/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import groovy.json.JsonOutput

plugins { id 'org.apache.beam.module' }
applyJavaNature(automaticModuleName: 'org.apache.beam.runners.dataflow')

description = "Apache Beam :: Runners :: Google Cloud Dataflow"

/*
 * We need to rely on manually specifying these evaluationDependsOn to ensure that
 * the following projects are evaluated before we evaluate this project. This is because
 * we are attempting to reference parameters such as "sourceSets.test.output" directly.
 */
evaluationDependsOn(":sdks:java:io:google-cloud-platform")
evaluationDependsOn(":sdks:java:core")
evaluationDependsOn(":examples:java")
evaluationDependsOn(":runners:google-cloud-dataflow-java:worker:legacy-worker")
evaluationDependsOn(":runners:google-cloud-dataflow-java:worker")
evaluationDependsOn(":sdks:java:container")

processResources {
  filter org.apache.tools.ant.filters.ReplaceTokens, tokens: [
    'dataflow.legacy_environment_major_version' : '7',
    'dataflow.fnapi_environment_major_version' : '7',
    'dataflow.container_version' : 'beam-master-20200123'
  ]
}

// Exclude tests that need a runner
test {
  systemProperty "beamTestPipelineOptions", ""
  systemProperty "beamUseDummyRunner", "true"
  useJUnit {
    excludeCategories 'org.apache.beam.sdk.testing.ValidatesRunner'
  }
}

configurations {
  validatesRunner
  coreSDKJavaIntegrationTest
  examplesJavaIntegrationTest
  googleCloudPlatformIntegrationTest
}

dependencies {
  compile library.java.vendored_guava_26_0_jre
  compile project(path: ":model:pipeline", configuration: "shadow")
  compile project(path: ":sdks:java:core", configuration: "shadow")
  compile project(":sdks:java:extensions:google-cloud-platform-core")
  compile project(":sdks:java:io:google-cloud-platform")
  compile project(":runners:core-construction-java")
  compile library.java.avro
  compile library.java.bigdataoss_util
  compile library.java.google_api_client
  compile library.java.google_api_services_clouddebugger
  compile library.java.google_api_services_dataflow
  compile library.java.google_api_services_storage
  compile library.java.google_auth_library_credentials
  compile library.java.google_auth_library_oauth2_http
  compile library.java.google_http_client
  compile library.java.google_http_client_jackson2
  compile library.java.jackson_annotations
  compile library.java.jackson_core
  compile library.java.jackson_databind
  compile library.java.joda_time
  compile library.java.slf4j_api
  compile library.java.vendored_grpc_1_26_0
  testCompile library.java.hamcrest_core
  testCompile library.java.guava_testlib
  testCompile library.java.junit
  testCompile project(path: ":sdks:java:io:google-cloud-platform", configuration: "testRuntime")
  testCompile project(path: ":sdks:java:core", configuration: "shadowTest")
  testCompile project(path: ":sdks:java:extensions:google-cloud-platform-core", configuration: "testRuntime")
  testCompile library.java.google_cloud_dataflow_java_proto_library_all
  testCompile library.java.jackson_dataformat_yaml
  testCompile library.java.mockito_core
  testCompile library.java.proto_google_cloud_datastore_v1
  testCompile library.java.slf4j_jdk14
  validatesRunner project(path: ":sdks:java:core", configuration: "shadowTest")
  validatesRunner project(project.path)
  validatesRunner project(path: project.path, configuration: "testRuntime")
  validatesRunner library.java.hamcrest_core
  validatesRunner library.java.hamcrest_library
  coreSDKJavaIntegrationTest project(project.path)
  coreSDKJavaIntegrationTest project(path: ":sdks:java:core", configuration: "shadowTest")
  examplesJavaIntegrationTest project(project.path)
  examplesJavaIntegrationTest project(path: ":examples:java", configuration: "testRuntime")
  googleCloudPlatformIntegrationTest project(project.path)
  googleCloudPlatformIntegrationTest project(path: ":sdks:java:io:google-cloud-platform", configuration: "testRuntime")
}

