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gecko-dev/intl/strres/nsStringBundle.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#include "nsStringBundle.h"
#include "nsID.h"
#include "nsString.h"
#include "nsIStringBundle.h"
#include "nsStringBundleService.h"
#include "nsArrayEnumerator.h"
#include "nscore.h"
#include "nsMemory.h"
#include "nsNetUtil.h"
#include "nsComponentManagerUtils.h"
#include "nsServiceManagerUtils.h"
#include "nsIInputStream.h"
#include "nsIURI.h"
#include "nsIObserverService.h"
#include "nsCOMArray.h"
#include "nsTextFormatter.h"
#include "nsErrorService.h"
#include "nsContentUtils.h"
#include "nsPersistentProperties.h"
#include "nsQueryObject.h"
#include "nsSimpleEnumerator.h"
#include "nsStringStream.h"
#include "mozilla/BinarySearch.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/ResultExtensions.h"
#include "mozilla/URLPreloader.h"
#include "mozilla/ResultExtensions.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/ipc/SharedStringMap.h"
// for async loading
#ifdef ASYNC_LOADING
# include "nsIBinaryInputStream.h"
# include "nsIStringStream.h"
#endif
using namespace mozilla;
using mozilla::dom::ContentParent;
using mozilla::dom::StringBundleDescriptor;
using mozilla::dom::ipc::SharedStringMap;
using mozilla::dom::ipc::SharedStringMapBuilder;
using mozilla::ipc::FileDescriptor;
/**
* A set of string bundle URLs which are loaded by content processes, and
* should be allocated in a shared memory region, and then sent to content
* processes.
*
* Note: This layout is chosen to avoid having to create a separate char*
* array pointing to the string constant values, which would require
* per-process relocations. The second array size is the length of the longest
* URL plus its null terminator. Shorter strings are null padded to this
* length.
*
* This should be kept in sync with the similar array in nsContentUtils.cpp,
* and updated with any other property files which need to be loaded in all
* content processes.
*/
static const char kContentBundles[][52] = {
"chrome://branding/locale/brand.properties",
"chrome://global/locale/commonDialogs.properties",
"chrome://global/locale/css.properties",
"chrome://global/locale/dom/dom.properties",
"chrome://global/locale/layout/HtmlForm.properties",
"chrome://global/locale/layout/htmlparser.properties",
"chrome://global/locale/layout_errors.properties",
"chrome://global/locale/mathml/mathml.properties",
"chrome://global/locale/printing.properties",
"chrome://global/locale/security/csp.properties",
"chrome://global/locale/security/security.properties",
"chrome://global/locale/svg/svg.properties",
"chrome://global/locale/xul.properties",
"chrome://necko/locale/necko.properties",
};
static bool IsContentBundle(const nsCString& aUrl) {
size_t index;
return BinarySearchIf(
kContentBundles, 0, MOZ_ARRAY_LENGTH(kContentBundles),
[&](const char* aElem) { return aUrl.Compare(aElem); }, &index);
}
namespace {
#define STRINGBUNDLEPROXY_IID \
{ \
0x537cf21b, 0x99fc, 0x4002, { \
0x9e, 0xec, 0x97, 0xbe, 0x4d, 0xe0, 0xb3, 0xdc \
} \
}
/**
* A simple proxy class for a string bundle instance which will be replaced by
* a different implementation later in the session.
*
* This is used when creating string bundles which should use shared memory,
* but the content process has not yet received their shared memory buffer.
* When the shared memory variant becomes available, this proxy is retarged to
* that instance, and the original non-shared instance is destroyed.
*
* At that point, the cache entry for the proxy is replaced with the shared
* memory instance, and callers which already have an instance of the proxy
* are redirected to the new instance.
