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/*
* Copyright 2017 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.
*/
#ifndef P2P_BASE_FAKE_PACKET_TRANSPORT_H_
#define P2P_BASE_FAKE_PACKET_TRANSPORT_H_
#include <map>
#include <string>
#include "p2p/base/packet_transport_internal.h"
#include "rtc_base/copy_on_write_buffer.h"
namespace rtc {
// Used to simulate a packet-based transport.
class FakePacketTransport : public PacketTransportInternal {
public:
explicit FakePacketTransport(const std::string& transport_name)
: transport_name_(transport_name) {}
~FakePacketTransport() override {
if (dest_ && dest_->dest_ == this) {
dest_->dest_ = nullptr;
}
}
// SetWritable, SetReceiving and SetDestination are the main methods that can
// be used for testing, to simulate connectivity or lack thereof.
void SetWritable(bool writable) { set_writable(writable); }
void SetReceiving(bool receiving) { set_receiving(receiving); }
// Simulates the two transports connecting to each other.
// If `asymmetric` is true this method only affects this FakePacketTransport.
// If false, it affects `dest` as well.
void SetDestination(FakePacketTransport* dest, bool asymmetric) {
if (dest) {
dest_ = dest;
set_writable(true);
if (!asymmetric) {
dest->SetDestination(this, true);
}
} else {
// Simulates loss of connectivity, by asymmetrically forgetting dest_.
dest_ = nullptr;
set_writable(false);
}
}
// Fake PacketTransportInternal implementation.
const std::string& transport_name() const override { return transport_name_; }
bool writable() const override { return writable_; }
bool receiving() const override { return receiving_; }
int SendPacket(const char* data,
size_t len,
const PacketOptions& options,
int flags) override {
if (!dest_) {
return -1;
}
CopyOnWriteBuffer packet(data, len);
SendPacketInternal(packet);
SentPacket sent_packet(options.packet_id, TimeMillis());
SignalSentPacket(this, sent_packet);
return static_cast<int>(len);
}
int SetOption(Socket::Option opt, int value) override {
options_[opt] = value;
return 0;
}
bool GetOption(Socket::Option opt, int* value) override {
auto it = options_.find(opt);
if (it == options_.end()) {
return false;
}
*value = it->second;
return true;
}
int GetError() override { return error_; }
void SetError(int error) { error_ = error; }
const CopyOnWriteBuffer* last_sent_packet() { return &last_sent_packet_; }
absl::optional<NetworkRoute> network_route() const override {
return network_route_;
}
void SetNetworkRoute(absl::optional<NetworkRoute> network_route) {
network_route_ = network_route;
SignalNetworkRouteChanged(network_route);
}
private:
void set_writable(bool writable) {
if (writable_ == writable) {
return;
}
writable_ = writable;
if (writable_) {
SignalReadyToSend(this);
}
SignalWritableState(this);
}
void set_receiving(bool receiving) {
if (receiving_ == receiving) {
return;
}
receiving_ = receiving;
SignalReceivingState(this);
}
void SendPacketInternal(const CopyOnWriteBuffer& packet) {
last_sent_packet_ = packet;
if (dest_) {
dest_->SignalReadPacket(dest_, packet.data<char>(), packet.size(),
TimeMicros(), 0);
}
}
CopyOnWriteBuffer last_sent_packet_;
std::string transport_name_;
FakePacketTransport* dest_ = nullptr;
bool writable_ = false;
bool receiving_ = false;
std::map<Socket::Option, int> options_;
int error_ = 0;
absl::optional<NetworkRoute> network_route_;
};
} // namespace rtc
#endif // P2P_BASE_FAKE_PACKET_TRANSPORT_H_
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