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nginx / nginx / nginx-1.0.12 / . / src / http / ngx_http_upstream.c
blob: d4f50a3685e0f750150a6d8cac0ca7bb8874c57c [file] [log] [blame]
/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#if (NGX_HTTP_CACHE)
static ngx_int_t ngx_http_upstream_cache(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static ngx_int_t ngx_http_upstream_cache_send(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static ngx_int_t ngx_http_upstream_cache_status(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
#endif
static void ngx_http_upstream_init_request(ngx_http_request_t *r);
static void ngx_http_upstream_resolve_handler(ngx_resolver_ctx_t *ctx);
static void ngx_http_upstream_rd_check_broken_connection(ngx_http_request_t *r);
static void ngx_http_upstream_wr_check_broken_connection(ngx_http_request_t *r);
static void ngx_http_upstream_check_broken_connection(ngx_http_request_t *r,
ngx_event_t *ev);
static void ngx_http_upstream_connect(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static ngx_int_t ngx_http_upstream_reinit(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static void ngx_http_upstream_send_request(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static void ngx_http_upstream_send_request_handler(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static void ngx_http_upstream_process_header(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static ngx_int_t ngx_http_upstream_test_next(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static ngx_int_t ngx_http_upstream_intercept_errors(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static ngx_int_t ngx_http_upstream_test_connect(ngx_connection_t *c);
static ngx_int_t ngx_http_upstream_process_headers(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static void ngx_http_upstream_process_body_in_memory(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static void ngx_http_upstream_send_response(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static void
ngx_http_upstream_process_non_buffered_downstream(ngx_http_request_t *r);
static void
ngx_http_upstream_process_non_buffered_upstream(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static void
ngx_http_upstream_process_non_buffered_request(ngx_http_request_t *r,
ngx_uint_t do_write);
static ngx_int_t ngx_http_upstream_non_buffered_filter_init(void *data);
static ngx_int_t ngx_http_upstream_non_buffered_filter(void *data,
ssize_t bytes);
static void ngx_http_upstream_process_downstream(ngx_http_request_t *r);
static void ngx_http_upstream_process_upstream(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static void ngx_http_upstream_process_request(ngx_http_request_t *r);
static void ngx_http_upstream_store(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static void ngx_http_upstream_dummy_handler(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static void ngx_http_upstream_next(ngx_http_request_t *r,
ngx_http_upstream_t *u, ngx_uint_t ft_type);
static void ngx_http_upstream_cleanup(void *data);
static void ngx_http_upstream_finalize_request(ngx_http_request_t *r,
ngx_http_upstream_t *u, ngx_int_t rc);
static ngx_int_t ngx_http_upstream_process_header_line(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_upstream_process_set_cookie(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t
ngx_http_upstream_process_cache_control(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_upstream_ignore_header_line(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_upstream_process_expires(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_upstream_process_accel_expires(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_upstream_process_limit_rate(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_upstream_process_buffering(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_upstream_process_charset(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_upstream_copy_header_line(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t
ngx_http_upstream_copy_multi_header_lines(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_upstream_copy_content_type(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_upstream_copy_content_length(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_upstream_copy_last_modified(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_upstream_rewrite_location(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_upstream_rewrite_refresh(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_upstream_copy_allow_ranges(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
#if (NGX_HTTP_GZIP)
static ngx_int_t ngx_http_upstream_copy_content_encoding(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
#endif
static ngx_int_t ngx_http_upstream_add_variables(ngx_conf_t *cf);
static ngx_int_t ngx_http_upstream_addr_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_upstream_status_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_upstream_response_time_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_upstream_response_length_variable(
ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data);
static char *ngx_http_upstream(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy);
static char *ngx_http_upstream_server(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static void *ngx_http_upstream_create_main_conf(ngx_conf_t *cf);
static char *ngx_http_upstream_init_main_conf(ngx_conf_t *cf, void *conf);
#if (NGX_HTTP_SSL)
static void ngx_http_upstream_ssl_init_connection(ngx_http_request_t *,
ngx_http_upstream_t *u, ngx_connection_t *c);
static void ngx_http_upstream_ssl_handshake(ngx_connection_t *c);
#endif
ngx_http_upstream_header_t ngx_http_upstream_headers_in[] = {
{ ngx_string("Status"),
ngx_http_upstream_process_header_line,
offsetof(ngx_http_upstream_headers_in_t, status),
ngx_http_upstream_copy_header_line, 0, 0 },
{ ngx_string("Content-Type"),
ngx_http_upstream_process_header_line,
offsetof(ngx_http_upstream_headers_in_t, content_type),
ngx_http_upstream_copy_content_type, 0, 1 },
{ ngx_string("Content-Length"),
ngx_http_upstream_process_header_line,
offsetof(ngx_http_upstream_headers_in_t, content_length),
ngx_http_upstream_copy_content_length, 0, 0 },
{ ngx_string("Date"),
ngx_http_upstream_process_header_line,
offsetof(ngx_http_upstream_headers_in_t, date),
ngx_http_upstream_copy_header_line,
offsetof(ngx_http_headers_out_t, date), 0 },
{ ngx_string("Last-Modified"),
ngx_http_upstream_process_header_line,
offsetof(ngx_http_upstream_headers_in_t, last_modified),
ngx_http_upstream_copy_last_modified, 0, 0 },
{ ngx_string("ETag"),
ngx_http_upstream_process_header_line,
offsetof(ngx_http_upstream_headers_in_t, etag),
ngx_http_upstream_copy_header_line,
offsetof(ngx_http_headers_out_t, etag), 0 },
{ ngx_string("Server"),
ngx_http_upstream_process_header_line,
offsetof(ngx_http_upstream_headers_in_t, server),
ngx_http_upstream_copy_header_line,
offsetof(ngx_http_headers_out_t, server), 0 },
{ ngx_string("WWW-Authenticate"),
ngx_http_upstream_process_header_line,
offsetof(ngx_http_upstream_headers_in_t, www_authenticate),
ngx_http_upstream_copy_header_line, 0, 0 },
{ ngx_string("Location"),
ngx_http_upstream_process_header_line,
offsetof(ngx_http_upstream_headers_in_t, location),
ngx_http_upstream_rewrite_location, 0, 0 },
{ ngx_string("Refresh"),
ngx_http_upstream_ignore_header_line, 0,
ngx_http_upstream_rewrite_refresh, 0, 0 },
{ ngx_string("Set-Cookie"),
ngx_http_upstream_process_set_cookie, 0,
ngx_http_upstream_copy_header_line, 0, 1 },
{ ngx_string("Content-Disposition"),
ngx_http_upstream_ignore_header_line, 0,
ngx_http_upstream_copy_header_line, 0, 1 },
{ ngx_string("Cache-Control"),
ngx_http_upstream_process_cache_control, 0,
ngx_http_upstream_copy_multi_header_lines,
offsetof(ngx_http_headers_out_t, cache_control), 1 },
{ ngx_string("Expires"),
ngx_http_upstream_process_expires, 0,
ngx_http_upstream_copy_header_line,
offsetof(ngx_http_headers_out_t, expires), 1 },
{ ngx_string("Accept-Ranges"),
ngx_http_upstream_process_header_line,
offsetof(ngx_http_upstream_headers_in_t, accept_ranges),
ngx_http_upstream_copy_allow_ranges,
offsetof(ngx_http_headers_out_t, accept_ranges), 1 },
{ ngx_string("Connection"),
ngx_http_upstream_ignore_header_line, 0,
ngx_http_upstream_ignore_header_line, 0, 0 },
{ ngx_string("Keep-Alive"),
ngx_http_upstream_ignore_header_line, 0,
ngx_http_upstream_ignore_header_line, 0, 0 },
{ ngx_string("X-Powered-By"),
ngx_http_upstream_ignore_header_line, 0,
ngx_http_upstream_copy_header_line, 0, 0 },
{ ngx_string("X-Accel-Expires"),
ngx_http_upstream_process_accel_expires, 0,
ngx_http_upstream_copy_header_line, 0, 0 },
{ ngx_string("X-Accel-Redirect"),
ngx_http_upstream_process_header_line,
offsetof(ngx_http_upstream_headers_in_t, x_accel_redirect),
ngx_http_upstream_copy_header_line, 0, 0 },
{ ngx_string("X-Accel-Limit-Rate"),
ngx_http_upstream_process_limit_rate, 0,
ngx_http_upstream_copy_header_line, 0, 0 },
{ ngx_string("X-Accel-Buffering"),
ngx_http_upstream_process_buffering, 0,
ngx_http_upstream_copy_header_line, 0, 0 },
{ ngx_string("X-Accel-Charset"),
ngx_http_upstream_process_charset, 0,
ngx_http_upstream_copy_header_line, 0, 0 },
#if (NGX_HTTP_GZIP)
{ ngx_string("Content-Encoding"),
ngx_http_upstream_process_header_line,
offsetof(ngx_http_upstream_headers_in_t, content_encoding),
ngx_http_upstream_copy_content_encoding, 0, 0 },
#endif
{ ngx_null_string, NULL, 0, NULL, 0, 0 }
};
static ngx_command_t ngx_http_upstream_commands[] = {
{ ngx_string("upstream"),
NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE1,
ngx_http_upstream,
0,
0,
NULL },
{ ngx_string("server"),
NGX_HTTP_UPS_CONF|NGX_CONF_1MORE,
ngx_http_upstream_server,
NGX_HTTP_SRV_CONF_OFFSET,
0,
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_upstream_module_ctx = {
ngx_http_upstream_add_variables, /* preconfiguration */
NULL, /* postconfiguration */
ngx_http_upstream_create_main_conf, /* create main configuration */
ngx_http_upstream_init_main_conf, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
NULL, /* create location configuration */
NULL /* merge location configuration */
};