*/
class StringBundleProxy : public nsIStringBundle {
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECLARE_STATIC_IID_ACCESSOR(STRINGBUNDLEPROXY_IID)
explicit StringBundleProxy(already_AddRefed<nsIStringBundle> aTarget)
: mMutex("StringBundleProxy::mMutex"), mTarget(aTarget) {}
NS_FORWARD_NSISTRINGBUNDLE(Target()->);
void Retarget(nsIStringBundle* aTarget) {
MutexAutoLock automon(mMutex);
mTarget = aTarget;
}
size_t SizeOfIncludingThis(
mozilla::MallocSizeOf aMallocSizeOf) const override {
return aMallocSizeOf(this);
}
size_t SizeOfIncludingThisIfUnshared(
mozilla::MallocSizeOf aMallocSizeOf) const override {
return mRefCnt == 1 ? SizeOfIncludingThis(aMallocSizeOf) : 0;
}
protected:
virtual ~StringBundleProxy() = default;
private:
Mutex mMutex;
nsCOMPtr<nsIStringBundle> mTarget;
// Atomically reads mTarget and returns a strong reference to it. This
// allows for safe multi-threaded use when the proxy may be retargetted by
// the main thread during access.
nsCOMPtr<nsIStringBundle> Target() {
MutexAutoLock automon(mMutex);
return mTarget;
}
};
NS_DEFINE_STATIC_IID_ACCESSOR(StringBundleProxy, STRINGBUNDLEPROXY_IID)
NS_IMPL_ISUPPORTS(StringBundleProxy, nsIStringBundle, StringBundleProxy)
#define SHAREDSTRINGBUNDLE_IID \
{ \
0x7a8df5f7, 0x9e50, 0x44f6, { \
0xbf, 0x89, 0xc7, 0xad, 0x6c, 0x17, 0xf8, 0x5f \
} \
}
/**
* A string bundle backed by a read-only, shared memory buffer. This should
* only be used for string bundles which are used in child processes.
*
* Important: The memory allocated by these string bundles will never be freed
* before process shutdown, per the restrictions in SharedStringMap.h, so they
* should never be used for short-lived bundles.
*/
class SharedStringBundle final : public nsStringBundleBase {
public:
/**
* Initialize the string bundle with a file descriptor pointing to a
* pre-populated key-value store for this string bundle. This should only be
* called in child processes, for bundles initially created in the parent
* process.
*/
void SetMapFile(const FileDescriptor& aFile, size_t aSize);
NS_DECL_ISUPPORTS_INHERITED
NS_DECLARE_STATIC_IID_ACCESSOR(SHAREDSTRINGBUNDLE_IID)
nsresult LoadProperties() override;
/**
* Returns a copy of the file descriptor pointing to the shared memory
* key-values tore for this string bundle. This should only be called in the
* parent process, and may be used to send shared string bundles to child
* processes.
*/
FileDescriptor CloneFileDescriptor() const {
MOZ_ASSERT(XRE_IsParentProcess());
if (mMapFile.isSome()) {
return mMapFile.ref();
}
return mStringMap->CloneFileDescriptor();
}
size_t MapSize() const {
if (mMapFile.isSome()) {
return mMapSize;
}
if (mStringMap) {
return mStringMap->MapSize();
}
return 0;
}
bool Initialized() const { return mStringMap || mMapFile.isSome(); }
StringBundleDescriptor GetDescriptor() const {
MOZ_ASSERT(Initialized());
StringBundleDescriptor descriptor;
descriptor.bundleURL() = BundleURL();
descriptor.mapFile() = CloneFileDescriptor();
descriptor.mapSize() = MapSize();
return descriptor;
}
size_t SizeOfIncludingThis(
mozilla::MallocSizeOf aMallocSizeOf) const override;
static SharedStringBundle* Cast(nsIStringBundle* aStringBundle) {
return static_cast<SharedStringBundle*>(aStringBundle);
}
protected:
friend class nsStringBundleBase;
explicit SharedStringBundle(const char* aURLSpec)
: nsStringBundleBase(aURLSpec) {}
~SharedStringBundle() override = default;
nsresult GetStringImpl(const nsACString& aName, nsAString& aResult) override;
