зеркало из https://github.com/mozilla/pjs.git
1072 строки
32 KiB
C++
1072 строки
32 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is nsDiskCacheDevice.cpp, released
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* February 22, 2001.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Gordon Sheridan <gordon@netscape.com>
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* Patrick C. Beard <beard@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include <limits.h>
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// include files for ftruncate (or equivalent)
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#if defined(XP_UNIX) || defined(XP_BEOS)
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#include <unistd.h>
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#elif defined(XP_WIN)
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#include <windows.h>
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#elif defined(XP_OS2)
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#define INCL_DOSERRORS
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#include <os2.h>
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#else
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// XXX add necessary include file for ftruncate (or equivalent)
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#endif
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#include "prtypes.h"
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#include "prthread.h"
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#include "prbit.h"
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#include "private/pprio.h"
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#include "nsDiskCacheDevice.h"
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#include "nsDiskCacheEntry.h"
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#include "nsDiskCacheMap.h"
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#include "nsDiskCacheStreams.h"
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#include "nsDiskCache.h"
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#include "nsCacheService.h"
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#include "nsCache.h"
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#include "nsDeleteDir.h"
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#include "nsICacheVisitor.h"
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#include "nsReadableUtils.h"
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#include "nsIInputStream.h"
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#include "nsIOutputStream.h"
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#include "nsAutoLock.h"
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#include "nsCRT.h"
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#include "nsCOMArray.h"
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#include "nsISimpleEnumerator.h"
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#include "mozilla/FunctionTimer.h"
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static const char DISK_CACHE_DEVICE_ID[] = { "disk" };
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/******************************************************************************
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* nsDiskCacheEvictor
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*
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* Helper class for nsDiskCacheDevice.
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*
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*****************************************************************************/
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class nsDiskCacheEvictor : public nsDiskCacheRecordVisitor
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{
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public:
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nsDiskCacheEvictor( nsDiskCacheMap * cacheMap,
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nsDiskCacheBindery * cacheBindery,
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PRUint32 targetSize,
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const char * clientID)
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: mCacheMap(cacheMap)
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, mBindery(cacheBindery)
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, mTargetSize(targetSize)
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, mClientID(clientID)
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{
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mClientIDSize = clientID ? strlen(clientID) : 0;
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}
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virtual PRInt32 VisitRecord(nsDiskCacheRecord * mapRecord);
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private:
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nsDiskCacheMap * mCacheMap;
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nsDiskCacheBindery * mBindery;
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PRUint32 mTargetSize;
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const char * mClientID;
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PRUint32 mClientIDSize;
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};
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PRInt32
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nsDiskCacheEvictor::VisitRecord(nsDiskCacheRecord * mapRecord)
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{
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if (mCacheMap->TotalSize() < mTargetSize)
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return kStopVisitingRecords;
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if (mClientID) {
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// we're just evicting records for a specific client
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nsDiskCacheEntry * diskEntry = mCacheMap->ReadDiskCacheEntry(mapRecord);
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if (!diskEntry)
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return kVisitNextRecord; // XXX or delete record?
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// Compare clientID's without malloc
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if ((diskEntry->mKeySize <= mClientIDSize) ||
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(diskEntry->Key()[mClientIDSize] != ':') ||
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(memcmp(diskEntry->Key(), mClientID, mClientIDSize) != 0)) {
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return kVisitNextRecord; // clientID doesn't match, skip it
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}
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}
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nsDiskCacheBinding * binding = mBindery->FindActiveBinding(mapRecord->HashNumber());
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if (binding) {
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// We are currently using this entry, so all we can do is doom it.
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// Since we're enumerating the records, we don't want to call
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// DeleteRecord when nsCacheService::DoomEntry() calls us back.
