/*-
 * Copyright 2016 Vsevolod Stakhov
 *
 * 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.
 */
#include "config.h"
#include "rspamd.h"
#include "util.h"
#include "libutil/http.h"
#include "libutil/http_private.h"
#include "ottery.h"
#include "cryptobox.h"
#include "unix-std.h"
#include <math.h>
#include <netinet/tcp.h>

#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif

static guint port = 43000;
static gchar *host = "127.0.0.1";
static gchar *server_key = NULL;
static guint cache_size = 10;
static guint nworkers = 1;
static gboolean openssl_mode = FALSE;
static guint file_size = 500;
static guint pconns = 100;
static gdouble test_time = 10.0;
static gchar *latencies_file = NULL;
static gboolean csv_output = FALSE;

/* Dynamic vars */
static rspamd_inet_addr_t *addr;
static guint32 workers_left = 0;
static guint32 *conns_done = NULL;
static const guint store_latencies = 1000;
static guint32 conns_pending = 0;

static GOptionEntry entries[] = {
	{"port", 'p', 0, G_OPTION_ARG_INT, &port,
	 "Port number (default: 43000)", NULL},
	{"cache", 'c', 0, G_OPTION_ARG_INT, &cache_size,
	 "Keys cache size (default: 10)", NULL},
	{"workers", 'n', 0, G_OPTION_ARG_INT, &nworkers,
	 "Number of workers to start (default: 1)", NULL},
	{"size", 's', 0, G_OPTION_ARG_INT, &file_size,
	 "Size of payload to transfer (default: 500)", NULL},
	{"conns", 'C', 0, G_OPTION_ARG_INT, &pconns,
	 "Number of parallel connections (default: 100)", NULL},
	{"time", 't', 0, G_OPTION_ARG_DOUBLE, &test_time,
	 "Time to run tests (default: 10.0 sec)", NULL},
	{"openssl", 'o', 0, G_OPTION_ARG_NONE, &openssl_mode,
	 "Use openssl crypto", NULL},
	{"host", 'h', 0, G_OPTION_ARG_STRING, &host,
	 "Connect to the specified host (default: localhost)", NULL},
	{"key", 'k', 0, G_OPTION_ARG_STRING, &server_key,
	 "Use the specified key (base32 encoded)", NULL},
	{"latency", 'l', 0, G_OPTION_ARG_FILENAME, &latencies_file,
	 "Write latencies to the specified file", NULL},
	{"csv", 0, 0, G_OPTION_ARG_NONE, &csv_output,
	 "Output CSV", NULL},
	{NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL}};

struct lat_elt {
	gdouble lat;
	guchar checked;
};

static struct lat_elt *latencies;

static gint
rspamd_client_body(struct rspamd_http_connection *conn,
				   struct rspamd_http_message *msg,
				   const gchar *chunk, gsize len)
{
	g_assert(chunk[0] == '\0');

	return 0;
}

struct client_cbdata {
	struct lat_elt *lat;
	guint32 *wconns;
	gdouble ts;
	struct ev_loop *ev_base;
};

static void
rspamd_client_err(struct rspamd_http_connection *conn, GError *err)
{
	msg_info("abnormally closing connection from: error: %s",
			 err->message);

	g_assert(0);
	close(conn->fd);
	rspamd_http_connection_unref(conn);
}

static gint
rspamd_client_finish(struct rspamd_http_connection *conn,
					 struct rspamd_http_message *msg)
{
	struct client_cbdata *cb = conn->ud;

	cb->lat->lat = rspamd_get_ticks() - cb->ts;
	cb->lat->checked = TRUE;
	(*cb->wconns)++;
	conns_pending--;
	close(conn->fd);
	rspamd_http_connection_unref(conn);
	g_free(cb);

	if (conns_pending == 0) {
		event_base_loopexit(cb->ev_base, NULL);
	}

	return 0;
}

static void
rspamd_http_client_func(struct ev_loop *ev_base, struct lat_elt *latency,
						guint32 *wconns,
						struct rspamd_cryptobox_pubkey *peer_key,
						struct rspamd_cryptobox_keypair *client_key,
						struct rspamd_keypair_cache *c)
{
	struct rspamd_http_message *msg;
	struct rspamd_http_connection *conn;
	gchar urlbuf[PATH_MAX];
	struct client_cbdata *cb;
	gint fd, flags;