def dataflowProject = project.findProperty('dataflowProject') ?: 'apache-beam-testing'
def dataflowValidatesTempRoot = project.findProperty('dataflowTempRoot') ?: 'gs://temp-storage-for-validates-runner-tests'
def dataflowPostCommitTempRoot = project.findProperty('dataflowTempRoot') ?: 'gs://temp-storage-for-end-to-end-tests'
def dataflowPostCommitTempRootKms = project.findProperty('dataflowTempRootKms') ?: 'gs://temp-storage-for-end-to-end-tests-cmek'
def dataflowUploadTemp = project.findProperty('dataflowTempRoot') ?: 'gs://temp-storage-for-upload-tests'
def testFilesToStage = project.findProperty('filesToStage') ?: 'test.txt'
def dataflowLegacyWorkerJar = project.findProperty('dataflowWorkerJar') ?: project(":runners:google-cloud-dataflow-java:worker:legacy-worker").shadowJar.archivePath
def dataflowFnApiWorkerJar = project.findProperty('dataflowWorkerJar') ?: project(":runners:google-cloud-dataflow-java:worker").shadowJar.archivePath
def dataflowKmsKey = project.findProperty('dataflowKmsKey') ?: "projects/apache-beam-testing/locations/global/keyRings/beam-it/cryptoKeys/test"

def dockerImageRoot = project.findProperty('dockerImageRoot') ?: "us.gcr.io/${dataflowProject}/java-postcommit-it"
def dockerImageContainer = "${dockerImageRoot}/java"
def dockerTag = new Date().format('yyyyMMddHHmmss')
// If -PuseExecutableStage is set, the use_executable_stage_bundle_execution wil be enabled.
def fnapiExperiments = project.findProperty('useExecutableStage') ? 'beam_fn_api,use_executable_stage_bundle_execution' : "beam_fn_api"
ext.dockerImageName = "${dockerImageContainer}:${dockerTag}"

def fnApiPipelineOptions = [
  "--dataflowWorkerJar=${dataflowFnApiWorkerJar}",
  "--workerHarnessContainerImage=${dockerImageContainer}:${dockerTag}",
  "--experiments=${fnapiExperiments}",
]

def commonExcludeCategories = [
  'org.apache.beam.sdk.testing.LargeKeys$Above10MB',
  'org.apache.beam.sdk.testing.UsesAttemptedMetrics',
  'org.apache.beam.sdk.testing.UsesCrossLanguageTransforms',
  'org.apache.beam.sdk.testing.UsesDistributionMetrics',
  'org.apache.beam.sdk.testing.UsesGaugeMetrics',
  'org.apache.beam.sdk.testing.UsesSetState',
  'org.apache.beam.sdk.testing.UsesMapState',
  'org.apache.beam.sdk.testing.UsesSplittableParDoWithWindowedSideInputs',
  'org.apache.beam.sdk.testing.UsesUnboundedPCollections',
  'org.apache.beam.sdk.testing.UsesTestStream',
  'org.apache.beam.sdk.testing.UsesParDoLifecycle',
  'org.apache.beam.sdk.testing.UsesMetricsPusher',
]

def fnApiWorkerExcludeCategories = [
  'org.apache.beam.sdk.testing.UsesBoundedSplittableParDo',
  'org.apache.beam.sdk.testing.UsesCustomWindowMerging',
  'org.apache.beam.sdk.testing.DataflowPortabilityApiUnsupported',
  'org.apache.beam.sdk.testing.FlattenWithHeterogeneousCoders',
  'org.apache.beam.sdk.testing.UsesUnboundedSplittableParDo',
  'org.apache.beam.sdk.testing.UsesSchema',
]

// For the following test tasks using legacy worker, set workerHarnessContainerImage to empty to
// make Dataflow pick up the non-versioned container image, which handles a staged worker jar.
task validatesRunnerLegacyWorkerTest(type: Test) {
  group = "Verification"
  dependsOn ":runners:google-cloud-dataflow-java:worker:legacy-worker:shadowJar"

  systemProperty "beamTestPipelineOptions", JsonOutput.toJson([
          "--runner=TestDataflowRunner",
          "--project=${dataflowProject}",
          "--tempRoot=${dataflowValidatesTempRoot}",
          "--dataflowWorkerJar=${dataflowLegacyWorkerJar}",
          "--workerHarnessContainerImage=",
  ])