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binding->mDoomed = PR_TRUE; // mark binding record as 'deleted'
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nsCacheService::DoomEntry(binding->mCacheEntry);
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} else {
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// entry not in use, just delete storage because we're enumerating the records
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(void) mCacheMap->DeleteStorage(mapRecord);
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}
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return kDeleteRecordAndContinue; // this will REALLY delete the record
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}
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/******************************************************************************
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* nsDiskCacheDeviceInfo
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*****************************************************************************/
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class nsDiskCacheDeviceInfo : public nsICacheDeviceInfo {
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSICACHEDEVICEINFO
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nsDiskCacheDeviceInfo(nsDiskCacheDevice* device)
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: mDevice(device)
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{
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}
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virtual ~nsDiskCacheDeviceInfo() {}
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private:
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nsDiskCacheDevice* mDevice;
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};
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NS_IMPL_ISUPPORTS1(nsDiskCacheDeviceInfo, nsICacheDeviceInfo)
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/* readonly attribute string description; */
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NS_IMETHODIMP nsDiskCacheDeviceInfo::GetDescription(char ** aDescription)
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{
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NS_ENSURE_ARG_POINTER(aDescription);
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*aDescription = NS_strdup("Disk cache device");
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return *aDescription ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
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}
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/* readonly attribute string usageReport; */
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NS_IMETHODIMP nsDiskCacheDeviceInfo::GetUsageReport(char ** usageReport)
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{
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NS_ENSURE_ARG_POINTER(usageReport);
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nsCString buffer;
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buffer.AssignLiteral(" <tr>\n"
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" <th>Cache Directory:</th>\n"
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" <td>");
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nsCOMPtr<nsILocalFile> cacheDir;
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nsAutoString path;
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mDevice->getCacheDirectory(getter_AddRefs(cacheDir));
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nsresult rv = cacheDir->GetPath(path);
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if (NS_SUCCEEDED(rv)) {
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AppendUTF16toUTF8(path, buffer);
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} else {
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buffer.AppendLiteral("directory unavailable");
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}
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buffer.AppendLiteral("</td>\n"
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" </tr>\n");
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*usageReport = ToNewCString(buffer);
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if (!*usageReport) return NS_ERROR_OUT_OF_MEMORY;
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return NS_OK;
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}
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/* readonly attribute unsigned long entryCount; */
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NS_IMETHODIMP nsDiskCacheDeviceInfo::GetEntryCount(PRUint32 *aEntryCount)
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{
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NS_ENSURE_ARG_POINTER(aEntryCount);
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*aEntryCount = mDevice->getEntryCount();
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return NS_OK;
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}
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/* readonly attribute unsigned long totalSize; */
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NS_IMETHODIMP nsDiskCacheDeviceInfo::GetTotalSize(PRUint32 *aTotalSize)
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{
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NS_ENSURE_ARG_POINTER(aTotalSize);
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// Returned unit's are in bytes
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*aTotalSize = mDevice->getCacheSize() * 1024;
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return NS_OK;
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}
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/* readonly attribute unsigned long maximumSize; */
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NS_IMETHODIMP nsDiskCacheDeviceInfo::GetMaximumSize(PRUint32 *aMaximumSize)
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{
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NS_ENSURE_ARG_POINTER(aMaximumSize);
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// Returned unit's are in bytes
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*aMaximumSize = mDevice->getCacheCapacity() * 1024;
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return NS_OK;
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}
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/******************************************************************************
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* nsDiskCache
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*****************************************************************************/
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/**
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* nsDiskCache::Hash(const char * key, PLDHashNumber initval)
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*
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* See http://burtleburtle.net/bob/hash/evahash.html for more information
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* about this hash function.
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*
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* This algorithm of this method implies nsDiskCacheRecords will be stored
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* in a certain order on disk. If the algorithm changes, existing cache
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* map files may become invalid, and therefore the kCurrentVersion needs
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* to be revised.
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*/
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static inline void hashmix(PRUint32& a, PRUint32& b, PRUint32& c)
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{
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a -= b; a -= c; a ^= (c>>13);
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b -= c; b -= a; b ^= (a<<8);
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c -= a; c -= b; c ^= (b>>13);
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a -= b; a -= c; a ^= (c>>12);
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b -= c; b -= a; b ^= (a<<16);
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c -= a; c -= b; c ^= (b>>5);
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a -= b; a -= c; a ^= (c>>3);
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b -= c; b -= a; b ^= (a<<10);
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c -= a; c -= b; c ^= (b>>15);
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}
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PLDHashNumber
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nsDiskCache::Hash(const char * key, PLDHashNumber initval)
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{
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const PRUint8 *k = reinterpret_cast<const PRUint8*>(key);
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PRUint32 a, b, c, len, length;
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length = PL_strlen(key);
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/* Set up the internal state */
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len = length;
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a = b = 0x9e3779b9; /* the golden ratio; an arbitrary value */
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c = initval; /* variable initialization of internal state */
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/*---------------------------------------- handle most of the key */
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while (len >= 12)
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{
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a += k[0] + (PRUint32(k[1])<<8) + (PRUint32(k[2])<<16) + (PRUint32(k[3])<<24);
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b += k[4] + (PRUint32(k[5])<<8) + (PRUint32(k[6])<<16) + (PRUint32(k[7])<<24);
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c += k[8] + (PRUint32(k[9])<<8) + (PRUint32(k[10])<<16) + (PRUint32(k[11])<<24);
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hashmix(a, b, c);
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k += 12; len -= 12;
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}
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/*------------------------------------- handle the last 11 bytes */
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c += length;
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switch(len) { /* all the case statements fall through */
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case 11: c += (PRUint32(k[10])<<24);
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case 10: c += (PRUint32(k[9])<<16);
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case 9 : c += (PRUint32(k[8])<<8);
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/* the low-order byte of c is reserved for the length */
