livetrax/libs/appleutility/CoreAudio/PublicUtility/CASettingsStorage.cpp

/*
     File: CASettingsStorage.cpp
 Abstract: CASettingsStorage.h
  Version: 1.1
 
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 redistribute this Apple software.
 
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 license, under Apple's copyrights in this original Apple software (the
 "Apple Software"), to use, reproduce, modify and redistribute the Apple
 Software, with or without modifications, in source and/or binary forms;
 provided that if you redistribute the Apple Software in its entirety and
 without modifications, you must retain this notice and the following
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 Neither the name, trademarks, service marks or logos of Apple Inc. may
 be used to endorse or promote products derived from the Apple Software
 without specific prior written permission from Apple.  Except as
 expressly stated in this notice, no other rights or licenses, express or
 implied, are granted by Apple herein, including but not limited to any
 patent rights that may be infringed by your derivative works or by other
 works in which the Apple Software may be incorporated.
 
 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE
 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
 THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
 
 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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 POSSIBILITY OF SUCH DAMAGE.
 
 Copyright (C) 2014 Apple Inc. All Rights Reserved.
 
*/
//==================================================================================================
//	Includes
//==================================================================================================

//	Self Include
#include "CASettingsStorage.h"

//	PublicUtility Includes
#include "CAAutoDisposer.h"
#include "CACFArray.h"
#include "CACFData.h"
#include "CACFDictionary.h"
#include "CACFDistributedNotification.h"
#include "CACFNumber.h"

//	Stamdard Library Includes
#include <string.h>
#include <sys/fcntl.h>

//==================================================================================================
//	CASettingsStorage
//==================================================================================================

CASettingsStorage::CASettingsStorage(const char* inSettingsFilePath, mode_t inSettingsFileAccessMode, CFPropertyListFormat inSettingsCacheFormat, bool inIsSingleProcessOnly, bool inIsReadOnly)
:
	mSettingsFilePath(NULL),
	mSettingsFileAccessMode(inSettingsFileAccessMode),
	mSettingsCache(CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks)),
	mSettingsCacheFormat(inSettingsCacheFormat),
	mSettingsCacheTime(),
	mSettingsCacheForceRefresh(true),
	mIsSingleProcessOnly(inIsSingleProcessOnly),
	mIsReadOnly(inIsReadOnly)
{
	size_t theLength = strlen(inSettingsFilePath);
	mSettingsFilePath = new char[theLength + 2];
	strlcpy(mSettingsFilePath, inSettingsFilePath, theLength + 2);
	
	mSettingsCacheTime.tv_sec = 0;
	mSettingsCacheTime.tv_nsec = 0;
	
	mSettingsCacheForceRefresh = true;
}

CASettingsStorage::~CASettingsStorage()
{
	delete[] mSettingsFilePath;
	
	if(mSettingsCache != NULL)
	{
		CFRelease(mSettingsCache);
	}
}

UInt32	CASettingsStorage::GetNumberKeys() const
{
	//	make sure our cache is up to date
	const_cast<CASettingsStorage*>(this)->RefreshSettings();

	return ToUInt32(CFDictionaryGetCount(mSettingsCache));
}

void	CASettingsStorage::GetKeys(UInt32 inNumberKeys, UInt32& outNumberKeys, CFStringRef* outKeys) const
{
	//	make sure our cache is up to date
	const_cast<CASettingsStorage*>(this)->RefreshSettings();

	CFDictionaryGetKeysAndValues(mSettingsCache, reinterpret_cast<const void**>(outKeys), NULL);
	outNumberKeys = inNumberKeys;
}

void	CASettingsStorage::CopyBoolValue(CFStringRef inKey, bool& outValue, bool inDefaultValue) const
{
	//	initialize the return value
	outValue = inDefaultValue;
	
	//	get the raw value
	CFTypeRef theValue = NULL;
	CopyCFTypeValue(inKey, theValue, NULL);
	
