pack-unpack.c

An example that shows how to use rpc_object_pack and rpc_object_unpack APIs.

/*
 * Copyright 2017 Two Pore Guys, Inc.
 * All rights reserved
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted providing that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * 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 <errno.h>
#include <string.h>
#include <inttypes.h>
#include <rpc/object.h>
#include <rpc/client.h>
#include <rpc/server.h>
#include <rpc/typing.h>
#include <rpc/service.h>

int
main(int argc, const char *argv[])
{
    rpc_context_t ctx;
    rpc_server_t server;
    rpc_client_t client;
    rpc_connection_t conn;
    rpc_object_t result;
    const char *keys[] = {"key"};
    const rpc_object_t values[] = {rpc_int64_create(11234)};

    (void)argc;
    (void)argv;

    ctx = rpc_context_create();

    rpc_context_register_block(ctx, NULL, "hello", NULL,
        ^(void *cookie, rpc_object_t args) {
        const char *str;
        int64_t num;
        int64_t dict_num;
        int cnt;
        bool sure;
        rpc_object_t nonexistent_obj = NULL;

        (void)cookie;

        rpct_init(true);
        cnt = rpc_object_unpack(args, "[s,i,b,{nonexistent:v,key:i}]",
            &str, &num, &sure, &nonexistent_obj, &dict_num);

        if (nonexistent_obj != NULL)
            printf("Nonexistent obj shouldn't be initialized");

        printf("unpack cnt: %i\n", cnt);

        printf("str = %s, num = %" PRId64 ", dict_num = %" PRId64
            ", sure = %s\n", str, num, dict_num,
            sure ? "true" : "false");

            return rpc_object_pack("{inline:'inline_string',s,i,uint:u,b,n,array:['inline',i,5:i,<int64>i,{s}]}",
            "hello", "world",
            "int", -12345L,
            0x80808080L,
            "true_or_false", true,
            "nothing",
            1L, 2L, 3L, "!", "?");
    });

    server = rpc_server_create("loopback://0", ctx);
    rpc_server_resume(server);
    if (server == NULL) {
        fprintf(stderr, "cannot create server: %s", strerror(errno));
        return (1);
    }

    client = rpc_client_create("loopback://0", 0);
    if (client == NULL) {
        fprintf(stderr, "cannot connect: %s", strerror(errno));
        return (1);
    }

    conn = rpc_client_get_connection(client);
    result = rpc_connection_call_simple(conn, "hello", "[s,i,b,v]",
        "world", 123, true,
        rpc_dictionary_create_ex(keys, values, 1, true));

    printf("result = %s\n", rpc_copy_description(result));

    rpc_client_close(client);
    rpc_server_close(server);
    return (0);
}