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case 8 : b += (PRUint32(k[7])<<24);
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case 7 : b += (PRUint32(k[6])<<16);
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case 6 : b += (PRUint32(k[5])<<8);
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case 5 : b += k[4];
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case 4 : a += (PRUint32(k[3])<<24);
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case 3 : a += (PRUint32(k[2])<<16);
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case 2 : a += (PRUint32(k[1])<<8);
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case 1 : a += k[0];
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/* case 0: nothing left to add */
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}
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hashmix(a, b, c);
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return c;
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}
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nsresult
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nsDiskCache::Truncate(PRFileDesc * fd, PRUint32 newEOF)
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{
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// use modified SetEOF from nsFileStreams::SetEOF()
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#if defined(XP_UNIX) || defined(XP_BEOS)
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if (ftruncate(PR_FileDesc2NativeHandle(fd), newEOF) != 0) {
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NS_ERROR("ftruncate failed");
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return NS_ERROR_FAILURE;
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}
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#elif defined(XP_WIN)
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PRInt32 cnt = PR_Seek(fd, newEOF, PR_SEEK_SET);
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if (cnt == -1) return NS_ERROR_FAILURE;
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if (!SetEndOfFile((HANDLE) PR_FileDesc2NativeHandle(fd))) {
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NS_ERROR("SetEndOfFile failed");
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return NS_ERROR_FAILURE;
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}
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#elif defined(XP_OS2)
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if (DosSetFileSize((HFILE) PR_FileDesc2NativeHandle(fd), newEOF) != NO_ERROR) {
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NS_ERROR("DosSetFileSize failed");
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return NS_ERROR_FAILURE;
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}
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#else
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// add implementations for other platforms here
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#endif
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return NS_OK;
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}
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/******************************************************************************
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* nsDiskCacheDevice
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*****************************************************************************/
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nsDiskCacheDevice::nsDiskCacheDevice()
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: mCacheCapacity(0)
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, mInitialized(PR_FALSE)
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{
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}
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nsDiskCacheDevice::~nsDiskCacheDevice()
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{
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Shutdown();
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}
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/**
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* methods of nsCacheDevice
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*/
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nsresult
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nsDiskCacheDevice::Init()
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{
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NS_TIME_FUNCTION;
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nsresult rv;
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if (Initialized()) {
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NS_ERROR("Disk cache already initialized!");
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return NS_ERROR_UNEXPECTED;
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}
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if (!mCacheDirectory)
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return NS_ERROR_FAILURE;
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rv = mBindery.Init();
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if (NS_FAILED(rv))
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return rv;
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// Open Disk Cache
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rv = OpenDiskCache();
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if (NS_FAILED(rv)) {
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(void) mCacheMap.Close(PR_FALSE);
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return rv;
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}
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mInitialized = PR_TRUE;
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return NS_OK;
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}
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/**
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* NOTE: called while holding the cache service lock
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*/
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nsresult
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nsDiskCacheDevice::Shutdown()
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{
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nsresult rv = Shutdown_Private(PR_TRUE);
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if (NS_FAILED(rv))
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return rv;
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if (mCacheDirectory) {
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// delete any trash files left-over before shutting down.
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nsCOMPtr<nsIFile> trashDir;
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GetTrashDir(mCacheDirectory, &trashDir);
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if (trashDir) {
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PRBool exists;
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if (NS_SUCCEEDED(trashDir->Exists(&exists)) && exists)
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DeleteDir(trashDir, PR_FALSE, PR_TRUE);
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}
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}
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return NS_OK;
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}
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nsresult
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nsDiskCacheDevice::Shutdown_Private(PRBool flush)
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{
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CACHE_LOG_DEBUG(("CACHE: disk Shutdown_Private [%u]\n", flush));
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if (Initialized()) {
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// check cache limits in case we need to evict.
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EvictDiskCacheEntries(mCacheCapacity);
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// write out persistent information about the cache.
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(void) mCacheMap.Close(flush);
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mBindery.Reset();
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mInitialized = PR_FALSE;
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}
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return NS_OK;
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}
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const char *
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nsDiskCacheDevice::GetDeviceID()
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{
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return DISK_CACHE_DEVICE_ID;
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}
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/**
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* FindEntry -
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*
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* cases: key not in disk cache, hash number free
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* key not in disk cache, hash number used
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* key in disk cache
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*
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* NOTE: called while holding the cache service lock
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*/
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nsCacheEntry *
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nsDiskCacheDevice::FindEntry(nsCString * key, PRBool *collision)
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{
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if (!Initialized()) return nsnull; // NS_ERROR_NOT_INITIALIZED
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nsDiskCacheRecord record;
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nsDiskCacheBinding * binding = nsnull;
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PLDHashNumber hashNumber = nsDiskCache::Hash(key->get());
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*collision = PR_FALSE;
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binding = mBindery.FindActiveBinding(hashNumber);
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if (binding && !binding->mCacheEntry->Key()->Equals(*key)) {
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*collision = PR_TRUE;
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return nsnull;
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}
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binding = nsnull;
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// lookup hash number in cache map
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nsresult rv = mCacheMap.FindRecord(hashNumber, &record);
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if (NS_FAILED(rv)) return nsnull; // XXX log error?
