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// Copyright 2018 The Chromium 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 "osp/impl/quic/quic_server.h"
#include <functional>
#include <memory>
#include "platform/api/task_runner.h"
#include "platform/api/time.h"
#include "util/osp_logging.h"
namespace openscreen {
namespace osp {
QuicServer::QuicServer(
const ServerConfig& config,
MessageDemuxer* demuxer,
std::unique_ptr<QuicConnectionFactory> connection_factory,
ProtocolConnectionServer::Observer* observer,
ClockNowFunctionPtr now_function,
TaskRunner* task_runner)
: ProtocolConnectionServer(demuxer, observer),
connection_endpoints_(config.connection_endpoints),
connection_factory_(std::move(connection_factory)),
cleanup_alarm_(now_function, task_runner) {}
QuicServer::~QuicServer() {
CloseAllConnections();
}
bool QuicServer::Start() {
if (state_ != State::kStopped)
return false;
state_ = State::kRunning;
connection_factory_->SetServerDelegate(this, connection_endpoints_);
Cleanup(); // Start periodic clean-ups.
observer_->OnRunning();
return true;
}
bool QuicServer::Stop() {
if (state_ != State::kRunning && state_ != State::kSuspended)
return false;
connection_factory_->SetServerDelegate(nullptr, {});
CloseAllConnections();
state_ = State::kStopped;
Cleanup(); // Final clean-up.
observer_->OnStopped();
return true;
}
bool QuicServer::Suspend() {
// TODO(btolsch): QuicStreams should either buffer or reject writes.
if (state_ != State::kRunning)
return false;
state_ = State::kSuspended;
observer_->OnSuspended();
return true;
}
bool QuicServer::Resume() {
if (state_ != State::kSuspended)
return false;
state_ = State::kRunning;
observer_->OnRunning();
return true;
}
void QuicServer::Cleanup() {
for (auto& entry : connections_)
entry.second.delegate->DestroyClosedStreams();
for (uint64_t endpoint_id : delete_connections_) {
auto it = connections_.find(endpoint_id);
if (it != connections_.end()) {
connections_.erase(it);
}
}
delete_connections_.clear();
constexpr Clock::duration kQuicCleanupPeriod = std::chrono::milliseconds(500);
if (state_ != State::kStopped) {
cleanup_alarm_.ScheduleFromNow([this] { Cleanup(); }, kQuicCleanupPeriod);
}
}
std::unique_ptr<ProtocolConnection> QuicServer::CreateProtocolConnection(
uint64_t endpoint_id) {
if (state_ != State::kRunning) {
return nullptr;
}
auto connection_entry = connections_.find(endpoint_id);
if (connection_entry == connections_.end()) {
return nullptr;
}
return QuicProtocolConnection::FromExisting(
this, connection_entry->second.connection.get(),
connection_entry->second.delegate.get(), endpoint_id);
}
void QuicServer::OnConnectionDestroyed(QuicProtocolConnection* connection) {
if (!connection->stream())
return;
auto connection_entry = connections_.find(connection->endpoint_id());
if (connection_entry == connections_.end())
return;
connection_entry->second.delegate->DropProtocolConnection(connection);
}
uint64_t QuicServer::OnCryptoHandshakeComplete(
ServiceConnectionDelegate* delegate,
uint64_t connection_id) {
OSP_DCHECK_EQ(state_, State::kRunning);
const IPEndpoint& endpoint = delegate->endpoint();
auto pending_entry = pending_connections_.find(endpoint);
if (pending_entry == pending_connections_.end())
return 0;
ServiceConnectionData connection_data = std::move(pending_entry->second);
pending_connections_.erase(pending_entry);
uint64_t endpoint_id = next_endpoint_id_++;
endpoint_map_[endpoint] = endpoint_id;
connections_.emplace(endpoint_id, std::move(connection_data));
return endpoint_id;
}
void QuicServer::OnIncomingStream(
std::unique_ptr<QuicProtocolConnection> connection) {
OSP_DCHECK_EQ(state_, State::kRunning);
observer_->OnIncomingConnection(std::move(connection));
}
void QuicServer::OnConnectionClosed(uint64_t endpoint_id,
uint64_t connection_id) {
OSP_DCHECK_EQ(state_, State::kRunning);
auto connection_entry = connections_.find(endpoint_id);
if (connection_entry == connections_.end())
return;
delete_connections_.push_back(endpoint_id);
// TODO(crbug.com/openscreen/42): If we reset request IDs when a connection is
// closed, we might end up re-using request IDs when a new connection is
// created to the same endpoint.
endpoint_request_ids_.ResetRequestId(endpoint_id);
}
void QuicServer::OnDataReceived(uint64_t endpoint_id,
uint64_t connection_id,
const uint8_t* data,
size_t data_size) {
OSP_DCHECK_EQ(state_, State::kRunning);
demuxer_->OnStreamData(endpoint_id, connection_id, data, data_size);
}
void QuicServer::CloseAllConnections() {
for (auto& conn : pending_connections_)
conn.second.connection->Close();
pending_connections_.clear();
for (auto& conn : connections_)
conn.second.connection->Close();
connections_.clear();
endpoint_map_.clear();
next_endpoint_id_ = 0;
endpoint_request_ids_.Reset();
}
QuicConnection::Delegate* QuicServer::NextConnectionDelegate(
const IPEndpoint& source) {
OSP_DCHECK_EQ(state_, State::kRunning);
OSP_DCHECK(!pending_connection_delegate_);
pending_connection_delegate_ =
std::make_unique<ServiceConnectionDelegate>(this, source);
return pending_connection_delegate_.get();
}
void QuicServer::OnIncomingConnection(
std::unique_ptr<QuicConnection> connection) {
OSP_DCHECK_EQ(state_, State::kRunning);
const IPEndpoint& endpoint = pending_connection_delegate_->endpoint();
pending_connections_.emplace(
endpoint, ServiceConnectionData(std::move(connection),
std::move(pending_connection_delegate_)));
}
} // namespace osp
} // namespace openscreen
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