godot/core/io/stream_peer_socket.cpp

/**************************************************************************/
/*  stream_peer_socket.cpp                                                */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
/* Permission is hereby granted, free of charge, to any person obtaining  */
/* a copy of this software and associated documentation files (the        */
/* "Software"), to deal in the Software without restriction, including    */
/* without limitation the rights to use, copy, modify, merge, publish,    */
/* distribute, sublicense, and/or sell copies of the Software, and to     */
/* permit persons to whom the Software is furnished to do so, subject to  */
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/* The above copyright notice and this permission notice shall be         */
/* included in all copies or substantial portions of the Software.        */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
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#include "stream_peer_socket.h"
#include "stream_peer_socket.compat.inc"

Error StreamPeerSocket::poll() {
	if (status == STATUS_CONNECTED) {
		Error err;
		err = _sock->poll(NetSocket::POLL_TYPE_IN, 0);
		if (err == OK) {
			// FIN received
			if (_sock->get_available_bytes() == 0) {
				disconnect_from_host();
				return OK;
			}
		}
		// Also poll write
		err = _sock->poll(NetSocket::POLL_TYPE_IN_OUT, 0);
		if (err != OK && err != ERR_BUSY) {
			// Got an error
			disconnect_from_host();
			status = STATUS_ERROR;
			return err;
		}
		return OK;
	} else if (status != STATUS_CONNECTING) {
		return OK;
	}

	Error err = _sock->connect_to_host(peer_address);

	if (err == OK) {
		status = STATUS_CONNECTED;
		return OK;
	} else if (err == ERR_BUSY) {
		// Check for connect timeout
		if (OS::get_singleton()->get_ticks_msec() > timeout) {
			disconnect_from_host();
			status = STATUS_ERROR;
			return ERR_CONNECTION_ERROR;
		}
		// Still trying to connect
		return OK;
	}

	disconnect_from_host();
	status = STATUS_ERROR;
	return ERR_CONNECTION_ERROR;
}

Error StreamPeerSocket::write(const uint8_t *p_data, int p_bytes, int &r_sent, bool p_block) {
	ERR_FAIL_COND_V(_sock.is_null(), ERR_UNAVAILABLE);

	if (status != STATUS_CONNECTED) {
		return FAILED;
	}

	Error err;
	int data_to_send = p_bytes;
	const uint8_t *offset = p_data;
	int total_sent = 0;

	while (data_to_send) {
		int sent_amount = 0;
		err = _sock->send(offset, data_to_send, sent_amount);

		if (err != OK) {
			if (err != ERR_BUSY) {
				disconnect_from_host();
				return FAILED;
			}

			if (!p_block) {
				r_sent = total_sent;
				return OK;
			}

			// Block and wait for the socket to accept more data
			err = _sock->poll(NetSocket::POLL_TYPE_OUT, -1);
			if (err != OK) {
				disconnect_from_host();
				return FAILED;
			}
		} else {
			data_to_send -= sent_amount;
			offset += sent_amount;
			total_sent += sent_amount;
		}
	}

	r_sent = total_sent;

	return OK;
}

Error StreamPeerSocket::read(uint8_t *p_buffer, int p_bytes, int &r_received, bool p_block) {
	if (status != STATUS_CONNECTED) {
		return FAILED;
	}

	Error err;
	int to_read = p_bytes;
	int total_read = 0;
	r_received = 0;

	while (to_read) {
		int read = 0;
		err = _sock->recv(p_buffer + total_read, to_read, read);

		if (err != OK) {
			if (err != ERR_BUSY) {
				disconnect_from_host();
				return FAILED;
			}

			if (!p_block) {
				r_received = total_read;
				return OK;
			}

			err = _sock->poll(NetSocket::POLL_TYPE_IN, -1);

			if (err != OK) {
				disconnect_from_host();
				return FAILED;
			}

		} else if (read == 0) {
			disconnect_from_host();
			r_received = total_read;
			return ERR_FILE_EOF;

		} else {
			to_read -= read;
			total_read += read;

			if (!p_block) {
				r_received = total_read;
				return OK;
			}
		}
	}

	r_received = total_read;

	return OK;
}

StreamPeerSocket::Status StreamPeerSocket::get_status() const {
	return status;
}

void StreamPeerSocket::disconnect_from_host() {
	if (_sock.is_valid() && _sock->is_open()) {
		_sock->close();
	}

	timeout = 0;
	status = STATUS_NONE;
	peer_address = NetSocket::Address();
}

Error StreamPeerSocket::wait(NetSocket::PollType p_type, int p_timeout) {
	ERR_FAIL_COND_V(_sock.is_null() || !_sock->is_open(), ERR_UNAVAILABLE);
	return _sock->poll(p_type, p_timeout);
}

Error StreamPeerSocket::put_data(const uint8_t *p_data, int p_bytes) {
	int total;
	return write(p_data, p_bytes, total, true);
}

Error StreamPeerSocket::put_partial_data(const uint8_t *p_data, int p_bytes, int &r_sent) {
	return write(p_data, p_bytes, r_sent, false);
}

Error StreamPeerSocket::get_data(uint8_t *p_buffer, int p_bytes) {
	int total;
	return read(p_buffer, p_bytes, total, true);
}

Error StreamPeerSocket::get_partial_data(uint8_t *p_buffer, int p_bytes, int &r_received) {
	return read(p_buffer, p_bytes, r_received, false);
}

int StreamPeerSocket::get_available_bytes() const {
	ERR_FAIL_COND_V(_sock.is_null(), -1);
	return _sock->get_available_bytes();
}

void StreamPeerSocket::_bind_methods() {
	ClassDB::bind_method(D_METHOD("poll"), &StreamPeerSocket::poll);
	ClassDB::bind_method(D_METHOD("get_status"), &StreamPeerSocket::get_status);
	ClassDB::bind_method(D_METHOD("disconnect_from_host"), &StreamPeerSocket::disconnect_from_host);

	BIND_ENUM_CONSTANT(STATUS_NONE);
	BIND_ENUM_CONSTANT(STATUS_CONNECTING);
	BIND_ENUM_CONSTANT(STATUS_CONNECTED);
	BIND_ENUM_CONSTANT(STATUS_ERROR);
}

StreamPeerSocket::StreamPeerSocket() :
		_sock(NetSocket::create()) {
}

StreamPeerSocket::~StreamPeerSocket() {
	disconnect_from_host();
}