/* $ModDesc: SQL Service Provider module for all other m_sql* modules */
/* $CompileFlags: `mysql_config --include` */
-/* $LinkerFlags: `mysql_config --libs_r` `perl ../mysql_rpath.pl` */
+/* $LinkerFlags: `mysql_config --libs_r` `perl extra/mysql_rpath.pl` */
+
+/* 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 pthreads, 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://www.inspircd.org/wiki/Mysql2
+ */
class SQLConnection;
+class Notifier;
extern InspIRCd* ServerInstance;
typedef std::map<std::string, SQLConnection*> ConnMap;
bool giveup = false;
+static Module* SQLModule = NULL;
+static Notifier* MessagePipe = NULL;
+int QueueFD = -1;
#if !defined(MYSQL_VERSION_ID) || MYSQL_VERSION_ID<32224
#define mysql_field_count mysql_num_fields
#endif
+typedef std::deque<SQLresult*> ResultQueue;
+
class QueryQueue : public classbase
{
private:
/* A mutex to wrap around queue accesses */
pthread_mutex_t queue_mutex = PTHREAD_MUTEX_INITIALIZER;
+pthread_mutex_t results_mutex = PTHREAD_MUTEX_INITIALIZER;
+
class MySQLresult : public SQLresult
{
int currentrow;
std::vector<std::string> colnames;
std::vector<SQLfieldList> fieldlists;
SQLfieldMap* fieldmap;
+ SQLfieldMap fieldmap2;
+ SQLfieldList emptyfieldlist;
int rows;
- int cols;
+ public:
- MySQLresult(Module* self, Module* to, MYSQL_RES* res, int affected_rows) : SQLresult(self, to), currentrow(0), fieldmap(NULL)
+ MySQLresult(Module* self, Module* to, MYSQL_RES* res, int affected_rows, unsigned int id) : SQLresult(self, to, id), currentrow(0), fieldmap(NULL)
{
/* A number of affected rows from from mysql_affected_rows.
*/
+ log(DEBUG,"Created new MySQLresult of non-error type");
fieldlists.clear();
- rows = affected_rows;
- fieldlists.resize(rows);
- unsigned int field_count;
+ 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)
{
std::string a = (fields[field_count].name ? fields[field_count].name : "");
std::string b = (row[field_count] ? row[field_count] : "");
- SQLfield sqlf(a, !row[field_count]);
+ SQLfield sqlf(b, !row[field_count]);
colnames.push_back(a);
fieldlists[n].push_back(sqlf);
+ log(DEBUG,"Inc field count to %d",field_count+1);
field_count++;
}
n++;
}
+ rows++;
}
- cols = mysql_num_fields(res);
mysql_free_result(res);
}
- cols = field_count;
- log(DEBUG, "Created new MySQL result; %d rows, %d columns", rows, cols);
+ log(DEBUG, "Created new MySQL result; %d rows, %d columns", rows, colnames.size());
+ }
+
+ MySQLresult(Module* self, Module* to, SQLerror e, unsigned int id) : SQLresult(self, to, id), currentrow(0)
+ {
+ rows = 0;
+ error = e;
+ log(DEBUG,"Created new MySQLresult of error type");
}
~MySQLresult()
virtual int Cols()
{
- return cols;
+ return colnames.size();
}
virtual std::string ColName(int column)
virtual SQLfield GetValue(int row, int column)
{
- if ((row >= 0) && (row < rows) && (column >= 0) && (column < cols))
+ if ((row >= 0) && (row < rows) && (column >= 0) && (column < Cols()))
{
return fieldlists[row][column];
}
virtual SQLfieldList& GetRow()
{
- return fieldlists[currentrow];
+ if (currentrow < rows)
+ return fieldlists[currentrow];
+ else
+ return emptyfieldlist;
}
virtual SQLfieldMap& GetRowMap()
{
- fieldmap = new SQLfieldMap();
-
- for (int i = 0; i < cols; i++)
+ fieldmap2.clear();
+
+ if (currentrow < rows)
{
- fieldmap->insert(std::make_pair(colnames[cols],GetValue(currentrow, i)));
+ for (int i = 0; i < Cols(); i++)
+ {
+ fieldmap2.insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
+ }
+ currentrow++;
}
- currentrow++;
- return *fieldmap;
+ return fieldmap2;
}
virtual SQLfieldList* GetRowPtr()
{
- return &fieldlists[currentrow++];
+ 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();
-
- for (int i = 0; i < cols; i++)
+
+ if (currentrow < rows)
{
- fieldmap->insert(std::make_pair(colnames[cols],GetValue(currentrow, i)));
+ for (int i = 0; i < Cols(); i++)
+ {
+ fieldmap->insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
+ }
+ currentrow++;
}
- currentrow++;
return fieldmap;
}
virtual void Free(SQLfieldList* fl)
{
- /* XXX: Yes, this is SUPPOSED to do nothing, we
- * dont want to free our fieldlist until we
- * destruct the object. Unlike the pgsql module,
- * we only have the one.
