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nginx / nginx / refs/heads/stable-0.5 / . / src / http / ngx_http_upstream.c
blob: 08f81013e3db2cac488ad11394ec4b8553bdf3a1 [file] [log] [blame]
/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
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_event_t *wev);
static void ngx_http_upstream_process_header(ngx_event_t *rev);
static ngx_int_t ngx_http_upstream_test_connect(ngx_connection_t *c);
static void ngx_http_upstream_process_body_in_memory(ngx_event_t *rev);
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_body(ngx_event_t *ev);
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_body(ngx_event_t *ev);
static void ngx_http_upstream_store(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static void ngx_http_upstream_dummy_handler(ngx_event_t *wev);
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_multi_header_lines(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_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_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);
#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 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_header_line,
offsetof(ngx_http_headers_out_t, last_modified), 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_ignore_header_line, 0,
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_ignore_header_line, 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_multi_header_lines,
offsetof(ngx_http_upstream_headers_in_t, cache_control),
ngx_http_upstream_copy_multi_header_lines,
offsetof(ngx_http_headers_out_t, cache_control), 1 },
{ ngx_string("Expires"),
ngx_http_upstream_process_header_line,
offsetof(ngx_http_upstream_headers_in_t, expires),
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_header_line,
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_header_line,
offsetof(ngx_http_upstream_headers_in_t, x_accel_expires),
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_ignore_header_line, 0, 0 },
{ ngx_string("X-Accel-Limit-Rate"),
ngx_http_upstream_process_limit_rate, 0,
ngx_http_upstream_ignore_header_line, 0, 0 },
{ ngx_string("X-Accel-Buffering"),
ngx_http_upstream_process_buffering, 0,
ngx_http_upstream_ignore_header_line, 0, 0 },
{ ngx_string("X-Accel-Charset"),
ngx_http_upstream_process_charset, 0,
ngx_http_upstream_ignore_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_NOHASH, 0 },
{ ngx_string("upstream_status"), NULL,
ngx_http_upstream_status_variable, 0, NGX_HTTP_VAR_NOHASH, 0 },
{ ngx_string("upstream_response_time"), NULL,
ngx_http_upstream_response_time_variable, 0, NGX_HTTP_VAR_NOHASH, 0 },
{ ngx_null_string, NULL, NULL, 0, 0, 0 }
};
void
ngx_http_upstream_init(ngx_http_request_t *r)
{
ngx_connection_t *c;
ngx_http_cleanup_t *cln;
ngx_http_upstream_t *u;
ngx_http_core_loc_conf_t *clcf;
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);
}
u = r->upstream;
if (!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 (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;
}
}
}
if (r->request_body) {
u->request_bufs = r->request_body->bufs;
}
if (u->conf->upstream->peer.init(r, u->conf->upstream) != NGX_OK) {
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
if (u->create_request(r) != NGX_OK) {
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
u->output.sendfile = r->connection->sendfile;
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;
u->store = (u->conf->store || u->conf->store_lengths);
ngx_http_upstream_connect(r, u);
}
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_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) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_CLIENT_CLOSED_REQUEST);
return;
}
if (u->peer.connection == NULL) {
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->store && u->peer.connection) {
ngx_log_error(NGX_LOG_INFO, ev->log, ev->kq_errno,
"kevent() reported that client closed prematurely "
"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 closed "
"prematurely connection");
if (u->peer.connection == NULL) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_CLIENT_CLOSED_REQUEST);
return;
}
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);
/*
* we do not need to disable the write event because
* that event has NGX_USE_CLEAR_EVENT type
*/
if (ev->write && (n >= 0 || err == NGX_EAGAIN)) {
return;
}
if ((ngx_event_flags & NGX_USE_LEVEL_EVENT) && ev->active) {
if (ngx_del_event(ev, NGX_READ_EVENT, 0) == NGX_ERROR) {
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->store && u->peer.connection) {
ngx_log_error(NGX_LOG_INFO, ev->log, err,