nsresult GetSimpleEnumerationImpl(nsISimpleEnumerator** elements) override;
private:
RefPtr<SharedStringMap> mStringMap;
Maybe<FileDescriptor> mMapFile;
size_t mMapSize;
};
NS_DEFINE_STATIC_IID_ACCESSOR(SharedStringBundle, SHAREDSTRINGBUNDLE_IID)
class StringMapEnumerator final : public nsSimpleEnumerator {
public:
NS_DECL_NSISIMPLEENUMERATOR
explicit StringMapEnumerator(SharedStringMap* aStringMap)
: mStringMap(aStringMap) {}
const nsID& DefaultInterface() override {
return NS_GET_IID(nsIPropertyElement);
}
protected:
virtual ~StringMapEnumerator() = default;
private:
RefPtr<SharedStringMap> mStringMap;
uint32_t mIndex = 0;
};
template <typename T, typename... Args>
already_AddRefed<T> MakeBundle(Args... args) {
return nsStringBundleBase::Create<T>(args...);
}
template <typename T, typename... Args>
RefPtr<T> MakeBundleRefPtr(Args... args) {
return nsStringBundleBase::Create<T>(args...);
}
} // anonymous namespace
NS_IMPL_ISUPPORTS(nsStringBundleBase, nsIStringBundle, nsIMemoryReporter)
NS_IMPL_ISUPPORTS_INHERITED0(nsStringBundle, nsStringBundleBase)
NS_IMPL_ISUPPORTS_INHERITED(SharedStringBundle, nsStringBundleBase,
SharedStringBundle)
nsStringBundleBase::nsStringBundleBase(const char* aURLSpec)
: mPropertiesURL(aURLSpec),
mMutex("nsStringBundle.mMutex"),
mAttemptedLoad(false),
mLoaded(false) {}
nsStringBundleBase::~nsStringBundleBase() {
UnregisterWeakMemoryReporter(this);
}
void nsStringBundleBase::RegisterMemoryReporter() {
RegisterWeakMemoryReporter(this);
}
template <typename T, typename... Args>
/* static */
already_AddRefed<T> nsStringBundleBase::Create(Args... args) {
RefPtr<T> bundle = new T(args...);
bundle->RegisterMemoryReporter();
return bundle.forget();
}
nsStringBundle::nsStringBundle(const char* aURLSpec)
: nsStringBundleBase(aURLSpec) {}
nsStringBundle::~nsStringBundle() = default;
NS_IMETHODIMP
nsStringBundleBase::AsyncPreload() {
return NS_DispatchToCurrentThreadQueue(
NewIdleRunnableMethod("nsStringBundleBase::LoadProperties", this,
&nsStringBundleBase::LoadProperties),
EventQueuePriority::Idle);
}
size_t nsStringBundle::SizeOfIncludingThis(
mozilla::MallocSizeOf aMallocSizeOf) const {
size_t n = 0;
if (mProps) {
n += mProps->SizeOfIncludingThis(aMallocSizeOf);
}
return aMallocSizeOf(this) + n;
}
size_t nsStringBundleBase::SizeOfIncludingThisIfUnshared(
mozilla::MallocSizeOf aMallocSizeOf) const {
if (mRefCnt == 1) {
return SizeOfIncludingThis(aMallocSizeOf);
} else {
return 0;
}
}
size_t SharedStringBundle::SizeOfIncludingThis(
mozilla::MallocSizeOf aMallocSizeOf) const {
size_t n = 0;
if (mStringMap) {
n += aMallocSizeOf(mStringMap);
}
return aMallocSizeOf(this) + n;
}
NS_IMETHODIMP
nsStringBundleBase::CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize) {
// String bundle URLs are always local, and part of the distribution.
// There's no need to anonymize.
nsAutoCStringN<64> escapedURL(mPropertiesURL);
escapedURL.ReplaceChar('/', '\\');
size_t sharedSize = 0;
size_t heapSize = SizeOfIncludingThis(MallocSizeOf);
nsAutoCStringN<256> path("explicit/string-bundles/");
if (RefPtr<SharedStringBundle> shared = do_QueryObject(this)) {
path.AppendLiteral("SharedStringBundle");
if (XRE_IsParentProcess()) {
sharedSize = shared->MapSize();
}
} else {
path.AppendLiteral("nsStringBundle");
}
path.AppendLiteral("(url=\"");
path.Append(escapedURL);
// Note: The memory reporter service holds a strong reference to reporters
// while collecting reports, so we want to ignore the extra ref in reports.
