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Diffstat (limited to 'websocketpp/transport/debug/connection.hpp')
| -rw-r--r-- | websocketpp/transport/debug/connection.hpp | 412 |
1 files changed, 412 insertions, 0 deletions
diff --git a/websocketpp/transport/debug/connection.hpp b/websocketpp/transport/debug/connection.hpp new file mode 100644 index 00000000..36b282a2 --- /dev/null +++ b/websocketpp/transport/debug/connection.hpp @@ -0,0 +1,412 @@ +/* + * Copyright (c) 2014, Peter Thorson. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * * Neither the name of the WebSocket++ Project nor the + * names of its contributors may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#ifndef WEBSOCKETPP_TRANSPORT_DEBUG_CON_HPP +#define WEBSOCKETPP_TRANSPORT_DEBUG_CON_HPP + +#include <websocketpp/transport/debug/base.hpp> + +#include <websocketpp/transport/base/connection.hpp> + +#include <websocketpp/uri.hpp> +#include <websocketpp/logger/levels.hpp> + +#include <websocketpp/common/connection_hdl.hpp> +#include <websocketpp/common/memory.hpp> +#include <websocketpp/common/platforms.hpp> + +#include <string> +#include <vector> + +namespace websocketpp { +namespace transport { +namespace debug { + +/// Empty timer class to stub out for timer functionality that stub +/// transport doesn't support +struct timer { + void cancel() {} +}; + +template <typename config> +class connection : public lib::enable_shared_from_this< connection<config> > { +public: + /// Type of this connection transport component + typedef connection<config> type; + /// Type of a shared pointer to this connection transport component + typedef lib::shared_ptr<type> ptr; + + /// transport concurrency policy + typedef typename config::concurrency_type concurrency_type; + /// Type of this transport's access logging policy + typedef typename config::alog_type alog_type; + /// Type of this transport's error logging policy + typedef typename config::elog_type elog_type; + + // Concurrency policy types + typedef typename concurrency_type::scoped_lock_type scoped_lock_type; + typedef typename concurrency_type::mutex_type mutex_type; + + typedef lib::shared_ptr<timer> timer_ptr; + + explicit connection(bool is_server, alog_type & alog, elog_type & elog) + : m_reading(false), m_is_server(is_server), m_alog(alog), m_elog(elog) + { + m_alog.write(log::alevel::devel,"debug con transport constructor"); + } + + /// Get a shared pointer to this component + ptr get_shared() { + return type::shared_from_this(); + } + + /// Set whether or not this connection is secure + /** + * Todo: docs + * + * @since 0.3.0-alpha4 + * + * @param value Whether or not this connection is secure. + */ + void set_secure(bool) {} + + /// Tests whether or not the underlying transport is secure + /** + * TODO: docs + * + * @return Whether or not the underlying transport is secure + */ + bool is_secure() const { + return false; + } + + /// Set uri hook + /** + * Called by the endpoint as a connection is being established to provide + * the uri being connected to to the transport layer. + * + * Implementation is optional and can be ignored if the transport has no + * need for this information. + * + * @since 0.6.0 + * + * @param u The uri to set + */ + void set_uri(uri_ptr) {} + + /// Set human readable remote endpoint address + /** + * Sets the remote endpoint address returned by `get_remote_endpoint`. This + * value should be a human readable string that describes the remote + * endpoint. Typically an IP address or hostname, perhaps with a port. But + * may be something else depending on the nature of the underlying + * transport. + * + * If none is set a default is returned. + * + * @since 0.3.0-alpha4 + * + * @param value The remote endpoint address to set. + */ + void set_remote_endpoint(std::string) {} + + /// Get human readable remote endpoint address + /** + * TODO: docs + * + * This value is used in access and error logs and is available to the end + * application for including in user facing interfaces and messages. + * + * @return A string identifying the address of the remote endpoint + */ + std::string get_remote_endpoint() const { + return "unknown (debug transport)"; + } + + /// Get the connection handle + /** + * @return The handle for this connection. + */ + connection_hdl get_handle() const { + return connection_hdl(); + } + + /// Call back a function after a period of time. + /** + * Timers are not implemented in this transport. The timer pointer will + * always be empty. The handler will never be called. + * + * @param duration Length of time to wait in milliseconds + * @param callback The function to call back when the timer has expired + * @return A handle that can be used to cancel the timer if it is no longer + * needed. + */ + timer_ptr set_timer(long, timer_handler handler) { + m_alog.write(log::alevel::devel,"debug connection set timer"); + m_timer_handler = handler; + return timer_ptr(); + } + + /// Manual input supply (read all) + /** + * Similar to read_some, but continues to read until all bytes in the + * supplied buffer have been read or the connection runs out of read + * requests. + * + * This method still may not read all of the bytes in the input buffer. if + * it doesn't it indicates that the connection was most likely closed or + * is in an error state where it is no longer accepting new input. + * + * @since 0.3.0 + * + * @param buf Char buffer to read into the websocket + * @param len Length of buf + * @return The number of characters from buf actually read. + */ + size_t read_all(char const * buf, size_t len) { + size_t total_read = 0; + size_t temp_read = 0; + + do { + temp_read = this->read_some_impl(buf+total_read,len-total_read); + total_read += temp_read; + } while (temp_read != 0 && total_read < len); + + return total_read; + } + + // debug stuff to invoke the async handlers + void expire_timer(lib::error_code const & ec) { + m_timer_handler(ec); + } + + void fullfil_write() { + m_write_handler(lib::error_code()); + } +protected: + /// Initialize the connection transport + /** + * Initialize the connection's transport component. + * + * @param handler The `init_handler` to call when initialization is done + */ + void init(init_handler handler) { + m_alog.write(log::alevel::devel,"debug connection init"); + handler(lib::error_code()); + } + + /// Initiate an async_read for at least num_bytes bytes into buf + /** + * Initiates an async_read request for at least num_bytes bytes. The input + * will be read into buf. A maximum of len bytes will be input. When the + * operation is complete, handler will be called with the status and number + * of bytes read. + * + * This method may or may not call handler from within the initial call. The + * application should be prepared to accept either. + * + * The application should never call this method a second time before it has + * been called back for the first read. If this is done, the second read + * will be called back immediately with a double_read error. + * + * If num_bytes or len are zero handler will be called back immediately + * indicating success. + * + * @param num_bytes Don't call handler until at least this many bytes have + * been read. + * @param buf The buffer to read bytes into + * @param len The size of buf. At maximum, this many bytes will be read. + * @param handler The callback to invoke when the operation is complete or + * ends in an error + */ + void async_read_at_least(size_t num_bytes, char * buf, size_t len, + read_handler handler) + { + std::stringstream s; + s << "debug_con async_read_at_least: " << num_bytes; + m_alog.write(log::alevel::devel,s.str()); + + if (num_bytes > len) { + handler(make_error_code(error::invalid_num_bytes),size_t(0)); + return; + } + + if (m_reading == true) { + handler(make_error_code(error::double_read),size_t(0)); + return; + } + + if (num_bytes == 0 || len == 0) { + handler(lib::error_code(),size_t(0)); + return; + } + + m_buf = buf; + m_len = len; + m_bytes_needed = num_bytes; + m_read_handler = handler; + m_cursor = 0; + m_reading = true; + } + + /// Asyncronous Transport Write + /** + * Write len bytes in buf to the output stream. Call handler to report + * success or failure. handler may or may not be called during async_write, + * but it must be safe for this to happen. + * + * Will return 0 on success. + * + * @param buf buffer to read bytes from + * @param len number of bytes to write + * @param handler Callback to invoke with operation status. + */ + void async_write(char const *, size_t, write_handler handler) { + m_alog.write(log::alevel::devel,"debug_con async_write"); + m_write_handler = handler; + } + + /// Asyncronous Transport Write (scatter-gather) + /** + * Write a sequence of buffers to the output stream. Call handler to report + * success or failure. handler may or may not be called during async_write, + * but it must be safe for this to happen. + * + * Will return 0 on success. + * + * @param bufs vector of buffers to write + * @param handler Callback to invoke with operation status. + */ + void async_write(std::vector<buffer> const &, write_handler handler) { + m_alog.write(log::alevel::devel,"debug_con async_write buffer list"); + m_write_handler = handler; + } + + /// Set Connection Handle + /** + * @param hdl The new handle + */ + void set_handle(connection_hdl) {} + + /// Call given handler back within the transport's event system (if present) + /** + * Invoke a callback within the transport's event system if it has one. If + * it doesn't, the handler will be invoked immediately before this function + * returns. + * + * @param handler The callback to invoke + * + * @return Whether or not the transport was able to register the handler for + * callback. + */ + lib::error_code dispatch(dispatch_handler handler) { + handler(); + return lib::error_code(); + } + + /// Perform cleanup on socket shutdown_handler + /** + * @param h The `shutdown_handler` to call back when complete + */ + void async_shutdown(shutdown_handler handler) { + handler(lib::error_code()); + } + + size_t read_some_impl(char const * buf, size_t len) { + m_alog.write(log::alevel::devel,"debug_con read_some"); + + if (!m_reading) { + m_elog.write(log::elevel::devel,"write while not reading"); + return 0; + } + + size_t bytes_to_copy = (std::min)(len,m_len-m_cursor); + + std::copy(buf,buf+bytes_to_copy,m_buf+m_cursor); + + m_cursor += bytes_to_copy; + + if (m_cursor >= m_bytes_needed) { + complete_read(lib::error_code()); + } + + return bytes_to_copy; + } + + /// Signal that a requested read is complete + /** + * Sets the reading flag to false and returns the handler that should be + * called back with the result of the read. The cursor position that is sent + * is whatever the value of m_cursor is. + * + * It MUST NOT be called when m_reading is false. + * it MUST be called while holding the read lock + * + * It is important to use this method rather than directly setting/calling + * m_read_handler back because this function makes sure to delete the + * locally stored handler which contains shared pointers that will otherwise + * cause circular reference based memory leaks. + * + * @param ec The error code to forward to the read handler + */ + void complete_read(lib::error_code const & ec) { + m_reading = false; + + read_handler handler = m_read_handler; + m_read_handler = read_handler(); + + handler(ec,m_cursor); + } +private: + timer_handler m_timer_handler; + + // Read space (Protected by m_read_mutex) + char * m_buf; + size_t m_len; + size_t m_bytes_needed; + read_handler m_read_handler; + size_t m_cursor; + + // transport resources + connection_hdl m_connection_hdl; + write_handler m_write_handler; + shutdown_handler m_shutdown_handler; + + bool m_reading; + bool const m_is_server; + bool m_is_secure; + alog_type & m_alog; + elog_type & m_elog; + std::string m_remote_endpoint; +}; + + +} // namespace debug +} // namespace transport +} // namespace websocketpp + +#endif // WEBSOCKETPP_TRANSPORT_DEBUG_CON_HPP |