	fd = rspamd_inet_address_connect(addr, SOCK_STREAM, TRUE);
	g_assert(fd != -1);
	flags = 1;
	(void) setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &flags, sizeof(flags));
	conn = rspamd_http_connection_new(rspamd_client_body,
									  rspamd_client_err,
									  rspamd_client_finish,
									  RSPAMD_HTTP_CLIENT_SIMPLE,
									  RSPAMD_HTTP_CLIENT,
									  c,
									  NULL);
	rspamd_snprintf(urlbuf, sizeof(urlbuf), "http://%s/%d", host, file_size);
	msg = rspamd_http_message_from_url(urlbuf);

	g_assert(conn != NULL && msg != NULL);

	if (peer_key != NULL) {
		g_assert(client_key != NULL);
		rspamd_http_connection_set_key(conn, client_key);
		msg->peer_key = rspamd_pubkey_ref(peer_key);
	}

	cb = g_malloc(sizeof(*cb));
	cb->ts = rspamd_get_ticks();
	cb->lat = latency;
	cb->ev_base = ev_base;
	cb->wconns = wconns;
	latency->checked = FALSE;
	rspamd_http_connection_write_message(conn, msg, NULL, NULL, cb,
										 fd, NULL, ev_base);
}

static void
rspamd_worker_func(struct lat_elt *plat, guint32 *wconns)
{
	guint i, j;
	struct ev_loop *ev_base;
	struct itimerval itv;
	struct rspamd_keypair_cache *c = NULL;
	struct rspamd_cryptobox_keypair *client_key = NULL;
	struct rspamd_cryptobox_pubkey *peer_key = NULL;

	if (server_key) {
		peer_key = rspamd_pubkey_from_base32(server_key, 0, RSPAMD_KEYPAIR_KEX,
											 openssl_mode ? RSPAMD_CRYPTOBOX_MODE_NIST : RSPAMD_CRYPTOBOX_MODE_25519);
		g_assert(peer_key != NULL);
		client_key = rspamd_keypair_new(RSPAMD_KEYPAIR_KEX,
										openssl_mode ? RSPAMD_CRYPTOBOX_MODE_NIST : RSPAMD_CRYPTOBOX_MODE_25519);

		if (cache_size > 0) {
			c = rspamd_keypair_cache_new(cache_size);
		}
	}

	memset(&itv, 0, sizeof(itv));
	double_to_tv(test_time, &itv.it_value);

	ev_base = event_init();
	g_assert(setitimer(ITIMER_REAL, &itv, NULL) != -1);

	for (i = 0;; i = (i + 1) % store_latencies) {
		for (j = 0; j < pconns; j++) {
			rspamd_http_client_func(ev_base, &plat[i * pconns + j],
									wconns, peer_key, client_key, c);
		}

		conns_pending = pconns;

		event_base_loop(ev_base, 0);
	}
}

static int
cmpd(const void *p1, const void *p2)
{
	const struct lat_elt *d1 = p1, *d2 = p2;

	return (d1->lat) - (d2->lat);
}

double
rspamd_http_calculate_mean(struct lat_elt *lats, double *std)
{
	guint i, cnt, checked = 0;
	gdouble mean = 0., dev = 0.;

	cnt = store_latencies * pconns;
	qsort(lats, cnt, sizeof(*lats), cmpd);

	for (i = 0; i < cnt; i++) {
		if (lats[i].checked) {
			mean += lats[i].lat;
			checked++;
		}
	}

	g_assert(checked > 0);
	mean /= checked;

	for (i = 0; i < cnt; i++) {
		if (lats[i].checked) {
			dev += pow((lats[i].lat - mean), 2);
		}
	}

	dev /= checked;

