libwebsockets/test-server/test-server-pthreads.c

/*
 * libwebsockets-test-server - libwebsockets test implementation
 *
 * Copyright (C) 2010-2015 Andy Green <andy@warmcat.com>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation:
 *  version 2.1 of the License.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA  02110-1301  USA
 */

#include "test-server.h"
#include <pthread.h>

int close_testing;
int max_poll_elements;

#ifdef EXTERNAL_POLL
struct lws_pollfd *pollfds;
int *fd_lookup;
int count_pollfds;
#endif
volatile int force_exit = 0;
struct lws_context *context;

/*
 * This mutex lock protects code that changes or relies on wsi list outside of
 * the service thread.  The service thread will acquire it when changing the
 * wsi list and other threads should acquire it while dereferencing wsis or
 * calling apis like lws_callback_on_writable_all_protocol() which
 * use the wsi list and wsis from a different thread context.
 */
pthread_mutex_t lock_established_conns;

/* http server gets files from this path */
#define LOCAL_RESOURCE_PATH INSTALL_DATADIR"/libwebsockets-test-server"
char *resource_path = LOCAL_RESOURCE_PATH;

/*
 * multithreaded version - protect wsi lifecycle changes in the library
 * these are called from protocol 0 callbacks
 */

void test_server_lock(int care)
{
	if (care)
		pthread_mutex_lock(&lock_established_conns);
}
void test_server_unlock(int care)
{
	if (care)
		pthread_mutex_unlock(&lock_established_conns);
}

/*
 * This demo server shows how to use libwebsockets for one or more
 * websocket protocols in the same server
 *
 * It defines the following websocket protocols:
 *
 *  dumb-increment-protocol:  once the socket is opened, an incrementing
 *				ascii string is sent down it every 50ms.
 *				If you send "reset\n" on the websocket, then
 *				the incrementing number is reset to 0.
 *
 *  lws-mirror-protocol: copies any received packet to every connection also
 *				using this protocol, including the sender
 */

enum demo_protocols {
	/* always first */
	PROTOCOL_HTTP = 0,

	PROTOCOL_DUMB_INCREMENT,
	PROTOCOL_LWS_MIRROR,

	/* always last */
	DEMO_PROTOCOL_COUNT
};

/* list of supported protocols and callbacks */

static struct lws_protocols protocols[] = {
	/* first protocol must always be HTTP handler */

	{
		"http-only",		/* name */
		callback_http,		/* callback */
		sizeof (struct per_session_data__http),	/* per_session_data_size */
		0,			/* max frame size / rx buffer */
	},
	{
		"dumb-increment-protocol",
		callback_dumb_increment,
		sizeof(struct per_session_data__dumb_increment),
		10,
	},
	{
		"lws-mirror-protocol",
		callback_lws_mirror,
		sizeof(struct per_session_data__lws_mirror),
		128,
	},
	{ NULL, NULL, 0, 0 } /* terminator */
};

void *thread_dumb_increment(void *threadid)
{
	while (!force_exit) {
		/*
		 * this lock means wsi in the active list cannot
		 * disappear underneath us, because the code to add and remove
		 * them is protected by the same lock
		 */
		pthread_mutex_lock(&lock_established_conns);
		lws_callback_on_writable_all_protocol(context,
				&protocols[PROTOCOL_DUMB_INCREMENT]);
		pthread_mutex_unlock(&lock_established_conns);
		usleep(100000);
	}
	
	pthread_exit(NULL);
}

void sighandler(int sig)
{
	force_exit = 1;
	lws_cancel_service(context);
}

static struct option options[] = {
	{ "help",	no_argument,		NULL, 'h' },
	{ "debug",	required_argument,	NULL, 'd' },
	{ "port",	required_argument,	NULL, 'p' },
	{ "ssl",	no_argument,		NULL, 's' },
	{ "allow-non-ssl",	no_argument,	NULL, 'a' },
	{ "interface",  required_argument,	NULL, 'i' },
	{ "closetest",  no_argument,		NULL, 'c' },
	{ "libev",  no_argument,		NULL, 'e' },
#ifndef LWS_NO_DAEMONIZE
	{ "daemonize", 	no_argument,		NULL, 'D' },
#endif
	{ "resource_path", required_argument,	NULL, 'r' },
	{ NULL, 0, 0, 0 }
};

int main(int argc, char **argv)
{
	struct lws_context_creation_info info;
	char interface_name[128] = "";
	const char *iface = NULL;
	pthread_t pthread_dumb;
	char cert_path[1024];
	char key_path[1024];
 	int debug_level = 7;
	int use_ssl = 0;
	void *retval;
	int opts = 0;
	int n = 0;
#ifndef _WIN32
	int syslog_options = LOG_PID | LOG_PERROR;
#endif
#ifndef LWS_NO_DAEMONIZE
 	int daemonize = 0;
#endif

