Mercurial > hg > nginx
diff src/http/ngx_http_core_module.c @ 7006:9552758a786e
Background subrequests for cache updates.
Previously, cache background update might not work as expected, making client
wait for it to complete before receiving the final part of a stale response.
This could happen if the response could not be sent to the client socket in one
filter chain call.
Now background cache update is done in a background subrequest. This type of
subrequest does not block any other subrequests or the main request.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Thu, 25 May 2017 15:57:59 +0300 |
parents | 0cdee26605f3 |
children | 6d0e0d982ec0 |
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--- a/src/http/ngx_http_core_module.c +++ b/src/http/ngx_http_core_module.c @@ -2518,6 +2518,7 @@ ngx_http_subrequest(ngx_http_request_t * sr->subrequest_in_memory = (flags & NGX_HTTP_SUBREQUEST_IN_MEMORY) != 0; sr->waited = (flags & NGX_HTTP_SUBREQUEST_WAITED) != 0; + sr->background = (flags & NGX_HTTP_SUBREQUEST_BACKGROUND) != 0; sr->unparsed_uri = r->unparsed_uri; sr->method_name = ngx_http_core_get_method; @@ -2531,29 +2532,31 @@ ngx_http_subrequest(ngx_http_request_t * sr->read_event_handler = ngx_http_request_empty_handler; sr->write_event_handler = ngx_http_handler; - if (c->data == r && r->postponed == NULL) { - c->data = sr; - } - sr->variables = r->variables; sr->log_handler = r->log_handler; - pr = ngx_palloc(r->pool, sizeof(ngx_http_postponed_request_t)); - if (pr == NULL) { - return NGX_ERROR; - } - - pr->request = sr; - pr->out = NULL; - pr->next = NULL; - - if (r->postponed) { - for (p = r->postponed; p->next; p = p->next) { /* void */ } - p->next = pr; - - } else { - r->postponed = pr; + if (!sr->background) { + if (c->data == r && r->postponed == NULL) { + c->data = sr; + } + + pr = ngx_palloc(r->pool, sizeof(ngx_http_postponed_request_t)); + if (pr == NULL) { + return NGX_ERROR; + } + + pr->request = sr; + pr->out = NULL; + pr->next = NULL; + + if (r->postponed) { + for (p = r->postponed; p->next; p = p->next) { /* void */ } + p->next = pr; + + } else { + r->postponed = pr; + } } sr->internal = 1;