2406ce261c
Backed out changeset 8d9053f1c203 (bug 1942129) Backed out changeset 393e3c507c27 (bug 1942129) Backed out changeset 8240d353d224 (bug 1942129) Backed out changeset 8c4cd026b720 (bug 1942129) Backed out changeset 742634b0d6e9 (bug 1942129) Backed out changeset d16857f9812f (bug 1942129) Backed out changeset 7ff7af041ee7 (bug 1942129) Backed out changeset ef41d9e4c7de (bug 1942129)
565 lines
23 KiB
C++
565 lines
23 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Documentation for libpref is in modules/libpref/docs/index.rst.
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#ifndef mozilla_Preferences_h
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#define mozilla_Preferences_h
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#ifndef MOZILLA_INTERNAL_API
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# error "This header is only usable from within libxul (MOZILLA_INTERNAL_API)."
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#endif
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#include "mozilla/Atomics.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/MozPromise.h"
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#include "mozilla/StaticPtr.h"
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#include "mozilla/ipc/SharedMemory.h"
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#include "nsCOMPtr.h"
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#include "nsIObserver.h"
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#include "nsIPrefBranch.h"
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#include "nsIPrefService.h"
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#include "nsString.h"
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#include "nsTArray.h"
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#include "nsWeakReference.h"
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#include "nsXULAppAPI.h"
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#include <atomic>
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#include <functional>
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class nsIFile;
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// The callback function will get passed the pref name which triggered the call
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// and the void* data which was passed to the registered callback function.
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typedef void (*PrefChangedFunc)(const char* aPref, void* aData);
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class nsPrefBranch;
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namespace mozilla {
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struct RegisterCallbacksInternal;
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void UnloadPrefsModule();
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class PreferenceServiceReporter;
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namespace dom {
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class Pref;
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class PrefValue;
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} // namespace dom
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namespace ipc {
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class FileDescriptor;
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} // namespace ipc
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struct PrefsSizes;
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// Xlib.h defines Bool as a macro constant. Don't try to define this enum if
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// it's already been included.
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#ifndef Bool
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// Keep this in sync with PrefType in parser/src/lib.rs.
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enum class PrefType : uint8_t {
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None = 0, // only used when neither the default nor user value is set
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String = 1,
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Int = 2,
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Bool = 3,
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};
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#endif
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#ifdef XP_UNIX
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// We need to send two shared memory descriptors to every child process:
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//
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// 1) A read-only/write-protected snapshot of the initial state of the
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// preference database. This memory is shared between all processes, and
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// therefore cannot be modified once it has been created.
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//
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// 2) A set of changes on top of the snapshot, containing the current values of
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// all preferences which have changed since it was created.
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//
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// Since the second set will be different for every process, and the first set
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// cannot be modified, it is unfortunately not possible to combine them into a
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// single file descriptor.
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//
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// XXX: bug 1440207 is about improving how fixed fds such as this are used.
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static const int kPrefsFileDescriptor = 8;
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static const int kPrefMapFileDescriptor = 9;
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#endif
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// Keep this in sync with PrefType in parser/src/lib.rs.
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enum class PrefValueKind : uint8_t { Default, User };
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class Preferences final : public nsIPrefService,
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public nsIObserver,
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public nsIPrefBranch,
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public nsSupportsWeakReference {
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friend class ::nsPrefBranch;
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public:
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using WritePrefFilePromise = MozPromise<bool, nsresult, false>;
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIPREFSERVICE
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NS_FORWARD_NSIPREFBRANCH(mRootBranch->)
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NS_DECL_NSIOBSERVER
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Preferences();
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// Returns true if the Preferences service is available, false otherwise.
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static bool IsServiceAvailable();
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// Initialize user prefs from prefs.js/user.js
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static void InitializeUserPrefs();
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static void FinishInitializingUserPrefs();
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// Returns the singleton instance which is addreffed.
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static already_AddRefed<Preferences> GetInstanceForService();
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// Finallizes global members.
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static void Shutdown();
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// Returns shared pref service instance NOTE: not addreffed.
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static nsIPrefService* GetService() {
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NS_ENSURE_TRUE(InitStaticMembers(), nullptr);
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return sPreferences;
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}
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// Returns shared pref branch instance. NOTE: not addreffed.