ngx_module_t ngx_http_upstream_module = {
NGX_MODULE_V1,
&ngx_http_upstream_module_ctx, /* module context */
ngx_http_upstream_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static ngx_http_variable_t ngx_http_upstream_vars[] = {
{ ngx_string("upstream_addr"), NULL,
ngx_http_upstream_addr_variable, 0,
NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("upstream_status"), NULL,
ngx_http_upstream_status_variable, 0,
NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("upstream_response_time"), NULL,
ngx_http_upstream_response_time_variable, 0,
NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("upstream_response_length"), NULL,
ngx_http_upstream_response_length_variable, 0,
NGX_HTTP_VAR_NOCACHEABLE, 0 },
#if (NGX_HTTP_CACHE)
{ ngx_string("upstream_cache_status"), NULL,
ngx_http_upstream_cache_status, 0,
NGX_HTTP_VAR_NOCACHEABLE, 0 },
#endif
{ ngx_null_string, NULL, NULL, 0, 0, 0 }
};
static ngx_http_upstream_next_t ngx_http_upstream_next_errors[] = {
{ 500, NGX_HTTP_UPSTREAM_FT_HTTP_500 },
{ 502, NGX_HTTP_UPSTREAM_FT_HTTP_502 },
{ 503, NGX_HTTP_UPSTREAM_FT_HTTP_503 },
{ 504, NGX_HTTP_UPSTREAM_FT_HTTP_504 },
{ 404, NGX_HTTP_UPSTREAM_FT_HTTP_404 },
{ 0, 0 }
};
ngx_conf_bitmask_t ngx_http_upstream_cache_method_mask[] = {
{ ngx_string("GET"), NGX_HTTP_GET},
{ ngx_string("HEAD"), NGX_HTTP_HEAD },
{ ngx_string("POST"), NGX_HTTP_POST },
{ ngx_null_string, 0 }
};
ngx_conf_bitmask_t ngx_http_upstream_ignore_headers_masks[] = {
{ ngx_string("X-Accel-Redirect"), NGX_HTTP_UPSTREAM_IGN_XA_REDIRECT },
{ ngx_string("X-Accel-Expires"), NGX_HTTP_UPSTREAM_IGN_XA_EXPIRES },
{ ngx_string("X-Accel-Limit-Rate"), NGX_HTTP_UPSTREAM_IGN_XA_LIMIT_RATE },
{ ngx_string("X-Accel-Buffering"), NGX_HTTP_UPSTREAM_IGN_XA_BUFFERING },
{ ngx_string("X-Accel-Charset"), NGX_HTTP_UPSTREAM_IGN_XA_CHARSET },
{ ngx_string("Expires"), NGX_HTTP_UPSTREAM_IGN_EXPIRES },
{ ngx_string("Cache-Control"), NGX_HTTP_UPSTREAM_IGN_CACHE_CONTROL },
{ ngx_string("Set-Cookie"), NGX_HTTP_UPSTREAM_IGN_SET_COOKIE },
{ ngx_null_string, 0 }
};
ngx_int_t
ngx_http_upstream_create(ngx_http_request_t *r)
{
ngx_http_upstream_t *u;
u = r->upstream;
if (u && u->cleanup) {
r->main->count++;
ngx_http_upstream_cleanup(r);
}
u = ngx_pcalloc(r->pool, sizeof(ngx_http_upstream_t));
if (u == NULL) {
return NGX_ERROR;
}
r->upstream = u;
u->peer.log = r->connection->log;
u->peer.log_error = NGX_ERROR_ERR;
#if (NGX_THREADS)
u->peer.lock = &r->connection->lock;
#endif
#if (NGX_HTTP_CACHE)
r->cache = NULL;
#endif
return NGX_OK;
}
void
ngx_http_upstream_init(ngx_http_request_t *r)
{
ngx_connection_t *c;
c = r->connection;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http init upstream, client timer: %d", c->read->timer_set);
if (c->read->timer_set) {
ngx_del_timer(c->read);
}
if (ngx_event_flags & NGX_USE_CLEAR_EVENT) {
if (!c->write->active) {
if (ngx_add_event(c->write, NGX_WRITE_EVENT, NGX_CLEAR_EVENT)
== NGX_ERROR)
{
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
}
}
ngx_http_upstream_init_request(r);
}
static void
ngx_http_upstream_init_request(ngx_http_request_t *r)
{
ngx_str_t *host;
ngx_uint_t i;
ngx_resolver_ctx_t *ctx, temp;
ngx_http_cleanup_t *cln;
ngx_http_upstream_t *u;
ngx_http_core_loc_conf_t *clcf;
ngx_http_upstream_srv_conf_t *uscf, **uscfp;
ngx_http_upstream_main_conf_t *umcf;
if (r->aio) {
return;
}
u = r->upstream;
#if (NGX_HTTP_CACHE)
if (u->conf->cache) {
ngx_int_t rc;
rc = ngx_http_upstream_cache(r, u);
if (rc == NGX_BUSY) {
r->write_event_handler = ngx_http_upstream_init_request;
return;
}
r->write_event_handler = ngx_http_request_empty_handler;
if (rc == NGX_DONE) {
return;
}
if (rc != NGX_DECLINED) {
ngx_http_finalize_request(r, rc);
return;
}
}
#endif
u->store = (u->conf->store || u->conf->store_lengths);
if (!u->store && !r->post_action && !u->conf->ignore_client_abort) {
r->read_event_handler = ngx_http_upstream_rd_check_broken_connection;
r->write_event_handler = ngx_http_upstream_wr_check_broken_connection;
}
if (r->request_body) {
u->request_bufs = r->request_body->bufs;
}
if (u->create_request(r) != NGX_OK) {
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
u->peer.local = u->conf->local;
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
u->output.alignment = clcf->directio_alignment;
u->output.pool = r->pool;
u->output.bufs.num = 1;
u->output.bufs.size = clcf->client_body_buffer_size;
u->output.output_filter = ngx_chain_writer;
u->output.filter_ctx = &u->writer;
u->writer.pool = r->pool;
if (r->upstream_states == NULL) {
r->upstream_states = ngx_array_create(r->pool, 1,
sizeof(ngx_http_upstream_state_t));
if (r->upstream_states == NULL) {
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
} else {
u->state = ngx_array_push(r->upstream_states);
if (u->state == NULL) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
ngx_memzero(u->state, sizeof(ngx_http_upstream_state_t));
}
cln = ngx_http_cleanup_add(r, 0);
if (cln == NULL) {
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
cln->handler = ngx_http_upstream_cleanup;
cln->data = r;
u->cleanup = &cln->handler;
if (u->resolved == NULL) {
uscf = u->conf->upstream;
} else {
if (u->resolved->sockaddr) {
if (ngx_http_upstream_create_round_robin_peer(r, u->resolved)
!= NGX_OK)
{
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
ngx_http_upstream_connect(r, u);
return;
}
host = &u->resolved->host;
umcf = ngx_http_get_module_main_conf(r, ngx_http_upstream_module);
uscfp = umcf->upstreams.elts;
for (i = 0; i < umcf->upstreams.nelts; i++) {
uscf = uscfp[i];
if (uscf->host.len == host->len
&& ((uscf->port == 0 && u->resolved->no_port)
|| uscf->port == u->resolved->port)
&& ngx_memcmp(uscf->host.data, host->data, host->len) == 0)
{
goto found;
}
}
if (u->resolved->port == 0) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"no port in upstream \"%V\"", host);
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
temp.name = *host;
ctx = ngx_resolve_start(clcf->resolver, &temp);
if (ctx == NULL) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
if (ctx == NGX_NO_RESOLVER) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"no resolver defined to resolve %V", host);
ngx_http_upstream_finalize_request(r, u, NGX_HTTP_BAD_GATEWAY);
return;
}
ctx->name = *host;
ctx->type = NGX_RESOLVE_A;
ctx->handler = ngx_http_upstream_resolve_handler;
ctx->data = r;
ctx->timeout = clcf->resolver_timeout;
u->resolved->ctx = ctx;
if (ngx_resolve_name(ctx) != NGX_OK) {
u->resolved->ctx = NULL;
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
return;
}
found:
if (uscf->peer.init(r, uscf) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
ngx_http_upstream_connect(r, u);
}
#if (NGX_HTTP_CACHE)
static ngx_int_t
ngx_http_upstream_cache(ngx_http_request_t *r, ngx_http_upstream_t *u)
{
ngx_int_t rc;
ngx_http_cache_t *c;
c = r->cache;
if (c == NULL) {
if (!(r->method & u->conf->cache_methods)) {
return NGX_DECLINED;
}
if (r->method & NGX_HTTP_HEAD) {
u->method = ngx_http_core_get_method;
}
if (ngx_http_file_cache_new(r) != NGX_OK) {
return NGX_ERROR;
}
if (u->create_key(r) != NGX_OK) {
return NGX_ERROR;
}
/* TODO: add keys */
ngx_http_file_cache_create_key(r);
if (r->cache->header_start + 256 >= u->conf->buffer_size) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"%V_buffer_size %uz is not enough for cache key, "
"it should increased at least to %uz",
&u->conf->module, u->conf->buffer_size,
ngx_align(r->cache->header_start + 256, 1024));
r->cache = NULL;
return NGX_DECLINED;
}
u->cacheable = 1;
switch (ngx_http_test_predicates(r, u->conf->cache_bypass)) {
case NGX_ERROR:
return NGX_ERROR;
case NGX_DECLINED:
u->cache_status = NGX_HTTP_CACHE_BYPASS;
return NGX_DECLINED;
default: /* NGX_OK */
break;
}
c = r->cache;
c->min_uses = u->conf->cache_min_uses;
c->body_start = u->conf->buffer_size;
c->file_cache = u->conf->cache->data;
u->cache_status = NGX_HTTP_CACHE_MISS;
}
rc = ngx_http_file_cache_open(r);
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http upstream cache: %i", rc);
switch (rc) {
case NGX_HTTP_CACHE_UPDATING:
if (u->conf->cache_use_stale & NGX_HTTP_UPSTREAM_FT_UPDATING) {
u->cache_status = rc;
rc = NGX_OK;
} else {
rc = NGX_HTTP_CACHE_STALE;
}
break;
case NGX_OK:
u->cache_status = NGX_HTTP_CACHE_HIT;
}
switch (rc) {
case NGX_OK:
rc = ngx_http_upstream_cache_send(r, u);
if (rc != NGX_HTTP_UPSTREAM_INVALID_HEADER) {
return rc;
}
break;
case NGX_HTTP_CACHE_STALE:
c->valid_sec = 0;
u->buffer.start = NULL;
u->cache_status = NGX_HTTP_CACHE_EXPIRED;
break;
case NGX_DECLINED:
if ((size_t) (u->buffer.end - u->buffer.start) < u->conf->buffer_size) {
u->buffer.start = NULL;
} else {
u->buffer.pos = u->buffer.start + c->header_start;
u->buffer.last = u->buffer.pos;
}
break;
case NGX_HTTP_CACHE_SCARCE:
u->cacheable = 0;
break;
case NGX_AGAIN:
return NGX_BUSY;
case NGX_ERROR:
return NGX_ERROR;
default:
/* cached NGX_HTTP_BAD_GATEWAY, NGX_HTTP_GATEWAY_TIME_OUT, etc. */
u->cache_status = NGX_HTTP_CACHE_HIT;
return rc;
}
r->cached = 0;
return NGX_DECLINED;
}
static ngx_int_t
ngx_http_upstream_cache_send(ngx_http_request_t *r, ngx_http_upstream_t *u)
{
ngx_int_t rc;
ngx_http_cache_t *c;
r->cached = 1;
c = r->cache;
if (c->header_start == c->body_start) {
r->http_version = NGX_HTTP_VERSION_9;
return ngx_http_cache_send(r);
}
/* TODO: cache stack */
u->buffer = *c->buf;
u->buffer.pos += c->header_start;
ngx_memzero(&u->headers_in, sizeof(ngx_http_upstream_headers_in_t));
if (ngx_list_init(&u->headers_in.headers, r->pool, 8,
sizeof(ngx_table_elt_t))
!= NGX_OK)
{
return NGX_ERROR;
}
rc = u->process_header(r);
if (rc == NGX_OK) {
if (ngx_http_upstream_process_headers(r, u) != NGX_OK) {
return NGX_DONE;
}
return ngx_http_cache_send(r);
}
if (rc == NGX_ERROR) {
return NGX_ERROR;
}
/* rc == NGX_HTTP_UPSTREAM_INVALID_HEADER */
/* TODO: delete file */
return rc;
}
#endif
static void
ngx_http_upstream_resolve_handler(ngx_resolver_ctx_t *ctx)
{
ngx_http_request_t *r;
ngx_http_upstream_t *u;
ngx_http_upstream_resolved_t *ur;
r = ctx->data;
u = r->upstream;
ur = u->resolved;
if (ctx->state) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"%V could not be resolved (%i: %s)",
&ctx->name, ctx->state,
ngx_resolver_strerror(ctx->state));
ngx_http_upstream_finalize_request(r, u, NGX_HTTP_BAD_GATEWAY);