- */
+ delete fl;
}
};
+class SQLConnection;
+
+void NotifyMainThread(SQLConnection* connection_with_new_result);
+
class SQLConnection : public classbase
{
protected:
std::string db;
std::map<std::string,std::string> thisrow;
bool Enabled;
- long id;
+ std::string id;
public:
QueryQueue queue;
+ ResultQueue rq;
// This constructor creates an SQLConnection object with the given credentials, and creates the underlying
// MYSQL struct, but does not connect yet.
- SQLConnection(std::string thishost, std::string thisuser, std::string thispass, std::string thisdb, long myid)
+ SQLConnection(std::string thishost, std::string thisuser, std::string thispass, std::string thisdb, const std::string &myid)
{
this->Enabled = true;
this->host = thishost;
void DoLeadingQuery()
{
+ if (!CheckConnection())
+ return;
+
/* Parse the command string and dispatch it to mysql */
SQLrequest& req = queue.front();
log(DEBUG,"DO QUERY: %s",req.query.q.c_str());
unsigned long paramlen;
/* Total length of query, used for binary-safety in mysql_real_query */
- unsigned long querylength;
+ unsigned long querylength = 0;
paramlen = 0;
log(DEBUG, "Attempting to dispatch query: %s", query);
pthread_mutex_lock(&queue_mutex);
- req.query.q = std::string(query,querylength);
+ req.query.q = query;
pthread_mutex_unlock(&queue_mutex);
+ log(DEBUG,"REQUEST ID: %d",req.id);
+
if (!mysql_real_query(&connection, req.query.q.data(), req.query.q.length()))
{
/* Successfull query */
res = mysql_use_result(&connection);
- }
-
-
- }
-
- // This method issues a query that expects multiple rows of results. Use GetRow() and QueryDone() to retrieve
- // multiple rows.
- bool QueryResult(std::string query)
- {
- if (!CheckConnection()) return false;
-
- int r = mysql_query(&connection, query.c_str());
- if (!r)
- {
- res = mysql_use_result(&connection);
- }
- return (!r);
- }
-
- // This method issues a query that just expects a number of 'effected' rows (e.g. UPDATE or DELETE FROM).
- // the number of effected rows is returned in the return value.
- long QueryCount(std::string query)
- {
- /* If the connection is down, we return a negative value - New to 1.1 */
- if (!CheckConnection()) return -1;
-
- int r = mysql_query(&connection, query.c_str());
- if (!r)
- {
- res = mysql_store_result(&connection);
unsigned long rows = mysql_affected_rows(&connection);
- mysql_free_result(res);
- return rows;
+ MySQLresult* r = new MySQLresult(SQLModule, 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!
+ */
+ pthread_mutex_lock(&results_mutex);
+ rq.push_back(r);
+ pthread_mutex_unlock(&results_mutex);
}
- return 0;
- }
-
- // This method fetches a row, if available from the database. You must issue a query
- // using QueryResult() first! The row's values are returned as a map of std::string
- // where each item is keyed by the column name.
- std::map<std::string,std::string> GetRow()
- {
- thisrow.clear();
- if (res)
+ else
{
- row = mysql_fetch_row(res);
- if (row)
- {
- unsigned int field_count = 0;
- MYSQL_FIELD *fields = mysql_fetch_fields(res);
- if(mysql_field_count(&connection) == 0)
- return thisrow;
- if (fields && mysql_field_count(&connection))
- {
- while (field_count < mysql_field_count(&connection))
- {
- std::string a = (fields[field_count].name ? fields[field_count].name : "");
- std::string b = (row[field_count] ? row[field_count] : "");
- thisrow[a] = b;
- field_count++;
- }
- return thisrow;
- }
- }
+ /* XXX: See /usr/include/mysql/mysqld_error.h for a list of
+ * possible error numbers and error messages */
+ log(DEBUG,"SQL ERROR: %s",mysql_error(&connection));
+ SQLerror e(QREPLY_FAIL, ConvToStr(mysql_errno(&connection)) + std::string(": ") + mysql_error(&connection));
+ MySQLresult* r = new MySQLresult(SQLModule, req.GetSource(), e, req.id);
+ r->dbid = this->GetID();
+ r->query = req.query.q;
+
+ pthread_mutex_lock(&results_mutex);
+ rq.push_back(r);
+ pthread_mutex_unlock(&results_mutex);
}
- return thisrow;
- }
- bool QueryDone()
- {
- if (res)
- {
- mysql_free_result(res);
- res = NULL;
- return true;
- }
- else return false;
+ /* Now signal the main thread that we've got a result to process.
