Add blueprint Kotlin script support.

Change-Id: I92b8e9850ea07c7f671e7aada9770713854534c3
Issue-ID: CCSDK-941
Signed-off-by: Muthuramalingam, Brinda Santh <bs2796@att.com>

4 files changed, 274 insertions, 0 deletions

diff --git a/components/core/src/main/kotlin/org/onap/ccsdk/apps/controllerblueprints/core/script/BluePrintScriptConfiguration.kt b/components/core/src/main/kotlin/org/onap/ccsdk/apps/controllerblueprints/core/script/BluePrintScriptConfiguration.kt
new file mode 100644
index 00000000..f7bfb857
--- /dev/null
+++ b/components/core/src/main/kotlin/org/onap/ccsdk/apps/controllerblueprints/core/script/BluePrintScriptConfiguration.kt
@@ -0,0 +1,86 @@
+/*
+ * Copyright © 2017-2018 AT&T Intellectual Property.
+ *
+ * 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.
+ */
+
+package org.onap.ccsdk.apps.controllerblueprints.core.script
+
+import org.jetbrains.kotlin.script.util.LocalFilesResolver
+import java.io.File
+import kotlin.script.dependencies.ScriptContents
+import kotlin.script.dependencies.ScriptDependenciesResolver
+import kotlin.script.experimental.annotations.KotlinScript
+import kotlin.script.experimental.api.*
+import kotlin.script.experimental.jvm.JvmDependency
+import kotlin.script.experimental.jvm.dependenciesFromCurrentContext
+import kotlin.script.experimental.jvm.jvm
+
+
+@KotlinScript(fileExtension = "kts",
+        compilationConfiguration = ComponentScriptConfiguration::class)
+abstract class ComponentScript {
+
+}
+
+object ComponentScriptConfiguration : ScriptCompilationConfiguration(
+        {
+           // defaultImports(DependsOn::class, Repository::class)
+            jvm {
+                dependenciesFromCurrentContext(
+                        wholeClasspath = true
+                )
+            }
+//            refineConfiguration {
+//                onAnnotations(DependsOn::class, Repository::class, handler = ::configureLocalFileDepsOnAnnotations)
+//            }
+        }
+)
+
+
+private val resolver = LocalFilesResolver()
+
+fun configureLocalFileDepsOnAnnotations(context: ScriptConfigurationRefinementContext):
+        ResultWithDiagnostics<ScriptCompilationConfiguration> {
+
+    val annotations = context.collectedData?.get(ScriptCollectedData.foundAnnotations)?.takeIf { it.isNotEmpty() }
+            ?: return context.compilationConfiguration.asSuccess()
+
+    val scriptContents = object : ScriptContents {
+        override val annotations: Iterable<Annotation> = annotations
+        override val file: File? = null
+        override val text: CharSequence? = null
+    }
+
+    val diagnostics = arrayListOf<ScriptDiagnostic>()
+
+    fun report(severity: ScriptDependenciesResolver.ReportSeverity, message: String, position: ScriptContents.Position?) {
+        //TODO
+    }
+
+    return try {
+        val newDepsFromResolver = resolver.resolve(scriptContents, emptyMap(), ::report, null).get()
+                ?: return context.compilationConfiguration.asSuccess(diagnostics)
+
+        val resolvedClasspath = newDepsFromResolver.classpath.toList().takeIf { it.isNotEmpty() }
+                ?: return context.compilationConfiguration.asSuccess(diagnostics)
+
+        ScriptCompilationConfiguration(context.compilationConfiguration) {
+            dependencies.append(JvmDependency(resolvedClasspath))
+
+        }.asSuccess(diagnostics)
+
+    } catch (e: Throwable) {
+        ResultWithDiagnostics.Failure(*diagnostics.toTypedArray(), e.asDiagnostics())
+    }
+}
\ No newline at end of file
diff --git a/components/core/src/main/kotlin/org/onap/ccsdk/apps/controllerblueprints/core/script/BluePrintScriptService.kt b/components/core/src/main/kotlin/org/onap/ccsdk/apps/controllerblueprints/core/script/BluePrintScriptService.kt
new file mode 100644
index 00000000..8ae09151
--- /dev/null
+++ b/components/core/src/main/kotlin/org/onap/ccsdk/apps/controllerblueprints/core/script/BluePrintScriptService.kt
@@ -0,0 +1,78 @@
+/*
+ * Copyright © 2017-2018 AT&T Intellectual Property.
