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/*
* lws-minimal-http-server-eventlib-foreign
*
* Written in 2010-2020 by Andy Green <andy@warmcat.com>
*
* This file is made available under the Creative Commons CC0 1.0
* Universal Public Domain Dedication.
*
* This demonstrates the most minimal http server you can make with lws that
* uses a libuv event loop created outside lws. It shows how lws can
* participate in someone else's event loop and clean up after itself.
*
* You choose the event loop to work with at runtime, by giving the
* --uv, --event or --ev switch. Lws has to have been configured to build the
* selected event lib support.
*
* To keep it simple, it serves stuff from the subdirectory
* "./mount-origin" of the directory it was started in.
* You can change that by changing mount.origin below.
*/
#include <libwebsockets.h>
#include <string.h>
#include <signal.h>
#include "private.h"
static struct lws_context_creation_info info;
static const struct ops *ops = NULL;
struct lws_context *context;
int lifetime = 5, reported;
enum {
TEST_STATE_CREATE_LWS_CONTEXT,
TEST_STATE_DESTROY_LWS_CONTEXT,
TEST_STATE_EXIT
};
static int sequence = TEST_STATE_CREATE_LWS_CONTEXT;
static const struct lws_http_mount mount = {
/* .mount_next */ NULL, /* linked-list "next" */
/* .mountpoint */ "/", /* mountpoint URL */
/* .origin */ "./mount-origin", /* serve from dir */
/* .def */ "index.html", /* default filename */
/* .protocol */ NULL,
/* .cgienv */ NULL,
/* .extra_mimetypes */ NULL,
/* .interpret */ NULL,
/* .cgi_timeout */ 0,
/* .cache_max_age */ 0,
/* .auth_mask */ 0,
/* .cache_reusable */ 0,
/* .cache_revalidate */ 0,
/* .cache_intermediaries */ 0,
/* .origin_protocol */ LWSMPRO_FILE, /* files in a dir */
/* .mountpoint_len */ 1, /* char count */
/* .basic_auth_login_file */ NULL,
};
void
signal_cb(int signum)
{
lwsl_notice("Signal %d caught, exiting...\n", signum);
switch (signum) {
case SIGTERM:
case SIGINT:
break;
default:
break;
}
lws_context_destroy(context);
}
static int
callback_http(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
switch (reason) {
case LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP:
lwsl_user("LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP: resp %u\n",
lws_http_client_http_response(wsi));
break;
/* because we are protocols[0] ... */
case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
lwsl_err("CLIENT_CONNECTION_ERROR: %s\n",
in ? (char *)in : "(null)");
break;
/* chunks of chunked content, with header removed */
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ:
lwsl_user("RECEIVE_CLIENT_HTTP_READ: read %d\n", (int)len);
lwsl_hexdump_info(in, len);
return 0; /* don't passthru */
/* uninterpreted http content */
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP:
{
char buffer[1024 + LWS_PRE];
char *px = buffer + LWS_PRE;
int lenx = sizeof(buffer) - LWS_PRE;
if (lws_http_client_read(wsi, &px, &lenx) < 0)
return -1;
}
return 0; /* don't passthru */
case LWS_CALLBACK_COMPLETED_CLIENT_HTTP:
lwsl_user("LWS_CALLBACK_COMPLETED_CLIENT_HTTP %s\n",
lws_wsi_tag(wsi));
break;
case LWS_CALLBACK_CLOSED_CLIENT_HTTP:
lwsl_info("%s: closed: %s\n", __func__, lws_wsi_tag(wsi));
break;
default:
break;
}
return lws_callback_http_dummy(wsi, reason, user, in, len);
}
static const struct lws_protocols protocols[] = {
{ "httptest", callback_http, 0, 0, 0, NULL, 0},
LWS_PROTOCOL_LIST_TERM
};
static int
do_client_conn(void)
{
struct lws_client_connect_info i;
memset(&i, 0, sizeof i); /* otherwise uninitialized garbage */
i.context = context;
i.ssl_connection = LCCSCF_USE_SSL;
i.port = 443;
i.address = "warmcat.com";
i.ssl_connection |= LCCSCF_H2_QUIRK_OVERFLOWS_TXCR |
LCCSCF_H2_QUIRK_NGHTTP2_END_STREAM;
i.path = "/";
i.host = i.address;
i.origin = i.address;
i.method = "GET";
i.local_protocol_name = protocols[0].name;
#if defined(LWS_WITH_SYS_FAULT_INJECTION)
i.fi_wsi_name = "user";
#endif
if (!lws_client_connect_via_info(&i)) {
lwsl_err("Client creation failed\n");
return 1;
}
return 0;
}
/* this is called at 1Hz using a foreign loop timer */
void
foreign_timer_service(void *foreign_loop)
{
void *foreign_loops[1];
lwsl_user("Foreign 1Hz timer\n");
if (sequence == TEST_STATE_EXIT && !context && !reported) {
/*
* at this point the lws_context_destroy() we did earlier
* has completed and the entire context is wholly destroyed
*/
