| /*
* Sai web websrv - saiw SS client private UDS link to sais SS server
*
* Copyright (C) 2019 - 2020 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
*
* We copy JSON to heap and forward it in order to sais side.
*/
#include <libwebsockets.h>
#include <string.h>
#include <signal.h>
#include <time.h>
#include "w-private.h"
typedef struct saiw_websrv {
struct lws_ss_handle *ss;
void *opaque_data;
lws_struct_args_t a;
struct lejp_ctx ctx;
struct lws_buflist *wbltx;
} saiw_websrv_t;
extern const lws_struct_map_t lsm_schema_json_map[];
extern size_t lsm_schema_json_map_array_size;
enum {
SAIS_WS_WEBSRV_RX_TASKCHANGE,
SAIS_WS_WEBSRV_RX_EVENTCHANGE,
SAIS_WS_WEBSRV_RX_SAI_BUILDERS,
SAIS_WS_WEBSRV_RX_OVERVIEW, /* deleted or added event */
SAIS_WS_WEBSRV_RX_TASKLOGS, /* new logs for task (ratelimited) */
SAIS_WS_WEBSRV_RX_LOADREPORT, /* builder's cpu load report */
SAIS_WS_WEBSRV_RX_TASKACTIVITY,
};
/*
* This allows other parts of sai-web to queue a raw buffer to be sent to
* all connected browsers, eg, for load reports.
*
* The flags are lws_write() flags.
*/
void
saiw_ws_broadcast_raw(struct vhd *vhd, const void *buf, size_t len, unsigned int api_ver_min, enum lws_write_protocol flags)
{
int eff = 0;
lws_start_foreach_dll(struct lws_dll2 *, p, vhd->browsers.head) {
struct pss *pss = lws_container_of(p, struct pss, same);
int *pi = (int *)((const char *)buf - sizeof(int));
eff++;
*pi = (int)flags;
if (lws_buflist_append_segment(&pss->raw_tx, buf - sizeof(int), len + sizeof(int)) < 0)
lwsl_wsi_err(pss->wsi, "unable to buflist_append"); /* still ask to drain */
lws_callback_on_writable(pss->wsi);
} lws_end_foreach_dll(p);
}
/*
* Queue messages to send from sai-web to sai-server
*/
int
saiw_websrv_queue_tx(struct lws_ss_handle *h, void *buf, size_t len, unsigned int ss_flags)
{
saiw_websrv_t *m = (saiw_websrv_t *)lws_ss_to_user_object(h);
unsigned int *pi = (unsigned int *)((const char *)buf - sizeof(int));
*pi = ss_flags;
// lwsl_ss_notice(h, "sai-web: Queuing sai-web -> sai-server");
// lwsl_hexdump_notice(buf, len);
if (lws_buflist_append_segment(&m->wbltx, buf - sizeof(int), len + sizeof(int)) < 0)
lwsl_ss_err(h, "failed to append"); /* still ask to drain */
if (lws_ss_request_tx(h))
lwsl_ss_err(h, "failed to request tx");
return 0;
}
/*
* sai-web is receiving from sai-server
*
* This may come in chunks and is statefully parsed
* so it's not directly sensitive to size or fragmentation
*/
static int
saiw_lp_rx(void *userobj, const uint8_t *buf, size_t len, int flags)
{
saiw_websrv_t *m = (saiw_websrv_t *)userobj;
struct vhd *vhd = (struct vhd *)m->opaque_data;
sai_browse_rx_evinfo_t *ei;
int n;
// lwsl_warn("%s: len %d, flags %d\n", __func__, (int)len, flags);
// lwsl_hexdump_notice(buf, len);
if (flags & LWSSS_FLAG_SOM) {
/* First fragment of a new message. Clear old parse results and init. */
lwsac_free(&m->a.ac);
memset(&m->a, 0, sizeof(m->a));
m->a.map_st[0] = lsm_schema_json_map;
m->a.map_entries_st[0] = lsm_schema_json_map_array_size;
m->a.ac_block_size = 4096;
lws_struct_json_init_parse(&m->ctx, NULL, &m->a);
}
// fprintf(stderr, "%s: rx: %.*s\n", __func__, (int)len, buf);
n = lejp_parse(&m->ctx, (uint8_t *)buf, (int)len);
/* Check for fatal error OR completion without an object */
if (n < 0 && n != LEJP_CONTINUE) {
lwsl_notice("%s: srv->web JSON decode failed '%s' (ssflags %d)\n",
__func__, lejp_error_to_string(n), flags);
lwsl_hexdump_notice(buf, len);
goto cleanup_and_disconnect;
}
if (n == LEJP_CONTINUE) {
/*
* Also forward this fragment to browsers if the message is for them.
