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ngx_supervisord.c
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/*
* Copyright (c) 2009-2010, FRiCKLE Piotr Sikora <info@frickle.com>
* All rights reserved.
*
* This project was fully funded by megiteam.pl.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY FRiCKLE PIOTR SIKORA AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL FRiCKLE PIOTR
* SIKORA OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_http.h>
#include <ngx_supervisord.h>
#include <nginx.h>
#if (NGX_HTTP_UPSTREAM_INIT_BUSY_PATCH_VERSION != 1)
#error "ngx_supervisord requires NGX_HTTP_UPSTREAM_INIT_BUSY_PATCH v1"
#endif
#define NGX_SUPERVISORD_MONITOR_INTERVAL 10000
#define NGX_SUPERVISORD_QUEUE_INTERVAL 500
#define NGX_SUPERVISORD_LOAD_SKIP 6
#define NGX_SUPERVISORD_ANTISPAM 30000
void *ngx_supervisord_create_srv_conf(ngx_conf_t *);
void *ngx_supervisord_create_loc_conf(ngx_conf_t *);
ngx_int_t ngx_supervisord_preconf(ngx_conf_t *);
char *ngx_supervisord_conf(ngx_conf_t *, ngx_command_t *, void *);
char *ngx_supervisord_conf_name(ngx_conf_t *, ngx_command_t *, void *);
char *ngx_supervisord_conf_inherit_backend_status(ngx_conf_t *,
ngx_command_t *, void *);
char *ngx_supervisord_conf_start_handler(ngx_conf_t *, ngx_command_t *,
void *);
char *ngx_supervisord_conf_stop_handler(ngx_conf_t *, ngx_command_t *,
void *);
ngx_int_t ngx_supervisord_module_init(ngx_cycle_t *);
ngx_int_t ngx_supervisord_worker_init(ngx_cycle_t *);
void ngx_supervisord_monitor(ngx_event_t *);
void ngx_supervisord_queue_monitor(ngx_event_t *);
void ngx_supervisord_finalize_request(ngx_http_request_t *, ngx_int_t);
const char *ngx_supervisord_get_command(ngx_uint_t);
typedef struct {
ngx_url_t server;
ngx_str_t userpass; /* user:pass format */
ngx_str_t name;
ngx_int_t is_fake;
} ngx_supervisord_conf_t;
typedef struct {
ngx_supervisord_conf_t supervisord;
ngx_http_upstream_srv_conf_t *uscf; /* original uscf */
ngx_int_t inherit_backend_status;
/* memory */
ngx_shm_zone_t *shm;
ngx_pool_t *lpool; /* local memory pool */
ngx_slab_pool_t *shpool; /* shared memory pool */
/* backends */
ngx_uint_t nservers; /* number of servers */
ngx_uint_t aservers; /* number of active servers */
ngx_uint_t *lservers; /* local servers list */
ngx_uint_t *shservers; /* shared servers list */
ngx_uint_t *dservers; /* local diff between lists */
/* monitors */
ngx_supervisord_backend_pt backend_monitor;
ngx_supervisord_load_pt load_monitor;
ngx_uint_t load_skip;
/* misc */
ngx_msec_t *last_cmd; /* shared */
ngx_uint_t *total_reqs; /* shared */
ngx_uint_t total_reported;
ngx_queue_t queue;
ngx_event_t queue_timer;
} ngx_supervisord_srv_conf_t;
typedef struct {
ngx_http_upstream_srv_conf_t *upstream;
ngx_uint_t command;
} ngx_supervisord_loc_conf_t;
typedef struct {
ngx_uint_t command;
ngx_uint_t backend;
} ngx_supervisord_ctx_t;
typedef struct {
ngx_supervisord_srv_conf_t *supcf;
ngx_http_request_t *request;
ngx_uint_t command;
ngx_uint_t backend;
ngx_supervisord_checker_pt checker;
} ngx_supervisord_queued_cmd_t;
typedef struct {
ngx_http_request_t *request;
ngx_queue_t queue;
} ngx_supervisord_queued_req_t;
static ngx_command_t ngx_supervisord_module_commands[] = {
{ ngx_string("supervisord"),
NGX_HTTP_UPS_CONF|NGX_CONF_TAKE12,
ngx_supervisord_conf,
0,
0,
NULL },
{ ngx_string("supervisord_name"),
NGX_HTTP_UPS_CONF|NGX_CONF_TAKE1,
ngx_supervisord_conf_name,
0,
0,
NULL },
{ ngx_string("supervisord_inherit_backend_status"),
NGX_HTTP_UPS_CONF|NGX_CONF_NOARGS,
ngx_supervisord_conf_inherit_backend_status,
0,
0,
NULL },
{ ngx_string("supervisord_start"),
NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_supervisord_conf_start_handler,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("supervisord_stop"),
NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_supervisord_conf_stop_handler,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_supervisord_module_ctx = {
ngx_supervisord_preconf, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
ngx_supervisord_create_srv_conf, /* create server configuration */
NULL, /* merge server configuration */
ngx_supervisord_create_loc_conf, /* create location configuration */
NULL /* merge location configuration */
};
/* cheap hack, but sadly we need it */
ngx_module_t ngx_http_copy_filter_module;
ngx_module_t ngx_supervisord_module = {
NGX_MODULE_V1,
&ngx_supervisord_module_ctx, /* module context */
ngx_supervisord_module_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
ngx_supervisord_module_init, /* init module */
ngx_supervisord_worker_init, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
/*
* configuration & initialization
*/
ngx_array_t *ngx_supervisord_upstreams;
ngx_event_t *ngx_supervisord_timer;
void *
ngx_supervisord_create_srv_conf(ngx_conf_t *cf)
{
ngx_supervisord_srv_conf_t *supcf;
supcf = ngx_pcalloc(cf->pool, sizeof(ngx_supervisord_srv_conf_t));
if (supcf == NULL) {
return NGX_CONF_ERROR;
}
return supcf;
}
void *
ngx_supervisord_create_loc_conf(ngx_conf_t *cf)
{
ngx_supervisord_loc_conf_t *suplcf;
suplcf = ngx_pcalloc(cf->pool, sizeof(ngx_supervisord_loc_conf_t));
if (suplcf == NULL) {
return NGX_CONF_ERROR;
}
return suplcf;
}
ngx_int_t
ngx_supervisord_preconf(ngx_conf_t *cf)
{
ngx_supervisord_upstreams = ngx_array_create(cf->pool, 8,
sizeof(ngx_supervisord_srv_conf_t *));
if (ngx_supervisord_upstreams == NULL) {
return NGX_ERROR;
}
ngx_supervisord_timer = ngx_pcalloc(cf->pool, sizeof(ngx_event_t));
if (ngx_supervisord_timer == NULL) {
return NGX_ERROR;
}
return NGX_OK;
}
ngx_int_t
ngx_supervisord_shm_init(ngx_shm_zone_t *shm, void *data)
{
ngx_supervisord_srv_conf_t *supcf, *osupcf;
if (data) {
osupcf = data;
if (osupcf->shservers != NULL) {
ngx_slab_free(osupcf->shpool, osupcf->shservers);
}
if (osupcf->total_reqs != NULL) {
ngx_slab_free(osupcf->shpool, osupcf->total_reqs);
}
if (osupcf->last_cmd != NULL) {
ngx_slab_free(osupcf->shpool, osupcf->last_cmd);
}
}
supcf = shm->data;
supcf->shpool = (ngx_slab_pool_t *) shm->shm.addr;
return NGX_OK;
}
char *
ngx_supervisord_conf(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_str_t *value = cf->args->elts;
ngx_http_upstream_srv_conf_t *uscf;
ngx_supervisord_srv_conf_t *supcf;
ngx_supervisord_srv_conf_t **supcfp;
ngx_connection_t *dummy;
uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module);
supcf = ngx_http_conf_get_module_srv_conf(cf, ngx_supervisord_module);
supcf->uscf = uscf; /* original uscf */
supcf->lpool = cf->pool;
if (supcf->supervisord.server.url.data != NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"supervisord already set to \"%V\"",
&supcf->supervisord.server.url);
return NGX_CONF_ERROR;
}
if (supcf->supervisord.is_fake) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"supervisord already set to \"none\"");
return NGX_CONF_ERROR;
}
if (ngx_strncmp(value[1].data, "none", 4) == 0) {
supcf->supervisord.is_fake = 1;
} else {
supcf->supervisord.server.url = value[1];
if (ngx_parse_url(cf->pool, &supcf->supervisord.server) != NGX_OK) {
if (supcf->supervisord.server.err) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"%s in supervisord \"%V\"",
supcf->supervisord.server.err,
&supcf->supervisord.server.url);
}
return NGX_CONF_ERROR;
}
if (cf->args->nelts == 3) {
supcf->supervisord.userpass = value[2];
}
}
