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/*
* Copyright (c) 2010, FRiCKLE Piotr Sikora <info@frickle.com>
* Copyright (c) 2009-2010, Xiaozhe Wang <chaoslawful@gmail.com>
* Copyright (c) 2009-2010, Yichun Zhang <agentzh@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef DDEBUG
#define DDEBUG 0
#endif
#include "ngx_postgres_ddebug.h"
#include "ngx_postgres_handler.h"
#include "ngx_postgres_module.h"
#include "ngx_postgres_output.h"
#include "ngx_postgres_processor.h"
#include "ngx_postgres_util.h"
ngx_int_t
ngx_postgres_handler(ngx_http_request_t *r)
{
ngx_postgres_loc_conf_t *pglcf;
ngx_postgres_ctx_t *pgctx;
ngx_http_core_loc_conf_t *clcf;
ngx_http_upstream_t *u;
ngx_connection_t *c;
ngx_str_t host;
ngx_url_t url;
ngx_int_t rc;
dd("entering");
if (r->subrequest_in_memory) {
/* TODO: add support for subrequest in memory by
* emitting output into u->buffer instead */
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"postgres: ngx_postgres module does not support"
" subrequests in memory");
dd("returning NGX_HTTP_INTERNAL_SERVER_ERROR");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
pglcf = ngx_http_get_module_loc_conf(r, ngx_postgres_module);
if ((pglcf->query.def == NULL) && !(pglcf->query.methods_set & r->method)) {
if (pglcf->query.methods_set != 0) {
dd("returning NGX_HTTP_NOT_ALLOWED");
return NGX_HTTP_NOT_ALLOWED;
}
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"postgres: missing \"postgres_query\" in location \"%V\"",
&clcf->name);
dd("returning NGX_HTTP_INTERNAL_SERVER_ERROR");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
rc = ngx_http_discard_request_body(r);
if (rc != NGX_OK) {
dd("returning rc:%d", (int) rc);
return rc;
}
#if defined(nginx_version) \
&& (((nginx_version >= 7063) && (nginx_version < 8000)) \
|| (nginx_version >= 8007))
if (ngx_http_upstream_create(r) != NGX_OK) {
dd("returning NGX_HTTP_INTERNAL_SERVER_ERROR");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
u = r->upstream;
#else /* 0.7.x < 0.7.63, 0.8.x < 0.8.7 */
u = ngx_pcalloc(r->pool, sizeof(ngx_http_upstream_t));
if (u == NULL) {
dd("returning NGX_HTTP_INTERNAL_SERVER_ERROR");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
u->peer.log = r->connection->log;
u->peer.log_error = NGX_ERROR_ERR;
# if (NGX_THREADS)
u->peer.lock = &r->connection->lock;
# endif
r->upstream = u;
#endif
if (pglcf->upstream_cv) {
/* use complex value */
if (ngx_http_complex_value(r, pglcf->upstream_cv, &host) != NGX_OK) {
dd("returning NGX_HTTP_INTERNAL_SERVER_ERROR");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (host.len == 0) {
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"postgres: empty \"postgres_pass\" (was: \"%V\")"
" in location \"%V\"", &pglcf->upstream_cv->value,
&clcf->name);
dd("returning NGX_HTTP_INTERNAL_SERVER_ERROR");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ngx_memzero(&url, sizeof(ngx_url_t));
url.host = host;
url.no_resolve = 1;
pglcf->upstream.upstream = ngx_postgres_find_upstream(r, &url);
if (pglcf->upstream.upstream == NULL) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"postgres: upstream name \"%V\" not found", &host);
dd("returning NGX_ERROR");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
}
pgctx = ngx_pcalloc(r->pool, sizeof(ngx_postgres_ctx_t));
if (pgctx == NULL) {
dd("returning NGX_HTTP_INTERNAL_SERVER_ERROR");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
/*
* set by ngx_pcalloc():
*
* pgctx->response = NULL
* pgctx->var_query = { 0, NULL }
* pgctx->variables = NULL
* pgctx->status = 0
*/
pgctx->var_cols = NGX_ERROR;
pgctx->var_rows = NGX_ERROR;
pgctx->var_affected = NGX_ERROR;
if (pglcf->variables != NULL) {
pgctx->variables = ngx_array_create(r->pool, pglcf->variables->nelts,
sizeof(ngx_str_t));
if (pgctx->variables == NULL) {
dd("returning NGX_HTTP_INTERNAL_SERVER_ERROR");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
/* fake ngx_array_push'ing */
pgctx->variables->nelts = pglcf->variables->nelts;
ngx_memzero(pgctx->variables->elts,
pgctx->variables->nelts * pgctx->variables->size);
}
ngx_http_set_ctx(r, pgctx, ngx_postgres_module);
u->schema.len = sizeof("postgres://") - 1;
u->schema.data = (u_char *) "postgres://";
u->output.tag = (ngx_buf_tag_t) &ngx_postgres_module;
u->conf = &pglcf->upstream;
u->create_request = ngx_postgres_create_request;
