Okay..updates to u_listmode, general cleanups and add some virtual methods which subclasses can override to alter behaviour..all looking much nicer and more flexible now.

Update m_chanfilter to use u_listmode, demonstrates most or all of the new features of it and looks a hell of a lot prettier :)

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@4201 e03df62e-2008-0410-955e-edbf42e46eb7

2 files changed, 122 insertions, 66 deletions

diff --git a/src/modules/extra/m_pgsql.cpp b/src/modules/extra/m_pgsql.cpp
index c44c66bc8..14e32ac36 100644
--- a/src/modules/extra/m_pgsql.cpp
+++ b/src/modules/extra/m_pgsql.cpp
@@ -57,14 +57,6 @@ typedef std::map<std::string, SQLConn*> ConnMap;
  */
 enum SQLstatus { CREAD, CWRITE, WREAD, WWRITE };
 
-inline std::string pop_front_r(std::deque<std::string> &d)
-{
-	std::string r = d.front();
-	d.pop_front();
-	return r;
-
-}
-
 /** QueryQueue, a queue of queries waiting to be executed.
  * This maintains two queues internally, one for 'priority'
  * queries and one for less important ones. Each queue has
@@ -74,21 +66,38 @@ inline std::string pop_front_r(std::deque<std::string> &d)
  * queries in the priority queue they will be executed first,
  * 'unimportant' queries will only be executed when the
  * priority queue is empty.
+ *
+ * These are lists of SQLresult so we can, from the moment the
+ * SQLrequest is recieved, be beginning to construct the result
+ * object. The copy in the deque can then be submitted in-situ
+ * and finally deleted from this queue. No copies of the SQLresult :)
+ *
+ * Because we work on the SQLresult in-situ, we need a way of accessing the
+ * result we are currently processing, QueryQueue::front(), but that call
+ * needs to always return the same element until that element is removed
+ * from the queue, this is what the 'which' variable is. New queries are
+ * always added to the back of one of the two queues, but if when front()
+ * is first called then the priority queue is empty then front() will return
+ * a query from the normal queue, but if a query is then added to the priority
+ * queue then front() must continue to return the front of the *normal* queue
+ * until pop() is called.
  */
 
 class QueryQueue
 {
 private:
-	std::deque<std::string> priority;	/* The priority queue */
-	std::deque<std::string> normal;		/* The 'normal' queue */
+	std::deque<SQLresult> priority;	/* The priority queue */
+	std::deque<SQLresult> normal;	/* The 'normal' queue */
+	enum { PRI, NOR, NON } which;	/* Which queue the currently active element is at the front of */
 
 public:
 	QueryQueue()
+	: which(NON)
 	{
 	
 	}
 	
-	void push_back(const std::string &q, bool pri = false)
+	void push(const Query &q, bool pri = false)
 	{
 		log(DEBUG, "QueryQueue::push_back(): Adding %s query to queue: %s", ((pri) ? "priority" : "non-priority"), q.c_str());
 		
@@ -98,21 +107,47 @@ public:
 			normal.push_back(q);
 	}
 	
-	inline std::string pop_front()
+	void pop()
 	{
-		std::string res;
-		
-		if(priority.size())
+		if((which == PRI) && priority.size())
 		{
-			return pop_front_r(priority);
+			priority.pop_front();
 		}
-		else if(normal.size())
+		else if((which == NOR) && normal.size())
 		{
-			return pop_front_r(normal);
+			normal.pop_front();
 		}
-		else
+		
+		/* Silently do nothing if there was no element to pop() */
+	}
+	
+	SQLresult& front()
+	{
+		switch(which)
 		{
-			return "";	
+			case PRI:
+				return priority.front();
+			case NOR:
+				return normal.front();
+			default:
+				if(priority.size())
+				{
+					which = PRI;
+					return priority.front();
+				}
+				
+				if(normal.size())
+				{
+					which = NOR;
+					return normal.front();
+				}
+				
+				/* This will probably result in a segfault,
+				 * but the caller should have checked totalsize()
+				 * first so..meh - moron :p
+				 */
+				
+				return priority.front();
 		}
 	}
 	
