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ngx_zookeeper_upstream_module.c
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/*
* Copyright (C) 2018 Aleksei Konovkin ([email protected])
*/
#include <ngx_core.h>
#include <ngx_http.h>
#include <zookeeper/zookeeper.h>
#include "ngx_dynamic_upstream_module.h"
#include "ngx_zookeeper_upstream.h"
static void *
ngx_http_zookeeper_upstream_create_main_conf(ngx_conf_t *cf);
static void *
ngx_http_zookeeper_upstream_create_srv_conf(ngx_conf_t *cf);
static char *
ngx_http_zookeeper_upstream_log_level(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static ngx_int_t
ngx_http_zookeeper_upstream_post_conf(ngx_conf_t *cf);
ngx_int_t
ngx_http_zookeeper_upstream_init_worker(ngx_cycle_t *cycle);
void
ngx_http_zookeeper_upstream_exit_worker(ngx_cycle_t *cycle);
static char *
ngx_http_zookeeper_upstream_params(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
typedef struct
{
ngx_str_t hosts;
ngx_int_t timeout;
ZooLogLevel log_level;
ngx_array_t *exclude;
} ngx_http_zookeeper_upstream_main_conf_t;
typedef struct
{
ngx_array_t *path;
ngx_str_t lock;
ngx_str_t lock_path;
ngx_str_t file;
ngx_str_t params_tag;
ngx_str_t filter;
ngx_array_t *exclude;
ngx_http_upstream_srv_conf_t *uscf;
int epoch;
ngx_flag_t busy;
ngx_atomic_t rwlock;
ngx_dynamic_upstream_op_t defaults;
} ngx_http_zookeeper_upstream_srv_conf_t;
static char *
ngx_create_upsync_file(ngx_conf_t *cf, void *post, void *data);
static ngx_conf_post_t ngx_upsync_file_post = {
ngx_create_upsync_file
};
static ngx_conf_num_bounds_t ngx_http_zookeeper_check_timeout = {
ngx_conf_check_num_bounds,
1, 60000
};
static char *
zookeeper_sync_unlock(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static char *
zookeeper_sync_list(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static ngx_command_t ngx_http_zookeeper_upstream_commands[] = {
{ ngx_string("zookeeper_upstream"),
NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_HTTP_MAIN_CONF_OFFSET,
offsetof(ngx_http_zookeeper_upstream_main_conf_t, hosts),
NULL },
{ ngx_string("zookeeper_upstream_log_level"),
NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
ngx_http_zookeeper_upstream_log_level,
0,
0,
NULL },
{ ngx_string("zookeeper_upstream_recv_timeout"),
NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
ngx_conf_set_num_slot,
NGX_HTTP_MAIN_CONF_OFFSET,
offsetof(ngx_http_zookeeper_upstream_main_conf_t, timeout),
&ngx_http_zookeeper_check_timeout },
{ ngx_string("zookeeper_sync_path"),
NGX_HTTP_UPS_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_array_slot,
NGX_HTTP_SRV_CONF_OFFSET,
offsetof(ngx_http_zookeeper_upstream_srv_conf_t, path),
NULL },
{ ngx_string("zookeeper_sync_lock"),
NGX_HTTP_UPS_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_HTTP_SRV_CONF_OFFSET,
offsetof(ngx_http_zookeeper_upstream_srv_conf_t, lock),
NULL },
{ ngx_string("zookeeper_sync_file"),
NGX_HTTP_UPS_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_HTTP_SRV_CONF_OFFSET,
offsetof(ngx_http_zookeeper_upstream_srv_conf_t, file),
&ngx_upsync_file_post },
{ ngx_string("zookeeper_sync_params"),
NGX_HTTP_UPS_CONF|NGX_CONF_2MORE,
ngx_http_zookeeper_upstream_params,
NGX_HTTP_SRV_CONF_OFFSET,
0,
NULL },
{ ngx_string("zookeeper_sync_filter"),
