/*-
 *   BSD LICENSE
 *
 *   Copyright (c) Intel Corporation.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Intel Corporation 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
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "spdk/stdinc.h"
#include "spdk/util.h"

#include "spdk_cunit.h"

#include "sock/sock.c"
#include "sock/posix/posix.c"

#define UT_IP	"test_ip"
#define UT_PORT	1234

bool g_read_data_called;
ssize_t g_bytes_read;
char g_buf[256];
struct spdk_sock *g_server_sock_read;
int g_ut_accept_count;
struct spdk_ut_sock *g_ut_listen_sock;
struct spdk_ut_sock *g_ut_client_sock;

struct spdk_ut_sock {
	struct spdk_sock	base;
	struct spdk_ut_sock	*peer;
	size_t			bytes_avail;
	char			buf[256];
};

struct spdk_ut_sock_group_impl {
	struct spdk_sock_group_impl	base;
	struct spdk_ut_sock		*sock;
};

#define __ut_sock(sock) (struct spdk_ut_sock *)sock
#define __ut_group(group) (struct spdk_ut_sock_group_impl *)group

static int
spdk_ut_sock_getaddr(struct spdk_sock *_sock, char *saddr, int slen, uint16_t *sport,
		     char *caddr, int clen, uint16_t *cport)
{
	return 0;
}

static struct spdk_sock *
spdk_ut_sock_listen(const char *ip, int port)
{
	struct spdk_ut_sock *sock;

	if (strcmp(ip, UT_IP) || port != UT_PORT) {
		return NULL;
	}

	CU_ASSERT(g_ut_listen_sock == NULL);

	sock = calloc(1, sizeof(*sock));
	SPDK_CU_ASSERT_FATAL(sock != NULL);
	g_ut_listen_sock = sock;

	return &sock->base;
}

static struct spdk_sock *
spdk_ut_sock_connect(const char *ip, int port)
{
	struct spdk_ut_sock *sock;

	if (strcmp(ip, UT_IP) || port != UT_PORT) {
		return NULL;
	}

	sock = calloc(1, sizeof(*sock));
	SPDK_CU_ASSERT_FATAL(sock != NULL);
	g_ut_accept_count++;
	CU_ASSERT(g_ut_client_sock == NULL);
	g_ut_client_sock = sock;

	return &sock->base;
}

static struct spdk_sock *
spdk_ut_sock_accept(struct spdk_sock *_sock)
{
	struct spdk_ut_sock *sock = __ut_sock(_sock);
	struct spdk_ut_sock *new_sock;

	CU_ASSERT(sock == g_ut_listen_sock);

	if (g_ut_accept_count == 0) {
		errno = EAGAIN;
		return NULL;
	}

	g_ut_accept_count--;
	new_sock = calloc(1, sizeof(*sock));
	if (new_sock == NULL) {
		SPDK_ERRLOG("sock allocation failed\n");
		return NULL;
	}

	SPDK_CU_ASSERT_FATAL(g_ut_client_sock != NULL);
	g_ut_client_sock->peer = new_sock;

	return &new_sock->base;
}

static int
spdk_ut_sock_close(struct spdk_sock *_sock)
{
	struct spdk_ut_sock *sock = __ut_sock(_sock);

	if (sock == g_ut_listen_sock) {
		g_ut_listen_sock = NULL;
	}
	if (sock == g_ut_client_sock) {
		g_ut_client_sock = NULL;
	}
	free(_sock);

	return 0;
}

static ssize_t
spdk_ut_sock_recv(struct spdk_sock *_sock, void *buf, size_t len)
{
	struct spdk_ut_sock *sock = __ut_sock(_sock);
	char tmp[256];

	len = spdk_min(len, sock->bytes_avail);

	if (len == 0) {
		errno = EAGAIN;
		return -1;
	}

	memcpy(buf, sock->buf, len);
	memcpy(tmp, &sock->buf[len], sock->bytes_avail - len);
	memcpy(sock->buf, tmp, sock->bytes_avail - len);
	sock->bytes_avail -= len;

	return len;
}

static ssize_t
spdk_ut_sock_readv(struct spdk_sock *_sock, struct iovec *iov, int iovcnt)
{
	struct spdk_ut_sock *sock = __ut_sock(_sock);
	size_t len;
	char tmp[256];