return;
}
ur->naddrs = ctx->naddrs;
ur->addrs = ctx->addrs;
#if (NGX_DEBUG)
{
in_addr_t addr;
ngx_uint_t i;
for (i = 0; i < ctx->naddrs; i++) {
addr = ntohl(ur->addrs[i]);
ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"name was resolved to %ud.%ud.%ud.%ud",
(addr >> 24) & 0xff, (addr >> 16) & 0xff,
(addr >> 8) & 0xff, addr & 0xff);
}
}
#endif
if (ngx_http_upstream_create_round_robin_peer(r, ur) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
ngx_resolve_name_done(ctx);
ur->ctx = NULL;
ngx_http_upstream_connect(r, u);
}
static void
ngx_http_upstream_handler(ngx_event_t *ev)
{
ngx_connection_t *c;
ngx_http_request_t *r;
ngx_http_log_ctx_t *ctx;
ngx_http_upstream_t *u;
c = ev->data;
r = c->data;
u = r->upstream;
c = r->connection;
ctx = c->log->data;
ctx->current_request = r;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http upstream request: \"%V?%V\"", &r->uri, &r->args);
if (ev->write) {
u->write_event_handler(r, u);
} else {
u->read_event_handler(r, u);
}
ngx_http_run_posted_requests(c);
}
static void
ngx_http_upstream_rd_check_broken_connection(ngx_http_request_t *r)
{
ngx_http_upstream_check_broken_connection(r, r->connection->read);
}
static void
ngx_http_upstream_wr_check_broken_connection(ngx_http_request_t *r)
{
ngx_http_upstream_check_broken_connection(r, r->connection->write);
}
static void
ngx_http_upstream_check_broken_connection(ngx_http_request_t *r,
ngx_event_t *ev)
{
int n;
char buf[1];
ngx_err_t err;
ngx_int_t event;
ngx_connection_t *c;
ngx_http_upstream_t *u;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, ev->log, 0,
"http upstream check client, write event:%d, \"%V\"",
ev->write, &r->uri);
c = r->connection;
u = r->upstream;
if (c->error) {
if ((ngx_event_flags & NGX_USE_LEVEL_EVENT) && ev->active) {
event = ev->write ? NGX_WRITE_EVENT : NGX_READ_EVENT;
if (ngx_del_event(ev, event, 0) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
}
if (!u->cacheable) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_CLIENT_CLOSED_REQUEST);
}
return;
}
#if (NGX_HAVE_KQUEUE)
if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
if (!ev->pending_eof) {
return;
}
ev->eof = 1;
c->error = 1;
if (ev->kq_errno) {
ev->error = 1;
}
if (!u->cacheable && u->peer.connection) {
ngx_log_error(NGX_LOG_INFO, ev->log, ev->kq_errno,
"kevent() reported that client prematurely closed "
"connection, so upstream connection is closed too");
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_CLIENT_CLOSED_REQUEST);
return;
}
ngx_log_error(NGX_LOG_INFO, ev->log, ev->kq_errno,
"kevent() reported that client prematurely closed "
"connection");
if (u->peer.connection == NULL) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_CLIENT_CLOSED_REQUEST);
}
return;
}
#endif
n = recv(c->fd, buf, 1, MSG_PEEK);
err = ngx_socket_errno;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ev->log, err,
"http upstream recv(): %d", n);
if (ev->write && (n >= 0 || err == NGX_EAGAIN)) {
return;
}
if ((ngx_event_flags & NGX_USE_LEVEL_EVENT) && ev->active) {
event = ev->write ? NGX_WRITE_EVENT : NGX_READ_EVENT;
if (ngx_del_event(ev, event, 0) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
}
if (n > 0) {
return;
}
if (n == -1) {
if (err == NGX_EAGAIN) {
return;
}
ev->error = 1;
} else { /* n == 0 */
err = 0;
}
ev->eof = 1;
c->error = 1;
if (!u->cacheable && u->peer.connection) {
ngx_log_error(NGX_LOG_INFO, ev->log, err,
"client prematurely closed connection, "
"so upstream connection is closed too");
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_CLIENT_CLOSED_REQUEST);
return;
}
ngx_log_error(NGX_LOG_INFO, ev->log, err,
"client prematurely closed connection");
if (u->peer.connection == NULL) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_CLIENT_CLOSED_REQUEST);
}
}
static void
ngx_http_upstream_connect(ngx_http_request_t *r, ngx_http_upstream_t *u)
{
ngx_int_t rc;
ngx_time_t *tp;
ngx_connection_t *c;
r->connection->log->action = "connecting to upstream";
r->connection->single_connection = 0;
if (u->state && u->state->response_sec) {
tp = ngx_timeofday();
u->state->response_sec = tp->sec - u->state->response_sec;
u->state->response_msec = tp->msec - u->state->response_msec;
}
u->state = ngx_array_push(r->upstream_states);
if (u->state == NULL) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
ngx_memzero(u->state, sizeof(ngx_http_upstream_state_t));
tp = ngx_timeofday();
u->state->response_sec = tp->sec;
u->state->response_msec = tp->msec;
rc = ngx_event_connect_peer(&u->peer);
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http upstream connect: %i", rc);
if (rc == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
u->state->peer = u->peer.name;
if (rc == NGX_BUSY) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "no live upstreams");
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_NOLIVE);
return;
}
if (rc == NGX_DECLINED) {
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR);
return;
}
/* rc == NGX_OK || rc == NGX_AGAIN */
c = u->peer.connection;
c->data = r;
c->write->handler = ngx_http_upstream_handler;
c->read->handler = ngx_http_upstream_handler;
u->write_event_handler = ngx_http_upstream_send_request_handler;
u->read_event_handler = ngx_http_upstream_process_header;
c->sendfile &= r->connection->sendfile;
u->output.sendfile = c->sendfile;
c->pool = r->pool;
c->log = r->connection->log;
c->read->log = c->log;
c->write->log = c->log;
/* init or reinit the ngx_output_chain() and ngx_chain_writer() contexts */
u->writer.out = NULL;
u->writer.last = &u->writer.out;
u->writer.connection = c;
u->writer.limit = 0;
if (u->request_sent) {
if (ngx_http_upstream_reinit(r, u) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
}
if (r->request_body
&& r->request_body->buf
&& r->request_body->temp_file
&& r == r->main)
{
/*
* the r->request_body->buf can be reused for one request only,
* the subrequests should allocate their own temporay bufs
*/
u->output.free = ngx_alloc_chain_link(r->pool);
if (u->output.free == NULL) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
u->output.free->buf = r->request_body->buf;
u->output.free->next = NULL;
u->output.allocated = 1;
r->request_body->buf->pos = r->request_body->buf->start;
r->request_body->buf->last = r->request_body->buf->start;
r->request_body->buf->tag = u->output.tag;
}
u->request_sent = 0;
if (rc == NGX_AGAIN) {
ngx_add_timer(c->write, u->conf->connect_timeout);
return;
}
#if (NGX_HTTP_SSL)
if (u->ssl && c->ssl == NULL) {
ngx_http_upstream_ssl_init_connection(r, u, c);
return;
}
#endif
ngx_http_upstream_send_request(r, u);
}
#if (NGX_HTTP_SSL)
static void
ngx_http_upstream_ssl_init_connection(ngx_http_request_t *r,
ngx_http_upstream_t *u, ngx_connection_t *c)
{
ngx_int_t rc;
if (ngx_ssl_create_connection(u->conf->ssl, c,
NGX_SSL_BUFFER|NGX_SSL_CLIENT)
!= NGX_OK)
{
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
c->sendfile = 0;
u->output.sendfile = 0;
if (u->conf->ssl_session_reuse) {
if (u->peer.set_session(&u->peer, u->peer.data) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
}
r->connection->log->action = "SSL handshaking to upstream";
rc = ngx_ssl_handshake(c);
if (rc == NGX_AGAIN) {
c->ssl->handler = ngx_http_upstream_ssl_handshake;
return;
}
ngx_http_upstream_ssl_handshake(c);
}
static void
ngx_http_upstream_ssl_handshake(ngx_connection_t *c)
{
ngx_http_request_t *r;
ngx_http_upstream_t *u;
r = c->data;
u = r->upstream;
if (c->ssl->handshaked) {
if (u->conf->ssl_session_reuse) {
u->peer.save_session(&u->peer, u->peer.data);
}
c->write->handler = ngx_http_upstream_handler;
c->read->handler = ngx_http_upstream_handler;
ngx_http_upstream_send_request(r, u);
return;
}
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR);
}
#endif
static ngx_int_t
ngx_http_upstream_reinit(ngx_http_request_t *r, ngx_http_upstream_t *u)
{
ngx_chain_t *cl;
if (u->reinit_request(r) != NGX_OK) {
return NGX_ERROR;
}
ngx_memzero(&u->headers_in, sizeof(ngx_http_upstream_headers_in_t));
if (ngx_list_init(&u->headers_in.headers, r->pool, 8,
sizeof(ngx_table_elt_t))
!= NGX_OK)
{
return NGX_ERROR;
}
/* reinit the request chain */
for (cl = u->request_bufs; cl; cl = cl->next) {
cl->buf->pos = cl->buf->start;
cl->buf->file_pos = 0;
}
/* reinit the subrequest's ngx_output_chain() context */
if (r->request_body && r->request_body->temp_file
&& r != r->main && u->output.buf)
{
u->output.free = ngx_alloc_chain_link(r->pool);
if (u->output.free == NULL) {
return NGX_ERROR;
}
u->output.free->buf = u->output.buf;
u->output.free->next = NULL;
u->output.buf->pos = u->output.buf->start;
u->output.buf->last = u->output.buf->start;
}
u->output.buf = NULL;
u->output.in = NULL;
u->output.busy = NULL;
/* reinit u->buffer */
u->buffer.pos = u->buffer.start;
#if (NGX_HTTP_CACHE)
if (r->cache) {
u->buffer.pos += r->cache->header_start;
}
#endif
u->buffer.last = u->buffer.pos;
return NGX_OK;
}
static void
ngx_http_upstream_send_request(ngx_http_request_t *r, ngx_http_upstream_t *u)
{
ngx_int_t rc;
ngx_connection_t *c;
c = u->peer.connection;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http upstream send request");
if (!u->request_sent && ngx_http_upstream_test_connect(c) != NGX_OK) {
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR);
return;
}
c->log->action = "sending request to upstream";
rc = ngx_output_chain(&u->output, u->request_sent ? NULL : u->request_bufs);
u->request_sent = 1;
if (rc == NGX_ERROR) {
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR);
return;
}
if (c->write->timer_set) {
ngx_del_timer(c->write);
}
if (rc == NGX_AGAIN) {
ngx_add_timer(c->write, u->conf->send_timeout);
if (ngx_handle_write_event(c->write, u->conf->send_lowat) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
return;
}
/* rc == NGX_OK */
if (c->tcp_nopush == NGX_TCP_NOPUSH_SET) {
if (ngx_tcp_push(c->fd) == NGX_ERROR) {
ngx_log_error(NGX_LOG_CRIT, c->log, ngx_socket_errno,
ngx_tcp_push_n " failed");
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
c->tcp_nopush = NGX_TCP_NOPUSH_UNSET;
}
ngx_add_timer(c->read, u->conf->read_timeout);
#if 1
if (c->read->ready) {
/* post aio operation */
/*
* TODO comment
* although we can post aio operation just in the end
* of ngx_http_upstream_connect() CHECK IT !!!
