ms/controllerblueprints/modules/blueprint-core/src/main/kotlin/org/onap/ccsdk/cds/controllerblueprints/core/scripts/BluePrintScriptingHost.kt

   1 /*
   2  * Copyright © 2017-2018 AT&T Intellectual Property.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.onap.ccsdk.cds.controllerblueprints.core.scripts
  18
  19 import org.onap.ccsdk.cds.controllerblueprints.core.BluePrintProcessorException
  20 import org.slf4j.LoggerFactory
  21 import java.util.*
  22 import kotlin.reflect.full.createInstance
  23 import kotlin.script.experimental.api.*
  24 import kotlin.script.experimental.host.BasicScriptingHost
  25 import kotlin.script.experimental.jvm.defaultJvmScriptingHostConfiguration
  26 import kotlin.script.experimental.jvmhost.JvmScriptCompiler
  27 import kotlin.script.experimental.jvmhost.impl.withDefaults
  28
  29 val blueprintScriptCompiler = JvmScriptCompiler(defaultJvmScriptingHostConfiguration,
  30         BluePrintsCompilerProxy(defaultJvmScriptingHostConfiguration.withDefaults()))
  31
  32 open class BlueprintScriptingHost(evaluator: ScriptEvaluator) : BasicScriptingHost(blueprintScriptCompiler, evaluator) {
  33
  34     override fun eval(script: SourceCode, compilationConfiguration: ScriptCompilationConfiguration,
  35                       evaluationConfiguration: ScriptEvaluationConfiguration?): ResultWithDiagnostics<EvaluationResult> =
  36
  37             runInCoroutineContext {
  38                 blueprintScriptCompiler(script, compilationConfiguration)
  39                         .onSuccess { compiledScript ->
  40                             evaluator(compiledScript, evaluationConfiguration ?: ScriptEvaluationConfiguration.Default)
  41                         }.onFailure { failedResult ->
  42                             val messages = failedResult.reports.joinToString("\n")
  43                             throw BluePrintProcessorException(messages)
  44                         }
  45             }
  46 }
  47
  48 open class BluePrintScriptEvaluator(private val scriptClassName: String) : ScriptEvaluator {
  49
  50     private val log = LoggerFactory.getLogger(BluePrintScriptEvaluator::class.java)!!
  51
  52     override suspend operator fun invoke(compiledScript: CompiledScript<*>,
  53                                          scriptEvaluationConfiguration: ScriptEvaluationConfiguration
  54     ): ResultWithDiagnostics<EvaluationResult> =
  55             try {
  56                 log.debug("Getting script class name($scriptClassName) from the compiled sources ")
  57
  58                 val bluePrintCompiledScript = compiledScript as BluePrintCompiledScript
  59                 bluePrintCompiledScript.scriptClassFQName = scriptClassName
  60
  61                 when (val classResult = compiledScript.getClass(scriptEvaluationConfiguration)) {
  62                     is ResultWithDiagnostics.Failure -> classResult
  63                     is ResultWithDiagnostics.Success -> {
  64
  65                         val scriptClass = classResult.value
  66                         val args = ArrayList<Any?>()
  67                         scriptEvaluationConfiguration.get(ScriptEvaluationConfiguration.providedProperties)?.forEach {
  68                             args.add(it.value)
  69                         }
  70                         scriptEvaluationConfiguration.get(ScriptEvaluationConfiguration.implicitReceivers)?.let {
  71                             args.addAll(it)
  72                         }
  73                         scriptEvaluationConfiguration.get(ScriptEvaluationConfiguration.constructorArgs)?.let {
  74                             args.addAll(it)
  75                         }
  76
  77                         val instance = if (args.isNotEmpty()) {
  78                             scriptClass.java.constructors.single().newInstance(*args.toArray())
  79                                     ?: throw BluePrintProcessorException("failed to create instance from the script")
  80                         } else {
  81                             scriptClass.createInstance()
  82                         }
  83
  84                         log.debug("Created script instance of type ${instance.javaClass}")
  85
  86                         ResultWithDiagnostics.Success(EvaluationResult(ResultValue.Value(scriptClass.qualifiedName!!,
  87                                 instance, "", instance),
  88                                 scriptEvaluationConfiguration))
  89                     }
  90                 }
  91             } catch (e: Throwable) {
  92                 ResultWithDiagnostics.Failure(e.asDiagnostics("Error evaluating script"))
  93             }
  94 }