log node/edge/property count when loading proto CPGs (#1815)

* add log of count of graph elements during proto conversion

flatgraph now logs this info internally while loading a
graph. ODB graphs are converted on the fly to flatgraph, so that'll
happen for those graphs as well. Add this for protos, and all formats
are covered.

* update flatgraph

Author: maltek

build.sbt

@@ -1,7 +1,7 @@
 name := "codepropertygraph"
 
 // parsed by project/Versions.scala, updated by updateDependencies.sh
-val flatgraphVersion = "0.1.9"
+val flatgraphVersion = "0.1.12"
 
 inThisBuild(
   List(

codepropertygraph/src/main/scala/io/shiftleft/codepropertygraph/cpgloading/ProtoCpgLoader.scala

@@ -41,6 +41,8 @@ object ProtoCpgLoader {
     implicit val interner: StringInterner = StringInterner.makeStrongInterner()
     val protoToGraphNodeMappings          = new ProtoToGraphNodeMappings
     val cpg                               = openOrCreateCpg(storagePath)
+    var edgeCount                         = 0
+    var propCount                         = 0
 
     // first pass: add the raw nodes without any properties or edges
     addNodesRaw(protoCpgs().flatMap(cpgProto => nodesIter(cpgProto)), cpg.graph, protoToGraphNodeMappings)
@@ -54,20 +56,23 @@ object ProtoCpgLoader {
           .findGNode(protoNode)
           .getOrElse(throw new ConversionException(s"node with proto node id=$protoNodeId not found in graph"))
         protoNode.getPropertyList.iterator().asScala.foreach { protoProperty =>
+          propCount += 1
           diffGraph.setNodeProperty(gNode, protoProperty.getName.name(), extractPropertyValue(protoProperty.getValue()))
         }
       }
 
       protoCpg.getEdgeList.iterator().asScala.foreach { protoEdge =>
         List(protoEdge.getSrc, protoEdge.getDst).map(protoToGraphNodeMappings.findGNode) match {
           case List(Some(srcNode), Some(dstNode)) =>
+            edgeCount += 1
             diffGraph.addEdge(srcNode, dstNode, protoEdge.getType.name(), extractEdgePropertyValue(protoEdge))
           case _ => // at least one of the nodes doesn't exist in the cpg, most likely because it was filtered out - ignore
         }
       }
     }
 
     DiffGraphApplier.applyDiff(cpg.graph, diffGraph)
+    logger.debug(s"Loaded proto graph with ${cpg.graph.nodeCount} nodes, $edgeCount edges, $propCount properties")
     cpg
   }