/* A simple standalone XML-RPC server program written in C as an example of
   use of the Xmlrpc-c libraries.

   This example expects an already bound socket on Standard Input, ready to
   be listened on for client connections.  Also see xmlrpc_sample_add_server,
   which is the same thing, except you tell it a TCP port number and it
   creates the socket itself.  Also see xmlrpc_inetd_server.c, which is
   the same thing except you give it a socket which is already connected
   to a client.

   Example:

   $ socketexec -local_port=8080 ./xmlrpc_socket_server
*/

#define WIN32_LEAN_AND_MEAN  /* required by xmlrpc-c/server_abyss.h */

#include <stdlib.h>
#include <stdio.h>
#ifdef _WIN32
#  include <windows.h>
#else
#  include <unistd.h>
#endif

#include <xmlrpc-c/base.h>
#include <xmlrpc-c/server.h>
#include <xmlrpc-c/server_abyss.h>

#include "config.h"  /* information about this build environment */

#ifdef _WIN32
  #define SLEEP(seconds) SleepEx(seconds * 1000, 1);
#else
  #define SLEEP(seconds) sleep(seconds);
#endif


static xmlrpc_value *
sample_add(xmlrpc_env *   const envP,
           xmlrpc_value * const paramArrayP,
           void *         const serverInfo,
           void *         const channelInfo) {

    xmlrpc_int32 x, y, z;

    /* Parse our argument array. */
    xmlrpc_decompose_value(envP, paramArrayP, "(ii)", &x, &y);
    if (envP->fault_occurred)
        return NULL;

    /* Add our two numbers. */
    z = x + y;

    /* Sometimes, make it look hard (so client can see what it's like
       to do an RPC that takes a while).
    */
    if (y == 1)
        SLEEP(2);

    /* Return our result. */
    return xmlrpc_build_value(envP, "i", z);
}



int 
main(int           const argc, 
     const char ** const argv) {

    struct xmlrpc_method_info3 const methodInfo = {
        .methodName     = "sample.add",
        .methodFunction = &sample_add,
        .serverInfo = NULL
    };
    xmlrpc_server_abyss_parms serverparm;
    xmlrpc_registry * registryP;
    xmlrpc_env env;

    if (argc-1 != 0) {
        fprintf(stderr, "There are no arguments.  You must supply a "
                "bound socket on which to listen for client connections "
                "as Standard Input\n");
        if (argv) {} /* silence unused parameter warning */
        exit(1);
    }
    
    xmlrpc_env_init(&env);

    registryP = xmlrpc_registry_new(&env);

    xmlrpc_registry_add_method3(&env, registryP, &methodInfo);

    /* In the modern form of the Abyss API, we supply parameters in memory
       like a normal API.  We select the modern form by setting
       config_file_name to NULL: 
    */
    serverparm.config_file_name   = NULL;
    serverparm.registryP          = registryP;
    serverparm.log_file_name      = "/tmp/xmlrpc_log";
    serverparm.keepalive_timeout  = 0;
    serverparm.keepalive_max_conn = 0;
    serverparm.timeout            = 0;
    serverparm.dont_advertise     = FALSE;
    serverparm.socket_bound       = TRUE;
    serverparm.socket_handle      = STDIN_FILENO;

    printf("Running XML-RPC server...\n");

    xmlrpc_server_abyss(&env, &serverparm, XMLRPC_APSIZE(socket_handle));

    return 0;
}