	//	for this type, NULL is an invalid value
	if(theValue != NULL)
	{
		//	bools can be made from either CFBooleans or CFNumbers
		if(CFGetTypeID(theValue) == CFBooleanGetTypeID())
		{
			//	get the return value from the CF object
			outValue = CFBooleanGetValue(static_cast<CFBooleanRef>(theValue));
		}
		else if(CFGetTypeID(theValue) == CFNumberGetTypeID())
		{
			//	get the numeric value
			SInt32 theNumericValue = 0;
			CFNumberGetValue(static_cast<CFNumberRef>(theValue), kCFNumberSInt32Type, &theNumericValue);
			
			//	non-zero indicates true
			outValue = theNumericValue != 0;
		}
		
		//	release the value since we aren't returning it
		CFRelease(theValue);
	}
}

void	CASettingsStorage::CopySInt32Value(CFStringRef inKey, SInt32& outValue, SInt32 inDefaultValue) const
{
	//	initialize the return value
	outValue = inDefaultValue;
	
	//	get the raw value
	CFTypeRef theValue = NULL;
	CopyCFTypeValue(inKey, theValue, NULL);
	
	//	for this type, NULL is an invalid value
	if(theValue != NULL)
	{
		//	make sure we are dealing with the right kind of CF object
		if(CFGetTypeID(theValue) == CFNumberGetTypeID())
		{
			//	get the return value from the CF object
			CFNumberGetValue(static_cast<CFNumberRef>(theValue), kCFNumberSInt32Type, &outValue);
		}
		
		//	release the value since we aren't returning it
		CFRelease(theValue);
	}
}

void	CASettingsStorage::CopyUInt32Value(CFStringRef inKey, UInt32& outValue, UInt32 inDefaultValue) const
{
	//	initialize the return value
	outValue = inDefaultValue;
	
	//	get the raw value
	CFTypeRef theValue = NULL;
	CopyCFTypeValue(inKey, theValue, NULL);
	
	//	for this type, NULL is an invalid value
	if(theValue != NULL)
	{
		//	make sure we are dealing with the right kind of CF object
		if(CFGetTypeID(theValue) == CFNumberGetTypeID())
		{
			//	get the return value from the CF object
			CFNumberGetValue(static_cast<CFNumberRef>(theValue), kCFNumberSInt32Type, &outValue);
		}
		
		//	release the value since we aren't returning it
		CFRelease(theValue);
	}
}

void	CASettingsStorage::CopySInt64Value(CFStringRef inKey, SInt64& outValue, SInt64 inDefaultValue) const
{
	//	initialize the return value
	outValue = inDefaultValue;
	
	//	get the raw value
	CFTypeRef theValue = NULL;
	CopyCFTypeValue(inKey, theValue, NULL);
	
	//	for this type, NULL is an invalid value
	if(theValue != NULL)
	{
		//	make sure we are dealing with the right kind of CF object
		if(CFGetTypeID(theValue) == CFNumberGetTypeID())
		{
			//	get the return value from the CF object
			CFNumberGetValue(static_cast<CFNumberRef>(theValue), kCFNumberSInt64Type, &outValue);
		}
		
		//	release the value since we aren't returning it
		CFRelease(theValue);
	}
}

void	CASettingsStorage::CopyUInt64Value(CFStringRef inKey, UInt64& outValue, UInt64 inDefaultValue) const
{
	//	initialize the return value
	outValue = inDefaultValue;
	
	//	get the raw value
	CFTypeRef theValue = NULL;
	CopyCFTypeValue(inKey, theValue, NULL);
	
	//	for this type, NULL is an invalid value
	if(theValue != NULL)
	{
		//	make sure we are dealing with the right kind of CF object
		if(CFGetTypeID(theValue) == CFNumberGetTypeID())
		{
			//	get the return value from the CF object
			CFNumberGetValue(static_cast<CFNumberRef>(theValue), kCFNumberSInt64Type, &outValue);
		}
		
