blob: c638c88b728815a9d155af11ce81347f1dd004e7 [file] [log] [blame]
// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <fuchsia/sys/cpp/fidl.h>
#include <string>
#include <fs/vfs.h>
#include "src/lib/backoff/exponential_backoff.h"
namespace component {
struct ExportedDirChannels {
// The client side of the channel serving connected application's exported
// dir.
zx::channel exported_dir;
// The server side of our client's
// |fuchsia::sys::LaunchInfo.directory_request|.
zx::channel client_request;
class Util {
static std::string GetLabelFromURL(const std::string& url);
static ExportedDirChannels BindDirectory(fuchsia::sys::LaunchInfo* launch_info);
static std::string GetArgsString(const ::fidl::VectorPtr<::std::string>& arguments);
static zx::channel OpenAsDirectory(fs::Vfs* vfs, fbl::RefPtr<fs::Vnode> node);
// RestartBackOff wraps the functionality of computing sleep intervals for a
// crashing service under the following assumptions:
// 1) The service may fail to start due to transient issues, in which case we
// want to continue retrying until it starts.
// 2) The service may be permanently failing, in which case we want to wait at
// increasing intervals to avoid rapid crash looping.
// 3) The service may intermittently crash long into execution,
// in which case we want to restart as soon as possible to bring the system into
// a working state.
class RestartBackOff {
// Construct a new backoff utility that computes exponentially increasing
// sleep intervals between min_backoff and max_backoff.
// If the duration between Start and a call to GetNext is greater than
// alive_reset_limit, reset the backoff.
RestartBackOff(zx::duration min_backoff, zx::duration max_backoff,
zx::duration alive_reset_limit);
// Gets the next duration to sleep for.
zx::duration GetNext();
// Mark that the service was started at the current time.
void Start();
virtual zx::time GetCurrentTime() const;
backoff::ExponentialBackoff backoff_;
const zx::duration alive_reset_limit_;
zx::time start_time_;
} // namespace component