  // Increase test parallelism up to the number of Gradle workers. By default this is equal
  // to the number of CPU cores, but can be increased by setting --max-workers=N.
  maxParallelForks Integer.MAX_VALUE
  classpath = configurations.validatesRunner
  testClassesDirs = files(project(":sdks:java:core").sourceSets.test.output.classesDirs) +
          files(project(project.path).sourceSets.test.output.classesDirs)
  useJUnit {
    includeCategories 'org.apache.beam.sdk.testing.ValidatesRunner'
    commonExcludeCategories.each {
      excludeCategories it
    }
  }
}

task validatesRunnerLegacyWorkerJava11Test(type: Test) {
    group = "Verification"
    dependsOn ":runners:google-cloud-dataflow-java:worker:legacy-worker:shadowJar"
    systemProperty "beamTestPipelineOptions", JsonOutput.toJson([
            "--runner=TestDataflowRunner",
            "--project=${dataflowProject}",
            "--tempRoot=${dataflowValidatesTempRoot}",
            "--dataflowWorkerJar=${dataflowLegacyWorkerJar}",
            "--workerHarnessContainerImage=",
    ])
    
    systemProperty "java.specification.version", "11"

    // Increase test parallelism up to the number of Gradle workers. By default this is equal
    // to the number of CPU cores, but can be increased by setting --max-workers=N.
    maxParallelForks Integer.MAX_VALUE
    classpath = configurations.validatesRunner
  testClassesDirs = files(project(":sdks:java:core").sourceSets.test.output.classesDirs) +
          files(project(project.path).sourceSets.test.output.classesDirs)
    useJUnit {
        includeCategories 'org.apache.beam.sdk.testing.ValidatesRunner'
        commonExcludeCategories.each {
            excludeCategories it
        }
    }
}

// Push docker images to a container registry for use within tests.
// NB: Tasks which consume docker images from the registry should depend on this
// task directly ('dependsOn buildAndPushDockerContainer'). This ensures the correct
// task ordering such that the registry doesn't get cleaned up prior to task completion.
task buildAndPushDockerContainer() {
  dependsOn ":sdks:java:container:docker"
  finalizedBy 'cleanUpDockerImages'
  def defaultDockerImageName = containerImageName(
          name: "java_sdk",
          root: "apachebeam",
          tag: project.sdk_version)
  doLast {
    exec {
      commandLine "docker", "tag", "${defaultDockerImageName}", "${dockerImageName}"
    }
    exec {
      commandLine "gcloud", "docker", "--", "push", "${dockerImageContainer}"
    }
  }
}

afterEvaluate {
  // Ensure all tasks which use published docker images run before they are cleaned up
  tasks.each { t ->
    if (t.dependsOn.contains(buildAndPushDockerContainer)) {
      cleanUpDockerImages.mustRunAfter t
    }
  }
}

task printFnApiPipelineOptions {
  group = "Help"
  description = "Prints to the console extra pipeline options needed to run a Dataflow pipeline using portability"

  dependsOn ":runners:google-cloud-dataflow-java:worker:shadowJar"
  dependsOn buildAndPushDockerContainer

  doLast {
    println "To run a Dataflow job with portability, add the following pipeline options to your command-line:"
    println fnApiPipelineOptions.join(' ')
  }
}

task validatesRunnerFnApiWorkerTest(type: Test) {
  group = "Verification"
  dependsOn ":runners:google-cloud-dataflow-java:worker:shadowJar"
  dependsOn buildAndPushDockerContainer
  systemProperty "beamTestPipelineOptions", JsonOutput.toJson([
          "--runner=TestDataflowRunner",
          "--project=${dataflowProject}",
          "--tempRoot=${dataflowPostCommitTempRoot}"] + fnApiPipelineOptions
  )

