
Adds a new api lws_vhost_destroy(struct lws_vhost *) which allows dynamic removal of vhosts. The external api calls two parts of internal helpers that get reused for context destroy. The second part is called deferred by 5s... this is to ensure that event library objects composed into structs owned by the vhost all have a chance to complete their close asynchronously. That should happen immediately, but it requires us to return to the event loop first. The vhost being removed is deleted from the context vhost list by the first part, and does not block further removals or creation during the delay for the deferred freeing of the vhost memory. Part 1: - if the vhost owned a listen socket needed by other vhosts listening on same iface + port, the listen socket is first handed off to another vhost so it stays alive - all wsi still open on the vhost are forcibly closed (including any listen socket still attached) - inform all active protocols on the vhost they should destroy themselves - remove vhost from context vhost list (can no longer be found by incoming connections) - add to a "being destroyed" context list and schedule the second part to be called in 5s Part 2: - remove us from the being destroyed list - free all allocations owned by the vhost - zero down the vhost and free the vhost itself In libwebsockets-test-server, you can send it a SIGUSR1 to have it toggle the creation and destruction of a second vhost on port + 1.
167 lines
4.2 KiB
C
167 lines
4.2 KiB
C
/*
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* ws protocol handler plugin for "dumb increment"
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*
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* Copyright (C) 2010-2016 Andy Green <andy@warmcat.com>
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*
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* This file is made available under the Creative Commons CC0 1.0
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* Universal Public Domain Dedication.
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*
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* The person who associated a work with this deed has dedicated
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* the work to the public domain by waiving all of his or her rights
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* to the work worldwide under copyright law, including all related
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* and neighboring rights, to the extent allowed by law. You can copy,
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* modify, distribute and perform the work, even for commercial purposes,
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* all without asking permission.
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*
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* These test plugins are intended to be adapted for use in your code, which
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* may be proprietary. So unlike the library itself, they are licensed
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* Public Domain.
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*/
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#if !defined (LWS_PLUGIN_STATIC)
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#define LWS_DLL
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#define LWS_INTERNAL
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#include "../lib/libwebsockets.h"
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#endif
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#include <string.h>
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#if defined(LWS_WITH_ESP8266)
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#define DUMB_PERIOD 50
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#else
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#define DUMB_PERIOD 50
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#endif
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struct per_vhost_data__dumb_increment {
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uv_timer_t timeout_watcher;
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struct lws_context *context;
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struct lws_vhost *vhost;
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const struct lws_protocols *protocol;
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};
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struct per_session_data__dumb_increment {
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int number;
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};
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static void
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uv_timeout_cb_dumb_increment(uv_timer_t *w
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#if UV_VERSION_MAJOR == 0
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, int status
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#endif
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)
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{
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struct per_vhost_data__dumb_increment *vhd = lws_container_of(w,
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struct per_vhost_data__dumb_increment, timeout_watcher);
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lws_callback_on_writable_all_protocol_vhost(vhd->vhost, vhd->protocol);
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}
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static int
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callback_dumb_increment(struct lws *wsi, enum lws_callback_reasons reason,
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void *user, void *in, size_t len)
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{
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struct per_session_data__dumb_increment *pss =
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(struct per_session_data__dumb_increment *)user;
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struct per_vhost_data__dumb_increment *vhd =
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(struct per_vhost_data__dumb_increment *)
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lws_protocol_vh_priv_get(lws_get_vhost(wsi),
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lws_get_protocol(wsi));
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unsigned char buf[LWS_PRE + 20];
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unsigned char *p = &buf[LWS_PRE];
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int n, m;
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switch (reason) {
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case LWS_CALLBACK_PROTOCOL_INIT:
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vhd = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi),
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lws_get_protocol(wsi),
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sizeof(struct per_vhost_data__dumb_increment));
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vhd->context = lws_get_context(wsi);
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vhd->protocol = lws_get_protocol(wsi);
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vhd->vhost = lws_get_vhost(wsi);
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uv_timer_init(lws_uv_getloop(vhd->context, 0),
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&vhd->timeout_watcher);
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uv_timer_start(&vhd->timeout_watcher,
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uv_timeout_cb_dumb_increment, DUMB_PERIOD, DUMB_PERIOD);
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break;
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case LWS_CALLBACK_PROTOCOL_DESTROY:
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if (!vhd)
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break;
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lwsl_notice("di: LWS_CALLBACK_PROTOCOL_DESTROY: v=%p, ctx=%p\n", vhd, vhd->context);
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uv_timer_stop(&vhd->timeout_watcher);
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uv_close((uv_handle_t *)&vhd->timeout_watcher, NULL);
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break;
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case LWS_CALLBACK_ESTABLISHED:
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pss->number = 0;
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break;
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case LWS_CALLBACK_SERVER_WRITEABLE:
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n = lws_snprintf((char *)p, sizeof(buf) - LWS_PRE, "%d", pss->number++);
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m = lws_write(wsi, p, n, LWS_WRITE_TEXT);
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if (m < n) {
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lwsl_err("ERROR %d writing to di socket\n", n);
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return -1;
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}
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break;
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case LWS_CALLBACK_RECEIVE:
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if (len < 6)
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break;
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if (strcmp((const char *)in, "reset\n") == 0)
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pss->number = 0;
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if (strcmp((const char *)in, "closeme\n") == 0) {
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lwsl_notice("dumb_inc: closing as requested\n");
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lws_close_reason(wsi, LWS_CLOSE_STATUS_GOINGAWAY,
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(unsigned char *)"seeya", 5);
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return -1;
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}
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break;
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default:
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break;
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}
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return 0;
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}
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#define LWS_PLUGIN_PROTOCOL_DUMB_INCREMENT \
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{ \
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"dumb-increment-protocol", \
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callback_dumb_increment, \
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sizeof(struct per_session_data__dumb_increment), \
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10, /* rx buf size must be >= permessage-deflate rx size */ \
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}
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#if !defined (LWS_PLUGIN_STATIC)
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static const struct lws_protocols protocols[] = {
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LWS_PLUGIN_PROTOCOL_DUMB_INCREMENT
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};
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LWS_EXTERN LWS_VISIBLE int
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init_protocol_dumb_increment(struct lws_context *context,
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struct lws_plugin_capability *c)
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{
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if (c->api_magic != LWS_PLUGIN_API_MAGIC) {
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lwsl_err("Plugin API %d, library API %d", LWS_PLUGIN_API_MAGIC,
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c->api_magic);
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return 1;
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}
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c->protocols = protocols;
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c->count_protocols = ARRAY_SIZE(protocols);
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c->extensions = NULL;
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c->count_extensions = 0;
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return 0;
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}
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LWS_EXTERN LWS_VISIBLE int
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destroy_protocol_dumb_increment(struct lws_context *context)
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{
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return 0;
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}
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#endif
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