* it's better to do here because we postpone header buffer allocation
*/
ngx_http_upstream_process_header(r, u);
return;
}
#endif
u->write_event_handler = ngx_http_upstream_dummy_handler;
if (ngx_handle_write_event(c->write, 0) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
}
static void
ngx_http_upstream_send_request_handler(ngx_http_request_t *r,
ngx_http_upstream_t *u)
{
ngx_connection_t *c;
c = u->peer.connection;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http upstream send request handler");
if (c->write->timedout) {
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_TIMEOUT);
return;
}
#if (NGX_HTTP_SSL)
if (u->ssl && c->ssl == NULL) {
ngx_http_upstream_ssl_init_connection(r, u, c);
return;
}
#endif
if (u->header_sent) {
u->write_event_handler = ngx_http_upstream_dummy_handler;
(void) ngx_handle_write_event(c->write, 0);
return;
}
ngx_http_upstream_send_request(r, u);
}
static void
ngx_http_upstream_process_header(ngx_http_request_t *r, ngx_http_upstream_t *u)
{
ssize_t n;
ngx_int_t rc;
ngx_connection_t *c;
c = u->peer.connection;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http upstream process header");
c->log->action = "reading response header from upstream";
if (c->read->timedout) {
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_TIMEOUT);
return;
}
if (!u->request_sent && ngx_http_upstream_test_connect(c) != NGX_OK) {
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR);
return;
}
if (u->buffer.start == NULL) {
u->buffer.start = ngx_palloc(r->pool, u->conf->buffer_size);
if (u->buffer.start == NULL) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
u->buffer.pos = u->buffer.start;
u->buffer.last = u->buffer.start;
u->buffer.end = u->buffer.start + u->conf->buffer_size;
u->buffer.temporary = 1;
u->buffer.tag = u->output.tag;
if (ngx_list_init(&u->headers_in.headers, r->pool, 8,
sizeof(ngx_table_elt_t))
!= NGX_OK)
{
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
#if (NGX_HTTP_CACHE)
if (r->cache) {
u->buffer.pos += r->cache->header_start;
u->buffer.last = u->buffer.pos;
}
#endif
}
for ( ;; ) {
n = c->recv(c, u->buffer.last, u->buffer.end - u->buffer.last);
if (n == NGX_AGAIN) {
#if 0
ngx_add_timer(rev, u->read_timeout);
#endif
if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
return;
}
if (n == 0) {
ngx_log_error(NGX_LOG_ERR, c->log, 0,
"upstream prematurely closed connection");
}
if (n == NGX_ERROR || n == 0) {
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR);
return;
}
u->buffer.last += n;
#if 0
u->valid_header_in = 0;
u->peer.cached = 0;
#endif
rc = u->process_header(r);
if (rc == NGX_AGAIN) {
if (u->buffer.pos == u->buffer.end) {
ngx_log_error(NGX_LOG_ERR, c->log, 0,
"upstream sent too big header");
ngx_http_upstream_next(r, u,
NGX_HTTP_UPSTREAM_FT_INVALID_HEADER);
return;
}
continue;
}
break;
}
if (rc == NGX_HTTP_UPSTREAM_INVALID_HEADER) {
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_INVALID_HEADER);
return;
}
if (rc == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
/* rc == NGX_OK */
if (u->headers_in.status_n > NGX_HTTP_SPECIAL_RESPONSE) {
if (r->subrequest_in_memory) {
u->buffer.last = u->buffer.pos;
}
if (ngx_http_upstream_test_next(r, u) == NGX_OK) {
return;
}
if (ngx_http_upstream_intercept_errors(r, u) == NGX_OK) {
return;
}
}
if (ngx_http_upstream_process_headers(r, u) != NGX_OK) {
return;
}
if (!r->subrequest_in_memory) {
ngx_http_upstream_send_response(r, u);
return;
}
/* subrequest content in memory */
if (u->input_filter == NULL) {
u->input_filter_init = ngx_http_upstream_non_buffered_filter_init;
u->input_filter = ngx_http_upstream_non_buffered_filter;
u->input_filter_ctx = r;
}
if (u->input_filter_init(u->input_filter_ctx) == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
n = u->buffer.last - u->buffer.pos;
if (n) {
u->buffer.last -= n;
u->state->response_length += n;
if (u->input_filter(u->input_filter_ctx, n) == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
return;
}
if (u->length == 0) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
}
u->read_event_handler = ngx_http_upstream_process_body_in_memory;
ngx_http_upstream_process_body_in_memory(r, u);
}
static ngx_int_t
ngx_http_upstream_test_next(ngx_http_request_t *r, ngx_http_upstream_t *u)
{
ngx_uint_t status;
ngx_http_upstream_next_t *un;
status = u->headers_in.status_n;
for (un = ngx_http_upstream_next_errors; un->status; un++) {
if (status != un->status) {
continue;
}
if (u->peer.tries > 1 && (u->conf->next_upstream & un->mask)) {
ngx_http_upstream_next(r, u, un->mask);
return NGX_OK;
}
#if (NGX_HTTP_CACHE)
if (u->cache_status == NGX_HTTP_CACHE_EXPIRED
&& (u->conf->cache_use_stale & un->mask))
{
ngx_int_t rc;
rc = u->reinit_request(r);
if (rc == NGX_OK) {
u->cache_status = NGX_HTTP_CACHE_STALE;
rc = ngx_http_upstream_cache_send(r, u);
}
ngx_http_upstream_finalize_request(r, u, rc);
return NGX_OK;
}
#endif
}
return NGX_DECLINED;
}
static ngx_int_t
ngx_http_upstream_intercept_errors(ngx_http_request_t *r,
ngx_http_upstream_t *u)
{
ngx_int_t status;
ngx_uint_t i;
ngx_table_elt_t *h;
ngx_http_err_page_t *err_page;
ngx_http_core_loc_conf_t *clcf;
status = u->headers_in.status_n;
if (status == NGX_HTTP_NOT_FOUND && u->conf->intercept_404) {
ngx_http_upstream_finalize_request(r, u, NGX_HTTP_NOT_FOUND);
return NGX_OK;
}
if (!u->conf->intercept_errors) {
return NGX_DECLINED;
}
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
if (clcf->error_pages == NULL) {
return NGX_DECLINED;
}
err_page = clcf->error_pages->elts;
for (i = 0; i < clcf->error_pages->nelts; i++) {
if (err_page[i].status == status) {
if (status == NGX_HTTP_UNAUTHORIZED
&& u->headers_in.www_authenticate)
{
h = ngx_list_push(&r->headers_out.headers);
if (h == NULL) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return NGX_OK;
}
*h = *u->headers_in.www_authenticate;
r->headers_out.www_authenticate = h;
}
#if (NGX_HTTP_CACHE)
if (r->cache) {
time_t valid;
valid = ngx_http_file_cache_valid(u->conf->cache_valid, status);
if (valid) {
r->cache->valid_sec = ngx_time() + valid;
r->cache->error = status;
}
ngx_http_file_cache_free(r->cache, u->pipe->temp_file);
}
#endif
ngx_http_upstream_finalize_request(r, u, status);
return NGX_OK;
}
}
return NGX_DECLINED;
}
static ngx_int_t
ngx_http_upstream_test_connect(ngx_connection_t *c)
{
int err;
socklen_t len;
#if (NGX_HAVE_KQUEUE)
if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
if (c->write->pending_eof) {
c->log->action = "connecting to upstream";
(void) ngx_connection_error(c, c->write->kq_errno,
"kevent() reported that connect() failed");
return NGX_ERROR;
}
} else
#endif
{
err = 0;
len = sizeof(int);
/*
* BSDs and Linux return 0 and set a pending error in err
* Solaris returns -1 and sets errno
*/
if (getsockopt(c->fd, SOL_SOCKET, SO_ERROR, (void *) &err, &len)
== -1)
{
err = ngx_errno;
}
if (err) {
c->log->action = "connecting to upstream";
(void) ngx_connection_error(c, err, "connect() failed");
return NGX_ERROR;
}
}
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_process_headers(ngx_http_request_t *r, ngx_http_upstream_t *u)
{
ngx_str_t *uri, args;
ngx_uint_t i, flags;
ngx_list_part_t *part;
ngx_table_elt_t *h;
ngx_http_upstream_header_t *hh;
ngx_http_upstream_main_conf_t *umcf;
umcf = ngx_http_get_module_main_conf(r, ngx_http_upstream_module);
if (u->headers_in.x_accel_redirect
&& !(u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_XA_REDIRECT))
{
ngx_http_upstream_finalize_request(r, u, NGX_DECLINED);
part = &u->headers_in.headers.part;
h = part->elts;
for (i = 0; /* void */; i++) {
if (i >= part->nelts) {
if (part->next == NULL) {
break;
}
part = part->next;
h = part->elts;
i = 0;
}
hh = ngx_hash_find(&umcf->headers_in_hash, h[i].hash,
h[i].lowcase_key, h[i].key.len);
if (hh && hh->redirect) {
if (hh->copy_handler(r, &h[i], hh->conf) != NGX_OK) {
ngx_http_finalize_request(r,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return NGX_DONE;
}
}
}
uri = &u->headers_in.x_accel_redirect->value;
ngx_str_null(&args);
flags = NGX_HTTP_LOG_UNSAFE;
if (ngx_http_parse_unsafe_uri(r, uri, &args, &flags) != NGX_OK) {
ngx_http_finalize_request(r, NGX_HTTP_NOT_FOUND);
return NGX_DONE;
}
if (r->method != NGX_HTTP_HEAD) {
r->method = NGX_HTTP_GET;
}
r->valid_unparsed_uri = 0;
ngx_http_internal_redirect(r, uri, &args);
ngx_http_finalize_request(r, NGX_DONE);
return NGX_DONE;
}
part = &u->headers_in.headers.part;
h = part->elts;
for (i = 0; /* void */; i++) {
if (i >= part->nelts) {
if (part->next == NULL) {
break;
}
part = part->next;
h = part->elts;
i = 0;
}
if (ngx_hash_find(&u->conf->hide_headers_hash, h[i].hash,
h[i].lowcase_key, h[i].key.len))
{
continue;
}
hh = ngx_hash_find(&umcf->headers_in_hash, h[i].hash,
h[i].lowcase_key, h[i].key.len);
if (hh) {
if (hh->copy_handler(r, &h[i], hh->conf) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return NGX_DONE;
}
continue;
}
if (ngx_http_upstream_copy_header_line(r, &h[i], 0) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return NGX_DONE;
}
}
if (r->headers_out.server && r->headers_out.server->value.data == NULL) {
r->headers_out.server->hash = 0;
}
if (r->headers_out.date && r->headers_out.date->value.data == NULL) {
r->headers_out.date->hash = 0;
}
r->headers_out.status = u->headers_in.status_n;
r->headers_out.status_line = u->headers_in.status_line;
u->headers_in.content_length_n = r->headers_out.content_length_n;
if (r->headers_out.content_length_n != -1) {
u->length = (size_t) r->headers_out.content_length_n;
} else {
u->length = NGX_MAX_SIZE_T_VALUE;
}
return NGX_OK;
}
static void
ngx_http_upstream_process_body_in_memory(ngx_http_request_t *r,
ngx_http_upstream_t *u)
{
size_t size;
ssize_t n;
ngx_buf_t *b;
ngx_event_t *rev;
ngx_connection_t *c;
c = u->peer.connection;
rev = c->read;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http upstream process body on memory");
if (rev->timedout) {
ngx_connection_error(c, NGX_ETIMEDOUT, "upstream timed out");
ngx_http_upstream_finalize_request(r, u, NGX_ETIMEDOUT);
return;
}
b = &u->buffer;
for ( ;; ) {
size = b->end - b->last;
if (size == 0) {
ngx_log_error(NGX_LOG_ALERT, c->log, 0,
"upstream buffer is too small to read response");
ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
return;
}
n = c->recv(c, b->last, size);
if (n == NGX_AGAIN) {
break;
}
if (n == 0 || n == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u, n);
return;
}
u->state->response_length += n;
if (u->input_filter(u->input_filter_ctx, n) == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
return;
}
if (!rev->ready) {
break;
}
}
if (ngx_handle_read_event(rev, 0) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
return;
}
if (rev->active) {
ngx_add_timer(rev, u->conf->read_timeout);
} else if (rev->timer_set) {
ngx_del_timer(rev);
}
}
static void
ngx_http_upstream_send_response(ngx_http_request_t *r, ngx_http_upstream_t *u)
{
int tcp_nodelay;
ssize_t n;
ngx_int_t rc;
ngx_event_pipe_t *p;
ngx_connection_t *c;
ngx_http_core_loc_conf_t *clcf;
rc = ngx_http_send_header(r);