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nsDiskCacheEntry * diskEntry = mCacheMap.ReadDiskCacheEntry(&record);
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if (!diskEntry) return nsnull;
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// compare key to be sure
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if (!key->Equals(diskEntry->Key())) {
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*collision = PR_TRUE;
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return nsnull;
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}
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nsCacheEntry * entry = diskEntry->CreateCacheEntry(this);
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if (!entry) return nsnull;
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binding = mBindery.CreateBinding(entry, &record);
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if (!binding) {
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delete entry;
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return nsnull;
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}
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return entry;
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}
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/**
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* NOTE: called while holding the cache service lock
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*/
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nsresult
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nsDiskCacheDevice::DeactivateEntry(nsCacheEntry * entry)
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{
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nsresult rv = NS_OK;
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nsDiskCacheBinding * binding = GetCacheEntryBinding(entry);
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NS_ASSERTION(binding, "DeactivateEntry: binding == nsnull");
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if (!binding) return NS_ERROR_UNEXPECTED;
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CACHE_LOG_DEBUG(("CACHE: disk DeactivateEntry [%p %x]\n",
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entry, binding->mRecord.HashNumber()));
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if (entry->IsDoomed()) {
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// delete data, entry, record from disk for entry
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rv = mCacheMap.DeleteStorage(&binding->mRecord);
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} else {
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// save stuff to disk for entry
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rv = mCacheMap.WriteDiskCacheEntry(binding);
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if (NS_FAILED(rv)) {
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// clean up as best we can
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(void) mCacheMap.DeleteStorage(&binding->mRecord);
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(void) mCacheMap.DeleteRecord(&binding->mRecord);
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binding->mDoomed = PR_TRUE; // record is no longer in cache map
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}
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}
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mBindery.RemoveBinding(binding); // extract binding from collision detection stuff
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delete entry; // which will release binding
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return rv;
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}
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/**
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* BindEntry()
|
|
* no hash number collision -> no problem
|
|
* collision
|
|
* record not active -> evict, no problem
|
|
* record is active
|
|
* record is already doomed -> record shouldn't have been in map, no problem
|
|
* record is not doomed -> doom, and replace record in map
|
|
*
|
|
* walk matching hashnumber list to find lowest generation number
|
|
* take generation number from other (data/meta) location,
|
|
* or walk active list
|
|
*
|
|
* NOTE: called while holding the cache service lock
|
|
*/
|
|
nsresult
|
|
nsDiskCacheDevice::BindEntry(nsCacheEntry * entry)
|
|
{
|
|
if (!Initialized()) return NS_ERROR_NOT_INITIALIZED;
|
|
nsresult rv = NS_OK;
|
|
nsDiskCacheRecord record, oldRecord;
|
|
nsDiskCacheBinding *binding;
|
|
PLDHashNumber hashNumber = nsDiskCache::Hash(entry->Key()->get());
|
|
|
|
// Find out if there is already an active binding for this hash. If yes it
|
|
// should have another key since BindEntry() shouldn't be called twice for
|
|
// the same entry. Doom the old entry, the new one will get another
|
|
// generation number so files won't collide.
|
|
binding = mBindery.FindActiveBinding(hashNumber);
|
|
if (binding) {
|
|
NS_ASSERTION(!binding->mCacheEntry->Key()->Equals(*entry->Key()),
|
|
"BindEntry called for already bound entry!");
|
|
nsCacheService::DoomEntry(binding->mCacheEntry);
|
|
binding = nsnull;
|
|
}
|
|
|
|
// Lookup hash number in cache map. There can be a colliding inactive entry.
|
|
// See bug #321361 comment 21 for the scenario. If there is such entry,
|
|
// delete it.
|
|
rv = mCacheMap.FindRecord(hashNumber, &record);
|
|
if (NS_SUCCEEDED(rv)) {
|
|
nsDiskCacheEntry * diskEntry = mCacheMap.ReadDiskCacheEntry(&record);
|
|
if (diskEntry) {
|
|
// compare key to be sure
|
|
if (!entry->Key()->Equals(diskEntry->Key())) {
|
|
mCacheMap.DeleteStorage(&record);
|
|
rv = mCacheMap.DeleteRecord(&record);
|
|
if (NS_FAILED(rv)) return rv;
|
|
}
|
|
}
|
|
record = nsDiskCacheRecord();
|
|
}
|
|
|
|
// create a new record for this entry
|
|
record.SetHashNumber(nsDiskCache::Hash(entry->Key()->get()));
|
|
record.SetEvictionRank(ULONG_MAX - SecondsFromPRTime(PR_Now()));
|
|
|
|
CACHE_LOG_DEBUG(("CACHE: disk BindEntry [%p %x]\n",
|
|
entry, record.HashNumber()));
|
|
|
|
if (!entry->IsDoomed()) {
|
|
// if entry isn't doomed, add it to the cache map
|
|
rv = mCacheMap.AddRecord(&record, &oldRecord); // deletes old record, if any
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
PRUint32 oldHashNumber = oldRecord.HashNumber();
|
|
if (oldHashNumber) {
|
|
// gotta evict this one first
|
|
nsDiskCacheBinding * oldBinding = mBindery.FindActiveBinding(oldHashNumber);
|
|
if (oldBinding) {
|
|
// XXX if debug : compare keys for hashNumber collision
|
|
|
|
if (!oldBinding->mCacheEntry->IsDoomed()) {
|
|
// we've got a live one!
