/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2009 InspIRCd Development Team
* See: http://wiki.inspircd.org/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
/* Stop mysql wanting to use long long */
#define NO_CLIENT_LONG_LONG
#include "inspircd.h"
#include <mysql.h>
#include "m_sqlv2.h"
#ifdef WINDOWS
#pragma comment(lib, "mysqlclient.lib")
#endif
/* VERSION 2 API: With nonblocking (threaded) requests */
/* $ModDesc: SQL Service Provider module for all other m_sql* modules */
/* $CompileFlags: exec("mysql_config --include") */
/* $LinkerFlags: exec("mysql_config --libs_r") rpath("mysql_config --libs_r") */
/* $ModDep: m_sqlv2.h */
/* THE NONBLOCKING MYSQL API!
*
* MySQL provides no nonblocking (asyncronous) API of its own, and its developers recommend
* that instead, you should thread your program. This is what i've done here to allow for
* asyncronous SQL requests via mysql. The way this works is as follows:
*
* The module spawns a thread via class Thread, and performs its mysql queries in this thread,
* using a queue with priorities. There is a mutex on either end which prevents two threads
* adjusting the queue at the same time, and crashing the ircd. Every 50 milliseconds, the
* worker thread wakes up, and checks if there is a request at the head of its queue.
* If there is, it processes this request, blocking the worker thread but leaving the ircd
* thread to go about its business as usual. During this period, the ircd thread is able
* to insert futher pending requests into the queue.
*
* Once the processing of a request is complete, it is removed from the incoming queue to
* an outgoing queue, and initialized as a 'response'. The worker thread then signals the
* ircd thread (via a loopback socket) of the fact a result is available, by sending the
* connection ID through the connection.
*
* The ircd thread then mutexes the queue once more, reads the outbound response off the head
* of the queue, and sends it on its way to the original calling module.
*
* XXX: You might be asking "why doesnt he just send the response from within the worker thread?"
* The answer to this is simple. The majority of InspIRCd, and in fact most ircd's are not
* threadsafe. This module is designed to be threadsafe and is careful with its use of threads,
* however, if we were to call a module's OnRequest even from within a thread which was not the
* one the module was originally instantiated upon, there is a chance of all hell breaking loose
* if a module is ever put in a re-enterant state (stack corruption could occur, crashes, data
* corruption, and worse, so DONT think about it until the day comes when InspIRCd is 100%
* gauranteed threadsafe!)
*
* For a diagram of this system please see http://wiki.inspircd.org/Mysql2
*/
class SQLConnection;
class DispatcherThread;
typedef std::map<std::string, SQLConnection*> ConnMap;
typedef std::deque<SQLresult*> ResultQueue;
unsigned long count(const char * const str, char a)
{
unsigned long n = 0;
for (const char *p = reinterpret_cast<const char *>(str); *p; ++p)
{
if (*p == '?')
++n;
}
return n;
}
/** MySQL module
* */
class ModuleSQL : public Module
{
public:
ConfigReader *Conf;
InspIRCd* PublicServerInstance;
int currid;
bool rehashing;
DispatcherThread* Dispatcher;
Mutex ResultsMutex;
Mutex LoggingMutex;
Mutex ConnMutex;
ModuleSQL(InspIRCd* Me);
~ModuleSQL();
unsigned long NewID();
const char* OnRequest(Request* request);
void OnRehash(User* user);
Version GetVersion();
};
#if !defined(MYSQL_VERSION_ID) || MYSQL_VERSION_ID<32224
#define mysql_field_count mysql_num_fields
#endif
/** Represents a mysql result set
*/
class MySQLresult : public SQLresult
{
int currentrow;
std::vector<std::string> colnames;
std::vector<SQLfieldList> fieldlists;
SQLfieldMap* fieldmap;
SQLfieldMap fieldmap2;
SQLfieldList emptyfieldlist;
int rows;
public:
MySQLresult(Module* self, Module* to, MYSQL_RES* res, int affected_rows, unsigned int rid) : SQLresult(self, to, rid), currentrow(0), fieldmap(NULL)
{
/* A number of affected rows from from mysql_affected_rows.
