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17578086c0
MozReview-Commit-ID: EMCgMRTDqDn --HG-- extra : rebase_source : 11731e5a7c53c725396a9c8b46f116071d0c6e31
609 lines
23 KiB
C++
609 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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#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/Result.h"
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#include "mozilla/StaticPtr.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 "nsPrintfCString.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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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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namespace dom {
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class Pref;
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class PrefValue;
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} // namespace dom
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struct PrefsSizes;
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#ifdef XP_UNIX
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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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#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
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{
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Default,
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User
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};
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class Preferences final
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: public nsIPrefService
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, public nsIObserver
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, public nsIPrefBranch
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, public nsSupportsWeakReference
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{
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friend class ::nsPrefBranch;
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public:
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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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// 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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{
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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(PrefValueKind aKind = PrefValueKind::User)
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{
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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,
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bool* aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetInt(const char* aPrefName,
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int32_t* aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetUint(const char* aPrefName,
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uint32_t* aResult,
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PrefValueKind aKind = PrefValueKind::User)
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{
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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,
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float* aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetCString(const char* aPrefName,
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nsACString& aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetString(const char* aPrefName,
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nsAString& aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetLocalizedCString(
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const char* aPrefName,
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nsACString& aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetLocalizedString(const char* aPrefName,
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nsAString& aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetComplex(const char* aPrefName,
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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,
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bool aFallback = false,
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PrefValueKind aKind = PrefValueKind::User)
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{
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bool result = aFallback;
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GetBool(aPrefName, &result, aKind);
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return result;
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}
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static int32_t GetInt(const char* aPrefName,
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int32_t aFallback = 0,
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PrefValueKind aKind = PrefValueKind::User)
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{
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int32_t result = aFallback;
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GetInt(aPrefName, &result, aKind);
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return result;
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}
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static uint32_t GetUint(const char* aPrefName,
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uint32_t aFallback = 0,
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PrefValueKind aKind = PrefValueKind::User)
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{
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uint32_t result = aFallback;
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GetUint(aPrefName, &result, aKind);
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return result;
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}
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static float GetFloat(const char* aPrefName,
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float aFallback = 0.0f,
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PrefValueKind aKind = PrefValueKind::User)
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{
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float result = aFallback;
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GetFloat(aPrefName, &result, aKind);
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return result;
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}
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// Value setters. These fail if run outside the parent process.
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static nsresult SetBool(const char* aPrefName,
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bool aValue,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult SetInt(const char* aPrefName,
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int32_t aValue,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult SetCString(const char* aPrefName,
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const nsACString& aValue,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult SetUint(const char* aPrefName,
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uint32_t aValue,
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PrefValueKind aKind = PrefValueKind::User)
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{
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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,
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float aValue,
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PrefValueKind aKind = PrefValueKind::User)
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{
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return SetCString(aPrefName, nsPrintfCString("%f", aValue), aKind);
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}
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static nsresult SetCString(const char* aPrefName,
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const char* aValue,
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PrefValueKind aKind = PrefValueKind::User)
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{
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return Preferences::SetCString(
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aPrefName, nsDependentCString(aValue), aKind);
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}
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static nsresult SetString(const char* aPrefName,
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const char16ptr_t aValue,
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PrefValueKind aKind = PrefValueKind::User)
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{
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return Preferences::SetCString(
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aPrefName, NS_ConvertUTF16toUTF8(aValue), aKind);
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}
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static nsresult SetString(const char* aPrefName,
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const nsAString& aValue,
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PrefValueKind aKind = PrefValueKind::User)
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{
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return Preferences::SetCString(
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aPrefName, NS_ConvertUTF16toUTF8(aValue), aKind);
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}
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static nsresult SetComplex(const char* aPrefName,
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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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// 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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// 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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{
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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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{
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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, const char (&aPref)[N])
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{
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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** aPrefs);
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static nsresult AddWeakObservers(nsIObserver* aObserver, const char** aPrefs);
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static nsresult RemoveObservers(nsIObserver* aObserver, const char** aPrefs);
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// Registers/Unregisters the callback function for the aPref.
