Returning null for unresolved variables

When Blueprints Processor was not able to evaluate a variable, it would
set its value to null.

The expected behaviour would be to set the value to the default repres-
entation in the formal notation as defined by Apache Velocity, which is
a dollar followed by the name of the variable between curly braces. For
example, if the value of the variable pnf-id could not be evaluated in
runtime, its value would be defined as the string "${pnf-id}".

The problem happened during evaluation of the variables that would be
later sent to the template-meshing code for processing.

The fix was to add a check before the value was assigned to the varia-
ble; if the was not null, the assignment will happen normally. Otherwi-
se, if the evaluation resolves to null, the variable receives the defa-
ult value (string "${<variable name>}").

Besides the tests that were put in place to test the code changed for
this fix, two tests were added to the existing test case of the templa-
te meshing code, to act as regression test.

Change-Id: I635afb1eba4c0d45b821811f0119fa6c87ea9542
Issue-ID: CCSDK-1358
Signed-off-by: ottero <rodrigo.ottero@est.tech>

2 files changed, 90 insertions, 1 deletions

diff --git a/ms/blueprintsprocessor/functions/resource-resolution/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/functions/resource/resolution/utils/ResourceAssignmentUtils.kt b/ms/blueprintsprocessor/functions/resource-resolution/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/functions/resource/resolution/utils/ResourceAssignmentUtils.kt
index 656e86169..1a943d110 100644
--- a/ms/blueprintsprocessor/functions/resource-resolution/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/functions/resource/resolution/utils/ResourceAssignmentUtils.kt
+++ b/ms/blueprintsprocessor/functions/resource-resolution/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/functions/resource/resolution/utils/ResourceAssignmentUtils.kt
@@ -21,6 +21,7 @@ import com.fasterxml.jackson.databind.JsonNode
 import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.databind.node.NullNode
 import com.fasterxml.jackson.databind.node.ObjectNode
+import com.fasterxml.jackson.databind.node.TextNode
 import org.onap.ccsdk.cds.blueprintsprocessor.functions.resource.resolution.ResourceAssignmentRuntimeService
 import org.onap.ccsdk.cds.blueprintsprocessor.functions.resource.resolution.ResourceResolutionConstants
 import org.onap.ccsdk.cds.controllerblueprints.core.*
@@ -122,7 +123,7 @@ class ResourceAssignmentUtils {
                     if (isNotEmpty(it.name) && it.property != null) {
                         val rName = it.name
                         val type = nullToEmpty(it.property?.type).toLowerCase()
-                        val value = it.property?.value
+                        val value = useDefaultValueIfNull(it, rName)
                         logger.info("Generating Resource name ($rName), type ($type), value ($value)")
                         root.set(rName, value)
                     }
@@ -136,6 +137,15 @@ class ResourceAssignmentUtils {
             return result
         }
 
+        private fun useDefaultValueIfNull(resourceAssignment: ResourceAssignment, resourceAssignmentName: String): JsonNode {
+            if (resourceAssignment.property?.value == null) {
+                val defaultValue = "\${$resourceAssignmentName}"
+                return TextNode(defaultValue)
+            } else {
+                return resourceAssignment.property!!.value!!
+            }
+        }
+
         fun transformToRARuntimeService(blueprintRuntimeService: BluePrintRuntimeService<*>,
                                         templateArtifactName: String): ResourceAssignmentRuntimeService {
 
diff --git a/ms/blueprintsprocessor/functions/resource-resolution/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/functions/resource/resolution/utils/ResourceAssignmentUtilsTest.kt b/ms/blueprintsprocessor/functions/resource-resolution/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/functions/resource/resolution/utils/ResourceAssignmentUtilsTest.kt
new file mode 100644
index 000000000..9b87c12eb
--- /dev/null
+++ b/ms/blueprintsprocessor/functions/resource-resolution/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/functions/resource/resolution/utils/ResourceAssignmentUtilsTest.kt
@@ -0,0 +1,79 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+
+package org.onap.ccsdk.cds.blueprintsprocessor.functions.resource.resolution.utils
+
+import com.fasterxml.jackson.databind.node.TextNode
+import org.junit.Test
+import org.onap.ccsdk.cds.controllerblueprints.core.data.PropertyDefinition
+import org.onap.ccsdk.cds.controllerblueprints.resource.dict.ResourceAssignment
+import kotlin.test.assertEquals
+
+class ResourceAssignmentUtilsTest {
+
+    @Test
+    fun `generateResourceDataForAssignments - positive test`() {
+        //given a valid resource assignment
+        val validResourceAssignment = createResourceAssignmentForTest("valid_value")
+
+        //and a list containing that resource assignment
+        val resourceAssignmentList = listOf<ResourceAssignment>(validResourceAssignment)
+
+        //when the values of the resources are evaluated
+        val outcome = ResourceAssignmentUtils.generateResourceDataForAssignments(resourceAssignmentList)
+
+        //then the assignment should produce a valid result
+        val expected = "{\n" + "  \"pnf-id\" : \"valid_value\"\n" + "}"
+        assertEquals(expected, outcome, "unexpected outcome generated")
+
+    }
+
+    @Test
+    fun `generateResourceDataForAssignments - resource without value is not resolved as null`() {
+        //given a valid resource assignment
+        val resourceAssignmentWithNullValue = createResourceAssignmentForTest(null)
+
+        //and a list containing that resource assignment
+        val resourceAssignmentList = listOf<ResourceAssignment>(resourceAssignmentWithNullValue)
+
+        //when the values of the resources are evaluated
+        val outcome = ResourceAssignmentUtils.generateResourceDataForAssignments(resourceAssignmentList)
+
+        //then the assignment should produce a valid result
+        val expected = "{\n" + "  \"pnf-id\" : \"\${pnf-id}\"\n" + "}"
+        assertEquals(expected, outcome, "unexpected outcome generated")
+
+    }
+
+    private fun createResourceAssignmentForTest(resourceValue: String?): ResourceAssignment {
+        val valueForTest = if (resourceValue == null) null else TextNode(resourceValue)
+        val resourceAssignmentForTest = ResourceAssignment().apply {
+            name = "pnf-id"
+            dictionaryName = "pnf-id"
+            dictionarySource = "input"
+            property = PropertyDefinition().apply {
+                type = "string"
+                value = valueForTest
+            }
+        }
+        return resourceAssignmentForTest
+    }
+}
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