+ *
+ * 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.
+ */
+
+package org.onap.ccsdk.apps.controllerblueprints.core.script
+
+import org.onap.ccsdk.apps.controllerblueprints.core.BluePrintProcessorException
+import java.io.File
+import java.io.InputStream
+import java.io.Reader
+import javax.script.ScriptEngineManager
+import kotlin.script.experimental.api.ResultValue
+import kotlin.script.experimental.api.ResultWithDiagnostics
+import kotlin.script.experimental.api.resultOrNull
+import kotlin.script.experimental.host.toScriptSource
+import kotlin.script.experimental.jvmhost.createJvmCompilationConfigurationFromTemplate
+
+
+open class BluePrintScriptService(classLoader: ClassLoader? = Thread.currentThread().contextClassLoader) {
+
+    /**
+     * Get the Script Class instance
+     */
+    inline fun <reified T> scriptClassNewInstance(scriptFile: File, scriptClassName: String): T {
+
+        val compilationConfiguration = createJvmCompilationConfigurationFromTemplate<ComponentScript>()
+
+        val scriptEvaluator = BluePrintScriptEvaluator(scriptClassName)
+
+        val evalResponse = BlueprintScriptingHost(scriptEvaluator).eval(scriptFile.toScriptSource(), compilationConfiguration,
+                null)
+
+        when (evalResponse) {
+            is ResultWithDiagnostics.Success -> {
+                val returnValue = evalResponse.resultOrNull()?.returnValue as ResultValue.Value
+                return returnValue.value.castOrError()
+            }
+            is ResultWithDiagnostics.Failure -> {
+                throw BluePrintProcessorException(evalResponse.reports.joinToString("\n"))
+            }
+            else -> {
+                throw BluePrintProcessorException("Failed to process script ${scriptFile.absolutePath}")
+            }
+        }
+
+    }
+
+    val engine = ScriptEngineManager(classLoader).getEngineByExtension("kts")
+
+    inline fun <R> safeEval(evaluation: () -> R?) = try {
+        evaluation()
+    } catch (e: Exception) {
+        throw BluePrintProcessorException("Cannot load script", e)
+    }
+
+    inline fun <reified T> Any?.castOrError() = takeIf { it is T }?.let { it as T }
+            ?: throw IllegalArgumentException("Cannot cast $this to expected type ${T::class}")
+
+    inline fun <reified T> load(script: String): T = safeEval { engine.eval(script) }.castOrError()
+
+    inline fun <reified T> load(reader: Reader): T = safeEval { engine.eval(reader) }.castOrError()
+
+    inline fun <reified T> load(inputStream: InputStream): T = load(inputStream.reader())
+
+    inline fun <reified T> loadAll(vararg inputStream: InputStream): List<T> = inputStream.map(::load)
+}
diff --git a/components/core/src/main/kotlin/org/onap/ccsdk/apps/controllerblueprints/core/script/BlueprintScriptingHost.kt b/components/core/src/main/kotlin/org/onap/ccsdk/apps/controllerblueprints/core/script/BlueprintScriptingHost.kt
new file mode 100644
index 00000000..bda20a44
--- /dev/null
+++ b/components/core/src/main/kotlin/org/onap/ccsdk/apps/controllerblueprints/core/script/BlueprintScriptingHost.kt
@@ -0,0 +1,93 @@
+/*
+ * Copyright © 2017-2018 AT&T Intellectual Property.
+ *
+ * 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.
