base.hpp
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/*
* 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_IOSTREAM_BASE_HPP
#define WEBSOCKETPP_TRANSPORT_IOSTREAM_BASE_HPP
#include <websocketpp/common/system_error.hpp>
#include <websocketpp/common/cpp11.hpp>
#include <websocketpp/common/functional.hpp>
#include <websocketpp/common/connection_hdl.hpp>
#include <websocketpp/transport/base/connection.hpp>
#include <string>
#include <vector>
namespace websocketpp {
namespace transport {
/// Transport policy that uses STL iostream for I/O and does not support timers
namespace iostream {
/// The type and signature of the callback used by iostream transport to write
typedef lib::function<lib::error_code(connection_hdl, char const *, size_t)>
write_handler;
/// The type and signature of the callback used by iostream transport to perform
/// vectored writes.
/**
* If a vectored write handler is not set the standard write handler will be
* called multiple times.
*/
typedef lib::function<lib::error_code(connection_hdl, std::vector<transport::buffer> const
& bufs)> vector_write_handler;
/// The type and signature of the callback used by iostream transport to signal
/// a transport shutdown.
typedef lib::function<lib::error_code(connection_hdl)> shutdown_handler;
/// iostream transport errors
namespace error {
enum value {
/// Catch-all error for transport policy errors that don't fit in other
/// categories
general = 1,
/// async_read_at_least call requested more bytes than buffer can store
invalid_num_bytes,
/// async_read called while another async_read was in progress
double_read,
/// An operation that requires an output stream was attempted before
/// setting one.
output_stream_required,
/// stream error
bad_stream
};
/// iostream transport error category
class category : public lib::error_category {
public:
category() {}
char const * name() const _WEBSOCKETPP_NOEXCEPT_TOKEN_ {
return "websocketpp.transport.iostream";
}
std::string message(int value) const {
switch(value) {
case general:
return "Generic iostream transport policy error";
case invalid_num_bytes:
return "async_read_at_least call requested more bytes than buffer can store";
case double_read:
return "Async read already in progress";
case output_stream_required:
return "An output stream to be set before async_write can be used";
case bad_stream:
return "A stream operation returned ios::bad";
default:
return "Unknown";
}
}
};
/// Get a reference to a static copy of the iostream transport error category
inline lib::error_category const & get_category() {
static category instance;
return instance;
}
/// Get an error code with the given value and the iostream transport category
inline lib::error_code make_error_code(error::value e) {
return lib::error_code(static_cast<int>(e), get_category());
}
} // namespace error
} // namespace iostream
} // namespace transport
} // namespace websocketpp
_WEBSOCKETPP_ERROR_CODE_ENUM_NS_START_
template<> struct is_error_code_enum<websocketpp::transport::iostream::error::value>
{
static bool const value = true;
};
_WEBSOCKETPP_ERROR_CODE_ENUM_NS_END_
#endif // WEBSOCKETPP_TRANSPORT_IOSTREAM_BASE_HPP