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-rw-r--r--app/nginx/src/http/ngx_http_write_filter_module.c327
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;
+}