NGX_HTTP_UPS_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_HTTP_SRV_CONF_OFFSET,
offsetof(ngx_http_zookeeper_upstream_srv_conf_t, filter),
NULL },
{ ngx_string("zookeeper_sync_exclude"),
NGX_HTTP_UPS_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_array_slot,
NGX_HTTP_SRV_CONF_OFFSET,
offsetof(ngx_http_zookeeper_upstream_srv_conf_t, exclude),
NULL },
{ ngx_string("zookeeper_sync_global_exclude"),
NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_array_slot,
NGX_HTTP_MAIN_CONF_OFFSET,
offsetof(ngx_http_zookeeper_upstream_main_conf_t, exclude),
NULL },
{ ngx_string("zookeeper_sync_unlock"),
NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
zookeeper_sync_unlock,
0,
0,
NULL },
{ ngx_string("zookeeper_sync_list"),
NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
zookeeper_sync_list,
0,
0,
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_zookeeper_upstream_ctx = {
NULL, /* preconfiguration */
ngx_http_zookeeper_upstream_post_conf, /* postconfiguration */
ngx_http_zookeeper_upstream_create_main_conf, /* create main */
NULL, /* init main */
ngx_http_zookeeper_upstream_create_srv_conf, /* create server */
NULL, /* merge server */
NULL, /* create location */
NULL /* merge location */
};
ngx_module_t ngx_zookeeper_upstream_module = {
NGX_MODULE_V1,
&ngx_zookeeper_upstream_ctx, /* module context */
ngx_http_zookeeper_upstream_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
ngx_http_zookeeper_upstream_init_worker, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
ngx_http_zookeeper_upstream_exit_worker, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static void *
ngx_http_zookeeper_upstream_create_main_conf(ngx_conf_t *cf)
{
ngx_http_zookeeper_upstream_main_conf_t *zmcf;
zmcf = ngx_pcalloc(cf->pool,
sizeof(ngx_http_zookeeper_upstream_main_conf_t));
if (zmcf == NULL)
return NULL;
zmcf->log_level = ZOO_LOG_LEVEL_ERROR;
zmcf->timeout = NGX_CONF_UNSET;
zmcf->exclude = ngx_array_create(cf->pool, 1, sizeof(ngx_str_t));
if (zmcf->exclude == NULL)
return NULL;
return zmcf;
}
static void *
ngx_http_zookeeper_upstream_create_srv_conf(ngx_conf_t *cf)
{
ngx_http_zookeeper_upstream_srv_conf_t *zscf;
zscf = ngx_pcalloc(cf->pool,
sizeof(ngx_http_zookeeper_upstream_srv_conf_t));
if (zscf == NULL)
return NULL;
ngx_str_set(&zscf->params_tag, "@params");
zscf->path = NGX_CONF_UNSET_PTR;
zscf->exclude = ngx_array_create(cf->pool, 1, sizeof(ngx_str_t));
if (zscf->exclude == NULL)
return NULL;
return zscf;
}
static void
str_trim(ngx_str_t *s)
{
while (s->len != 0 && isspace(*s->data)) {
s->data++;
s->len--;
}
while (s->len != 0 && isspace(*(s->data + s->len - 1)))
s->len--;
}
static ngx_flag_t
str_eq(ngx_str_t s1, ngx_str_t s2)
{
return ngx_memn2cmp(s1.data, s2.data, s1.len, s2.len) == 0;
}
static void
parse_token(ngx_dynamic_upstream_op_t *op,
ngx_str_t token)
{
ngx_str_t k, v;
static const ngx_str_t MAX_FAILS = ngx_string("max_fails");
static const ngx_str_t FAIL_TIMEOUT = ngx_string("fail_timeout");
static const ngx_str_t WEIGHT = ngx_string("weight");
static const ngx_str_t BACKUP = ngx_string("backup");
static const ngx_str_t DOWN = ngx_string("down");
#if defined(nginx_version) && (nginx_version >= 1011005)
static const ngx_str_t MAX_CONNS = ngx_string("max_conns");
#endif
k.data = token.data;
v.data = ngx_strlchr(token.data, token.data + token.len, '=');
