pjs/netwerk/cache/nsCacheEntryDescriptor.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is nsCacheEntryDescriptor.cpp, released
* February 22, 2001.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Gordon Sheridan, 22-February-2001
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsICache.h"
#include "nsCache.h"
#include "nsCacheService.h"
#include "nsCacheEntryDescriptor.h"
#include "nsCacheEntry.h"
#include "nsReadableUtils.h"
#include "nsIOutputStream.h"
#include "nsCRT.h"
NS_IMPL_THREADSAFE_ISUPPORTS2(nsCacheEntryDescriptor,
nsICacheEntryDescriptor,
nsICacheEntryInfo)
nsCacheEntryDescriptor::nsCacheEntryDescriptor(nsCacheEntry * entry,
nsCacheAccessMode accessGranted)
: mCacheEntry(entry),
mAccessGranted(accessGranted)
{
PR_INIT_CLIST(this);
NS_ADDREF(nsCacheService::GlobalInstance()); // ensure it lives for the lifetime of the descriptor
}
nsCacheEntryDescriptor::~nsCacheEntryDescriptor()
{
// No need to close if the cache entry has already been severed. This
// helps avoid a shutdown assertion (bug 285519) that is caused when
// consumers end up holding onto these objects past xpcom-shutdown. It's
// okay for them to do that because the cache service calls our Close
// method during xpcom-shutdown, so we don't need to complain about it.
if (mCacheEntry)
Close();
nsCacheService * service = nsCacheService::GlobalInstance();
NS_RELEASE(service);
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetClientID(char ** result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
return ClientIDFromCacheKey(*(mCacheEntry->Key()), result);
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetDeviceID(char ** aDeviceID)
{
NS_ENSURE_ARG_POINTER(aDeviceID);
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
const char* deviceID = mCacheEntry->GetDeviceID();
if (!deviceID) {
*aDeviceID = nsnull;
return NS_OK;
}
*aDeviceID = NS_strdup(deviceID);
return *aDeviceID ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetKey(nsACString &result)
{
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
return ClientKeyFromCacheKey(*(mCacheEntry->Key()), result);
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetFetchCount(PRInt32 *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->FetchCount();
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetLastFetched(PRUint32 *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->LastFetched();
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetLastModified(PRUint32 *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->LastModified();
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetExpirationTime(PRUint32 *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->ExpirationTime();
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::SetExpirationTime(PRUint32 expirationTime)
{
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
mCacheEntry->SetExpirationTime(expirationTime);
mCacheEntry->MarkEntryDirty();
return NS_OK;
}
NS_IMETHODIMP nsCacheEntryDescriptor::IsStreamBased(PRBool *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->IsStreamData();
return NS_OK;
}
NS_IMETHODIMP nsCacheEntryDescriptor::GetPredictedDataSize(PRInt64 *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->PredictedDataSize();
return NS_OK;
}
NS_IMETHODIMP nsCacheEntryDescriptor::SetPredictedDataSize(PRInt64
predictedSize)
{
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
mCacheEntry->SetPredictedDataSize(predictedSize);
return NS_OK;
}
NS_IMETHODIMP nsCacheEntryDescriptor::GetDataSize(PRUint32 *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->DataSize();
return NS_OK;
}
nsresult
nsCacheEntryDescriptor::RequestDataSizeChange(PRInt32 deltaSize)
{
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
nsresult rv;
rv = nsCacheService::OnDataSizeChange(mCacheEntry, deltaSize);
if (NS_SUCCEEDED(rv)) {
// XXX review for signed/unsigned math errors
PRUint32 newDataSize = mCacheEntry->DataSize() + deltaSize;
mCacheEntry->SetDataSize(newDataSize);
mCacheEntry->TouchData();
}
return rv;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::SetDataSize(PRUint32 dataSize)
{
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
// XXX review for signed/unsigned math errors
PRInt32 deltaSize = dataSize - mCacheEntry->DataSize();
nsresult rv;
rv = nsCacheService::OnDataSizeChange(mCacheEntry, deltaSize);
// this had better be NS_OK, this call instance is advisory for memory cache objects
if (NS_SUCCEEDED(rv)) {
// XXX review for signed/unsigned math errors
PRUint32 newDataSize = mCacheEntry->DataSize() + deltaSize;
mCacheEntry->SetDataSize(newDataSize);
mCacheEntry->TouchData();
} else {
NS_WARNING("failed SetDataSize() on memory cache object!");
}
return rv;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::OpenInputStream(PRUint32 offset, nsIInputStream ** result)
{
NS_ENSURE_ARG_POINTER(result);
{
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
if (!mCacheEntry->IsStreamData()) return NS_ERROR_CACHE_DATA_IS_NOT_STREAM;
// ensure valid permissions
if (!(mAccessGranted & nsICache::ACCESS_READ))
return NS_ERROR_CACHE_READ_ACCESS_DENIED;
}
nsInputStreamWrapper* cacheInput =
new nsInputStreamWrapper(this, offset);
if (!cacheInput) return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*result = cacheInput);
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::OpenOutputStream(PRUint32 offset, nsIOutputStream ** result)
{
NS_ENSURE_ARG_POINTER(result);
{
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
if (!mCacheEntry->IsStreamData()) return NS_ERROR_CACHE_DATA_IS_NOT_STREAM;
// ensure valid permissions
if (!(mAccessGranted & nsICache::ACCESS_WRITE))
return NS_ERROR_CACHE_WRITE_ACCESS_DENIED;
}
nsOutputStreamWrapper* cacheOutput =
new nsOutputStreamWrapper(this, offset);
if (!cacheOutput) return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*result = cacheOutput);
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetCacheElement(nsISupports ** result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
if (mCacheEntry->IsStreamData()) return NS_ERROR_CACHE_DATA_IS_STREAM;
NS_IF_ADDREF(*result = mCacheEntry->Data());
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::SetCacheElement(nsISupports * cacheElement)
{
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
if (mCacheEntry->IsStreamData()) return NS_ERROR_CACHE_DATA_IS_STREAM;
return nsCacheService::SetCacheElement(mCacheEntry, cacheElement);
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetAccessGranted(nsCacheAccessMode *result)
{
NS_ENSURE_ARG_POINTER(result);
*result = mAccessGranted;
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetStoragePolicy(nsCacheStoragePolicy *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->StoragePolicy();
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::SetStoragePolicy(nsCacheStoragePolicy policy)
{
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
// XXX validate policy against session?