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static nsIPrefBranch* GetRootBranch(
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PrefValueKind aKind = PrefValueKind::User) {
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NS_ENSURE_TRUE(InitStaticMembers(), nullptr);
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return (aKind == PrefValueKind::Default) ? sPreferences->mDefaultRootBranch
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: sPreferences->mRootBranch;
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}
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// Gets the type of the pref.
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static int32_t GetType(const char* aPrefName);
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// Fallible value getters. When `aKind` is `User` they will get the user
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// value if possible, and fall back to the default value otherwise.
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static nsresult GetBool(const char* aPrefName, bool* aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetInt(const char* aPrefName, int32_t* aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetUint(const char* aPrefName, uint32_t* aResult,
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PrefValueKind aKind = PrefValueKind::User) {
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return GetInt(aPrefName, reinterpret_cast<int32_t*>(aResult), aKind);
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}
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static nsresult GetFloat(const char* aPrefName, float* aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetCString(const char* aPrefName, nsACString& aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetString(const char* aPrefName, nsAString& aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetLocalizedCString(
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const char* aPrefName, nsACString& aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetLocalizedString(const char* aPrefName, nsAString& aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetComplex(const char* aPrefName, const nsIID& aType,
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void** aResult,
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PrefValueKind aKind = PrefValueKind::User);
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// Infallible getters of user or default values, with fallback results on
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// failure. When `aKind` is `User` they will get the user value if possible,
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// and fall back to the default value otherwise.
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static bool GetBool(const char* aPrefName, bool aFallback = false,
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PrefValueKind aKind = PrefValueKind::User);
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static int32_t GetInt(const char* aPrefName, int32_t aFallback = 0,
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PrefValueKind aKind = PrefValueKind::User);
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static uint32_t GetUint(const char* aPrefName, uint32_t aFallback = 0,
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PrefValueKind aKind = PrefValueKind::User);
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static float GetFloat(const char* aPrefName, float aFallback = 0.0f,
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PrefValueKind aKind = PrefValueKind::User);
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// Value setters. These fail if run outside the parent process.
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static nsresult SetBool(const char* aPrefName, bool aValue,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult SetInt(const char* aPrefName, int32_t aValue,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult SetCString(const char* aPrefName, const nsACString& aValue,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult SetUint(const char* aPrefName, uint32_t aValue,
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PrefValueKind aKind = PrefValueKind::User) {
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return SetInt(aPrefName, static_cast<int32_t>(aValue), aKind);
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}
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static nsresult SetFloat(const char* aPrefName, float aValue,
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PrefValueKind aKind = PrefValueKind::User) {
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nsAutoCString value;
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value.AppendFloat(aValue);
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return SetCString(aPrefName, value, aKind);
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}
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static nsresult SetCString(const char* aPrefName, const char* aValue,
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PrefValueKind aKind = PrefValueKind::User) {
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return Preferences::SetCString(aPrefName, nsDependentCString(aValue),
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aKind);
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}
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static nsresult SetString(const char* aPrefName, const char16ptr_t aValue,
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PrefValueKind aKind = PrefValueKind::User) {
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return Preferences::SetCString(aPrefName, NS_ConvertUTF16toUTF8(aValue),
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aKind);
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}
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static nsresult SetString(const char* aPrefName, const nsAString& aValue,
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PrefValueKind aKind = PrefValueKind::User) {
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return Preferences::SetCString(aPrefName, NS_ConvertUTF16toUTF8(aValue),
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aKind);
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}
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static nsresult SetComplex(const char* aPrefName, const nsIID& aType,
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nsISupports* aValue,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult Lock(const char* aPrefName);
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static nsresult Unlock(const char* aPrefName);
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static bool IsLocked(const char* aPrefName);
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static bool IsSanitized(const char* aPrefName);
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// Clears user set pref. Fails if run outside the parent process.
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static nsresult ClearUser(const char* aPrefName);
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// Whether the pref has a user value or not.
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static bool HasUserValue(const char* aPref);
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// Whether the pref has a user value or not.
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static bool HasDefaultValue(const char* aPref);
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// Adds/Removes the observer for the root pref branch. See nsIPrefBranch.idl
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// for details.
