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// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Adapted from udp_socket_libevent.h
#ifndef NET_SOCKET_UDP_SOCKET_STARBOARD_H_
#define NET_SOCKET_UDP_SOCKET_STARBOARD_H_
#include "base/memory/ref_counted.h"
#include "base/message_loop/message_loop.h"
#include "base/timer/timer.h"
#include "net/base/completion_once_callback.h"
#include "net/base/datagram_buffer.h"
#include "net/base/io_buffer.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_errors.h"
#include "net/base/net_export.h"
#include "net/base/network_change_notifier.h"
#include "net/base/rand_callback.h"
#include "net/log/net_log.h"
#include "net/log/net_log_with_source.h"
#include "net/socket/datagram_socket.h"
#include "net/socket/diff_serv_code_point.h"
#include "net/socket/socket_descriptor.h"
#include "net/socket/socket_tag.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
#include "starboard/common/socket.h"
namespace net {
// Sendresult is inspired by sendmmsg, but unlike sendmmsg it is not
// convenient to require that a positive |write_count| and a negative
// error code are mutually exclusive.
struct NET_EXPORT SendResult {
explicit SendResult();
~SendResult();
SendResult(int rv, int write_count, DatagramBuffers buffers);
SendResult(SendResult& other) = delete;
SendResult& operator=(SendResult& other) = delete;
SendResult(SendResult&& other);
SendResult& operator=(SendResult&& other) = default;
int rv;
// number of successful writes.
int write_count;
DatagramBuffers buffers;
};
// Don't delay writes more than this.
const base::TimeDelta kWriteAsyncMsThreshold =
base::TimeDelta::FromMilliseconds(1);
// Prefer local if number of writes is not more than this.
const int kWriteAsyncMinBuffersThreshold = 2;
// Don't allow more than this many outstanding async writes.
const int kWriteAsyncMaxBuffersThreshold = 16;
// PostTask immediately when unwritten buffers reaches this.
const int kWriteAsyncPostBuffersThreshold = kWriteAsyncMaxBuffersThreshold / 2;
// Don't unblock writer unless pending async writes are less than this.
const int kWriteAsyncCallbackBuffersThreshold = kWriteAsyncMaxBuffersThreshold;
// To allow mock |Send|/|Sendmsg| in testing. This has to be
// reference counted thread safe because |SendBuffers| may be invoked in
// another thread via PostTask*.
class NET_EXPORT UDPSocketStarboardSender
: public base::RefCountedThreadSafe<UDPSocketStarboardSender> {
public:
explicit UDPSocketStarboardSender();
SendResult SendBuffers(const SbSocket& socket,
DatagramBuffers buffers,
SbSocketAddress address);
protected:
friend class base::RefCountedThreadSafe<UDPSocketStarboardSender>;
virtual ~UDPSocketStarboardSender();
virtual int Send(const SbSocket& socket,
const char* buf,
size_t len,
SbSocketAddress address) const;
SendResult InternalSendBuffers(const SbSocket& socket,
DatagramBuffers buffers,
SbSocketAddress address) const;
private:
UDPSocketStarboardSender(const UDPSocketStarboardSender&) = delete;
UDPSocketStarboardSender& operator=(const UDPSocketStarboardSender&) = delete;
};
class NET_EXPORT UDPSocketStarboard
: public base::MessageLoopCurrentForIO::Watcher {
public:
UDPSocketStarboard(DatagramSocket::BindType bind_type,
net::NetLog* net_log,
const net::NetLogSource& source);
virtual ~UDPSocketStarboard();
// Opens the socket.
// Returns a net error code.
int Open(AddressFamily address_family);
// Binds this socket to |network|. All data traffic on the socket will be sent
// and received via |network|. Must be called before Connect(). This call will
// fail if |network| has disconnected. Communication using this socket will
// fail if |network| disconnects.
// Returns a net error code.
int BindToNetwork(NetworkChangeNotifier::NetworkHandle network);
// Connect the socket to the host at |address|.
// Should be called after Open().
// Returns a net error code.
int Connect(const IPEndPoint& address);
// Bind the address/port for this socket to |address|. This is generally
// only used on a server. Should be called after Open().