"client closed prematurely 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 closed prematurely connection");
if (u->peer.connection == NULL) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_CLIENT_CLOSED_REQUEST);
return;
}
}
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");
}
if (rc == NGX_BUSY || 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_send_request_handler;
c->read->handler = ngx_http_upstream_process_header;
c->sendfile &= r->connection->sendfile;
c->pool = r->pool;
c->read->log = c->write->log = c->log = r->connection->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->conf->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_ERROR)
{
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
c->sendfile = 0;
u->output.sendfile = 0;
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) {
u->peer.save_session(&u->peer, u->peer.data);
c->write->handler = ngx_http_upstream_send_request_handler;
c->read->handler = ngx_http_upstream_process_header;
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(&r->upstream->headers_in,
sizeof(ngx_http_upstream_headers_in_t));
if (ngx_list_init(&r->upstream->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 */
#if 0
if (u->cache) {
u->buffer.pos = u->buffer.start + u->cache->ctx.header_size;
u->buffer.last = u->buffer.pos;
} else {
u->buffer.pos = u->buffer.start;
u->buffer.last = u->buffer.start;
}
#else
u->buffer.pos = u->buffer.start;
u->buffer.last = u->buffer.start;
#endif
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_ERROR)
{
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(c->read);
return;
}
#endif
c->write->handler = ngx_http_upstream_dummy_handler;
if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
}
static void
ngx_http_upstream_send_request_handler(ngx_event_t *wev)
{
ngx_connection_t *c;
ngx_http_request_t *r;
ngx_http_upstream_t *u;
c = wev->data;
r = c->data;
u = r->upstream;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, wev->log, 0,
"http upstream send request handler");
if (wev->timedout) {
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_TIMEOUT);
return;
}
#if (NGX_HTTP_SSL)
if (u->conf->ssl && c->ssl == NULL) {
ngx_http_upstream_ssl_init_connection(r, u, c);
return;
}
#endif
if (u->header_sent) {
wev->handler = ngx_http_upstream_dummy_handler;
(void) ngx_handle_write_event(wev, 0);
return;
}
ngx_http_upstream_send_request(r, u);
}
static void
ngx_http_upstream_process_header(ngx_event_t *rev)
{
ssize_t n;
ngx_int_t rc;
ngx_str_t *uri, args;
ngx_uint_t i, flags;
ngx_list_part_t *part;
ngx_table_elt_t *h;
ngx_connection_t *c;
ngx_http_request_t *r;
ngx_http_upstream_t *u;
ngx_http_err_page_t *err_page;
ngx_http_core_loc_conf_t *clcf;
ngx_http_upstream_header_t *hh;
ngx_http_upstream_main_conf_t *umcf;
c = rev->data;
r = c->data;
u = r->upstream;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0,
"http upstream process header");
c->log->action = "reading response header from upstream";
if (rev->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(&r->upstream->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 0
if (u->cache) {
u->buffer.pos += u->cache->ctx.header_size;
u->buffer.last = u->buffer.pos;
}
#endif
}
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(rev, 0) == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
return;
}
if (n == 0) {
ngx_log_error(NGX_LOG_ERR, rev->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 0
ngx_add_timer(rev, u->read_timeout);
#endif
if (u->buffer.pos == u->buffer.end) {
ngx_log_error(NGX_LOG_ERR, rev->log, 0,
"upstream sent too big header");
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_INVALID_HEADER);
return;
}
if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
return;
}
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_BAD_REQUEST
&& r->subrequest_in_memory)
{
u->buffer.last = u->buffer.pos;
}
if (u->headers_in.status_n == NGX_HTTP_INTERNAL_SERVER_ERROR) {
if (u->peer.tries > 1
&& (u->conf->next_upstream & NGX_HTTP_UPSTREAM_FT_HTTP_500))
{
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_HTTP_500);
return;
}
#if (NGX_HTTP_CACHE)
if (u->peer.tries == 0
&& u->stale
&& (u->conf->use_stale & NGX_HTTP_UPSTREAM_FT_HTTP_500))
{
ngx_http_upstream_finalize_request(r, u,
ngx_http_send_cached_response(r));
return;
}
#endif
}
if (u->headers_in.status_n == NGX_HTTP_NOT_FOUND) {
if (u->peer.tries > 1
&& u->conf->next_upstream & NGX_HTTP_UPSTREAM_FT_HTTP_404)
{
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_HTTP_404);
return;
}
if (u->conf->intercept_404) {
ngx_http_upstream_finalize_request(r, u, NGX_HTTP_NOT_FOUND);
return;
}
}
if (u->headers_in.status_n >= NGX_HTTP_BAD_REQUEST
&& u->conf->intercept_errors)