if (rc == NGX_ERROR || rc > NGX_OK || r->post_action) {
ngx_http_upstream_finalize_request(r, u, rc);
return;
}
c = r->connection;
if (r->header_only) {
if (u->cacheable || u->store) {
if (ngx_shutdown_socket(c->fd, NGX_WRITE_SHUTDOWN) == -1) {
ngx_connection_error(c, ngx_socket_errno,
ngx_shutdown_socket_n " failed");
}
r->read_event_handler = ngx_http_request_empty_handler;
r->write_event_handler = ngx_http_request_empty_handler;
c->error = 1;
} else {
ngx_http_upstream_finalize_request(r, u, rc);
return;
}
}
u->header_sent = 1;
if (r->request_body && r->request_body->temp_file) {
ngx_pool_run_cleanup_file(r->pool, r->request_body->temp_file->file.fd);
r->request_body->temp_file->file.fd = NGX_INVALID_FILE;
}
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
if (!u->buffering) {
if (u->input_filter == NULL) {
u->input_filter_init = ngx_http_upstream_non_buffered_filter_init;
u->input_filter = ngx_http_upstream_non_buffered_filter;
u->input_filter_ctx = r;
}
u->read_event_handler = ngx_http_upstream_process_non_buffered_upstream;
r->write_event_handler =
ngx_http_upstream_process_non_buffered_downstream;
r->limit_rate = 0;
if (u->input_filter_init(u->input_filter_ctx) == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
if (clcf->tcp_nodelay && c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "tcp_nodelay");
tcp_nodelay = 1;
if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY,
(const void *) &tcp_nodelay, sizeof(int)) == -1)
{
ngx_connection_error(c, ngx_socket_errno,
"setsockopt(TCP_NODELAY) failed");
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
c->tcp_nodelay = NGX_TCP_NODELAY_SET;
}
n = u->buffer.last - u->buffer.pos;
if (n) {
u->buffer.last = u->buffer.pos;
u->state->response_length += n;
if (u->input_filter(u->input_filter_ctx, n) == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
ngx_http_upstream_process_non_buffered_downstream(r);
} else {
u->buffer.pos = u->buffer.start;
u->buffer.last = u->buffer.start;
if (ngx_http_send_special(r, NGX_HTTP_FLUSH) == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
if (u->peer.connection->read->ready) {
ngx_http_upstream_process_non_buffered_upstream(r, u);
}
}
return;
}
/* TODO: preallocate event_pipe bufs, look "Content-Length" */
#if (NGX_HTTP_CACHE)
if (r->cache && r->cache->file.fd != NGX_INVALID_FILE) {
ngx_pool_run_cleanup_file(r->pool, r->cache->file.fd);
r->cache->file.fd = NGX_INVALID_FILE;
}
switch (ngx_http_test_predicates(r, u->conf->no_cache)) {
case NGX_ERROR:
ngx_http_upstream_finalize_request(r, u, 0);
return;
case NGX_DECLINED:
u->cacheable = 0;
break;
default: /* NGX_OK */
if (u->cache_status == NGX_HTTP_CACHE_BYPASS) {
r->cache->min_uses = u->conf->cache_min_uses;
r->cache->body_start = u->conf->buffer_size;
r->cache->file_cache = u->conf->cache->data;
if (ngx_http_file_cache_create(r) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
}
break;
}
if (u->cacheable) {
time_t now, valid;
now = ngx_time();
valid = r->cache->valid_sec;
if (valid == 0) {
valid = ngx_http_file_cache_valid(u->conf->cache_valid,
u->headers_in.status_n);
if (valid) {
r->cache->valid_sec = now + valid;
}
}
if (valid) {
r->cache->last_modified = r->headers_out.last_modified_time;
r->cache->date = now;
r->cache->body_start = (u_short) (u->buffer.pos - u->buffer.start);
ngx_http_file_cache_set_header(r, u->buffer.start);
} else {
u->cacheable = 0;
r->headers_out.last_modified_time = -1;
}
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http cacheable: %d", u->cacheable);
if (u->cacheable == 0 && r->cache) {
ngx_http_file_cache_free(r->cache, u->pipe->temp_file);
}
#endif
p = u->pipe;
p->output_filter = (ngx_event_pipe_output_filter_pt) ngx_http_output_filter;
p->output_ctx = r;
p->tag = u->output.tag;
p->bufs = u->conf->bufs;
p->busy_size = u->conf->busy_buffers_size;
p->upstream = u->peer.connection;
p->downstream = c;
p->pool = r->pool;
p->log = c->log;
p->cacheable = u->cacheable || u->store;
p->temp_file = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t));
if (p->temp_file == NULL) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
p->temp_file->file.fd = NGX_INVALID_FILE;
p->temp_file->file.log = c->log;
p->temp_file->path = u->conf->temp_path;
p->temp_file->pool = r->pool;
if (p->cacheable) {
p->temp_file->persistent = 1;
} else {
p->temp_file->log_level = NGX_LOG_WARN;
p->temp_file->warn = "an upstream response is buffered "
"to a temporary file";
}
p->max_temp_file_size = u->conf->max_temp_file_size;
p->temp_file_write_size = u->conf->temp_file_write_size;
p->preread_bufs = ngx_alloc_chain_link(r->pool);
if (p->preread_bufs == NULL) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
p->preread_bufs->buf = &u->buffer;
p->preread_bufs->next = NULL;
u->buffer.recycled = 1;
p->preread_size = u->buffer.last - u->buffer.pos;
if (u->cacheable) {
p->buf_to_file = ngx_calloc_buf(r->pool);
if (p->buf_to_file == NULL) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
p->buf_to_file->pos = u->buffer.start;
p->buf_to_file->last = u->buffer.pos;
p->buf_to_file->temporary = 1;
}
if (ngx_event_flags & NGX_USE_AIO_EVENT) {
/* the posted aio operation may currupt a shadow buffer */
p->single_buf = 1;
}
/* TODO: p->free_bufs = 0 if use ngx_create_chain_of_bufs() */
p->free_bufs = 1;
/*
* event_pipe would do u->buffer.last += p->preread_size
* as though these bytes were read
*/
u->buffer.last = u->buffer.pos;
if (u->conf->cyclic_temp_file) {
/*
* we need to disable the use of sendfile() if we use cyclic temp file
* because the writing a new data may interfere with sendfile()
* that uses the same kernel file pages (at least on FreeBSD)
*/
p->cyclic_temp_file = 1;
c->sendfile = 0;
} else {
p->cyclic_temp_file = 0;
}
p->read_timeout = u->conf->read_timeout;
p->send_timeout = clcf->send_timeout;
p->send_lowat = clcf->send_lowat;
u->read_event_handler = ngx_http_upstream_process_upstream;
r->write_event_handler = ngx_http_upstream_process_downstream;
ngx_http_upstream_process_upstream(r, u);
}
static void
ngx_http_upstream_process_non_buffered_downstream(ngx_http_request_t *r)
{
ngx_event_t *wev;
ngx_connection_t *c;
ngx_http_upstream_t *u;
c = r->connection;
u = r->upstream;
wev = c->write;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http upstream process non buffered downstream");
c->log->action = "sending to client";
if (wev->timedout) {
c->timedout = 1;
ngx_connection_error(c, NGX_ETIMEDOUT, "client timed out");
ngx_http_upstream_finalize_request(r, u, NGX_HTTP_REQUEST_TIME_OUT);
return;
}
ngx_http_upstream_process_non_buffered_request(r, 1);
}
static void
ngx_http_upstream_process_non_buffered_upstream(ngx_http_request_t *r,
ngx_http_upstream_t *u)
{
ngx_connection_t *c;
c = u->peer.connection;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http upstream process non buffered upstream");
c->log->action = "reading upstream";
if (c->read->timedout) {
ngx_connection_error(c, NGX_ETIMEDOUT, "upstream timed out");
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
ngx_http_upstream_process_non_buffered_request(r, 0);
}
static void
ngx_http_upstream_process_non_buffered_request(ngx_http_request_t *r,
ngx_uint_t do_write)
{
size_t size;
ssize_t n;
ngx_buf_t *b;
ngx_int_t rc;
ngx_connection_t *downstream, *upstream;
ngx_http_upstream_t *u;
ngx_http_core_loc_conf_t *clcf;
u = r->upstream;
downstream = r->connection;
upstream = u->peer.connection;
b = &u->buffer;
do_write = do_write || u->length == 0;
for ( ;; ) {
if (do_write) {
if (u->out_bufs || u->busy_bufs) {
rc = ngx_http_output_filter(r, u->out_bufs);
if (rc == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
ngx_chain_update_chains(&u->free_bufs, &u->busy_bufs,
&u->out_bufs, u->output.tag);
}
if (u->busy_bufs == NULL) {
if (u->length == 0
|| upstream->read->eof
|| upstream->read->error)
{
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
b->pos = b->start;
b->last = b->start;
}
}
size = b->end - b->last;
if (size > u->length) {
size = u->length;
}
if (size && upstream->read->ready) {
n = upstream->recv(upstream, b->last, size);
if (n == NGX_AGAIN) {
break;
}
if (n > 0) {
u->state->response_length += n;
if (u->input_filter(u->input_filter_ctx, n) == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
}
do_write = 1;
continue;
}
break;
}
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
if (downstream->data == r) {
if (ngx_handle_write_event(downstream->write, clcf->send_lowat)
!= NGX_OK)
{
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
}
if (downstream->write->active && !downstream->write->ready) {
ngx_add_timer(downstream->write, clcf->send_timeout);
} else if (downstream->write->timer_set) {
ngx_del_timer(downstream->write);
}
if (ngx_handle_read_event(upstream->read, 0) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
if (upstream->read->active && !upstream->read->ready) {
ngx_add_timer(upstream->read, u->conf->read_timeout);
} else if (upstream->read->timer_set) {
ngx_del_timer(upstream->read);
}
}
static ngx_int_t
ngx_http_upstream_non_buffered_filter_init(void *data)
{
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_non_buffered_filter(void *data, ssize_t bytes)
{
ngx_http_request_t *r = data;
ngx_buf_t *b;
ngx_chain_t *cl, **ll;
ngx_http_upstream_t *u;
u = r->upstream;
for (cl = u->out_bufs, ll = &u->out_bufs; cl; cl = cl->next) {
ll = &cl->next;
}
cl = ngx_chain_get_free_buf(r->pool, &u->free_bufs);
if (cl == NULL) {
return NGX_ERROR;
}
*ll = cl;
cl->buf->flush = 1;
cl->buf->memory = 1;
b = &u->buffer;
cl->buf->pos = b->last;
b->last += bytes;
cl->buf->last = b->last;
cl->buf->tag = u->output.tag;
if (u->length == NGX_MAX_SIZE_T_VALUE) {
return NGX_OK;
}
u->length -= bytes;
return NGX_OK;
}
static void
ngx_http_upstream_process_downstream(ngx_http_request_t *r)
{
ngx_event_t *wev;
ngx_connection_t *c;
ngx_event_pipe_t *p;
ngx_http_upstream_t *u;
c = r->connection;
u = r->upstream;
p = u->pipe;
wev = c->write;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http upstream process downstream");
c->log->action = "sending to client";
if (wev->timedout) {
if (wev->delayed) {
wev->timedout = 0;
wev->delayed = 0;
if (!wev->ready) {
ngx_add_timer(wev, p->send_timeout);
if (ngx_handle_write_event(wev, p->send_lowat) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u, 0);
}
return;
}
if (ngx_event_pipe(p, wev->write) == NGX_ABORT) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
} else {
p->downstream_error = 1;
c->timedout = 1;
ngx_connection_error(c, NGX_ETIMEDOUT, "client timed out");
}
} else {
if (wev->delayed) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http downstream delayed");
if (ngx_handle_write_event(wev, p->send_lowat) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u, 0);
}
return;
}
if (ngx_event_pipe(p, 1) == NGX_ABORT) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
}
ngx_http_upstream_process_request(r);
}
static void
ngx_http_upstream_process_upstream(ngx_http_request_t *r,
ngx_http_upstream_t *u)
{
ngx_connection_t *c;
