[core] checkTemplateVersions: Ensure nodes are not loaded several times

By performing a `initNodes()` every single time `checkTemplateVersions`
was called without ever unregistering the nodes, warnings about nodes
being already registered were raised when for example calling
`checkAllTemplatesVersions`.

meshroom/core/test.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # coding:utf-8
 
-from meshroom.core import pipelineTemplates, Version
+from meshroom.core import unregisterNodeType, pipelineTemplates, Version
 from meshroom.core.node import CompatibilityIssue, CompatibilityNode
 from meshroom.core.graphIO import GraphIO
 
@@ -9,60 +9,69 @@ import meshroom
 
 import json
 
-def checkTemplateVersions(path: str) -> bool:
+def checkTemplateVersions(path: str, nodesAlreadyLoaded: bool = False) -> bool:
     """ Check whether there is a compatibility issue with the nodes saved in the template provided with "path". """
-    meshroom.core.initNodes()
+    if not nodesAlreadyLoaded:
+        meshroom.core.initNodes()
 
     with open(path) as jsonFile:
         fileData = json.load(jsonFile)
 
-    graphData = fileData.get(GraphIO.Keys.Graph, fileData)
-    if not isinstance(graphData, dict):
-        return False
-
-    header = fileData.get(GraphIO.Keys.Header, {})
-    if not header.get("template", False):
-        return False
-    nodesVersions = header.get(GraphIO.Keys.NodesVersions, {})
-
-    for _, nodeData in graphData.items():
-        nodeType = nodeData["nodeType"]
-        if not nodeType in meshroom.core.nodesDesc:
+    try:
+        graphData = fileData.get(GraphIO.Keys.Graph, fileData)
+        if not isinstance(graphData, dict):
             return False
 
-        nodeDesc = meshroom.core.nodesDesc[nodeType]
-        currentNodeVersion = meshroom.core.nodeVersion(nodeDesc)
-
-        inputs = nodeData.get("inputs", {})
-        internalInputs = nodeData.get("internalInputs", {})
-        version = nodesVersions.get(nodeType, None)
-
-        compatibilityIssue = None
-
-        if version and currentNodeVersion and Version(version).major != Version(currentNodeVersion).major:
-            compatibilityIssue = CompatibilityIssue.VersionConflict
-        else:
-            for attrName, value in inputs.items():
-                if not CompatibilityNode.attributeDescFromName(nodeDesc.inputs, attrName, value):
-                    compatibilityIssue = CompatibilityIssue.DescriptionConflict
-                    break
-            for attrName, value in internalInputs.items():
-                if not CompatibilityNode.attributeDescFromName(nodeDesc.internalInputs, attrName, value):
-                    compatibilityIssue = CompatibilityIssue.DescriptionConflict
-                    break
-
-        if compatibilityIssue is not None:
-            print("{} in {} for node {}".format(compatibilityIssue, path, nodeType))
+        header = fileData.get(GraphIO.Keys.Header, {})
+        if not header.get("template", False):
             return False
+        nodesVersions = header.get(GraphIO.Keys.NodesVersions, {})
 
-    return True
+        for _, nodeData in graphData.items():
+            nodeType = nodeData["nodeType"]
+            if not nodeType in meshroom.core.nodesDesc:
+                return False
+
+            nodeDesc = meshroom.core.nodesDesc[nodeType]
+            currentNodeVersion = meshroom.core.nodeVersion(nodeDesc)
+
+            inputs = nodeData.get("inputs", {})
+            internalInputs = nodeData.get("internalInputs", {})
+            version = nodesVersions.get(nodeType, None)
+
+            compatibilityIssue = None
+
+            if version and currentNodeVersion and Version(version).major != Version(currentNodeVersion).major:
+                compatibilityIssue = CompatibilityIssue.VersionConflict
+            else:
+                for attrName, value in inputs.items():
+                    if not CompatibilityNode.attributeDescFromName(nodeDesc.inputs, attrName, value):
+                        compatibilityIssue = CompatibilityIssue.DescriptionConflict
+                        break
+                for attrName, value in internalInputs.items():
+                    if not CompatibilityNode.attributeDescFromName(nodeDesc.internalInputs, attrName, value):
+                        compatibilityIssue = CompatibilityIssue.DescriptionConflict
+                        break
+
+            if compatibilityIssue is not None:
+                print("{} in {} for node {}".format(compatibilityIssue, path, nodeType))
+                return False
+
+        return True
+
+    finally:
+        if not nodesAlreadyLoaded:
+            nodeTypes = [nodeType for _, nodeType in meshroom.core.nodesDesc.items()]
+            for nodeType in nodeTypes:
+                unregisterNodeType(nodeType)
 
 
 def checkAllTemplatesVersions() -> bool:
+    meshroom.core.initNodes()
     meshroom.core.initPipelines()
 
     validVersions = []
     for _, path in pipelineTemplates.items():
-        validVersions.append(checkTemplateVersions(path))
+        validVersions.append(checkTemplateVersions(path, nodesAlreadyLoaded=True))
 
     return all(validVersions)