libwebsockets/plugins/protocol_lws_server_status.c
Andy Green be9fb919d1 context deprecation
1) This makes lwsws run a parent process with the original permissions.
But this process is only able to respond to SIGHUP, it doesn't do anything
else.

2) You can send this parent process a SIGHUP now to cause it to

 - close listening sockets in existing lwsws processes

 - mark those processes as to exit when the number of active connections
   on the falls to zero

 - spawn a fresh child process from scratch, using latest configuration
   file content, latest plugins, etc.  It can now reopen listening sockets
   if it chooses to, or open different listen ports or whatever.

Notes:

1) lws_context_destroy() has been split into two pieces... the reason for
the split is the first part closes the per-vhost protocols, but since
they may have created libuv objects in the per-vhost protocol storage,
these cannot be freed until after the loop has been run.

That's the purpose of the second part of the context destruction,
lws_context_destroy2().

For compatibility, if you are not using libuv, the first part calls the
second part.  However if you are using libuv, you must now call the
second part from your own main.c after the first part.
2016-12-20 14:37:07 +08:00

236 lines
5.4 KiB
C

/*
* libwebsockets-test-server - libwebsockets test implementation
*
* Copyright (C) 2010-2016 Andy Green <andy@warmcat.com>
*
* This file is made available under the Creative Commons CC0 1.0
* Universal Public Domain Dedication.
*
* The person who associated a work with this deed has dedicated
* the work to the public domain by waiving all of his or her rights
* to the work worldwide under copyright law, including all related
* and neighboring rights, to the extent allowed by law. You can copy,
* modify, distribute and perform the work, even for commercial purposes,
* all without asking permission.
*
* The test apps are intended to be adapted for use in your code, which
* may be proprietary. So unlike the library itself, they are licensed
* Public Domain.
*/
#define LWS_DLL
#define LWS_INTERNAL
#include "../lib/libwebsockets.h"
#include <string.h>
#include <stdlib.h>
struct lws_ss_load_sample {
time_t t;
int load_x100;
};
struct lws_ss_filepath {
struct lws_ss_filepath *next;
char filepath[128];
};
struct lws_ss_dumps {
char buf[32768];
int length;
struct lws_ss_load_sample load[64];
int load_head;
int load_tail;
};
struct per_session_data__server_status {
int ver;
int pos;
};
struct per_vhost_data__lws_server_status {
uv_timer_t timeout_watcher;
struct lws_context *context;
int hide_vhosts;
int tow_flag;
struct lws_ss_dumps d;
struct lws_ss_filepath *fp;
};
static const struct lws_protocols protocols[1];
static void
uv_timeout_cb_server_status(uv_timer_t *w
#if UV_VERSION_MAJOR == 0
, int status
#endif
)
{
struct per_vhost_data__lws_server_status *v = lws_container_of(w,
struct per_vhost_data__lws_server_status,
timeout_watcher);
struct lws_ss_filepath *fp;
char *p = v->d.buf + LWS_PRE, contents[256], pure[256];
int n, l, first = 1, fd;
l = sizeof(v->d.buf) - LWS_PRE;
n = lws_snprintf(p, l, "{\"i\":");
p += n;
l -= n;
n = lws_json_dump_context(v->context, p, l, v->hide_vhosts);
p += n;
l -= n;
n = lws_snprintf(p, l, ", \"files\": [");
p += n;
l -= n;
fp = v->fp;
while (fp) {
if (!first) {
n = lws_snprintf(p, l, ",");
p += n;
l -= n;
}
fd = open(fp->filepath, LWS_O_RDONLY);
if (fd != LWS_INVALID_FILE) {
n = read(fd, contents, sizeof(contents) - 1);
if (n >= 0) {
contents[n] = '\0';
lws_json_purify(pure, contents, sizeof(pure));
n = lws_snprintf(p, l, "{\"path\":\"%s\",\"val\":\"%s\"}",
fp->filepath, pure);
p += n;
l -= n;
first = 0;
}
close(fd);
}
fp = fp->next;
}
n = lws_snprintf(p, l, "]}");
p += n;
l -= n;
v->d.length = p - (v->d.buf + LWS_PRE);
lws_callback_on_writable_all_protocol(v->context, &protocols[0]);
}
static int
callback_lws_server_status(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
const struct lws_protocol_vhost_options *pvo =
(const struct lws_protocol_vhost_options *)in;
struct per_vhost_data__lws_server_status *v =
(struct per_vhost_data__lws_server_status *)
lws_protocol_vh_priv_get(lws_get_vhost(wsi),
lws_get_protocol(wsi));
struct lws_ss_filepath *fp, *fp1, **fp_old;
int m, period = 1000;
switch (reason) {
case LWS_CALLBACK_ESTABLISHED:
lwsl_info("%s: LWS_CALLBACK_ESTABLISHED\n", __func__);
lws_callback_on_writable(wsi);
break;
case LWS_CALLBACK_PROTOCOL_INIT: /* per vhost */
if (v)
break;
lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi),
lws_get_protocol(wsi),
sizeof(struct per_vhost_data__lws_server_status));
v = (struct per_vhost_data__lws_server_status *)
lws_protocol_vh_priv_get(lws_get_vhost(wsi),
lws_get_protocol(wsi));
fp_old = &v->fp;
while (pvo) {
if (!strcmp(pvo->name, "hide-vhosts"))
v->hide_vhosts = atoi(pvo->value);
if (!strcmp(pvo->name, "update-ms"))
period = atoi(pvo->value);
if (!strcmp(pvo->name, "filepath")) {
fp = malloc(sizeof(*fp));
fp->next = NULL;
lws_snprintf(&fp->filepath[0], sizeof(fp->filepath), "%s", pvo->value);
*fp_old = fp;
fp_old = &fp->next;
}
pvo = pvo->next;
}
v->context = lws_get_context(wsi);
uv_timer_init(lws_uv_getloop(v->context, 0), &v->timeout_watcher);
uv_timer_start(&v->timeout_watcher,
uv_timeout_cb_server_status, 2000, period);
break;
case LWS_CALLBACK_PROTOCOL_DESTROY: /* per vhost */
// lwsl_notice("ss: LWS_CALLBACK_PROTOCOL_DESTROY: v=%p, ctx=%p\n", v, v->context);
if (!v)
break;
uv_timer_stop(&v->timeout_watcher);
uv_close((uv_handle_t *)&v->timeout_watcher, NULL);
fp = v->fp;
while (fp) {
fp1= fp->next;
free(fp);
fp = fp1;
}
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
m = lws_write(wsi, (unsigned char *)v->d.buf + LWS_PRE,
v->d.length, LWS_WRITE_TEXT);
if (m < 0)
return -1;
break;
default:
break;
}
return 0;
}
static const struct lws_protocols protocols[] = {
{
"lws-server-status",
callback_lws_server_status,
sizeof(struct per_session_data__server_status),
1024,
},
};
LWS_EXTERN LWS_VISIBLE int
init_protocol_lws_server_status(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 = ARRAY_SIZE(protocols);
c->extensions = NULL;
c->count_extensions = 0;
return 0;
}
LWS_EXTERN LWS_VISIBLE int
destroy_protocol_lws_server_status(struct lws_context *context)
{
return 0;
}