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cuberite-2a
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RankMgr: Fixed multithreading issues. 

Only one thread is allowed to interact with a SQLite::Database object at a time.
Additionally, improved performance of the migration by wrapping the entire thing in a transaction.
This commit is contained in:
madmaxoft 2014-08-13 12:33:31 +02:00
parent e110f72268
commit 5e415c5b95
2 changed files with 110 additions and 50 deletions
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128
src/RankManager.cpp
View File

@ -5,7 +5,6 @@
#include "Globals.h"
#include "RankManager.h"
#include "SQLiteCpp/Transaction.h"
#include "inifile/iniFile.h"
#include "Protocol/MojangAPI.h"
@ -237,6 +236,8 @@ public:
/** Performs the complete migration from INI files to DB. */
bool Migrate(void)
{
cRankManager::cMassChangeLock Lock(m_RankManager);
LOGD("Reading groups...");
if (!ReadGroups())
{
@ -615,6 +616,7 @@ void cRankManager::Initialize(cMojangAPI & a_MojangAPI)
AString cRankManager::GetPlayerRankName(const AString & a_PlayerUUID)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
@ -642,6 +644,7 @@ AString cRankManager::GetPlayerRankName(const AString & a_PlayerUUID)
AStringVector cRankManager::GetPlayerGroups(const AString & a_PlayerUUID)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
AStringVector res;
try
@ -677,6 +680,7 @@ AStringVector cRankManager::GetPlayerGroups(const AString & a_PlayerUUID)
AStringVector cRankManager::GetPlayerPermissions(const AString & a_PlayerUUID)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
AStringVector res;
try
@ -712,6 +716,7 @@ AStringVector cRankManager::GetPlayerPermissions(const AString & a_PlayerUUID)
AStringVector cRankManager::GetRankGroups(const AString & a_RankName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
AStringVector res;
try
@ -742,6 +747,7 @@ AStringVector cRankManager::GetRankGroups(const AString & a_RankName)
AStringVector cRankManager::GetGroupPermissions(const AString & a_GroupName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
AStringVector res;
try
@ -771,6 +777,7 @@ AStringVector cRankManager::GetGroupPermissions(const AString & a_GroupName)
AStringVector cRankManager::GetRankPermissions(const AString & a_RankName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
AStringVector res;
try
@ -801,6 +808,7 @@ AStringVector cRankManager::GetRankPermissions(const AString & a_RankName)
AStringVector cRankManager::GetAllRanks(void)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
AStringVector res;
try
@ -825,6 +833,7 @@ AStringVector cRankManager::GetAllRanks(void)
AStringVector cRankManager::GetAllGroups(void)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
AStringVector res;
try
@ -849,6 +858,7 @@ AStringVector cRankManager::GetAllGroups(void)
AStringVector cRankManager::GetAllPermissions(void)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
AStringVector res;
try
@ -878,6 +888,7 @@ bool cRankManager::GetPlayerMsgVisuals(
)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
AStringVector res;
try
@ -923,6 +934,7 @@ void cRankManager::AddRank(
)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
@ -965,10 +977,11 @@ void cRankManager::AddRank(
void cRankManager::AddGroup(const AString & a_GroupName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
// Check if such a rank name is already used:
// Check if such a group name is already used:
{
SQLite::Statement stmt(m_DB, "SELECT COUNT(*) FROM PermGroup WHERE Name = ?");
stmt.bind(1, a_GroupName);
@ -982,7 +995,7 @@ void cRankManager::AddGroup(const AString & a_GroupName)
}
}
// Insert a new rank:
// Insert a new group:
SQLite::Statement stmt(m_DB, "INSERT INTO PermGroup (Name) VALUES (?)");
stmt.bind(1, a_GroupName);
if (stmt.exec() <= 0)
@ -1001,16 +1014,58 @@ void cRankManager::AddGroup(const AString & a_GroupName)
bool cRankManager::AddGroupToRank(const AString & a_GroupName, const AString & a_RankName)
void cRankManager::AddGroups(const AStringVector & a_GroupNames)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
for (AStringVector::const_iterator itr = a_GroupNames.begin(), end = a_GroupNames.end(); itr != end; ++itr)
{
// Check if such the group name is already used:
{
SQLite::Statement stmt(m_DB, "SELECT COUNT(*) FROM PermGroup WHERE Name = ?");
stmt.bind(1, *itr);
if (stmt.executeStep())
{
if (stmt.getColumn(0).getInt() > 0)
{
// Group already exists, do nothing:
return;
}
}
}
// Insert a new group:
SQLite::Statement stmt(m_DB, "INSERT INTO PermGroup (Name) VALUES (?)");
stmt.bind(1, *itr);
if (stmt.exec() <= 0)
{