		//	release the value since we aren't returning it
		CFRelease(theValue);
	}
}

void	CASettingsStorage::CopyFloat32Value(CFStringRef inKey, Float32& outValue, Float32 inDefaultValue) const
{
	//	initialize the return value
	outValue = inDefaultValue;
	
	//	get the raw value
	CFTypeRef theValue = NULL;
	CopyCFTypeValue(inKey, theValue, NULL);
	
	//	for this type, NULL is an invalid value
	if(theValue != NULL)
	{
		//	make sure we are dealing with the right kind of CF object
		if(CFGetTypeID(theValue) == CFNumberGetTypeID())
		{
			//	get the return value from the CF object
			CFNumberGetValue(static_cast<CFNumberRef>(theValue), kCFNumberFloat32Type, &outValue);
		}
		
		//	release the value since we aren't returning it
		CFRelease(theValue);
	}
}

void	CASettingsStorage::CopyFloat64Value(CFStringRef inKey, Float64& outValue, Float64 inDefaultValue) const
{
	//	initialize the return value
	outValue = inDefaultValue;
	
	//	get the raw value
	CFTypeRef theValue = NULL;
	CopyCFTypeValue(inKey, theValue, NULL);
	
	//	for this type, NULL is an invalid value
	if(theValue != NULL)
	{
		//	make sure we are dealing with the right kind of CF object
		if(CFGetTypeID(theValue) == CFNumberGetTypeID())
		{
			//	get the return value from the CF object
			CFNumberGetValue(static_cast<CFNumberRef>(theValue), kCFNumberFloat64Type, &outValue);
		}
		
		//	release the value since we aren't returning it
		CFRelease(theValue);
	}
}

void	CASettingsStorage::CopyNumberValue(CFStringRef inKey, CFNumberRef& outValue, CFNumberRef inDefaultValue) const
{
	//	initialize the return value
	outValue = NULL;

	//	get the raw value
	CFTypeRef theValue = NULL;
	CopyCFTypeValue(inKey, theValue, inDefaultValue);
	
	//	for this type, NULL is a valid value, but requires less work
	if(theValue != NULL)
	{
		//	make sure we are dealing with the right kind of CF object
		if(CFGetTypeID(theValue) == CFNumberGetTypeID())
		{
			//	set the return value to the CF object we are returning
			outValue = static_cast<CFNumberRef>(theValue);
		}
		else
		{
			//	release the value since we aren't returning it
			CFRelease(theValue);
			
			//	set the return value to the default value
			outValue = inDefaultValue;
			
			//	and retain it
			CFRetain(outValue);
		}
	}
}
	
void	CASettingsStorage::CopyStringValue(CFStringRef inKey, CFStringRef& outValue, CFStringRef inDefaultValue) const
{
	//	initialize the return value
	outValue = NULL;

	//	get the raw value
	CFTypeRef theValue = NULL;
	CopyCFTypeValue(inKey, theValue, inDefaultValue);
	
	//	for this type, NULL is a valid value, but requires less work
	if(theValue != NULL)
	{
		//	make sure we are dealing with the right kind of CF object
		if(CFGetTypeID(theValue) == CFStringGetTypeID())
		{
			//	set the return value to the CF object we are returning
			outValue = static_cast<CFStringRef>(theValue);
		}
		else
		{
			//	release the value since we aren't returning it
			CFRelease(theValue);
			
			//	set the return value to the default value
			outValue = inDefaultValue;
			
			//	and retain it
			CFRetain(outValue);
		}
	}
}
	
void	CASettingsStorage::CopyArrayValue(CFStringRef inKey, CFArrayRef& outValue, CFArrayRef inDefaultValue) const
{
	//	initialize the return value
	outValue = NULL;

	//	get the raw value
	CFTypeRef theValue = NULL;
	CopyCFTypeValue(inKey, theValue, inDefaultValue);
	
