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minimal examples: ws-server-threads-smp

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Andy Green 2019-01-28 07:02:33 +08:00
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1
minimal-examples/ws-server/README.md
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@ -7,6 +7,7 @@ minimal-ws-server-pmd-corner|Corner-case tests for permessage-deflate
minimal-ws-server-pmd|Simple ws server with permessage-deflate support
minimal-ws-server-ring|Like minimal-ws-server but holds the chat in a multi-tail ringbuffer
minimal-ws-server-threadpool|Demonstrates how to use a worker thread pool with lws
minimal-ws-server-threads-smp|SMP ws server where data is produced by different threads with multiple lws service threads too
minimal-ws-server-threads|Simple ws server where data is produced by different threads
minimal-ws-server|Serves an index.html over http that opens a ws shared chat client in a browser

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minimal-examples/ws-server/minimal-ws-server-threads-smp/CMakeLists.txt Normal file
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cmake_minimum_required(VERSION 2.8)
include(CheckIncludeFile)
include(CheckCSourceCompiles)
set(SAMP lws-minimal-ws-server-threads-smp)
set(SRCS minimal-ws-server.c)
MACRO(require_pthreads result)
CHECK_INCLUDE_FILE(pthread.h LWS_HAVE_PTHREAD_H)
if (NOT LWS_HAVE_PTHREAD_H)
if (LWS_WITH_MINIMAL_EXAMPLES)
set(result 0)
else()
message(FATAL_ERROR "threading support requires pthreads")
endif()
endif()
ENDMACRO()
# If we are being built as part of lws, confirm current build config supports
# reqconfig, else skip building ourselves.
#
# If we are being built externally, confirm installed lws was configured to
# support reqconfig, else error out with a helpful message about the problem.
#
MACRO(require_lws_config reqconfig _val result)
if (DEFINED ${reqconfig})
if (${reqconfig})
set (rq 1)
else()
set (rq 0)
endif()
else()
set(rq 0)
endif()
if (${_val} EQUAL ${rq})
set(SAME 1)
else()
set(SAME 0)
endif()
if (LWS_WITH_MINIMAL_EXAMPLES AND NOT ${SAME})
if (${_val})
message("${SAMP}: skipping as lws being built without ${reqconfig}")
else()
message("${SAMP}: skipping as lws built with ${reqconfig}")
endif()
set(${result} 0)
else()
if (LWS_WITH_MINIMAL_EXAMPLES)
set(MET ${SAME})
else()
CHECK_C_SOURCE_COMPILES("#include <libwebsockets.h>\nint main(void) {\n#if defined(${reqconfig})\n return 0;\n#else\n fail;\n#endif\n return 0;\n}\n" HAS_${reqconfig})
if (NOT DEFINED HAS_${reqconfig} OR NOT HAS_${reqconfig})
set(HAS_${reqconfig} 0)
else()
set(HAS_${reqconfig} 1)
endif()
if ((HAS_${reqconfig} AND ${_val}) OR (NOT HAS_${reqconfig} AND NOT ${_val}))
set(MET 1)
else()
set(MET 0)
endif()
endif()
if (NOT MET)
if (${_val})
message(FATAL_ERROR "This project requires lws must have been configured with ${reqconfig}")
else()
message(FATAL_ERROR "Lws configuration of ${reqconfig} is incompatible with this project")
endif()
endif()
endif()
ENDMACRO()
set(requirements 1)
require_pthreads(requirements)
require_lws_config(LWS_ROLE_WS 1 requirements)
require_lws_config(LWS_WITHOUT_SERVER 0 requirements)
if (requirements)
add_executable(${SAMP} ${SRCS})
if (websockets_shared)
target_link_libraries(${SAMP} websockets_shared pthread)
add_dependencies(${SAMP} websockets_shared)
else()
target_link_libraries(${SAMP} websockets pthread)
endif()
endif()

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minimal-examples/ws-server/minimal-ws-server-threads-smp/README.md Normal file
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@ -0,0 +1,39 @@
# lws minimal ws server (threads) + SMP
This demonstrates both independent threads creating content
as in the -threads example, and multiple service threads
as in the http-server-smp example (but with ws).
