| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // Author: jmarantz@google.com (Joshua Marantz) |
| |
| #ifndef NET_INSTAWEB_REWRITER_PUBLIC_DEBUG_FILTER_H_ |
| #define NET_INSTAWEB_REWRITER_PUBLIC_DEBUG_FILTER_H_ |
| |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/string.h" |
| #include "pagespeed/kernel/base/string_util.h" |
| #include "pagespeed/kernel/html/empty_html_filter.h" |
| |
| namespace net_instaweb { |
| |
| class HtmlElement; |
| class RewriteDriver; |
| class Timer; |
| |
| // Injects HTML comments for measuring the time it takes to parse HTML, |
| // run the Flush/Render sequence, and the idle-time between text blocks. |
| // Data is written into the HTML as comments. |
| class DebugFilter : public EmptyHtmlFilter { |
| public: |
| explicit DebugFilter(RewriteDriver* driver); |
| virtual ~DebugFilter(); |
| |
| virtual void EndDocument(); |
| virtual void Flush(); |
| |
| virtual const char* Name() const { return "Debug"; } |
| |
| // Special entry-points needed for measuring timing. The timing |
| // of StartDocument/EndDocument does not capture the correct timing, |
| // and changing them so they do would alter functionality depended |
| // upon by numerous filters. So we have special entry-points for |
| // this filter called directly by RewriteDriver. This can be generalized |
| // in the future if these entry-points prove useful. |
| void InitParse(); |
| void StartParse(); |
| void EndParse(); |
| void StartRender(); |
| void EndRender(); |
| |
| virtual void EndElement(HtmlElement* element); |
| |
| // Formats Flush/EndOfDocument messages that will be easy to read from |
| // View->PageSource in a browser. |
| // |
| // They are exposed for testing, so that unit tests are not concerned with |
| // the exact formatting of those messages. |
| static GoogleString FormatFlushMessage(int64 time_since_init_parse_us, |
| int64 parse_duration_us, |
| int64 flush_duration_us, |
| int64 idle_duration_us); |
| static GoogleString FormatEndDocumentMessage( |
| int64 time_since_init_parse_us, int64 total_parse_duration_us, |
| int64 total_flush_duration_us, int64 total_idle_duration_us, |
| int num_flushes, bool is_critical_images_beacon_enabled, |
| const StringSet& critical_image_urls, |
| const StringVector& dynamically_disabled_filter_list); |
| // Gets the list of active filters from the RewriteDriver for logging to debug |
| // message. |
| GoogleString ListActiveFiltersAndOptions() const; |
| |
| private: |
| // Tracks duration of events of interest that may occur multiple times |
| // during an HTML rewrite. |
| class Event { |
| public: |
| Event(); |
| inline void Clear(); |
| inline void Start(int64 now_us); |
| inline void End(int64 now_us); |
| inline void AddToTotal(); |
| |
| int64 start_us() const { return start_us_; } |
| int64 duration_us() const { return duration_us_; } |
| int64 total_us() const { return total_us_; } |
| |
| private: |
| int64 start_us_; |
| int64 duration_us_; |
| int64 total_us_; |
| }; |
| |
| void Clear(); |
| |
| RewriteDriver* driver_; |
| Timer* timer_; |
| bool end_document_seen_; // Set at EndOfDocument, checked at Flush. |
| int num_flushes_; |
| int64 start_doc_time_us_; // Established at InitParse. |
| Event parse_; // Tracks how much time is spent parsing. |
| Event render_; // Tracks how much time is spent rendering. |
| Event idle_; // Tracks how much time is spent waiting. |
| StringSet critical_image_urls_; |
| |
| // The buffered flush messages this filter generates for a flush in a literal |
| // tag. |
| GoogleString flush_messages_; |
| |
| StringVector dynamically_disabled_filter_list_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DebugFilter); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // NET_INSTAWEB_REWRITER_PUBLIC_DEBUG_FILTER_H_ |