mirror of https://github.com/nginx/nginx.git
260 lines
6.5 KiB
C
260 lines
6.5 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) Nginx, Inc.
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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static ngx_int_t ngx_http_postpone_filter_add(ngx_http_request_t *r,
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ngx_chain_t *in);
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static ngx_int_t ngx_http_postpone_filter_in_memory(ngx_http_request_t *r,
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ngx_chain_t *in);
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static ngx_int_t ngx_http_postpone_filter_init(ngx_conf_t *cf);
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static ngx_http_module_t ngx_http_postpone_filter_module_ctx = {
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NULL, /* preconfiguration */
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ngx_http_postpone_filter_init, /* postconfiguration */
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NULL, /* create main configuration */
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NULL, /* init main configuration */
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NULL, /* create server configuration */
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NULL, /* merge server configuration */
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NULL, /* create location configuration */
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NULL /* merge location configuration */
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};
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ngx_module_t ngx_http_postpone_filter_module = {
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NGX_MODULE_V1,
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&ngx_http_postpone_filter_module_ctx, /* module context */
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NULL, /* module directives */
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NGX_HTTP_MODULE, /* module type */
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NULL, /* init master */
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NULL, /* init module */
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NULL, /* init process */
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NULL, /* init thread */
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NULL, /* exit thread */
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NULL, /* exit process */
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NULL, /* exit master */
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NGX_MODULE_V1_PADDING
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};
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static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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static ngx_int_t
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ngx_http_postpone_filter(ngx_http_request_t *r, ngx_chain_t *in)
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{
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ngx_connection_t *c;
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ngx_http_postponed_request_t *pr;
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c = r->connection;
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ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
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"http postpone filter \"%V?%V\" %p", &r->uri, &r->args, in);
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if (r->subrequest_in_memory) {
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return ngx_http_postpone_filter_in_memory(r, in);
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}
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if (r != c->data) {
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if (in) {
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if (ngx_http_postpone_filter_add(r, in) != NGX_OK) {
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return NGX_ERROR;
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}
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return NGX_OK;
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}
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#if 0
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/* TODO: SSI may pass NULL */
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ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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"http postpone filter NULL inactive request");
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#endif
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return NGX_OK;
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}
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if (r->postponed == NULL) {
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if (in || c->buffered) {
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return ngx_http_next_body_filter(r->main, in);
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}
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return NGX_OK;
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}
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if (in) {
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if (ngx_http_postpone_filter_add(r, in) != NGX_OK) {
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return NGX_ERROR;
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}
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}
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do {
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pr = r->postponed;
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if (pr->request) {
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ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
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"http postpone filter wake \"%V?%V\"",
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&pr->request->uri, &pr->request->args);
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r->postponed = pr->next;
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c->data = pr->request;
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return ngx_http_post_request(pr->request, NULL);
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}
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if (pr->out == NULL) {
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ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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"http postpone filter NULL output");
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} else {
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ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
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"http postpone filter output \"%V?%V\"",
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&r->uri, &r->args);
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if (ngx_http_next_body_filter(r->main, pr->out) == NGX_ERROR) {
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return NGX_ERROR;
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}
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}
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r->postponed = pr->next;
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} while (r->postponed);
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return NGX_OK;
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}
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static ngx_int_t
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ngx_http_postpone_filter_add(ngx_http_request_t *r, ngx_chain_t *in)
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{
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ngx_http_postponed_request_t *pr, **ppr;
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if (r->postponed) {
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for (pr = r->postponed; pr->next; pr = pr->next) { /* void */ }
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if (pr->request == NULL) {
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goto found;
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}
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ppr = &pr->next;
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} else {
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ppr = &r->postponed;
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}
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pr = ngx_palloc(r->pool, sizeof(ngx_http_postponed_request_t));
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if (pr == NULL) {
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return NGX_ERROR;
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}
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*ppr = pr;
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pr->request = NULL;
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pr->out = NULL;
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pr->next = NULL;
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found:
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if (ngx_chain_add_copy(r->pool, &pr->out, in) == NGX_OK) {
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return NGX_OK;
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}
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return NGX_ERROR;
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}
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static ngx_int_t
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ngx_http_postpone_filter_in_memory(ngx_http_request_t *r, ngx_chain_t *in)
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{
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size_t len;
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ngx_buf_t *b;
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ngx_connection_t *c;
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ngx_http_core_loc_conf_t *clcf;
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c = r->connection;
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ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
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"http postpone filter in memory");
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if (r->out == NULL) {
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clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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if (r->headers_out.content_length_n != -1) {
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len = r->headers_out.content_length_n;
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if (len > clcf->subrequest_output_buffer_size) {
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ngx_log_error(NGX_LOG_ERR, c->log, 0,
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"too big subrequest response: %uz", len);
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return NGX_ERROR;
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}
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} else {
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len = clcf->subrequest_output_buffer_size;
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}
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b = ngx_create_temp_buf(r->pool, len);
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if (b == NULL) {
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return NGX_ERROR;
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}
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b->last_buf = 1;
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r->out = ngx_alloc_chain_link(r->pool);
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if (r->out == NULL) {
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return NGX_ERROR;
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}
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r->out->buf = b;
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r->out->next = NULL;
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}
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b = r->out->buf;
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for ( /* void */ ; in; in = in->next) {
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if (ngx_buf_special(in->buf)) {
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continue;
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}
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len = in->buf->last - in->buf->pos;
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if (len > (size_t) (b->end - b->last)) {
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ngx_log_error(NGX_LOG_ERR, c->log, 0,
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"too big subrequest response");
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return NGX_ERROR;
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}
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ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
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"http postpone filter in memory %uz bytes", len);
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b->last = ngx_cpymem(b->last, in->buf->pos, len);
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in->buf->pos = in->buf->last;
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}
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return NGX_OK;
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}
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static ngx_int_t
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ngx_http_postpone_filter_init(ngx_conf_t *cf)
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{
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ngx_http_next_body_filter = ngx_http_top_body_filter;
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ngx_http_top_body_filter = ngx_http_postpone_filter;
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return NGX_OK;
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}
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