[Common] Adjust CCDB loading to capture Run 2 GRPObject for MagField (#13384)

Co-authored-by: ALICE Builder <alibuild@users.noreply.github.com>

Author: ddobrigk

Common/TableProducer/propagationServiceRun2.cxx

@@ -91,6 +91,7 @@ struct propagationServiceRun2 {
     ccdb->setCaching(true);
     ccdb->setLocalObjectValidityChecking();
     ccdb->setURL(ccdburl.value);
+    ccdb->setFatalWhenNull(false);
 
     // task-specific
     strangenessBuilderModule.init(baseOpts, v0BuilderOpts, cascadeBuilderOpts, preSelectOpts, histos, initContext);

Common/Tools/StandardCCDBLoader.h

@@ -18,6 +18,7 @@
 
 #include <DataFormatsCalibration/MeanVertexObject.h>
 #include <DataFormatsParameters/GRPMagField.h>
+#include <DataFormatsParameters/GRPObject.h>
 #include <DetectorsBase/MatLayerCylSet.h>
 #include <DetectorsBase/Propagator.h>
 #include <Framework/Configurable.h>
@@ -43,6 +44,7 @@ struct StandardCCDBLoaderConfigurables : o2::framework::ConfigurableGroup {
   o2::framework::Configurable<std::string> ccdburl{"ccdb-url", "http://alice-ccdb.cern.ch", "url of the ccdb repository"};
   o2::framework::Configurable<std::string> lutPath{"lutPath", "GLO/Param/MatLUT", "Path of the Lut parametrization"};
   o2::framework::Configurable<std::string> grpmagPath{"grpmagPath", "GLO/Config/GRPMagField", "CCDB path of the GRPMagField object"};
+  o2::framework::Configurable<std::string> grpPath{"grpPath", "GLO/GRP/GRP", "Path of the grp file"};
   o2::framework::Configurable<std::string> mVtxPath{"mVtxPath", "GLO/Calib/MeanVertex", "Path of the mean vertex file"};
 };
 
@@ -81,25 +83,36 @@ class StandardCCDBLoader
       return;
     }
 
+    grpmag = ccdb->template getForRun<o2::parameters::GRPMagField>(cGroup.grpmagPath.value, currentRunNumber);
+    if (grpmag) {
+      LOG(info) << "Setting global propagator magnetic field to current " << grpmag->getL3Current() << " A for run " << currentRunNumber << " from its GRPMagField CCDB object";
+      o2::base::Propagator::initFieldFromGRP(grpmag);
+    } else {
+      LOGF(info, "GRPMagField object returned nullptr, will attempt alternate method");
+
+      o2::parameters::GRPObject* grpo = 0x0;
+      grpo = ccdb->template getForRun<o2::parameters::GRPObject>(cGroup.grpPath.value, currentRunNumber);
+      if (!grpo) {
+        LOG(fatal) << "Alternate path failed! Got nullptr from CCDB for path " << cGroup.grpPath << " of object GRPObject for run " << currentRunNumber;
+      }
+      o2::base::Propagator::initFieldFromGRP(grpo);
+    }
+    if (getMeanVertex) {
+      // only try this if explicitly requested
+      mMeanVtx = ccdb->template getForRun<o2::dataformats::MeanVertexObject>(cGroup.mVtxPath.value, currentRunNumber);
+    } else {
+      mMeanVtx = nullptr;
+    }
+
     // load matLUT for this timestamp
     if (!lut) {
       LOG(info) << "Loading material look-up table for timestamp: " << currentRunNumber;
       lut = o2::base::MatLayerCylSet::rectifyPtrFromFile(ccdb->template getForRun<o2::base::MatLayerCylSet>(cGroup.lutPath.value, currentRunNumber));
     } else {
       LOG(info) << "Material look-up table already in place. Not reloading.";
     }
-
-    grpmag = ccdb->template getForRun<o2::parameters::GRPMagField>(cGroup.grpmagPath.value, currentRunNumber);
-    LOG(info) << "Setting global propagator magnetic field to current " << grpmag->getL3Current() << " A for run " << currentRunNumber << " from its GRPMagField CCDB object";
-    o2::base::Propagator::initFieldFromGRP(grpmag);
     LOG(info) << "Setting global propagator material propagation LUT";
     o2::base::Propagator::Instance()->setMatLUT(lut);
-    if (getMeanVertex) {
-      // only try this if explicitly requested
-      mMeanVtx = ccdb->template getForRun<o2::dataformats::MeanVertexObject>(cGroup.mVtxPath.value, currentRunNumber);
-    } else {
-      mMeanVtx = nullptr;
-    }
 
     runNumber = currentRunNumber;
   }