	/* Test implementation only supports single iov for now. */
	CU_ASSERT(iovcnt == 1);

	len = spdk_min(iov[0].iov_len, sock->bytes_avail);

	if (len == 0) {
		errno = EAGAIN;
		return -1;
	}

	memcpy(iov[0].iov_base, sock->buf, len);
	memcpy(tmp, &sock->buf[len], sock->bytes_avail - len);
	memcpy(sock->buf, tmp, sock->bytes_avail - len);
	sock->bytes_avail -= len;

	return len;
}

static ssize_t
spdk_ut_sock_writev(struct spdk_sock *_sock, struct iovec *iov, int iovcnt)
{
	struct spdk_ut_sock *sock = __ut_sock(_sock);
	struct spdk_ut_sock *peer;

	SPDK_CU_ASSERT_FATAL(sock->peer != NULL);
	peer = sock->peer;

	/* Test implementation only supports single iov for now. */
	CU_ASSERT(iovcnt == 1);

	memcpy(&peer->buf[peer->bytes_avail], iov[0].iov_base, iov[0].iov_len);
	peer->bytes_avail += iov[0].iov_len;

	return iov[0].iov_len;
}

static int
spdk_ut_sock_set_recvlowat(struct spdk_sock *_sock, int nbytes)
{
	return 0;
}

static int
spdk_ut_sock_set_recvbuf(struct spdk_sock *_sock, int sz)
{
	return 0;
}

static int
spdk_ut_sock_set_sendbuf(struct spdk_sock *_sock, int sz)
{
	return 0;
}

static bool
spdk_ut_sock_is_ipv6(struct spdk_sock *_sock)
{
	return false;
}

static bool
spdk_ut_sock_is_ipv4(struct spdk_sock *_sock)
{
	return true;
}

static struct spdk_sock_group_impl *
spdk_ut_sock_group_impl_create(void)
{
	struct spdk_ut_sock_group_impl *group_impl;

	group_impl = calloc(1, sizeof(*group_impl));
	SPDK_CU_ASSERT_FATAL(group_impl != NULL);

	return &group_impl->base;
}

static int
spdk_ut_sock_group_impl_add_sock(struct spdk_sock_group_impl *_group, struct spdk_sock *_sock)
{
	struct spdk_ut_sock_group_impl *group = __ut_group(_group);
	struct spdk_ut_sock *sock = __ut_sock(_sock);

	group->sock = sock;

	return 0;
}

static int
spdk_ut_sock_group_impl_remove_sock(struct spdk_sock_group_impl *_group, struct spdk_sock *_sock)
{
	struct spdk_ut_sock_group_impl *group = __ut_group(_group);
	struct spdk_ut_sock *sock = __ut_sock(_sock);

	CU_ASSERT(group->sock == sock);
	group->sock = NULL;

	return 0;
}

static int
spdk_ut_sock_group_impl_poll(struct spdk_sock_group_impl *_group, int max_events,
			     struct spdk_sock **socks)
{
	struct spdk_ut_sock_group_impl *group = __ut_group(_group);

	if (group->sock != NULL && group->sock->bytes_avail > 0) {
		socks[0] = &group->sock->base;
		return 1;
	}

	return 0;
}

static int
spdk_ut_sock_group_impl_close(struct spdk_sock_group_impl *_group)
{
	struct spdk_ut_sock_group_impl *group = __ut_group(_group);

	CU_ASSERT(group->sock == NULL);

	return 0;
}

static struct spdk_net_impl g_ut_net_impl = {
	.name		= "ut",
	.getaddr	= spdk_ut_sock_getaddr,
	.connect	= spdk_ut_sock_connect,
	.listen		= spdk_ut_sock_listen,
	.accept		= spdk_ut_sock_accept,
	.close		= spdk_ut_sock_close,
	.recv		= spdk_ut_sock_recv,
	.readv		= spdk_ut_sock_readv,
	.writev		= spdk_ut_sock_writev,
	.set_recvlowat	= spdk_ut_sock_set_recvlowat,
	.set_recvbuf	= spdk_ut_sock_set_recvbuf,
	.set_sendbuf	= spdk_ut_sock_set_sendbuf,
	.is_ipv6	= spdk_ut_sock_is_ipv6,
	.is_ipv4	= spdk_ut_sock_is_ipv4,
	.group_impl_create	= spdk_ut_sock_group_impl_create,
	.group_impl_add_sock	= spdk_ut_sock_group_impl_add_sock,
	.group_impl_remove_sock = spdk_ut_sock_group_impl_remove_sock,
	.group_impl_poll	= spdk_ut_sock_group_impl_poll,
	.group_impl_close	= spdk_ut_sock_group_impl_close,
};

