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// Copyright 2021 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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#ifndef SRC_TINT_UTILS_SOCKET_SOCKET_H_
#define SRC_TINT_UTILS_SOCKET_SOCKET_H_
#include <memory>
namespace tint::socket {
/// Socket provides an OS abstraction to a TCP socket.
class Socket {
public:
/// Connects to the given TCP address and port.
/// @param address the target socket address
/// @param port the target socket port
/// @param timeout_ms the timeout for the connection attempt.
/// If timeout_ms is non-zero and no connection was made before timeout_ms milliseconds,
/// then nullptr is returned.
/// @returns the connected Socket, or nullptr on failure
static std::shared_ptr<Socket> Connect(const char* address,
const char* port,
uint32_t timeout_ms);
/// Begins listening for connections on the given TCP address and port.
/// Call Accept() on the returned Socket to block and wait for a connection.
/// @param address the socket address to listen on. Use "localhost" for connections from only
/// this machine, or an empty string to allow connections from any incoming address.
/// @param port the socket port to listen on
/// @returns the Socket that listens for connections
static std::shared_ptr<Socket> Listen(const char* address, const char* port);
/// Destructor
virtual ~Socket();
/// Attempts to read at most `n` bytes into buffer, returning the actual number of bytes read.
/// read() will block until the socket is closed or at least one byte is read.
/// @param buffer the output buffer. Must be at least `n` bytes in size.
/// @param n the maximum number of bytes to read
/// @return the number of bytes read, or 0 if the socket was closed or errored
virtual size_t Read(void* buffer, size_t n) = 0;
/// Writes `n` bytes from buffer into the socket.
/// @param buffer the source data buffer. Must be at least `n` bytes in size.
/// @param n the number of bytes to read from `buffer`
/// @returns true on success, or false if there was an error or the socket was
/// closed.
virtual bool Write(const void* buffer, size_t n) = 0;
/// @returns true if the socket has not been closed.
virtual bool IsOpen() = 0;
/// Closes the socket.
virtual void Close() = 0;
/// Blocks for a connection to be made to the listening port, or for the Socket to be closed.
/// @returns a pointer to the next established incoming connection
virtual std::shared_ptr<Socket> Accept() = 0;
};
} // namespace tint::socket
#endif // SRC_TINT_UTILS_SOCKET_SOCKET_H_