Add xDS k8s url-map Kokoro job (#8340)

Related PR grpc/grpc#26764
Related CL cl/386366746

This test suite will be run every 6 hours, and takes around 30 minutes. The script is copied from xds-k8s.sh, and removed the generation of server image.

buildscripts/kokoro/xds_url_map.cfg

@@ -0,0 +1,13 @@
+# Config file for internal CI
+
+# Location of the continuous shell script in repository.
+build_file: "grpc-java/buildscripts/kokoro/xds-url-map.sh"
+timeout_mins: 60
+
+action {
+  define_artifacts {
+    regex: "artifacts/**/*sponge_log.xml"
+    regex: "artifacts/**/*sponge_log.log"
+    strip_prefix: "artifacts"
+  }
+}

buildscripts/kokoro/xds_url_map.sh

@@ -0,0 +1,153 @@
+#!/usr/bin/env bash
+set -eo pipefail
+
+# Constants
+readonly GITHUB_REPOSITORY_NAME="grpc-java"
+# GKE Cluster
+readonly GKE_CLUSTER_NAME="interop-test-psm-sec-v2-us-central1-a"
+readonly GKE_CLUSTER_ZONE="us-central1-a"
+## xDS test client Docker images
+readonly CLIENT_IMAGE_NAME="gcr.io/grpc-testing/xds-interop/java-client"
+readonly FORCE_IMAGE_BUILD="${FORCE_IMAGE_BUILD:-0}"
+readonly BUILD_APP_PATH="interop-testing/build/install/grpc-interop-testing"
+
+#######################################
+# Builds the test app using gradle and smoke-checks its binaries
+# Globals:
+#   SRC_DIR
+#   BUILD_APP_PATH
+# Arguments:
+#   None
+# Outputs:
+#   Writes the output of xds-test-client --help to stderr
+#######################################
+build_java_test_app() {
+  echo "Building Java test app"
+  cd "${SRC_DIR}"
+  ./gradlew --no-daemon grpc-interop-testing:installDist -x test \
+    -PskipCodegen=true -PskipAndroid=true --console=plain
+
+  # Test-run binaries
+  run_ignore_exit_code "${SRC_DIR}/${BUILD_APP_PATH}/bin/xds-test-client" --help
+}
+
+#######################################
+# Builds test app Docker images and pushes them to GCR
+# Globals:
+#   BUILD_APP_PATH
+#   CLIENT_IMAGE_NAME: Test client Docker image name
+#   GIT_COMMIT: SHA-1 of git commit being built
+# Arguments:
+#   None
+# Outputs:
+#   Writes the output of `gcloud builds submit` to stdout, stderr
+#######################################
+build_test_app_docker_images() {
+  echo "Building Java xDS interop test app Docker images"
+  local docker_dir="${SRC_DIR}/buildscripts/xds-k8s"
+  local build_dir
+  build_dir="$(mktemp -d)"
+  # Copy Docker files, log properties, and the test app to the build dir
+  cp -v "${docker_dir}/"*.Dockerfile "${build_dir}"
+  cp -v "${docker_dir}/"*.properties "${build_dir}"
+  cp -rv "${SRC_DIR}/${BUILD_APP_PATH}" "${build_dir}"
+  # Run Google Cloud Build
+  gcloud builds submit "${build_dir}" \
+    --config "${docker_dir}/cloudbuild.yaml" \
+    --substitutions "_CLIENT_IMAGE_NAME=${CLIENT_IMAGE_NAME},COMMIT_SHA=${GIT_COMMIT}"
+  # TODO(sergiitk): extra "cosmetic" tags for versioned branches, e.g. v1.34.x
+  # TODO(sergiitk): do this when adding support for custom configs per version
+}
+
+#######################################
+# Builds test app and its docker images unless they already exist
+# Globals:
+#   CLIENT_IMAGE_NAME: Test client Docker image name
+#   GIT_COMMIT: SHA-1 of git commit being built
+#   FORCE_IMAGE_BUILD
+# Arguments:
+#   None
+# Outputs:
+#   Writes the output to stdout, stderr