PRBool storageEnabled = PR_FALSE;
storageEnabled = nsCacheService::IsStorageEnabledForPolicy_Locked(policy);
if (!storageEnabled) return NS_ERROR_FAILURE;
// Don't change the storage policy of entries we can't write
if (!(mAccessGranted & nsICache::ACCESS_WRITE))
return NS_ERROR_NOT_AVAILABLE;
// Don't allow a cache entry to move from memory-only to anything else
if (mCacheEntry->StoragePolicy() == nsICache::STORE_IN_MEMORY &&
policy != nsICache::STORE_IN_MEMORY)
return NS_ERROR_NOT_AVAILABLE;
mCacheEntry->SetStoragePolicy(policy);
mCacheEntry->MarkEntryDirty();
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetFile(nsIFile ** result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
return nsCacheService::GetFileForEntry(mCacheEntry, result);
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetSecurityInfo(nsISupports ** result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->SecurityInfo();
NS_IF_ADDREF(*result);
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::SetSecurityInfo(nsISupports * securityInfo)
{
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
mCacheEntry->SetSecurityInfo(securityInfo);
mCacheEntry->MarkEntryDirty();
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::Doom()
{
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
return nsCacheService::DoomEntry(mCacheEntry);
}
NS_IMETHODIMP
nsCacheEntryDescriptor::DoomAndFailPendingRequests(nsresult status)
{
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::MarkValid()
{
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
nsresult rv = nsCacheService::ValidateEntry(mCacheEntry);
return rv;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::Close()
{
nsCacheServiceAutoLock lock;
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
// XXX perhaps closing descriptors should clear/sever transports
// tell nsCacheService we're going away
nsCacheService::CloseDescriptor(this);
NS_ASSERTION(mCacheEntry == nsnull, "mCacheEntry not null");
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetMetaDataElement(const char *key, char **result)
{
NS_ENSURE_ARG_POINTER(key);
*result = nsnull;
nsCacheServiceAutoLock lock;
NS_ENSURE_TRUE(mCacheEntry, NS_ERROR_NOT_AVAILABLE);
const char *value;
value = mCacheEntry->GetMetaDataElement(key);
if (!value) return NS_ERROR_NOT_AVAILABLE;
*result = NS_strdup(value);
if (!*result) return NS_ERROR_OUT_OF_MEMORY;
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::SetMetaDataElement(const char *key, const char *value)
{
NS_ENSURE_ARG_POINTER(key);
nsCacheServiceAutoLock lock;
NS_ENSURE_TRUE(mCacheEntry, NS_ERROR_NOT_AVAILABLE);
// XXX allow null value, for clearing key?
nsresult rv = mCacheEntry->SetMetaDataElement(key, value);
if (NS_SUCCEEDED(rv))
mCacheEntry->TouchMetaData();
return rv;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::VisitMetaData(nsICacheMetaDataVisitor * visitor)
{
nsCacheServiceAutoLock lock; // XXX check callers, we're calling out of module
NS_ENSURE_ARG_POINTER(visitor);
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
return mCacheEntry->VisitMetaDataElements(visitor);
}
/******************************************************************************
* nsCacheInputStream - a wrapper for nsIInputstream keeps the cache entry
* open while referenced.
