worker.c

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/**
 * \file
 *
 * \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/>.
 */

#define _GNU_SOURCE

#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <search.h>

#include "class.h"
#include "stream.h"
#include "hash.h"
#include "queue.h"
#include "http/worker.h"
#include "http/parser.h"
#include "http/writer.h"

#include "utils/memory.h"
#include "interface/subject.h"
#include "interface/observer.h"

static
int
httpWorkerCtor(void * _this, va_list * params)
{
    HttpWorker this = _this;
    char *     id   = va_arg(*params, char *);
    char       cbuf_id[100];

    this->id  = memMalloc(strlen(id) + 1);
    strcpy(this->id, id);

    this->asset_pool = new(Hash);

    sprintf(cbuf_id, "%s_%s", "parser", id);
    this->pbuf   = new(Cbuf, cbuf_id, PARSER_MAX_BUF);

    this->additional_headers = new(Queue);

    this->parser = new(HttpParser, this->pbuf);
    this->writer = new(HttpWriter);

    return 0;
}

static
void
httpWorkerDtor(void * _this)
{
    HttpWorker this = _this;

    MEM_FREE(this->id);

    delete(this->additional_headers);

    delete(this->parser);
    delete(this->writer);

    if (NULL != this->pbuf) {
        delete(this->asset_pool);
        delete(this->pbuf); //!< cloned workers have NULL, so delete won't do anything
    }
}

static
void
httpWorkerClone(void * _this, void * _base)
{
    HttpWorker this = _this;
    HttpWorker base = _base;

    this->asset_pool          = base->asset_pool;
    this->application_adapter = base->application_adapter;

    this->additional_headers = new(Queue);

    this->parser = new(HttpParser, base->pbuf);
    /*
     * I am pretty sure that it is not neccessary to have a
     * separeate writer for each connection...
     * Right now I leave it that way.
     * TODO check this.
     * OK some facts:
     * - the stream as well as the worker are associated
     *   to the filehandle within the server.
     * - the response queue is located within the writer.
     *   (this might be wrong...the response queue should
     *   be part of the worker. That way I could give it
     *   into the writer when writing. That way only one
     *   instance of the writer might be possible...)
     *   NO, the previous statement is wrong...this would
     *   involve much more organization overhead within
     *   the writer...queue change and such...
     *   At the end I think it might be best to leave it as
     *   it is.
     */
    this->writer = new(HttpWriter);
}

ssize_t httpWorkerProcess(void *, Stream);
ssize_t httpWorkerWrite(void *, Stream);

static
void
httpWorkerDetach(void * _this, void * adapter)
{
    HttpWorker this = (HttpWorker)_this;

    if (NULL != this->application_adapter) {
        delete(this->application_adapter);
    }
}

static
void
httpWorkerAttach(void * _this, void * adapter)
{
    HttpWorker this = (HttpWorker)_this;

    /*
     * right now only one adapter is allowed and the last
     * added will be used....all others will be deleted in
     * assumption that no other handle does exist anymore
     * (because it was added as an adapter and thus is good
     * for nothing else.)
     */
    httpWorkerDetach(_this, adapter);

    this->application_adapter = adapter;
}

static
void
httpWorkerNotify(void * _this)
{
    HttpWorker this = (HttpWorker)_this;

    observerUpdate(this->application_adapter, _this);
}

INIT_IFACE(Class, httpWorkerCtor, httpWorkerDtor, httpWorkerClone);
INIT_IFACE(StreamReader, httpWorkerProcess);
INIT_IFACE(StreamWriter, httpWorkerWrite);
INIT_IFACE(Subject, httpWorkerAttach, httpWorkerDetach, httpWorkerNotify);
CREATE_CLASS(
        HttpWorker,
        NULL, 
        IFACE(Class),
        IFACE(StreamReader),
        IFACE(StreamWriter),
        IFACE(Subject));

// vim: set ts=4 sw=4: