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00010 #ifndef __PION_HTTPWRITER_HEADER__
00011 #define __PION_HTTPWRITER_HEADER__
00012
00013 #include <vector>
00014 #include <string>
00015 #include <exception>
00016 #include <boost/shared_ptr.hpp>
00017 #include <boost/function.hpp>
00018 #include <boost/function/function0.hpp>
00019 #include <boost/function/function2.hpp>
00020 #include <boost/asio.hpp>
00021 #include <boost/noncopyable.hpp>
00022 #include <pion/PionConfig.hpp>
00023 #include <pion/PionLogger.hpp>
00024 #include <pion/net/HTTPMessage.hpp>
00025 #include <pion/net/TCPConnection.hpp>
00026
00027
00028 namespace pion {
00029 namespace net {
00030
00034 class PION_NET_API HTTPWriter :
00035 private boost::noncopyable
00036 {
00037 protected:
00038
00040 typedef boost::function0<void> FinishedHandler;
00041
00043 typedef boost::function2<void,const boost::system::error_code&,std::size_t> WriteHandler;
00044
00045
00052 HTTPWriter(TCPConnectionPtr& tcp_conn, FinishedHandler handler)
00053 : m_logger(PION_GET_LOGGER("pion.net.HTTPWriter")),
00054 m_tcp_conn(tcp_conn), m_content_length(0), m_stream_is_empty(true),
00055 m_client_supports_chunks(true), m_sending_chunks(false),
00056 m_sent_headers(false), m_finished(handler)
00057 {}
00058
00065 virtual void handleWrite(const boost::system::error_code& write_error,
00066 std::size_t bytes_written) = 0;
00067
00068
00074 virtual void prepareBuffersForSend(HTTPMessage::WriteBuffers& write_buffers) = 0;
00075
00077 virtual WriteHandler bindToWriteHandler(void) = 0;
00078
00080 inline void finishedWriting(void) { if (m_finished) m_finished(); }
00081
00082
00083 public:
00084
00086 class LostConnectionException : public std::exception {
00087 public:
00088 virtual const char* what() const throw() {
00089 return "Lost TCP connection while or before sending an HTTP message";
00090 }
00091 };
00092
00094 virtual ~HTTPWriter() {}
00095
00097 inline void clear(void) {
00098 m_content_buffers.clear();
00099 m_binary_cache.clear();
00100 m_text_cache.clear();
00101 m_content_stream.str("");
00102 m_stream_is_empty = true;
00103 m_content_length = 0;
00104 }
00105
00111 template <typename T>
00112 inline void write(const T& data) {
00113 m_content_stream << data;
00114 if (m_stream_is_empty) m_stream_is_empty = false;
00115 }
00116
00123 inline void write(const void *data, size_t length) {
00124 if (length != 0) {
00125 flushContentStream();
00126 m_content_buffers.push_back(m_binary_cache.add(data, length));
00127 m_content_length += length;
00128 }
00129 }
00130
00138 inline void writeNoCopy(const std::string& data) {
00139 if (! data.empty()) {
00140 flushContentStream();
00141 m_content_buffers.push_back(boost::asio::buffer(data));
00142 m_content_length += data.size();
00143 }
00144 }
00145
00153 inline void writeNoCopy(void *data, size_t length) {
00154 if (length > 0) {
00155 flushContentStream();
00156 m_content_buffers.push_back(boost::asio::buffer(data, length));
00157 m_content_length += length;
00158 }
00159 }
00160
00161
00167 inline void send(void) {
00168 sendMoreData(false, bindToWriteHandler());
00169 }
00170
00180 template <typename SendHandler>
00181 inline void send(SendHandler send_handler) {
00182 sendMoreData(false, send_handler);
00183 }
00184
00195 template <typename SendHandler>
00196 inline void sendChunk(SendHandler send_handler) {
00197 m_sending_chunks = true;