SPDK_NET_IMPL_REGISTER(ut, &g_ut_net_impl);

static void
_sock(const char *ip, int port)
{
	struct spdk_sock *listen_sock;
	struct spdk_sock *server_sock;
	struct spdk_sock *client_sock;
	char *test_string = "abcdef";
	char buffer[64];
	ssize_t bytes_read, bytes_written;
	struct iovec iov;
	int rc;

	listen_sock = spdk_sock_listen(ip, port);
	SPDK_CU_ASSERT_FATAL(listen_sock != NULL);

	server_sock = spdk_sock_accept(listen_sock);
	CU_ASSERT(server_sock == NULL);
	CU_ASSERT(errno == EAGAIN || errno == EWOULDBLOCK);

	client_sock = spdk_sock_connect(ip, port);
	SPDK_CU_ASSERT_FATAL(client_sock != NULL);

	/*
	 * Delay a bit here before checking if server socket is
	 *  ready.
	 */
	usleep(1000);

	server_sock = spdk_sock_accept(listen_sock);
	SPDK_CU_ASSERT_FATAL(server_sock != NULL);

	/* Test spdk_sock_recv */
	iov.iov_base = test_string;
	iov.iov_len = 7;
	bytes_written = spdk_sock_writev(client_sock, &iov, 1);
	CU_ASSERT(bytes_written == 7);

	usleep(1000);

	bytes_read = spdk_sock_recv(server_sock, buffer, 2);
	CU_ASSERT(bytes_read == 2);

	usleep(1000);

	bytes_read += spdk_sock_recv(server_sock, buffer + 2, 5);
	CU_ASSERT(bytes_read == 7);

	CU_ASSERT(strncmp(test_string, buffer, 7) == 0);

	/* Test spdk_sock_readv */
	iov.iov_base = test_string;
	iov.iov_len = 7;
	bytes_written = spdk_sock_writev(client_sock, &iov, 1);
	CU_ASSERT(bytes_written == 7);

	usleep(1000);

	iov.iov_base = buffer;
	iov.iov_len = 2;
	bytes_read = spdk_sock_readv(server_sock, &iov, 1);
	CU_ASSERT(bytes_read == 2);

	usleep(1000);

	iov.iov_base = buffer + 2;
	iov.iov_len = 5;
	bytes_read += spdk_sock_readv(server_sock, &iov, 1);
	CU_ASSERT(bytes_read == 7);

	usleep(1000);

	CU_ASSERT(strncmp(test_string, buffer, 7) == 0);

	rc = spdk_sock_close(&client_sock);
	CU_ASSERT(client_sock == NULL);
	CU_ASSERT(rc == 0);

	rc = spdk_sock_close(&server_sock);
	CU_ASSERT(server_sock == NULL);
	CU_ASSERT(rc == 0);

	rc = spdk_sock_close(&listen_sock);
	CU_ASSERT(listen_sock == NULL);
	CU_ASSERT(rc == 0);
}

static void
posix_sock(void)
{
	_sock("127.0.0.1", UT_PORT);
}

static void
ut_sock(void)
{
	_sock(UT_IP, UT_PORT);
}

static void
read_data(void *cb_arg, struct spdk_sock_group *group, struct spdk_sock *sock)
{
	struct spdk_sock *server_sock = cb_arg;

