Move headers from server/include to include/maxscale

- Headers now to be included as <maxscale/xyz.h>
- First step, no cleanup of headers has been made. Only moving
  from one place to another + necessary modifications.

include/maxscale/router.h

@@ -0,0 +1,105 @@
+#ifndef _ROUTER_H
+#define _ROUTER_H
+/*
+ * Copyright (c) 2016 MariaDB Corporation Ab
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file and at www.mariadb.com/bsl.
+ *
+ * Change Date: 2019-07-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2 or later of the General
+ * Public License.
+ */
+
+/**
+ * @file router.h -  The query router interface mechanisms
+ *
+ * Revision History
+ *
+ * Date         Who                 Description
+ * 14/06/2013   Mark Riddoch        Initial implementation
+ * 26/06/2013   Mark Riddoch        Addition of router options and the diagnostic entry point
+ * 15/07/2013   Massimiliano Pinto  Added clientReply entry point
+ * 16/07/2013   Massimiliano Pinto  Added router commands values
+ * 22/10/2013   Massimiliano Pinto  Added router errorReply entry point
+ * 27/10/2015   Martin Brampton     Add RCAP_TYPE_NO_RSESSION
+ *
+ */
+#include <maxscale/service.h>
+#include <maxscale/session.h>
+#include <maxscale/buffer.h>
+#include <stdint.h>
+
+/**
+ * The ROUTER handle points to module specific data, so the best we can do
+ * is to make it a void * externally.
+ */
+typedef void *ROUTER;
+
+typedef enum error_action
+{
+    ERRACT_NEW_CONNECTION = 0x001,
+    ERRACT_REPLY_CLIENT   = 0x002
+} error_action_t;
+
+/**
+ * @verbatim
+ * The "module object" structure for a query router module
+ *
+ * The entry points are:
+ *  createInstance  Called by the service to create a new instance of the query router
+ *  newSession      Called to create a new user session within the query router
+ *  closeSession    Called when a session is closed
+ *  routeQuery      Called on each query that requires routing
+ *  diagnostics     Called to force the router to print diagnostic output
+ *  clientReply     Called to reply to client the data from one or all backends
+ *  errorReply      Called to reply to client errors with optional closeSession or make a request for
+ *                  a new backend connection
+ *
+ * @endverbatim
+ *
+ * @see load_module
+ */
+typedef struct router_object
+{
+    ROUTER *(*createInstance)(SERVICE *service, char **options);
+    void   *(*newSession)(ROUTER *instance, SESSION *session);
+    void    (*closeSession)(ROUTER *instance, void *router_session);
+    void    (*freeSession)(ROUTER *instance, void *router_session);
+    int     (*routeQuery)(ROUTER *instance, void *router_session, GWBUF *queue);
+    void    (*diagnostics)(ROUTER *instance, DCB *dcb);
+    void    (*clientReply)(ROUTER* instance, void* router_session, GWBUF* queue, DCB *backend_dcb);
+    void    (*handleError)(ROUTER*        instance,
+                           void*          router_session,
+                           GWBUF*         errmsgbuf,
+                           DCB*           backend_dcb,
+                           error_action_t action,
+                           bool*          succp);
+    int     (*getCapabilities)();
+} ROUTER_OBJECT;
+
+/**
+ * The router module API version. Any change that changes the router API
+ * must update these versions numbers in accordance with the rules in
+ * modinfo.h.
+ */
+#define ROUTER_VERSION  { 1, 0, 0 }
+
+/**
+ * Router capability type. Indicates what kind of input router accepts.
+ */
+typedef enum router_capability_t
+{
+    RCAP_TYPE_UNDEFINED     = 0x00,
+    RCAP_TYPE_STMT_INPUT    = 0x01, /**< Statement per buffer */
+    RCAP_TYPE_PACKET_INPUT  = 0x02, /**< Data as it was read from DCB */
+    RCAP_TYPE_NO_RSESSION   = 0x04, /**< Router does not use router sessions */
+    RCAP_TYPE_NO_USERS_INIT = 0x08  /**< Prevent the loading of authenticator
+                                       users when the service is started */
+} router_capability_t;
+
+
+
+#endif