supcf->shm = ngx_shared_memory_add(cf, &uscf->host, 4 * ngx_pagesize,
&ngx_supervisord_module);
if (supcf->shm == NULL) {
return NGX_CONF_ERROR;
}
supcf->shm->init = ngx_supervisord_shm_init;
supcf->shm->data = supcf;
ngx_queue_init(&supcf->queue);
dummy = ngx_pcalloc(cf->pool, sizeof(ngx_connection_t));
if (dummy == NULL) {
return NGX_CONF_ERROR;
}
dummy->fd = (ngx_socket_t) -1;
dummy->data = supcf;
supcf->queue_timer.log = ngx_cycle->log;
supcf->queue_timer.data = dummy;
supcf->queue_timer.handler = ngx_supervisord_queue_monitor;
supcfp = ngx_array_push(ngx_supervisord_upstreams);
if (supcfp == NULL) {
return NGX_CONF_ERROR;
}
*supcfp = supcf;
return NGX_CONF_OK;
}
char *
ngx_supervisord_conf_name(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_str_t *value = cf->args->elts;
ngx_supervisord_srv_conf_t *supcf;
supcf = ngx_http_conf_get_module_srv_conf(cf, ngx_supervisord_module);
if (supcf->supervisord.name.data != NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"supervisord_name already set to \"%V\"", &supcf->supervisord.name);
return NGX_CONF_ERROR;
}
supcf->supervisord.name = value[1];
return NGX_CONF_OK;
}
char *
ngx_supervisord_conf_inherit_backend_status(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf)
{
ngx_supervisord_srv_conf_t *supcf;
supcf = ngx_http_conf_get_module_srv_conf(cf, ngx_supervisord_module);
supcf->inherit_backend_status = 1;
return NGX_CONF_OK;
}
ngx_int_t
ngx_supervisord_module_init(ngx_cycle_t *cycle)
{
ngx_supervisord_srv_conf_t **supcfp;
ngx_http_upstream_server_t *server;
ngx_uint_t i, n;
size_t size;
supcfp = ngx_supervisord_upstreams->elts;
for (i = 0; i < ngx_supervisord_upstreams->nelts; i++) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, cycle->log, 0,
"[supervisord] upstream: %V, initializing",
&supcfp[i]->uscf->host);
supcfp[i]->nservers = supcfp[i]->uscf->servers->nelts;
size = supcfp[i]->nservers * sizeof(ngx_uint_t);
supcfp[i]->lservers = ngx_pcalloc(supcfp[i]->lpool, size);
if (supcfp[i]->lservers == NULL) {
return NGX_ERROR;
}
if (supcfp[i]->inherit_backend_status) {
server = supcfp[i]->uscf->servers->elts;
for (n = 0; n < supcfp[i]->nservers; n++) {
supcfp[i]->lservers[n] = server[n].down;
if (!server[n].down) {
supcfp[i]->aservers++;
}
}
} else {
for (n = 0; n < supcfp[i]->nservers; n++) {
supcfp[i]->lservers[n] = NGX_SUPERVISORD_SRV_DOWN;
}
}
if (supcfp[i]->backend_monitor != NULL) {
for (n = 0; n < supcfp[i]->nservers; n++) {
supcfp[i]->backend_monitor(supcfp[i]->uscf, n,
supcfp[i]->lservers[n]);
}
}
supcfp[i]->dservers = ngx_pcalloc(supcfp[i]->lpool, size);
if (supcfp[i]->dservers == NULL) {
return NGX_ERROR;
}
ngx_shmtx_lock(&supcfp[i]->shpool->mutex);
supcfp[i]->shservers = ngx_slab_alloc_locked(supcfp[i]->shpool, size);
if (supcfp[i]->shservers == NULL) {
goto failed;
}
for (n = 0; n < supcfp[i]->nservers; n++) {
supcfp[i]->shservers[n] = supcfp[i]->lservers[n];
}
supcfp[i]->total_reqs = ngx_slab_alloc_locked(supcfp[i]->shpool,
sizeof(ngx_uint_t));
if (supcfp[i]->total_reqs == NULL) {
goto failed;
}
*supcfp[i]->total_reqs = 0;
supcfp[i]->last_cmd = ngx_slab_alloc_locked(supcfp[i]->shpool,
sizeof(ngx_msec_t));
if (supcfp[i]->last_cmd == NULL) {
goto failed;
}
*supcfp[i]->last_cmd = 0;
ngx_shmtx_unlock(&supcfp[i]->shpool->mutex);
}
return NGX_OK;
failed:
ngx_shmtx_unlock(&supcfp[i]->shpool->mutex);
return NGX_ERROR;
}
ngx_int_t
ngx_supervisord_worker_init(ngx_cycle_t *cycle)
{
ngx_connection_t *dummy;
#if (nginx_version >= 8028)
if (ngx_process > NGX_PROCESS_WORKER) {
#else
/*
* This is really cheap hack, but it's the only way
* to distinguish "workers" from "cache manager"
* and "cache loader" without additional patch.
