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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
static ngx_int_t ngx_http_postpone_filter_add(ngx_http_request_t *r,
ngx_chain_t *in);
static ngx_int_t ngx_http_postpone_filter_in_memory(ngx_http_request_t *r,
ngx_chain_t *in);
static ngx_int_t ngx_http_postpone_filter_init(ngx_conf_t *cf);
static ngx_http_module_t ngx_http_postpone_filter_module_ctx = {
NULL, /* preconfiguration */
ngx_http_postpone_filter_init, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
NULL, /* create location configuration */
NULL /* merge location configuration */
};
ngx_module_t ngx_http_postpone_filter_module = {
NGX_MODULE_V1,
&ngx_http_postpone_filter_module_ctx, /* module context */
NULL, /* 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_output_body_filter_pt ngx_http_next_body_filter;
static ngx_int_t
ngx_http_postpone_filter(ngx_http_request_t *r, ngx_chain_t *in)
{
ngx_connection_t *c;
ngx_http_postponed_request_t *pr;
c = r->connection;
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http postpone filter \"%V?%V\" %p", &r->uri, &r->args, in);
if (r->subrequest_in_memory) {
return ngx_http_postpone_filter_in_memory(r, in);
}
if (r != c->data) {
if (in) {
if (ngx_http_postpone_filter_add(r, in) != NGX_OK) {
return NGX_ERROR;
}
return NGX_OK;
}
#if 0
/* TODO: SSI may pass NULL */
ngx_log_error(NGX_LOG_ALERT, c->log, 0,
"http postpone filter NULL inactive request");
#endif
return NGX_OK;
}
if (r->postponed == NULL) {
if (in || c->buffered) {
return ngx_http_next_body_filter(r->main, in);
}
return NGX_OK;
}
if (in) {
if (ngx_http_postpone_filter_add(r, in) != NGX_OK) {
return NGX_ERROR;
}
}
do {
pr = r->postponed;
if (pr->request) {
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http postpone filter wake \"%V?%V\"",
&pr->request->uri, &pr->request->args);
r->postponed = pr->next;
c->data = pr->request;
return ngx_http_post_request(pr->request, NULL);
}
if (pr->out == NULL) {
ngx_log_error(NGX_LOG_ALERT, c->log, 0,
"http postpone filter NULL output");
} else {
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http postpone filter output \"%V?%V\"",
&r->uri, &r->args);
if (ngx_http_next_body_filter(r->main, pr->out) == NGX_ERROR) {
return NGX_ERROR;
}
}
r->postponed = pr->next;
} while (r->postponed);
return NGX_OK;
}
static ngx_int_t
ngx_http_postpone_filter_add(ngx_http_request_t *r, ngx_chain_t *in)
{
ngx_http_postponed_request_t *pr, **ppr;
if (r->postponed) {
for (pr = r->postponed; pr->next; pr = pr->next) { /* void */ }
if (pr->request == NULL) {
goto found;
}
ppr = &pr->next;
} else {
ppr = &r->postponed;
}
pr = ngx_palloc(r->pool, sizeof(ngx_http_postponed_request_t));
if (pr == NULL) {
return NGX_ERROR;
}
*ppr = pr;
pr->request = NULL;
pr->out = NULL;
pr->next = NULL;
found:
if (ngx_chain_add_copy(r->pool, &pr->out, in) == NGX_OK) {
return NGX_OK;
}
return NGX_ERROR;
}
static ngx_int_t
ngx_http_postpone_filter_in_memory(ngx_http_request_t *r, ngx_chain_t *in)
{
size_t len;
ngx_buf_t *b;
ngx_connection_t *c;
ngx_http_core_loc_conf_t *clcf;
c = r->connection;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http postpone filter in memory");
if (r->out == NULL) {
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
if (r->headers_out.content_length_n != -1) {
len = r->headers_out.content_length_n;
if (len > clcf->subrequest_output_buffer_size) {
ngx_log_error(NGX_LOG_ERR, c->log, 0,
"too big subrequest response: %uz", len);
return NGX_ERROR;
}
} else {
len = clcf->subrequest_output_buffer_size;
}
b = ngx_create_temp_buf(r->pool, len);
if (b == NULL) {
return NGX_ERROR;
}
b->last_buf = 1;
r->out = ngx_alloc_chain_link(r->pool);
if (r->out == NULL) {
return NGX_ERROR;
}
r->out->buf = b;
r->out->next = NULL;
}
b = r->out->buf;
for ( /* void */ ; in; in = in->next) {
if (ngx_buf_special(in->buf)) {
continue;
}
len = in->buf->last - in->buf->pos;
if (len > (size_t) (b->end - b->last)) {
ngx_log_error(NGX_LOG_ERR, c->log, 0,
"too big subrequest response");
return NGX_ERROR;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http postpone filter in memory %uz bytes", len);
b->last = ngx_cpymem(b->last, in->buf->pos, len);
in->buf->pos = in->buf->last;
}
return NGX_OK;
}
static ngx_int_t
ngx_http_postpone_filter_init(ngx_conf_t *cf)
{
ngx_http_next_body_filter = ngx_http_top_body_filter;
ngx_http_top_body_filter = ngx_http_postpone_filter;
return NGX_OK;
}
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