  // Increase test parallelism up to the number of Gradle workers. By default this is equal
  // to the number of CPU cores, but can be increased by setting --max-workers=N.
  maxParallelForks Integer.MAX_VALUE
  classpath = configurations.validatesRunner
  testClassesDirs = files(project(":sdks:java:core").sourceSets.test.output.classesDirs) +
          files(project(project.path).sourceSets.test.output.classesDirs)
  useJUnit {
    includeCategories 'org.apache.beam.sdk.testing.ValidatesRunner'
    excludeCategories 'org.apache.beam.sdk.testing.UsesStrictTimerOrdering'
    commonExcludeCategories.each {
      excludeCategories it
    }
    fnApiWorkerExcludeCategories.each {
      excludeCategories it
    }
  }
}

task validatesRunnerFnApiWorkerExecutableStageTest(type: Test) {
  group = "Verification"
  description "Validates Dataflow PortabilityApi runner"
  dependsOn ":runners:google-cloud-dataflow-java:worker:shadowJar"
  dependsOn buildAndPushDockerContainer

  systemProperty "beamTestPipelineOptions", JsonOutput.toJson([
          "--runner=TestDataflowRunner",
          "--project=${dataflowProject}",
          "--tempRoot=${dataflowPostCommitTempRoot}",
          "--dataflowWorkerJar=${dataflowFnApiWorkerJar}",
          "--workerHarnessContainerImage=${dockerImageContainer}:${dockerTag}",
          "--experiments=beam_fn_api,use_executable_stage_bundle_execution"]
  )

  // Increase test parallelism up to the number of Gradle workers. By default this is equal
  // to the number of CPU cores, but can be increased by setting --max-workers=N.
  maxParallelForks Integer.MAX_VALUE
  classpath = configurations.validatesRunner
  testClassesDirs = files(project(":sdks:java:core").sourceSets.test.output.classesDirs) +
          files(project(project.path).sourceSets.test.output.classesDirs)
  useJUnit {
    includeCategories 'org.apache.beam.sdk.testing.ValidatesRunner'
    commonExcludeCategories.each {
      excludeCategories it
    }
    fnApiWorkerExcludeCategories.each {
      excludeCategories it
    }
    // TODO(BEAM-6233): Support timer and state.
    excludeCategories 'org.apache.beam.sdk.testing.UsesStatefulParDo'
  }
}

task validatesRunner {
  group = "Verification"
  description "Validates Dataflow runner"
  dependsOn validatesRunnerLegacyWorkerTest
}

task validatesJava11Runner {
    group = 'Verification'
    description 'Verifies Dataflow runner with Java 11 container harness'
    dependsOn validatesRunnerLegacyWorkerJava11Test
}

task googleCloudPlatformLegacyWorkerIntegrationTest(type: Test) {
  group = "Verification"
  dependsOn ":runners:google-cloud-dataflow-java:worker:legacy-worker:shadowJar"
  systemProperty "beamTestPipelineOptions", JsonOutput.toJson([
          "--runner=TestDataflowRunner",
          "--project=${dataflowProject}",
          "--tempRoot=${dataflowPostCommitTempRoot}",
          "--dataflowWorkerJar=${dataflowLegacyWorkerJar}",
          "--workerHarnessContainerImage=",
  ])

  include '**/*IT.class'
  exclude '**/BigQueryIOReadIT.class'
  exclude '**/BigQueryIOStorageReadTableRowIT.class'
  exclude '**/PubsubReadIT.class'
  maxParallelForks 4
  classpath = configurations.googleCloudPlatformIntegrationTest
  testClassesDirs = files(project(":sdks:java:io:google-cloud-platform").sourceSets.test.output.classesDirs)
  useJUnit {
    excludeCategories "org.apache.beam.sdk.testing.UsesKms"
  }
}

task googleCloudPlatformLegacyWorkerKmsIntegrationTest(type: Test) {
  group = "Verification"
  dependsOn ":runners:google-cloud-dataflow-java:worker:legacy-worker:shadowJar"
  systemProperty "beamTestPipelineOptions", JsonOutput.toJson([
          "--runner=TestDataflowRunner",
          "--project=${dataflowProject}",
          "--tempRoot=${dataflowPostCommitTempRootKms}",
          "--dataflowWorkerJar=${dataflowLegacyWorkerJar}",
          "--workerHarnessContainerImage=",
          "--dataflowKmsKey=${dataflowKmsKey}",
  ])

  include '**/*IT.class'
  exclude '**/BigQueryKmsKeyIT.class'  // Only needs to run on direct runner.
  maxParallelForks 4
  classpath = configurations.googleCloudPlatformIntegrationTest
  testClassesDirs = files(project(":sdks:java:io:google-cloud-platform").sourceSets.test.output.classesDirs)
  useJUnit {
    includeCategories "org.apache.beam.sdk.testing.UsesKms"
  }
}