|
|
nsCacheService::DoomEntry(oldBinding->mCacheEntry);
|
|
// storage will be delete when oldBinding->mCacheEntry is Deactivated
|
|
}
|
|
} else {
|
|
// delete storage
|
|
// XXX if debug : compare keys for hashNumber collision
|
|
rv = mCacheMap.DeleteStorage(&oldRecord);
|
|
if (NS_FAILED(rv)) return rv; // XXX delete record we just added?
|
|
}
|
|
}
|
|
}
|
|
|
|
// Make sure this entry has its associated nsDiskCacheBinding attached.
|
|
binding = mBindery.CreateBinding(entry, &record);
|
|
NS_ASSERTION(binding, "nsDiskCacheDevice::BindEntry");
|
|
if (!binding) return NS_ERROR_OUT_OF_MEMORY;
|
|
NS_ASSERTION(binding->mRecord.ValidRecord(), "bad cache map record");
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
/**
|
|
* NOTE: called while holding the cache service lock
|
|
*/
|
|
void
|
|
nsDiskCacheDevice::DoomEntry(nsCacheEntry * entry)
|
|
{
|
|
CACHE_LOG_DEBUG(("CACHE: disk DoomEntry [%p]\n", entry));
|
|
|
|
nsDiskCacheBinding * binding = GetCacheEntryBinding(entry);
|
|
NS_ASSERTION(binding, "DoomEntry: binding == nsnull");
|
|
if (!binding) return;
|
|
|
|
if (!binding->mDoomed) {
|
|
// so it can't be seen by FindEntry() ever again.
|
|
#ifdef DEBUG
|
|
nsresult rv =
|
|
#endif
|
|
mCacheMap.DeleteRecord(&binding->mRecord);
|
|
NS_ASSERTION(NS_SUCCEEDED(rv),"DeleteRecord failed.");
|
|
binding->mDoomed = PR_TRUE; // record in no longer in cache map
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* NOTE: called while holding the cache service lock
|
|
*/
|
|
nsresult
|
|
nsDiskCacheDevice::OpenInputStreamForEntry(nsCacheEntry * entry,
|
|
nsCacheAccessMode mode,
|
|
PRUint32 offset,
|
|
nsIInputStream ** result)
|
|
{
|
|
CACHE_LOG_DEBUG(("CACHE: disk OpenInputStreamForEntry [%p %x %u]\n",
|
|
entry, mode, offset));
|
|
|
|
NS_ENSURE_ARG_POINTER(entry);
|
|
NS_ENSURE_ARG_POINTER(result);
|
|
|
|
nsresult rv;
|
|
nsDiskCacheBinding * binding = GetCacheEntryBinding(entry);
|
|
NS_ENSURE_TRUE(binding, NS_ERROR_UNEXPECTED);
|
|
|
|
NS_ASSERTION(binding->mCacheEntry == entry, "binding & entry don't point to each other");
|
|
|
|
rv = binding->EnsureStreamIO();
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
return binding->mStreamIO->GetInputStream(offset, result);
|
|
}
|
|
|
|
|
|
/**
|
|
* NOTE: called while holding the cache service lock
|
|
*/
|
|
nsresult
|
|
nsDiskCacheDevice::OpenOutputStreamForEntry(nsCacheEntry * entry,
|
|
nsCacheAccessMode mode,
|
|
PRUint32 offset,
|
|
nsIOutputStream ** result)
|
|
{
|
|
CACHE_LOG_DEBUG(("CACHE: disk OpenOutputStreamForEntry [%p %x %u]\n",
|
|
entry, mode, offset));
|
|
|
|
NS_ENSURE_ARG_POINTER(entry);
|
|
NS_ENSURE_ARG_POINTER(result);
|
|
|
|
nsresult rv;
|
|
nsDiskCacheBinding * binding = GetCacheEntryBinding(entry);
|
|
NS_ENSURE_TRUE(binding, NS_ERROR_UNEXPECTED);
|
|
|
|
NS_ASSERTION(binding->mCacheEntry == entry, "binding & entry don't point to each other");
|
|
|
|
rv = binding->EnsureStreamIO();
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
return binding->mStreamIO->GetOutputStream(offset, result);
|
|
}
|
|
|
|
|
|
/**
|
|
* NOTE: called while holding the cache service lock
|
|
*/
|
|
nsresult
|
|
nsDiskCacheDevice::GetFileForEntry(nsCacheEntry * entry,
|
|
nsIFile ** result)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(result);
|
|
*result = nsnull;
|
|
|
|
nsresult rv;