{
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
if (clcf->error_pages) {
err_page = clcf->error_pages->elts;
for (i = 0; i < clcf->error_pages->nelts; i++) {
if (err_page[i].status == (ngx_int_t) u->headers_in.status_n) {
if (u->headers_in.status_n == NGX_HTTP_UNAUTHORIZED) {
r->headers_out.www_authenticate =
ngx_list_push(&r->headers_out.headers);
if (r->headers_out.www_authenticate == NULL) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
*r->headers_out.www_authenticate =
*u->headers_in.www_authenticate;
}
ngx_http_upstream_finalize_request(r, u,
u->headers_in.status_n);
return;
}
}
}
}
umcf = ngx_http_get_module_main_conf(r, ngx_http_upstream_module);
if (r->upstream->headers_in.x_accel_redirect) {
ngx_http_upstream_finalize_request(r, u, NGX_DECLINED);
part = &r->upstream->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;
}
}
}
uri = &r->upstream->headers_in.x_accel_redirect->value;
args.len = 0;
args.data = NULL;
flags = 0;
if (ngx_http_parse_unsafe_uri(r, uri, &args, &flags) != NGX_OK) {
ngx_http_finalize_request(r, NGX_HTTP_NOT_FOUND);
return;
}
if (flags & NGX_HTTP_ZERO_IN_URI) {
r->zero_in_uri = 1;
}
if (r->method != NGX_HTTP_HEAD) {
r->method = NGX_HTTP_GET;
}
ngx_http_internal_redirect(r, uri, &args);
return;
}
part = &r->upstream->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;
}
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;
}
}
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;
}
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;
}
if (u->buffer.last - u->buffer.pos >= (ssize_t) u->length) {
if (u->input_filter(u->input_filter_ctx, 0) == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
return;
}
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
rev->handler = ngx_http_upstream_process_body_in_memory;
ngx_http_upstream_process_body_in_memory(rev);
}
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 void
ngx_http_upstream_process_body_in_memory(ngx_event_t *rev)
{
size_t size;
ssize_t n;
ngx_buf_t *b;
ngx_connection_t *c;
ngx_http_request_t *r;
ngx_http_upstream_t *u;
c = rev->data;
r = c->data;
u = r->upstream;
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 repsonse");
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;
}
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_ERROR) {
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 size;
ngx_int_t rc;
ngx_event_pipe_t *p;
ngx_connection_t *c;
ngx_pool_cleanup_t *cl;
ngx_pool_cleanup_file_t *clf;
ngx_http_core_loc_conf_t *clcf;
rc = ngx_http_send_header(r);
if (rc == NGX_ERROR || rc > NGX_OK || r->post_action || r->header_only) {
ngx_http_upstream_finalize_request(r, u, rc);
return;
}
u->header_sent = 1;
if (r->request_body && r->request_body->temp_file) {
for (cl = r->pool->cleanup; cl; cl = cl->next) {
if (cl->handler == ngx_pool_cleanup_file) {
clf = cl->data;
if (clf->fd == r->request_body->temp_file->file.fd) {
cl->handler(clf);
cl->handler = NULL;
r->request_body->temp_file->file.fd = NGX_INVALID_FILE;
break;
}
}
}
}
c = r->connection;
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->peer.connection->read->handler =
ngx_http_upstream_process_non_buffered_body;
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;
}
size = u->buffer.last - u->buffer.pos;
if (size) {
u->buffer.last = u->buffer.pos;
if (u->input_filter(u->input_filter_ctx, size) == NGX_ERROR) {
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
ngx_http_upstream_process_non_buffered_body(c->write);
} 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_body(
u->peer.connection->read);
}
}
return;
}
/* TODO: preallocate event_pipe bufs, look "Content-Length" */
#if 0
if (u->cache && u->cache->ctx.file.fd != NGX_INVALID_FILE) {
if (ngx_close_file(u->cache->ctx.file.fd) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
ngx_close_file_n " \"%s\" failed",
u->cache->ctx.file.name.data);
}
}
if (u->cacheable) {
header = (ngx_http_cache_header_t *) u->buffer->start;
header->expires = u->cache->ctx.expires;
header->last_modified = u->cache->ctx.last_modified;
header->date = u->cache->ctx.date;
header->length = r->headers_out.content_length_n;
u->cache->ctx.length = r->headers_out.content_length_n;
header->key_len = u->cache->ctx.key0.len;
ngx_memcpy(&header->key, u->cache->ctx.key0.data, header->key_len);
header->key[header->key_len] = LF;
}
#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 (u->cacheable || u->store) {
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->peer.connection->read->handler = ngx_http_upstream_process_body;
r->write_event_handler = ngx_http_upstream_process_downstream;
ngx_http_upstream_process_body(u->peer.connection->read);