c = u->peer.connection;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http upstream process upstream");
c->log->action = "reading upstream";
if (c->read->timedout) {
u->pipe->upstream_error = 1;
ngx_connection_error(c, NGX_ETIMEDOUT, "upstream timed out");
} else {
if (ngx_event_pipe(u->pipe, 0) == NGX_ABORT) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
}
ngx_http_upstream_process_request(r);
}
static void
ngx_http_upstream_process_request(ngx_http_request_t *r)
{
ngx_uint_t del;
ngx_temp_file_t *tf;
ngx_event_pipe_t *p;
ngx_http_upstream_t *u;
u = r->upstream;
p = u->pipe;
if (u->peer.connection) {
if (u->store) {
del = p->upstream_error;
tf = u->pipe->temp_file;
if (p->upstream_eof || p->upstream_done) {
if (u->headers_in.status_n == NGX_HTTP_OK
&& (u->headers_in.content_length_n == -1
|| (u->headers_in.content_length_n == tf->offset)))
{
ngx_http_upstream_store(r, u);
} else {
del = 1;
}
}
if (del && tf->file.fd != NGX_INVALID_FILE) {
if (ngx_delete_file(tf->file.name.data) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
ngx_delete_file_n " \"%s\" failed",
u->pipe->temp_file->file.name.data);
}
}
}
#if (NGX_HTTP_CACHE)
if (u->cacheable) {
if (p->upstream_done) {
ngx_http_file_cache_update(r, u->pipe->temp_file);
} else if (p->upstream_eof) {
/* TODO: check length & update cache */
ngx_http_file_cache_update(r, u->pipe->temp_file);
} else if (p->upstream_error) {
ngx_http_file_cache_free(r->cache, u->pipe->temp_file);
}
}
#endif
if (p->upstream_done || p->upstream_eof || p->upstream_error) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http upstream exit: %p", p->out);
#if 0
ngx_http_busy_unlock(u->conf->busy_lock, &u->busy_lock);
#endif
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
}
if (p->downstream_error) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http upstream downstream error");
if (!u->cacheable && !u->store && u->peer.connection) {
ngx_http_upstream_finalize_request(r, u, 0);
}
}
}
static void
ngx_http_upstream_store(ngx_http_request_t *r, ngx_http_upstream_t *u)
{
size_t root;
time_t lm;
ngx_str_t path;
ngx_temp_file_t *tf;
ngx_ext_rename_file_t ext;
tf = u->pipe->temp_file;
if (tf->file.fd == NGX_INVALID_FILE) {
/* create file for empty 200 response */
tf = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t));
if (tf == NULL) {
return;
}
tf->file.fd = NGX_INVALID_FILE;
tf->file.log = r->connection->log;
tf->path = u->conf->temp_path;
tf->pool = r->pool;
tf->persistent = 1;
if (ngx_create_temp_file(&tf->file, tf->path, tf->pool,
tf->persistent, tf->clean, tf->access)
!= NGX_OK)
{
return;
}
u->pipe->temp_file = tf;
}
ext.access = u->conf->store_access;
ext.path_access = u->conf->store_access;
ext.time = -1;
ext.create_path = 1;
ext.delete_file = 1;
ext.log = r->connection->log;
if (u->headers_in.last_modified) {
lm = ngx_http_parse_time(u->headers_in.last_modified->value.data,
u->headers_in.last_modified->value.len);
if (lm != NGX_ERROR) {
ext.time = lm;
ext.fd = tf->file.fd;
}
}
if (u->conf->store_lengths == NULL) {
ngx_http_map_uri_to_path(r, &path, &root, 0);
} else {
if (ngx_http_script_run(r, &path, u->conf->store_lengths->elts, 0,
u->conf->store_values->elts)
== NULL)
{
return;
}
}
path.len--;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"upstream stores \"%s\" to \"%s\"",
tf->file.name.data, path.data);
(void) ngx_ext_rename_file(&tf->file.name, &path, &ext);
}
static void
ngx_http_upstream_dummy_handler(ngx_http_request_t *r, ngx_http_upstream_t *u)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http upstream dummy handler");
}
static void
ngx_http_upstream_next(ngx_http_request_t *r, ngx_http_upstream_t *u,
ngx_uint_t ft_type)
{
ngx_uint_t status, state;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http next upstream, %xi", ft_type);
#if 0
ngx_http_busy_unlock(u->conf->busy_lock, &u->busy_lock);
#endif
if (ft_type == NGX_HTTP_UPSTREAM_FT_HTTP_404) {
state = NGX_PEER_NEXT;
} else {
state = NGX_PEER_FAILED;
}
if (ft_type != NGX_HTTP_UPSTREAM_FT_NOLIVE) {
u->peer.free(&u->peer, u->peer.data, state);
}
if (ft_type == NGX_HTTP_UPSTREAM_FT_TIMEOUT) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, NGX_ETIMEDOUT,
"upstream timed out");
}
if (u->peer.cached && ft_type == NGX_HTTP_UPSTREAM_FT_ERROR) {
status = 0;
} else {
switch(ft_type) {
case NGX_HTTP_UPSTREAM_FT_TIMEOUT:
status = NGX_HTTP_GATEWAY_TIME_OUT;
break;
case NGX_HTTP_UPSTREAM_FT_HTTP_500:
status = NGX_HTTP_INTERNAL_SERVER_ERROR;
break;
case NGX_HTTP_UPSTREAM_FT_HTTP_404:
status = NGX_HTTP_NOT_FOUND;
break;
/*
* NGX_HTTP_UPSTREAM_FT_BUSY_LOCK and NGX_HTTP_UPSTREAM_FT_MAX_WAITING
* never reach here
*/
default:
status = NGX_HTTP_BAD_GATEWAY;
}
}
if (r->connection->error) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_CLIENT_CLOSED_REQUEST);
return;
}
if (status) {
u->state->status = status;
if (u->peer.tries == 0 || !(u->conf->next_upstream & ft_type)) {
#if (NGX_HTTP_CACHE)
if (u->cache_status == NGX_HTTP_CACHE_EXPIRED
&& (u->conf->cache_use_stale & ft_type))
{
ngx_int_t rc;
rc = u->reinit_request(r);
if (rc == NGX_OK) {
u->cache_status = NGX_HTTP_CACHE_STALE;
rc = ngx_http_upstream_cache_send(r, u);
}
ngx_http_upstream_finalize_request(r, u, rc);
return;
}
#endif
ngx_http_upstream_finalize_request(r, u, status);
return;
}
}
if (u->peer.connection) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"close http upstream connection: %d",
u->peer.connection->fd);
#if (NGX_HTTP_SSL)
if (u->peer.connection->ssl) {
u->peer.connection->ssl->no_wait_shutdown = 1;
u->peer.connection->ssl->no_send_shutdown = 1;
(void) ngx_ssl_shutdown(u->peer.connection);
}
#endif
ngx_close_connection(u->peer.connection);
u->peer.connection = NULL;
}
#if 0
if (u->conf->busy_lock && !u->busy_locked) {
ngx_http_upstream_busy_lock(p);
return;
}
#endif
ngx_http_upstream_connect(r, u);
}
static void
ngx_http_upstream_cleanup(void *data)
{
ngx_http_request_t *r = data;
ngx_http_upstream_t *u;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"cleanup http upstream request: \"%V\"", &r->uri);
u = r->upstream;
if (u->resolved && u->resolved->ctx) {
ngx_resolve_name_done(u->resolved->ctx);
u->resolved->ctx = NULL;
}
ngx_http_upstream_finalize_request(r, u, NGX_DONE);
}
static void
ngx_http_upstream_finalize_request(ngx_http_request_t *r,
ngx_http_upstream_t *u, ngx_int_t rc)
{
ngx_time_t *tp;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"finalize http upstream request: %i", rc);
if (u->cleanup) {
*u->cleanup = NULL;
u->cleanup = NULL;
}
if (u->resolved && u->resolved->ctx) {
ngx_resolve_name_done(u->resolved->ctx);
u->resolved->ctx = NULL;
}
if (u->state && u->state->response_sec) {
tp = ngx_timeofday();
u->state->response_sec = tp->sec - u->state->response_sec;
u->state->response_msec = tp->msec - u->state->response_msec;
if (u->pipe) {
u->state->response_length = u->pipe->read_length;
}
}
u->finalize_request(r, rc);
if (u->peer.free) {
u->peer.free(&u->peer, u->peer.data, 0);
}
if (u->peer.connection) {
#if (NGX_HTTP_SSL)
/* TODO: do not shutdown persistent connection */
if (u->peer.connection->ssl) {
/*
* We send the "close notify" shutdown alert to the upstream only
* and do not wait its "close notify" shutdown alert.
* It is acceptable according to the TLS standard.
*/
u->peer.connection->ssl->no_wait_shutdown = 1;
(void) ngx_ssl_shutdown(u->peer.connection);
}
#endif
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"close http upstream connection: %d",
u->peer.connection->fd);
ngx_close_connection(u->peer.connection);
}
u->peer.connection = NULL;
if (u->pipe && u->pipe->temp_file) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http upstream temp fd: %d",
u->pipe->temp_file->file.fd);
}
#if (NGX_HTTP_CACHE)
if (r->cache) {
if (u->cacheable) {
if (rc == NGX_HTTP_BAD_GATEWAY || rc == NGX_HTTP_GATEWAY_TIME_OUT) {
time_t valid;
valid = ngx_http_file_cache_valid(u->conf->cache_valid, rc);
if (valid) {
r->cache->valid_sec = ngx_time() + valid;
r->cache->error = rc;
}
}
}
ngx_http_file_cache_free(r->cache, u->pipe->temp_file);
}
#endif
if (u->header_sent
&& rc != NGX_HTTP_REQUEST_TIME_OUT
&& (rc == NGX_ERROR || rc >= NGX_HTTP_SPECIAL_RESPONSE))
{
rc = 0;
}
if (rc == NGX_DECLINED) {
return;
}
r->connection->log->action = "sending to client";
if (rc == 0
#if (NGX_HTTP_CACHE)
&& !r->cached
#endif
)
{
rc = ngx_http_send_special(r, NGX_HTTP_LAST);
}
ngx_http_finalize_request(r, rc);
}
static ngx_int_t
ngx_http_upstream_process_header_line(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
ngx_table_elt_t **ph;
ph = (ngx_table_elt_t **) ((char *) &r->upstream->headers_in + offset);
if (*ph == NULL) {
*ph = h;
}
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_ignore_header_line(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_process_set_cookie(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
#if (NGX_HTTP_CACHE)
ngx_http_upstream_t *u;
u = r->upstream;
if (!(u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_SET_COOKIE)) {
u->cacheable = 0;
}
#endif
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_process_cache_control(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset)
{
ngx_array_t *pa;
ngx_table_elt_t **ph;
ngx_http_upstream_t *u;
u = r->upstream;
pa = &u->headers_in.cache_control;
if (pa->elts == NULL) {
if (ngx_array_init(pa, r->pool, 2, sizeof(ngx_table_elt_t *)) != NGX_OK)
{
return NGX_ERROR;
}
}
ph = ngx_array_push(pa);
if (ph == NULL) {
return NGX_ERROR;
}
*ph = h;
#if (NGX_HTTP_CACHE)
{
u_char *p, *last;
ngx_int_t n;
if (u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_CACHE_CONTROL) {
return NGX_OK;
}
if (r->cache == NULL) {
return NGX_OK;
}
if (r->cache->valid_sec != 0) {
return NGX_OK;
}
p = h->value.data;
last = p + h->value.len;
if (ngx_strlcasestrn(p, last, (u_char *) "no-cache", 8 - 1) != NULL
|| ngx_strlcasestrn(p, last, (u_char *) "no-store", 8 - 1) != NULL
|| ngx_strlcasestrn(p, last, (u_char *) "private", 7 - 1) != NULL)
{
u->cacheable = 0;
return NGX_OK;
}
p = ngx_strlcasestrn(p, last, (u_char *) "max-age=", 8 - 1);
if (p == NULL) {
return NGX_OK;
}
n = 0;
for (p += 8; p < last; p++) {
if (*p == ',' || *p == ';' || *p == ' ') {
break;
}
if (*p >= '0' && *p <= '9') {
n = n * 10 + *p - '0';
continue;
}
u->cacheable = 0;
return NGX_OK;
}
if (n == 0) {
u->cacheable = 0;
return NGX_OK;
}
r->cache->valid_sec = ngx_time() + n;
}
#endif
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_process_expires(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
ngx_http_upstream_t *u;
u = r->upstream;
u->headers_in.expires = h;
#if (NGX_HTTP_CACHE)
{
time_t expires;
if (u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_EXPIRES) {
return NGX_OK;
}
if (r->cache == NULL) {
return NGX_OK;
}
if (r->cache->valid_sec != 0) {
return NGX_OK;
}
expires = ngx_http_parse_time(h->value.data, h->value.len);
if (expires == NGX_ERROR || expires < ngx_time()) {
u->cacheable = 0;
return NGX_OK;
}
r->cache->valid_sec = expires;
}
#endif
