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// --------------------------------------------------------------------------
//
// File
// Name: RaidFileController.cpp
// Purpose: Controls config and daemon comms for RaidFile classes
// Created: 2003/07/08
//
// --------------------------------------------------------------------------
#include "Box.h"
#include <stdio.h>
#include "RaidFileController.h"
#include "RaidFileException.h"
#include "Configuration.h"
#include "MemLeakFindOn.h"
RaidFileController RaidFileController::mController;
// --------------------------------------------------------------------------
//
// Function
// Name: RaidFileController::RaidFileController()
// Purpose: Constructor
// Created: 2003/07/08
//
// --------------------------------------------------------------------------
RaidFileController::RaidFileController()
{
}
// --------------------------------------------------------------------------
//
// Function
// Name: RaidFileController::~RaidFileController()
// Purpose: Destructor
// Created: 2003/07/08
//
// --------------------------------------------------------------------------
RaidFileController::~RaidFileController()
{
}
// --------------------------------------------------------------------------
//
// Function
// Name: RaidFileController::RaidFileController()
// Purpose: Copy constructor
// Created: 2003/07/08
//
// --------------------------------------------------------------------------
RaidFileController::RaidFileController(const RaidFileController &rController)
{
THROW_EXCEPTION(RaidFileException, Internal)
}
// --------------------------------------------------------------------------
//
// Function
// Name: RaidFileController::Initialise(const char *)
// Purpose: Initialises the system, loading the configuration file.
// Created: 2003/07/08
//
// --------------------------------------------------------------------------
void RaidFileController::Initialise(const char *ConfigFilename)
{
static const ConfigurationVerifyKey verifykeys[] =
{
{"SetNumber", 0, ConfigTest_Exists | ConfigTest_IsInt, 0},
{"BlockSize", 0, ConfigTest_Exists | ConfigTest_IsInt, 0},
{"Dir0", 0, ConfigTest_Exists, 0},
{"Dir1", 0, ConfigTest_Exists, 0},
{"Dir2", 0, ConfigTest_Exists | ConfigTest_LastEntry, 0}
};
static const ConfigurationVerify subverify =
{
"*",
0,
verifykeys,
ConfigTest_LastEntry,
0
};
static const ConfigurationVerify verify =
{
"RAID FILE CONFIG",
&subverify,
0,
ConfigTest_LastEntry,
0
};
// Load the configuration
std::string err;
std::auto_ptr<Configuration> pconfig = Configuration::LoadAndVerify(ConfigFilename, &verify, err);
if(pconfig.get() == 0 || !err.empty())
{
fprintf(stderr, "RaidFile configuation file errors:\n%s", err.c_str());
THROW_EXCEPTION(RaidFileException, BadConfigFile)
}
// Use the values
int expectedSetNum = 0;
std::vector<std::string> confdiscs(pconfig->GetSubConfigurationNames());
for(std::vector<std::string>::const_iterator i(confdiscs.begin()); i != confdiscs.end(); ++i)
{
const Configuration &disc(pconfig->GetSubConfiguration((*i).c_str()));
int setNum = disc.GetKeyValueInt("SetNumber");
if(setNum != expectedSetNum)
{
THROW_EXCEPTION(RaidFileException, BadConfigFile)
}
RaidFileDiscSet set(setNum, (unsigned int)disc.GetKeyValueInt("BlockSize"));
// Get the values of the directory keys
std::string d0(disc.GetKeyValue("Dir0"));
std::string d1(disc.GetKeyValue("Dir1"));
std::string d2(disc.GetKeyValue("Dir2"));
// Are they all different (using RAID) or all the same (not using RAID)
if(d0 != d1 && d1 != d2 && d0 != d2)
{
set.push_back(d0);
set.push_back(d1);
set.push_back(d2);
}
else if(d0 == d1 && d0 == d2)
{
// Just push the first one, which is the non-RAID place to store files
set.push_back(d0);
}
else
{
// One must be the same as another! Which is bad.
THROW_EXCEPTION(RaidFileException, BadConfigFile)
}
mSetList.push_back(set);
expectedSetNum++;
}
}
// --------------------------------------------------------------------------
//
// Function
// Name: RaidFileController::GetDiscSet(int)
// Purpose: Returns the numbered disc set
// Created: 2003/07/08
//
// --------------------------------------------------------------------------
RaidFileDiscSet &RaidFileController::GetDiscSet(unsigned int DiscSetNum)
{
if(DiscSetNum < 0 || DiscSetNum >= mSetList.size())
{
THROW_EXCEPTION(RaidFileException, NoSuchDiscSet)
}
return mSetList[DiscSetNum];
}
// --------------------------------------------------------------------------
//
// Function
// Name: RaidFileDiscSet::GetSetNumForWriteFiles(const std::string &)
// Purpose: Returns the set number the 'temporary' written files should
// be stored on, given a filename.
// Created: 2003/07/10
//
// --------------------------------------------------------------------------
int RaidFileDiscSet::GetSetNumForWriteFiles(const std::string &rFilename) const
{
// Simple hash function, add up the ASCII values of all the characters,
// and get modulo number of partitions in the set.
std::string::const_iterator i(rFilename.begin());
int h = 0;
for(; i != rFilename.end(); ++i)
{
h += (*i);
}
return h % size();
}
// --------------------------------------------------------------------------
//
// Function
// Name: RaidFileController::DiscSetPathToFileSystemPath(unsigned int, const std::string &, int)
// Purpose: Given a Raid File style file name, return a filename for the physical filing system.
// DiscOffset is effectively the disc number (but remember files are rotated around the
// discs in a disc set)
// Created: 19/1/04
//
// --------------------------------------------------------------------------
std::string RaidFileController::DiscSetPathToFileSystemPath(unsigned int DiscSetNum, const std::string &rFilename, int DiscOffset)
{
if(DiscSetNum < 0 || DiscSetNum >= mController.mSetList.size())
{
THROW_EXCEPTION(RaidFileException, NoSuchDiscSet)
}
// Work out which disc it's to be on
int disc = (mController.mSetList[DiscSetNum].GetSetNumForWriteFiles(rFilename) + DiscOffset)
% mController.mSetList[DiscSetNum].size();
// Make the string
std::string r((mController.mSetList[DiscSetNum])[disc]);
r += DIRECTORY_SEPARATOR_ASCHAR;
r += rFilename;
return r;
}
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