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static nsresult RegisterCallback(PrefChangedFunc aCallback,
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const nsACString& aPref,
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void* aClosure = nullptr)
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{
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return RegisterCallback(aCallback, aPref, aClosure, ExactMatch);
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}
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static nsresult UnregisterCallback(PrefChangedFunc aCallback,
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const nsACString& aPref,
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void* aClosure = nullptr)
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{
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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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static nsresult RegisterCallbackAndCall(PrefChangedFunc aCallback,
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const nsACString& aPref,
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void* aClosure = nullptr)
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{
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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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static nsresult RegisterPrefixCallback(PrefChangedFunc aCallback,
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const nsACString& aPref,
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void* aClosure = nullptr)
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{
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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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static nsresult RegisterPrefixCallbackAndCall(PrefChangedFunc aCallback,
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const nsACString& aPref,
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void* aClosure = nullptr)
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{
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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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static nsresult UnregisterPrefixCallback(PrefChangedFunc aCallback,
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const nsACString& aPref,
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void* aClosure = nullptr)
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{
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return UnregisterCallback(aCallback, aPref, aClosure, PrefixMatch);
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}
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template<int N>
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static nsresult RegisterCallback(PrefChangedFunc aCallback,
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const char (&aPref)[N],
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void* aClosure = nullptr)
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{
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return RegisterCallback(
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aCallback, nsLiteralCString(aPref), aClosure, ExactMatch);
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}
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template<int N>
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static nsresult UnregisterCallback(PrefChangedFunc aCallback,
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const char (&aPref)[N],
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void* aClosure = nullptr)
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{
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return UnregisterCallback(
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aCallback, nsLiteralCString(aPref), aClosure, ExactMatch);
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}
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template<int N>
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static nsresult RegisterCallbackAndCall(PrefChangedFunc aCallback,
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const char (&aPref)[N],
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void* aClosure = nullptr)
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{
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return RegisterCallbackAndCall(
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aCallback, nsLiteralCString(aPref), aClosure, ExactMatch);
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}
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template<int N>
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static nsresult RegisterPrefixCallback(PrefChangedFunc aCallback,
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const char (&aPref)[N],
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void* aClosure = nullptr)
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{
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return RegisterCallback(
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aCallback, nsLiteralCString(aPref), aClosure, PrefixMatch);
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}
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template<int N>
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static nsresult RegisterPrefixCallbackAndCall(PrefChangedFunc aCallback,
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const char (&aPref)[N],
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void* aClosure = nullptr)
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{
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return RegisterCallbackAndCall(
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aCallback, nsLiteralCString(aPref), aClosure, PrefixMatch);
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}
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template<int N>
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static nsresult UnregisterPrefixCallback(PrefChangedFunc aCallback,
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const char (&aPref)[N],
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void* aClosure = nullptr)
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{
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return UnregisterCallback(
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aCallback, nsLiteralCString(aPref), aClosure, PrefixMatch);
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}
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// Adds the aVariable to cache table. |aVariable| must be a pointer for a
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// static variable. The value will be modified when the pref value is changed
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// but note that even if you modified it, the value isn't assigned to the
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// pref.
