Addition of connect function to dcb functions and added dcb_connect routine

core/dcb.c

@@ -30,6 +30,8 @@
 #include <string.h>
 #include <dcb.h>
 #include <spinlock.h>
+#include <server.h>
+#include <session.h>
 
 static	DCB		*allDCBs = NULL;	/* Diagnotics need a list of DCBs */
 static	SPINLOCK	*dcbspin = NULL;
@@ -104,6 +106,45 @@ free_dcb(DCB *dcb)
 	free(dcb);
 }
 
+/*
+ * Connect to a server
+ *
+ * @param server	The server to connect to
+ * @param session	The session this connection is being made for
+ * @param protcol	The protocol module to use
+ */
+DCB *
+connect_dcb(SERVER *server, SESSION *session, const char *protocol)
+{
+DCB		*dcb;
+GWPROTOCOL	*funcs;
+int		epollfd = -1;	// Need to work out how to get this
+
+	if ((dcb = alloc_dcb()) == NULL)
+	{
+		return NULL;
+	}
+	if ((funcs = load_module(protocol, "Protocol")) == NULL)
+	{
+		free(dcb);
+		return NULL;
+	}
+	memcpy(&(dcb->func), funcs, sizeof(GWPROTOCOL));
+	dcb->session = session;
+
+	if ((dcb->fd = dcb->func.connect(server, session, epollfd)) == -1)
+	{
+		free(dcb);
+		return NULL;
+	}
+	/*
+	 * We are now connected, the authentication etc will happen as
+	 * part of the EPOLLOUT event that will be received once the connection
+	 * is established.
+	 */
+	return dcb;
+}
+
 /*
  * Diagnostic to print a DCB
  *

include/dcb.h

@@ -21,6 +21,7 @@
 #include <buffer.h>
 
 struct session;
+struct server;
 
 /*
  * The function pointer table used by descriptors to call relevant functions
@@ -48,6 +49,8 @@ typedef struct gw_protocol {
 	 *	error		EPOLLERR handler for the socket
 	 *	hangup		EPOLLHUP handler for the socket
 	 *	accept		Accept handler for listener socket only
+	 *	connect		Create a connection to the specified server
+	 *			for the session pased in
 	 *	close		Gateway close entry point for the socket
          */                             
 	int		(*read)(struct dcb *, int);
@@ -56,6 +59,7 @@ typedef struct gw_protocol {
 	int		(*error)(struct dcb *, int);
 	int		(*hangup)(struct dcb *, int);
 	int		(*accept)(struct dcb *, int);
+	int		(*connect)(struct server *, struct session *, int);
 	int		(*close)(struct dcb *, int);
 } GWPROTOCOL;
 
@@ -98,6 +102,7 @@ typedef struct dcb {
 
 extern DCB		*alloc_dcb();			/* Allocate a DCB */
 extern void		free_dcb(DCB *);		/* Free a DCB */
+extern DCB		*connect_dcb(struct server *, struct session *, const char *);
 extern void		printAllDCBs();			/* Debug to print all DCB in the system */
 extern void		printDCB(DCB *);		/* Debug print routine */
 extern const char 	*gw_dcb_state2string(int);	/* DCB state to string */