/* Editor Settings: expandtabs and use 4 spaces for indentation
 * ex: set softtabstop=4 tabstop=8 expandtab shiftwidth=4: *
 * -*- mode: c, c-basic-offset: 4 -*- */

/*
 * Copyright Likewise Software    2004-2008
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.  You should have received a copy of the GNU General
 * Public License along with this program.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * LIKEWISE SOFTWARE MAKES THIS SOFTWARE AVAILABLE UNDER OTHER LICENSING
 * TERMS AS WELL.  IF YOU HAVE ENTERED INTO A SEPARATE LICENSE AGREEMENT
 * WITH LIKEWISE SOFTWARE, THEN YOU MAY ELECT TO USE THE SOFTWARE UNDER THE
 * TERMS OF THAT SOFTWARE LICENSE AGREEMENT INSTEAD OF THE TERMS OF THE GNU
 * GENERAL PUBLIC LICENSE, NOTWITHSTANDING THE ABOVE NOTICE.  IF YOU
 * HAVE QUESTIONS, OR WISH TO REQUEST A COPY OF THE ALTERNATE LICENSING
 * TERMS OFFERED BY LIKEWISE SOFTWARE, PLEASE CONTACT LIKEWISE SOFTWARE AT
 * license@likewisesoftware.com
 */

/*
 * Copyright (C) Likewise Software. All rights reserved.
 *
 * Module Name:
 *
 *        sharedb.h
 *
 * Abstract:
 *
 *        Likewise IO (LWIO) - SRV
 *
 *        Share Repository based on sqlite
 *
 *        Database Context
 *
 * Authors: Sriram Nambakam (snambakam@likewisesoftware.com)
 *
 */

#include "includes.h"

static
VOID
SrvShareDbFreeContext(
    PSRV_SHARE_DB_CONTEXT pDbContext
    );

NTSTATUS
SrvShareDbAcquireContext(
    PSRV_SHARE_DB_CONTEXT* ppDbContext
    )
{
    NTSTATUS ntStatus = 0;
    BOOLEAN bInLock = FALSE;
    PSRV_SHARE_DB_GLOBALS pGlobals = &gShareRepository_lwshare;
    PSRV_SHARE_DB_CONTEXT pDbContext = NULL;

    LWIO_LOCK_MUTEX(bInLock, &pGlobals->mutex);

    if (pGlobals->ulNumDbContexts)
    {
        pDbContext = pGlobals->pDbContextList;
        pGlobals->pDbContextList = pGlobals->pDbContextList->pNext;
        pDbContext->pNext = NULL;

        pGlobals->ulNumDbContexts--;

        LWIO_UNLOCK_MUTEX(bInLock, &pGlobals->mutex);
    }
    else
    {
        PCSTR pszShareDbPath = LWIO_SRV_SHARE_DB;

        ntStatus = SrvAllocateMemory(
                        sizeof(SRV_SHARE_DB_CONTEXT),
                        (PVOID*)&pDbContext);
        BAIL_ON_NT_STATUS(ntStatus);

        ntStatus = sqlite3_open(
                        pszShareDbPath,
                        &pDbContext->pDbHandle);
        if (ntStatus)
        {
            LWIO_LOG_ERROR("Sqlite3 Error (code: %d): %s",
                                    ntStatus,
                                    "Failed to open database handle""");
            ntStatus = STATUS_INTERNAL_DB_ERROR;
        }
        BAIL_ON_NT_STATUS(ntStatus);
    }

    *ppDbContext = pDbContext;

cleanup:

    LWIO_UNLOCK_MUTEX(bInLock, &pGlobals->mutex);

    return ntStatus;

error:

    *ppDbContext = NULL;

    if (pDbContext)
    {
        SrvShareDbFreeContext(pDbContext);
    }

    goto cleanup;
}

VOID
SrvShareDbReleaseContext(
    PSRV_SHARE_DB_CONTEXT pDbContext
    )
{
    BOOLEAN bInLock = FALSE;
    PSRV_SHARE_DB_GLOBALS pGlobals = &gShareRepository_lwshare;

    LWIO_LOCK_MUTEX(bInLock, &pGlobals->mutex);

    if (pGlobals->ulNumDbContexts < pGlobals->ulMaxNumDbContexts)
    {
        SrvShareDbFreeContext(pDbContext);
    }
    else
    {
        pDbContext->pNext = pGlobals->pDbContextList;
        pGlobals->pDbContextList = pDbContext;

        pGlobals->ulNumDbContexts++;
    }

    LWIO_UNLOCK_MUTEX(bInLock, &pGlobals->mutex);
}

static
VOID
SrvShareDbFreeContext(
    PSRV_SHARE_DB_CONTEXT pDbContext
    )
{
    if (pDbContext->pInsertStmt)
    {
        sqlite3_finalize(pDbContext->pInsertStmt);
    }
    if (pDbContext->pEnumStmt)
    {
        sqlite3_finalize(pDbContext->pEnumStmt);
    }
    if (pDbContext->pDeleteStmt)
    {
        sqlite3_finalize(pDbContext->pDeleteStmt);
    }
    if (pDbContext->pCountStmt)
    {
        sqlite3_finalize(pDbContext->pCountStmt);
    }
    if (pDbContext->pFindStmt)
    {
        sqlite3_finalize(pDbContext->pFindStmt);
    }
    if (pDbContext->pDbHandle)
    {
        sqlite3_close(pDbContext->pDbHandle);
    }

    SrvFreeMemory(pDbContext);
}