	*std = sqrt(dev);
	return mean;
}

static void
rspamd_http_start_workers(pid_t *sfd)
{
	guint i;
	for (i = 0; i < nworkers; i++) {
		sfd[i] = fork();
		g_assert(sfd[i] != -1);

		if (sfd[i] == 0) {
			gperf_profiler_init(NULL, "http-bench");
			rspamd_worker_func(&latencies[i * pconns * store_latencies],
							   &conns_done[i]);
			gperf_profiler_stop();
			exit(EXIT_SUCCESS);
		}

		workers_left++;
	}
}

static void
rspamd_http_stop_workers(pid_t *sfd)
{
	guint i;
	gint res;

	for (i = 0; i < nworkers; i++) {
		kill(sfd[i], SIGTERM);
		wait(&res);
	}
}

static void
rspamd_http_bench_term(int fd, short what, void *arg)
{
	pid_t *sfd = arg;

	rspamd_http_stop_workers(sfd);
	event_loopexit(NULL);
}

static void
rspamd_http_bench_cld(int fd, short what, void *arg)
{
	gint res;

	while (waitpid(-1, &res, WNOHANG) > 0) {
		if (--workers_left == 0) {
			event_loopexit(NULL);
		}
	}
}


int main(int argc, char **argv)
{
	GOptionContext *context;
	GError *error = NULL;
	pid_t *sfd;
	struct ev_loop *ev_base;
	rspamd_mempool_t *pool = rspamd_mempool_new(8192, "http-bench");
	struct event term_ev, int_ev, cld_ev;
	guint64 total_done;
	FILE *lat_file;
	gdouble mean, std;
	guint i;

	rspamd_init_libs();

	context = g_option_context_new(
		"rspamd-http-bench - test server for benchmarks");
	g_option_context_set_summary(context,
								 "Summary:\n  Rspamd test HTTP benchmark " RVERSION
								 "\n  Release id: " RID);
	g_option_context_add_main_entries(context, entries, NULL);

	if (!g_option_context_parse(context, &argc, &argv, &error)) {
		rspamd_fprintf(stderr, "option parsing failed: %s\n", error->message);
		g_error_free(error);
		exit(EXIT_FAILURE);
	}

	rspamd_parse_inet_address(&addr, host, 0);
	g_assert(addr != NULL);
	rspamd_inet_address_set_port(addr, port);

	latencies = rspamd_mempool_alloc_shared(pool,
											nworkers * pconns * store_latencies * sizeof(*latencies));
	sfd = g_malloc(sizeof(*sfd) * nworkers);
	conns_done = rspamd_mempool_alloc_shared(pool, sizeof(guint32) * nworkers);
	memset(conns_done, 0, sizeof(guint32) * nworkers);

	rspamd_http_start_workers(sfd);

	ev_base = event_init();

	event_set(&term_ev, SIGTERM, EV_SIGNAL, rspamd_http_bench_term, sfd);
	event_base_set(ev_base, &term_ev);
	event_add(&term_ev, NULL);
	event_set(&int_ev, SIGINT, EV_SIGNAL, rspamd_http_bench_term, sfd);
	event_base_set(ev_base, &int_ev);
	event_add(&int_ev, NULL);
	event_set(&cld_ev, SIGCHLD, EV_SIGNAL | EV_PERSIST,
			  rspamd_http_bench_cld, NULL);
	event_base_set(ev_base, &cld_ev);
	event_add(&cld_ev, NULL);

	event_base_loop(ev_base, 0);

	total_done = 0;
	for (i = 0; i < nworkers; i++) {
		total_done += conns_done[i];
	}

	mean = rspamd_http_calculate_mean(latencies, &std);

	if (!csv_output) {
		rspamd_printf(
			"Made %L connections of size %d in %.6fs, %.6f cps, %.6f MB/sec\n",
			total_done,
			file_size,
			test_time,
			total_done / test_time,
			total_done * file_size / test_time / (1024.0 * 1024.0));
		rspamd_printf("Latency: %.6f ms mean, %.6f dev\n",
					  mean * 1000.0, std * 1000.0);
	}
	else {
		/* size,connections,time,mean,stddev,conns,workers */
		rspamd_printf("%ud,%L,%.1f,%.6f,%.6f,%ud,%ud\n",
					  file_size,
					  total_done,
					  test_time,
					  mean * 1000.0,
					  std * 1000.0,
					  pconns,
					  nworkers);
	}

	if (latencies_file) {
		lat_file = fopen(latencies_file, "w");

		if (lat_file) {
			for (i = 0; i < store_latencies * pconns; i++) {
				if (latencies[i].checked) {
					rspamd_fprintf(lat_file, "%.6f\n", latencies[i].lat);
				}
			}

			fclose(lat_file);
		}
	}

	rspamd_mempool_delete(pool);

	return 0;
}