if (v.data != NULL) {
k.len = v.data - k.data;
v.data++;
v.len = token.len - k.len - 1;
} else {
k.len = token.len;
v.len = 0;
}
str_trim(&k);
if (v.len)
str_trim(&v);
if (op->server.data == NULL) {
op->server = k;
return;
}
ngx_strlow(k.data, k.data, k.len);
if (str_eq(BACKUP, k)) {
op->backup = 1;
} else if (str_eq(DOWN, k)) {
op->down = 1;
op->op_param |= NGX_DYNAMIC_UPSTEAM_OP_PARAM_DOWN;
} else if (str_eq(MAX_FAILS, k)) {
op->max_fails = ngx_atoi(v.data, v.len);
op->op_param |= NGX_DYNAMIC_UPSTEAM_OP_PARAM_MAX_FAILS;
} else if (str_eq(FAIL_TIMEOUT, k)) {
op->fail_timeout = ngx_parse_time(&v, 0);
op->op_param |= NGX_DYNAMIC_UPSTEAM_OP_PARAM_FAIL_TIMEOUT;
} else if (str_eq(WEIGHT, k)) {
op->weight = ngx_atoi(v.data, v.len);
op->op_param |= NGX_DYNAMIC_UPSTEAM_OP_PARAM_WEIGHT;
}
#if defined(nginx_version) && (nginx_version >= 1011005)
else if (str_eq(MAX_CONNS, k)) {
op->max_conns = ngx_atoi(v.data, v.len);
op->op_param |= NGX_DYNAMIC_UPSTEAM_OP_PARAM_MAX_CONNS;
}
#endif
}
static void
parse_server(ngx_dynamic_upstream_op_t *op,
ngx_str_t *server)
{
/*
* format:
* attr:port weight=1 max_conns=1 max_fails=1 fail_timeout=1s backup
*/
u_char *s1, *s2;
ngx_str_t token;
for (s1 = s2 = server->data;
s2 < server->data + server->len;
s2++) {
if (isspace(*s2) || s2 == server->data + server->len - 1) {
token.data = s1;
token.len = s2 - s1;
if (s2 == server->data + server->len - 1)
token.len++;
parse_token(op, token);
while (s2 < server->data + server->len && isspace(*s2))
s2++;
s1 = s2;
}
}
}
static char *
ngx_http_zookeeper_upstream_params(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf)
{
ngx_http_zookeeper_upstream_srv_conf_t *zscf = conf;
ngx_str_t *elts;
ngx_uint_t j;
ngx_str_set(&zscf->defaults.server, "defaults");
elts = cf->args->elts;
zscf->params_tag = elts[1];
for (j = 2; j < cf->args->nelts; j++)
parse_token(&zscf->defaults, elts[j]);
return NGX_CONF_OK;
}
static char *
ngx_http_zookeeper_upstream_log_level(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf)
{
ngx_http_zookeeper_upstream_main_conf_t *zmcf = conf;
ngx_str_t log_level;
static const ngx_str_t LOG_ERR = ngx_string("error");
static const ngx_str_t LOG_INFO = ngx_string("warn");
static const ngx_str_t LOG_WARN = ngx_string("info");
static const ngx_str_t LOG_DEBUG = ngx_string("debug");
log_level = ((ngx_str_t *) cf->args->elts)[1];
ngx_strlow(log_level.data, log_level.data, log_level.len);
if (str_eq(LOG_ERR, log_level))
zmcf->log_level = ZOO_LOG_LEVEL_ERROR;
else if (str_eq(LOG_WARN, log_level))
zmcf->log_level = ZOO_LOG_LEVEL_WARN;
else if (str_eq(LOG_INFO, log_level))
zmcf->log_level = ZOO_LOG_LEVEL_INFO;
else if (str_eq(LOG_DEBUG, log_level))
zmcf->log_level = ZOO_LOG_LEVEL_DEBUG;
else {
ngx_log_error(NGX_LOG_ERR, cf->log, 0,
"invalid zookeeper_log_level value (error, warn, info, debug)");
return NGX_CONF_ERROR;
}
zoo_set_debug_level(zmcf->log_level);
return NGX_CONF_OK;
}
typedef struct
{
zhandle_t *handle;
ngx_flag_t connected;
const clientid_t *client_id;
ngx_flag_t expired;
int epoch;
} zookeeper_t;
static zookeeper_t zoo = {
.handle = NULL,
.connected = 0,
.client_id = NULL,
.expired = 1,
.epoch = 1
};
ngx_flag_t
ngx_zookeeper_upstream_connected()
{
return zoo.connected;
}
int
ngx_zookeeper_upstream_epoch()
{
return zoo.epoch;
}
void *
