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https://github.com/facebook/sapling.git
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9fa292b9ed
Reviewed By: genevievehelsel Differential Revision: D36429182 fbshipit-source-id: 7d355917abf463493c37139856810de13e1090ff
89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#include "eden/fs/utils/IoFuture.h"
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#include <folly/futures/Future.h>
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#include <folly/futures/Promise.h>
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#include <folly/io/async/AsyncTimeout.h>
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#include <folly/io/async/EventHandler.h>
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#include <folly/logging/xlog.h>
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using folly::EventBase;
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using folly::Promise;
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using std::make_unique;
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namespace facebook::eden {
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IoFuture::IoFuture(folly::EventBase* eventBase, int socket)
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: EventHandler{eventBase, folly::NetworkSocket::fromFd(socket)},
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AsyncTimeout{eventBase},
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promise_{Promise<int>::makeEmpty()} {}
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folly::Future<int> IoFuture::wait(
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int eventFlags,
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folly::TimeoutManager::timeout_type timeout) {
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// wait() may be called multiple times.
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// If someone is calling wait() again before the previous wait() finished,
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// fail the previously returned future with an exception indicating that the
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// I/O wait was canceled.
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if (!promise_.isFulfilled()) {
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promise_.setException(std::system_error(
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ECANCELED, std::generic_category(), "I/O wait canceled"));
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}
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promise_ = Promise<int>{};
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// We do not support using the EventHandler::PERSIST flag.
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// folly::Future objects are one-shot, so it doesn't make sense to repeatedly
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// wait for I/O to be ready using a Future.
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XCHECK(!(eventFlags & EventHandler::PERSIST));
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auto future = promise_.getFuture();
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// Register a timeout in case the remote side does not send
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// credentials soon.
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if (!scheduleTimeout(timeout)) {
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promise_.setException(std::system_error(
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EIO, std::generic_category(), "error registering for socket I/O"));
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return future;
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}
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// Register for the requested I/O event
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if (!registerHandler(eventFlags)) {
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promise_.setException(std::system_error(
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EIO, std::generic_category(), "error registering for socket I/O"));
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return future;
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}
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return future;
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}
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void IoFuture::handlerReady(uint16_t events) noexcept {
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cancelTimeout();
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promise_.setValue(events);
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}
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void IoFuture::timeoutExpired() noexcept {
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unregisterHandler();
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promise_.setException(std::system_error(
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ETIMEDOUT, std::generic_category(), "timed out waiting for socket I/O"));
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}
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folly::Future<int> waitForIO(
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EventBase* eventBase,
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int socket,
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int eventFlags,
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folly::TimeoutManager::timeout_type timeout) {
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return folly::makeFutureWith([&] {
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auto ioFuture = make_unique<IoFuture>(eventBase, socket);
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auto f = ioFuture.get();
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return f->wait(eventFlags, timeout).ensure([iof = std::move(ioFuture)] {});
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});
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}
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} // namespace facebook::eden
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