	CU_ASSERT(server_sock == sock);

	g_read_data_called = true;
	g_bytes_read += spdk_sock_recv(server_sock, g_buf + g_bytes_read, sizeof(g_buf) - g_bytes_read);
}

static void
_sock_group(const char *ip, int port)
{
	struct spdk_sock_group *group;
	struct spdk_sock *listen_sock;
	struct spdk_sock *server_sock;
	struct spdk_sock *client_sock;
	char *test_string = "abcdef";
	ssize_t bytes_written;
	struct iovec iov;
	int rc;

	listen_sock = spdk_sock_listen(ip, port);
	SPDK_CU_ASSERT_FATAL(listen_sock != NULL);

	server_sock = spdk_sock_accept(listen_sock);
	CU_ASSERT(server_sock == NULL);
	CU_ASSERT(errno == EAGAIN || errno == EWOULDBLOCK);

	client_sock = spdk_sock_connect(ip, port);
	SPDK_CU_ASSERT_FATAL(client_sock != NULL);

	usleep(1000);

	server_sock = spdk_sock_accept(listen_sock);
	SPDK_CU_ASSERT_FATAL(server_sock != NULL);

	group = spdk_sock_group_create();
	SPDK_CU_ASSERT_FATAL(group != NULL);

	/* pass null cb_fn */
	rc = spdk_sock_group_add_sock(group, server_sock, NULL, NULL);
	CU_ASSERT(rc == -1);
	CU_ASSERT(errno == EINVAL);

	rc = spdk_sock_group_add_sock(group, server_sock, read_data, server_sock);
	CU_ASSERT(rc == 0);

	/* try adding sock a second time */
	rc = spdk_sock_group_add_sock(group, server_sock, read_data, server_sock);
	CU_ASSERT(rc == -1);
	CU_ASSERT(errno == EBUSY);

	g_read_data_called = false;
	g_bytes_read = 0;
	rc = spdk_sock_group_poll(group);

	CU_ASSERT(rc == 0);
	CU_ASSERT(g_read_data_called == false);

	iov.iov_base = test_string;
	iov.iov_len = 7;
	bytes_written = spdk_sock_writev(client_sock, &iov, 1);
	CU_ASSERT(bytes_written == 7);

	usleep(1000);

	g_read_data_called = false;
	g_bytes_read = 0;
	rc = spdk_sock_group_poll(group);

	CU_ASSERT(rc == 0);
	CU_ASSERT(g_read_data_called == true);
	CU_ASSERT(g_bytes_read == 7);

	CU_ASSERT(strncmp(test_string, g_buf, 7) == 0);

	rc = spdk_sock_close(&client_sock);
	CU_ASSERT(client_sock == NULL);
	CU_ASSERT(rc == 0);

	/* Try to close sock_group while it still has sockets. */
	rc = spdk_sock_group_close(&group);
	CU_ASSERT(rc == -1);
	CU_ASSERT(errno == EBUSY);

	/* Try to close sock while it is still part of a sock_group. */
	rc = spdk_sock_close(&server_sock);
	CU_ASSERT(rc == -1);
	CU_ASSERT(errno == EBUSY);

	rc = spdk_sock_group_remove_sock(group, server_sock);
	CU_ASSERT(rc == 0);

	rc = spdk_sock_group_close(&group);
	CU_ASSERT(group == NULL);
	CU_ASSERT(rc == 0);

	rc = spdk_sock_close(&server_sock);
	CU_ASSERT(server_sock == NULL);
	CU_ASSERT(rc == 0);

	rc = spdk_sock_close(&listen_sock);
	CU_ASSERT(listen_sock == NULL);
	CU_ASSERT(rc == 0);
}

static void
posix_sock_group(void)
{
	_sock_group("127.0.0.1", UT_PORT);
}

static void
ut_sock_group(void)
{
	_sock_group(UT_IP, UT_PORT);
}

static void
read_data_fairness(void *cb_arg, struct spdk_sock_group *group, struct spdk_sock *sock)
{
	struct spdk_sock *server_sock = cb_arg;
	ssize_t bytes_read;
	char buf[1];

