proto.c

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/*
 * Copyright (c) 2008 Jiri Svoboda
 * 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
 */

#include <stdio.h>
#include <stdlib.h>
#include <adt/hash_table.h>

#include "trace.h"
#include "proto.h"

#define SRV_PROTO_TABLE_CHAINS 32
#define METHOD_OPER_TABLE_CHAINS 32

hash_table_t srv_proto;

typedef struct {
        unsigned srv;
        proto_t *proto;
        link_t link;
} srv_proto_t;

typedef struct {
        sysarg_t method;
        oper_t *oper;
        link_t link;
} method_oper_t;

static hash_index_t srv_proto_hash(unsigned long key[]);
static int srv_proto_compare(unsigned long key[], hash_count_t keys,
    link_t *item);
static void srv_proto_remove_callback(link_t *item);

hash_table_operations_t srv_proto_ops = {
        .hash = srv_proto_hash,
        .compare = srv_proto_compare,
        .remove_callback = srv_proto_remove_callback
};

static hash_index_t method_oper_hash(unsigned long key[]);
static int method_oper_compare(unsigned long key[], hash_count_t keys,
    link_t *item);
static void method_oper_remove_callback(link_t *item);

hash_table_operations_t method_oper_ops = {
        .hash = method_oper_hash,
        .compare = method_oper_compare,
        .remove_callback = method_oper_remove_callback
};

static hash_index_t srv_proto_hash(unsigned long key[])
{
        return key[0] % SRV_PROTO_TABLE_CHAINS;
}

static int srv_proto_compare(unsigned long key[], hash_count_t keys,
    link_t *item)
{
        srv_proto_t *sp;

        sp = hash_table_get_instance(item, srv_proto_t, link);

        return key[0] == sp->srv;
}

static void srv_proto_remove_callback(link_t *item)
{
}

static hash_index_t method_oper_hash(unsigned long key[])
{
        return key[0] % METHOD_OPER_TABLE_CHAINS;
}

static int method_oper_compare(unsigned long key[], hash_count_t keys,
    link_t *item)
{
        method_oper_t *mo;

        mo = hash_table_get_instance(item, method_oper_t, link);

        return key[0] == mo->method;
}

static void method_oper_remove_callback(link_t *item)
{
}


void proto_init(void)
{
        hash_table_create(&srv_proto, SRV_PROTO_TABLE_CHAINS, 1,
            &srv_proto_ops);
}

void proto_cleanup(void)
{
        hash_table_destroy(&srv_proto);
}

void proto_register(int srv, proto_t *proto)
{
        srv_proto_t *sp;
        unsigned long key;

        sp = malloc(sizeof(srv_proto_t));
        sp->srv = srv;
        sp->proto = proto;
        key = srv;

        hash_table_insert(&srv_proto, &key, &sp->link);
}

proto_t *proto_get_by_srv(int srv)
{
        unsigned long key;
        link_t *item;
        srv_proto_t *sp;

        key = srv;
        item = hash_table_find(&srv_proto, &key);
        if (item == NULL) return NULL;

        sp = hash_table_get_instance(item, srv_proto_t, link);
        return sp->proto;
}

static void proto_struct_init(proto_t *proto, const char *name)
{
        proto->name = name;
        hash_table_create(&proto->method_oper, SRV_PROTO_TABLE_CHAINS, 1,
            &method_oper_ops);
}

proto_t *proto_new(const char *name)
{
        proto_t *p;

        p = malloc(sizeof(proto_t));
        proto_struct_init(p, name);

        return p;
}

void proto_delete(proto_t *proto)
{
        free(proto);
}

void proto_add_oper(proto_t *proto, int method, oper_t *oper)
{
        method_oper_t *mo;
        unsigned long key;

        mo = malloc(sizeof(method_oper_t));
        mo->method = method;
        mo->oper = oper;
        key = method;

        hash_table_insert(&proto->method_oper, &key, &mo->link);        
}

oper_t *proto_get_oper(proto_t *proto, int method)
{
        unsigned long key;
        link_t *item;
        method_oper_t *mo;

        key = method;
        item = hash_table_find(&proto->method_oper, &key);
        if (item == NULL) return NULL;

        mo = hash_table_get_instance(item, method_oper_t, link);
        return mo->oper;
}

static void oper_struct_init(oper_t *oper, const char *name)
{
        oper->name = name;
}

oper_t *oper_new(const char *name, int argc, val_type_t *arg_types,
    val_type_t rv_type, int respc, val_type_t *resp_types)
{
        oper_t *o;
        int i;

        o = malloc(sizeof(oper_t));
        oper_struct_init(o, name);

        o->argc = argc;
        for (i = 0; i < argc; i++)
                o->arg_type[i] = arg_types[i];

        o->rv_type = rv_type;

        o->respc = respc;
        for (i = 0; i < respc; i++)
                o->resp_type[i] = resp_types[i];

        return o;
}

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