}
static void
ngx_http_upstream_process_non_buffered_downstream(ngx_http_request_t *r)
{
ngx_http_upstream_process_non_buffered_body(r->connection->write);
}
static void
ngx_http_upstream_process_non_buffered_body(ngx_event_t *ev)
{
size_t size;
ssize_t n;
ngx_buf_t *b;
ngx_int_t rc;
ngx_uint_t do_write;
ngx_connection_t *c, *downstream, *upstream;
ngx_http_request_t *r;
ngx_http_upstream_t *u;
ngx_http_core_loc_conf_t *clcf;
c = ev->data;
r = c->data;
u = r->upstream;
if (ev->write) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http upstream process non buffered downstream");
c->log->action = "sending to client";
} else {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http upstream process non buffered upstream");
c->log->action = "reading upstream";
}
if (ev->timedout) {
if (ev->write) {
c->timedout = 1;
ngx_connection_error(c, NGX_ETIMEDOUT, "client timed out");
} else {
ngx_connection_error(c, NGX_ETIMEDOUT, "upstream timed out");
}
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
downstream = r->connection;
upstream = u->peer.connection;
b = &u->buffer;
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
do_write = ev->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 (downstream->destroyed) {
return;
}
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) {
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;
}
if (downstream->data == r) {
if (ngx_handle_write_event(downstream->write, clcf->send_lowat)
== NGX_ERROR)
{
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_ERROR) {
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;
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_http_upstream_process_body(r->connection->write);
}
static void
ngx_http_upstream_process_body(ngx_event_t *ev)
{
ngx_temp_file_t *tf;
ngx_event_pipe_t *p;
ngx_connection_t *c, *downstream;
ngx_http_log_ctx_t *ctx;
ngx_http_request_t *r;
ngx_http_upstream_t *u;
c = ev->data;
r = c->data;
u = r->upstream;
downstream = r->connection;
if (ev->write) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http upstream process downstream");
c->log->action = "sending to client";
} else {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http upstream process upstream");
c->log->action = "reading upstream";
ctx = c->log->data;
ctx->current_request = r;
}
p = u->pipe;
if (ev->timedout) {
if (ev->write) {
if (ev->delayed) {
ev->timedout = 0;
ev->delayed = 0;
if (!ev->ready) {
ngx_add_timer(ev, p->send_timeout);
if (ngx_handle_write_event(ev, p->send_lowat) == NGX_ERROR)
{
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
return;
}
if (ngx_event_pipe(p, ev->write) == NGX_ABORT) {
if (downstream->destroyed) {
return;
}
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 {
p->upstream_error = 1;
ngx_connection_error(c, NGX_ETIMEDOUT, "upstream timed out");
}
} else {
if (ev->write && ev->delayed) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http downstream delayed");
if (ngx_handle_write_event(ev, p->send_lowat) == NGX_ERROR) {
return;
}
return;
}
if (ngx_event_pipe(p, ev->write) == NGX_ABORT) {
if (downstream->destroyed) {
return;
}
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
}
if (u->peer.connection) {
if (u->store) {
tf = u->pipe->temp_file;
if (p->upstream_eof
&& 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 if ((p->upstream_error
|| (p->upstream_eof
&& u->headers_in.status_n != NGX_HTTP_OK))
&& 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_FILE_CACHE)
if (p->upstream_done && u->cacheable) {
if (ngx_http_cache_update(r) == NGX_ERROR) {
ngx_http_busy_unlock(u->conf->busy_lock, &u->busy_lock);
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
} else if (p->upstream_eof && u->cacheable) {
/* TODO: check length & update cache */
if (ngx_http_cache_update(r) == NGX_ERROR) {
ngx_http_busy_unlock(u->conf->busy_lock, &u->busy_lock);
ngx_http_upstream_finalize_request(r, u, 0);
return;
}
}
#endif
if (p->upstream_done || p->upstream_eof || p->upstream_error) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->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, c->log, 0,
"http upstream downstream error");
if (!u->cacheable && 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)
{
char *failed;
u_char *name;
size_t root;
time_t lm;
ngx_err_t err;
ngx_str_t *temp, path, *last_modified;
ngx_temp_file_t *tf;
if (u->pipe->temp_file->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;
}
temp = &u->pipe->temp_file->file.name;
#if !(NGX_WIN32)
if (ngx_change_file_access(temp->data, u->conf->store_access)
== NGX_FILE_ERROR)
{
err = ngx_errno;
failed = ngx_change_file_access_n;
name = temp->data;
goto failed;
}