00198 if (!supportsChunkedMessages()) {
00199
00200
00201 m_tcp_conn->setLifecycle(TCPConnection::LIFECYCLE_CLOSE);
00202 }
00203
00204 sendMoreData(false, send_handler);
00205 }
00206
00218 template <typename SendHandler>
00219 inline void sendFinalChunk(SendHandler send_handler) {
00220 m_sending_chunks = true;
00221 sendMoreData(true, send_handler);
00222 }
00223
00231 inline void sendFinalChunk(void) {
00232 m_sending_chunks = true;
00233 sendMoreData(true, bindToWriteHandler());
00234 }
00235
00236
00238 inline TCPConnectionPtr& getTCPConnection(void) { return m_tcp_conn; }
00239
00241 inline size_t getContentLength(void) const { return m_content_length; }
00242
00244 inline void supportsChunkedMessages(bool b) { m_client_supports_chunks = b; }
00245
00247 inline bool supportsChunkedMessages() const { return m_client_supports_chunks; }
00248
00250 inline bool sendingChunkedMessage() const { return m_sending_chunks; }
00251
00253 inline void setLogger(PionLogger log_ptr) { m_logger = log_ptr; }
00254
00256 inline PionLogger getLogger(void) { return m_logger; }
00257
00258
00259 private:
00260
00267 template <typename SendHandler>
00268 inline void sendMoreData(const bool send_final_chunk, SendHandler send_handler)
00269 {
00270
00271 if (! m_tcp_conn->is_open()) throw LostConnectionException();
00272
00273 flushContentStream();
00274
00275 HTTPMessage::WriteBuffers write_buffers;
00276 prepareWriteBuffers(write_buffers, send_final_chunk);
00277
00278 m_tcp_conn->async_write(write_buffers, send_handler);
00279 }
00280
00287 void prepareWriteBuffers(HTTPMessage::WriteBuffers &write_buffers,
00288 const bool send_final_chunk);
00289
00291 inline void flushContentStream(void) {
00292 if (! m_stream_is_empty) {
00293 std::string string_to_add(m_content_stream.str());
00294 if (! string_to_add.empty()) {
00295 m_content_stream.str("");
00296 m_content_length += string_to_add.size();
00297 m_text_cache.push_back(string_to_add);
00298 m_content_buffers.push_back(boost::asio::buffer(m_text_cache.back()));
00299 }
00300 m_stream_is_empty = true;
00301 }
00302 }
00303
00304
00306 class BinaryCache : public std::vector<std::pair<const char *, size_t> > {
00307 public:
00308 ~BinaryCache() {
00309 for (iterator i=begin(); i!=end(); ++i) {
00310 delete[] i->first;
00311 }
00312 }
00313 inline boost::asio::const_buffer add(const void *ptr, const size_t size) {
00314 char *data_ptr = new char[size];
00315 memcpy(data_ptr, ptr, size);
00316 push_back( std::make_pair(data_ptr, size) );
00317 return boost::asio::buffer(data_ptr, size);
00318 }
00319 };
00320
00322 typedef std::list<std::string> TextCache;
00323
00324
00326 PionLogger m_logger;
00327
00329 TCPConnectionPtr m_tcp_conn;
00330
00332 HTTPMessage::WriteBuffers m_content_buffers;
00333
00335 BinaryCache m_binary_cache;
00336
00338 TextCache m_text_cache;
00339
00341 std::ostringstream m_content_stream;
00342
00344 size_t m_content_length;
00345
00347 bool m_stream_is_empty;
00348
00350 bool m_client_supports_chunks;
00351
00353 bool m_sending_chunks;
00354
00356 bool m_sent_headers;
00357
00359 FinishedHandler m_finished;
00360 };
00361
00362
00364 typedef boost::shared_ptr<HTTPWriter> HTTPWriterPtr;
00365
00366
00368 template <typename T>
00369 HTTPWriterPtr& operator<<(HTTPWriterPtr& writer, const T& data) {
00370 writer->write(data);
00371 return writer;
00372 }
00373
00374
00375 }
00376 }
00377
00378 #endif