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static nsresult AddStrongObserver(nsIObserver* aObserver,
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const nsACString& aPref);
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static nsresult AddWeakObserver(nsIObserver* aObserver,
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const nsACString& aPref);
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static nsresult RemoveObserver(nsIObserver* aObserver,
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const nsACString& aPref);
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template <int N>
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static nsresult AddStrongObserver(nsIObserver* aObserver,
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const char (&aPref)[N]) {
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return AddStrongObserver(aObserver, nsLiteralCString(aPref));
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}
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template <int N>
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static nsresult AddWeakObserver(nsIObserver* aObserver,
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const char (&aPref)[N]) {
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return AddWeakObserver(aObserver, nsLiteralCString(aPref));
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}
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template <int N>
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static nsresult RemoveObserver(nsIObserver* aObserver,
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const char (&aPref)[N]) {
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return RemoveObserver(aObserver, nsLiteralCString(aPref));
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}
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// Adds/Removes two or more observers for the root pref branch. Pass to
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// aPrefs an array of const char* whose last item is nullptr.
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// Note: All preference strings *must* be statically-allocated string
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// literals.
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static nsresult AddStrongObservers(nsIObserver* aObserver,
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const char* const* aPrefs);
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static nsresult AddWeakObservers(nsIObserver* aObserver,
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const char* const* aPrefs);
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static nsresult RemoveObservers(nsIObserver* aObserver,
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const char* const* aPrefs);
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// Registers/Unregisters the callback function for the aPref.
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template <typename T = void>
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static nsresult RegisterCallback(PrefChangedFunc aCallback,
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const nsACString& aPref,
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T* aClosure = nullptr) {
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return RegisterCallback(aCallback, aPref, aClosure, ExactMatch);
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}
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template <typename T = void>
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static nsresult UnregisterCallback(PrefChangedFunc aCallback,
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const nsACString& aPref,
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T* aClosure = nullptr) {
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return UnregisterCallback(aCallback, aPref, aClosure, ExactMatch);
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}
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// Like RegisterCallback, but also calls the callback immediately for
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// initialization.
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template <typename T = void>
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static nsresult RegisterCallbackAndCall(PrefChangedFunc aCallback,
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const nsACString& aPref,
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T* aClosure = nullptr) {
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return RegisterCallbackAndCall(aCallback, aPref, aClosure, ExactMatch);
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}
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// Like RegisterCallback, but registers a callback for a prefix of multiple
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// pref names, not a single pref name.
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template <typename T = void>
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static nsresult RegisterPrefixCallback(PrefChangedFunc aCallback,
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const nsACString& aPref,
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T* aClosure = nullptr) {
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return RegisterCallback(aCallback, aPref, aClosure, PrefixMatch);
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}
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// Like RegisterPrefixCallback, but also calls the callback immediately for
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// initialization.
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template <typename T = void>
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static nsresult RegisterPrefixCallbackAndCall(PrefChangedFunc aCallback,
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const nsACString& aPref,
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T* aClosure = nullptr) {
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return RegisterCallbackAndCall(aCallback, aPref, aClosure, PrefixMatch);
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}
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// Unregister a callback registered with RegisterPrefixCallback or
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// RegisterPrefixCallbackAndCall.
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template <typename T = void>
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static nsresult UnregisterPrefixCallback(PrefChangedFunc aCallback,
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const nsACString& aPref,
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T* aClosure = nullptr) {
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return UnregisterCallback(aCallback, aPref, aClosure, PrefixMatch);
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}
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// Variants of the above which register a single callback to handle multiple
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// preferences.
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//
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// The array of preference names must be null terminated. It may be
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// dynamically allocated, but the caller is responsible for keeping it alive
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// until the callback is unregistered.
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//
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// Also note that the exact same aPrefs pointer must be passed to the
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// Unregister call as was passed to the Register call.