LOGWARNING("%s: Failed to add a new group \"%s\".", __FUNCTION__, itr->c_str());
return;
}
} // for itr - a_GroupNames[]
}
catch (const SQLite::Exception & ex)
{
LOGWARNING("%s: Failed to add new groups: %s", __FUNCTION__, ex.what());
}
}
bool cRankManager::AddGroupToRank(const AString & a_GroupName, const AString & a_RankName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
SQLite::Transaction trans(m_DB);
int GroupID, RankID;
// Get the group's ID:
int GroupID;
{
SQLite::Statement stmt(m_DB, "SELECT PermGroupID FROM PermGroup WHERE Name = ?");
stmt.bind(1, a_GroupName);
@ -1023,6 +1078,7 @@ bool cRankManager::AddGroupToRank(const AString & a_GroupName, const AString & a
}
// Get the rank's ID:
int RankID;
{
SQLite::Statement stmt(m_DB, "SELECT RankID FROM Rank WHERE Name = ?");
stmt.bind(1, a_RankName);
@ -1066,7 +1122,6 @@ bool cRankManager::AddGroupToRank(const AString & a_GroupName, const AString & a
}
// Adding succeeded:
trans.commit();
return true;
}
catch (const SQLite::Exception & ex)
@ -1083,12 +1138,10 @@ bool cRankManager::AddGroupToRank(const AString & a_GroupName, const AString & a
bool cRankManager::AddPermissionToGroup(const AString & a_Permission, const AString & a_GroupName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
// Wrapp the entire operation into a transaction:
SQLite::Transaction trans(m_DB);
// Get the group's ID:
int GroupID;
{
@ -1134,7 +1187,6 @@ bool cRankManager::AddPermissionToGroup(const AString & a_Permission, const AStr
}
// Adding succeeded:
trans.commit();
return true;
}
catch (const SQLite::Exception & ex)
@ -1153,12 +1205,10 @@ bool cRankManager::AddPermissionToGroup(const AString & a_Permission, const AStr
bool cRankManager::AddPermissionsToGroup(const AStringVector & a_Permissions, const AString & a_GroupName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
// Wrapp the entire operation into a transaction:
SQLite::Transaction trans(m_DB);
// Get the group's ID:
int GroupID;
{
@ -1207,7 +1257,6 @@ bool cRankManager::AddPermissionsToGroup(const AStringVector & a_Permissions, co
} // for itr - a_Permissions[]
// Adding succeeded:
trans.commit();
return true;
}
catch (const SQLite::Exception & ex)
@ -1226,13 +1275,11 @@ bool cRankManager::AddPermissionsToGroup(const AStringVector & a_Permissions, co
void cRankManager::RemoveRank(const AString & a_RankName, const AString & a_ReplacementRankName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
AStringVector res;
try
{
// Wrap everything into a transaction:
SQLite::Transaction trans(m_DB);
// Get the RankID for the rank being removed:
int RemoveRankID;
{
@ -1287,8 +1334,6 @@ void cRankManager::RemoveRank(const AString & a_RankName, const AString & a_Repl
stmt.bind(1, RemoveRankID);
stmt.exec();
}
trans.commit();
}
catch (const SQLite::Exception & ex)
{
@ -1303,12 +1348,10 @@ void cRankManager::RemoveRank(const AString & a_RankName, const AString & a_Repl
void cRankManager::RemoveGroup(const AString & a_GroupName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
// Wrap everything into a transaction:
SQLite::Transaction trans(m_DB);
// Get the ID of the group:
int GroupID;
{
@ -1342,8 +1385,6 @@ void cRankManager::RemoveGroup(const AString & a_GroupName)
stmt.bind(1, GroupID);
stmt.exec();
}
trans.commit();
}
catch (const SQLite::Exception & ex)
{
@ -1358,12 +1399,10 @@ void cRankManager::RemoveGroup(const AString & a_GroupName)
void cRankManager::RemoveGroupFromRank(const AString & a_GroupName, const AString & a_RankName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
// Wrap everything into a transaction:
SQLite::Transaction trans(m_DB);
// Get the IDs of the group and the rank:
int GroupID, RankID;
{
@ -1398,8 +1437,6 @@ void cRankManager::RemoveGroupFromRank(const AString & a_GroupName, const AStrin
stmt.bind(1, RankID);
stmt.exec();
}
trans.commit();
}
catch (const SQLite::Exception & ex)
{
@ -1414,12 +1451,10 @@ void cRankManager::RemoveGroupFromRank(const AString & a_GroupName, const AStrin
void cRankManager::RemovePermissionFromGroup(const AString & a_Permission, const AString & a_GroupName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
// Wrap everything into a transaction:
SQLite::Transaction trans(m_DB);
// Get the ID of the group:
int GroupID;
{
@ -1440,8 +1475,6 @@ void cRankManager::RemovePermissionFromGroup(const AString & a_Permission, const
stmt.bind(2, a_Permission);
stmt.exec();
}
trans.commit();
}
catch (const SQLite::Exception & ex)
{
@ -1458,12 +1491,10 @@ void cRankManager::RemovePermissionFromGroup(const AString & a_Permission, const
bool cRankManager::RenameRank(const AString & a_OldName, const AString & a_NewName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
// Wrap everything into a transaction:
SQLite::Transaction trans(m_DB);
// Check that NewName doesn't exist:
{
SQLite::Statement stmt(m_DB, "SELECT RankID FROM Rank WHERE Name = ?");
@ -1484,7 +1515,6 @@ bool cRankManager::RenameRank(const AString & a_OldName, const AString & a_NewNa
res = (stmt.exec() > 0);
}
trans.commit();
return res;
}
catch (const SQLite::Exception & ex)
@ -1502,12 +1532,10 @@ bool cRankManager::RenameRank(const AString & a_OldName, const AString & a_NewNa
bool cRankManager::RenameGroup(const AString & a_OldName, const AString & a_NewName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
// Wrap everything into a transaction:
SQLite::Transaction trans(m_DB);
// Check that NewName doesn't exist:
{
SQLite::Statement stmt(m_DB, "SELECT PermGroupID FROM PermGroup WHERE Name = ?");
@ -1528,7 +1556,6 @@ bool cRankManager::RenameGroup(const AString & a_OldName, const AString & a_NewN
res = (stmt.exec() > 0);
}
trans.commit();
return res;
}
catch (const SQLite::Exception & ex)
@ -1546,12 +1573,10 @@ bool cRankManager::RenameGroup(const AString & a_OldName, const AString & a_NewN
void cRankManager::SetPlayerRank(const AString & a_PlayerUUID, const AString & a_PlayerName, const AString & a_RankName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
// Wrap the entire operation into a transaction:
SQLite::Transaction trans(m_DB);
// Get the rank ID:
int RankID;
{
@ -1574,7 +1599,6 @@ void cRankManager::SetPlayerRank(const AString & a_PlayerUUID, const AString & a
if (stmt.exec() > 0)
{
// Successfully updated the player's rank
trans.commit();
return;
}
}
@ -1587,7 +1611,6 @@ void cRankManager::SetPlayerRank(const AString & a_PlayerUUID, const AString & a
if (stmt.exec() > 0)
{
// Successfully added the player
trans.commit();
return;
}
@ -1615,6 +1638,7 @@ void cRankManager::SetRankVisuals(
)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
@ -1646,6 +1670,7 @@ bool cRankManager::GetRankVisuals(
)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
@ -1675,6 +1700,7 @@ bool cRankManager::GetRankVisuals(
bool cRankManager::RankExists(const AString & a_RankName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
@ -1700,6 +1726,7 @@ bool cRankManager::RankExists(const AString & a_RankName)
bool cRankManager::GroupExists(const AString & a_GroupName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
@ -1725,6 +1752,7 @@ bool cRankManager::GroupExists(const AString & a_GroupName)
bool cRankManager::IsPlayerRankSet(const AString & a_PlayerUUID)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
@ -1750,6 +1778,7 @@ bool cRankManager::IsPlayerRankSet(const AString & a_PlayerUUID)
bool cRankManager::IsGroupInRank(const AString & a_GroupName, const AString & a_RankName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{
@ -1781,6 +1810,7 @@ bool cRankManager::IsGroupInRank(const AString & a_GroupName, const AString & a_
bool cRankManager::IsPermissionInGroup(const AString & a_Permission, const AString & a_GroupName)
{
ASSERT(m_IsInitialized);
cCSLock Lock(m_CS);
try
{

32
src/RankManager.h
View File

@ -9,6 +9,7 @@
#pragma once
#include "SQLiteCpp/Database.h"
#include "SQLiteCpp/Transaction.h"
@ -23,6 +24,29 @@ class cMojangAPI;
class cRankManager
{
public:
/** Acquire this lock to perform mass changes.
Improves performance by wrapping everything into a transaction.
Makes sure that no other thread is accessing the DB. */
class cMassChangeLock
{
public:
cMassChangeLock(cRankManager & a_RankManager) :
m_Lock(a_RankManager.m_CS),
m_Transaction(a_RankManager.m_DB)
{
}
~cMassChangeLock()
{
m_Transaction.commit();
}
protected:
cCSLock m_Lock;
SQLite::Transaction m_Transaction;
};
/** Creates the rank manager. Needs to be initialized before other use. */
cRankManager(void);
@ -80,6 +104,9 @@ public:
/** Adds a new permission group. No action if such a group already exists. */
void AddGroup(const AString & a_GroupName);
/** Bulk-adds groups. Group names that already exist are silently skipped. */
void AddGroups(const AStringVector & a_GroupNames);
/** Adds the specified permission group to the specified rank.
Fails if the rank or group names are not found.
Returns true if successful, false on error. */
@ -163,9 +190,12 @@ public:
protected:
/** The database storage for all the data. */
/** The database storage for all the data. Protected by m_CS. */
SQLite::Database m_DB;
/** The mutex protecting m_DB against multi-threaded access. */
cCriticalSection m_CS;
/** Set to true once the manager is initialized. */
bool m_IsInitialized;