u->reinit_request = ngx_postgres_reinit_request;
u->process_header = ngx_postgres_process_header;
u->abort_request = ngx_postgres_abort_request;
u->finalize_request = ngx_postgres_finalize_request;
/* we bypass the upstream input filter mechanism in
* ngx_http_upstream_process_headers */
u->input_filter_init = ngx_postgres_input_filter_init;
u->input_filter = ngx_postgres_input_filter;
u->input_filter_ctx = NULL;
#if defined(nginx_version) && (nginx_version >= 8011)
r->main->count++;
#endif
ngx_http_upstream_init(r);
/* override the read/write event handler to our own */
u->write_event_handler = ngx_postgres_wev_handler;
u->read_event_handler = ngx_postgres_rev_handler;
/* a bit hack-ish way to return error response (clean-up part) */
if ((u->peer.connection) && (u->peer.connection->fd == 0)) {
c = u->peer.connection;
u->peer.connection = NULL;
if (c->write->timer_set) {
ngx_del_timer(c->write);
}
#if defined(nginx_version) && (nginx_version >= 1001004)
if (c->pool) {
ngx_destroy_pool(c->pool);
}
#endif
ngx_free_connection(c);
ngx_postgres_upstream_finalize_request(r, u,
#if defined(nginx_version) && (nginx_version >= 8017)
NGX_HTTP_SERVICE_UNAVAILABLE);
#else
pgctx->status ? pgctx->status : NGX_HTTP_INTERNAL_SERVER_ERROR);
#endif
}
dd("returning NGX_DONE");
return NGX_DONE;
}
void
ngx_postgres_wev_handler(ngx_http_request_t *r, ngx_http_upstream_t *u)
{
ngx_connection_t *pgxc;
dd("entering");
/* just to ensure u->reinit_request always gets called for
* upstream_next */
u->request_sent = 1;
pgxc = u->peer.connection;
if (pgxc->write->timedout) {
dd("postgres connection write timeout");
ngx_postgres_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_TIMEOUT);
dd("returning");
return;
}
if (ngx_postgres_upstream_test_connect(pgxc) != NGX_OK) {
dd("postgres connection is broken");
ngx_postgres_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR);
dd("returning");
return;
}
ngx_postgres_process_events(r);
dd("returning");
}
void
ngx_postgres_rev_handler(ngx_http_request_t *r, ngx_http_upstream_t *u)
{
ngx_connection_t *pgxc;
dd("entering");
/* just to ensure u->reinit_request always gets called for
* upstream_next */
u->request_sent = 1;
pgxc = u->peer.connection;
if (pgxc->read->timedout) {
dd("postgres connection read timeout");
ngx_postgres_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_TIMEOUT);
dd("returning");
return;
}
if (ngx_postgres_upstream_test_connect(pgxc) != NGX_OK) {
dd("postgres connection is broken");
ngx_postgres_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR);
dd("returning");
return;
}
ngx_postgres_process_events(r);
dd("returning");
}
ngx_int_t
ngx_postgres_create_request(ngx_http_request_t *r)
{
dd("entering");
r->upstream->request_bufs = NULL;
dd("returning NGX_OK");
return NGX_OK;
}
ngx_int_t
ngx_postgres_reinit_request(ngx_http_request_t *r)
{
ngx_http_upstream_t *u;
dd("entering");
u = r->upstream;
/* override the read/write event handler to our own */
u->write_event_handler = ngx_postgres_wev_handler;
u->read_event_handler = ngx_postgres_rev_handler;
dd("returning NGX_OK");
return NGX_OK;
}
void
ngx_postgres_abort_request(ngx_http_request_t *r)
{
dd("entering & returning (dummy function)");
}
void
ngx_postgres_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
{
ngx_postgres_ctx_t *pgctx;
dd("entering");
if (rc == NGX_OK) {
pgctx = ngx_http_get_module_ctx(r, ngx_postgres_module);
ngx_postgres_output_chain(r, pgctx->response);
}
dd("returning");
}
ngx_int_t
ngx_postgres_process_header(ngx_http_request_t *r)
{
dd("entering");
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"postgres: ngx_postgres_process_header should not"
" be called by the upstream");
dd("returning NGX_ERROR");
return NGX_ERROR;
}
ngx_int_t
ngx_postgres_input_filter_init(void *data)
{
ngx_http_request_t *r = data;
dd("entering");
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"postgres: ngx_postgres_input_filter_init should not"
" be called by the upstream");
dd("returning NGX_ERROR");
return NGX_ERROR;
}
ngx_int_t
ngx_postgres_input_filter(void *data, ssize_t bytes)
{
ngx_http_request_t *r = data;
dd("entering");
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"postgres: ngx_postgres_input_filter should not"
" be called by the upstream");
dd("returning NGX_ERROR");
return NGX_ERROR;
}
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