*
* NOTE: "worker_connections" cannot be set to 512!
*/
if (cycle->connection_n == 512) {
#endif
/* work only on real worker processes */
return NGX_OK;
}
if (ngx_supervisord_upstreams->nelts == 0) {
/* nothing to do */
return NGX_OK;
}
dummy = ngx_pcalloc(ngx_supervisord_upstreams->pool,
sizeof(ngx_connection_t));
if (dummy == NULL) {
return NGX_ERROR;
}
dummy->fd = (ngx_socket_t) -1;
dummy->data = ngx_supervisord_upstreams;
ngx_supervisord_timer->log = ngx_cycle->log;
ngx_supervisord_timer->data = dummy;
ngx_supervisord_timer->handler = ngx_supervisord_monitor;
ngx_add_timer(ngx_supervisord_timer, NGX_SUPERVISORD_MONITOR_INTERVAL);
return NGX_OK;
}
/*
* sync, monitors, etc.
*/
void
ngx_supervisord_sync_servers(ngx_supervisord_srv_conf_t *supcf)
{
ngx_uint_t i;
ngx_shmtx_lock(&supcf->shpool->mutex);
for (i = 0; i < supcf->nservers; i++) {
if (supcf->lservers[i] != supcf->shservers[i]) {
supcf->lservers[i] = supcf->shservers[i];
supcf->dservers[i] = 1;
}
}
ngx_shmtx_unlock(&supcf->shpool->mutex);
supcf->aservers = 0;
for (i = 0; i < supcf->nservers; i++) {
if (supcf->lservers[i] == NGX_SUPERVISORD_SRV_UP) {
supcf->aservers++;
}
if (supcf->dservers[i]) {
supcf->dservers[i] = 0;
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"[supervisord] upstream: %V, backend: %ui, new status: %ui",
&supcf->uscf->host, i, supcf->lservers[i]);
if (supcf->backend_monitor != NULL) {
supcf->backend_monitor(supcf->uscf, i, supcf->lservers[i]);
}
}
}
}
void
ngx_supervisord_sync_load(ngx_supervisord_srv_conf_t *supcf)
{
ngx_supervisord_load_t report;
ngx_uint_t curr, load;
ngx_int_t diff;
ngx_shmtx_lock(&supcf->shpool->mutex);
curr = *supcf->total_reqs;
ngx_shmtx_unlock(&supcf->shpool->mutex);
diff = curr - supcf->total_reported;
supcf->total_reported = curr;
if (diff < 0) {
/* overflow? */
return;
}
if ((diff == 0) || (supcf->aservers == 0)) {
load = 0;
} else {
/* load = requests per second per active backend */
load = ((diff * NGX_SUPERVISORD_LOAD_MULTIPLIER)
/ (((NGX_SUPERVISORD_MONITOR_INTERVAL * NGX_SUPERVISORD_LOAD_SKIP)
/ 1000) * supcf->aservers));
}
ngx_log_debug6(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"[supervisord] upstream: %V, load: %ui.%02ui, reqs: %i, up: %ui/%ui",
&supcf->uscf->host,
load / NGX_SUPERVISORD_LOAD_MULTIPLIER,
load % NGX_SUPERVISORD_LOAD_MULTIPLIER,
diff, supcf->aservers, supcf->nservers);
if (supcf->load_monitor != NULL) {
report.load = load;
report.reqs = diff;
report.aservers = supcf->aservers;
report.nservers = supcf->nservers;
report.interval = NGX_SUPERVISORD_MONITOR_INTERVAL
* NGX_SUPERVISORD_LOAD_SKIP;
supcf->load_monitor(supcf->uscf, report);
}
}
ngx_int_t
ngx_supervisord_resume_requests(ngx_supervisord_srv_conf_t *supcf)