	//	for this type, NULL is a valid value, but requires less work
	if(theValue != NULL)
	{
		//	make sure we are dealing with the right kind of CF object
		if(CFGetTypeID(theValue) == CFArrayGetTypeID())
		{
			//	set the return value to the CF object we are returning
			outValue = static_cast<CFArrayRef>(theValue);
		}
		else
		{
			//	release the value since we aren't returning it
			CFRelease(theValue);
			
			//	set the return value to the default value
			outValue = inDefaultValue;
			
			//	and retain it
			CFRetain(outValue);
		}
	}
}
	
void	CASettingsStorage::CopyDictionaryValue(CFStringRef inKey, CFDictionaryRef& outValue, CFDictionaryRef inDefaultValue) const
{
	//	initialize the return value
	outValue = NULL;

	//	get the raw value
	CFTypeRef theValue = NULL;
	CopyCFTypeValue(inKey, theValue, inDefaultValue);
	
	//	for this type, NULL is a valid value, but requires less work
	if(theValue != NULL)
	{
		//	make sure we are dealing with the right kind of CF object
		if(CFGetTypeID(theValue) == CFDictionaryGetTypeID())
		{
			//	set the return value to the CF object we are returning
			outValue = static_cast<CFDictionaryRef>(theValue);
		}
		else
		{
			//	release the value since we aren't returning it
			CFRelease(theValue);
			
			//	set the return value to the default value
			outValue = inDefaultValue;
			
			//	and retain it
			CFRetain(outValue);
		}
	}
}
	
void	CASettingsStorage::CopyDataValue(CFStringRef inKey, CFDataRef& outValue, CFDataRef inDefaultValue) const
{
	//	initialize the return value
	outValue = NULL;

	//	get the raw value
	CFTypeRef theValue = NULL;
	CopyCFTypeValue(inKey, theValue, inDefaultValue);
	
	//	for this type, NULL is a valid value, but requires less work
	if(theValue != NULL)
	{
		//	make sure we are dealing with the right kind of CF object
		if(CFGetTypeID(theValue) == CFDataGetTypeID())
		{
			//	set the return value to the CF object we are returning
			outValue = static_cast<CFDataRef>(theValue);
		}
		else
		{
			//	release the value since we aren't returning it
			CFRelease(theValue);
			
			//	set the return value to the default value
			outValue = inDefaultValue;
			
			//	and retain it
			CFRetain(outValue);
		}
	}
}

void	CASettingsStorage::CopyCFTypeValue(CFStringRef inKey, CFTypeRef& outValue, CFTypeRef inDefaultValue) const
{
	//	make sure our cache is up to date
	const_cast<CASettingsStorage*>(this)->RefreshSettings();

	//	check to see if we have a value for the given key
	if(!CFDictionaryGetValueIfPresent(mSettingsCache, inKey, &outValue))
	{
		//	the key wasn't in the cache, so return the default value
		outValue = inDefaultValue;
	}
		
	//	make sure we retain the return value
	if(outValue != NULL)
	{
		CFRetain(outValue);
	}
}

void	CASettingsStorage::SetSInt32Value(CFStringRef inKey, SInt32 inValue)
{
	CACFNumber theValue(inValue);
	SetCFTypeValue(inKey, theValue.GetCFNumber());
}

void	CASettingsStorage::SetUInt32Value(CFStringRef inKey, UInt32 inValue)
{
	CACFNumber theValue(inValue);
	SetCFTypeValue(inKey, theValue.GetCFNumber());
}

void	CASettingsStorage::SetSInt64Value(CFStringRef inKey, SInt64 inValue)
{
	CACFNumber theValue(inValue);
	SetCFTypeValue(inKey, theValue.GetCFNumber());
}

void	CASettingsStorage::SetUInt64Value(CFStringRef inKey, UInt64 inValue)
{
	CACFNumber theValue(inValue);
	SetCFTypeValue(inKey, theValue.GetCFNumber());
}