*/
fieldlists.clear();
rows = 0;
if (affected_rows >= 1)
{
rows = affected_rows;
fieldlists.resize(rows);
}
unsigned int field_count = 0;
if (res)
{
MYSQL_ROW row;
int n = 0;
while ((row = mysql_fetch_row(res)))
{
if (fieldlists.size() < (unsigned int)rows+1)
{
fieldlists.resize(fieldlists.size()+1);
}
field_count = 0;
MYSQL_FIELD *fields = mysql_fetch_fields(res);
if(mysql_num_fields(res) == 0)
break;
if (fields && mysql_num_fields(res))
{
colnames.clear();
while (field_count < mysql_num_fields(res))
{
std::string a = (fields[field_count].name ? fields[field_count].name : "");
std::string b = (row[field_count] ? row[field_count] : "");
SQLfield sqlf(b, !row[field_count]);
colnames.push_back(a);
fieldlists[n].push_back(sqlf);
field_count++;
}
n++;
}
rows++;
}
mysql_free_result(res);
res = NULL;
}
}
MySQLresult(Module* self, Module* to, SQLerror e, unsigned int rid) : SQLresult(self, to, rid), currentrow(0)
{
rows = 0;
error = e;
}
~MySQLresult()
{
}
virtual int Rows()
{
return rows;
}
virtual int Cols()
{
return colnames.size();
}
virtual std::string ColName(int column)
{
if (column < (int)colnames.size())
{
return colnames[column];
}
else
{
throw SQLbadColName();
}
return "";
}
virtual int ColNum(const std::string &column)
{
for (unsigned int i = 0; i < colnames.size(); i++)
{
if (column == colnames[i])
return i;
}
throw SQLbadColName();
return 0;
}
virtual SQLfield GetValue(int row, int column)
{
if ((row >= 0) && (row < rows) && (column >= 0) && (column < Cols()))
{
return fieldlists[row][column];
}
throw SQLbadColName();
/* XXX: We never actually get here because of the throw */
return SQLfield("",true);
}
virtual SQLfieldList& GetRow()
{
if (currentrow < rows)
return fieldlists[currentrow++];
else
return emptyfieldlist;
}
virtual SQLfieldMap& GetRowMap()
{
fieldmap2.clear();
if (currentrow < rows)
{
for (int i = 0; i < Cols(); i++)
{
fieldmap2.insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
}
currentrow++;
}
return fieldmap2;
}
virtual SQLfieldList* GetRowPtr()
{
SQLfieldList* fieldlist = new SQLfieldList();
if (currentrow < rows)
{
for (int i = 0; i < Rows(); i++)
{
fieldlist->push_back(fieldlists[currentrow][i]);
}
currentrow++;
}
return fieldlist;
}
virtual SQLfieldMap* GetRowMapPtr()
{
fieldmap = new SQLfieldMap();
if (currentrow < rows)
{
for (int i = 0; i < Cols(); i++)
{
fieldmap->insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
}
currentrow++;
}
return fieldmap;
}
virtual void Free(SQLfieldMap* fm)
{
delete fm;
}
virtual void Free(SQLfieldList* fl)
{
delete fl;
}
};
/** Represents a connection to a mysql database
*/
class SQLConnection : public classbase
{
protected:
MYSQL *connection;
MYSQL_RES *res;
MYSQL_ROW *row;
SQLhost host;
std::map<std::string,std::string> thisrow;
bool Enabled;
ModuleSQL* Parent;
public:
QueryQueue queue;
ResultQueue rq;
// This constructor creates an SQLConnection object with the given credentials, but does not connect yet.