{
ngx_supervisord_queued_req_t *qr;
ngx_http_request_t *or;
ngx_queue_t *q;
ngx_int_t rc;
if (ngx_queue_empty(&supcf->queue)) {
return NGX_OK;
}
ngx_supervisord_sync_servers(supcf);
if (supcf->lservers[0] > NGX_SUPERVISORD_SRV_DOWN) {
/* retry later, backend status still changing */
return NGX_BUSY;
}
rc = (supcf->lservers[0] == NGX_SUPERVISORD_SRV_UP)
? 0 : NGX_HTTP_BAD_GATEWAY;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"[supervisord] upstream: %V, resuming queued requests, rc: %i",
&supcf->uscf->host, rc);
while (!ngx_queue_empty(&supcf->queue)) {
q = ngx_queue_head(&supcf->queue);
qr = ngx_queue_data(q, ngx_supervisord_queued_req_t, queue);
or = qr->request;
ngx_queue_remove(q);
(void) ngx_pfree(supcf->lpool, qr);
if (rc == 0) {
/* resume processing */
ngx_http_upstream_connect(or, or->upstream);
} else {
/* remove cleanup, otherwise we end up with double free! */
if ((or->upstream) && (or->upstream->cleanup)) {
*or->upstream->cleanup = NULL;
}
ngx_http_finalize_request(or, rc);
}
}
return NGX_OK;
}
void
ngx_supervisord_monitor(ngx_event_t *ev)
{
ngx_connection_t *dummy = ev->data;
ngx_array_t *upstreams = dummy->data;
ngx_supervisord_srv_conf_t **supcfp;
ngx_uint_t i;
if (ngx_exiting) {
return;
}
supcfp = upstreams->elts;
for (i = 0; i < upstreams->nelts; i++) {
ngx_supervisord_sync_servers(supcfp[i]);
supcfp[i]->load_skip = ++supcfp[i]->load_skip
% NGX_SUPERVISORD_LOAD_SKIP;
if (supcfp[i]->load_skip == 0) {
ngx_supervisord_sync_load(supcfp[i]);
}
}
ngx_add_timer(ev, NGX_SUPERVISORD_MONITOR_INTERVAL);
}
void
ngx_supervisord_queue_monitor(ngx_event_t *ev)
{
ngx_connection_t *dummy = ev->data;
ngx_supervisord_srv_conf_t *supcf = dummy->data;
if (ngx_supervisord_resume_requests(supcf) == NGX_BUSY) {
ngx_add_timer(ev, NGX_SUPERVISORD_QUEUE_INTERVAL);
}
}
/*
* ngx_supervisord API
*/
ngx_http_request_t *ngx_supervisord_init(ngx_pool_t *,
ngx_http_upstream_srv_conf_t *);
ngx_int_t
ngx_supervisord_check_servers(ngx_http_request_t *or)
{
ngx_http_upstream_srv_conf_t *uscf;
ngx_supervisord_srv_conf_t *supcf;
ngx_supervisord_queued_req_t *qr;
ngx_uint_t tr;
ngx_int_t rc;
if ((or->upstream == NULL) || (or->upstream->conf == NULL)
|| (or->upstream->conf->upstream == NULL))
{
goto wrong_params;
}
uscf = ngx_http_get_module_srv_conf(or->upstream->conf->upstream,
ngx_http_upstream_module);
if (uscf == NULL) {
goto wrong_params;
}
supcf = ngx_http_conf_upstream_srv_conf(uscf, ngx_supervisord_module);
if (supcf == NULL) {
goto wrong_params;
}
if (!supcf->supervisord.is_fake
&& supcf->supervisord.server.url.data == NULL)
{
/*
* allow ngx_supervisord-enabled modules to work
* even when supervisord is not configured.
