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// Copyright (C) 2017 Author: Arun Raghavan <arun@arunraghavan.net>
//
// This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at
// <https://mozilla.org/MPL/2.0/>.
//
// SPDX-License-Identifier: MPL-2.0
use aws_config::meta::region::RegionProviderChain;
use aws_sdk_s3::{Credentials, Region};
use aws_types::sdk_config::SdkConfig;
use aws_smithy_http::byte_stream::{ByteStream, Error};
use aws_smithy_types::{timeout, tristate::TriState};
use bytes::{buf::BufMut, Bytes, BytesMut};
use futures::stream::TryStreamExt;
use futures::{future, Future};
use once_cell::sync::Lazy;
use std::sync::Mutex;
use std::time::Duration;
use tokio::runtime;
const DEFAULT_S3_REGION: &str = "us-west-2";
static RUNTIME: Lazy<runtime::Runtime> = Lazy::new(|| {
runtime::Builder::new_multi_thread()
.enable_all()
.worker_threads(2)
.thread_name("gst-aws-runtime")
.build()
.unwrap()
});
#[derive(Debug)]
pub enum WaitError<E> {
Cancelled,
FutureError(E),
}
pub fn wait<F, T, E>(
canceller: &Mutex<Option<future::AbortHandle>>,
future: F,
) -> Result<T, WaitError<E>>
where
F: Send + Future<Output = Result<T, E>>,
F::Output: Send,
T: Send,
E: Send,
{
let mut canceller_guard = canceller.lock().unwrap();
let (abort_handle, abort_registration) = future::AbortHandle::new_pair();
canceller_guard.replace(abort_handle);
drop(canceller_guard);
let abortable_future = future::Abortable::new(future, abort_registration);
// FIXME: add a timeout as well
let res = {
let _enter = RUNTIME.enter();
futures::executor::block_on(async {
match abortable_future.await {
// Future resolved successfully
Ok(Ok(res)) => Ok(res),
// Future resolved with an error
Ok(Err(err)) => Err(WaitError::FutureError(err)),
// Canceller called before future resolved
Err(future::Aborted) => Err(WaitError::Cancelled),
}
})
};
/* Clear out the canceller */
canceller_guard = canceller.lock().unwrap();
*canceller_guard = None;
res
}
pub fn wait_stream(
canceller: &Mutex<Option<future::AbortHandle>>,
stream: &mut ByteStream,
) -> Result<Bytes, WaitError<Error>> {
wait(canceller, async move {
let mut collect = BytesMut::new();
// Loop over the stream and collect till we're done
while let Some(item) = stream.try_next().await? {
collect.put(item)
}
Ok::<Bytes, Error>(collect.freeze())
})
}
// See setting-timeouts example in aws-sdk-rust.
pub fn timeout_config(request_timeout: Duration) -> timeout::Config {
timeout::Config::new().with_api_timeouts(
timeout::Api::new()
// This timeout acts at the "Request to a service" level. When the SDK makes a request to a
// service, that "request" can contain several HTTP requests. This way, you can retry
// failures that are likely spurious, or refresh credentials.
.with_call_timeout(TriState::Set(request_timeout))
// This timeout acts at the "HTTP request" level and sets a separate timeout for each
// HTTP request made as part of a "service request."
.with_call_attempt_timeout(TriState::Set(request_timeout)),
)
}
pub fn wait_config(
canceller: &Mutex<Option<future::AbortHandle>>,
region: Region,
timeout_config: timeout::Config,
credentials: Option<Credentials>,
) -> Result<SdkConfig, WaitError<Error>> {
let region_provider = RegionProviderChain::first_try(region)
.or_default_provider()
.or_else(Region::new(DEFAULT_S3_REGION));
let config_future = match credentials {
Some(cred) => aws_config::from_env()
.timeout_config(timeout_config)
.region(region_provider)
.credentials_provider(cred)
.load(),
None => aws_config::from_env()
.timeout_config(timeout_config)
.region(region_provider)
.load(),
};
let mut canceller_guard = canceller.lock().unwrap();
let (abort_handle, abort_registration) = future::AbortHandle::new_pair();
canceller_guard.replace(abort_handle);
drop(canceller_guard);
let abortable_future = future::Abortable::new(config_future, abort_registration);
let res = {
let _enter = RUNTIME.enter();
futures::executor::block_on(async {
match abortable_future.await {
// Future resolved successfully
Ok(config) => Ok(config),
// Canceller called before future resolved
Err(future::Aborted) => Err(WaitError::Cancelled),
}
})
};
/* Clear out the canceller */
canceller_guard = canceller.lock().unwrap();
*canceller_guard = None;
res
}
pub fn duration_from_millis(millis: i64) -> Duration {
match millis {
-1 => Duration::MAX,
v => Duration::from_millis(v as u64),
}
}
pub fn duration_to_millis(dur: Option<Duration>) -> i64 {
match dur {
None => Duration::MAX.as_millis() as i64,
Some(d) => d.as_millis() as i64,
}
}
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