path.AppendLiteral("\", shared=");
path.AppendASCII(mRefCnt > 2 ? "true" : "false");
path.AppendLiteral(", refCount=");
path.AppendInt(uint32_t(mRefCnt - 1));
if (sharedSize) {
path.AppendLiteral(", sharedMemorySize=");
path.AppendInt(uint32_t(sharedSize));
}
path.AppendLiteral(")");
constexpr auto desc =
"A StringBundle instance representing the data in a (probably "
"localized) .properties file. Data may be shared between "
"processes."_ns;
aHandleReport->Callback(""_ns, path, KIND_HEAP, UNITS_BYTES, heapSize, desc,
aData);
if (sharedSize) {
path.ReplaceLiteral(0, sizeof("explicit/") - 1, "shared-");
aHandleReport->Callback(""_ns, path, KIND_OTHER, UNITS_BYTES, sharedSize,
desc, aData);
}
return NS_OK;
}
nsresult nsStringBundleBase::ParseProperties(nsIPersistentProperties** aProps) {
// this is different than mLoaded, because we only want to attempt
// to load once
// we only want to load once, but if we've tried once and failed,
// continue to throw an error!
if (mAttemptedLoad) {
if (mLoaded) return NS_OK;
return NS_ERROR_UNEXPECTED;
}
MOZ_ASSERT(NS_IsMainThread(),
"String bundles must be initialized on the main thread "
"before they may be used off-main-thread");
mAttemptedLoad = true;
nsresult rv;
// do it synchronously
nsCOMPtr<nsIURI> uri;
rv = NS_NewURI(getter_AddRefs(uri), mPropertiesURL);
if (NS_FAILED(rv)) return rv;
// whitelist check for local schemes
nsCString scheme;
uri->GetScheme(scheme);
if (!scheme.EqualsLiteral("chrome") && !scheme.EqualsLiteral("jar") &&
!scheme.EqualsLiteral("resource") && !scheme.EqualsLiteral("file") &&
!scheme.EqualsLiteral("data")) {
return NS_ERROR_ABORT;
}
nsCOMPtr<nsIInputStream> in;
auto result = URLPreloader::ReadURI(uri);
if (result.isOk()) {
MOZ_TRY(NS_NewCStringInputStream(getter_AddRefs(in), result.unwrap()));
} else {
nsCOMPtr<nsIChannel> channel;
rv = NS_NewChannel(getter_AddRefs(channel), uri,
nsContentUtils::GetSystemPrincipal(),
nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_SEC_CONTEXT_IS_NULL,
nsIContentPolicy::TYPE_OTHER);
if (NS_FAILED(rv)) return rv;
// It's a string bundle. We expect a text/plain type, so set that as hint
channel->SetContentType("text/plain"_ns);
rv = channel->Open(getter_AddRefs(in));
if (NS_FAILED(rv)) return rv;
}
auto props = MakeRefPtr<nsPersistentProperties>();
mAttemptedLoad = true;
MOZ_TRY(props->Load(in));
props.forget(aProps);
mLoaded = true;
return NS_OK;
}
nsresult nsStringBundle::LoadProperties() {
if (mProps) {
return NS_OK;
}
return ParseProperties(getter_AddRefs(mProps));
}
nsresult SharedStringBundle::LoadProperties() {
if (mStringMap) return NS_OK;
if (mMapFile.isSome()) {
mStringMap = new SharedStringMap(mMapFile.ref(), mMapSize);
mMapFile.reset();
return NS_OK;
}
MOZ_ASSERT(NS_IsMainThread(),
"String bundles must be initialized on the main thread "
"before they may be used off-main-thread");
// We can't access the locale service after shutdown has started, which
// means we can't attempt to load chrome: locale resources (which most of
// our string bundles come from). Since shared string bundles won't be
// useful after shutdown has started anyway (and we almost certainly got
// here from a pre-load attempt in an idle task), just bail out.
if (PastShutdownPhase(ShutdownPhase::Shutdown)) {
return NS_ERROR_ILLEGAL_DURING_SHUTDOWN;
}
// We should only populate shared memory string bundles in the parent
// process. Instances in the child process should always be instantiated
// with a shared memory file descriptor sent from the parent.
