control: Parse optional "manager.json"
Parse the optional "manager.json" configuration file which currently
provides a single optional attribute "power_on_delay". When the
"power_on_delay" attribute is not present, it is defaulted to 0.
An example "manager.json" file:
```
{
"power_on_delay": 20
}
```
Tested:
Power on delay of 0 when no "manager.json" file present
Power on delay of 0 when no "power_on_delay" JSON attribute present
Power on delay set to value given in "power_on_delay"
Change-Id: I5506ad4e853bdea249b9a794ce335261fdfcaa9f
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/control/json/manager.cpp b/control/json/manager.cpp
new file mode 100644
index 0000000..0ec0d0d
--- /dev/null
+++ b/control/json/manager.cpp
@@ -0,0 +1,52 @@
+/**
+ * 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 "manager.hpp"
+
+#include "json_config.hpp"
+#include "json_parser.hpp"
+
+#include <sdbusplus/bus.hpp>
+
+#include <filesystem>
+
+namespace phosphor::fan::control::json
+{
+
+Manager::Manager(sdbusplus::bus::bus& bus)
+{
+ // Manager JSON config file is optional
+ auto confFile =
+ fan::JsonConfig::getConfFile(bus, confAppName, confFileName, true);
+ if (!confFile.empty())
+ {
+ _jsonObj = fan::JsonConfig::load(confFile);
+ }
+}
+
+unsigned int Manager::getPowerOnDelay()
+{
+ auto powerOnDelay = 0;
+
+ // Parse optional "power_on_delay" from JSON object
+ if (!_jsonObj.empty() && _jsonObj.contains("power_on_delay"))
+ {
+ powerOnDelay = _jsonObj["power_on_delay"].get<unsigned int>();
+ }
+
+ return powerOnDelay;
+}
+
+} // namespace phosphor::fan::control::json