@@ -120,6 +155,11 @@ public:
 	{
 		return std::make_pair(priority.size(), normal.size());
 	}
+	
+	int totalsize()
+	{
+		return priority.size() + normal.size();
+	}
 };
 
 /** SQLConn represents one SQL session.
@@ -141,14 +181,16 @@ private:
 	bool			ssl;	/* If we should require SSL */
 	PGconn* 		sql;	/* PgSQL database connection handle */
 	SQLstatus		status;	/* PgSQL database connection status */
+	bool			qinprog;/* If there is currently a query in progress */
+	QueryQueue		queue;	/* Queue of queries waiting to be executed on this connection */
+	Query			query;	/* The currently active query on this connection */
 
 public:
-	QueryQueue		queue;	/* Queue of queries waiting to be executed on this connection */
 
 	/* This class should only ever be created inside this module, using this constructor, so we don't have to worry about the default ones */
 
 	SQLConn(Server* srv, const std::string &h, unsigned int p, const std::string &d, const std::string &u, const std::string &pwd, bool s)
-	: InspSocket::InspSocket(), Srv(srv), dbhost(h), dbport(p), dbname(d), dbuser(u), dbpass(pwd), ssl(s), sql(NULL), status(CWRITE)
+	: InspSocket::InspSocket(), Srv(srv), dbhost(h), dbport(p), dbname(d), dbuser(u), dbpass(pwd), ssl(s), sql(NULL), status(CWRITE), qinprog(false)
 	{
 		log(DEBUG, "Creating new PgSQL connection to database %s on %s:%u (%s/%s)", dbname.c_str(), dbhost.c_str(), dbport, dbuser.c_str(), dbpass.c_str());
 
@@ -191,7 +233,7 @@ public:
 	
 	~SQLConn()
 	{
-		
+		Close();
 	}
 	
 	bool DoResolve()
@@ -280,11 +322,14 @@ public:
 	
 	virtual void Close()
 	{
+		log(DEBUG,"SQLConn::Close");
+		
+		if(this->fd > 01)
+			socket_ref[this->fd] = NULL;
 		this->fd = -1;
 		this->state = I_ERROR;
 		this->OnError(I_ERR_SOCKET);
 		this->ClosePending = true;
-		log(DEBUG,"SQLConn::Close");
 		
 		if(sql)
 		{
@@ -303,20 +348,18 @@ public:
 				log(DEBUG, "PGconnectPoll: PGRES_POLLING_WRITING");
 				WantWrite();
 				status = CWRITE;
-				DoPoll();
-				break;
+				return DoPoll();
 			case PGRES_POLLING_READING:
 				log(DEBUG, "PGconnectPoll: PGRES_POLLING_READING");
 				status = CREAD;
 				break;
 			case PGRES_POLLING_FAILED:
 				log(DEBUG, "PGconnectPoll: PGRES_POLLING_FAILED: %s", PQerrorMessage(sql));
-				Close();
 				return false;
 			case PGRES_POLLING_OK:
 				log(DEBUG, "PGconnectPoll: PGRES_POLLING_OK");
 				status = WWRITE;
-				break;
+				return DoConnectedPoll()
 			default:
 				log(DEBUG, "PGconnectPoll: wtf?");
 				break;
@@ -325,8 +368,15 @@ public:
 		return true;
 	}
 	
-	bool ProcessData()
+	bool DoConnectedPoll()
 	{
+		if(!qinprog && queue.totalsize())
+		{
+			/* There's no query currently in progress, and there's queries in the queue. */
+			query = queue.pop_front();
+			DoQuery();
+		}
+		
 		if(PQconsumeInput(sql))
 		{
 			log(DEBUG, "PQconsumeInput succeeded");
@@ -353,6 +403,8 @@ public:
 						