SQLConnection(const SQLhost &hi, ModuleSQL* Creator) : connection(NULL), host(hi), Enabled(false), Parent(Creator)
{
}
~SQLConnection()
{
Close();
}
// This method connects to the database using the credentials supplied to the constructor, and returns
// true upon success.
bool Connect()
{
unsigned int timeout = 1;
connection = mysql_init(connection);
mysql_options(connection,MYSQL_OPT_CONNECT_TIMEOUT,(char*)&timeout);
return mysql_real_connect(connection, host.host.c_str(), host.user.c_str(), host.pass.c_str(), host.name.c_str(), host.port, NULL, 0);
}
void DoLeadingQuery()
{
if (!CheckConnection())
return;
/* Parse the command string and dispatch it to mysql */
SQLrequest& req = queue.front();
/* Pointer to the buffer we screw around with substitution in */
char* query;
/* Pointer to the current end of query, where we append new stuff */
char* queryend;
/* Total length of the unescaped parameters */
unsigned long maxparamlen, paramcount;
/* The length of the longest parameter */
maxparamlen = 0;
for(ParamL::iterator i = req.query.p.begin(); i != req.query.p.end(); i++)
{
if (i->size() > maxparamlen)
maxparamlen = i->size();
}
/* How many params are there in the query? */
paramcount = count(req.query.q.c_str(), '?');
/* This stores copy of params to be inserted with using numbered params 1;3B*/
ParamL paramscopy(req.query.p);
/* To avoid a lot of allocations, allocate enough memory for the biggest the escaped query could possibly be.
* sizeofquery + (maxtotalparamlength*2) + 1
*
* The +1 is for null-terminating the string for mysql_real_escape_string
*/
query = new char[req.query.q.length() + (maxparamlen*paramcount*2) + 1];
queryend = query;
/* Okay, now we have a buffer large enough we need to start copying the query into it and escaping and substituting
* the parameters into it...
*/
for(unsigned long i = 0; i < req.query.q.length(); i++)
{
if(req.query.q[i] == '?')
{
/* We found a place to substitute..what fun.
* use mysql calls to escape and write the
* escaped string onto the end of our query buffer,
* then we "just" need to make sure queryend is
* pointing at the right place.
*/
/* Is it numbered parameter?
*/
bool numbered;
numbered = false;
/* Numbered parameter number :|
*/
unsigned int paramnum;
paramnum = 0;
/* Let's check if it's a numbered param. And also calculate it's number.
*/
while ((i < req.query.q.length() - 1) && (req.query.q[i+1] >= '0') && (req.query.q[i+1] <= '9'))
{
numbered = true;
++i;
paramnum = paramnum * 10 + req.query.q[i] - '0';
}
if (paramnum > paramscopy.size() - 1)
{
/* index is out of range!
*/
numbered = false;
}
if (numbered)
{
unsigned long len = mysql_real_escape_string(connection, queryend, paramscopy[paramnum].c_str(), paramscopy[paramnum].length());
queryend += len;
}
else if (req.query.p.size())
{
unsigned long len = mysql_real_escape_string(connection, queryend, req.query.p.front().c_str(), req.query.p.front().length());
queryend += len;
req.query.p.pop_front();
}
else
break;
}
else
{
*queryend = req.query.q[i];
queryend++;
}
}
*queryend = 0;
req.query.q = query;
if (!mysql_real_query(connection, req.query.q.data(), req.query.q.length()))
{
/* Successfull query */
res = mysql_use_result(connection);
unsigned long rows = mysql_affected_rows(connection);
MySQLresult* r = new MySQLresult(Parent, req.GetSource(), res, rows, req.id);
r->dbid = this->GetID();
r->query = req.query.q;
/* Put this new result onto the results queue.
* XXX: Remember to mutex the queue!