MOZ_ASSERT(XRE_IsParentProcess());
nsCOMPtr<nsIPersistentProperties> props;
MOZ_TRY(ParseProperties(getter_AddRefs(props)));
SharedStringMapBuilder builder;
nsCOMPtr<nsISimpleEnumerator> iter;
MOZ_TRY(props->Enumerate(getter_AddRefs(iter)));
bool hasMore;
while (NS_SUCCEEDED(iter->HasMoreElements(&hasMore)) && hasMore) {
nsCOMPtr<nsISupports> next;
MOZ_TRY(iter->GetNext(getter_AddRefs(next)));
nsresult rv;
nsCOMPtr<nsIPropertyElement> elem = do_QueryInterface(next, &rv);
MOZ_TRY(rv);
nsCString key;
nsString value;
MOZ_TRY(elem->GetKey(key));
MOZ_TRY(elem->GetValue(value));
builder.Add(key, value);
}
mStringMap = new SharedStringMap(std::move(builder));
ContentParent::BroadcastStringBundle(GetDescriptor());
return NS_OK;
}
void SharedStringBundle::SetMapFile(const FileDescriptor& aFile, size_t aSize) {
MOZ_ASSERT(XRE_IsContentProcess());
mStringMap = nullptr;
mMapFile.emplace(aFile);
mMapSize = aSize;
}
NS_IMETHODIMP
nsStringBundleBase::GetStringFromID(int32_t aID, nsAString& aResult) {
nsAutoCString idStr;
idStr.AppendInt(aID, 10);
return GetStringFromName(idStr.get(), aResult);
}
NS_IMETHODIMP
nsStringBundleBase::GetStringFromAUTF8Name(const nsACString& aName,
nsAString& aResult) {
return GetStringFromName(PromiseFlatCString(aName).get(), aResult);
}
NS_IMETHODIMP
nsStringBundleBase::GetStringFromName(const char* aName, nsAString& aResult) {
NS_ENSURE_ARG_POINTER(aName);
MutexAutoLock autolock(mMutex);
return GetStringImpl(nsDependentCString(aName), aResult);
}
nsresult nsStringBundle::GetStringImpl(const nsACString& aName,
nsAString& aResult) {
MOZ_TRY(LoadProperties());
return mProps->GetStringProperty(aName, aResult);
}
nsresult SharedStringBundle::GetStringImpl(const nsACString& aName,
nsAString& aResult) {
MOZ_TRY(LoadProperties());
if (mStringMap->Get(PromiseFlatCString(aName), aResult)) {
return NS_OK;
}
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsStringBundleBase::FormatStringFromID(int32_t aID,
const nsTArray<nsString>& aParams,
nsAString& aResult) {
nsAutoCString idStr;
idStr.AppendInt(aID, 10);
return FormatStringFromName(idStr.get(), aParams, aResult);
}
// this function supports at most 10 parameters.. see below for why
NS_IMETHODIMP
nsStringBundleBase::FormatStringFromAUTF8Name(const nsACString& aName,
const nsTArray<nsString>& aParams,
nsAString& aResult) {
return FormatStringFromName(PromiseFlatCString(aName).get(), aParams,
aResult);
}
// this function supports at most 10 parameters.. see below for why
NS_IMETHODIMP
nsStringBundleBase::FormatStringFromName(const char* aName,
const nsTArray<nsString>& aParams,
nsAString& aResult) {
NS_ASSERTION(!aParams.IsEmpty(),
"FormatStringFromName() without format parameters: use "
"GetStringFromName() instead");
nsAutoString formatStr;
nsresult rv = GetStringFromName(aName, formatStr);
if (NS_FAILED(rv)) return rv;
return FormatString(formatStr.get(), aParams, aResult);
}
NS_IMETHODIMP
nsStringBundleBase::GetSimpleEnumeration(nsISimpleEnumerator** aElements) {
NS_ENSURE_ARG_POINTER(aElements);
return GetSimpleEnumerationImpl(aElements);
}
nsresult nsStringBundle::GetSimpleEnumerationImpl(
nsISimpleEnumerator** elements) {
MOZ_TRY(LoadProperties());
