| |
| /* |
| * 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_write_filter_init(ngx_conf_t *cf); |
| |
| |
| static ngx_http_module_t ngx_http_write_filter_module_ctx = { |
| NULL, /* preconfiguration */ |
| ngx_http_write_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_write_filter_module = { |
| NGX_MODULE_V1, |
| &ngx_http_write_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 |
| }; |
| |
| |
| ngx_int_t |
| ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in) |
| { |
| off_t size, sent, nsent, limit; |
| ngx_uint_t last, flush, sync; |
| ngx_msec_t delay; |
| ngx_chain_t *cl, *ln, **ll, *chain; |
| ngx_connection_t *c; |
| ngx_http_core_loc_conf_t *clcf; |
| |
| c = r->connection; |
| |
| if (c->error) { |
| return NGX_ERROR; |
| } |
| |
| size = 0; |
| flush = 0; |
| sync = 0; |
| last = 0; |
| ll = &r->out; |
| |
| /* find the size, the flush point and the last link of the saved chain */ |
| |
| for (cl = r->out; cl; cl = cl->next) { |
| ll = &cl->next; |
| |
| ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0, |
| "write old buf t:%d f:%d %p, pos %p, size: %z " |
| "file: %O, size: %O", |
| cl->buf->temporary, cl->buf->in_file, |
| cl->buf->start, cl->buf->pos, |
| cl->buf->last - cl->buf->pos, |
| cl->buf->file_pos, |
| cl->buf->file_last - cl->buf->file_pos); |
| |
| #if 1 |
| if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) { |
| ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
| "zero size buf in writer " |
| "t:%d r:%d f:%d %p %p-%p %p %O-%O", |
| cl->buf->temporary, |
| cl->buf->recycled, |
| cl->buf->in_file, |
| cl->buf->start, |
| cl->buf->pos, |
| cl->buf->last, |
| cl->buf->file, |
| cl->buf->file_pos, |
| cl->buf->file_last); |
| |
| ngx_debug_point(); |
| return NGX_ERROR; |
| } |
| #endif |
| |
| size += ngx_buf_size(cl->buf); |
| |
| if (cl->buf->flush || cl->buf->recycled) { |
| flush = 1; |
| } |
| |
| if (cl->buf->sync) { |
| sync = 1; |
| } |
| |
| if (cl->buf->last_buf) { |
| last = 1; |
| } |
| } |
| |
| /* add the new chain to the existent one */ |
| |
| for (ln = in; ln; ln = ln->next) { |
| cl = ngx_alloc_chain_link(r->pool); |
| if (cl == NULL) { |
| return NGX_ERROR; |
| } |
| |
| cl->buf = ln->buf; |
| *ll = cl; |
| ll = &cl->next; |
| |
| ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0, |
| "write new buf t:%d f:%d %p, pos %p, size: %z " |
| "file: %O, size: %O", |
| cl->buf->temporary, cl->buf->in_file, |
| cl->buf->start, cl->buf->pos, |
| cl->buf->last - cl->buf->pos, |
| cl->buf->file_pos, |
| cl->buf->file_last - cl->buf->file_pos); |
| |
| #if 1 |
| if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) { |
| ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
| "zero size buf in writer " |
| "t:%d r:%d f:%d %p %p-%p %p %O-%O", |
| cl->buf->temporary, |
| cl->buf->recycled, |
| cl->buf->in_file, |
| cl->buf->start, |
| cl->buf->pos, |
| cl->buf->last, |
| cl->buf->file, |
| cl->buf->file_pos, |
| cl->buf->file_last); |
| |
| ngx_debug_point(); |
| return NGX_ERROR; |
| } |
| #endif |
| |
| size += ngx_buf_size(cl->buf); |
| |
| if (cl->buf->flush || cl->buf->recycled) { |
| flush = 1; |
| } |
| |
| if (cl->buf->sync) { |
| sync = 1; |
| } |
| |
| if (cl->buf->last_buf) { |
| last = 1; |
| } |
| } |
| |
| *ll = NULL; |
| |
| ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0, |
| "http write filter: l:%ui f:%ui s:%O", last, flush, size); |
| |
| clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); |
| |
| /* |
| * avoid the output if there are no last buf, no flush point, |
| * there are the incoming bufs and the size of all bufs |
| * is smaller than "postpone_output" directive |
| */ |
| |
| if (!last && !flush && in && size < (off_t) clcf->postpone_output) { |
| return NGX_OK; |
| } |
| |
| if (c->write->delayed) { |
| c->buffered |= NGX_HTTP_WRITE_BUFFERED; |
| return NGX_AGAIN; |
| } |
| |
| if (size == 0 |
| && !(c->buffered & NGX_LOWLEVEL_BUFFERED) |
| && !(last && c->need_last_buf)) |
| { |
| if (last || flush || sync) { |
| for (cl = r->out; cl; /* void */) { |
| ln = cl; |
| cl = cl->next; |
| ngx_free_chain(r->pool, ln); |
| } |
| |
| r->out = NULL; |
| c->buffered &= ~NGX_HTTP_WRITE_BUFFERED; |
| |
| return NGX_OK; |
| } |
| |
| ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
| "the http output chain is empty"); |
| |
| ngx_debug_point(); |
| |
| return NGX_ERROR; |
| } |
| |
| if (r->limit_rate) { |
| if (r->limit_rate_after == 0) { |
| r->limit_rate_after = clcf->limit_rate_after; |
| } |
| |
| limit = (off_t) r->limit_rate * (ngx_time() - r->start_sec + 1) |
| - (c->sent - r->limit_rate_after); |
| |
| if (limit <= 0) { |
| c->write->delayed = 1; |
| delay = (ngx_msec_t) (- limit * 1000 / r->limit_rate + 1); |
| ngx_add_timer(c->write, delay); |
| |
| c->buffered |= NGX_HTTP_WRITE_BUFFERED; |
| |
| return NGX_AGAIN; |
| } |
| |
| if (clcf->sendfile_max_chunk |
| && (off_t) clcf->sendfile_max_chunk < limit) |
| { |
| limit = clcf->sendfile_max_chunk; |
| } |
| |
| } else { |
| limit = clcf->sendfile_max_chunk; |
| } |
| |
| sent = c->sent; |
| |
| ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, |
| "http write filter limit %O", limit); |
| |
| chain = c->send_chain(c, r->out, limit); |
| |
| ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, |
| "http write filter %p", chain); |
| |
| if (chain == NGX_CHAIN_ERROR) { |
| c->error = 1; |
| return NGX_ERROR; |
| } |
| |
| if (r->limit_rate) { |
| |
| nsent = c->sent; |
| |
| if (r->limit_rate_after) { |
| |
| sent -= r->limit_rate_after; |
| if (sent < 0) { |
| sent = 0; |
| } |
| |
| nsent -= r->limit_rate_after; |
| if (nsent < 0) { |
| nsent = 0; |
| } |
| } |
| |
| delay = (ngx_msec_t) ((nsent - sent) * 1000 / r->limit_rate); |
| |
| if (delay > 0) { |
| limit = 0; |
| c->write->delayed = 1; |
| ngx_add_timer(c->write, delay); |
| } |
| } |
| |
| if (limit |
| && c->write->ready |
| && c->sent - sent >= limit - (off_t) (2 * ngx_pagesize)) |
| { |
| c->write->delayed = 1; |
| ngx_add_timer(c->write, 1); |
| } |
| |
| for (cl = r->out; cl && cl != chain; /* void */) { |
| ln = cl; |
| cl = cl->next; |
| ngx_free_chain(r->pool, ln); |
| } |
| |
| r->out = chain; |
| |
| if (chain) { |
| c->buffered |= NGX_HTTP_WRITE_BUFFERED; |
| return NGX_AGAIN; |
| } |
| |
| c->buffered &= ~NGX_HTTP_WRITE_BUFFERED; |
| |
| if ((c->buffered & NGX_LOWLEVEL_BUFFERED) && r->postponed == NULL) { |
| return NGX_AGAIN; |
| } |
| |
| return NGX_OK; |
| } |
| |
| |
| static ngx_int_t |
| ngx_http_write_filter_init(ngx_conf_t *cf) |
| { |
| ngx_http_top_body_filter = ngx_http_write_filter; |
| |
| return NGX_OK; |
| } |