## build
You must first build libwebsockets itself with cmake `-DLWS_MAX_SMP=8`
or some other number greater than one.
```
$ cmake . && make
```
Pthreads is required on your system.
## usage
```
$ ./lws-minimal-ws-server-threads-smp
[2019/01/28 06:59:17:4217] USER: LWS minimal ws server + threads + smp | visit http://localhost:7681
[2019/01/28 06:59:17:4219] NOTICE: Service threads: 2
[2019/01/28 06:59:17:4220] NOTICE: LWS_CALLBACK_EVENT_WAIT_CANCELLED in svc tid 0x7fec48af8700
[2019/01/28 06:59:17:4220] NOTICE: LWS_CALLBACK_EVENT_WAIT_CANCELLED in svc tid 0x7fec48af8700
...
```
Visit http://localhost:7681 on multiple browser windows. You may need to open
4 before the second service thread is used (check "svc tid" in the browser output).
Two lws service threads are started.
Two separate asynchronous threads generate strings and add them to a ringbuffer,
signalling all lws service threads to send new entries to all the browser windows.
This demonstrates how to safely manage asynchronously generated content
and hook it up to the lws service threads.

146
minimal-examples/ws-server/minimal-ws-server-threads-smp/minimal-ws-server.c Normal file
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/*
* lws-minimal-ws-server
*
* Copyright (C) 2018 Andy Green <andy@warmcat.com>
*
* This file is made available under the Creative Commons CC0 1.0
* Universal Public Domain Dedication.
*
* This demonstrates a minimal ws server that can cooperate with
* other threads cleanly. Two other threads are started, which fill
* a ringbuffer with strings at 10Hz.
*
* The actual work and thread spawning etc are done in the protocol
* implementation in protocol_lws_minimal.c.
*
* To keep it simple, it serves stuff in the subdirectory "./mount-origin" of
* the directory it was started in.
* You can change that by changing mount.origin.
*/
#include <libwebsockets.h>
#include <string.h>
#include <signal.h>
#include <pthread.h>
#define LWS_PLUGIN_STATIC
#include "protocol_lws_minimal.c"
#define COUNT_THREADS 2
static struct lws_protocols protocols[] = {
{ "http", lws_callback_http_dummy, 0, 0 },
LWS_PLUGIN_PROTOCOL_MINIMAL,
{ NULL, NULL, 0, 0 } /* terminator */
};
static struct lws_context *context;
static int interrupted;
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,
};
/*
* This demonstrates how to pass a pointer into a specific protocol handler
* running on a specific vhost. In this case, it's our default vhost and
* we pass the pvo named "config" with the value a const char * "myconfig".
*
* This is the preferred way to pass configuration into a specific vhost +
* protocol instance.
*/
static const struct lws_protocol_vhost_options pvo_ops = {
NULL,
NULL,
"config", /* pvo name */
(void *)"myconfig" /* pvo value */
};
static const struct lws_protocol_vhost_options pvo = {
NULL, /* "next" pvo linked-list */
&pvo_ops, /* "child" pvo linked-list */
"lws-minimal", /* protocol name we belong to on this vhost */
"" /* ignored */
};
void *thread_service(void *threadid)
{
while (lws_service_tsi(context, 1000,
(int)(lws_intptr_t)threadid) >= 0 &&
!interrupted)
;
pthread_exit(NULL);
}
void sigint_handler(int sig)
{
interrupted = 1;
}
int main(int argc, const char **argv)
{
int n, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE;
pthread_t pthread_service[COUNT_THREADS];
struct lws_context_creation_info info;
const char *p;
void *retval;
signal(SIGINT, sigint_handler);
if ((p = lws_cmdline_option(argc, argv, "-d")))
logs = atoi(p);
lws_set_log_level(logs, NULL);
lwsl_user("LWS minimal ws server + threads + smp | visit http://localhost:7681\n");
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
info.port = 7681;
info.mounts = &mount;
info.protocols = protocols;
info.pvo = &pvo; /* per-vhost options */
info.count_threads = COUNT_THREADS;
info.options =
LWS_SERVER_OPTION_HTTP_HEADERS_SECURITY_BEST_PRACTICES_ENFORCE;
context = lws_create_context(&info);
if (!context) {
lwsl_err("lws init failed\n");
return 1;
}
lwsl_notice(" Service threads: %d\n", lws_get_count_threads(context));
/* start all the service threads */
for (n = 0; n < lws_get_count_threads(context); n++)