******************************************************************************/
NS_IMPL_THREADSAFE_ISUPPORTS1(nsCacheEntryDescriptor::nsInputStreamWrapper,
nsIInputStream)
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::LazyInit()
{
nsCacheServiceAutoLock lock;
nsCacheAccessMode mode;
nsresult rv = mDescriptor->GetAccessGranted(&mode);
if (NS_FAILED(rv)) return rv;
NS_ENSURE_TRUE(mode & nsICache::ACCESS_READ, NS_ERROR_UNEXPECTED);
nsCacheEntry* cacheEntry = mDescriptor->CacheEntry();
if (!cacheEntry) return NS_ERROR_NOT_AVAILABLE;
rv = nsCacheService::OpenInputStreamForEntry(cacheEntry, mode,
mStartOffset,
getter_AddRefs(mInput));
if (NS_FAILED(rv)) return rv;
mInitialized = PR_TRUE;
return NS_OK;
}
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::Close()
{
nsresult rv = EnsureInit();
if (NS_FAILED(rv)) return rv;
return mInput->Close();
}
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::Available(PRUint32 *avail)
{
nsresult rv = EnsureInit();
if (NS_FAILED(rv)) return rv;
return mInput->Available(avail);
}
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::Read(char *buf, PRUint32 count, PRUint32 *countRead)
{
nsresult rv = EnsureInit();
if (NS_FAILED(rv)) return rv;
return mInput->Read(buf, count, countRead);
}
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::ReadSegments(nsWriteSegmentFun writer, void *closure,
PRUint32 count, PRUint32 *countRead)
{
// cache stream not buffered
return NS_ERROR_NOT_IMPLEMENTED;
}
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::IsNonBlocking(PRBool *result)
{
// cache streams will never return NS_BASE_STREAM_WOULD_BLOCK
*result = PR_FALSE;
return NS_OK;
}
/******************************************************************************
* nsCacheOutputStream - a wrapper for nsIOutputstream to track the amount of
* data written to a cache entry.
* - also keeps the cache entry open while referenced.
******************************************************************************/
NS_IMPL_THREADSAFE_ISUPPORTS1(nsCacheEntryDescriptor::nsOutputStreamWrapper,
nsIOutputStream)
nsresult nsCacheEntryDescriptor::
nsOutputStreamWrapper::LazyInit()
{
nsCacheServiceAutoLock lock;
nsCacheAccessMode mode;
nsresult rv = mDescriptor->GetAccessGranted(&mode);
if (NS_FAILED(rv)) return rv;
NS_ENSURE_TRUE(mode & nsICache::ACCESS_WRITE, NS_ERROR_UNEXPECTED);
nsCacheEntry* cacheEntry = mDescriptor->CacheEntry();
if (!cacheEntry) return NS_ERROR_NOT_AVAILABLE;
rv = nsCacheService::OpenOutputStreamForEntry(cacheEntry, mode, mStartOffset,
getter_AddRefs(mOutput));
if (NS_FAILED(rv)) return rv;
nsCacheDevice* device = cacheEntry->CacheDevice();
if (!device) return NS_ERROR_NOT_AVAILABLE;
// the entry has been truncated to mStartOffset bytes, inform the device.
PRInt32 size = cacheEntry->DataSize();
rv = device->OnDataSizeChange(cacheEntry, mStartOffset - size);
if (NS_FAILED(rv)) return rv;
cacheEntry->SetDataSize(mStartOffset);
mInitialized = PR_TRUE;
return NS_OK;
}
nsresult nsCacheEntryDescriptor::
nsOutputStreamWrapper::OnWrite(PRUint32 count)
{
if (count > PR_INT32_MAX) return NS_ERROR_UNEXPECTED;
return mDescriptor->RequestDataSizeChange((PRInt32)count);
}
NS_IMETHODIMP nsCacheEntryDescriptor::
nsOutputStreamWrapper::Close()
{
nsresult rv = EnsureInit();
if (NS_FAILED(rv)) return rv;
return mOutput->Close();
}
NS_IMETHODIMP nsCacheEntryDescriptor::
nsOutputStreamWrapper::Flush()
{
nsresult rv = EnsureInit();
if (NS_FAILED(rv)) return rv;
return mOutput->Flush();
}
NS_IMETHODIMP nsCacheEntryDescriptor::
nsOutputStreamWrapper::Write(const char * buf,
PRUint32 count,
PRUint32 * result)
{
nsresult rv = EnsureInit();
if (NS_FAILED(rv)) return rv;
rv = OnWrite(count);
if (NS_FAILED(rv)) return rv;
return mOutput->Write(buf, count, result);
}
NS_IMETHODIMP nsCacheEntryDescriptor::
nsOutputStreamWrapper::WriteFrom(nsIInputStream * inStr,
PRUint32 count,
PRUint32 * result)
{
NS_NOTREACHED("cache stream not buffered");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsCacheEntryDescriptor::
nsOutputStreamWrapper::WriteSegments(nsReadSegmentFun reader,
void * closure,
PRUint32 count,
PRUint32 * result)
{
NS_NOTREACHED("cache stream not buffered");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsCacheEntryDescriptor::
nsOutputStreamWrapper::IsNonBlocking(PRBool *result)
{
// cache streams will never return NS_BASE_STREAM_WOULD_BLOCK
*result = PR_FALSE;
return NS_OK;
}