[2472] Move choice of DHCP6 lease manager to main

Before this change, the choice of lease manager was set in
ControlledDhcpv6Srv.  This means that unit tests for that code
always used the MySQL lease manager (if present).  This change
ensures that unit tests always use the Memfile manager.

src/bin/dhcp6/ctrl_dhcp6_srv.cc

@@ -39,19 +39,6 @@ using namespace isc::log;
 using namespace isc::util;
 using namespace std;
 
-namespace {
-// @todo: Replace the next line by extraction from configuration parameters
-// This is the "dbconfig" string for the MySQL database.  It is likely
-// that a long-term solution will be to create the instance of the lease manager
-// somewhere other than the Dhcpv6Srv constructor, to give time to extract
-// the connection string from the configuration database.
-#ifdef HAVE_MYSQL
-const char* DBCONFIG = "type=mysql name=kea user=kea password=kea host=localhost";
-#else
-const char* DBCONFIG = "type=memfile";
-#endif
-};
-
 namespace isc {
 namespace dhcp {
 
@@ -163,8 +150,8 @@ void ControlledDhcpv6Srv::disconnectSession() {
     IfaceMgr::instance().set_session_socket(IfaceMgr::INVALID_SOCKET, NULL);
 }
 
-ControlledDhcpv6Srv::ControlledDhcpv6Srv(uint16_t port)
-    : Dhcpv6Srv(port, DBCONFIG), cc_session_(NULL), config_session_(NULL) {
+ControlledDhcpv6Srv::ControlledDhcpv6Srv(uint16_t port, const char* dbconfig)
+    : Dhcpv6Srv(port, dbconfig), cc_session_(NULL), config_session_(NULL) {
     server_ = this; // remember this instance for use in callback
 }
 

src/bin/dhcp6/ctrl_dhcp6_srv.h

@@ -41,7 +41,9 @@ public:
     /// @brief Constructor
     ///
     /// @param port UDP port to be opened for DHCP traffic
-    ControlledDhcpv6Srv(uint16_t port = DHCP6_SERVER_PORT);
+    /// @param dbconfig Lease manager database configuration string
+    ControlledDhcpv6Srv(uint16_t port = DHCP6_SERVER_PORT,
+                        const char* dbconfig = "type=memfile");
 
     /// @brief Destructor.
     ~ControlledDhcpv6Srv();

src/bin/dhcp6/main.cc

@@ -34,6 +34,16 @@ using namespace std;
 /// Dhcpv6Srv and other classes, see \ref dhcpv6Session.
 
 namespace {
+// @todo: Replace the next line by extraction from configuration parameters
+// This is the "dbconfig" string for the MySQL database.  It is likely
+// that a long-term solution will be to create the instance of the lease manager
+// somewhere other than the Dhcpv6Srv constructor, to give time to extract
+// the connection string from the configuration database.
+#ifdef HAVE_MYSQL
+const char* DBCONFIG = "type=mysql name=kea user=kea password=kea host=localhost";
+#else
+const char* DBCONFIG = "type=memfile";
+#endif
 
 const char* const DHCP6_NAME = "b10-dhcp6";
 
@@ -102,7 +112,7 @@ main(int argc, char* argv[]) {
 
     int ret = EXIT_SUCCESS;
     try {
-        ControlledDhcpv6Srv server(port_number);
+        ControlledDhcpv6Srv server(port_number, DBCONFIG);
         if (!stand_alone) {
             try {
                 server.establishSession();