|
|
|
|
nsDiskCacheBinding * binding = GetCacheEntryBinding(entry);
|
|
if (!binding) {
|
|
NS_WARNING("GetFileForEntry: binding == nsnull");
|
|
return NS_ERROR_UNEXPECTED;
|
|
}
|
|
|
|
// check/set binding->mRecord for separate file, sync w/mCacheMap
|
|
if (binding->mRecord.DataLocationInitialized()) {
|
|
if (binding->mRecord.DataFile() != 0)
|
|
return NS_ERROR_NOT_AVAILABLE; // data not stored as separate file
|
|
|
|
NS_ASSERTION(binding->mRecord.DataFileGeneration() == binding->mGeneration, "error generations out of sync");
|
|
} else {
|
|
binding->mRecord.SetDataFileGeneration(binding->mGeneration);
|
|
binding->mRecord.SetDataFileSize(0); // 1k minimum
|
|
if (!binding->mDoomed) {
|
|
// record stored in cache map, so update it
|
|
rv = mCacheMap.UpdateRecord(&binding->mRecord);
|
|
if (NS_FAILED(rv)) return rv;
|
|
}
|
|
}
|
|
|
|
nsCOMPtr<nsIFile> file;
|
|
rv = mCacheMap.GetFileForDiskCacheRecord(&binding->mRecord,
|
|
nsDiskCache::kData,
|
|
PR_FALSE,
|
|
getter_AddRefs(file));
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
NS_IF_ADDREF(*result = file);
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
/**
|
|
* This routine will get called every time an open descriptor is written to.
|
|
*
|
|
* NOTE: called while holding the cache service lock
|
|
*/
|
|
nsresult
|
|
nsDiskCacheDevice::OnDataSizeChange(nsCacheEntry * entry, PRInt32 deltaSize)
|
|
{
|
|
CACHE_LOG_DEBUG(("CACHE: disk OnDataSizeChange [%p %d]\n",
|
|
entry, deltaSize));
|
|
|
|
// If passed a negative value, then there's nothing to do.
|
|
if (deltaSize < 0)
|
|
return NS_OK;
|
|
|
|
nsDiskCacheBinding * binding = GetCacheEntryBinding(entry);
|
|
NS_ASSERTION(binding, "OnDataSizeChange: binding == nsnull");
|
|
if (!binding) return NS_ERROR_UNEXPECTED;
|
|
|
|
NS_ASSERTION(binding->mRecord.ValidRecord(), "bad record");
|
|
|
|
PRUint32 newSize = entry->DataSize() + deltaSize;
|
|
PRUint32 newSizeK = ((newSize + 0x3FF) >> 10);
|
|
|
|
// If the new size is larger than max. file size or larger than
|
|
// 1/8 the cache capacity (which is in KiB's), doom the entry and abort
|
|
if (EntryIsTooBig(newSize)) {
|
|
#ifdef DEBUG
|
|
nsresult rv =
|
|
#endif
|
|
nsCacheService::DoomEntry(entry);
|
|
NS_ASSERTION(NS_SUCCEEDED(rv),"DoomEntry() failed.");
|
|
return NS_ERROR_ABORT;
|
|
}
|
|
|
|
PRUint32 sizeK = ((entry->DataSize() + 0x03FF) >> 10); // round up to next 1k
|
|
|
|
NS_ASSERTION(sizeK <= USHRT_MAX, "data size out of range");
|
|
NS_ASSERTION(newSizeK <= USHRT_MAX, "data size out of range");
|
|
|
|
// pre-evict entries to make space for new data
|
|
PRUint32 targetCapacity = mCacheCapacity > (newSizeK - sizeK)
|
|
? mCacheCapacity - (newSizeK - sizeK)
|
|
: 0;
|
|
EvictDiskCacheEntries(targetCapacity);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
/******************************************************************************
|
|
* EntryInfoVisitor
|
|
*****************************************************************************/
|
|
class EntryInfoVisitor : public nsDiskCacheRecordVisitor
|
|
{
|
|
public:
|
|
EntryInfoVisitor(nsDiskCacheMap * cacheMap,
|
|
nsICacheVisitor * visitor)
|
|
: mCacheMap(cacheMap)
|
|
, mVisitor(visitor)
|
|
{}
|
|
|
|
virtual PRInt32 VisitRecord(nsDiskCacheRecord * mapRecord)
|
|
{
|
|
// XXX optimization: do we have this record in memory?