lwsl_user("lws_destroy_context() done, continuing for 5s\n");
reported = 1;
}
if (--lifetime)
return;
switch (sequence++) {
case TEST_STATE_CREATE_LWS_CONTEXT:
/* this only has to exist for the duration of create context */
foreign_loops[0] = foreign_loop;
info.foreign_loops = foreign_loops;
context = lws_create_context(&info);
if (!context) {
lwsl_err("lws init failed\n");
return;
}
lwsl_user("LWS Context created and will be active for 10s\n");
do_client_conn();
lifetime = 11;
break;
case TEST_STATE_DESTROY_LWS_CONTEXT:
/* cleanup the lws part */
lwsl_user("Destroying lws context and continuing loop for 5s\n");
lws_context_destroy(context);
lifetime = 6;
break;
case TEST_STATE_EXIT:
lwsl_user("Deciding to exit foreign loop too\n");
ops->stop();
break;
default:
break;
}
}
int main(int argc, const char **argv)
{
const char *p;
int logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE
/* for LLL_ verbosity above NOTICE to be built into lws,
* lws must have been configured and built with
* -DCMAKE_BUILD_TYPE=DEBUG instead of =RELEASE */
/* | LLL_INFO */ /* | LLL_PARSER */ /* | LLL_HEADER */
/* | LLL_EXT */ /* | LLL_CLIENT */ /* | LLL_LATENCY */
/* | LLL_DEBUG */;
if ((p = lws_cmdline_option(argc, argv, "-d")))
logs = atoi(p);
lws_set_log_level(logs, NULL);
lwsl_user("LWS minimal http server eventlib + foreign loop |"
" visit http://localhost:7681\n");
/*
* We prepare the info here, but don't use it until later in the
* timer callback, to demonstrate the independence of the foreign loop
* and lws.
*/
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
info.port = 7681;
if ((p = lws_cmdline_option(argc, argv, "-p")))
info.port = atoi(p);
info.mounts = &mount;
info.error_document_404 = "/404.html";
info.pcontext = &context;
info.protocols = protocols;
info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT |
LWS_SERVER_OPTION_HTTP_HEADERS_SECURITY_BEST_PRACTICES_ENFORCE;
if (lws_cmdline_option(argc, argv, "-s")) {
info.ssl_cert_filepath = "localhost-100y.cert";
info.ssl_private_key_filepath = "localhost-100y.key";
}
/*
* We configure lws to use the chosen event loop, and select the
* matching event-lib specific code for our demo operations
*/
#if defined(LWS_WITH_LIBUV)
if (lws_cmdline_option(argc, argv, "--uv")) {
info.options |= LWS_SERVER_OPTION_LIBUV;
ops = &ops_libuv;
lwsl_notice("%s: using libuv event loop\n", __func__);
} else
#endif
#if defined(LWS_WITH_LIBEVENT)
if (lws_cmdline_option(argc, argv, "--event")) {
info.options |= LWS_SERVER_OPTION_LIBEVENT;
ops = &ops_libevent;
lwsl_notice("%s: using libevent loop\n", __func__);
} else
#endif
#if defined(LWS_WITH_LIBEV)
if (lws_cmdline_option(argc, argv, "--ev")) {
info.options |= LWS_SERVER_OPTION_LIBEV;
ops = &ops_libev;
lwsl_notice("%s: using libev loop\n", __func__);
} else
#endif
#if defined(LWS_WITH_GLIB)
if (lws_cmdline_option(argc, argv, "--glib")) {
info.options |= LWS_SERVER_OPTION_GLIB;
ops = &ops_glib;
lwsl_notice("%s: using glib loop\n", __func__);
} else
#endif
#if defined(LWS_WITH_SDEVENT)
if (lws_cmdline_option(argc, argv, "--sd")) {
info.options |= LWS_SERVER_OPTION_SDEVENT;
ops = &ops_sdevent;
lwsl_notice("%s: using sd-event loop\n", __func__);
} else
#endif
#if defined(LWS_WITH_ULOOP)
if (lws_cmdline_option(argc, argv, "--uloop")) {
info.options |= LWS_SERVER_OPTION_ULOOP;
ops = &ops_uloop;
lwsl_notice("%s: using uloop loop\n", __func__);
} else
#endif
{
lwsl_err("This app only makes sense when used\n");
lwsl_err(" with a foreign loop, --uv, --event, --glib, --ev or --sd\n");
return 1;
}
lwsl_user(" This app creates a foreign event loop with a timer +\n");
lwsl_user(" signalhandler, and performs a test in three phases:\n");
lwsl_user("\n");
lwsl_user(" 1) 5s: Runs the loop with just the timer\n");
lwsl_user(" 2) 10s: create an lws context serving on localhost:7681\n");
lwsl_user(" using the same foreign loop. Destroy it after 10s.\n");
lwsl_user(" 3) 5s: Run the loop again with just the timer\n");
lwsl_user("\n");
lwsl_user(" Finally close only the timer and signalhandler and\n");
lwsl_user(" exit the loop cleanly\n");
lwsl_user("\n");
/* foreign loop specific startup and run */
ops->init_and_run();
lws_context_destroy(context);
/* foreign loop specific cleanup and exit */
ops->cleanup();
lwsl_user("%s: exiting...\n", __func__);
return 0;
}
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