ngx_zookeeper_upstream_handle()
{
return zoo.handle;
}
static void
ngx_log_message(const char *s)
{
ngx_log_error(NGX_LOG_DEBUG, ngx_cycle->log, 0, s);
}
static void
initialize(volatile ngx_cycle_t *cycle);
static ngx_int_t
ngx_zookeeper_sync_upstreams();
static void
ngx_zookeeper_sync_handler(ngx_event_t *ev)
{
if (ngx_exiting || ngx_terminate || ngx_quit)
return;
if (zoo.expired) {
if (zoo.handle != NULL) {
zookeeper_close(zoo.handle);
zoo.handle = NULL;
zoo.client_id = 0;
}
initialize(ngx_cycle);
}
ngx_zookeeper_sync_upstreams();
ngx_add_timer(ev, 1000);
}
static void
session_watcher(zhandle_t *zh,
int type,
int state,
const char *path,
void* context);
static ngx_connection_t dumb_conn = {
.fd = -1
};
static ngx_event_t sync_ev = {
.handler = ngx_zookeeper_sync_handler,
.data = &dumb_conn,
.log = NULL,
.timedout = 0
};
static void
initialize(volatile ngx_cycle_t *cycle)
{
ngx_http_zookeeper_upstream_main_conf_t *zmcf;
zmcf = ngx_http_cycle_get_module_main_conf(cycle,
ngx_zookeeper_upstream_module);
zoo.handle = zookeeper_init2((const char *) zmcf->hosts.data,
session_watcher,
zmcf->timeout,
zoo.client_id,
0,
0,
ngx_log_message);
if (zoo.handle == NULL) {
u_char err[1024];
ngx_log_error(NGX_LOG_ERR, ngx_cycle->log, 0,
"Zookeeper upstream: error create zookeeper handle: %s",
ngx_strerror(errno, err, sizeof(err)));
return;
}
zoo.expired = 0;
ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
"Zookeeper upstream: connecting ...");
}
static void
session_watcher(zhandle_t *zh,
int type,
int state,
const char *path,
void* ctx)
{
if (type == ZOO_SESSION_EVENT) {
if (state == ZOO_CONNECTED_STATE) {
zoo.connected = 1;
zoo.client_id = zoo_client_id(zh);
zoo.epoch += 1;
ngx_log_error(NGX_LOG_INFO, ngx_cycle->log, 0,
"Zookeeper upstream: received a connected event");
} else if (state == ZOO_CONNECTING_STATE) {
if (zoo.connected) {
ngx_log_error(NGX_LOG_WARN, ngx_cycle->log, 0,
"Zookeeper upstream: disconnected");
}
zoo.connected = 0;
} else if (state == ZOO_EXPIRED_SESSION_STATE) {
if (zh != NULL) {
ngx_log_error(NGX_LOG_WARN, ngx_cycle->log, 0,
"Zookeeper upstream: session has been expired");
zoo.connected = 0;
zoo.expired = 1;
zoo.client_id = NULL;
}
}
}
}
static ngx_file_t
file_open(ngx_str_t *filename, int create, int mode)
{
ngx_file_t file;
file.name = *filename;
file.offset = 0;
file.fd = ngx_open_file(file.name.data, mode,
create, NGX_FILE_DEFAULT_ACCESS);
return file;
}
static char *
ngx_create_upsync_file(ngx_conf_t *cf, void *post, void *data)
{
ngx_str_t *filename = (ngx_str_t *) data;
ngx_file_t file;
static const ngx_str_t
default_server = ngx_string("server 0.0.0.0:1 down;");
if (ngx_conf_full_name(cf->cycle, filename, 1) != NGX_OK)
return NGX_CONF_ERROR;
file = file_open(filename, NGX_FILE_OPEN, NGX_FILE_RDONLY);
if (file.fd != NGX_INVALID_FILE)
goto done;
file = file_open(filename, NGX_FILE_CREATE_OR_OPEN, NGX_FILE_WRONLY);
if (file.fd == NGX_INVALID_FILE) {
ngx_log_error(NGX_LOG_ERR, cf->log, ngx_errno,
ngx_open_file_n " \"%V\" failed", filename);
return NGX_CONF_ERROR;
}
file.log = cf->log;
if (ngx_write_file(&file, default_server.data, default_server.len, 0)
== NGX_ERROR) {
ngx_close_file(file.fd);
return NGX_CONF_ERROR;
}
done:
ngx_close_file(file.fd);
return ngx_conf_include(cf, NULL, NULL);
}
static void