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template <typename T = void>
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static nsresult RegisterCallbacks(PrefChangedFunc aCallback,
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const char* const* aPrefs,
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T* aClosure = nullptr) {
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return RegisterCallbacks(aCallback, aPrefs, aClosure, ExactMatch);
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}
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static nsresult RegisterCallbacksAndCall(PrefChangedFunc aCallback,
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const char* const* aPrefs,
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void* aClosure = nullptr);
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template <typename T = void>
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static nsresult UnregisterCallbacks(PrefChangedFunc aCallback,
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const char* const* aPrefs,
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T* aClosure = nullptr) {
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return UnregisterCallbacks(aCallback, aPrefs, aClosure, ExactMatch);
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}
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template <typename T = void>
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static nsresult RegisterPrefixCallbacks(PrefChangedFunc aCallback,
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const char* const* aPrefs,
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T* aClosure = nullptr) {
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return RegisterCallbacks(aCallback, aPrefs, aClosure, PrefixMatch);
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}
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template <typename T = void>
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static nsresult UnregisterPrefixCallbacks(PrefChangedFunc aCallback,
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const char* const* aPrefs,
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T* aClosure = nullptr) {
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return UnregisterCallbacks(aCallback, aPrefs, aClosure, PrefixMatch);
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}
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template <int N, typename T = void>
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static nsresult RegisterCallback(PrefChangedFunc aCallback,
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const char (&aPref)[N],
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T* aClosure = nullptr) {
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return RegisterCallback(aCallback, nsLiteralCString(aPref), aClosure,
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ExactMatch);
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}
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template <int N, typename T = void>
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static nsresult UnregisterCallback(PrefChangedFunc aCallback,
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const char (&aPref)[N],
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T* aClosure = nullptr) {
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return UnregisterCallback(aCallback, nsLiteralCString(aPref), aClosure,
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ExactMatch);
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}
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template <int N, typename T = void>
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static nsresult RegisterCallbackAndCall(PrefChangedFunc aCallback,
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const char (&aPref)[N],
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T* aClosure = nullptr) {
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return RegisterCallbackAndCall(aCallback, nsLiteralCString(aPref), aClosure,
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ExactMatch);
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}
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template <int N, typename T = void>
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static nsresult RegisterPrefixCallback(PrefChangedFunc aCallback,
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const char (&aPref)[N],
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T* aClosure = nullptr) {
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return RegisterCallback(aCallback, nsLiteralCString(aPref), aClosure,
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PrefixMatch);
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}
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template <int N, typename T = void>
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static nsresult RegisterPrefixCallbackAndCall(PrefChangedFunc aCallback,
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const char (&aPref)[N],
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T* aClosure = nullptr) {
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return RegisterCallbackAndCall(aCallback, nsLiteralCString(aPref), aClosure,
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PrefixMatch);
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}
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template <int N, typename T = void>
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static nsresult UnregisterPrefixCallback(PrefChangedFunc aCallback,
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const char (&aPref)[N],
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T* aClosure = nullptr) {
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return UnregisterCallback(aCallback, nsLiteralCString(aPref), aClosure,
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PrefixMatch);
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}
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// When a content process is created these methods are used to pass changed
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// prefs in bulk from the parent process, via shared memory.
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static void SerializePreferences(nsCString& aStr,
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bool aIsDestinationWebContentProcess);
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static void DeserializePreferences(char* aStr, size_t aPrefsLen);
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#ifndef RUST_BINDGEN
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static mozilla::ipc::SharedMemoryHandle EnsureSnapshot(size_t* aSize);
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static void InitSnapshot(const mozilla::ipc::SharedMemoryHandle&,
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size_t aSize);
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#endif
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// When a single pref is changed in the parent process, these methods are
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// used to pass the update to content processes.
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static void GetPreference(dom::Pref* aPref,
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const GeckoProcessType aDestinationProcessType,
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const nsACString& aDestinationRemoteType);
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static void SetPreference(const dom::Pref& aPref);
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#ifdef DEBUG
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static bool ArePrefsInitedInContentProcess();
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#endif
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static void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
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PrefsSizes& aSizes);
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static void HandleDirty();
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// Explicitly choosing synchronous or asynchronous (if allowed) preferences
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// file write. Only for the default file. The guarantee for the "blocking"
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// is that when it returns, the file on disk reflect the current state of
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// preferences.
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nsresult SavePrefFileBlocking();
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nsresult SavePrefFileAsynchronous();
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// If this is false, only blocking writes, on main thread are allowed.
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bool AllowOffMainThreadSave();
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private:
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virtual ~Preferences();
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nsresult NotifyServiceObservers(const char* aSubject);
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// Loads the prefs.js file from the profile, or creates a new one. Returns
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// the prefs file if successful, or nullptr on failure.
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already_AddRefed<nsIFile> ReadSavedPrefs();
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// Loads the user.js file from the profile if present.
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void ReadUserOverridePrefs();
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nsresult MakeBackupPrefFile(nsIFile* aFile);
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// Default pref file save can be blocking or not.
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enum class SaveMethod { Blocking, Asynchronous };
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// Off main thread is only respected for the default aFile value (nullptr).
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nsresult SavePrefFileInternal(nsIFile* aFile, SaveMethod aSaveMethod);
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nsresult WritePrefFile(
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nsIFile* aFile, SaveMethod aSaveMethod,
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UniquePtr<MozPromiseHolder<WritePrefFilePromise>> aPromise = nullptr);
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nsresult ResetUserPrefs();
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// Helpers for implementing
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// Register(Prefix)Callback/Unregister(Prefix)Callback.
