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Directory :  /www/server/mysql/src/plugin/innodb_memcached/daemon_memcached/extensions/loggers/

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Current File : /www/server/mysql/src/plugin/innodb_memcached/daemon_memcached/extensions/loggers/eventlog_logger.c
/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
#include "config.h"
#include <windows.h>
#include <stdarg.h>
#include <stdio.h>
#include <memcached/extension.h>
#include <memcached/engine.h>
#include "protocol_extension.h"

static EXTENSION_LOG_LEVEL current_log_level = EXTENSION_LOG_WARNING;
SERVER_HANDLE_V1 *sapi;

static HANDLE handle;

static const char *get_name(void) {
    return "Windows Event Log";
}

static DWORD map_priority(EXTENSION_LOG_LEVEL severity)
{
    DWORD priority;
    switch (severity) {
    case EXTENSION_LOG_WARNING:
        priority = EVENTLOG_ERROR_TYPE;
        break;
    case EXTENSION_LOG_INFO:
        priority = EVENTLOG_WARNING_TYPE;
        break;
    default:
        priority = EVENTLOG_INFORMATION_TYPE;
    }

    return priority;
}

static void logger_log(EXTENSION_LOG_LEVEL severity,
                       const void* client_cookie,
                       const char *fmt, ...)
{
    (void)client_cookie;
    if (severity >= current_log_level) {
        char buffer[2048];
        const char *strings[1] = {
            [0] = buffer
        };
        va_list ap;
        va_start(ap, fmt);
        int len = vsnprintf(buffer, sizeof(buffer), fmt, ap);
        va_end(ap);

        if (len != -1) {
            ReportEvent(handle, map_priority(severity), 0, 0,
                        NULL, 1, 0, strings, NULL);
        }
    }
}

static EXTENSION_LOGGER_DESCRIPTOR descriptor = {
    .get_name = get_name,
    .log = logger_log
};

static void on_log_level(const void *cookie, ENGINE_EVENT_TYPE type,
                         const void *event_data, const void *cb_data) {
    if (sapi != NULL) {
        current_log_level = sapi->log->get_level();
    }
}

MEMCACHED_PUBLIC_API
EXTENSION_ERROR_CODE memcached_extensions_initialize(const char *config,
                                                     GET_SERVER_API get_server_api) {

    sapi = get_server_api();
    if (sapi == NULL) {
        return EXTENSION_FATAL;
    }

    current_log_level = sapi->log->get_level();

    if ((handle = RegisterEventSource(NULL, "memcached")) == NULL) {
        fprintf(stderr, "Failed to register event source\n");
        return EXTENSION_FATAL;
    }

    if (!sapi->extension->register_extension(EXTENSION_LOGGER, &descriptor)) {
        return EXTENSION_FATAL;
    }

    sapi->callback->register_callback(NULL, ON_LOG_LEVEL, on_log_level, NULL);

    return EXTENSION_SUCCESS;
}

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