	/* 
	 * take care to zero down the info struct, he contains random garbaage
	 * from the stack otherwise
	 */
	memset(&info, 0, sizeof info);
	info.port = 7681;

	pthread_mutex_init(&lock_established_conns, NULL);
	
	while (n >= 0) {
		n = getopt_long(argc, argv, "eci:hsap:d:Dr:", options, NULL);
		if (n < 0)
			continue;
		switch (n) {
		case 'e':
			opts |= LWS_SERVER_OPTION_LIBEV;
			break;
#ifndef LWS_NO_DAEMONIZE
		case 'D':
			daemonize = 1;
			#ifndef _WIN32
			syslog_options &= ~LOG_PERROR;
			#endif
			break;
#endif
		case 'd':
			debug_level = atoi(optarg);
			break;
		case 's':
			use_ssl = 1;
			break;
		case 'a':
			opts |= LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT;
			break;
		case 'p':
			info.port = atoi(optarg);
			break;
		case 'i':
			strncpy(interface_name, optarg, sizeof interface_name);
			interface_name[(sizeof interface_name) - 1] = '\0';
			iface = interface_name;
			break;
		case 'c':
			close_testing = 1;
			fprintf(stderr, " Close testing mode -- closes on "
					   "client after 50 dumb increments"
					   "and suppresses lws_mirror spam\n");
			break;
		case 'r':
			resource_path = optarg;
			printf("Setting resource path to \"%s\"\n", resource_path);
			break;
		case 'h':
			fprintf(stderr, "Usage: test-server "
					"[--port=<p>] [--ssl] "
					"[-d <log bitfield>] "
					"[--resource_path <path>]\n");
			exit(1);
		}
	}

#if !defined(LWS_NO_DAEMONIZE) && !defined(WIN32)
	/* 
	 * normally lock path would be /var/lock/lwsts or similar, to
	 * simplify getting started without having to take care about
	 * permissions or running as root, set to /tmp/.lwsts-lock
	 */
	if (daemonize && lws_daemonize("/tmp/.lwsts-lock")) {
		fprintf(stderr, "Failed to daemonize\n");
		return 1;
	}
#endif

	signal(SIGINT, sighandler);

#ifndef _WIN32
	/* we will only try to log things according to our debug_level */
	setlogmask(LOG_UPTO (LOG_DEBUG));
	openlog("lwsts", syslog_options, LOG_DAEMON);
#endif

	/* tell the library what debug level to emit and to send it to syslog */
	lws_set_log_level(debug_level, lwsl_emit_syslog);

	lwsl_notice("libwebsockets test server - "
		    "(C) Copyright 2010-2015 Andy Green <andy@warmcat.com> - "
		    "licensed under LGPL2.1\n");

	printf("Using resource path \"%s\"\n", resource_path);
#ifdef EXTERNAL_POLL
	max_poll_elements = getdtablesize();
	pollfds = malloc(max_poll_elements * sizeof (struct lws_pollfd));
	fd_lookup = malloc(max_poll_elements * sizeof (int));
	if (pollfds == NULL || fd_lookup == NULL) {
		lwsl_err("Out of memory pollfds=%d\n", max_poll_elements);
		return -1;
	}
#endif

	info.iface = iface;
	info.protocols = protocols;
#ifndef LWS_NO_EXTENSIONS
	info.extensions = lws_get_internal_extensions();
#endif
	
	info.ssl_cert_filepath = NULL;
	info.ssl_private_key_filepath = NULL;

	if (use_ssl) {
		if (strlen(resource_path) > sizeof(cert_path) - 32) {
			lwsl_err("resource path too long\n");
			return -1;
		}
		sprintf(cert_path, "%s/libwebsockets-test-server.pem",
			resource_path);
		if (strlen(resource_path) > sizeof(key_path) - 32) {
			lwsl_err("resource path too long\n");
			return -1;
		}
		sprintf(key_path, "%s/libwebsockets-test-server.key.pem",
			resource_path);

		info.ssl_cert_filepath = cert_path;
		info.ssl_private_key_filepath = key_path;
	}
	info.gid = -1;
	info.uid = -1;
	info.options = opts;

	context = lws_create_context(&info);
	if (context == NULL) {
		lwsl_err("libwebsocket init failed\n");
		return -1;
	}

	/* start the dumb increment thread */
	
	n = pthread_create(&pthread_dumb, NULL, thread_dumb_increment, 0);
	if (n) {
		lwsl_err("Unable to create dumb thread\n");
		goto done;
	}
	
	/* this is our service thread */
	
	n = 0;
	while (n >= 0 && !force_exit) {
 		n = lws_service(context, 50);
	}

	/* wait for pthread_dumb to exit */
	pthread_join(pthread_dumb, &retval);
	
done:
	lws_context_destroy(context);	
	pthread_mutex_destroy(&lock_established_conns);
	

	lwsl_notice("libwebsockets-test-server exited cleanly\n");

#ifndef _WIN32
	closelog();
#endif

	return 0;
}