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_process_accel_expires(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset)
{
ngx_http_upstream_t *u;
u = r->upstream;
u->headers_in.x_accel_expires = h;
#if (NGX_HTTP_CACHE)
{
u_char *p;
size_t len;
ngx_int_t n;
if (u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_XA_EXPIRES) {
return NGX_OK;
}
if (r->cache == NULL) {
return NGX_OK;
}
len = h->value.len;
p = h->value.data;
if (p[0] != '@') {
n = ngx_atoi(p, len);
switch (n) {
case 0:
u->cacheable = 0;
case NGX_ERROR:
return NGX_OK;
default:
r->cache->valid_sec = ngx_time() + n;
return NGX_OK;
}
}
p++;
len--;
n = ngx_atoi(p, len);
if (n != NGX_ERROR) {
r->cache->valid_sec = n;
}
}
#endif
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_process_limit_rate(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
ngx_int_t n;
ngx_http_upstream_t *u;
u = r->upstream;
u->headers_in.x_accel_limit_rate = h;
if (u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_XA_LIMIT_RATE) {
return NGX_OK;
}
n = ngx_atoi(h->value.data, h->value.len);
if (n != NGX_ERROR) {
r->limit_rate = (size_t) n;
}
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_process_buffering(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
u_char c0, c1, c2;
ngx_http_upstream_t *u;
u = r->upstream;
if (u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_XA_BUFFERING) {
return NGX_OK;
}
if (u->conf->change_buffering) {
if (h->value.len == 2) {
c0 = ngx_tolower(h->value.data[0]);
c1 = ngx_tolower(h->value.data[1]);
if (c0 == 'n' && c1 == 'o') {
u->buffering = 0;
}
} else if (h->value.len == 3) {
c0 = ngx_tolower(h->value.data[0]);
c1 = ngx_tolower(h->value.data[1]);
c2 = ngx_tolower(h->value.data[2]);
if (c0 == 'y' && c1 == 'e' && c2 == 's') {
u->buffering = 1;
}
}
}
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_process_charset(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
if (r->upstream->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_XA_CHARSET) {
return NGX_OK;
}
r->headers_out.override_charset = &h->value;
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_copy_header_line(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
ngx_table_elt_t *ho, **ph;
ho = ngx_list_push(&r->headers_out.headers);
if (ho == NULL) {
return NGX_ERROR;
}
*ho = *h;
if (offset) {
ph = (ngx_table_elt_t **) ((char *) &r->headers_out + offset);
*ph = ho;
}
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_copy_multi_header_lines(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset)
{
ngx_array_t *pa;
ngx_table_elt_t *ho, **ph;
pa = (ngx_array_t *) ((char *) &r->headers_out + offset);
if (pa->elts == NULL) {
if (ngx_array_init(pa, r->pool, 2, sizeof(ngx_table_elt_t *)) != NGX_OK)
{
return NGX_ERROR;
}
}
ph = ngx_array_push(pa);
if (ph == NULL) {
return NGX_ERROR;
}
ho = ngx_list_push(&r->headers_out.headers);
if (ho == NULL) {
return NGX_ERROR;
}
*ho = *h;
*ph = ho;
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_copy_content_type(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
u_char *p, *last;
r->headers_out.content_type_len = h->value.len;
r->headers_out.content_type = h->value;
r->headers_out.content_type_lowcase = NULL;
for (p = h->value.data; *p; p++) {
if (*p != ';') {
continue;
}
last = p;
while (*++p == ' ') { /* void */ }
if (*p == '\0') {
return NGX_OK;
}
if (ngx_strncasecmp(p, (u_char *) "charset=", 8) != 0) {
continue;
}
p += 8;
r->headers_out.content_type_len = last - h->value.data;
if (*p == '"') {
p++;
}
last = h->value.data + h->value.len;
if (*(last - 1) == '"') {
last--;
}
r->headers_out.charset.len = last - p;
r->headers_out.charset.data = p;
return NGX_OK;
}
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_copy_content_length(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
ngx_table_elt_t *ho;
ho = ngx_list_push(&r->headers_out.headers);
if (ho == NULL) {
return NGX_ERROR;
}
*ho = *h;
r->headers_out.content_length = ho;
r->headers_out.content_length_n = ngx_atoof(h->value.data, h->value.len);
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_copy_last_modified(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
ngx_table_elt_t *ho;
ho = ngx_list_push(&r->headers_out.headers);
if (ho == NULL) {
return NGX_ERROR;
}
*ho = *h;
r->headers_out.last_modified = ho;
#if (NGX_HTTP_CACHE)
if (r->upstream->cacheable) {
r->headers_out.last_modified_time = ngx_http_parse_time(h->value.data,
h->value.len);
}
#endif
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_rewrite_location(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
ngx_int_t rc;
ngx_table_elt_t *ho;
ho = ngx_list_push(&r->headers_out.headers);
if (ho == NULL) {
return NGX_ERROR;
}
*ho = *h;
if (r->upstream->rewrite_redirect) {
rc = r->upstream->rewrite_redirect(r, ho, 0);
if (rc == NGX_DECLINED) {
return NGX_OK;
}
if (rc == NGX_OK) {
r->headers_out.location = ho;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"rewritten location: \"%V\"", &ho->value);
}
return rc;
}
if (ho->value.data[0] != '/') {
r->headers_out.location = ho;
}
/*
* we do not set r->headers_out.location here to avoid the handling
* the local redirects without a host name by ngx_http_header_filter()
*/
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_rewrite_refresh(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
u_char *p;
ngx_int_t rc;
ngx_table_elt_t *ho;
ho = ngx_list_push(&r->headers_out.headers);
if (ho == NULL) {
return NGX_ERROR;
}
*ho = *h;
if (r->upstream->rewrite_redirect) {
p = ngx_strcasestrn(ho->value.data, "url=", 4 - 1);
if (p) {
rc = r->upstream->rewrite_redirect(r, ho, p + 4 - ho->value.data);
} else {
return NGX_OK;
}
if (rc == NGX_DECLINED) {
return NGX_OK;
}
if (rc == NGX_OK) {
r->headers_out.refresh = ho;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"rewritten refresh: \"%V\"", &ho->value);
}
return rc;
}
r->headers_out.refresh = ho;
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_copy_allow_ranges(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset)
{
ngx_table_elt_t *ho;
#if (NGX_HTTP_CACHE)
if (r->cached) {
r->allow_ranges = 1;
return NGX_OK;
}
#endif
ho = ngx_list_push(&r->headers_out.headers);
if (ho == NULL) {
return NGX_ERROR;
}
*ho = *h;
r->headers_out.accept_ranges = ho;
return NGX_OK;
}
#if (NGX_HTTP_GZIP)
static ngx_int_t
ngx_http_upstream_copy_content_encoding(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset)
{
ngx_table_elt_t *ho;
ho = ngx_list_push(&r->headers_out.headers);
if (ho == NULL) {
return NGX_ERROR;
}
*ho = *h;
r->headers_out.content_encoding = ho;
return NGX_OK;
}
#endif
static ngx_int_t
ngx_http_upstream_add_variables(ngx_conf_t *cf)
{
ngx_http_variable_t *var, *v;
for (v = ngx_http_upstream_vars; v->name.len; v++) {
var = ngx_http_add_variable(cf, &v->name, v->flags);
if (var == NULL) {
return NGX_ERROR;
}
var->get_handler = v->get_handler;
var->data = v->data;
}
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_addr_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
u_char *p;
size_t len;
ngx_uint_t i;
ngx_http_upstream_state_t *state;
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
if (r->upstream_states == NULL || r->upstream_states->nelts == 0) {
v->not_found = 1;
return NGX_OK;
}
len = 0;
state = r->upstream_states->elts;
for (i = 0; i < r->upstream_states->nelts; i++) {
if (state[i].peer) {
len += state[i].peer->len + 2;
} else {
len += 3;
}
}
p = ngx_pnalloc(r->pool, len);
if (p == NULL) {
return NGX_ERROR;
}
v->data = p;
i = 0;
for ( ;; ) {
if (state[i].peer) {
p = ngx_cpymem(p, state[i].peer->data, state[i].peer->len);
}
if (++i == r->upstream_states->nelts) {
break;
}
if (state[i].peer) {
*p++ = ',';
*p++ = ' ';
} else {
*p++ = ' ';
*p++ = ':';
*p++ = ' ';
if (++i == r->upstream_states->nelts) {
break;
}
continue;
}
}
v->len = p - v->data;
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_status_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
u_char *p;
size_t len;
ngx_uint_t i;
ngx_http_upstream_state_t *state;
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
if (r->upstream_states == NULL || r->upstream_states->nelts == 0) {
v->not_found = 1;
return NGX_OK;
}
len = r->upstream_states->nelts * (3 + 2);
p = ngx_pnalloc(r->pool, len);
if (p == NULL) {
return NGX_ERROR;
}
v->data = p;
i = 0;
state = r->upstream_states->elts;
for ( ;; ) {
if (state[i].status) {
p = ngx_sprintf(p, "%ui", state[i].status);
} else {
*p++ = '-';
}
if (++i == r->upstream_states->nelts) {
break;
}
if (state[i].peer) {
*p++ = ',';
*p++ = ' ';
} else {
*p++ = ' ';
*p++ = ':';
*p++ = ' ';
if (++i == r->upstream_states->nelts) {
break;
}
continue;
}
}
v->len = p - v->data;
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_response_time_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
u_char *p;
size_t len;
ngx_uint_t i;
ngx_msec_int_t ms;
ngx_http_upstream_state_t *state;
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
if (r->upstream_states == NULL || r->upstream_states->nelts == 0) {
v->not_found = 1;
return NGX_OK;
}
len = r->upstream_states->nelts * (NGX_TIME_T_LEN + 4 + 2);
p = ngx_pnalloc(r->pool, len);
if (p == NULL) {
return NGX_ERROR;
}
v->data = p;
i = 0;
state = r->upstream_states->elts;
for ( ;; ) {
if (state[i].status) {
ms = (ngx_msec_int_t)
(state[i].response_sec * 1000 + state[i].response_msec);
ms = ngx_max(ms, 0);
p = ngx_sprintf(p, "%d.%03d", ms / 1000, ms % 1000);
} else {
*p++ = '-';
}
if (++i == r->upstream_states->nelts) {
break;
}
if (state[i].peer) {
*p++ = ',';
*p++ = ' ';
} else {
*p++ = ' ';
*p++ = ':';
*p++ = ' ';
if (++i == r->upstream_states->nelts) {
break;
}
continue;
}
}
v->len = p - v->data;
return NGX_OK;
}
static ngx_int_t
ngx_http_upstream_response_length_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
u_char *p;
size_t len;
ngx_uint_t i;
ngx_http_upstream_state_t *state;
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
if (r->upstream_states == NULL || r->upstream_states->nelts == 0) {
v->not_found = 1;
return NGX_OK;
}
len = r->upstream_states->nelts * (NGX_OFF_T_LEN + 2);
p = ngx_pnalloc(r->pool, len);
if (p == NULL) {
return NGX_ERROR;
}
v->data = p;
i = 0;
state = r->upstream_states->elts;
for ( ;; ) {
p = ngx_sprintf(p, "%O", state[i].response_length);
if (++i == r->upstream_states->nelts) {
break;
}
if (state[i].peer) {
*p++ = ',';
*p++ = ' ';
} else {
*p++ = ' ';
*p++ = ':';
*p++ = ' ';
if (++i == r->upstream_states->nelts) {
break;
}
continue;
}
}
v->len = p - v->data;
return NGX_OK;
}
ngx_int_t
ngx_http_upstream_header_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
if (r->upstream == NULL) {
v->not_found = 1;
return NGX_OK;
}
return ngx_http_variable_unknown_header(v, (ngx_str_t *) data,
&r->upstream->headers_in.headers.part,
sizeof("upstream_http_") - 1);
}
#if (NGX_HTTP_CACHE)
ngx_int_t
ngx_http_upstream_cache_status(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
ngx_uint_t n;
if (r->upstream == NULL || r->upstream->cache_status == 0) {
v->not_found = 1;
return NGX_OK;
}
n = r->upstream->cache_status - 1;
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