task googleCloudPlatformFnApiWorkerIntegrationTest(type: Test) {
  group = "Verification"
  dependsOn ":runners:google-cloud-dataflow-java:worker:shadowJar"
  dependsOn buildAndPushDockerContainer

  systemProperty "beamTestPipelineOptions", JsonOutput.toJson([
          "--runner=TestDataflowRunner",
          "--project=${dataflowProject}",
          "--tempRoot=${dataflowPostCommitTempRoot}"] + fnApiPipelineOptions
  )

  include '**/*IT.class'
  exclude '**/BigQueryIOReadIT.class'
  exclude '**/BigQueryIOStorageQueryIT.class'
  exclude '**/BigQueryIOStorageReadIT.class'
  exclude '**/BigQueryIOStorageReadTableRowIT.class'
  exclude '**/PubsubReadIT.class'
  exclude '**/SpannerReadIT.class'
  exclude '**/BigtableReadIT.class'
  exclude '**/V1ReadIT.class'
  exclude '**/SpannerWriteIT.class'
  exclude '**/BigQueryNestedRecordsIT.class'
  exclude '**/SplitQueryFnIT.class'
  exclude '**/*KmsKeyIT.class'

  maxParallelForks 4
  classpath = configurations.googleCloudPlatformIntegrationTest
  testClassesDirs = files(project(":sdks:java:io:google-cloud-platform").sourceSets.test.output.classesDirs)
  useJUnit {
    excludeCategories 'org.apache.beam.sdk.testing.DataflowPortabilityApiUnsupported'
  }
}

task examplesJavaLegacyWorkerIntegrationTest(type: Test) {
  group = "Verification"
  dependsOn ":runners:google-cloud-dataflow-java:worker:legacy-worker:shadowJar"

  systemProperty "beamTestPipelineOptions", JsonOutput.toJson([
          "--runner=TestDataflowRunner",
          "--project=${dataflowProject}",
          "--tempRoot=${dataflowPostCommitTempRoot}",
          "--dataflowWorkerJar=${dataflowLegacyWorkerJar}",
          "--workerHarnessContainerImage=",
  ])

  // The examples/java preCommit task already covers running WordCountIT/WindowedWordCountIT so
  // this postCommit integration test excludes them.
  include '**/*IT.class'
  exclude '**/WordCountIT.class'
  exclude '**/WindowedWordCountIT.class'
  maxParallelForks 4
  classpath = configurations.examplesJavaIntegrationTest
  testClassesDirs = files(project(":examples:java").sourceSets.test.output.classesDirs)
  useJUnit { }
}

// For fn-api runner, only run the IT can be passed for now.
// Should support more ITs in the future.
task examplesJavaFnApiWorkerIntegrationTest(type: Test) {
  group = "Verification"
  dependsOn ":runners:google-cloud-dataflow-java:worker:shadowJar"
  dependsOn buildAndPushDockerContainer

  systemProperty "beamTestPipelineOptions", JsonOutput.toJson([
          "--runner=TestDataflowRunner",
          "--project=${dataflowProject}",
          "--tempRoot=${dataflowPostCommitTempRoot}"] + fnApiPipelineOptions
  )

  // The examples/java preCommit task already covers running WordCountIT/WindowedWordCountIT so
  // this postCommit integration test excludes them.
  include '**/*IT.class'
  exclude '**/WordCountIT.class'
  exclude '**/WindowedWordCountIT.class'
  exclude '**/TopWikipediaSessionsIT.class'
  exclude '**/TfIdfIT.class'
  exclude '**/AutoCompleteIT.class'
  exclude '**/TrafficMaxLaneFlowIT.class'
  exclude '**/TrafficRoutesIT.class'

  maxParallelForks 4
  classpath = configurations.examplesJavaIntegrationTest
  testClassesDirs = files(project(":examples:java").sourceSets.test.output.classesDirs)
  useJUnit { }
}

task coreSDKJavaLegacyWorkerIntegrationTest(type: Test) {
  group = "Verification"
  dependsOn ":runners:google-cloud-dataflow-java:worker:legacy-worker:shadowJar"