// Returns a net error code.
int Bind(const IPEndPoint& address);
// Close the socket.
void Close();
// Copy the remote udp address into |address| and return a network error code.
int GetPeerAddress(IPEndPoint* address) const;
// Copy the local udp address into |address| and return a network error code.
// (similar to getsockname)
int GetLocalAddress(IPEndPoint* address) const;
// IO:
// Multiple outstanding read requests are not supported.
// Full duplex mode (reading and writing at the same time) is supported
// Reads from the socket.
// Only usable from the client-side of a UDP socket, after the socket
// has been connected.
int Read(IOBuffer* buf, int buf_len, CompletionOnceCallback callback);
// Writes to the socket.
// Only usable from the client-side of a UDP socket, after the socket
// has been connected.
int Write(IOBuffer* buf,
int buf_len,
CompletionOnceCallback callback,
const NetworkTrafficAnnotationTag& traffic_annotation);
// Refer to datagram_client_socket.h
int WriteAsync(DatagramBuffers buffers,
CompletionOnceCallback callback,
const NetworkTrafficAnnotationTag& traffic_annotation);
int WriteAsync(const char* buffer,
size_t buf_len,
CompletionOnceCallback callback,
const NetworkTrafficAnnotationTag& traffic_annotation);
DatagramBuffers GetUnwrittenBuffers();
// Reads from a socket and receive sender address information.
// |buf| is the buffer to read data into.
// |buf_len| is the maximum amount of data to read.
// |address| is a buffer provided by the caller for receiving the sender
// address information about the received data. This buffer must be kept
// alive by the caller until the callback is placed.
// |callback| is the callback on completion of the RecvFrom.
// Returns a net error code, or ERR_IO_PENDING if the IO is in progress.
// If ERR_IO_PENDING is returned, the caller must keep |buf| and |address|
// alive until the callback is called.
int RecvFrom(IOBuffer* buf,
int buf_len,
IPEndPoint* address,
CompletionOnceCallback callback);
// Sends to a socket with a particular destination.
// |buf| is the buffer to send.
// |buf_len| is the number of bytes to send.
// |address| is the recipient address.
// |callback| is the user callback function to call on complete.
// Returns a net error code, or ERR_IO_PENDING if the IO is in progress.
// If ERR_IO_PENDING is returned, the caller must keep |buf| and |address|
// alive until the callback is called.
int SendTo(IOBuffer* buf,
int buf_len,
const IPEndPoint& address,
CompletionOnceCallback callback);
// Sets the receive buffer size (in bytes) for the socket.
// Returns a net error code.
int SetReceiveBufferSize(int32_t size);
// Sets the send buffer size (in bytes) for the socket.
// Returns a net error code.
int SetSendBufferSize(int32_t size);
// Requests that packets sent by this socket not be fragment, either locally
// by the host, or by routers (via the DF bit in the IPv4 packet header).
// May not be supported by all platforms. Returns a return a network error
// code if there was a problem, but the socket will still be usable. Can not
// return ERR_IO_PENDING.
int SetDoNotFragment();
// If |confirm| is true, then the MSG_CONFIRM flag will be passed to
// subsequent writes if it's supported by the platform.
void SetMsgConfirm(bool confirm);
// Returns true if the socket is already connected or bound.
bool is_connected() const { return is_connected_; }
const NetLogWithSource& NetLog() const { return net_log_; }
// Call this to enable SO_REUSEADDR on the underlying socket.
// Should be called between Open() and Bind().
// Returns a net error code.
int AllowAddressReuse();
// Call this to allow or disallow sending and receiving packets to and from
// broadcast addresses.
// Returns a net error code.
int SetBroadcast(bool broadcast);
// Joins the multicast group.
// |group_address| is the group address to join, could be either
// an IPv4 or IPv6 address.
// Returns a net error code.
int JoinGroup(const IPAddress& group_address) const;
// Leaves the multicast group.
// |group_address| is the group address to leave, could be either
// an IPv4 or IPv6 address. If the socket hasn't joined the group,
// it will be ignored.