return mProps->Enumerate(elements);
}
nsresult SharedStringBundle::GetSimpleEnumerationImpl(
nsISimpleEnumerator** aEnumerator) {
MOZ_TRY(LoadProperties());
auto iter = MakeRefPtr<StringMapEnumerator>(mStringMap);
iter.forget(aEnumerator);
return NS_OK;
}
NS_IMETHODIMP
StringMapEnumerator::HasMoreElements(bool* aHasMore) {
*aHasMore = mIndex < mStringMap->Count();
return NS_OK;
}
NS_IMETHODIMP
StringMapEnumerator::GetNext(nsISupports** aNext) {
if (mIndex >= mStringMap->Count()) {
return NS_ERROR_FAILURE;
}
auto elem = MakeRefPtr<nsPropertyElement>(mStringMap->GetKeyAt(mIndex),
mStringMap->GetValueAt(mIndex));
elem.forget(aNext);
mIndex++;
return NS_OK;
}
nsresult nsStringBundleBase::FormatString(const char16_t* aFormatStr,
const nsTArray<nsString>& aParams,
nsAString& aResult) {
auto length = aParams.Length();
NS_ENSURE_ARG(length <= 10); // enforce 10-parameter limit
// implementation note: you would think you could use vsmprintf
// to build up an arbitrary length array.. except that there
// is no way to build up a va_list at runtime!
// Don't believe me? See:
// http://www.eskimo.com/~scs/C-faq/q15.13.html
// -alecf
nsTextFormatter::ssprintf(aResult, aFormatStr,
length >= 1 ? aParams[0].get() : nullptr,
length >= 2 ? aParams[1].get() : nullptr,
length >= 3 ? aParams[2].get() : nullptr,
length >= 4 ? aParams[3].get() : nullptr,
length >= 5 ? aParams[4].get() : nullptr,
length >= 6 ? aParams[5].get() : nullptr,
length >= 7 ? aParams[6].get() : nullptr,
length >= 8 ? aParams[7].get() : nullptr,
length >= 9 ? aParams[8].get() : nullptr,
length >= 10 ? aParams[9].get() : nullptr);
return NS_OK;
}
/////////////////////////////////////////////////////////////////////////////////////////
#define MAX_CACHED_BUNDLES 16
struct bundleCacheEntry_t final : public LinkedListElement<bundleCacheEntry_t> {
nsCString mHashKey;
nsCOMPtr<nsIStringBundle> mBundle;
MOZ_COUNTED_DEFAULT_CTOR(bundleCacheEntry_t)
MOZ_COUNTED_DTOR(bundleCacheEntry_t)
};
nsStringBundleService::nsStringBundleService()
: mBundleMap(MAX_CACHED_BUNDLES) {
mErrorService = nsErrorService::GetOrCreate();
MOZ_ALWAYS_TRUE(mErrorService);
}
NS_IMPL_ISUPPORTS(nsStringBundleService, nsIStringBundleService, nsIObserver,
nsISupportsWeakReference, nsIMemoryReporter)
nsStringBundleService::~nsStringBundleService() {
UnregisterWeakMemoryReporter(this);
flushBundleCache(/* ignoreShared = */ false);
}
nsresult nsStringBundleService::Init() {
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
os->AddObserver(this, "memory-pressure", true);
os->AddObserver(this, "profile-do-change", true);
os->AddObserver(this, "chrome-flush-caches", true);
os->AddObserver(this, "intl:app-locales-changed", true);
}
RegisterWeakMemoryReporter(this);
return NS_OK;
}
size_t nsStringBundleService::SizeOfIncludingThis(
mozilla::MallocSizeOf aMallocSizeOf) const {
size_t n = mBundleMap.ShallowSizeOfExcludingThis(aMallocSizeOf);
for (auto iter = mBundleMap.ConstIter(); !iter.Done(); iter.Next()) {
n += aMallocSizeOf(iter.Data());
n += iter.Data()->mHashKey.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
}
return aMallocSizeOf(this) + n;
}
NS_IMETHODIMP
nsStringBundleService::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aSomeData) {