*/
return NGX_OK;
}
ngx_supervisord_sync_servers(supcf);
ngx_shmtx_lock(&supcf->shpool->mutex);
tr = ++(*supcf->total_reqs);
ngx_shmtx_unlock(&supcf->shpool->mutex);
ngx_log_debug4(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"[supervisord] upstream: %V, checking servers, up: %ui/%ui req#: %ui",
&supcf->uscf->host, supcf->aservers, supcf->nservers, tr);
if (supcf->aservers > 0 || supcf->supervisord.is_fake) {
return NGX_OK;
}
qr = ngx_pcalloc(supcf->lpool, sizeof(ngx_supervisord_queued_req_t));
if (qr == NULL) {
return NGX_ERROR;
}
qr->request = or;
if (supcf->lservers[0] == NGX_SUPERVISORD_SRV_STARTING_UP) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"[supervisord] upstream: %V, no alive backends, queuing request...",
&supcf->uscf->host);
/* add timer for first request queued on non-initializing process */
if (ngx_queue_empty(&supcf->queue)) {
ngx_add_timer(&supcf->queue_timer, NGX_SUPERVISORD_QUEUE_INTERVAL);
}
ngx_queue_insert_tail(&supcf->queue, &qr->queue);
} else {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"[supervisord] upstream: %V, no alive backends, starting one...",
&supcf->uscf->host);
ngx_queue_insert_tail(&supcf->queue, &qr->queue);
rc = ngx_supervisord_execute(uscf, NGX_SUPERVISORD_CMD_START, 0, NULL);
if (rc != NGX_OK) {
ngx_queue_remove(&qr->queue);
return rc;
}
}
return NGX_BUSY;
wrong_params:
ngx_log_error(NGX_LOG_EMERG, ngx_cycle->log, 0,
"[supervisord] wrong parameters passed to: %s", __func__);
return NGX_DECLINED;
}
void
ngx_supervisord_fake_execute(ngx_uint_t cmd, ngx_uint_t backend,
ngx_http_request_t *r)
{
ngx_supervisord_srv_conf_t *supcf;
ngx_supervisord_ctx_t *ctx;
supcf = ngx_http_get_module_srv_conf(r, ngx_supervisord_module);
ctx = ngx_http_get_module_ctx(r, ngx_supervisord_module);
ctx->command = cmd;
ctx->backend = backend;
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"[supervisord] upstream: %V, backend: %ui, command: %s",
&supcf->uscf->host, backend,
ngx_supervisord_get_command(cmd));
ngx_supervisord_finalize_request(r, 0);
}
void
ngx_supervisord_real_execute(ngx_uint_t cmd, ngx_uint_t backend,
ngx_http_request_t *r)
{
ngx_supervisord_ctx_t *ctx;
ctx = ngx_http_get_module_ctx(r, ngx_supervisord_module);
ctx->command = cmd;
ctx->backend = backend;
ngx_http_upstream_init(r);
}
void
ngx_supervisord_cmd_checker(ngx_event_t *ev)
{
ngx_connection_t *dummy = ev->data;
ngx_supervisord_queued_cmd_t *qcmd = dummy->data;
ngx_pool_t *pool;
ngx_int_t rc;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"[supervisord] upstream: %V, executing checker...",
&qcmd->supcf->uscf->host);
rc = qcmd->checker(qcmd->supcf->uscf, qcmd->backend);
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"[supervisord] upstream: %V, checker rc: %i",
&qcmd->supcf->uscf->host, rc);
if (rc != NGX_OK) {
ngx_add_timer(ev, NGX_SUPERVISORD_QUEUE_INTERVAL);
return;
}
if (qcmd->supcf->supervisord.is_fake) {
ngx_supervisord_fake_execute(qcmd->command, qcmd->backend,
qcmd->request);
} else {
ngx_supervisord_real_execute(qcmd->command, qcmd->backend,
qcmd->request);
}
pool = qcmd->supcf->lpool;
(void) ngx_pfree(pool, qcmd);
(void) ngx_pfree(pool, dummy);
(void) ngx_pfree(pool, ev);
}
ngx_int_t
ngx_supervisord_execute(ngx_http_upstream_srv_conf_t *uscf,
ngx_uint_t cmd, ngx_int_t backend, ngx_supervisord_checker_pt checker)
{
ngx_supervisord_srv_conf_t *supcf;
ngx_supervisord_queued_cmd_t *qcmd;
ngx_http_request_t *r;
ngx_connection_t *c, *dummy;
ngx_event_t *timer;
ngx_uint_t i;
ngx_int_t rc;
if (uscf == NULL) {
goto wrong_params;
}
supcf = ngx_http_conf_upstream_srv_conf(uscf, ngx_supervisord_module);
if (supcf == NULL) {
goto wrong_params;
}
if (!supcf->supervisord.is_fake
&& supcf->supervisord.server.url.data == NULL)
{
/*
* allow ngx_supervisord-enabled modules to work
* even when supervisord is not configured.