// It's optional to leave the multicast group before destroying
// the socket. It will be done by the OS.
// Returns a net error code.
int LeaveGroup(const IPAddress& group_address) const;
// Sets interface to use for multicast. If |interface_index| set to 0,
// default interface is used.
// Should be called before Bind().
// Returns a net error code.
int SetMulticastInterface(uint32_t interface_index);
// Sets the time-to-live option for UDP packets sent to the multicast
// group address. The default value of this option is 1.
// Cannot be negative or more than 255.
// Should be called before Bind().
// Returns a net error code.
int SetMulticastTimeToLive(int time_to_live);
// Sets the loopback flag for UDP socket. If this flag is true, the host
// will receive packets sent to the joined group from itself.
// The default value of this option is true.
// Should be called before Bind().
// Returns a net error code.
//
// Note: the behavior of |SetMulticastLoopbackMode| is slightly
// different between Windows and Unix-like systems. The inconsistency only
// happens when there are more than one applications on the same host
// joined to the same multicast group while having different settings on
// multicast loopback mode. On Windows, the applications with loopback off
// will not RECEIVE the loopback packets; while on Unix-like systems, the
// applications with loopback off will not SEND the loopback packets to
// other applications on the same host. See MSDN: http://goo.gl/6vqbj
int SetMulticastLoopbackMode(bool loopback);
// Sets the differentiated services flags on outgoing packets. May not
// do anything on some platforms.
// Returns a net error code.
int SetDiffServCodePoint(DiffServCodePoint dscp);
// Resets the thread to be used for thread-safety checks.
void DetachFromThread();
// Apply |tag| to this socket.
void ApplySocketTag(const SocketTag& tag);
void SetWriteAsyncEnabled(bool enabled) { write_async_enabled_ = enabled; }
bool WriteAsyncEnabled() { return write_async_enabled_; }
void SetMaxPacketSize(size_t max_packet_size);
void SetWriteMultiCoreEnabled(bool enabled) {
write_multi_core_enabled_ = enabled;
}
void SetWriteBatchingActive(bool active) { write_batching_active_ = active; }
void SetWriteAsyncMaxBuffers(int value) {
LOG(INFO) << "SetWriteAsyncMaxBuffers: " << value;
write_async_max_buffers_ = value;
}
// Enables experimental optimization. This method should be called
// before the socket is used to read data for the first time.
void enable_experimental_recv_optimization() {
DCHECK(SbSocketIsValid(socket_));
experimental_recv_optimization_enabled_ = true;
};
protected:
// Watcher for WriteAsync paths.
class WriteAsyncWatcher : public base::MessageLoopCurrentForIO::Watcher {
public:
explicit WriteAsyncWatcher(UDPSocketStarboard* socket)
: socket_(socket), watching_(false) {}
// MessageLoopCurrentForIO::Watcher methods
void OnSocketReadyToRead(SbSocket socket) override{};
void OnSocketReadyToWrite(SbSocket socket) override;
void set_watching(bool watching) { watching_ = watching; }
bool watching() { return watching_; }
private:
UDPSocketStarboard* const socket_;
bool watching_;
DISALLOW_COPY_AND_ASSIGN(WriteAsyncWatcher);
};
void IncreaseWriteAsyncOutstanding(int increment) {
write_async_outstanding_ += increment;
}
virtual bool InternalWatchSocket();
virtual void InternalStopWatchingSocket();
void SetWriteCallback(CompletionOnceCallback callback) {
write_callback_ = std::move(callback);
}
void DidSendBuffers(SendResult buffers);
void FlushPending();
std::unique_ptr<WriteAsyncWatcher> write_async_watcher_;
scoped_refptr<UDPSocketStarboardSender> sender_;
std::unique_ptr<DatagramBufferPool> datagram_buffer_pool_;
// |WriteAsync| pending writes, does not include buffers that have
// been |PostTask*|'d.