if (strcmp("profile-do-change", aTopic) == 0 ||
strcmp("chrome-flush-caches", aTopic) == 0 ||
strcmp("intl:app-locales-changed", aTopic) == 0) {
flushBundleCache(/* ignoreShared = */ false);
} else if (strcmp("memory-pressure", aTopic) == 0) {
flushBundleCache(/* ignoreShared = */ true);
}
return NS_OK;
}
void nsStringBundleService::flushBundleCache(bool ignoreShared) {
LinkedList<bundleCacheEntry_t> newList;
while (!mBundleCache.isEmpty()) {
UniquePtr<bundleCacheEntry_t> entry(mBundleCache.popFirst());
auto* bundle = nsStringBundleBase::Cast(entry->mBundle);
if (ignoreShared && bundle->IsShared()) {
newList.insertBack(entry.release());
} else {
mBundleMap.Remove(entry->mHashKey);
}
}
mBundleCache = std::move(newList);
}
NS_IMETHODIMP
nsStringBundleService::FlushBundles() {
flushBundleCache(/* ignoreShared = */ false);
return NS_OK;
}
void nsStringBundleService::SendContentBundles(
ContentParent* aContentParent) const {
nsTArray<StringBundleDescriptor> bundles;
for (auto* entry : mSharedBundles) {
auto bundle = SharedStringBundle::Cast(entry->mBundle);
if (bundle->Initialized()) {
bundles.AppendElement(bundle->GetDescriptor());
}
}
Unused << aContentParent->SendRegisterStringBundles(std::move(bundles));
}
void nsStringBundleService::RegisterContentBundle(
const nsCString& aBundleURL, const FileDescriptor& aMapFile,
size_t aMapSize) {
RefPtr<StringBundleProxy> proxy;
bundleCacheEntry_t* cacheEntry = mBundleMap.Get(aBundleURL);
if (cacheEntry) {
if (RefPtr<SharedStringBundle> shared =
do_QueryObject(cacheEntry->mBundle)) {
return;
}
proxy = do_QueryObject(cacheEntry->mBundle);
MOZ_ASSERT(proxy);
cacheEntry->remove();
delete cacheEntry;
}
auto bundle = MakeBundleRefPtr<SharedStringBundle>(aBundleURL.get());
bundle->SetMapFile(aMapFile, aMapSize);
if (proxy) {
proxy->Retarget(bundle);
}
cacheEntry = insertIntoCache(bundle.forget(), aBundleURL);
mSharedBundles.insertBack(cacheEntry);
}
void nsStringBundleService::getStringBundle(const char* aURLSpec,
nsIStringBundle** aResult) {
nsDependentCString key(aURLSpec);
bundleCacheEntry_t* cacheEntry = mBundleMap.Get(key);
RefPtr<SharedStringBundle> shared;
if (cacheEntry) {
// Remove the entry from the list so it can be re-inserted at the back.
cacheEntry->remove();
shared = do_QueryObject(cacheEntry->mBundle);
} else {
nsCOMPtr<nsIStringBundle> bundle;
bool isContent = IsContentBundle(key);
if (!isContent || !XRE_IsParentProcess()) {
bundle = MakeBundle<nsStringBundle>(aURLSpec);
}
// If this is a bundle which is used by the content processes, we want to
// load it into a shared memory region.
//
// If we're in the parent process, just create a new SharedStringBundle,
// and populate it from the properties file.
//
// If we're in a child process, the fact that the bundle is not already in
// the cache means that we haven't received its shared memory descriptor
// from the parent yet. There's not much we can do about that besides
// wait, but we need to return a bundle now. So instead of a shared memory
// bundle, we create a temporary proxy, which points to a non-shared
// bundle initially, and is retarged to a shared memory bundle when it
// becomes available.
