| /** |
| * Copyright 2010 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: sligocki@google.com (Shawn Ligocki) |
| |
| #include "net/instaweb/util/public/http_dump_url_async_writer.h" |
| |
| #include "net/instaweb/util/public/file_writer.h" |
| #include "net/instaweb/util/public/google_url.h" |
| #include "net/instaweb/util/public/message_handler.h" |
| #include "net/instaweb/util/public/meta_data.h" |
| #include "net/instaweb/util/public/simple_meta_data.h" |
| #include "net/instaweb/util/public/string_writer.h" |
| |
| namespace net_instaweb { |
| |
| class HttpDumpUrlAsyncWriter::Fetch : UrlAsyncFetcher::Callback { |
| public: |
| Fetch(const std::string& url, const MetaData& request_headers, |
| MetaData* response_headers, Writer* response_writer, |
| MessageHandler* handler, Callback* callback, |
| const std::string& filename, UrlFetcher* dump_fetcher, |
| FileSystem* file_system) |
| : url_(url), response_headers_(response_headers), |
| response_writer_(response_writer), handler_(handler), |
| callback_(callback), filename_(filename), dump_fetcher_(dump_fetcher), |
| file_system_(file_system), string_writer_(&contents_) { |
| request_headers_.CopyFrom(request_headers); |
| } |
| |
| // Like UrlAsyncFetcher::StreamingFetch, returns true if callback has been |
| // called already. |
| bool StartFetch(const bool accept_gzip, UrlAsyncFetcher* base_fetcher) { |
| // In general we will want to always ask the origin for gzipped output, |
| // but we are leaving in variable so this could be overridden by the |
| // instantiator of the DumpUrlWriter. |
| compress_headers_.CopyFrom(request_headers_); |
| if (accept_gzip) { |
| compress_headers_.RemoveAll(HttpAttributes::kAcceptEncoding); |
| compress_headers_.Add(HttpAttributes::kAcceptEncoding, |
| HttpAttributes::kGzip); |
| } |
| |
| return base_fetcher->StreamingFetch(url_, compress_headers_, |
| &compressed_response_, &string_writer_, |
| handler_, this); |
| } |
| |
| // Finishes the Fetch when called back. |
| void Done(bool success) { |
| compressed_response_.RemoveAll(HttpAttributes::kContentLength); |
| compressed_response_.Add(HttpAttributes::kContentLength, |
| IntegerToString(contents_.size()).c_str()); |
| compressed_response_.ComputeCaching(); |
| |
| // Do not write an empty file if the fetch failed. |
| if (success) { |
| FileSystem::OutputFile* file = file_system_->OpenTempFile( |
| filename_ + ".temp", handler_); |
| if (file != NULL) { |
| handler_->Message(kInfo, "Storing %s as %s", url_.c_str(), |
| filename_.c_str()); |
| std::string temp_filename = file->filename(); |
| FileWriter file_writer(file); |
| success = compressed_response_.Write(&file_writer, handler_) && |
| file->Write(contents_, handler_); |
| success &= file_system_->Close(file, handler_); |
| success &= file_system_->RenameFile(temp_filename.c_str(), |
| filename_.c_str(), |
| handler_); |
| } else { |
| success = false; |
| } |
| } |
| |
| // We are not going to be able to read the response from the file |
| // system so we better pass the error message through. |
| if (!success) { |
| response_headers_->CopyFrom(compressed_response_); |
| response_writer_->Write(contents_, handler_); |
| } else { |
| // Let dump fetcher fetch the actual response so that it can decompress. |
| success = dump_fetcher_->StreamingFetchUrl( |
| url_, request_headers_, response_headers_, response_writer_, |
| handler_); |
| } |
| |
| callback_->Done(success); |
| delete this; |
| } |
| |
| private: |
| const std::string url_; |
| SimpleMetaData request_headers_; |
| MetaData* response_headers_; |
| Writer* response_writer_; |
| MessageHandler* handler_; |
| Callback* callback_; |
| |
| const std::string filename_; |
| UrlFetcher* dump_fetcher_; |
| FileSystem* file_system_; |
| |
| std::string contents_; |
| StringWriter string_writer_; |
| SimpleMetaData compress_headers_; |
| SimpleMetaData compressed_response_; |
| |
| DISALLOW_COPY_AND_ASSIGN(Fetch); |
| }; |
| |
| HttpDumpUrlAsyncWriter::~HttpDumpUrlAsyncWriter() { |
| } |
| |
| bool HttpDumpUrlAsyncWriter::StreamingFetch(const std::string& url, |
| const MetaData& request_headers, |
| MetaData* response_headers, |
| Writer* response_writer, |
| MessageHandler* handler, |
| Callback* callback) { |
| std::string filename; |
| dump_fetcher_.GetFilename(GURL(url), &filename, handler); |
| |
| if (file_system_->Exists(filename.c_str(), handler).is_true()) { |
| bool success = dump_fetcher_.StreamingFetchUrl( |
| url, request_headers, response_headers, response_writer, handler); |
| callback->Done(success); |
| return true; |
| } else { |
| Fetch* fetch = new Fetch(url, request_headers, response_headers, |
| response_writer, handler, callback, filename, |
| &dump_fetcher_, file_system_); |
| return fetch->StartFetch(accept_gzip_, base_fetcher_); |
| } |
| } |
| |
| } // namespace net_instaweb |