*/
Parent->ResultsMutex.Lock();
rq.push_back(r);
Parent->ResultsMutex.Unlock();
}
else
{
/* XXX: See /usr/include/mysql/mysqld_error.h for a list of
* possible error numbers and error messages */
SQLerror e(SQL_QREPLY_FAIL, ConvToStr(mysql_errno(connection)) + std::string(": ") + mysql_error(connection));
MySQLresult* r = new MySQLresult(Parent, req.GetSource(), e, req.id);
r->dbid = this->GetID();
r->query = req.query.q;
Parent->ResultsMutex.Lock();
rq.push_back(r);
Parent->ResultsMutex.Unlock();
}
delete[] query;
}
bool ConnectionLost()
{
if (&connection)
{
return (mysql_ping(connection) != 0);
}
else return false;
}
bool CheckConnection()
{
if (ConnectionLost())
{
return Connect();
}
else return true;
}
std::string GetError()
{
return mysql_error(connection);
}
const std::string& GetID()
{
return host.id;
}
std::string GetHost()
{
return host.host;
}
void SetEnable(bool Enable)
{
Enabled = Enable;
}
bool IsEnabled()
{
return Enabled;
}
void Close()
{
mysql_close(connection);
}
const SQLhost& GetConfHost()
{
return host;
}
};
ConnMap Connections;
bool HasHost(const SQLhost &host)
{
for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); iter++)
{
if (host == iter->second->GetConfHost())
return true;
}
return false;
}
bool HostInConf(ConfigReader* conf, const SQLhost &h)
{
for(int i = 0; i < conf->Enumerate("database"); i++)
{
SQLhost host;
host.id = conf->ReadValue("database", "id", i);
host.host = conf->ReadValue("database", "hostname", i);
host.port = conf->ReadInteger("database", "port", i, true);
host.name = conf->ReadValue("database", "name", i);
host.user = conf->ReadValue("database", "username", i);
host.pass = conf->ReadValue("database", "password", i);
host.ssl = conf->ReadFlag("database", "ssl", i);
if (h == host)
return true;
}
return false;
}
void ClearOldConnections(ConfigReader* conf)
{
ConnMap::iterator i,safei;
for (i = Connections.begin(); i != Connections.end(); i++)
{
if (!HostInConf(conf, i->second->GetConfHost()))
{
delete i->second;
safei = i;
--i;
Connections.erase(safei);
}
}
}
void ClearAllConnections()
{
ConnMap::iterator i;
while ((i = Connections.begin()) != Connections.end())
{
Connections.erase(i);
delete i->second;
}
}
void ConnectDatabases(InspIRCd* ServerInstance, ModuleSQL* Parent)
{
for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
{
if (i->second->IsEnabled())
continue;
i->second->SetEnable(true);
if (!i->second->Connect())
{
/* XXX: MUTEX */
Parent->LoggingMutex.Lock();
ServerInstance->Logs->Log("m_mysql",DEFAULT,"SQL: Failed to connect database "+i->second->GetHost()+": Error: "+i->second->GetError());
i->second->SetEnable(false);
Parent->LoggingMutex.Unlock();
}
}
}
void LoadDatabases(ConfigReader* conf, InspIRCd* ServerInstance, ModuleSQL* Parent)
{
Parent->ConnMutex.Lock();
ClearOldConnections(conf);
for (int j =0; j < conf->Enumerate("database"); j++)
{
SQLhost host;
host.id = conf->ReadValue("database", "id", j);
host.host = conf->ReadValue("database", "hostname", j);
host.port = conf->ReadInteger("database", "port", j, true);
host.name = conf->ReadValue("database", "name", j);
host.user = conf->ReadValue("database", "username", j);
host.pass = conf->ReadValue("database", "password", j);
host.ssl = conf->ReadFlag("database", "ssl", j);
if (HasHost(host))
continue;
if (!host.id.empty() && !host.host.empty() && !host.name.empty() && !host.user.empty() && !host.pass.empty())
{
SQLConnection* ThisSQL = new SQLConnection(host, Parent);
Connections[host.id] = ThisSQL;
}
}
ConnectDatabases(ServerInstance, Parent);
Parent->ConnMutex.Unlock();
}
char FindCharId(const std::string &id)
{
char i = 1;
for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); ++iter, ++i)
{
if (iter->first == id)
{
return i;
}
