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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
static ngx_int_t ngx_http_postpone_filter_init(ngx_cycle_t *cycle);
static ngx_http_module_t ngx_http_postpone_filter_module_ctx = {
NULL, /* preconfiguration */
NULL, /* 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 */
ngx_http_postpone_filter_init, /* init module */
NULL /* init process */
};
static ngx_http_output_body_filter_pt ngx_http_next_filter;
static ngx_int_t
ngx_http_postpone_filter(ngx_http_request_t *r, ngx_chain_t *in)
{
ngx_int_t rc;
ngx_chain_t *out;
ngx_http_postponed_request_t *pr, **ppr;
if (r->connection->write->error) {
return NGX_ERROR;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http postpone filter \"%V\" %p", &r->uri, in);
if (r != r->connection->data || (r->postponed && in)) {
if (r->postponed) {
for (pr = r->postponed; pr->next; pr = pr->next) { /* void */ }
ppr = pr->request ? &pr->next : NULL;
} else {
ppr = &r->postponed;
#if (NGX_SUPPRESS_WARN)
pr = NULL;
#endif
}
if (ppr) {
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;
}
if (ngx_chain_add_copy(r->pool, &pr->out, in) == NGX_ERROR) {
return NGX_ERROR;
}
if (r != r->connection->data || r->postponed->request) {
return NGX_AGAIN;
}
}
if (r->postponed) {
out = r->postponed->out;
r->postponed = r->postponed->next;
} else {
out = in;
}
if (out == NULL && r->out == NULL) {
return NGX_OK;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http postpone filter out \"%V\"", &r->uri);
rc = ngx_http_next_filter(r->main ? r->main : r, out);
if (rc == NGX_ERROR) {
/* NGX_ERROR may be returned by any filter */
r->connection->write->error = 1;
}
return rc;
}
static ngx_int_t
ngx_http_postpone_filter_init(ngx_cycle_t *cycle)
{
ngx_http_next_filter = ngx_http_top_body_filter;
ngx_http_top_body_filter = ngx_http_postpone_filter;
return NGX_OK;
}
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