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/*
* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "net/dcsctp/socket/callback_deferrer.h"
#include "api/make_ref_counted.h"
namespace dcsctp {
namespace {
// A wrapper around the move-only DcSctpMessage, to let it be captured in a
// lambda.
class MessageDeliverer {
public:
explicit MessageDeliverer(DcSctpMessage&& message)
: state_(rtc::make_ref_counted<State>(std::move(message))) {}
void Deliver(DcSctpSocketCallbacks& c) {
// Really ensure that it's only called once.
RTC_DCHECK(!state_->has_delivered);
state_->has_delivered = true;
c.OnMessageReceived(std::move(state_->message));
}
private:
struct State : public rtc::RefCountInterface {
explicit State(DcSctpMessage&& m)
: has_delivered(false), message(std::move(m)) {}
bool has_delivered;
DcSctpMessage message;
};
rtc::scoped_refptr<State> state_;
};
} // namespace
void CallbackDeferrer::Prepare() {
RTC_DCHECK(!prepared_);
prepared_ = true;
}
void CallbackDeferrer::TriggerDeferred() {
// Need to swap here. The client may call into the library from within a
// callback, and that might result in adding new callbacks to this instance,
// and the vector can't be modified while iterated on.
RTC_DCHECK(prepared_);
std::vector<std::function<void(DcSctpSocketCallbacks & cb)>> deferred;
deferred.swap(deferred_);
prepared_ = false;
for (auto& cb : deferred) {
cb(underlying_);
}
}
SendPacketStatus CallbackDeferrer::SendPacketWithStatus(
rtc::ArrayView<const uint8_t> data) {
// Will not be deferred - call directly.
return underlying_.SendPacketWithStatus(data);
}
std::unique_ptr<Timeout> CallbackDeferrer::CreateTimeout(
webrtc::TaskQueueBase::DelayPrecision precision) {
// Will not be deferred - call directly.
return underlying_.CreateTimeout(precision);
}
TimeMs CallbackDeferrer::TimeMillis() {
// Will not be deferred - call directly.
return underlying_.TimeMillis();
}
uint32_t CallbackDeferrer::GetRandomInt(uint32_t low, uint32_t high) {
// Will not be deferred - call directly.
return underlying_.GetRandomInt(low, high);
}
void CallbackDeferrer::OnMessageReceived(DcSctpMessage message) {
RTC_DCHECK(prepared_);
deferred_.emplace_back(
[deliverer = MessageDeliverer(std::move(message))](
DcSctpSocketCallbacks& cb) mutable { deliverer.Deliver(cb); });
}
void CallbackDeferrer::OnError(ErrorKind error, absl::string_view message) {
RTC_DCHECK(prepared_);
deferred_.emplace_back(
[error, message = std::string(message)](DcSctpSocketCallbacks& cb) {
cb.OnError(error, message);
});
}
void CallbackDeferrer::OnAborted(ErrorKind error, absl::string_view message) {
RTC_DCHECK(prepared_);
deferred_.emplace_back(
[error, message = std::string(message)](DcSctpSocketCallbacks& cb) {
cb.OnAborted(error, message);
});
}
void CallbackDeferrer::OnConnected() {
RTC_DCHECK(prepared_);
deferred_.emplace_back([](DcSctpSocketCallbacks& cb) { cb.OnConnected(); });
}
void CallbackDeferrer::OnClosed() {
RTC_DCHECK(prepared_);
deferred_.emplace_back([](DcSctpSocketCallbacks& cb) { cb.OnClosed(); });
}
void CallbackDeferrer::OnConnectionRestarted() {
RTC_DCHECK(prepared_);
deferred_.emplace_back(
[](DcSctpSocketCallbacks& cb) { cb.OnConnectionRestarted(); });
}
void CallbackDeferrer::OnStreamsResetFailed(
rtc::ArrayView<const StreamID> outgoing_streams,
absl::string_view reason) {
RTC_DCHECK(prepared_);
deferred_.emplace_back(
[streams = std::vector<StreamID>(outgoing_streams.begin(),
outgoing_streams.end()),
reason = std::string(reason)](DcSctpSocketCallbacks& cb) {
cb.OnStreamsResetFailed(streams, reason);
});
}
void CallbackDeferrer::OnStreamsResetPerformed(
rtc::ArrayView<const StreamID> outgoing_streams) {
RTC_DCHECK(prepared_);
deferred_.emplace_back(
[streams = std::vector<StreamID>(outgoing_streams.begin(),
outgoing_streams.end())](
DcSctpSocketCallbacks& cb) { cb.OnStreamsResetPerformed(streams); });
}
void CallbackDeferrer::OnIncomingStreamsReset(
rtc::ArrayView<const StreamID> incoming_streams) {
RTC_DCHECK(prepared_);
deferred_.emplace_back(
[streams = std::vector<StreamID>(incoming_streams.begin(),
incoming_streams.end())](
DcSctpSocketCallbacks& cb) { cb.OnIncomingStreamsReset(streams); });
}
void CallbackDeferrer::OnBufferedAmountLow(StreamID stream_id) {
RTC_DCHECK(prepared_);
deferred_.emplace_back([stream_id](DcSctpSocketCallbacks& cb) {
cb.OnBufferedAmountLow(stream_id);
});
}
void CallbackDeferrer::OnTotalBufferedAmountLow() {
RTC_DCHECK(prepared_);
deferred_.emplace_back(
[](DcSctpSocketCallbacks& cb) { cb.OnTotalBufferedAmountLow(); });
}
void CallbackDeferrer::OnLifecycleMessageExpired(LifecycleId lifecycle_id,
bool maybe_delivered) {
// Will not be deferred - call directly.
underlying_.OnLifecycleMessageExpired(lifecycle_id, maybe_delivered);
}
void CallbackDeferrer::OnLifecycleMessageFullySent(LifecycleId lifecycle_id) {
// Will not be deferred - call directly.
underlying_.OnLifecycleMessageFullySent(lifecycle_id);
}
void CallbackDeferrer::OnLifecycleMessageDelivered(LifecycleId lifecycle_id) {
// Will not be deferred - call directly.
underlying_.OnLifecycleMessageDelivered(lifecycle_id);
}
void CallbackDeferrer::OnLifecycleEnd(LifecycleId lifecycle_id) {
// Will not be deferred - call directly.
underlying_.OnLifecycleEnd(lifecycle_id);
}
} // namespace dcsctp
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