+#######################################
+build_docker_images_if_needed() {
+  # Check if images already exist
+  client_tags="$(gcloud_gcr_list_image_tags "${CLIENT_IMAGE_NAME}" "${GIT_COMMIT}")"
+  printf "Client image: %s:%s\n" "${CLIENT_IMAGE_NAME}" "${GIT_COMMIT}"
+  echo "${client_tags:-Client image not found}"
+
+  # Build if any of the images are missing, or FORCE_IMAGE_BUILD=1
+  if [[ "${FORCE_IMAGE_BUILD}" == "1" || -z "${client_tags}" ]]; then
+    build_java_test_app
+    build_test_app_docker_images
+  else
+    echo "Skipping Java test app build"
+  fi
+}
+
+#######################################
+# Executes the test case
+# Globals:
+#   TEST_DRIVER_FLAGFILE: Relative path to test driver flagfile
+#   KUBE_CONTEXT: The name of kubectl context with GKE cluster access
+#   TEST_XML_OUTPUT_DIR: Output directory for the test xUnit XML report
+#   CLIENT_IMAGE_NAME: Test client Docker image name
+#   GIT_COMMIT: SHA-1 of git commit being built
+# Arguments:
+#   Test case name
+# Outputs:
+#   Writes the output of test execution to stdout, stderr
+#   Test xUnit report to ${TEST_XML_OUTPUT_DIR}/${test_name}/sponge_log.xml
+#######################################
+run_test() {
+  # Test driver usage:
+  # https://github.com/grpc/grpc/tree/master/tools/run_tests/xds_k8s_test_driver#basic-usage
+  local test_name="${1:?Usage: run_test test_name}"
+  set -x
+  python -m "tests.${test_name}" \
+    --flagfile="${TEST_DRIVER_FLAGFILE}" \
+    --kube_context="${KUBE_CONTEXT}" \
+    --client_image="${CLIENT_IMAGE_NAME}:${GIT_COMMIT}" \
+    --xml_output_file="${TEST_XML_OUTPUT_DIR}/${test_name}/sponge_log.xml" \
+    --flagfile="config/url-map.cfg"
+  set +x
+}
+
+#######################################
+# Main function: provision software necessary to execute tests, and run them
+# Globals:
+#   KOKORO_ARTIFACTS_DIR
+#   GITHUB_REPOSITORY_NAME
+#   SRC_DIR: Populated with absolute path to the source repo
+#   TEST_DRIVER_REPO_DIR: Populated with the path to the repo containing
+#                         the test driver
+#   TEST_DRIVER_FULL_DIR: Populated with the path to the test driver source code
+#   TEST_DRIVER_FLAGFILE: Populated with relative path to test driver flagfile
+#   TEST_XML_OUTPUT_DIR: Populated with the path to test xUnit XML report
+#   GIT_ORIGIN_URL: Populated with the origin URL of git repo used for the build
+#   GIT_COMMIT: Populated with the SHA-1 of git commit being built
+#   GIT_COMMIT_SHORT: Populated with the short SHA-1 of git commit being built
+#   KUBE_CONTEXT: Populated with name of kubectl context with GKE cluster access
+# Arguments:
+#   None
+# Outputs:
+#   Writes the output of test execution to stdout, stderr
+#######################################
+main() {
+  local script_dir
+  script_dir="$(dirname "$0")"
+  # shellcheck source=buildscripts/kokoro/xds-k8s-install-test-driver.sh
+  source "${script_dir}/xds-k8s-install-test-driver.sh"
+  set -x
+  if [[ -n "${KOKORO_ARTIFACTS_DIR}" ]]; then
+    kokoro_setup_test_driver "${GITHUB_REPOSITORY_NAME}"
+  else
+    local_setup_test_driver "${script_dir}"
+  fi
+  build_docker_images_if_needed
+  # Run tests
+  cd "${TEST_DRIVER_FULL_DIR}"
+  run_test url_map
+}
+
+main "$@"