+ * Pass them this connection id as what to examine
+ */
+
+ NotifyMainThread(this);
}
bool ConnectionLost()
return mysql_error(&connection);
}
- long GetID()
+ const std::string& GetID()
{
return id;
}
return host;
}
- void Enable()
- {
- Enabled = true;
- }
-
- void Disable()
+ void SetEnable(bool Enable)
{
- Enabled = false;
+ Enabled = Enable;
}
bool IsEnabled()
{
for (ConnMap::iterator i = Connections.begin(); i != Connections.end(); i++)
{
- i->second->Enable();
+ i->second->SetEnable(true);
if (i->second->Connect())
{
Srv->Log(DEFAULT,"SQL: Successfully connected database "+i->second->GetHost());
else
{
Srv->Log(DEFAULT,"SQL: Failed to connect database "+i->second->GetHost()+": Error: "+i->second->GetError());
- i->second->Disable();
+ i->second->SetEnable(false);
}
}
}
Srv->Log(DEBUG,"Read database settings");
if ((db != "") && (host != "") && (user != "") && (id != "") && (pass != ""))
{
- SQLConnection* ThisSQL = new SQLConnection(host,user,pass,db,atoi(id.c_str()));
+ SQLConnection* ThisSQL = new SQLConnection(host,user,pass,db,id);
Srv->Log(DEFAULT,"Loaded database: "+ThisSQL->GetHost());
Connections[id] = ThisSQL;
Srv->Log(DEBUG,"Pushed back connection");
ConnectDatabases(Srv);
}
+void NotifyMainThread(SQLConnection* connection_with_new_result)
+{
+ /* Here we write() to the socket the main thread has open
+ * and we connect()ed back to before our thread became active.
+ * The main thread is using a nonblocking socket tied into
+ * the socket engine, so they wont block and they'll receive
+ * nearly instant notification. Because we're in a seperate
+ * thread, we can just use standard connect(), and we can
+ * block if we like. We just send the connection id of the
+ * connection back.
+ */
+ log(DEBUG,"Notify of result on connection: %s",connection_with_new_result->GetID().c_str());
+ if (send(QueueFD, connection_with_new_result->GetID().c_str(), connection_with_new_result->GetID().length()+1, 0) < 1) // add one for null terminator
+ {
+ log(DEBUG,"Error writing to QueueFD: %s",strerror(errno));
+ }
+ log(DEBUG,"Sent it on its way via fd=%d",QueueFD);
+}
+
void* DispatcherThread(void* arg);
+class Notifier : public InspSocket
+{
+ insp_sockaddr sock_us;
+ socklen_t uslen;
+ Server* Srv;
+
+ public:
+
+ /* Create a socket on a random port. Let the tcp stack allocate us an available port */
+#ifdef IPV6
+ Notifier(Server* S) : InspSocket("::1", 0, true, 3000), Srv(S)
+#else
+ Notifier(Server* S) : InspSocket("127.0.0.1", 0, true, 3000), Srv(S)
+#endif
+ {
+ uslen = sizeof(sock_us);
+ if (getsockname(this->fd,(sockaddr*)&sock_us,&uslen))
+ {
+ throw ModuleException("Could not create random listening port on localhost");
+ }
+ }
+
+ Notifier(int newfd, char* ip, Server* S) : InspSocket(newfd, ip), Srv(S)
+ {
+ log(DEBUG,"Constructor of new socket");
+ }
+
+ /* Using getsockname and ntohs, we can determine which port number we were allocated */
+ int GetPort()
+ {
+#ifdef IPV6
+ return ntohs(sock_us.sin6_port);
+#else
+ return ntohs(sock_us.sin_port);
+#endif
+ }
+
+ virtual int OnIncomingConnection(int newsock, char* ip)
+ {
+ log(DEBUG,"Inbound connection on fd %d!",newsock);
+ Notifier* n = new Notifier(newsock, ip, Srv);