void	CASettingsStorage::SetFloat32Value(CFStringRef inKey, Float32 inValue)
{
	CACFNumber theValue(inValue);
	SetCFTypeValue(inKey, theValue.GetCFNumber());
}

void	CASettingsStorage::SetFloat64Value(CFStringRef inKey, Float64 inValue)
{
	CACFNumber theValue(inValue);
	SetCFTypeValue(inKey, theValue.GetCFNumber());
}

void	CASettingsStorage::SetNumberValue(CFStringRef inKey, CFNumberRef inValue)
{
	SetCFTypeValue(inKey, inValue);
}

void	CASettingsStorage::SetStringValue(CFStringRef inKey, CFStringRef inValue)
{
	SetCFTypeValue(inKey, inValue);
}

void	CASettingsStorage::SetArrayValue(CFStringRef inKey, CFArrayRef inValue)
{
	SetCFTypeValue(inKey, inValue);
}

void	CASettingsStorage::SetDictionaryValue(CFStringRef inKey, CFDictionaryRef inValue)
{
	SetCFTypeValue(inKey, inValue);
}

void	CASettingsStorage::SetDataValue(CFStringRef inKey, CFDataRef inValue)
{
	SetCFTypeValue(inKey, inValue);
}

void	CASettingsStorage::SetCFTypeValue(CFStringRef inKey, CFTypeRef inValue)
{
	//	make sure our cache is up to date
	RefreshSettings();
	
	//	add the new key/value to the dictionary
	CFDictionarySetValue(mSettingsCache, inKey, inValue);
	
	//	write the settings to the file
	SaveSettings();
}

void	CASettingsStorage::RemoveValue(CFStringRef inKey)
{
	//	make sure our cache is up to date
	RefreshSettings();
	
	//	remove the given key
	CFDictionaryRemoveValue(mSettingsCache, inKey);
	
	//	write the settings to the file
	SaveSettings();
}

void	CASettingsStorage::RemoveAllValues()
{
	//	make sure our cache is up to date
	RefreshSettings();
	
	//	remove the given key
	CFDictionaryRemoveAllValues(mSettingsCache);
	
	//	write the settings to the file
	SaveSettings();
}

void	CASettingsStorage::SendNotification(CFStringRef inName, CFDictionaryRef inData, bool inPostToAllSessions) const
{
	CACFDistributedNotification::PostNotification(inName, inData, inPostToAllSessions);
}

void	CASettingsStorage::ForceRefresh()
{
	mSettingsCacheForceRefresh = true;
}

inline bool	operator<(const struct timespec& inX, const struct timespec& inY)
{
	return ((inX.tv_sec < inY.tv_sec) || ((inX.tv_sec == inY.tv_sec) && (inX.tv_nsec < inY.tv_nsec)));
}

void	CASettingsStorage::RefreshSettings()
{
	//	if this storage is only supporting a single process, there is no need to hit the disk unless
	//	required to by it being the first time or if the refresh is specifically forced for some reason
	if(!mIsSingleProcessOnly || (mSettingsCache == NULL) || ((mSettingsCacheTime.tv_sec == 0) && (mSettingsCacheTime.tv_nsec == 0)) || mSettingsCacheForceRefresh)
	{
		//	first, we need to stat the file to check the mod date, this has the side effect of also
		//	telling us if the file exisits
		struct stat theFileInfo;
		int theStatError = stat(mSettingsFilePath, &theFileInfo);
		
		//	we use this boolean to make error recovery easier since we need a case for when there's no file anyway
		bool theSettingsWereCached = false;
		bool theSettingsNeedSaving = true;
		
		if(theStatError == 0)
		{
			//	stat says there is something there, only have to do work if we either don't have a cache or the cache is out of date
			if((mSettingsCache == NULL) || (mSettingsCacheTime < theFileInfo.st_mtimespec) || mSettingsCacheForceRefresh)
			{
				//	open the file
				FILE* theFile = fopen(mSettingsFilePath, "r");
				if(theFile != NULL)
				{
					//	lock the file (this call blocks until the lock is taken)
					int theError = flock(fileno(theFile), LOCK_EX);
					if(theError == 0)
					{
						//	get the length of the file
						fseek(theFile, 0, SEEK_END);
						size_t theFileLength = static_cast<size_t>(ftell(theFile));
						fseek(theFile, 0, SEEK_SET);
						
						if(theFileLength > 0)
						{
							//	allocate a block of memory to hold the data in the file
							CAAutoFree<Byte> theRawFileData(theFileLength);
							