|
|
|
|
// read in the entry (metadata)
|
|
nsDiskCacheEntry * diskEntry = mCacheMap->ReadDiskCacheEntry(mapRecord);
|
|
if (!diskEntry) {
|
|
return kVisitNextRecord;
|
|
}
|
|
|
|
// create nsICacheEntryInfo
|
|
nsDiskCacheEntryInfo * entryInfo = new nsDiskCacheEntryInfo(DISK_CACHE_DEVICE_ID, diskEntry);
|
|
if (!entryInfo) {
|
|
return kStopVisitingRecords;
|
|
}
|
|
nsCOMPtr<nsICacheEntryInfo> ref(entryInfo);
|
|
|
|
PRBool keepGoing;
|
|
(void)mVisitor->VisitEntry(DISK_CACHE_DEVICE_ID, entryInfo, &keepGoing);
|
|
return keepGoing ? kVisitNextRecord : kStopVisitingRecords;
|
|
}
|
|
|
|
private:
|
|
nsDiskCacheMap * mCacheMap;
|
|
nsICacheVisitor * mVisitor;
|
|
};
|
|
|
|
|
|
nsresult
|
|
nsDiskCacheDevice::Visit(nsICacheVisitor * visitor)
|
|
{
|
|
if (!Initialized()) return NS_ERROR_NOT_INITIALIZED;
|
|
nsDiskCacheDeviceInfo* deviceInfo = new nsDiskCacheDeviceInfo(this);
|
|
nsCOMPtr<nsICacheDeviceInfo> ref(deviceInfo);
|
|
|
|
PRBool keepGoing;
|
|
nsresult rv = visitor->VisitDevice(DISK_CACHE_DEVICE_ID, deviceInfo, &keepGoing);
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
if (keepGoing) {
|
|
EntryInfoVisitor infoVisitor(&mCacheMap, visitor);
|
|
return mCacheMap.VisitRecords(&infoVisitor);
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
// Max allowed size for an entry is currently MIN(5MB, 1/8 CacheCapacity)
|
|
bool
|
|
nsDiskCacheDevice::EntryIsTooBig(PRInt64 entrySize)
|
|
{
|
|
return entrySize > kMaxDataFileSize
|
|
|| entrySize > (static_cast<PRInt64>(mCacheCapacity) * 1024 / 8);
|
|
}
|
|
|
|
nsresult
|
|
nsDiskCacheDevice::EvictEntries(const char * clientID)
|
|
{
|
|
CACHE_LOG_DEBUG(("CACHE: disk EvictEntries [%s]\n", clientID));
|
|
|
|
if (!Initialized()) return NS_ERROR_NOT_INITIALIZED;
|
|
nsresult rv;
|
|
|
|
if (clientID == nsnull) {
|
|
// we're clearing the entire disk cache
|
|
rv = ClearDiskCache();
|
|
if (rv != NS_ERROR_CACHE_IN_USE)
|
|
return rv;
|
|
}
|
|
|
|
nsDiskCacheEvictor evictor(&mCacheMap, &mBindery, 0, clientID);
|
|
rv = mCacheMap.VisitRecords(&evictor);
|
|
|
|
if (clientID == nsnull) // we tried to clear the entire cache
|
|
rv = mCacheMap.Trim(); // so trim cache block files (if possible)
|
|
return rv;
|
|
}
|
|
|
|
|
|
/**
|
|
* private methods
|
|
*/
|
|
|
|
nsresult
|
|
nsDiskCacheDevice::OpenDiskCache()
|
|
{
|
|
// if we don't have a cache directory, create one and open it
|
|
PRBool exists;
|
|
nsresult rv = mCacheDirectory->Exists(&exists);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
|
|
PRBool trashing = PR_FALSE;
|
|
if (exists) {
|
|
// Try opening cache map file.