+ Srv->AddSocket(n);
+ return true;
+ }
+
+ virtual bool OnDataReady()
+ {
+ log(DEBUG,"Inbound data!");
+ char* data = this->Read();
+ ConnMap::iterator iter;
+
+ if (data && *data)
+ {
+ log(DEBUG,"Looking for connection %s",data);
+ /* We expect to be sent a null terminated string */
+ if((iter = Connections.find(data)) != Connections.end())
+ {
+ log(DEBUG,"Found it!");
+
+ /* Lock the mutex, send back the data */
+ pthread_mutex_lock(&results_mutex);
+ ResultQueue::iterator n = iter->second->rq.begin();
+ (*n)->Send();
+ iter->second->rq.pop_front();
+ pthread_mutex_unlock(&results_mutex);
+ return true;
+ }
+ }
+
+ return false;
+ }
+};
+
class ModuleSQL : public Module
{
public:
char* OnRequest(Request* request)
{
- if(strcmp(SQLREQID, request->GetData()) == 0)
+ if(strcmp(SQLREQID, request->GetId()) == 0)
{
SQLrequest* req = (SQLrequest*)request;
if((iter = Connections.find(req->dbid)) != Connections.end())
{
- iter->second->queue.push(*req);
req->id = NewID();
+ iter->second->queue.push(*req);
returnval = SQLSUCCESS;
}
else
return returnval;
}
- log(DEBUG, "Got unsupported API version string: %s", request->GetData());
+ log(DEBUG, "Got unsupported API version string: %s", request->GetId());
return NULL;
}
Srv = Me;
Conf = new ConfigReader();
currid = 0;
+ SQLModule = this;
+
+ MessagePipe = new Notifier(Srv);
+ Srv->AddSocket(MessagePipe);
+ log(DEBUG,"Bound notifier to 127.0.0.1:%d",MessagePipe->GetPort());
+
pthread_attr_t attribs;
pthread_attr_init(&attribs);
pthread_attr_setdetachstate(&attribs, PTHREAD_CREATE_DETACHED);
{
throw ModuleException("m_mysql: Failed to create dispatcher thread: " + std::string(strerror(errno)));
}
- Srv->PublishFeature("SQL", this);
- Srv->PublishFeature("MySQL", this);
+ if (!Srv->PublishFeature("SQL", this))
+ {
+ /* Tell worker thread to exit NOW */
+ giveup = true;
+ throw ModuleException("m_mysql: Unable to publish feature 'SQL'");
+ }
}
virtual ~ModuleSQL()
void* DispatcherThread(void* arg)
{
+ log(DEBUG,"Starting Dispatcher thread, mysql version %d",mysql_get_client_version());
ModuleSQL* thismodule = (ModuleSQL*)arg;
LoadDatabases(thismodule->Conf, thismodule->Srv);
+ /* Connect back to the Notifier */
+
+ if ((QueueFD = socket(AF_FAMILY, SOCK_STREAM, 0)) == -1)
+ {
+ /* crap, we're out of sockets... */
+ log(DEBUG,"QueueFD cant be created");
+ return NULL;
+ }
+
+ log(DEBUG,"Initialize QueueFD to %d",QueueFD);
+
+ insp_sockaddr addr;
+
+#ifdef IPV6
+ insp_aton("::1", &addr.sin6_addr);
+ addr.sin6_family = AF_FAMILY;
+ addr.sin6_port = htons(MessagePipe->GetPort());
+#else
+ insp_inaddr ia;
+ insp_aton("127.0.0.1", &ia);
+ addr.sin_family = AF_FAMILY;
+ addr.sin_addr = ia;
+ addr.sin_port = htons(MessagePipe->GetPort());
+#endif
+
+ if (connect(QueueFD, (sockaddr*)&addr,sizeof(addr)) == -1)
+ {
+ /* wtf, we cant connect to it, but we just created it! */
+ log(DEBUG,"QueueFD cant connect!");
+ return NULL;
+ }
+
+ log(DEBUG,"Connect QUEUE FD");
+
while (!giveup)
{
SQLConnection* conn = NULL;
/* Theres an item! */
if (conn)
{
+ log(DEBUG,"Process Leading query");
conn->DoLeadingQuery();
/* XXX: Lock */
{
return new ModuleSQLFactory;
}
-
projects / user / henk / code / inspircd.git / blobdiff