diff options
Diffstat (limited to 'app/nginx/src/http/ngx_http_write_filter_module.c')
-rw-r--r-- | app/nginx/src/http/ngx_http_write_filter_module.c | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/app/nginx/src/http/ngx_http_write_filter_module.c b/app/nginx/src/http/ngx_http_write_filter_module.c new file mode 100644 index 0000000..0036231 --- /dev/null +++ b/app/nginx/src/http/ngx_http_write_filter_module.c @@ -0,0 +1,327 @@ + +/* + * 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; +} |