Fix in-source builds

The internal header directory conflicted with in-source builds causing a
build failure. This is fixed by renaming the internal header directory to
something other than maxscale.

The renaming pointed out a few problems in a couple of source files that
appeared to include internal headers when the headers were in fact public
headers.

Fixed maxctrl in-source builds by making the copying of the sources
optional.

server/core/internal/monitor.h

@@ -0,0 +1,121 @@
+#pragma once
+/*
+ * 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/bsl11.
+ *
+ * Change Date: 2020-01-01
+ *
+ * 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 core/maxscale/monitor.h - The private monitor interface
+ */
+
+#include <maxscale/monitor.h>
+#include "externcmd.h"
+
+MXS_BEGIN_DECLS
+
+#define MON_ARG_MAX 8192
+
+#define DEFAULT_CONNECT_TIMEOUT 3
+#define DEFAULT_READ_TIMEOUT 1
+#define DEFAULT_WRITE_TIMEOUT 2
+#define DEFAULT_CONNECTION_ATTEMPTS 1
+
+#define DEFAULT_MONITOR_INTERVAL 2000 // in milliseconds
+
+/** Default maximum journal age in seconds */
+#define DEFAULT_JOURNAL_MAX_AGE 28800
+
+/** Default script execution timeout in seconds */
+#define DEFAULT_SCRIPT_TIMEOUT 90
+
+/**
+ * Monitor network timeout types
+ */
+typedef enum
+{
+    MONITOR_CONNECT_TIMEOUT = 0,
+    MONITOR_READ_TIMEOUT    = 1,
+    MONITOR_WRITE_TIMEOUT   = 2,
+    MONITOR_CONNECT_ATTEMPTS = 3
+} monitor_timeouts_t;
+
+MXS_MONITOR *monitor_alloc(const char *, const char *);
+void monitor_free(MXS_MONITOR *);
+
+void monitorStart(MXS_MONITOR *, const MXS_CONFIG_PARAMETER*);
+void monitorStop(MXS_MONITOR *);
+void monitorDestroy(MXS_MONITOR* monitor);
+void monitorStopAll();
+void monitorStartAll();
+
+MXS_MONITOR *monitor_find(const char *);
+MXS_MONITOR* monitor_repurpose_destroyed(const char* name, const char* module);
+
+void monitorShow(DCB *, MXS_MONITOR *);
+void monitorShowAll(DCB *);
+
+void monitorList(DCB *);
+RESULTSET *monitorGetList();
+
+bool monitorAddServer(MXS_MONITOR *mon, SERVER *server);
+void monitorRemoveServer(MXS_MONITOR *mon, SERVER *server);
+void monitorAddUser(MXS_MONITOR *, const char *, const char *);
+void monitorAddParameters(MXS_MONITOR *monitor, MXS_CONFIG_PARAMETER *params);
+bool monitorRemoveParameter(MXS_MONITOR *monitor, const char *key);
+
+void monitorSetInterval (MXS_MONITOR *, unsigned long);
+bool monitorSetNetworkTimeout(MXS_MONITOR *, int, int, const char*);
+void monitorSetJournalMaxAge(MXS_MONITOR *mon, time_t value);
+void monitorSetScriptTimeout(MXS_MONITOR *mon, uint32_t value);
+
+/**
+ * @brief Serialize a monitor to a file
+ *
+ * This converts the static configuration of the monitor into an INI format file.
+ *
+ * @param monitor Monitor to serialize
+ * @return True if serialization was successful
+ */
+bool monitor_serialize(const MXS_MONITOR *monitor);
+
+/**
+ * Check if a server is being monitored and return the monitor.
+ * @param server Server that is queried
+ * @return The monitor watching this server, or NULL if not monitored
+ */
+MXS_MONITOR* monitor_server_in_use(const SERVER *server);
+
+/**
+ * Launch a script
+ *
+ * @param mon     Owning monitor
+ * @param ptr     The server which has changed state
+ * @param script  Script to execute
+ * @param timeout Timeout in seconds for the script
+ *
+ * @return Return value of the executed script or -1 on error
+ */
+int monitor_launch_script(MXS_MONITOR* mon, MXS_MONITORED_SERVER* ptr, const char* script, uint32_t timeout);
+
+/**
+ * Launch a command
+ *
+ * @param mon  Owning monitor
+ * @param ptr  The server which has changed state
+ * @param cmd  The command to execute.
+ *
+ * @note All default script variables will be replaced.
+ *
+ * @return Return value of the executed script or -1 on error.
+ */
+int monitor_launch_command(MXS_MONITOR* mon, MXS_MONITORED_SERVER* ptr, EXTERNCMD* cmd);
+
+MXS_END_DECLS