uhub/src/core/ioqueue.c

/*
 * uhub - A tiny ADC p2p connection hub
 * Copyright (C) 2007-2012, Jan Vidar Krey
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "uhub.h"

#ifdef DEBUG_SENDQ
static void debug_msg(const char* prefix, struct adc_message* msg)
{
	size_t n;
	char* buf = strdup(msg->cache);
	for (n = 0; n < msg->length; n++)
	{
		if (buf[n] == '\r' || buf[n] == '\n')
			buf[n] = '_';
	}
	LOG_TRACE("%s: [%s] (%d bytes)", prefix, buf, (int) msg->length);
	free(buf);
}
#endif

struct ioq_recv* ioq_recv_create()
{
	struct ioq_recv* q = hub_malloc_zero(sizeof(struct ioq_recv));
	return q;
}

void ioq_recv_destroy(struct ioq_recv* q)
{
	if (q)
	{
		hub_free(q->buf);
		hub_free(q);
	}
}

#define IOQ_RECV_FLAGS_PREALLOC 1
#define IOQ_RECV_FLAGS_FULL 2

enum ioq_recv_status ioq_recv_read(struct ioq_recv* q, struct net_connection* con)
{
	static char buf[MAX_RECV_BUF];
	size_t buf_size = ioq_recv_get(q, buf, MAX_RECV_BUF);
	ssize_t size;

	if (buf_size >= MAX_RECV_BUF)
		return ioq_recv_full;

	size = net_con_recv(con, buf + buf_size, MAX_RECV_BUF - buf_size);

	if (size > 0)
		buf_size += size;
	if (size < 0)
		return ioq_recv_error;
	if (size == 0)
		return ioq_recv_later;

	ioq_recv_set(q, buf, buf_size);
	return ioq_recv_ok;
}




size_t ioq_recv_get(struct ioq_recv* q, void* buf, size_t bufsize)
{
	uhub_assert(bufsize >= q->size);
	if (q->size)
	{
		size_t n = q->size;
		memcpy(buf, q->buf, n);
		hub_free(q->buf);
		q->buf = 0;
		q->size = 0;
		return n;
	}
	return 0;
}

size_t ioq_recv_set(struct ioq_recv* q, void* buf, size_t bufsize)
{
	if (q->buf)
	{
		hub_free(q->buf);
		q->buf = 0;
		q->size = 0;
	}
	
	if (!bufsize)
	{
		return 0;
	}

	q->buf = hub_malloc(bufsize);
	if (!q->buf)
		return 0;

	q->size = bufsize;
	memcpy(q->buf, buf, bufsize);
	return bufsize;
}


int ioq_recv_consume(struct ioq_recv* q, size_t bytes)
{
	size_t newsize;
	void* ptr;

	if (!q || bytes > q->size) return 0;

	newsize = (q->size - bytes);
	memmove(q->buf, q->buf + bytes, newsize);
	ptr = hub_realloc(q->buf, newsize);
	q->buf = ptr;
	q->size = newsize;
	return 1;
}

struct ioq_send* ioq_send_create()
{
	struct ioq_send* q = hub_malloc_zero(sizeof(struct ioq_send));
	if (!q)
		return 0;

	q->queue = list_create();
	if (!q->queue)
	{
		hub_free(q);
		return 0;
	}

	return q;
}

static void clear_send_queue_callback(void* ptr)
{
	adc_msg_free((struct adc_message*) ptr);
}

void ioq_send_destroy(struct ioq_send* q)
{
	if (q)
	{
		list_clear(q->queue, &clear_send_queue_callback);
		list_destroy(q->queue);
		hub_free(q);
	}
}

void ioq_send_add(struct ioq_send* q, struct adc_message* msg_)
{
	struct adc_message* msg = adc_msg_incref(msg_);
#ifdef DEBUG_SENDQ
	debug_msg("ioq_send_add", msg);
#endif
	uhub_assert(msg->cache && *msg->cache);
	list_append(q->queue, msg);
	q->size += msg->length;
}

void ioq_send_remove(struct ioq_send* q, struct adc_message* msg)
{
#ifdef DEBUG_SENDQ
	debug_msg("ioq_send_remove", msg);
#endif
	list_remove(q->queue, msg);
	q->size  -= msg->length;
	adc_msg_free(msg);
	q->offset = 0;
}

int ioq_send_send(struct ioq_send* q, struct net_connection* con)
{
	int ret;
	struct adc_message* msg = list_get_first(q->queue);
	if (!msg) return 0;
	uhub_assert(msg->cache && *msg->cache);
	ret = net_con_send(con, msg->cache + q->offset, msg->length - q->offset);

	if (ret > 0)
	{
		q->offset += ret;
		if (msg->length - q->offset > 0)
			return 0;

		ioq_send_remove(q, msg);
		return 1;
	}
	return ret;
}

int ioq_send_is_empty(struct ioq_send* q)
{
	return (q->size - q->offset) == 0;
}

size_t ioq_send_get_bytes(struct ioq_send* q)
{
	return q->size - q->offset;
}