|
|
rv = mCacheMap.Open(mCacheDirectory);
|
|
// move "corrupt" caches to trash
|
|
if (rv == NS_ERROR_FILE_CORRUPTED) {
|
|
rv = DeleteDir(mCacheDirectory, PR_TRUE, PR_FALSE);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
exists = PR_FALSE;
|
|
trashing = PR_TRUE;
|
|
}
|
|
else if (NS_FAILED(rv))
|
|
return rv;
|
|
}
|
|
|
|
// if we don't have a cache directory, create one and open it
|
|
if (!exists) {
|
|
rv = mCacheDirectory->Create(nsIFile::DIRECTORY_TYPE, 0777);
|
|
CACHE_LOG_PATH(PR_LOG_ALWAYS, "\ncreate cache directory: %s\n", mCacheDirectory);
|
|
CACHE_LOG_ALWAYS(("mCacheDirectory->Create() = %x\n", rv));
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
|
|
// reopen the cache map
|
|
rv = mCacheMap.Open(mCacheDirectory);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
}
|
|
|
|
if (!trashing) {
|
|
// delete any trash files leftover from a previous run
|
|
nsCOMPtr<nsIFile> trashDir;
|
|
GetTrashDir(mCacheDirectory, &trashDir);
|
|
if (trashDir) {
|
|
PRBool exists;
|
|
if (NS_SUCCEEDED(trashDir->Exists(&exists)) && exists)
|
|
DeleteDir(trashDir, PR_FALSE, PR_FALSE);
|
|
}
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
nsresult
|
|
nsDiskCacheDevice::ClearDiskCache()
|
|
{
|
|
if (mBindery.ActiveBindings())
|
|
return NS_ERROR_CACHE_IN_USE;
|
|
|
|
nsresult rv = Shutdown_Private(PR_FALSE); // false: don't bother flushing
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
|
|
// If the disk cache directory is already gone, then it's not an error if
|
|
// we fail to delete it ;-)
|
|
rv = DeleteDir(mCacheDirectory, PR_TRUE, PR_FALSE);
|
|
if (NS_FAILED(rv) && rv != NS_ERROR_FILE_TARGET_DOES_NOT_EXIST)
|
|
return rv;
|
|
|
|
return Init();
|
|
}
|
|
|
|
|
|
nsresult
|
|
nsDiskCacheDevice::EvictDiskCacheEntries(PRUint32 targetCapacity)
|
|
{
|
|
CACHE_LOG_DEBUG(("CACHE: disk EvictDiskCacheEntries [%u]\n",
|
|
targetCapacity));
|
|
|
|
NS_ASSERTION(targetCapacity > 0, "oops");
|
|
|
|
if (mCacheMap.TotalSize() < targetCapacity)
|
|
return NS_OK;
|
|
|
|
// targetCapacity is in KiB's
|
|
nsDiskCacheEvictor evictor(&mCacheMap, &mBindery, targetCapacity, nsnull);
|
|
return mCacheMap.EvictRecords(&evictor);
|
|
}
|
|
|
|
|
|
/**
|
|
* methods for prefs
|
|
*/
|
|
|
|
void
|
|
nsDiskCacheDevice::SetCacheParentDirectory(nsILocalFile * parentDir)
|
|
{
|
|
nsresult rv;
|
|
PRBool exists;
|
|
|
|
if (Initialized()) {
|
|
NS_ASSERTION(PR_FALSE, "Cannot switch cache directory when initialized");
|
|
return;
|
|
}
|
|
|
|
if (!parentDir) {
|
|
mCacheDirectory = nsnull;
|
|
return;
|
|
}
|
|
|
|
// ensure parent directory exists
|
|
rv = parentDir->Exists(&exists);
|
|
if (NS_SUCCEEDED(rv) && !exists)
|
|
rv = parentDir->Create(nsIFile::DIRECTORY_TYPE, 0700);
|
|
if (NS_FAILED(rv)) return;
|
|
|
|
// ensure cache directory exists
|
|
nsCOMPtr<nsIFile> directory;
|
|
|
|
rv = parentDir->Clone(getter_AddRefs(directory));
|
|
if (NS_FAILED(rv)) return;
|
|
rv = directory->AppendNative(NS_LITERAL_CSTRING("Cache"));
|
|
if (NS_FAILED(rv)) return;
|
|
|
|
mCacheDirectory = do_QueryInterface(directory);
|
|
}
|
|
|
|
|
|
void
|
|
nsDiskCacheDevice::getCacheDirectory(nsILocalFile ** result)
|
|
{
|
|
*result = mCacheDirectory;
|
|
NS_IF_ADDREF(*result);
|
|
}
|
|
|
|
|
|
/**
|
|
* NOTE: called while holding the cache service lock
|
|
*/
|
|
void
|
|
nsDiskCacheDevice::SetCapacity(PRUint32 capacity)
|
|
{
|
|
// Units are KiB's
|
|
mCacheCapacity = capacity;
|
|
if (Initialized()) {
|
|
// start evicting entries if the new size is smaller!
|
|
EvictDiskCacheEntries(mCacheCapacity);
|
|
}
|
|
// Let cache map know of the new capacity
|
|
mCacheMap.NotifyCapacityChange(capacity);
|
|
}
|
|
|
|
|
|
PRUint32 nsDiskCacheDevice::getCacheCapacity()
|
|
{
|
|
return mCacheCapacity;
|
|
}
|
|
|
|
|
|
PRUint32 nsDiskCacheDevice::getCacheSize()
|
|
{
|
|
return mCacheMap.TotalSize();
|
|
}
|
|
|
|
|
|
PRUint32 nsDiskCacheDevice::getEntryCount()
|
|
{
|
|
return mCacheMap.EntryCount();
|
|
}
|