/*-
 * Public Domain 2014-present MongoDB, Inc.
 * Public Domain 2008-2014 WiredTiger, Inc.
 *
 * This is free and unencumbered software released into the public domain.
 *
 * Anyone is free to copy, modify, publish, use, compile, sell, or
 * distribute this software, either in source code form or as a compiled
 * binary, for any purpose, commercial or non-commercial, and by any
 * means.
 *
 * In jurisdictions that recognize copyright laws, the author or authors
 * of this software dedicate any and all copyright interest in the
 * software to the public domain. We make this dedication for the benefit
 * of the public at large and to the detriment of our heirs and
 * successors. We intend this dedication to be an overt act of
 * relinquishment in perpetuity of all present and future rights to this
 * software under copyright law.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * ex_event_handler.c
 *	Demonstrate how to use the WiredTiger event handler mechanism.
 */
#include <test_util.h>

static const char *home;

int handle_wiredtiger_error(WT_EVENT_HANDLER *, WT_SESSION *, int, const char *);
int handle_wiredtiger_message(WT_EVENT_HANDLER *, WT_SESSION *, const char *);

/*! [Function event_handler] */
/*
 * Create our own event handler structure to allow us to pass context through to event handler
 * callbacks. For this to work the WiredTiger event handler must appear first in our custom event
 * handler structure.
 */
typedef struct {
    WT_EVENT_HANDLER h;
    const char *app_id;
} CUSTOM_EVENT_HANDLER;

/*
 * handle_wiredtiger_error --
 *     Function to handle error callbacks from WiredTiger.
 */
int
handle_wiredtiger_error(
  WT_EVENT_HANDLER *handler, WT_SESSION *session, int error, const char *message)
{
    CUSTOM_EVENT_HANDLER *custom_handler;

    /* Cast the handler back to our custom handler. */
    custom_handler = (CUSTOM_EVENT_HANDLER *)handler;

    /* Report the error on the console. */
    fprintf(stderr, "app_id %s, thread context %p, error %d, message %s\n", custom_handler->app_id,
      (void *)session, error, message);

    /* Exit if the database has a fatal error. */
    if (error == WT_PANIC)
        exit(1);

    return (0);
}

/*
 * handle_wiredtiger_message --
 *     Function to handle message callbacks from WiredTiger.
 */
int
handle_wiredtiger_message(WT_EVENT_HANDLER *handler, WT_SESSION *session, const char *message)
{
    /* Cast the handler back to our custom handler. */
    printf("app id %s, thread context %p, message %s\n", ((CUSTOM_EVENT_HANDLER *)handler)->app_id,
      (void *)session, message);

    return (0);
}
/*! [Function event_handler] */

static void
config_event_handler(void)
{
    WT_CONNECTION *conn;
    WT_SESSION *session;

    /*! [Configure event_handler] */
    CUSTOM_EVENT_HANDLER event_handler;

    event_handler.h.handle_error = handle_wiredtiger_error;
    event_handler.h.handle_message = handle_wiredtiger_message;
    /* Set handlers to NULL to use the default handler. */
    event_handler.h.handle_progress = NULL;
    event_handler.h.handle_close = NULL;
    event_handler.app_id = "example_event_handler";

    error_check(wiredtiger_open(home, (WT_EVENT_HANDLER *)&event_handler, "create", &conn));
    /*! [Configure event_handler] */

    /* Make an invalid API call, to ensure the event handler works. */
    fprintf(stderr, "ex_event_handler: expect an error message to follow:\n");
    (void)conn->open_session(conn, NULL, "isolation=invalid", &session);
    fprintf(stderr, "ex_event_handler: end of error message\n");

    error_check(conn->close(conn, NULL));
}

int
main(int argc, char *argv[])
{
    home = example_setup(argc, argv);

    config_event_handler();

    return (EXIT_SUCCESS);
}