#endif
if (r->upstream->headers_in.last_modified) {
last_modified = &r->upstream->headers_in.last_modified->value;
lm = ngx_http_parse_time(last_modified->data, last_modified->len);
if (lm != NGX_ERROR) {
if (ngx_set_file_time(temp->data, u->pipe->temp_file->file.fd, lm)
!= NGX_OK)
{
err = ngx_errno;
failed = ngx_set_file_time_n;
name = temp->data;
goto failed;
}
}
}
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;
}
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"upstream stores \"%s\" to \"%s\"", temp->data, path.data);
failed = ngx_rename_file_n;
name = path.data;
if (ngx_rename_file(temp->data, path.data) != NGX_FILE_ERROR) {
return;
}
err = ngx_errno;
if (err == NGX_ENOENT) {
err = ngx_create_full_path(path.data,
ngx_dir_access(u->conf->store_access));
if (err == 0) {
if (ngx_rename_file(temp->data, path.data) != NGX_FILE_ERROR) {
return;
}
err = ngx_errno;
}
}
#if (NGX_WIN32)
if (err == NGX_EEXIST) {
if (ngx_win32_rename_file(temp, &path, r->pool) != NGX_ERROR) {
if (ngx_rename_file(temp->data, path.data) != NGX_FILE_ERROR) {
return;
}
}
err = ngx_errno;
}
#endif
failed:
if (ngx_delete_file(temp->data) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
ngx_delete_file_n " \"%s\" failed",
temp->data);
}
ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
"%s \"%s\" failed", failed, name);
}
static void
ngx_http_upstream_dummy_handler(ngx_event_t *wev)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, wev->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;
}
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->stale && (u->conf->use_stale & ft_type)) {
ngx_http_upstream_finalize_request(r, u,
ngx_http_send_cached_response(r));
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);
}
#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_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"cleanup http upstream request: \"%V\"", &r->uri);
ngx_http_upstream_finalize_request(r, r->upstream, 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);
*u->cleanup = NULL;
if (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->finalize_request(r, rc);
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->header_sent && (rc == NGX_ERROR || rc >= NGX_HTTP_SPECIAL_RESPONSE))
{
rc = 0;
}
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 0
if (u->cache) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http upstream cache fd: %d",
u->cache->ctx.file.fd);
}
#endif
if (rc == NGX_DECLINED) {
return;
}
r->connection->log->action = "sending to client";
if (rc == 0) {
if (r == r->main) {
if (!r->post_action) {
rc = ngx_http_send_special(r, NGX_HTTP_LAST);
}
} else {
if (r->out) {
rc = NGX_AGAIN;
}
}
}
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_process_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 **ph;
pa = (ngx_array_t *) ((char *) &r->upstream->headers_in + 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;
}
*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_limit_rate(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
ngx_int_t n;
r->upstream->headers_in.x_accel_limit_rate = h;
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;
if (r->upstream->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') {
r->upstream->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') {
r->upstream->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)
{
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;
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;
r->headers_out.charset.len = h->value.data + h->value.len - 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_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;
}
/*
* 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 (NGX_DEBUG)
if (rc == NGX_OK) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"rewritten refresh: \"%V\"", &ho->value);
}
#endif
return rc;
}
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_palloc(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_palloc(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_palloc(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 = state[i].response_sec * 1000 + state[i].response_msec;
ms = (ms >= 0) ? 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;
}
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);
}
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 < 0) {
goto invalid;
}
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;
}
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;
}
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) {
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 NGX_CONF_ERROR;
}
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;
}