	CU_ASSERT(g_server_sock_read == NULL);
	CU_ASSERT(server_sock == sock);

	g_server_sock_read = server_sock;
	bytes_read = spdk_sock_recv(server_sock, buf, 1);
	CU_ASSERT(bytes_read == 1);
}

static void
posix_sock_group_fairness(void)
{
	struct spdk_sock_group *group;
	struct spdk_sock *listen_sock;
	struct spdk_sock *server_sock[3];
	struct spdk_sock *client_sock[3];
	char test_char = 'a';
	ssize_t bytes_written;
	struct iovec iov;
	int i, rc;

	listen_sock = spdk_sock_listen("127.0.0.1", UT_PORT);
	SPDK_CU_ASSERT_FATAL(listen_sock != NULL);

	group = spdk_sock_group_create();
	SPDK_CU_ASSERT_FATAL(group != NULL);

	for (i = 0; i < 3; i++) {
		client_sock[i] = spdk_sock_connect("127.0.0.1", UT_PORT);
		SPDK_CU_ASSERT_FATAL(client_sock[i] != NULL);

		usleep(1000);

		server_sock[i] = spdk_sock_accept(listen_sock);
		SPDK_CU_ASSERT_FATAL(server_sock[i] != NULL);

		rc = spdk_sock_group_add_sock(group, server_sock[i],
					      read_data_fairness, server_sock[i]);
		CU_ASSERT(rc == 0);
	}

	iov.iov_base = &test_char;
	iov.iov_len = 1;

	for (i = 0; i < 3; i++) {
		bytes_written = spdk_sock_writev(client_sock[i], &iov, 1);
		CU_ASSERT(bytes_written == 1);
	}

	usleep(1000);

	/*
	 * Poll for just one event - this should be server sock 0, since that
	 *  is the peer of the first client sock that we wrote to.
	 */
	g_server_sock_read = NULL;
	rc = spdk_sock_group_poll_count(group, 1);
	CU_ASSERT(rc == 0);
	CU_ASSERT(g_server_sock_read == server_sock[0]);

	/*
	 * Now write another byte to client sock 0.  We want to ensure that
	 *  the sock group does not unfairly process the event for this sock
	 *  before the socks that were written to earlier.
	 */
	bytes_written = spdk_sock_writev(client_sock[0], &iov, 1);
	CU_ASSERT(bytes_written == 1);

	usleep(1000);

	g_server_sock_read = NULL;
	rc = spdk_sock_group_poll_count(group, 1);
	CU_ASSERT(rc == 0);
	CU_ASSERT(g_server_sock_read == server_sock[1]);

	g_server_sock_read = NULL;
	rc = spdk_sock_group_poll_count(group, 1);
	CU_ASSERT(rc == 0);
	CU_ASSERT(g_server_sock_read == server_sock[2]);

	g_server_sock_read = NULL;
	rc = spdk_sock_group_poll_count(group, 1);
	CU_ASSERT(rc == 0);
	CU_ASSERT(g_server_sock_read == server_sock[0]);

	for (i = 0; i < 3; i++) {
		rc = spdk_sock_group_remove_sock(group, server_sock[i]);
		CU_ASSERT(rc == 0);

		rc = spdk_sock_close(&client_sock[i]);
		CU_ASSERT(client_sock[i] == NULL);
		CU_ASSERT(rc == 0);

		rc = spdk_sock_close(&server_sock[i]);
		CU_ASSERT(server_sock[i] == NULL);
		CU_ASSERT(rc == 0);
	}

	rc = spdk_sock_group_close(&group);
	CU_ASSERT(group == NULL);
	CU_ASSERT(rc == 0);

	rc = spdk_sock_close(&listen_sock);
	CU_ASSERT(listen_sock == NULL);
	CU_ASSERT(rc == 0);
}

int
main(int argc, char **argv)
{
	CU_pSuite	suite = NULL;
	unsigned int	num_failures;

	if (CU_initialize_registry() != CUE_SUCCESS) {
		return CU_get_error();
	}

	suite = CU_add_suite("sock", NULL, NULL);
	if (suite == NULL) {
		CU_cleanup_registry();
		return CU_get_error();
	}

	if (
		CU_add_test(suite, "posix_sock", posix_sock) == NULL ||
		CU_add_test(suite, "ut_sock", ut_sock) == NULL ||
		CU_add_test(suite, "posix_sock_group", posix_sock_group) == NULL ||
		CU_add_test(suite, "ut_sock_group", ut_sock_group) == NULL ||
		CU_add_test(suite, "posix_sock_group_fairness", posix_sock_group_fairness) == NULL) {
		CU_cleanup_registry();
		return CU_get_error();
	}

	CU_basic_set_mode(CU_BRM_VERBOSE);

	CU_basic_run_tests();

	num_failures = CU_get_number_of_failures();
	CU_cleanup_registry();

	return num_failures;
}