* We can check the schema index which is available after the
* "schema" member is parsed, even on the first fragment.
*/
switch (m->a.top_schema_index) {
case SAIS_WS_WEBSRV_RX_LOADREPORT:
saiw_ws_broadcast_raw(vhd, buf, len, 0,
lws_write_ws_flags(LWS_WRITE_TEXT, flags & LWSSS_FLAG_SOM, 0));
break;
case SAIS_WS_WEBSRV_RX_TASKACTIVITY:
saiw_ws_broadcast_raw(vhd, buf, len, 0,
lws_write_ws_flags(LWS_WRITE_TEXT, flags & LWSSS_FLAG_SOM, 0));
break;
}
return 0;
}
/*
* If we get here, the message is fully parsed (n >= 0).
* Now we can safely process m->a.dest.
*/
if (!m->a.dest) {
lwsl_warn("%s: JSON parsed but produced no object\n", __func__);
goto cleanup_parse_allocs;
}
switch (m->a.top_schema_index) {
case SAIS_WS_WEBSRV_RX_TASKCHANGE:
ei = (sai_browse_rx_evinfo_t *)m->a.dest;
lwsl_notice("%s: TASKCHANGE %s\n", __func__, ei->event_hash);
saiw_browsers_task_state_change(vhd, ei->event_hash);
break;
case SAIS_WS_WEBSRV_RX_EVENTCHANGE:
ei = (sai_browse_rx_evinfo_t *)m->a.dest;
lwsl_notice("%s: EVENTCHANGE %s\n", __func__, ei->event_hash);
saiw_event_state_change(vhd, ei->event_hash);
break;
case SAIS_WS_WEBSRV_RX_SAI_BUILDERS:
lwsac_free(&vhd->builders);
lws_dll2_owner_clear(&vhd->builders_owner);
vhd->builders = m->a.ac;
m->a.ac = NULL; /* The vhd now owns this memory */
/* Move the parsed objects to the vhd's list */
lws_start_foreach_dll_safe(struct lws_dll2 *, p, p1,
((sai_plat_owner_t *)m->a.dest)->plat_owner.head) {
sai_plat_t *cb = lws_container_of(p, sai_plat_t, sai_plat_list);
lws_dll2_remove(&cb->sai_plat_list);
lws_dll2_add_tail(&cb->sai_plat_list, &vhd->builders_owner);
} lws_end_foreach_dll_safe(p, p1);
/* schedule emitting the builder summary to each browser */
lws_start_foreach_dll(struct lws_dll2 *, p, vhd->browsers.head) {
struct pss *pss = lws_container_of(p, struct pss, same);
saiw_alloc_sched(pss, WSS_PREPARE_BUILDER_SUMMARY);
} lws_end_foreach_dll(p);
break;
case SAIS_WS_WEBSRV_RX_OVERVIEW:
lwsl_notice("%s: force overview\n", __func__);
lws_start_foreach_dll(struct lws_dll2 *, p, vhd->browsers.head) {
struct pss *pss = lws_container_of(p, struct pss, same);
saiw_alloc_sched(pss, WSS_PREPARE_OVERVIEW);
} lws_end_foreach_dll(p);
break;
case SAIS_WS_WEBSRV_RX_TASKLOGS:
ei = (sai_browse_rx_evinfo_t *)m->a.dest;
lws_start_foreach_dll(struct lws_dll2 *, p, vhd->subs_owner.head) {
struct pss *pss = lws_container_of(p, struct pss, subs_list);
if (!strcmp(pss->sub_task_uuid, ei->event_hash))
lws_callback_on_writable(pss->wsi);
} lws_end_foreach_dll(p);
break;
case SAIS_WS_WEBSRV_RX_LOADREPORT:
// lwsl_notice("%s: ^^^^^^^^^^^^^^ SAIS_WS_WEBSRV_RX_LOADREPORT forwarding to browser\n", __func__);
// lwsl_hexdump_notice(buf, len);
saiw_ws_broadcast_raw(vhd, buf, len - (unsigned int)n, 0,
lws_write_ws_flags(LWS_WRITE_TEXT, flags & LWSSS_FLAG_SOM, flags & LWSSS_FLAG_EOM));
break;
case SAIS_WS_WEBSRV_RX_TASKACTIVITY:
saiw_ws_broadcast_raw(vhd, buf, len - (unsigned int)n, 0,
lws_write_ws_flags(LWS_WRITE_TEXT, flags & LWSSS_FLAG_SOM, flags & LWSSS_FLAG_EOM));
break;
}
cleanup_parse_allocs:
/*
* Free the memory used for THIS parse.
