regulators: Implement Configuration execution

Implement the execute() method of the Configuration class.  This method
configures a regulator device/rail by executing actions from the JSON
config file.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: Idb133516f9f425da75079f6c24f5f0d70c6eb0e2
diff --git a/phosphor-regulators/src/configuration.cpp b/phosphor-regulators/src/configuration.cpp
new file mode 100644
index 0000000..99245ca
--- /dev/null
+++ b/phosphor-regulators/src/configuration.cpp
@@ -0,0 +1,77 @@
+/**
+ * Copyright © 2020 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "configuration.hpp"
+
+#include "action_environment.hpp"
+#include "action_utils.hpp"
+#include "chassis.hpp"
+#include "device.hpp"
+#include "exception_utils.hpp"
+#include "journal.hpp"
+#include "rail.hpp"
+#include "system.hpp"
+
+#include <exception>
+
+namespace phosphor::power::regulators
+{
+
+void Configuration::execute(System& system, Chassis& chassis, Device& device)
+{
+    execute(system, chassis, device, device.getID());
+}
+
+void Configuration::execute(System& system, Chassis& chassis, Device& device,
+                            Rail& rail)
+{
+    execute(system, chassis, device, rail.getID());
+}
+
+void Configuration::execute(System& system, Chassis& /*chassis*/,
+                            Device& device, const std::string& deviceOrRailID)
+{
+    try
+    {
+        // Log debug message in journal
+        std::string message{"Configuring " + deviceOrRailID};
+        if (volts.has_value())
+        {
+            message += ": volts=" + std::to_string(volts.value());
+        }
+        journal::logDebug(message);
+
+        // Create ActionEnvironment
+        ActionEnvironment environment{system.getIDMap(), device.getID()};
+        if (volts.has_value())
+        {
+            environment.setVolts(volts.value());
+        }
+
+        // Execute the actions
+        action_utils::execute(actions, environment);
+    }
+    catch (const std::exception& e)
+    {
+        // Log error messages in journal
+        exception_utils::log(e);
+        journal::logErr("Unable to configure " + deviceOrRailID);
+
+        // TODO: Create error log entry
+    }
+}
+
+} // namespace phosphor::power::regulators