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static nsresult AddBoolVarCache(bool* aVariable,
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const nsACString& aPref,
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bool aDefault = false,
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bool aSkipAssignment = false);
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template<MemoryOrdering Order>
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static nsresult AddAtomicBoolVarCache(Atomic<bool, Order>* aVariable,
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const nsACString& aPref,
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bool aDefault = false,
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bool aSkipAssignment = false);
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static nsresult AddIntVarCache(int32_t* aVariable,
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const nsACString& aPref,
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int32_t aDefault = 0,
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bool aSkipAssignment = false);
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template<MemoryOrdering Order>
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static nsresult AddAtomicIntVarCache(Atomic<int32_t, Order>* aVariable,
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const nsACString& aPref,
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int32_t aDefault = 0,
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bool aSkipAssignment = false);
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static nsresult AddUintVarCache(uint32_t* aVariable,
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const nsACString& aPref,
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uint32_t aDefault = 0,
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bool aSkipAssignment = false);
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template<MemoryOrdering Order>
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static nsresult AddAtomicUintVarCache(Atomic<uint32_t, Order>* aVariable,
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const nsACString& aPref,
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uint32_t aDefault = 0,
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bool aSkipAssignment = false);
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static nsresult AddFloatVarCache(float* aVariable,
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const nsACString& aPref,
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float aDefault = 0.0f,
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bool aSkipAssignment = false);
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template<int N>
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static nsresult AddBoolVarCache(bool* aVariable,
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const char (&aPref)[N],
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bool aDefault = false,
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bool aSkipAssignment = false)
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{
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return AddBoolVarCache(
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aVariable, nsLiteralCString(aPref), aDefault, aSkipAssignment);
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}
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template<MemoryOrdering Order, int N>
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static nsresult AddAtomicBoolVarCache(Atomic<bool, Order>* aVariable,
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const char (&aPref)[N],
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bool aDefault = false,
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bool aSkipAssignment = false)
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{
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return AddAtomicBoolVarCache<Order>(
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aVariable, nsLiteralCString(aPref), aDefault, aSkipAssignment);
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}
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template<int N>
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static nsresult AddIntVarCache(int32_t* aVariable,
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const char (&aPref)[N],
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int32_t aDefault = 0,
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bool aSkipAssignment = false)
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{
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return AddIntVarCache(
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aVariable, nsLiteralCString(aPref), aDefault, aSkipAssignment);
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}
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template<MemoryOrdering Order, int N>
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static nsresult AddAtomicIntVarCache(Atomic<int32_t, Order>* aVariable,
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const char (&aPref)[N],
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int32_t aDefault = 0,
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bool aSkipAssignment = false)
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{
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return AddAtomicIntVarCache<Order>(
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aVariable, nsLiteralCString(aPref), aDefault, aSkipAssignment);
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}
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template<int N>
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static nsresult AddUintVarCache(uint32_t* aVariable,
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const char (&aPref)[N],
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uint32_t aDefault = 0,
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bool aSkipAssignment = false)
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{
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return AddUintVarCache(
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aVariable, nsLiteralCString(aPref), aDefault, aSkipAssignment);
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}
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template<MemoryOrdering Order, int N>
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static nsresult AddAtomicUintVarCache(Atomic<uint32_t, Order>* aVariable,
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const char (&aPref)[N],
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uint32_t aDefault = 0,
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bool aSkipAssignment = false)
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{
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return AddAtomicUintVarCache<Order>(
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aVariable, nsLiteralCString(aPref), aDefault, aSkipAssignment);
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}
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template<int N>
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static nsresult AddFloatVarCache(float* aVariable,
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const char (&aPref)[N],
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float aDefault = 0.0f,
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bool aSkipAssignment = false)
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{
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return AddFloatVarCache(
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aVariable, nsLiteralCString(aPref), aDefault, aSkipAssignment);
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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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static void DeserializePreferences(char* aStr, size_t aPrefsLen);
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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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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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|
|
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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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|
|
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// Loads the user.js file from the profile if present.
|
|
void ReadUserOverridePrefs();
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|
|
|
nsresult MakeBackupPrefFile(nsIFile* aFile);
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|
|
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// Default pref file save can be blocking or not.
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|
enum class SaveMethod
|
|
{
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|
Blocking,
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|
Asynchronous
|
|
};
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|
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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(nsIFile* aFile, SaveMethod aSaveMethod);
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|
|
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// If this is false, only blocking writes, on main thread are allowed.
|
|
bool AllowOffMainThreadSave();
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|
|
|
// Helpers for implementing
|
|
// Register(Prefix)Callback/Unregister(Prefix)Callback.
|
|
public:
|
|
// Public so the ValueObserver classes can use it.
|
|
enum MatchKind
|
|
{
|
|
PrefixMatch,
|
|
ExactMatch,
|
|
};
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|
|
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private:
|
|
static void SetupTelemetryPref();
|
|
static mozilla::Result<mozilla::Ok, const char*> InitInitialObjects(
|
|
bool aIsStartup);
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|
|
|
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 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;
|
|
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();
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_Preferences_h
|