[5046] Fixed logger setup on set-config

src/bin/dhcp6/ctrl_dhcp6_srv.cc
    ControlledDhcpv6Srv::commandSetConfigHandler()
    - Add logger config
    - Use processConfig() directly instead of config-reload command

src/bin/dhcp6/kea_controller.cc
    configure(const std::string& file_name)
      - Remove logger config
      - Use set-config command instead of config-reload

src/bin/dhcp6/tests/ctrl_dhcp6_srv_unittest.cc
    createUnixChannelServer()
    - added call to initLogger() to revert logging to unit test logger

src/bin/dhcp6/tests/dhcp6_test_utils.cc
    BaseServerTest::~BaseServerTest() {
    - added call to initLogger() to revert logging to unit test logger

src/bin/dhcp6/ctrl_dhcp6_srv.cc

@@ -80,6 +80,12 @@ ControlledDhcpv6Srv::commandSetConfigHandler(const string&,
     // Throw out the preivous staging config that may be present
     CfgMgr::instance().rollback();
 
+    // Logging is a sibling element and so, has to be explicitly
+    // configured. We should call configureLogger even if there's no
+    // Logging element as this will revert it to default logging.
+    Daemon::configureLogger(args->get("Logging"),
+                            CfgMgr::instance().getStagingCfg());
+
     // Command arguments are expected to be:
     // { "Dhcp6": { ... }, "Logging": { ... } }
     // The Logging component is technically optional, but very recommended.
@@ -100,10 +106,8 @@ ControlledDhcpv6Srv::commandSetConfigHandler(const string&,
                                                            message);
         return (result);
     }
-
-    // Now that we have extracted the configuration, reuse the reload command
-    // to configure the server.
-    return (ControlledDhcpv6Srv::processCommand("config-reload", dhcp6));
+    // Now we configure the server proper.
+    return (processConfig(dhcp6));
 }
 
 

src/bin/dhcp6/kea_controller.cc

@@ -72,29 +72,14 @@ void configure(const std::string& file_name) {
                       " Did you forget to add { } around your configuration?");
         }
 
-        // Let's configure logging before applying the configuration,
-        // so we can log things during configuration process.
-        // If there's no logging element, we'll just pass NULL pointer,
-        // which will be handled by configureLogger().
-        Daemon::configureLogger(json->get("Logging"),
-                                CfgMgr::instance().getStagingCfg());
-
-        // Get Dhcp6 component from the config
-        dhcp6 = json->get("Dhcp6");
-
-        if (!dhcp6) {
-            isc_throw(isc::BadValue, "no mandatory 'Dhcp6' entry in"
-                      " the configuration");
-        }
-
         // Use parsed JSON structures to configure the server
-        result = ControlledDhcpv6Srv::processCommand("config-reload", dhcp6);
+        result = ControlledDhcpv6Srv::processCommand("set-config", json);
         if (!result) {
             // Undetermined status of the configuration. This should never
             // happen, but as the configureDhcp6Server returns a pointer, it is
             // theoretically possible that it will return NULL.
             isc_throw(isc::BadValue, "undefined result of "
-                      "processCommand(\"config-reload\", dhcp6)");
+                      "processCommand(\"set-config\", dhcp6)");
         }
 
         // Now check is the returned result is successful (rcode=0) or not
@@ -117,7 +102,6 @@ void configure(const std::string& file_name) {
         isc_throw(isc::BadValue, "configuration error using file '"
                   << file_name << "': " << ex.what());
     }
-
 }
 
 /// @brief Signals handler for DHCPv6 server.

src/bin/dhcp6/tests/ctrl_dhcp6_srv_unittest.cc

@@ -15,6 +15,7 @@
 #include <dhcp6/ctrl_dhcp6_srv.h>
 #include <dhcp6/tests/dhcp6_test_utils.h>
 #include <hooks/hooks_manager.h>
+#include <log/logger_support.h>
 #include <stats/stats_mgr.h>
 #include <testutils/unix_control_client.h>
 
@@ -150,6 +151,11 @@ public:
         ConstElementPtr answer = server_->processConfig(config);
         ASSERT_TRUE(answer);
 
+        // If the configuration doesn't contain logging config, processConfig()
+        // will revert the logging to default (stdout). We call initLogger()
+        // to restore unit test logging.
+        isc::log::initLogger();
+
         int status = 0;
         ConstElementPtr txt = isc::config::parseAnswer(status, answer);
         // This should succeed. If not, print the error message.
@@ -385,7 +391,7 @@ TEST_F(CtrlChannelDhcpv6SrvTest, set_config) {
         "            \"severity\": \"INFO\", \n"
         "            \"debuglevel\": 0, \n"
         "            \"output_options\": [{ \n"
-        "                \"output\": \"stdout\" \n"
+        "                \"output\": \"/dev/null\" \n"
         "            }] \n"
         "        }] \n"
         "    } \n";
@@ -403,7 +409,8 @@ TEST_F(CtrlChannelDhcpv6SrvTest, set_config) {
         << control_socket_footer
         << "}\n"                      // close dhcp6
         << ","
-        << logger_txt << "}}";
+        << logger_txt
+        << "}}";
 
     // Send the set-config command
     std::string response;
@@ -429,15 +436,14 @@ TEST_F(CtrlChannelDhcpv6SrvTest, set_config) {
         << socket_path_
         << control_socket_footer
         << "}\n"                      // close dhcp6
-        << ","
-        << logger_txt << "}}";
+        "}}";
 
     // Send the set-config command
     sendUnixCommand(os.str(), response);
 
     // Should fail with a syntax error
     EXPECT_EQ("{ \"result\": 1, "
-              "\"text\": \"unsupported parameter: BOGUS (<string>:12:33)\" }",
+              "\"text\": \"unsupported parameter: BOGUS (<string>:12:26)\" }",
               response);
 
     // Check that the config was not lost
@@ -455,8 +461,7 @@ TEST_F(CtrlChannelDhcpv6SrvTest, set_config) {
         << subnet2
         << subnet_footer
         << "}\n"                      // close dhcp6
-        << ","
-        << logger_txt << "}}";
+        << "}}";
 
     // Send the set-config command
     sendUnixCommand(os.str(), response);

src/bin/dhcp6/tests/dhcp6_test_utils.cc

@@ -10,6 +10,7 @@
 #include <dhcp6/tests/dhcp6_test_utils.h>
 #include <dhcp6/json_config_parser.h>
 #include <dhcp/tests/pkt_captures.h>
+#include <log/logger_support.h>
 #include <util/pointer_util.h>
 #include <cc/command_interpreter.h>
 #include <stats/stats_mgr.h>
@@ -46,6 +47,9 @@ BaseServerTest::~BaseServerTest() {
 
     // Revert to original data directory.
     CfgMgr::instance().setDataDir(original_datadir_);
+
+    // Revert to unit test logging
+    isc::log::initLogger();
 }
 
 Dhcpv6SrvTest::Dhcpv6SrvTest()