writer.h
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/**
* \file
* Write ready responses to an output stream.
*
* \author Georg Hopp
*
* \copyright
* Copyright © 2012 Georg Hopp
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __HTTP_WRITER_H__
#define __HTTP_WRITER_H__
#include <sys/types.h>
#include "class.h"
#include "http/message.h"
#include "queue.h"
#include "stream.h"
#include "commons.h"
/*
* the buffer that will be written back to an http client.
* If we have open 1024 paralell connection this will result
* in a memory usage of 128MB. Right now, we don't allow more
* than this amount of paralell connections.
*
* This one and the parser buffer are the hugest memory pools
* we need. The parser buffer is of the same size.
*
* Right now only the ringbuffer is reused for each connection
* resulting in some memory movement between some temporary
* space and the circular buffer.
*
* This behavioru should be kept in place for low memory machines
* running this code.
*
* Anyway, I will build a version which uses two ringbuffers for
* each connection, Resulting in a 256KB memory used for each
* connection. Which in turn means 256MB for 1024 paralell connections.
*
* And as I will also implement a cbuf pool, this memory will not be
* freed before application end.
*/
/*
* This is the multiplier for the size of the initial write buffer.
* It is used to store the
* string representation of the message, as well as the first part of
* the body if the headers exceed the size a multiple of this will
* be reserved...very unlikely, but not impossible.
* If no the whole body fits within this buffer only part of it will
* be copied in there. The rest will be send in following send calls.
*/
#define WRITER_BUF_CHUNK 1024 * 10 // our default buffer chunk for
// headers is 10k. This will result
// in at least 20m for 2000 concurrent
// connections.
typedef enum e_HttpWriterState {
HTTP_WRITER_GET=0,
HTTP_WRITER_WRITE,
HTTP_WRITER_DONE
} HttpWriterState;
CLASS(HttpWriter) {
char * buffer;
Queue queue;
HttpMessage current;
size_t nbuffer; // size of buffer
size_t nheader; // size headers in buf
size_t nbody; // sizeof body in buffer
size_t written; // already written bytes
HttpWriterState state;
};
ssize_t httpWriterWrite(void *, Stream);
#endif // __HTTP_WRITER_H__
// vim: set ts=4 sw=4: