mozilla
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gecko-dev
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gecko-dev/rdf/datasource/nsLocalStore.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set cindent tabstop=4 expandtab shiftwidth=4: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
Implementation for the local store
*/
#include "nsNetUtil.h"
#include "nsIFile.h"
#include "nsIURI.h"
#include "nsIIOService.h"
#include "nsIOutputStream.h"
#include "nsIComponentManager.h"
#include "nsILocalStore.h"
#include "nsIRDFDataSource.h"
#include "nsIRDFRemoteDataSource.h"
#include "nsIRDFService.h"
#include "nsIServiceManager.h"
#include "nsRDFCID.h"
#include "nsString.h"
#include "plstr.h"
#include "rdf.h"
#include "nsCOMPtr.h"
#include "nsWeakPtr.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsWeakReference.h"
#include "nsCRTGlue.h"
#include "nsCRT.h"
#include "nsEnumeratorUtils.h"
#include "nsCycleCollectionParticipant.h"
////////////////////////////////////////////////////////////////////////
class LocalStoreImpl : public nsILocalStore,
public nsIRDFDataSource,
public nsIRDFRemoteDataSource,
public nsIObserver,
public nsSupportsWeakReference
{
protected:
nsCOMPtr<nsIRDFDataSource> mInner;
LocalStoreImpl();
virtual ~LocalStoreImpl();
nsresult Init();
nsresult CreateLocalStore(nsIFile* aFile);
nsresult LoadData();
friend nsresult
NS_NewLocalStore(nsISupports* aOuter, REFNSIID aIID, void** aResult);
nsCOMPtr<nsIRDFService> mRDFService;
public:
// nsISupports interface
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(LocalStoreImpl, nsILocalStore)
// nsILocalStore interface
// nsIRDFDataSource interface. Most of these are just delegated to
// the inner, in-memory datasource.
NS_IMETHOD GetURI(nsACString& aURI) override;
NS_IMETHOD GetSource(nsIRDFResource* aProperty,
nsIRDFNode* aTarget,
bool aTruthValue,
nsIRDFResource** aSource) override {
return mInner->GetSource(aProperty, aTarget, aTruthValue, aSource);
}
NS_IMETHOD GetSources(nsIRDFResource* aProperty,
nsIRDFNode* aTarget,
bool aTruthValue,
nsISimpleEnumerator** aSources) override {
return mInner->GetSources(aProperty, aTarget, aTruthValue, aSources);
}
NS_IMETHOD GetTarget(nsIRDFResource* aSource,
nsIRDFResource* aProperty,
bool aTruthValue,
nsIRDFNode** aTarget) override {
return mInner->GetTarget(aSource, aProperty, aTruthValue, aTarget);
}
NS_IMETHOD GetTargets(nsIRDFResource* aSource,
nsIRDFResource* aProperty,
bool aTruthValue,
nsISimpleEnumerator** aTargets) override {
return mInner->GetTargets(aSource, aProperty, aTruthValue, aTargets);
}
NS_IMETHOD Assert(nsIRDFResource* aSource,
nsIRDFResource* aProperty,
nsIRDFNode* aTarget,
bool aTruthValue) override {
return mInner->Assert(aSource, aProperty, aTarget, aTruthValue);
}
NS_IMETHOD Unassert(nsIRDFResource* aSource,
nsIRDFResource* aProperty,
nsIRDFNode* aTarget) override {
return mInner->Unassert(aSource, aProperty, aTarget);
}
NS_IMETHOD Change(nsIRDFResource* aSource,
nsIRDFResource* aProperty,
nsIRDFNode* aOldTarget,
nsIRDFNode* aNewTarget) override {
return mInner->Change(aSource, aProperty, aOldTarget, aNewTarget);
}
NS_IMETHOD Move(nsIRDFResource* aOldSource,
nsIRDFResource* aNewSource,
nsIRDFResource* aProperty,
nsIRDFNode* aTarget) override {
return mInner->Move(aOldSource, aNewSource, aProperty, aTarget);
}
NS_IMETHOD HasAssertion(nsIRDFResource* aSource,
nsIRDFResource* aProperty,
nsIRDFNode* aTarget,
bool aTruthValue,
bool* hasAssertion) override {
return mInner->HasAssertion(aSource, aProperty, aTarget, aTruthValue, hasAssertion);
}
NS_IMETHOD AddObserver(nsIRDFObserver* aObserver) override {
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHOD RemoveObserver(nsIRDFObserver* aObserver) override {
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHOD HasArcIn(nsIRDFNode *aNode, nsIRDFResource *aArc, bool *_retval) override {
return mInner->HasArcIn(aNode, aArc, _retval);
}
NS_IMETHOD HasArcOut(nsIRDFResource *aSource, nsIRDFResource *aArc, bool *_retval) override {
return mInner->HasArcOut(aSource, aArc, _retval);
}
NS_IMETHOD ArcLabelsIn(nsIRDFNode* aNode,
nsISimpleEnumerator** aLabels) override {
return mInner->ArcLabelsIn(aNode, aLabels);
}
NS_IMETHOD ArcLabelsOut(nsIRDFResource* aSource,
nsISimpleEnumerator** aLabels) override {
return mInner->ArcLabelsOut(aSource, aLabels);
}
NS_IMETHOD GetAllResources(nsISimpleEnumerator** aResult) override {
return mInner->GetAllResources(aResult);
}
NS_IMETHOD GetAllCmds(nsIRDFResource* aSource,
nsISimpleEnumerator/*<nsIRDFResource>*/** aCommands) override;
NS_IMETHOD IsCommandEnabled(nsISupports* aSources,
nsIRDFResource* aCommand,
nsISupports* aArguments,
bool* aResult) override;
NS_IMETHOD DoCommand(nsISupports* aSources,
nsIRDFResource* aCommand,
nsISupports* aArguments) override;
NS_IMETHOD BeginUpdateBatch() override {
return mInner->BeginUpdateBatch();
}
NS_IMETHOD EndUpdateBatch() override {
return mInner->EndUpdateBatch();
}
NS_IMETHOD GetLoaded(bool* _result) override;
NS_IMETHOD Init(const char *uri) override;
NS_IMETHOD Flush() override;
NS_IMETHOD FlushTo(const char *aURI) override;
NS_IMETHOD Refresh(bool sync) override;
// nsIObserver
NS_DECL_NSIOBSERVER
};
////////////////////////////////////////////////////////////////////////
LocalStoreImpl::LocalStoreImpl(void)
{
}
LocalStoreImpl::~LocalStoreImpl(void)
{
if (mRDFService)
mRDFService->UnregisterDataSource(this);
}
nsresult
NS_NewLocalStore(nsISupports* aOuter, REFNSIID aIID, void** aResult)
{
NS_PRECONDITION(aOuter == nullptr, "no aggregation");
if (aOuter)
return NS_ERROR_NO_AGGREGATION;
NS_PRECONDITION(aResult != nullptr, "null ptr");
if (! aResult)
return NS_ERROR_NULL_POINTER;
LocalStoreImpl* impl = new LocalStoreImpl();
if (! impl)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(impl);
nsresult rv;
rv = impl->Init();
if (NS_SUCCEEDED(rv)) {
// Set up the result pointer
rv = impl->QueryInterface(aIID, aResult);
}
NS_RELEASE(impl);
return rv;
}
NS_IMPL_CYCLE_COLLECTION(LocalStoreImpl, mInner)
NS_IMPL_CYCLE_COLLECTING_ADDREF(LocalStoreImpl)
NS_IMPL_CYCLE_COLLECTING_RELEASE(LocalStoreImpl)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(LocalStoreImpl)
NS_INTERFACE_MAP_ENTRY(nsILocalStore)
NS_INTERFACE_MAP_ENTRY(nsIRDFDataSource)
NS_INTERFACE_MAP_ENTRY(nsIRDFRemoteDataSource)
NS_INTERFACE_MAP_ENTRY(nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsILocalStore)
NS_INTERFACE_MAP_END
// nsILocalStore interface
// nsIRDFDataSource interface
NS_IMETHODIMP
LocalStoreImpl::GetLoaded(bool* _result)
{
nsCOMPtr<nsIRDFRemoteDataSource> remote = do_QueryInterface(mInner);
NS_ASSERTION(remote != nullptr, "not an nsIRDFRemoteDataSource");
if (! remote)
return NS_ERROR_UNEXPECTED;
return remote->GetLoaded(_result);
}
NS_IMETHODIMP
LocalStoreImpl::Init(const char *uri)
{
return(NS_OK);
}
NS_IMETHODIMP
LocalStoreImpl::Flush()
{
nsCOMPtr<nsIRDFRemoteDataSource> remote = do_QueryInterface(mInner);
// FIXME Bug 340242: Temporarily make this a warning rather than an
// assertion until we sort out the ordering of how we write
// everything to the localstore, flush it, and disconnect it when
// we're getting profile-change notifications.
NS_WARNING_ASSERTION(remote != nullptr, "not an nsIRDFRemoteDataSource");
if (! remote)
return NS_ERROR_UNEXPECTED;
return remote->Flush();
}
NS_IMETHODIMP
LocalStoreImpl::FlushTo(const char *aURI)
{
// Do not ever implement this (security)
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
LocalStoreImpl::Refresh(bool sync)
{
nsCOMPtr<nsIRDFRemoteDataSource> remote = do_QueryInterface(mInner);
NS_ASSERTION(remote != nullptr, "not an nsIRDFRemoteDataSource");
if (! remote)
return NS_ERROR_UNEXPECTED;
return remote->Refresh(sync);
}
nsresult
LocalStoreImpl::Init()
{
nsresult rv;
rv = LoadData();
if (NS_FAILED(rv)) return rv;
// register this as a named data source with the RDF service
mRDFService = do_GetService(NS_RDF_CONTRACTID "/rdf-service;1", &rv);
if (NS_FAILED(rv)) return rv;
mRDFService->RegisterDataSource(this, false);
// Register as an observer of profile changes
nsCOMPtr<nsIObserverService> obs =
do_GetService("@mozilla.org/observer-service;1");
if (obs) {
obs->AddObserver(this, "profile-before-change", true);
obs->AddObserver(this, "profile-do-change", true);
}
return NS_OK;
}
nsresult
LocalStoreImpl::CreateLocalStore(nsIFile* aFile)
{
nsresult rv;
rv = aFile->Create(nsIFile::NORMAL_FILE_TYPE, 0666);
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsIOutputStream> outStream;
rv = NS_NewLocalFileOutputStream(getter_AddRefs(outStream), aFile);
if (NS_FAILED(rv)) return rv;
const char defaultRDF[] =
"<?xml version=\"1.0\"?>\n" \
"<RDF:RDF xmlns:RDF=\"" RDF_NAMESPACE_URI "\"\n" \
" xmlns:NC=\"" NC_NAMESPACE_URI "\">\n" \
" <!-- Empty -->\n" \
"</RDF:RDF>\n";
uint32_t count;
rv = outStream->Write(defaultRDF, sizeof(defaultRDF)-1, &count);
if (NS_FAILED(rv)) return rv;
if (count != sizeof(defaultRDF)-1)
return NS_ERROR_UNEXPECTED;
// Okay, now see if the file exists _for real_. If it's still
// not there, it could be that the profile service gave us
// back a read-only directory. Whatever.
bool fileExistsFlag = false;
aFile->Exists(&fileExistsFlag);
if (!fileExistsFlag)
return NS_ERROR_UNEXPECTED;
return NS_OK;
}
nsresult
LocalStoreImpl::LoadData()
{
nsresult rv;
// Look for localstore.rdf in the current profile
// directory. Bomb if we can't find it.
nsCOMPtr<nsIFile> aFile;
rv = NS_GetSpecialDirectory(NS_APP_LOCALSTORE_50_FILE, getter_AddRefs(aFile));
if (NS_FAILED(rv)) return rv;
bool fileExistsFlag = false;
(void)aFile->Exists(&fileExistsFlag);
if (!fileExistsFlag) {
// if file doesn't exist, create it
rv = CreateLocalStore(aFile);
if (NS_FAILED(rv)) return rv;
}
mInner = do_CreateInstance(NS_RDF_DATASOURCE_CONTRACTID_PREFIX "xml-datasource", &rv);
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsIRDFRemoteDataSource> remote = do_QueryInterface(mInner, &rv);
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsIURI> aURI;
rv = NS_NewFileURI(getter_AddRefs(aURI), aFile);
if (NS_FAILED(rv)) return rv;
nsAutoCString spec;
rv = aURI->GetSpec(spec);
if (NS_FAILED(rv)) return rv;
rv = remote->Init(spec.get());
if (NS_FAILED(rv)) return rv;
// Read the datasource synchronously.
rv = remote->Refresh(true);
if (NS_FAILED(rv)) {
// Load failed, delete and recreate a fresh localstore
aFile->Remove(true);
rv = CreateLocalStore(aFile);
if (NS_FAILED(rv)) return rv;
rv = remote->Refresh(true);
}
return rv;
}
NS_IMETHODIMP
LocalStoreImpl::GetURI(nsACString& aURI)
{
aURI.AssignLiteral("rdf:local-store");
return NS_OK;
}
NS_IMETHODIMP
LocalStoreImpl::GetAllCmds(nsIRDFResource* aSource,
nsISimpleEnumerator/*<nsIRDFResource>*/** aCommands)
{
return(NS_NewEmptyEnumerator(aCommands));
}
NS_IMETHODIMP
LocalStoreImpl::IsCommandEnabled(nsISupports* aSources,
nsIRDFResource* aCommand,
nsISupports* aArguments,
bool* aResult)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
LocalStoreImpl::DoCommand(nsISupports* aSources,
nsIRDFResource* aCommand,
nsISupports* aArguments)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
LocalStoreImpl::Observe(nsISupports *aSubject, const char *aTopic, const char16_t *someData)
{
nsresult rv = NS_OK;
if (!nsCRT::strcmp(aTopic, "profile-before-change")) {
// Write out the old datasource's contents.
if (mInner) {
nsCOMPtr<nsIRDFRemoteDataSource> remote = do_QueryInterface(mInner);
if (remote)
remote->Flush();
}
// Create an in-memory datasource for use while we're
// profile-less.
mInner = do_CreateInstance(NS_RDF_DATASOURCE_CONTRACTID_PREFIX "in-memory-datasource");
}
else if (!nsCRT::strcmp(aTopic, "profile-do-change")) {
rv = LoadData();
}
return rv;
}
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