static [u8]) {
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*self.response.lock() = Some(data);
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}
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pub fn manual(&self) -> FetchControl {
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assert!(self.manual.lock().is_none(), "Only one manual control may be active.");
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let (tx, rx) = mpsc::channel();
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*self.manual.lock() = Some(rx);
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FetchControl {
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sender: tx,
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fetch: self.clone(),
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}
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}
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pub fn assert_requested(&self, url: &str) {
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let requests = self.requested.lock();
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let idx = self.asserted.fetch_add(1, atomic::Ordering::SeqCst);
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assert_eq!(requests.get(idx), Some(&url.to_owned()), "Expected fetch from specific URL.");
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}
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pub fn assert_no_more_requests(&self) {
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let requests = self.requested.lock();
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let len = self.asserted.load(atomic::Ordering::SeqCst);
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assert_eq!(requests.len(), len, "Didn't expect any more requests, got: {:?}", &requests[len..]);
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}
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}
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impl Fetch for FakeFetch {
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type Result = futures::BoxFuture<fetch::Response, fetch::Error>;
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fn new() -> Result<Self, fetch::Error> where Self: Sized {
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Ok(FakeFetch::default())
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}
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fn fetch_with_abort(&self, url: &str, _abort: fetch::Abort) -> Self::Result {
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self.requested.lock().push(url.into());
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let manual = self.manual.clone();
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let response = self.response.clone();
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let (tx, rx) = futures::oneshot();
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thread::spawn(move || {
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if let Some(rx) = manual.lock().take() {
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// wait for manual resume
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let _ = rx.recv();
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}
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let data = response.lock().take().unwrap_or(b"Some content");
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let cursor = io::Cursor::new(data);
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tx.complete(fetch::Response::from_reader(cursor));
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});
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rx.map_err(|_| fetch::Error::Aborted).boxed()
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}
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}
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