}
return 0;
}
ConnMap::iterator GetCharId(char id)
{
char i = 1;
for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); ++iter, ++i)
{
if (i == id)
return iter;
}
return Connections.end();
}
class ModuleSQL;
class DispatcherThread : public SocketThread
{
private:
ModuleSQL* Parent;
InspIRCd* ServerInstance;
public:
DispatcherThread(InspIRCd* Instance, ModuleSQL* CreatorModule) : SocketThread(Instance), Parent(CreatorModule), ServerInstance(Instance) { }
~DispatcherThread() { }
virtual void Run();
virtual void OnNotify();
};
ModuleSQL::ModuleSQL(InspIRCd* Me) : Module(Me), rehashing(false)
{
ServerInstance->Modules->UseInterface("SQLutils");
Conf = new ConfigReader(ServerInstance);
PublicServerInstance = ServerInstance;
currid = 0;
Dispatcher = new DispatcherThread(ServerInstance, this);
ServerInstance->Threads->Start(Dispatcher);
if (!ServerInstance->Modules->PublishFeature("SQL", this))
{
Dispatcher->join();
delete Dispatcher;
ServerInstance->Modules->DoneWithInterface("SQLutils");
throw ModuleException("m_mysql: Unable to publish feature 'SQL'");
}
ServerInstance->Modules->PublishInterface("SQL", this);
Implementation eventlist[] = { I_OnRehash, I_OnRequest };
ServerInstance->Modules->Attach(eventlist, this, 2);
}
ModuleSQL::~ModuleSQL()
{
delete Dispatcher;
ClearAllConnections();
delete Conf;
ServerInstance->Modules->UnpublishInterface("SQL", this);
ServerInstance->Modules->UnpublishFeature("SQL");
ServerInstance->Modules->DoneWithInterface("SQLutils");
}
unsigned long ModuleSQL::NewID()
{
if (currid+1 == 0)
currid++;
return ++currid;
}
const char* ModuleSQL::OnRequest(Request* request)
{
if(strcmp(SQLREQID, request->GetId()) == 0)
{
SQLrequest* req = (SQLrequest*)request;
ConnMap::iterator iter;
const char* returnval = NULL;
Dispatcher->LockQueue();
ConnMutex.Lock();
if((iter = Connections.find(req->dbid)) != Connections.end())
{
req->id = NewID();
iter->second->queue.push(*req);
returnval = SQLSUCCESS;
}
else
{
req->error.Id(SQL_BAD_DBID);
}
ConnMutex.Unlock();
Dispatcher->UnlockQueueWakeup();
/* Yes, it's possible this will generate a spurious wakeup.
* That's fine, it'll just get ignored.
*/
return returnval;
}
return NULL;
}
void ModuleSQL::OnRehash(User* user)
{
Dispatcher->LockQueue();
rehashing = true;
Dispatcher->UnlockQueueWakeup();
}
Version ModuleSQL::GetVersion()
{
return Version("$Id$", VF_VENDOR | VF_SERVICEPROVIDER, API_VERSION);
}
void DispatcherThread::Run()
{
LoadDatabases(Parent->Conf, Parent->PublicServerInstance, Parent);
SQLConnection* conn = NULL;
this->LockQueue();
while (!this->GetExitFlag())
{
if (Parent->rehashing)
{
Parent->rehashing = false;
LoadDatabases(Parent->Conf, Parent->PublicServerInstance, Parent);
}
conn = NULL;
Parent->ConnMutex.Lock();
for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
{
if (i->second->queue.totalsize())
{
conn = i->second;
break;
}
}
Parent->ConnMutex.Unlock();
if (conn)
{
/* There's an item! */
this->UnlockQueue();
conn->DoLeadingQuery();
this->NotifyParent();
this->LockQueue();
conn->queue.pop();
}
else
{
/* We know the queue is empty, we can safely hang this thread until
* something happens
*/
this->WaitForQueue();
}
}
this->UnlockQueue();
}
void DispatcherThread::OnNotify()
{
SQLConnection* conn;
while (1)
{
conn = NULL;
Parent->ConnMutex.Lock();
for (ConnMap::iterator iter = Connections.begin(); iter != Connections.end(); iter++)
{
if (!iter->second->rq.empty())
{
conn = iter->second;
break;
}
}
Parent->ConnMutex.Unlock();
if (!conn)
break;
Parent->ResultsMutex.Lock();
ResultQueue::iterator n = conn->rq.begin();
Parent->ResultsMutex.Unlock();
(*n)->Send();
delete (*n);
Parent->ResultsMutex.Lock();
conn->rq.pop_front();
Parent->ResultsMutex.Unlock();
}
}
MODULE_INIT(ModuleSQL)
