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/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2010-2017 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _PASSENGER_APACHE2_MODULE_BUCKET_H_
#define _PASSENGER_APACHE2_MODULE_BUCKET_H_
#include <boost/shared_ptr.hpp>
#include <apr_buckets.h>
#include <FileDescriptor.h>
namespace Passenger {
namespace Apache2Module {
using namespace boost;
struct PassengerBucketState {
/** The number of bytes that this PassengerBucket has read so far. */
unsigned long bytesRead;
/** Whether this PassengerBucket is completed, i.e. no more data
* can be read from the underlying file descriptor. When true,
* this can either mean that EOF has been reached, or that an I/O
* error occured. Use errorCode to check whether an error occurred.
*/
bool completed;
/** When completed is true, errorCode contains the errno value of
* the last read() call.
*
* A value of 0 means that no error occured.
*/
int errorCode;
/** Connection to the Passenger core. */
FileDescriptor connection;
PassengerBucketState(const FileDescriptor &conn) {
bytesRead = 0;
completed = false;
errorCode = 0;
connection = conn;
}
};
typedef boost::shared_ptr<PassengerBucketState> PassengerBucketStatePtr;
/**
* We used to use an apr_bucket_pipe for forwarding the backend process's
* response to the HTTP client. However, apr_bucket_pipe has a number of
* issues:
* - It closes the pipe's file descriptor when it has reached
* end-of-stream, but not when an error has occurred. This behavior is
* undesirable because it can easily cause file descriptor leaks.
* - It does weird non-blocking-I/O related things which can cause it
* to read less data than can actually be read.
*
* PassengerBucket is like apr_bucket_pipe, but:
* - It also holds a reference to the connection with the Passenger core.
* When a read error has occured or when end-of-stream has been reached
* this connection will be closed.
* - It ignores the APR_NONBLOCK_READ flag because that's known to cause
* strange I/O problems.
* - It can store its current state in a PassengerBucketState data structure.
*/
apr_bucket *passenger_bucket_create(const PassengerBucketStatePtr &state,
apr_bucket_alloc_t *list,
bool bufferResponse);
} // namespace Apache2Module
} // namespace Passenger
#endif /* _PASSENGER_APACHE2_MODULE_BUCKET_H_ */