if (pthread_create(&pthread_service[n], NULL, thread_service,
(void *)(lws_intptr_t)n))
lwsl_err("Failed to start service thread\n");
/* wait for all the service threads to exit */
while ((--n) >= 0)
pthread_join(pthread_service[n], &retval);
lws_context_destroy(context);
return 0;
}

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minimal-examples/ws-server/minimal-ws-server-threads-smp/mount-origin/example.js Normal file
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@ -0,0 +1,71 @@
var head = 0, tail = 0, ring = new Array();
function get_appropriate_ws_url(extra_url)
{
var pcol;
var u = document.URL;
/*
* We open the websocket encrypted if this page came on an
* https:// url itself, otherwise unencrypted
*/
if (u.substring(0, 5) === "https") {
pcol = "wss://";
u = u.substr(8);
} else {
pcol = "ws://";
if (u.substring(0, 4) === "http")
u = u.substr(7);
}
u = u.split("/");
/* + "/xxx" bit is for IE10 workaround */
return pcol + u[0] + "/" + extra_url;
}
function new_ws(urlpath, protocol)
{
if (typeof MozWebSocket != "undefined")
return new MozWebSocket(urlpath, protocol);
return new WebSocket(urlpath, protocol);
}
document.addEventListener("DOMContentLoaded", function() {
ws = new_ws(get_appropriate_ws_url(""), "lws-minimal");
try {
ws.onopen = function() {
document.getElementById("r").disabled = 0;
};
ws.onmessage =function got_packet(msg) {
var n, s = "";
ring[head] = msg.data + "\n";
head = (head + 1) % 50;
if (tail === head)
tail = (tail + 1) % 50;
n = tail;
do {
s = s + ring[n];
n = (n + 1) % 50;
} while (n !== head);
document.getElementById("r").value = s;
document.getElementById("r").scrollTop =
document.getElementById("r").scrollHeight;
};
ws.onclose = function(){
document.getElementById("r").disabled = 1;
};
} catch(exception) {
alert("<p>Error " + exception);
}
}, false);

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minimal-examples/ws-server/minimal-ws-server-threads-smp/mount-origin/index.html Normal file
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@ -0,0 +1,19 @@
<html>
<head>
<meta charset=utf-8 http-equiv="Content-Language" content="en"/>
<script src="/example.js"></script>
</head>
<body>
<img src="libwebsockets.org-logo.svg">
<img src="strict-csp.svg"><br>
<b>Minimal ws server threads SMP example</b>.<br>
Strings generated by server threads are sent to
all browsers open on this page.<br>
The textarea show the last 50 lines received.
<br>
<br>
<textarea id=r readonly cols=80 rows=50></textarea><br>
</body>
</html>

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minimal-examples/ws-server/minimal-ws-server-threads-smp/mount-origin/libwebsockets.org-logo.svg Normal file
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minimal-examples/ws-server/minimal-ws-server-threads-smp/protocol_lws_minimal.c Normal file
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/*
* ws protocol handler plugin for "lws-minimal" demonstrating multithread
*
* Copyright (C) 2010-2018 Andy Green <andy@warmcat.com>
*
* This file is made available under the Creative Commons CC0 1.0
* Universal Public Domain Dedication.
*/
#if !defined (LWS_PLUGIN_STATIC)
#define LWS_DLL
#define LWS_INTERNAL
#include <libwebsockets.h>
#endif
#include <string.h>
/* one of these created for each message in the ringbuffer */
struct msg {
void *payload; /* is malloc'd */
size_t len;
};
/*
* One of these is created for each client connecting to us.
*
* It is ONLY read or written from the lws service thread context.
*/
struct per_session_data__minimal {
struct per_session_data__minimal *pss_list;
struct lws *wsi;
uint32_t tail;
};
/* one of these is created for each vhost our protocol is used with */
struct per_vhost_data__minimal {
struct lws_context *context;
struct lws_vhost *vhost;
const struct lws_protocols *protocol;
struct per_session_data__minimal *pss_list; /* linked-list of live pss*/
pthread_t pthread_spam[2];
pthread_mutex_t lock_ring; /* serialize access to the ring buffer */
struct lws_ring *ring; /* {lock_ring} ringbuffer holding unsent content */
const char *config;
char finished;
};
/*
* This runs under both lws service and "spam threads" contexts.