if (isContent) {
if (XRE_IsParentProcess()) {
shared = MakeBundle<SharedStringBundle>(aURLSpec);
bundle = shared;
} else {
bundle = new StringBundleProxy(bundle.forget());
}
}
cacheEntry = insertIntoCache(bundle.forget(), key);
}
if (shared) {
mSharedBundles.insertBack(cacheEntry);
} else {
mBundleCache.insertBack(cacheEntry);
}
// finally, return the value
*aResult = cacheEntry->mBundle;
NS_ADDREF(*aResult);
}
UniquePtr<bundleCacheEntry_t> nsStringBundleService::evictOneEntry() {
for (auto* entry : mBundleCache) {
auto* bundle = nsStringBundleBase::Cast(entry->mBundle);
if (!bundle->IsShared()) {
entry->remove();
mBundleMap.Remove(entry->mHashKey);
return UniquePtr<bundleCacheEntry_t>(entry);
}
}
return nullptr;
}
bundleCacheEntry_t* nsStringBundleService::insertIntoCache(
already_AddRefed<nsIStringBundle> aBundle, const nsACString& aHashKey) {
UniquePtr<bundleCacheEntry_t> cacheEntry;
if (mBundleMap.Count() >= MAX_CACHED_BUNDLES) {
cacheEntry = evictOneEntry();
}
if (!cacheEntry) {
cacheEntry.reset(new bundleCacheEntry_t());
}
cacheEntry->mHashKey = aHashKey;
cacheEntry->mBundle = aBundle;
mBundleMap.Put(cacheEntry->mHashKey, cacheEntry.get());
return cacheEntry.release();
}
NS_IMETHODIMP
nsStringBundleService::CreateBundle(const char* aURLSpec,
nsIStringBundle** aResult) {
getStringBundle(aURLSpec, aResult);
return NS_OK;
}
#define GLOBAL_PROPERTIES "chrome://global/locale/global-strres.properties"
nsresult nsStringBundleService::FormatWithBundle(
nsIStringBundle* bundle, nsresult aStatus,
const nsTArray<nsString>& argArray, nsAString& result) {
nsresult rv;
// try looking up the error message with the int key:
uint16_t code = NS_ERROR_GET_CODE(aStatus);
rv = bundle->FormatStringFromID(code, argArray, result);
// If the int key fails, try looking up the default error message. E.g. print:
// An unknown error has occurred (0x804B0003).
if (NS_FAILED(rv)) {
AutoTArray<nsString, 1> otherArgArray;
otherArgArray.AppendElement()->AppendInt(static_cast<uint32_t>(aStatus),
16);
uint16_t code = NS_ERROR_GET_CODE(NS_ERROR_FAILURE);
rv = bundle->FormatStringFromID(code, otherArgArray, result);
}
return rv;
}
NS_IMETHODIMP
nsStringBundleService::FormatStatusMessage(nsresult aStatus,
const char16_t* aStatusArg,
nsAString& result) {
nsresult rv;
uint32_t i, argCount = 0;
nsCOMPtr<nsIStringBundle> bundle;
nsCString stringBundleURL;
// XXX hack for mailnews who has already formatted their messages:
if (aStatus == NS_OK && aStatusArg) {
result.Assign(aStatusArg);
return NS_OK;
}
if (aStatus == NS_OK) {
return NS_ERROR_FAILURE; // no message to format
}
// format the arguments:
const nsDependentString args(aStatusArg);
argCount = args.CountChar(char16_t('\n')) + 1;
NS_ENSURE_ARG(argCount <= 10); // enforce 10-parameter limit
AutoTArray<nsString, 10> argArray;
// convert the aStatusArg into an nsString array
if (argCount == 1) {
argArray.AppendElement(aStatusArg);
} else if (argCount > 1) {
int32_t offset = 0;
for (i = 0; i < argCount; i++) {
int32_t pos = args.FindChar('\n', offset);
if (pos == -1) pos = args.Length();
argArray.AppendElement(Substring(args, offset, pos - offset));
offset = pos + 1;
}
}
// find the string bundle for the error's module:
rv = mErrorService->GetErrorStringBundle(NS_ERROR_GET_MODULE(aStatus),
getter_Copies(stringBundleURL));
if (NS_SUCCEEDED(rv)) {
getStringBundle(stringBundleURL.get(), getter_AddRefs(bundle));
rv = FormatWithBundle(bundle, aStatus, argArray, result);
}
if (NS_FAILED(rv)) {
getStringBundle(GLOBAL_PROPERTIES, getter_AddRefs(bundle));
rv = FormatWithBundle(bundle, aStatus, argArray, result);
}
return rv;
}
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