diff options
Diffstat (limited to 'app/nginx/src/http/ngx_http_postpone_filter_module.c')
| -rw-r--r-- | app/nginx/src/http/ngx_http_postpone_filter_module.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/app/nginx/src/http/ngx_http_postpone_filter_module.c b/app/nginx/src/http/ngx_http_postpone_filter_module.c new file mode 100644 index 0000000..e893b83 --- /dev/null +++ b/app/nginx/src/http/ngx_http_postpone_filter_module.c @@ -0,0 +1,176 @@ + +/* + * 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_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 != c->data) { + + if (in) { + ngx_http_postpone_filter_add(r, in); + 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) { + ngx_http_postpone_filter_add(r, in); + } + + 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_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; +} |