* Access is serialized by vhd->lock_ring.
*/
static void
__minimal_destroy_message(void *_msg)
{
struct msg *msg = _msg;
free(msg->payload);
msg->payload = NULL;
msg->len = 0;
}
/*
* This runs under the "spam thread" thread context only.
*
* We spawn two threads that generate messages with this.
*
*/
static void *
thread_spam(void *d)
{
struct per_vhost_data__minimal *vhd =
(struct per_vhost_data__minimal *)d;
struct msg amsg;
int len = 128, index = 1, n;
do {
/* don't generate output if nobody connected */
if (!vhd->pss_list)
goto wait;
pthread_mutex_lock(&vhd->lock_ring); /* --------- ring lock { */
/* only create if space in ringbuffer */
n = (int)lws_ring_get_count_free_elements(vhd->ring);
if (!n) {
lwsl_user("dropping!\n");
goto wait_unlock;
}
amsg.payload = malloc(LWS_PRE + len);
if (!amsg.payload) {
lwsl_user("OOM: dropping\n");
goto wait_unlock;
}
n = lws_snprintf((char *)amsg.payload + LWS_PRE, len,
"%s: spam tid: %p, msg: %d", vhd->config,
(void *)pthread_self(), index++);
amsg.len = n;
n = lws_ring_insert(vhd->ring, &amsg, 1);
if (n != 1) {
__minimal_destroy_message(&amsg);
lwsl_user("dropping!\n");
} else
/*
* This will cause a LWS_CALLBACK_EVENT_WAIT_CANCELLED
* in the lws service thread context.
*/
lws_cancel_service(vhd->context);
wait_unlock:
pthread_mutex_unlock(&vhd->lock_ring); /* } ring lock ------- */
wait:
usleep(100000);
} while (!vhd->finished);
lwsl_notice("thread_spam %p exiting\n", (void *)pthread_self());
pthread_exit(NULL);
}
/* this runs under the lws service thread context only */
static int
callback_minimal(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
struct per_session_data__minimal *pss =
(struct per_session_data__minimal *)user;
struct per_vhost_data__minimal *vhd =
(struct per_vhost_data__minimal *)
lws_protocol_vh_priv_get(lws_get_vhost(wsi),
lws_get_protocol(wsi));
const struct lws_protocol_vhost_options *pvo;
const struct msg *pmsg;
char temp[LWS_PRE + 256];
void *retval;
int n, m, r = 0;
switch (reason) {
case LWS_CALLBACK_PROTOCOL_INIT:
/* create our per-vhost struct */
vhd = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi),
lws_get_protocol(wsi),
sizeof(struct per_vhost_data__minimal));
if (!vhd)
return 1;
pthread_mutex_init(&vhd->lock_ring, NULL);
/* recover the pointer to the globals struct */
pvo = lws_pvo_search(
(const struct lws_protocol_vhost_options *)in,
"config");
if (!pvo || !pvo->value) {
lwsl_err("%s: Can't find \"config\" pvo\n", __func__);
return 1;
}
vhd->config = pvo->value;
vhd->context = lws_get_context(wsi);
vhd->protocol = lws_get_protocol(wsi);
vhd->vhost = lws_get_vhost(wsi);
vhd->ring = lws_ring_create(sizeof(struct msg), 8,
__minimal_destroy_message);
if (!vhd->ring) {
lwsl_err("%s: failed to create ring\n", __func__);
return 1;
}
/* start the content-creating threads */
for (n = 0; n < (int)LWS_ARRAY_SIZE(vhd->pthread_spam); n++)
if (pthread_create(&vhd->pthread_spam[n], NULL,
thread_spam, vhd)) {
lwsl_err("thread creation failed\n");
r = 1;
goto init_fail;
}
break;
case LWS_CALLBACK_PROTOCOL_DESTROY:
init_fail:
vhd->finished = 1;
for (n = 0; n < (int)LWS_ARRAY_SIZE(vhd->pthread_spam); n++)
if (vhd->pthread_spam[n])
pthread_join(vhd->pthread_spam[n], &retval);