+ */
+
+package org.onap.ccsdk.apps.controllerblueprints.core.script
+
+import org.onap.ccsdk.apps.controllerblueprints.core.BluePrintProcessorException
+import org.slf4j.LoggerFactory
+import kotlin.script.experimental.api.*
+import kotlin.script.experimental.host.BasicScriptingHost
+import kotlin.script.experimental.jvm.defaultJvmScriptingHostConfiguration
+import kotlin.script.experimental.jvmhost.JvmScriptCompiler
+
+val defaultBlueprintScriptCompiler = JvmScriptCompiler(defaultJvmScriptingHostConfiguration)
+
+open class BlueprintScriptingHost(evaluator: ScriptEvaluator
+) : BasicScriptingHost(defaultBlueprintScriptCompiler, evaluator) {
+
+    override fun eval(
+            script: SourceCode,
+            scriptCompilationConfiguration: ScriptCompilationConfiguration,
+            configuration: ScriptEvaluationConfiguration?
+    ): ResultWithDiagnostics<EvaluationResult> =
+
+            runInCoroutineContext {
+
+                compiler(script, scriptCompilationConfiguration)
+                        .onSuccess {
+                            evaluator(it, configuration)
+                        }
+            }
+}
+
+
+open class BluePrintScriptEvaluator(private val scriptClassName: String) : ScriptEvaluator {
+
+    val log = LoggerFactory.getLogger(BluePrintScriptEvaluator::class.java)!!
+
+    override suspend operator fun invoke(
+            compiledScript: CompiledScript<*>,
+            scriptEvaluationConfiguration: ScriptEvaluationConfiguration?
+    ): ResultWithDiagnostics<EvaluationResult> =
+            try {
+                val res = compiledScript.getClass(scriptEvaluationConfiguration)
+                when (res) {
+                    is ResultWithDiagnostics.Failure -> res
+                    is ResultWithDiagnostics.Success -> {
+                        val scriptClass = res.value
+                        val args = ArrayList<Any?>()
+                        scriptEvaluationConfiguration?.get(ScriptEvaluationConfiguration.providedProperties)?.forEach {
+                            args.add(it.value)
+                        }
+                        scriptEvaluationConfiguration?.get(ScriptEvaluationConfiguration.implicitReceivers)?.let {
+                            args.addAll(it)
+                        }
+                        scriptEvaluationConfiguration?.get(ScriptEvaluationConfiguration.constructorArgs)?.let {
+                            args.addAll(it)
+                        }
+
+                        val completeScriptClass = "Script\$$scriptClassName"
+                        log.info("Searching for class type($completeScriptClass)")
+                        /**
+                         * Search for Class Name
+                         */
+                        val instanceClass = scriptClass.java.classes
+                                .single { it.name == completeScriptClass }
+                                //.single { it.name == "Script\$SampleBlueprintsFunctionNode" }
+
+
+                        val instance = instanceClass.newInstance()
+                                ?: throw BluePrintProcessorException("failed to create instance from the script")
+
+                        ResultWithDiagnostics.Success(EvaluationResult(ResultValue.Value(completeScriptClass,
+                                instance, instance.javaClass.typeName),
+                                scriptEvaluationConfiguration))
+                    }
+                }
+            } catch (e: Throwable) {
+                ResultWithDiagnostics.Failure(e.asDiagnostics("Error evaluating script"))
+            }
+}
\ No newline at end of file
diff --git a/components/core/src/main/resources/META-INF/services/javax.script.ScriptEngineFactory b/components/core/src/main/resources/META-INF/services/javax.script.ScriptEngineFactory
new file mode 100644
index 00000000..89838f44
--- /dev/null
+++ b/components/core/src/main/resources/META-INF/services/javax.script.ScriptEngineFactory
@@ -0,0 +1,17 @@
+#
+# Copyright © 2017-2018 AT&T Intellectual Property.
+#
+# 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.
+#
+
+org.jetbrains.kotlin.script.jsr223.KotlinJsr223JvmLocalScriptEngineFactory
\ No newline at end of file