 					PQclear(result);
 				}
+				
+				qinprog = false;
 			}
 			
 			return true;
@@ -420,13 +472,15 @@ public:
 	
 	bool DoEvent()
 	{
+		bool ret;
+		
 		if((status == CREAD) || (status == CWRITE))
 		{
-			DoPoll();
+			ret = DoPoll();
 		}
 		else
 		{
-			ProcessData();
+			ret = DoConnectedPoll();
 		}
 		
 		switch(PQflush(sql))
@@ -443,7 +497,7 @@ public:
 				break;
 		}
 
-		return true;
+		return ret;
 	}
 	
 	std::string MkInfoStr()
@@ -482,39 +536,30 @@ public:
 		return "Err...what, erm..BUG!";
 	}
 	
-	bool Query(const std::string &query)
+	SQLerror Query(const Query &query, bool pri)
 	{
+		queue.push_back(query, pri);
+		
 		if((status == WREAD) || (status == WWRITE))
 		{
-			if(PQsendQuery(sql, query.c_str()))
+			if(!qinprog)
 			{
-				log(DEBUG, "Dispatched query: %s", query.c_str());
-				return true;
-			}
-			else
-			{
-				log(DEBUG, "Failed to dispatch query: %s", PQerrorMessage(sql));
-				return false;
+				if(PQsendQuery(sql, query.c_str()))
+				{
+					log(DEBUG, "Dispatched query: %s", query.c_str());
+					qinprog = true;
+					return SQLerror();
+				}
+				else
+				{
+					log(DEBUG, "Failed to dispatch query: %s", PQerrorMessage(sql));
+					return SQLerror(QSEND_FAIL, PQerrorMessage(sql));
+				}
 			}
 		}
 
 		log(DEBUG, "Can't query until connection is complete");
-		return false;
-	}
-
-	virtual void OnClose()
-	{
-		/* Close PgSQL connection */
-	}
-
-	virtual void OnError(InspSocketError e)
-	{
-		/* Unsure if we need this, we should be reading/writing via the PgSQL API rather than the insp one... */
-	}
-	
-	virtual void OnTimeout()
-	{
-		/* Unused, I think */
+		return SQLerror(BAD_CONN, "Can't query until connection is complete");
 	}
 };
 
@@ -584,7 +629,7 @@ public:
 			if((iter = connections.find(req->dbid)) != connections.end())
 			{
 				/* Execute query */
-				iter->second->queue.push_back(req->query, req->pri);
+				req->error = iter->second->Query(Query(req->query, req->GetSource(), this), req->pri);
 				
 				return SQLSUCCESS;
 			}
diff --git a/src/modules/extra/m_sqlv2.h b/src/modules/extra/m_sqlv2.h
index 521a95640..5faa76cc2 100644
--- a/src/modules/extra/m_sqlv2.h
+++ b/src/modules/extra/m_sqlv2.h
@@ -8,19 +8,15 @@
 #include <string>
 #include "modules.h"
 
-enum SQLerrorNum { BAD_DBID };
+enum SQLerrorNum { NO_ERROR, BAD_DBID, BAD_CONN, QSEND_FAIL };
 
 class SQLerror
 {
 	SQLerrorNum id;
+	std::string str;
 public:
-	
-	SQLerror()
-	{	
-	}
-	
-	SQLerror(SQLerrorNum i)
-	: id(i)
+	SQLerror(SQLerrorNum i = NO_ERROR, const std::string &s = "")
+	: id(i), str(s)
 	{	
 	}
 	
@@ -29,12 +25,26 @@ public:
 		id = i;
 	}
 	
+	void Str(const std::string &s)
+	{
+		str = s;
+	}
+	
 	const char* Str()
 	{
+		if(str.length())
+			return str.c_str();
+		
 		switch(id)
 		{
+			case NO_ERROR:
+				return "No error";
 			case BAD_DBID:
 				return "Invalid database ID";
+			case BAD_CONN:
+				return "Invalid connection";
+			case QSEND_FAIL:
+				return "Sending query failed";
 			default:
 				return "Unknown error";				
 		}
@@ -57,6 +67,7 @@ public:
 
 class SQLresult : public Request
 {
+	
 public:
 	SQLresult(Module* s, Module* d)
 	: Request(SQLRESID, s, d)