DatagramBuffers pending_writes_;
private:
// MessageLoopCurrentForIO::Watcher implementation.
void OnSocketReadyToRead(SbSocket socket) override;
void OnSocketReadyToWrite(SbSocket socket) override;
int InternalWriteAsync(CompletionOnceCallback callback,
const NetworkTrafficAnnotationTag& traffic_annotation);
bool WatchSocket();
void StopWatchingSocket();
void DoReadCallback(int rv);
void DoWriteCallback(int rv);
void DidCompleteRead();
void DidCompleteWrite();
// Handles stats and logging. |result| is the number of bytes transferred, on
// success, or the net error code on failure. On success, LogRead takes in a
// sockaddr and its length, which are mandatory, while LogWrite takes in an
// optional IPEndPoint.
void LogRead(int result, const char* bytes, const IPEndPoint* address) const;
void LogWrite(int result, const char* bytes, const IPEndPoint* address) const;
// Same as SendTo(), except that address is passed by pointer
// instead of by reference. It is called from Write() with |address|
// set to NULL.
int SendToOrWrite(IOBuffer* buf,
int buf_len,
const IPEndPoint* address,
CompletionOnceCallback callback);
int InternalConnect(const IPEndPoint& address);
// Reads data from a UDP socket, if address is not nullptr, the sender's
// address will be copied to |*address|.
int InternalRecvFrom(IOBuffer* buf, int buf_len, IPEndPoint* address);
int InternalSendTo(IOBuffer* buf, int buf_len, const IPEndPoint* address);
// Applies |socket_options_| to |socket_|. Should be called before
// Bind().
int DoBind(const IPEndPoint& address);
int RandomBind(const IPAddress& address);
// Helpers for |WriteAsync|
base::SequencedTaskRunner* GetTaskRunner();
void OnWriteAsyncTimerFired();
void LocalSendBuffers();
void PostSendBuffers();
int ResetLastAsyncResult();
int ResetWrittenBytes();
SbSocket socket_;
bool is_connected_ = false;
SbSocketAddressType address_type_;
// Bitwise-or'd combination of SocketOptions. Specifies the set of
// options that should be applied to |socket_| before Bind().
int socket_options_;
// How to do source port binding, used only when UDPSocket is part of
// UDPClientSocket, since UDPServerSocket provides Bind.
DatagramSocket::BindType bind_type_;
// These are mutable since they're just cached copies to make
// GetPeerAddress/GetLocalAddress smarter.
mutable std::unique_ptr<IPEndPoint> local_address_;
mutable std::unique_ptr<IPEndPoint> remote_address_;
// The socket's SbSocketWaiter wrappers
base::MessageLoopCurrentForIO::SocketWatcher socket_watcher_;
// Various bits to support |WriteAsync()|.
bool write_async_enabled_ = false;
bool write_batching_active_ = false;
bool write_multi_core_enabled_ = false;
int write_async_max_buffers_ = 16;
int written_bytes_ = 0;
int last_async_result_;
base::RepeatingTimer write_async_timer_;
bool write_async_timer_running_;
// Total writes in flight, including those |PostTask*|'d.
int write_async_outstanding_;
scoped_refptr<base::SequencedTaskRunner> task_runner_;
// The buffer used by InternalRead() to retry Read requests
IOBuffer* read_buf_;
int read_buf_len_;
IPEndPoint* recv_from_address_;
// The buffer used by InternalWrite() to retry Write requests
IOBuffer* write_buf_;
int write_buf_len_;
std::unique_ptr<IPEndPoint> send_to_address_;
// External callback; called when read is complete.
CompletionOnceCallback read_callback_;
// External callback; called when write is complete.
CompletionOnceCallback write_callback_;
NetLogWithSource net_log_;
// If set to true, the socket will use an optimized experimental code path.
// By default, the value is set to false. To use the optimization, the
// client of the socket has to opt-in by calling the
// enable_experimental_recv_optimization() method.
bool experimental_recv_optimization_enabled_ = false;
THREAD_CHECKER(thread_checker_);
// Used for alternate writes that are posted for concurrent execution.
base::WeakPtrFactory<UDPSocketStarboard> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(UDPSocketStarboard);
};
} // namespace net
#endif // NET_SOCKET_UDP_SOCKET_STARBOARD_H_