*/
return NGX_OK;
}
if ((backend >= (ngx_int_t) supcf->nservers) || (backend < -1)) {
goto wrong_params;
}
if (cmd > NGX_SUPERVISORD_CMD_STOP) {
goto wrong_params;
}
r = ngx_supervisord_init(supcf->lpool, uscf);
if (r == NULL) {
return NGX_ERROR;
}
ngx_shmtx_lock(&supcf->shpool->mutex);
if ((backend == -1)
&& (*supcf->last_cmd + NGX_SUPERVISORD_ANTISPAM > ngx_current_msec))
{
/* antispam for "-1" */
goto already_done;
}
switch (cmd) {
case NGX_SUPERVISORD_CMD_START:
if (backend == -1) {
for (i = 0; i < supcf->nservers; i++) {
if (supcf->shservers[i] == NGX_SUPERVISORD_SRV_STARTING_UP) {
/* "-1" allowed only when nothing happens */
goto already_done;
} else if (supcf->shservers[i] == NGX_SUPERVISORD_SRV_DOWN) {
backend = i;
break;
}
}
if (backend == -1) {
/* no available backends */
goto already_done;
}
} else if ((supcf->shservers[backend] == NGX_SUPERVISORD_SRV_UP)
|| (supcf->shservers[backend] == NGX_SUPERVISORD_SRV_STARTING_UP))
{
/* command already executed on this backend */
goto already_done;
}
supcf->shservers[backend] = NGX_SUPERVISORD_SRV_STARTING_UP;
*supcf->last_cmd = ngx_current_msec;
break;
case NGX_SUPERVISORD_CMD_STOP:
if (backend == -1) {
for (i = 0; i < supcf->nservers; i++) {
if (supcf->shservers[i] == NGX_SUPERVISORD_SRV_SHUTTING_DOWN) {
/* "-1" allowed only when nothing happens */
goto already_done;
} else if (supcf->shservers[i] == NGX_SUPERVISORD_SRV_UP) {
backend = i;
break;
}
}
if (backend == -1) {
/* no available backends */
goto already_done;
}
} else if ((supcf->shservers[backend] == NGX_SUPERVISORD_SRV_DOWN)
|| (supcf->shservers[backend] == NGX_SUPERVISORD_SRV_SHUTTING_DOWN))
{
/* command already executed on this backend */
goto already_done;
}
supcf->shservers[backend] = NGX_SUPERVISORD_SRV_SHUTTING_DOWN;
*supcf->last_cmd = ngx_current_msec;
break;
default:
ngx_shmtx_unlock(&supcf->shpool->mutex);
c = r->connection;
ngx_destroy_pool(r->pool);
ngx_destroy_pool(c->pool);
(void) ngx_pfree(supcf->lpool, c);
goto wrong_params;
}
ngx_shmtx_unlock(&supcf->shpool->mutex);
if (checker != NULL) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"[supervisord] upstream: %V, executing checker...",
&uscf->host);
rc = checker(uscf, (ngx_uint_t) backend);
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"[supervisord] upstream: %V, checker rc: %i",
&uscf->host, rc);
if (rc != NGX_OK) {
qcmd = ngx_pcalloc(supcf->lpool,
sizeof(ngx_supervisord_queued_cmd_t));
if (qcmd == NULL) {
return NGX_ERROR;
}
qcmd->supcf = supcf;
qcmd->request = r;
qcmd->command = cmd;
qcmd->backend = (ngx_uint_t) backend;
qcmd->checker = checker;
dummy = ngx_pcalloc(supcf->lpool, sizeof(ngx_connection_t));
if (dummy == NULL) {
return NGX_ERROR;
}