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public:
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// Public so the ValueObserver classes can use it.
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enum MatchKind {
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PrefixMatch,
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ExactMatch,
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};
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private:
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static void SetupTelemetryPref();
|
|
static nsresult InitInitialObjects(bool aIsStartup);
|
|
|
|
friend struct Internals;
|
|
|
|
static nsresult RegisterCallback(PrefChangedFunc aCallback,
|
|
const nsACString& aPref, void* aClosure,
|
|
MatchKind aMatchKind,
|
|
bool aIsPriority = false);
|
|
static nsresult UnregisterCallback(PrefChangedFunc aCallback,
|
|
const nsACString& aPref, void* aClosure,
|
|
MatchKind aMatchKind);
|
|
static nsresult RegisterCallbackAndCall(PrefChangedFunc aCallback,
|
|
const nsACString& aPref,
|
|
void* aClosure, MatchKind aMatchKind);
|
|
|
|
static nsresult RegisterCallbacks(PrefChangedFunc aCallback,
|
|
const char* const* aPrefs, void* aClosure,
|
|
MatchKind aMatchKind);
|
|
static nsresult UnregisterCallbacks(PrefChangedFunc aCallback,
|
|
const char* const* aPrefs, void* aClosure,
|
|
MatchKind aMatchKind);
|
|
|
|
template <typename T>
|
|
static nsresult RegisterCallbackImpl(PrefChangedFunc aCallback, T& aPref,
|
|
void* aClosure, MatchKind aMatchKind,
|
|
bool aIsPriority = false);
|
|
template <typename T>
|
|
static nsresult UnregisterCallbackImpl(PrefChangedFunc aCallback, T& aPref,
|
|
void* aClosure, MatchKind aMatchKind);
|
|
|
|
static nsresult RegisterCallback(PrefChangedFunc aCallback, const char* aPref,
|
|
void* aClosure, MatchKind aMatchKind,
|
|
bool aIsPriority = false) {
|
|
return RegisterCallback(aCallback, nsDependentCString(aPref), aClosure,
|
|
aMatchKind, aIsPriority);
|
|
}
|
|
static nsresult UnregisterCallback(PrefChangedFunc aCallback,
|
|
const char* aPref, void* aClosure,
|
|
MatchKind aMatchKind) {
|
|
return UnregisterCallback(aCallback, nsDependentCString(aPref), aClosure,
|
|
aMatchKind);
|
|
}
|
|
static nsresult RegisterCallbackAndCall(PrefChangedFunc aCallback,
|
|
const char* aPref, void* aClosure,
|
|
MatchKind aMatchKind) {
|
|
return RegisterCallbackAndCall(aCallback, nsDependentCString(aPref),
|
|
aClosure, aMatchKind);
|
|
}
|
|
|
|
private:
|
|
nsCOMPtr<nsIFile> mCurrentFile;
|
|
// Time since unix epoch in ms (JS Date compatible)
|
|
PRTime mUserPrefsFileLastModifiedAtStartup = 0;
|
|
bool mDirty = false;
|
|
bool mProfileShutdown = false;
|
|
// We wait a bit after prefs are dirty before writing them. In this period,
|
|
// mDirty and mSavePending will both be true.
|
|
bool mSavePending = false;
|
|
|
|
nsCOMPtr<nsIPrefBranch> mRootBranch;
|
|
nsCOMPtr<nsIPrefBranch> mDefaultRootBranch;
|
|
|
|
static StaticRefPtr<Preferences> sPreferences;
|
|
static bool sShutdown;
|
|
|
|
// Init static members. Returns true on success.
|
|
static bool InitStaticMembers();
|
|
};
|
|
|
|
extern Atomic<bool, Relaxed> sOmitBlocklistedPrefValues;
|
|
extern Atomic<bool, Relaxed> sCrashOnBlocklistedPref;
|
|
|
|
bool IsPreferenceSanitized(const char* aPref);
|
|
|
|
const char kFissionEnforceBlockList[] =
|
|
"fission.enforceBlocklistedPrefsInSubprocesses";
|
|
const char kFissionOmitBlockListValues[] =
|
|
"fission.omitBlocklistedPrefsInSubprocesses";
|
|
|
|
void OnFissionBlocklistPrefChange(const char* aPref, void* aData);
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_Preferences_h
|