* In the BUILDERS case, m->a.ac was transferred to vhd->builders,
* so it will be NULL here and lwsac_free is a no-op.
*/
lwsac_free(&m->a.ac);
return 0;
cleanup_and_disconnect:
lwsac_free(&m->a.ac);
return LWSSSSRET_DISCONNECT_ME;
}
static int
saiw_lp_tx(void *userobj, lws_ss_tx_ordinal_t ord, uint8_t *buf, size_t *len,
int *flags)
{
saiw_websrv_t *m = (saiw_websrv_t *)userobj;
int *pi = (int *)lws_buflist_get_frag_start_or_NULL(&m->wbltx), depi;
char som, som1, eom, final = 1;
size_t fsl, used;
if (!m->wbltx) {
lwsl_notice("%s: nothing to send from web -> srv\n", __func__);
return LWSSSSRET_TX_DONT_SEND;
}
depi = *pi;
/*
* We can only issue *len at a time.
*
* Notice we are getting the stored flags from the START of the fragment each time.
* that means we can still see the right flags stored with the fragment, even if we
* have partially used the buflist frag and are partway through it.
*
* Ergo, only something to skip if we are at som=1. And also notice that although
* *pi will be right, after the lws_buflist..._use() api, what it points to has been
* destroyed. So we also dereference *pi into depi for use below.
*/
fsl = lws_buflist_next_segment_len(&m->wbltx, NULL);
lws_buflist_fragment_use(&m->wbltx, NULL, 0, &som, &eom);
if (som) {
fsl -= sizeof(int);
lws_buflist_fragment_use(&m->wbltx, buf, sizeof(int), &som1, &eom);
}
/* this is the only buflist user on pss->raw_tx */
used = (size_t)lws_buflist_fragment_use(&m->wbltx, (uint8_t *)buf, *len, &som1, &eom);
if (!used)
return LWSSSSRET_TX_DONT_SEND;
if (used < fsl || (depi & LWS_WRITE_NO_FIN))
final = 0;
*len = used;
*flags = (som ? LWSSS_FLAG_SOM : 0) | (final ? LWSSS_FLAG_EOM : 0);
// lwsl_ss_notice(m->ss, "Sending %d web->srv: ssflags %d", (int)*len, (int)*flags);
// lwsl_hexdump_notice(buf, *len);
if (m->wbltx)
return lws_ss_request_tx(m->ss);
return 0;
}
static int
saiw_lp_state(void *userobj, void *sh, lws_ss_constate_t state,
lws_ss_tx_ordinal_t ack)
{
saiw_websrv_t *m = (saiw_websrv_t *)userobj;
struct vhd *vhd = (struct vhd *)m->opaque_data;
lwsl_info("%s: %s, ord 0x%x\n", __func__, lws_ss_state_name((int)state),
(unsigned int)ack);
switch (state) {
case LWSSSCS_DESTROYING:
break;
case LWSSSCS_CONNECTED:
lwsl_info("%s: connected to websrv uds\n", __func__);
return lws_ss_request_tx(m->ss);
case LWSSSCS_DISCONNECTED:
lws_buflist_destroy_all_segments(&m->wbltx);
lwsac_detach(&vhd->builders);
break;
case LWSSSCS_ALL_RETRIES_FAILED:
return lws_ss_client_connect(m->ss);
case LWSSSCS_QOS_ACK_REMOTE:
break;
default:
break;
}
return 0;
}
const lws_ss_info_t ssi_saiw_websrv = {
.handle_offset = offsetof(saiw_websrv_t, ss),
.opaque_user_data_offset = offsetof(saiw_websrv_t, opaque_data),
.rx = saiw_lp_rx,
.tx = saiw_lp_tx,
.state = saiw_lp_state,
.user_alloc = sizeof(saiw_websrv_t),
.streamtype = "websrv"
};
|