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/*
* Copyright (C) Igor Sysoev
* Copyright (C) NGINX, Inc.
*/
#include <math.h>
#include <nxt_router.h>
#include <nxt_http.h>
#include <nxt_upstream.h>
struct nxt_upstream_round_robin_server_s {
nxt_sockaddr_t *sockaddr;
int32_t current_weight;
int32_t effective_weight;
int32_t weight;
uint8_t protocol;
};
struct nxt_upstream_round_robin_s {
uint32_t items;
nxt_upstream_round_robin_server_t server[0];
};
static nxt_upstream_t *nxt_upstream_round_robin_joint_create(
nxt_router_temp_conf_t *tmcf, nxt_upstream_t *upstream);
static void nxt_upstream_round_robin_server_get(nxt_task_t *task,
nxt_upstream_server_t *us);
static const nxt_upstream_server_proto_t nxt_upstream_round_robin_proto = {
.joint_create = nxt_upstream_round_robin_joint_create,
.get = nxt_upstream_round_robin_server_get,
};
nxt_int_t
nxt_upstream_round_robin_create(nxt_task_t *task, nxt_router_temp_conf_t *tmcf,
nxt_conf_value_t *upstream_conf, nxt_upstream_t *upstream)
{
double total, k, w;
size_t size;
uint32_t i, n, next, wt;
nxt_mp_t *mp;
nxt_str_t name;
nxt_sockaddr_t *sa;
nxt_conf_value_t *servers_conf, *srvcf, *wtcf;
nxt_upstream_round_robin_t *urr;
static const nxt_str_t servers = nxt_string("servers");
static const nxt_str_t weight = nxt_string("weight");
mp = tmcf->router_conf->mem_pool;
servers_conf = nxt_conf_get_object_member(upstream_conf, &servers, NULL);
n = nxt_conf_object_members_count(servers_conf);
total = 0.0;
next = 0;
for (i = 0; i < n; i++) {
srvcf = nxt_conf_next_object_member(servers_conf, &name, &next);
wtcf = nxt_conf_get_object_member(srvcf, &weight, NULL);
w = (wtcf != NULL) ? nxt_conf_get_number(wtcf) : 1;
total += w;
}
/*
* This prevents overflow of int32_t
* in nxt_upstream_round_robin_server_get().
*/
k = (total == 0) ? 0 : (NXT_INT32_T_MAX / 2) / total;
if (isinf(k)) {
k = 1;
}
size = sizeof(nxt_upstream_round_robin_t)
+ n * sizeof(nxt_upstream_round_robin_server_t);
urr = nxt_mp_zalloc(mp, size);
if (nxt_slow_path(urr == NULL)) {
return NXT_ERROR;
}
urr->items = n;
next = 0;
for (i = 0; i < n; i++) {
srvcf = nxt_conf_next_object_member(servers_conf, &name, &next);
sa = nxt_sockaddr_parse(mp, &name);
if (nxt_slow_path(sa == NULL)) {
return NXT_ERROR;
}
sa->type = SOCK_STREAM;
urr->server[i].sockaddr = sa;
urr->server[i].protocol = NXT_HTTP_PROTO_H1;
wtcf = nxt_conf_get_object_member(srvcf, &weight, NULL);
w = (wtcf != NULL) ? k * nxt_conf_get_number(wtcf) : k;
wt = (w > 1 || w == 0) ? round(w) : 1;
urr->server[i].weight = wt;
urr->server[i].effective_weight = wt;
}
upstream->proto = &nxt_upstream_round_robin_proto;
upstream->type.round_robin = urr;
return NXT_OK;
}
static nxt_upstream_t *
nxt_upstream_round_robin_joint_create(nxt_router_temp_conf_t *tmcf,
nxt_upstream_t *upstream)
{
size_t size;
uint32_t i, n;
nxt_mp_t *mp;
nxt_upstream_t *u;
nxt_upstream_round_robin_t *urr, *urrcf;
mp = tmcf->router_conf->mem_pool;
u = nxt_mp_alloc(mp, sizeof(nxt_upstream_t));
if (nxt_slow_path(u == NULL)) {
return NULL;
}
*u = *upstream;
urrcf = upstream->type.round_robin;
size = sizeof(nxt_upstream_round_robin_t)
+ urrcf->items * sizeof(nxt_upstream_round_robin_server_t);
urr = nxt_mp_alloc(mp, size);
if (nxt_slow_path(urr == NULL)) {
return NULL;
}
u->type.round_robin = urr;
n = urrcf->items;
urr->items = n;
for (i = 0; i < n; i++) {
urr->server[i] = urrcf->server[i];
}
return u;
}
static void
nxt_upstream_round_robin_server_get(nxt_task_t *task, nxt_upstream_server_t *us)
{
int32_t total;
uint32_t i, n;
nxt_upstream_round_robin_t *round_robin;
nxt_upstream_round_robin_server_t *s, *best;
best = NULL;
total = 0;
round_robin = us->upstream->type.round_robin;
s = round_robin->server;
n = round_robin->items;
for (i = 0; i < n; i++) {
s[i].current_weight += s[i].effective_weight;
total += s[i].effective_weight;
if (s[i].effective_weight < s[i].weight) {
s[i].effective_weight++;
}
if (best == NULL || s[i].current_weight > best->current_weight) {
best = &s[i];
}
}
if (best == NULL || total == 0) {
us->state->error(task, us);
return;
}
best->current_weight -= total;
us->sockaddr = best->sockaddr;
us->protocol = best->protocol;
us->server.round_robin = best;
us->state->ready(task, us);
}
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