  systemProperty "beamTestPipelineOptions", JsonOutput.toJson([
          "--runner=TestDataflowRunner",
          "--project=${dataflowProject}",
          "--tempRoot=${dataflowPostCommitTempRoot}",
          "--dataflowWorkerJar=${dataflowLegacyWorkerJar}",
          "--workerHarnessContainerImage=",
  ])

  include '**/*IT.class'
  // TODO[Beam-4684]: Support @RequiresStableInput on Dataflow in a more intelligent way
  exclude '**/RequiresStableInputIT.class'
  maxParallelForks 4
  classpath = configurations.coreSDKJavaIntegrationTest
  testClassesDirs = files(project(":sdks:java:core").sourceSets.test.output.classesDirs)
  useJUnit { }
}

task coreSDKJavaFnApiWorkerIntegrationTest(type: Test) {
  group = "Verification"
  dependsOn ":runners:google-cloud-dataflow-java:worker:shadowJar"
  dependsOn buildAndPushDockerContainer

  systemProperty "beamTestPipelineOptions", JsonOutput.toJson([
          "--runner=TestDataflowRunner",
          "--project=${dataflowProject}",
          "--tempRoot=${dataflowPostCommitTempRoot}"] + fnApiPipelineOptions
  )

  include '**/*IT.class'
  // TODO[Beam-4684]: Support @RequiresStableInput on Dataflow in a more intelligent way
  exclude '**/RequiresStableInputIT.class'
  maxParallelForks 4
  classpath = configurations.coreSDKJavaIntegrationTest
  testClassesDirs = files(project(":sdks:java:core").sourceSets.test.output.classesDirs)
  useJUnit { }
}

task postCommit {
  group = "Verification"
  description = "Various integration tests using the Dataflow runner."
  dependsOn googleCloudPlatformLegacyWorkerIntegrationTest
  dependsOn googleCloudPlatformLegacyWorkerKmsIntegrationTest
  dependsOn examplesJavaLegacyWorkerIntegrationTest
  dependsOn coreSDKJavaLegacyWorkerIntegrationTest
}

task postCommitPortabilityApi {
  group = "Verification"
  description = "Various integration tests using the Dataflow FnApi runner."
  dependsOn buildAndPushDockerContainer
  dependsOn googleCloudPlatformFnApiWorkerIntegrationTest
  dependsOn examplesJavaFnApiWorkerIntegrationTest
  dependsOn coreSDKJavaFnApiWorkerIntegrationTest
}

// Clean up built images
task cleanUpDockerImages() {
  doLast {
    exec {
      commandLine "docker", "rmi", "${dockerImageName}"
    }
    exec {
      commandLine "gcloud", "--quiet", "container", "images", "delete", "--force-delete-tags", "${dockerImageName}"
    }
  }
}

def gcpProject = project.findProperty('gcpProject') ?: 'apache-beam-testing'
def gcsBucket = project.findProperty('gcsBucket') ?: 'temp-storage-for-release-validation-tests/nightly-snapshot-validation'
def bqDataset = project.findProperty('bqDataset') ?: 'beam_postrelease_mobile_gaming'
def pubsubTopic = project.findProperty('pubsubTopic') ?: 'java_mobile_gaming_topic'

// Generates :runners:google-cloud-dataflow-java:runQuickstartJavaDataflow
createJavaExamplesArchetypeValidationTask(type: 'Quickstart',
  runner: 'Dataflow',
  gcpProject: gcpProject,
  gcsBucket: gcsBucket)

// Generates :runners:google-cloud-dataflow-java:runMobileGamingJavaDataflow
createJavaExamplesArchetypeValidationTask(type: 'MobileGaming',
  runner: 'Dataflow',
  gcpProject: gcpProject,
  gcsBucket: gcsBucket,
  bqDataset: bqDataset,
  pubsubTopic: pubsubTopic)

// Standalone task for testing GCS upload, use with -PfilesToStage and -PdataflowTempRoot.
task GCSUpload(type: JavaExec) {
  main = 'org.apache.beam.runners.dataflow.util.GCSUploadMain'
  classpath = sourceSets.test.runtimeClasspath
  args "--stagingLocation=${dataflowUploadTemp}/staging",
       "--filesToStage=${testFilesToStage}"
}