| // Copyright 2015 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: morlovich@google.com (Maksim Orlovich) |
| // (Based on apache_fetch.h) |
| |
| #ifndef PAGESPEED_SIMPLE_BUFFERED_APACHE_FETCH_H_ |
| #define PAGESPEED_SIMPLE_BUFFERED_APACHE_FETCH_H_ |
| |
| #include <memory> |
| #include <queue> |
| #include <utility> |
| |
| #include "net/instaweb/http/public/async_fetch.h" |
| #include "net/instaweb/http/public/request_context.h" |
| #include "pagespeed/apache/apache_writer.h" |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/condvar.h" |
| #include "pagespeed/kernel/base/message_handler.h" |
| #include "pagespeed/kernel/base/string.h" |
| #include "pagespeed/kernel/base/string_util.h" |
| #include "pagespeed/kernel/base/thread_annotations.h" |
| #include "pagespeed/kernel/base/thread_system.h" |
| #include "pagespeed/kernel/http/request_headers.h" |
| #include "pagespeed/kernel/http/response_headers.h" |
| |
| struct request_rec; |
| |
| namespace net_instaweb { |
| |
| // Links an apache request_rec* to an AsyncFetch, adding the ability to |
| // block based on a condition variable. Unlike ApacheFetch this always |
| // buffers and implements no policy, nor does it try to use Apache thread |
| // for any rewriting --- a scheduler thread should be used along with this. |
| class SimpleBufferedApacheFetch : public AsyncFetch { |
| public: |
| // Takes ownership of request_headers. req is expected to survive at least |
| // until Wait() returns. |
| SimpleBufferedApacheFetch( |
| const RequestContextPtr& request_context, |
| RequestHeaders* request_headers, |
| ThreadSystem* thread_system, |
| request_rec* req, |
| MessageHandler* handler); |
| ~SimpleBufferedApacheFetch() override; |
| |
| // Blocks waiting for the fetch to complete. |
| void Wait() LOCKS_EXCLUDED(mutex_); |
| |
| bool IsCachedResultValid(const ResponseHeaders& headers) override |
| LOCKS_EXCLUDED(mutex_); |
| |
| protected: |
| void HandleHeadersComplete() override LOCKS_EXCLUDED(mutex_); |
| void HandleDone(bool success) override LOCKS_EXCLUDED(mutex_); |
| bool HandleFlush(MessageHandler* handler) override LOCKS_EXCLUDED(mutex_); |
| bool HandleWrite(const StringPiece& sp, MessageHandler* handler) override |
| LOCKS_EXCLUDED(mutex_); |
| |
| private: |
| enum Op { |
| kOpHeadersComplete, |
| kOpWrite, |
| kOpFlush, |
| kOpDone |
| }; |
| |
| typedef std::pair<Op, GoogleString> OpInfo; |
| |
| // Blocks until there is an operation in the queue, and move it to *out. |
| void WaitForOp(OpInfo* out) LOCKS_EXCLUDED(mutex_); |
| |
| void SendOutHeaders(); |
| |
| std::unique_ptr<ApacheWriter> apache_writer_; |
| MessageHandler* message_handler_; |
| |
| std::unique_ptr<ThreadSystem::CondvarCapableMutex> mutex_; |
| std::unique_ptr<ThreadSystem::Condvar> notify_; |
| std::queue<OpInfo> queue_; |
| |
| bool wait_called_ GUARDED_BY(mutex_); |
| |
| DISALLOW_COPY_AND_ASSIGN(SimpleBufferedApacheFetch); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // PAGESPEED_SIMPLE_BUFFERED_APACHE_FETCH_H_ |