							//	read all the data in
							fread(static_cast<Byte*>(theRawFileData), theFileLength, 1, theFile);
							
							//	release the lock
							flock(fileno(theFile), LOCK_UN);
							
							//	put it into a CFData object
							CACFData theRawFileDataCFData(static_cast<Byte*>(theRawFileData), static_cast<UInt32>(theFileLength));
							
							//	get rid of the existing cache
							if(mSettingsCache != NULL)
							{
								CFRelease(mSettingsCache);
								mSettingsCache = NULL;
							}
							
							//	parse the data as a property list
							mSettingsCache = (CFMutableDictionaryRef)CFPropertyListCreateWithData(NULL, theRawFileDataCFData.GetCFData(), kCFPropertyListMutableContainersAndLeaves, NULL, NULL);
							
							//	check to be sure we parsed a plist out of the file
							if(mSettingsCache != NULL)
							{
								//	save the date of the cache
								mSettingsCacheTime = theFileInfo.st_mtimespec;
								
								//	mark that we're done
								theSettingsWereCached = true;
								theSettingsNeedSaving = false;
							}
						}
					}
					
					//	close the file
					fclose(theFile);
					mSettingsCacheForceRefresh = false;
				}
			}
			else
			{
				//	nothing to do since the file was older than the cached data
				theSettingsNeedSaving = false;
				theSettingsWereCached = true;
			}
		}
		
		//	if there was a failure, we need to clean up 
		if((theStatError != 0) || theSettingsNeedSaving || !theSettingsWereCached)
		{
			//	we get here if either there isn't a file or something wacky happenned while parsing it
			//	so, make sure we have a valid cache dictionary
			if(mSettingsCache == NULL)
			{
				mSettingsCache = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
			}
			
			mSettingsCacheTime.tv_sec = 0;
			mSettingsCacheTime.tv_nsec = 0;
			
			if((theStatError != 0) || theSettingsNeedSaving)
			{
				SaveSettings();
			}
		}
	}
}

void	CASettingsStorage::SaveSettings()
{
	if(!mIsReadOnly && (mSettingsCache != NULL))
	{
		//	make a CFData that contains the new settings
		CACFData theNewRawPrefsCFData(CFPropertyListCreateData(NULL, mSettingsCache, mSettingsCacheFormat, 0, NULL), true);
		
		//	open the file for writing
		FILE* theFile = fopen(mSettingsFilePath, "w+");
		if(theFile != NULL)
		{
			//	lock the file (this call blocks until the lock is taken)
			int theError = flock(fileno(theFile), LOCK_EX);
			if(theError == 0)
			{
				//	set the file access mode if necessary
				if(mSettingsFileAccessMode != 0)
				{
					fchmod(fileno(theFile), mSettingsFileAccessMode);
				}
				
				//	write the data
				fwrite(theNewRawPrefsCFData.GetDataPtr(), theNewRawPrefsCFData.GetSize(), 1, theFile);
				
				//	flush the file to be sure it is all on disk
				fflush(theFile);
				
				//	release the lock
				flock(fileno(theFile), LOCK_UN);
			
				//	close the file
				fclose(theFile);
				
				//	stat the file to get the mod date
				struct stat theFileInfo;
				stat(mSettingsFilePath, &theFileInfo);
				
				//	save the mod date
				mSettingsCacheTime = theFileInfo.st_mtimespec;
			}
			else
			{
				//	close the file
				fclose(theFile);
			}
		}
	}
}