ngx_zookeeper_upstream_save(ngx_http_zookeeper_upstream_srv_conf_t *zscf)
{
ngx_http_upstream_rr_peer_t *peer;
ngx_http_upstream_rr_peers_t *peers, *primary;
ngx_uint_t j = 0;
ngx_file_t file;
ngx_pool_t *pool;
ngx_array_t *servers;
ngx_str_t *server, *s;
ngx_uint_t i;
u_char *start, *end, *last;
static const ngx_str_t
default_server = ngx_string("server 0.0.0.0:1 down;");
static const ngx_str_t noaddr = ngx_string("0.0.0.0:1");
pool = ngx_create_pool(2048, ngx_cycle->log);
if (pool == NULL) {
ngx_log_error(NGX_LOG_WARN, ngx_cycle->log, 0,
"Zookeeper upstream: no memory");
return;
}
primary = zscf->uscf->peer.data;
ngx_rwlock_rlock(&primary->rwlock);
start = (u_char *) ngx_palloc(pool, ngx_pagesize);
if (start == NULL)
goto nomem;
end = start + ngx_pagesize;
file.name = zscf->file;
file.offset = 0;
file.fd = ngx_open_file(zscf->file.data, NGX_FILE_WRONLY,
NGX_FILE_TRUNCATE, NGX_FILE_DEFAULT_ACCESS);
if (file.fd == NGX_INVALID_FILE) {
ngx_rwlock_unlock(&primary->rwlock);
ngx_log_error(NGX_LOG_ERR, ngx_cycle->log, ngx_errno,
ngx_open_file_n " \"%V\" failed", &zscf->file);
return;
}
servers = ngx_array_create(pool, 100, sizeof(ngx_str_t));
if (servers == NULL)
goto nomem;
server = servers->elts;
for (peers = primary;
peers && j < 2;
peers = peers->next, j++) {
for (peer = peers->peer;
peer;
peer = peer->next) {
if (str_eq(noaddr, peer->name) && !str_eq(noaddr, peer->server))
continue;
for (i = 0; i < servers->nelts; i++)
if (str_eq(peer->server, server[i]))
// already saved
break;
if (i == servers->nelts) {
s = ngx_array_push(servers);
if (s == NULL)
goto nomem;
ngx_memcpy(s, &peer->server, sizeof(ngx_str_t));
last = ngx_snprintf(start, end - start,
"server %V"
" max_conns=%d"
" max_fails=%d"
" fail_timeout=%d"
" weight=%d",
&peer->server,
peer->max_conns,
peer->max_fails,
peer->fail_timeout,
peer->weight);
if (zscf->defaults.down)
last = ngx_snprintf(last, end - last, " down");
if (j == 1)
last = ngx_snprintf(last, end - last, " backup");
last = ngx_snprintf(last, end - last, ";\n");
if (ngx_write_file(&file, start, last - start, file.offset)
== NGX_ERROR)
goto fail;
}
}
}
if (file.offset != 0)
goto end;
if (ngx_write_file(&file, default_server.data, default_server.len, 0)
== NGX_ERROR)
goto fail;
end:
ngx_close_file(file.fd);
ngx_rwlock_unlock(&primary->rwlock);
return;
nomem:
ngx_log_error(NGX_LOG_WARN, ngx_cycle->log, 0,
"Zookeeper upstream: no memory");
goto end;
fail:
ngx_log_error(NGX_LOG_ERR, ngx_cycle->log, ngx_errno,
ngx_write_fd_n " \"%V\" failed", &zscf->file);
ngx_delete_file(zscf->file.data);
goto end;
}
static ngx_int_t
ngx_http_zookeeper_upstream_post_conf(ngx_conf_t *cf)
{
ngx_http_zookeeper_upstream_main_conf_t *zmcf;
zmcf = ngx_http_conf_get_module_main_conf(cf,
ngx_zookeeper_upstream_module);
ngx_conf_init_value(zmcf->timeout, 10000);
return NGX_OK;
}
ngx_int_t
ngx_http_zookeeper_upstream_init_worker(ngx_cycle_t *cycle)
{
ngx_http_zookeeper_upstream_main_conf_t *zmcf;
zmcf = ngx_http_cycle_get_module_main_conf(cycle,
ngx_zookeeper_upstream_module);
if (ngx_process != NGX_PROCESS_WORKER && ngx_process != NGX_PROCESS_SINGLE)
return NGX_OK;
ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
"Zookeeper upstream: initialized");
if (zmcf == NULL || zmcf->hosts.len == 0)
return NGX_OK;
initialize(cycle);
sync_ev.log = cycle->log;
