Add support for POST on TriggersCollection

Added POST method on /redfish/v1/TelemetryService/Triggers uri, which
creates new trigger in telemetry service, by using dbus call AddTrigger.

By DMTF, most of the properties are not required, and as such are
treated as optional. Some values can be deduced from others (like
'MetricType', depending on 'DiscreteTriggers' or 'NumericThresholds').
All properties provided in POST body by user will be verified against
each other, and errors will be raised. Few examples of such situations:
- 'MetricType' is set to 'Discrete' but 'NumericThresholds' was passed.
- 'MetricType' is set to 'Numeric' but "DiscreteTriggers' or
  'DiscreteTriggerCondition' were passed
- 'DiscreteTriggerCondition' is set to 'Specified' but
  'DiscreteTriggers' is an empty array or was not passed.
- 'DiscreteTriggerCondition' is set to 'Changed' but 'DiscreteTriggers'
  is passed and is not an empty array.

Example 1 – Trigger with discrete values:
```
{
    "Id": "TestTrigger",
    "MetricType": "Discrete",
    "TriggerActions": [
        "RedfishEvent"
    ],
    "DiscreteTriggerCondition": "Specified",
    "DiscreteTriggers": [
        {
            "Value": "55.88",
            "DwellTime": "PT0.001S",
            "Severity": "Warning"
        },
        {
            "Name": "My discrete trigger",
            "Value": "55.88",
            "DwellTime": "PT0.001S",
            "Severity": "OK"
        },
        {
            "Value": "55.88",
            "DwellTime": "PT0.001S",
            "Severity": "Critical"
        }
    ],
    "MetricProperties": [
        "/redfish/v1/Chassis/AC_Baseboard/Thermal#/Fans/0/Reading"
    ],
    "Links": {
        "MetricReportDefinitions": []
    }
}

Example 2 – trigger with numeric threshold:
{
    "Id": "TestTrigger2",
    "Name": "My Numeric Trigger",
    "MetricType": "Numeric",
    "TriggerActions": [
        "RedfishEvent",
        "RedfishMetricReport"
    ],
    "NumericThresholds": {
        "UpperCritical": {
            "Reading": 50,
            "Activation": "Increasing",
            "DwellTime": "PT0.001S"
        },
        "UpperWarning": {
            "Reading": 48.1,
            "Activation": "Increasing",
            "DwellTime": "PT0.004S"
        }
    },
    "MetricProperties": [
        "/redfish/v1/Chassis/AC_Baseboard/Thermal#/Fans/0/Reading",
        "/redfish/v1/Chassis/AC_Baseboard/Thermal#/Fans/17/Reading"
    ],
    "Links": {
        "MetricReportDefinitions": [
            "/redfish/v1/TelemetryService/MetricReportDefinitions/PowerMetrics",
            "/redfish/v1/TelemetryService/MetricReportDefinitions/PowerMetricStats",
            "/redfish/v1/TelemetryService/MetricReportDefinitions/PlatformPowerUsage"
        ]
    }
}
```

Tested:
- Triggers were successfully created with above example message bodies.
  This can be checked by calling:
  'busctl tree xyz.openbmc_project.Telemetry'.
- Expected errors were returned for messages with incorrect or mutually
  exclusive properties and incorrect values.
- Redfish service validator is passing.

Signed-off-by: Szymon Dompke <szymon.dompke@intel.com>
Change-Id: Ief8c76de8aa660ae0d2dbe4610c26a28186a290a

1 files changed, 19 insertions, 0 deletions

diff --git a/redfish-core/include/utils/telemetry_utils.hpp b/redfish-core/include/utils/telemetry_utils.hpp
index fc045f6742..58ab1c9d28 100644
--- a/redfish-core/include/utils/telemetry_utils.hpp
+++ b/redfish-core/include/utils/telemetry_utils.hpp
@@ -34,6 +34,25 @@ inline std::string getDbusTriggerPath(const std::string& id)
     return {triggersPath / id};
 }
 
+inline std::optional<std::string>
+    getTriggerIdFromDbusPath(const std::string& dbusPath)
+{
+    sdbusplus::message::object_path converted(dbusPath);
+
+    if (converted.parent_path() !=
+        "/xyz/openbmc_project/Telemetry/Triggers/TelemetryService")
+    {
+        return std::nullopt;
+    }
+
+    const std::string& id = converted.filename();
+    if (id.empty())
+    {
+        return std::nullopt;
+    }
+    return id;
+}
+
 struct IncorrectMetricUri
 {
     std::string uri;