v->len = ngx_http_cache_status[n].len;
v->data = ngx_http_cache_status[n].data;
return NGX_OK;
}
#endif
static char *
ngx_http_upstream(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy)
{
char *rv;
void *mconf;
ngx_str_t *value;
ngx_url_t u;
ngx_uint_t m;
ngx_conf_t pcf;
ngx_http_module_t *module;
ngx_http_conf_ctx_t *ctx, *http_ctx;
ngx_http_upstream_srv_conf_t *uscf;
ngx_memzero(&u, sizeof(ngx_url_t));
value = cf->args->elts;
u.host = value[1];
u.no_resolve = 1;
uscf = ngx_http_upstream_add(cf, &u, NGX_HTTP_UPSTREAM_CREATE
|NGX_HTTP_UPSTREAM_WEIGHT
|NGX_HTTP_UPSTREAM_MAX_FAILS
|NGX_HTTP_UPSTREAM_FAIL_TIMEOUT
|NGX_HTTP_UPSTREAM_DOWN
|NGX_HTTP_UPSTREAM_BACKUP);
if (uscf == NULL) {
return NGX_CONF_ERROR;
}
ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_conf_ctx_t));
if (ctx == NULL) {
return NGX_CONF_ERROR;
}
http_ctx = cf->ctx;
ctx->main_conf = http_ctx->main_conf;
/* the upstream{}'s srv_conf */
ctx->srv_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
if (ctx->srv_conf == NULL) {
return NGX_CONF_ERROR;
}
ctx->srv_conf[ngx_http_upstream_module.ctx_index] = uscf;
uscf->srv_conf = ctx->srv_conf;
/* the upstream{}'s loc_conf */
ctx->loc_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
if (ctx->loc_conf == NULL) {
return NGX_CONF_ERROR;
}
for (m = 0; ngx_modules[m]; m++) {
if (ngx_modules[m]->type != NGX_HTTP_MODULE) {
continue;
}
module = ngx_modules[m]->ctx;
if (module->create_srv_conf) {
mconf = module->create_srv_conf(cf);
if (mconf == NULL) {
return NGX_CONF_ERROR;
}
ctx->srv_conf[ngx_modules[m]->ctx_index] = mconf;
}
if (module->create_loc_conf) {
mconf = module->create_loc_conf(cf);
if (mconf == NULL) {
return NGX_CONF_ERROR;
}
ctx->loc_conf[ngx_modules[m]->ctx_index] = mconf;
}
}
/* parse inside upstream{} */
pcf = *cf;
cf->ctx = ctx;
cf->cmd_type = NGX_HTTP_UPS_CONF;
rv = ngx_conf_parse(cf, NULL);
*cf = pcf;
if (rv != NGX_CONF_OK) {
return rv;
}
if (uscf->servers == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"no servers are inside upstream");
return NGX_CONF_ERROR;
}
return rv;
}
static char *
ngx_http_upstream_server(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_upstream_srv_conf_t *uscf = conf;
time_t fail_timeout;
ngx_str_t *value, s;
ngx_url_t u;
ngx_int_t weight, max_fails;
ngx_uint_t i;
ngx_http_upstream_server_t *us;
if (uscf->servers == NULL) {
uscf->servers = ngx_array_create(cf->pool, 4,
sizeof(ngx_http_upstream_server_t));
if (uscf->servers == NULL) {
return NGX_CONF_ERROR;
}
}
us = ngx_array_push(uscf->servers);
if (us == NULL) {
return NGX_CONF_ERROR;
}
ngx_memzero(us, sizeof(ngx_http_upstream_server_t));
value = cf->args->elts;
ngx_memzero(&u, sizeof(ngx_url_t));
u.url = value[1];
u.default_port = 80;
if (ngx_parse_url(cf->pool, &u) != NGX_OK) {
if (u.err) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"%s in upstream \"%V\"", u.err, &u.url);
}
return NGX_CONF_ERROR;
}
weight = 1;
max_fails = 1;
fail_timeout = 10;
for (i = 2; i < cf->args->nelts; i++) {
if (ngx_strncmp(value[i].data, "weight=", 7) == 0) {
if (!(uscf->flags & NGX_HTTP_UPSTREAM_WEIGHT)) {
goto invalid;
}
weight = ngx_atoi(&value[i].data[7], value[i].len - 7);
if (weight == NGX_ERROR || weight == 0) {
goto invalid;
}
continue;
}
if (ngx_strncmp(value[i].data, "max_fails=", 10) == 0) {
if (!(uscf->flags & NGX_HTTP_UPSTREAM_MAX_FAILS)) {
goto invalid;
}
max_fails = ngx_atoi(&value[i].data[10], value[i].len - 10);
if (max_fails == NGX_ERROR) {
goto invalid;
}
continue;
}
if (ngx_strncmp(value[i].data, "fail_timeout=", 13) == 0) {
if (!(uscf->flags & NGX_HTTP_UPSTREAM_FAIL_TIMEOUT)) {
goto invalid;
}
s.len = value[i].len - 13;
s.data = &value[i].data[13];
fail_timeout = ngx_parse_time(&s, 1);
if (fail_timeout == NGX_ERROR) {
goto invalid;
}
continue;
}
if (ngx_strncmp(value[i].data, "backup", 6) == 0) {
if (!(uscf->flags & NGX_HTTP_UPSTREAM_BACKUP)) {
goto invalid;
}
us->backup = 1;
continue;
}
if (ngx_strncmp(value[i].data, "down", 4) == 0) {
if (!(uscf->flags & NGX_HTTP_UPSTREAM_DOWN)) {
goto invalid;
}
us->down = 1;
continue;
}
goto invalid;
}
us->addrs = u.addrs;
us->naddrs = u.naddrs;
us->weight = weight;
us->max_fails = max_fails;
us->fail_timeout = fail_timeout;
return NGX_CONF_OK;
invalid:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
ngx_http_upstream_srv_conf_t *
ngx_http_upstream_add(ngx_conf_t *cf, ngx_url_t *u, ngx_uint_t flags)
{
ngx_uint_t i;
ngx_http_upstream_server_t *us;
ngx_http_upstream_srv_conf_t *uscf, **uscfp;
ngx_http_upstream_main_conf_t *umcf;
if (!(flags & NGX_HTTP_UPSTREAM_CREATE)) {
if (ngx_parse_url(cf->pool, u) != NGX_OK) {
if (u->err) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"%s in upstream \"%V\"", u->err, &u->url);
}
return NULL;
}
}
umcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_upstream_module);
uscfp = umcf->upstreams.elts;
for (i = 0; i < umcf->upstreams.nelts; i++) {
if (uscfp[i]->host.len != u->host.len
|| ngx_strncasecmp(uscfp[i]->host.data, u->host.data, u->host.len)
!= 0)
{
continue;
}
if ((flags & NGX_HTTP_UPSTREAM_CREATE)
&& (uscfp[i]->flags & NGX_HTTP_UPSTREAM_CREATE))
{
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"duplicate upstream \"%V\"", &u->host);
return NULL;
}
if ((uscfp[i]->flags & NGX_HTTP_UPSTREAM_CREATE) && u->port) {
ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
"upstream \"%V\" may not have port %d",
&u->host, u->port);
return NULL;
}
if ((flags & NGX_HTTP_UPSTREAM_CREATE) && uscfp[i]->port) {
ngx_log_error(NGX_LOG_WARN, cf->log, 0,
"upstream \"%V\" may not have port %d in %s:%ui",
&u->host, uscfp[i]->port,
uscfp[i]->file_name, uscfp[i]->line);
return NULL;
}
if (uscfp[i]->port != u->port) {
continue;
}
if (uscfp[i]->default_port && u->default_port
&& uscfp[i]->default_port != u->default_port)
{
continue;
}
if (flags & NGX_HTTP_UPSTREAM_CREATE) {
uscfp[i]->flags = flags;
}
return uscfp[i];
}
uscf = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_srv_conf_t));
if (uscf == NULL) {
return NULL;
}
uscf->flags = flags;
uscf->host = u->host;
uscf->file_name = cf->conf_file->file.name.data;
uscf->line = cf->conf_file->line;
uscf->port = u->port;
uscf->default_port = u->default_port;
if (u->naddrs == 1) {
uscf->servers = ngx_array_create(cf->pool, 1,
sizeof(ngx_http_upstream_server_t));
if (uscf->servers == NULL) {
return NGX_CONF_ERROR;
}
us = ngx_array_push(uscf->servers);
if (us == NULL) {
return NGX_CONF_ERROR;
}
ngx_memzero(us, sizeof(ngx_http_upstream_server_t));
us->addrs = u->addrs;
us->naddrs = u->naddrs;
}
uscfp = ngx_array_push(&umcf->upstreams);
if (uscfp == NULL) {
return NULL;
}
*uscfp = uscf;
return uscf;
}
char *
ngx_http_upstream_bind_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf)
{
char *p = conf;
ngx_int_t rc;
ngx_str_t *value;
ngx_addr_t **paddr;
paddr = (ngx_addr_t **) (p + cmd->offset);
*paddr = ngx_palloc(cf->pool, sizeof(ngx_addr_t));
if (*paddr == NULL) {
return NGX_CONF_ERROR;
}
value = cf->args->elts;
rc = ngx_parse_addr(cf->pool, *paddr, value[1].data, value[1].len);
switch (rc) {
case NGX_OK:
(*paddr)->name = value[1];
return NGX_CONF_OK;
case NGX_DECLINED:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid address \"%V\"", &value[1]);
default:
return NGX_CONF_ERROR;
}
}
ngx_int_t
ngx_http_upstream_hide_headers_hash(ngx_conf_t *cf,
ngx_http_upstream_conf_t *conf, ngx_http_upstream_conf_t *prev,
ngx_str_t *default_hide_headers, ngx_hash_init_t *hash)
{
ngx_str_t *h;
ngx_uint_t i, j;
ngx_array_t hide_headers;
ngx_hash_key_t *hk;
if (conf->hide_headers == NGX_CONF_UNSET_PTR
&& conf->pass_headers == NGX_CONF_UNSET_PTR)
{
conf->hide_headers_hash = prev->hide_headers_hash;
if (conf->hide_headers_hash.buckets
#if (NGX_HTTP_CACHE)
&& ((conf->cache == NULL) == (prev->cache == NULL))
#endif
)
{
return NGX_OK;
}
conf->hide_headers = prev->hide_headers;
conf->pass_headers = prev->pass_headers;
} else {
if (conf->hide_headers == NGX_CONF_UNSET_PTR) {
conf->hide_headers = prev->hide_headers;
}
if (conf->pass_headers == NGX_CONF_UNSET_PTR) {
conf->pass_headers = prev->pass_headers;
}
}
if (ngx_array_init(&hide_headers, cf->temp_pool, 4, sizeof(ngx_hash_key_t))
!= NGX_OK)
{
return NGX_ERROR;
}
for (h = default_hide_headers; h->len; h++) {
hk = ngx_array_push(&hide_headers);
if (hk == NULL) {
return NGX_ERROR;
}
hk->key = *h;
hk->key_hash = ngx_hash_key_lc(h->data, h->len);
hk->value = (void *) 1;
}
if (conf->hide_headers != NGX_CONF_UNSET_PTR) {
h = conf->hide_headers->elts;
for (i = 0; i < conf->hide_headers->nelts; i++) {
hk = hide_headers.elts;
for (j = 0; j < hide_headers.nelts; j++) {
if (ngx_strcasecmp(h[i].data, hk[j].key.data) == 0) {
goto exist;
}
}
hk = ngx_array_push(&hide_headers);
if (hk == NULL) {
return NGX_ERROR;
}
hk->key = h[i];
hk->key_hash = ngx_hash_key_lc(h[i].data, h[i].len);
hk->value = (void *) 1;
exist:
continue;
}
}
if (conf->pass_headers != NGX_CONF_UNSET_PTR) {
h = conf->pass_headers->elts;
hk = hide_headers.elts;
for (i = 0; i < conf->pass_headers->nelts; i++) {
for (j = 0; j < hide_headers.nelts; j++) {
if (hk[j].key.data == NULL) {
continue;
}
if (ngx_strcasecmp(h[i].data, hk[j].key.data) == 0) {
hk[j].key.data = NULL;
break;
}
}
}
}
hash->hash = &conf->hide_headers_hash;
hash->key = ngx_hash_key_lc;
hash->pool = cf->pool;
hash->temp_pool = NULL;
return ngx_hash_init(hash, hide_headers.elts, hide_headers.nelts);
}
static void *
ngx_http_upstream_create_main_conf(ngx_conf_t *cf)
{
ngx_http_upstream_main_conf_t *umcf;
umcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_main_conf_t));
if (umcf == NULL) {
return NULL;
}
if (ngx_array_init(&umcf->upstreams, cf->pool, 4,
sizeof(ngx_http_upstream_srv_conf_t *))
!= NGX_OK)
{
return NULL;
}
return umcf;
}
static char *
ngx_http_upstream_init_main_conf(ngx_conf_t *cf, void *conf)
{
ngx_http_upstream_main_conf_t *umcf = conf;
ngx_uint_t i;
ngx_array_t headers_in;
ngx_hash_key_t *hk;
ngx_hash_init_t hash;
ngx_http_upstream_init_pt init;
ngx_http_upstream_header_t *header;
ngx_http_upstream_srv_conf_t **uscfp;
uscfp = umcf->upstreams.elts;
for (i = 0; i < umcf->upstreams.nelts; i++) {
init = uscfp[i]->peer.init_upstream ? uscfp[i]->peer.init_upstream:
ngx_http_upstream_init_round_robin;
if (init(cf, uscfp[i]) != NGX_OK) {
return NGX_CONF_ERROR;
}
}
/* upstream_headers_in_hash */
if (ngx_array_init(&headers_in, cf->temp_pool, 32, sizeof(ngx_hash_key_t))
!= NGX_OK)
{
return NGX_CONF_ERROR;
}
for (header = ngx_http_upstream_headers_in; header->name.len; header++) {
hk = ngx_array_push(&headers_in);
if (hk == NULL) {
return NGX_CONF_ERROR;
}
hk->key = header->name;
hk->key_hash = ngx_hash_key_lc(header->name.data, header->name.len);
hk->value = header;
}
hash.hash = &umcf->headers_in_hash;
hash.key = ngx_hash_key_lc;
hash.max_size = 512;
hash.bucket_size = ngx_align(64, ngx_cacheline_size);
hash.name = "upstream_headers_in_hash";
hash.pool = cf->pool;
hash.temp_pool = NULL;
if (ngx_hash_init(&hash, headers_in.elts, headers_in.nelts) != NGX_OK) {
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}