if (vhd->ring)
lws_ring_destroy(vhd->ring);
pthread_mutex_destroy(&vhd->lock_ring);
break;
case LWS_CALLBACK_ESTABLISHED:
/* add ourselves to the list of live pss held in the vhd */
lws_ll_fwd_insert(pss, pss_list, vhd->pss_list);
pss->tail = lws_ring_get_oldest_tail(vhd->ring);
pss->wsi = wsi;
break;
case LWS_CALLBACK_CLOSED:
/* remove our closing pss from the list of live pss */
lws_ll_fwd_remove(struct per_session_data__minimal, pss_list,
pss, vhd->pss_list);
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
pthread_mutex_lock(&vhd->lock_ring); /* --------- ring lock { */
pmsg = lws_ring_get_element(vhd->ring, &pss->tail);
if (!pmsg) {
pthread_mutex_unlock(&vhd->lock_ring); /* } ring lock ------- */
break;
}
n = lws_snprintf(temp + LWS_PRE, sizeof(temp) - LWS_PRE,
"svc tid:%p, %s", (void *)pthread_self(),
(char *)pmsg->payload + LWS_PRE);
/* notice we allowed for LWS_PRE in the payload already */
m = lws_write(wsi, (unsigned char *)temp + LWS_PRE, n,
LWS_WRITE_TEXT);
if (m < n) {
pthread_mutex_unlock(&vhd->lock_ring); /* } ring lock ------- */
lwsl_err("ERROR %d writing to ws socket\n", m);
return -1;
}
lws_ring_consume_and_update_oldest_tail(
vhd->ring, /* lws_ring object */
struct per_session_data__minimal, /* type of objects with tails */
&pss->tail, /* tail of guy doing the consuming */
1, /* number of payload objects being consumed */
vhd->pss_list, /* head of list of objects with tails */
tail, /* member name of tail in objects with tails */
pss_list /* member name of next object in objects with tails */
);
/* more to do? */
if (lws_ring_get_element(vhd->ring, &pss->tail))
/* come back as soon as we can write more */
lws_callback_on_writable(pss->wsi);
pthread_mutex_unlock(&vhd->lock_ring); /* } ring lock ------- */
break;
case LWS_CALLBACK_RECEIVE:
break;
case LWS_CALLBACK_EVENT_WAIT_CANCELLED:
lwsl_notice("LWS_CALLBACK_EVENT_WAIT_CANCELLED in svc tid %p\n",
(void *)pthread_self());
if (!vhd)
break;
/*
* When the "spam" threads add a message to the ringbuffer,
* they create this event in the lws service thread context
* using lws_cancel_service().
*
* We respond by scheduling a writable callback for all
* connected clients.
*/
lws_start_foreach_llp(struct per_session_data__minimal **,
ppss, vhd->pss_list) {
lws_callback_on_writable((*ppss)->wsi);
} lws_end_foreach_llp(ppss, pss_list);
break;
default:
break;
}
return r;
}
#define LWS_PLUGIN_PROTOCOL_MINIMAL \
{ \
"lws-minimal", \
callback_minimal, \
sizeof(struct per_session_data__minimal), \
128, \
0, NULL, 0 \
}
#if !defined (LWS_PLUGIN_STATIC)
/* boilerplate needed if we are built as a dynamic plugin */
static const struct lws_protocols protocols[] = {
LWS_PLUGIN_PROTOCOL_MINIMAL
};
LWS_EXTERN LWS_VISIBLE int
init_protocol_minimal(struct lws_context *context,
struct lws_plugin_capability *c)
{
if (c->api_magic != LWS_PLUGIN_API_MAGIC) {
lwsl_err("Plugin API %d, library API %d", LWS_PLUGIN_API_MAGIC,
c->api_magic);
return 1;
}
c->protocols = protocols;
c->count_protocols = LWS_ARRAY_SIZE(protocols);
c->extensions = NULL;
c->count_extensions = 0;
return 0;
}
LWS_EXTERN LWS_VISIBLE int
destroy_protocol_minimal(struct lws_context *context)
{
return 0;
}
#endif