ngx_zookeeper_sync_handler(&sync_ev);
return NGX_OK;
}
void
ngx_http_zookeeper_upstream_exit_worker(ngx_cycle_t *cycle)
{
if (zoo.handle == NULL)
return;
zoo.connected = 0;
zookeeper_close(zoo.handle);
zoo.handle = NULL;
ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
"Zookeeper upstream: destroyed");
}
static void
ngx_zookeeper_op_defaults(ngx_dynamic_upstream_op_t *op,
ngx_str_t *upstream, ngx_str_t *server, ngx_str_t *name, int operation,
ngx_dynamic_upstream_op_t *defaults)
{
ngx_memcpy(op, defaults, sizeof(ngx_dynamic_upstream_op_t));
ngx_str_null(&op->server);
op->op = operation;
op->err = "unknown";
op->status = NGX_HTTP_OK;
op->down = 1;
op->op_param |= NGX_DYNAMIC_UPSTEAM_OP_PARAM_RESOLVE_SYNC;
parse_server(op, server);
if (!op->down) {
op->op_param |= NGX_DYNAMIC_UPSTEAM_OP_PARAM_UP;
op->up = 1;
}
if (name != NULL) {
op->name.data = name->data;
op->name.len = name->len;
}
op->upstream.data = upstream->data;
op->upstream.len = upstream->len;
server->len = op->server.len;
}
static void
ngx_zookeeper_op_defaults_locked(ngx_dynamic_upstream_op_t *op,
ngx_str_t *upstream, ngx_str_t *server, ngx_str_t *name, int operation,
ngx_dynamic_upstream_op_t *defaults)
{
ngx_zookeeper_op_defaults(op, upstream, server, name,
operation, defaults);
op->no_lock = 1;
}
static void
ngx_zookeeper_remove_obsoleted(ngx_http_zookeeper_upstream_srv_conf_t *zscf,
ngx_array_t *names)
{
ngx_http_upstream_rr_peer_t *peer;
ngx_http_upstream_rr_peers_t *peers, *primary = zscf->uscf->peer.data;
ngx_uint_t i, j;
ngx_dynamic_upstream_op_t op;
ngx_str_t *elts = names->elts;
ngx_rwlock_wlock(&primary->rwlock);
for (peers = primary, j = 0;
peers && j < 2;
peers = peers->next, j++) {
for (peer = peers->peer;
peer;
peer = peer->next) {
for (i = 0; i < names->nelts; i++)
if (str_eq(peer->server, elts[i]))
break;
if (i != names->nelts)
continue;
ngx_zookeeper_op_defaults_locked(&op, &zscf->uscf->host,
&peer->server, &peer->name, NGX_DYNAMIC_UPSTEAM_OP_REMOVE,
&zscf->defaults);
if (ngx_dynamic_upstream_op(ngx_cycle->log, &op, zscf->uscf)
== NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, ngx_cycle->log, 0,
"Zookeeper upstream: [%V] %s",
&op.upstream, op.err);
}
}
}
ngx_rwlock_unlock(&primary->rwlock);
}
static ngx_int_t
ngx_zookeeper_sync_update(ngx_http_zookeeper_upstream_srv_conf_t *zscf);
static void
ngx_zookeeper_sync_watch(zhandle_t *zh, int type,
int state, const char *path, void *ctx)
{
ngx_http_zookeeper_upstream_srv_conf_t *zscf = ctx;
if (type == ZOO_CHILD_EVENT
|| type == ZOO_CHANGED_EVENT
|| type == ZOO_DELETED_EVENT) {
if (ngx_exiting || ngx_quit || ngx_terminate)
return;
ngx_log_error(NGX_LOG_INFO, ngx_cycle->log, 0,
"Zookeeper upstream: [%V] changed", &zscf->uscf->host);
zscf->epoch = 0;
ngx_zookeeper_sync_update(zscf);
}
}
typedef struct {
ngx_pool_t *pool;
ngx_str_t path;
ngx_http_zookeeper_upstream_srv_conf_t *zscf;
ngx_atomic_t *count;
ngx_array_t *names;
ngx_uint_t errors;
} ngx_zookeeper_path_ctx_t;
typedef struct {
u_char node[1024];
ngx_pool_t *pool;
ngx_str_t *server;
ngx_zookeeper_path_ctx_t *path;
} ngx_zookeeper_node_ctx_t;
static ngx_array_t *
parse_body(ngx_pool_t *pool, const char *body, int len)
{
char *s1, *s2;
ngx_array_t *a;
ngx_str_t *name;
a = ngx_array_create(pool, 2, sizeof(ngx_str_t));
if (a == NULL)
return NULL;
if (body == NULL)