Test Database Stack (#737)

Reviewed-on: cerc-io/stack-orchestrator#737

.gitea/workflows/test-database-yml

@@ -0,0 +1,52 @@
+name: Database Test
+
+on:
+  push:
+    branches: '*'
+    paths:
+      - '!**'
+      - '.gitea/workflows/triggers/test-database'
+      - '.gitea/workflows/test-database.yml'
+      - 'tests/database/run-test.sh'
+  schedule: # Note: coordinate with other tests to not overload runners at the same time of day
+    - cron: '5 18 * * *'
+
+jobs:
+  test:
+    name: "Run database hosting test on kind/k8s"
+    runs-on: ubuntu-22.04
+    steps:
+      - name: "Clone project repository"
+        uses: actions/checkout@v3
+      # At present the stock setup-python action fails on Linux/aarch64
+      # Conditional steps below workaroud this by using deadsnakes for that case only
+      - name: "Install Python for ARM on Linux"
+        if: ${{ runner.arch == 'arm64' && runner.os == 'Linux' }}
+        uses: deadsnakes/action@v3.0.1
+        with:
+          python-version: '3.8'
+      - name: "Install Python cases other than ARM on Linux"
+        if: ${{ ! (runner.arch == 'arm64' && runner.os == 'Linux') }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.8'
+      - name: "Print Python version"
+        run: python3 --version
+      - name: "Install shiv"
+        run: pip install shiv
+      - name: "Generate build version file"
+        run: ./scripts/create_build_tag_file.sh
+      - name: "Build local shiv package"
+        run: ./scripts/build_shiv_package.sh
+      - name: "Check cgroups version"
+        run: mount | grep cgroup
+      - name: "Install kind"
+        run: ./tests/scripts/install-kind.sh
+      - name: "Install Kubectl"
+        run: ./tests/scripts/install-kubectl.sh
+      - name: "Run database deployment test"
+        run: |
+          source /opt/bash-utils/cgroup-helper.sh
+          join_cgroup
+          ./tests/database/run-test.sh
+

.gitea/workflows/triggers/test-database

@@ -0,0 +1 @@
+Change this file to trigger running the test-database CI job

stack_orchestrator/data/compose/docker-compose-test-database.yml

@@ -0,0 +1,20 @@
+services:
+
+  database:
+    image: cerc/test-database-container:local
+    restart: always
+    volumes:
+      - db-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_USER: "test-user"
+      POSTGRES_DB: "test-db"
+      POSTGRES_PASSWORD: "password"
+      POSTGRES_INITDB_ARGS: "-E UTF8 --locale=C"
+    ports:
+      - "5432"
+    
+  test-client:
+    image: cerc/test-database-client:local
+
+volumes:
+  db-data:

stack_orchestrator/data/container-build/cerc-test-database-client/Dockerfile

@@ -0,0 +1,12 @@
+FROM ubuntu:latest
+
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive && export DEBCONF_NOWARNINGS="yes" && \
+    apt-get install -y software-properties-common && \
+    apt-get install -y postgresql-client && \
+    apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+EXPOSE 80
+
+COPY run.sh /app/run.sh
+
+ENTRYPOINT ["/app/run.sh"]

stack_orchestrator/data/container-build/cerc-test-database-client/build.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+# Build cerc/test-container
+source ${CERC_CONTAINER_BASE_DIR}/build-base.sh
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+docker build -t cerc/test-database-client:local -f ${SCRIPT_DIR}/Dockerfile ${build_command_args} $SCRIPT_DIR

stack_orchestrator/data/container-build/cerc-test-database-client/run.sh

@@ -0,0 +1,71 @@
+#!/usr/bin/env bash
+set -e
+if [ -n "$CERC_SCRIPT_DEBUG" ]; then
+  set -x
+fi
+
+# TODO derive this from config
+database_url="postgresql://test-user:password@localhost:5432/test-db"
+psql_command="psql ${database_url}"
+program_name="Database test client:"
+
+wait_for_database_up () {
+    for i in {1..50}
+    do
+        ${psql_command} -c "select 1;"
+        psql_succeeded=$?
+        if [[ ${psql_succeeded} == 0 ]]; then
+            # if ready, return
+            echo "${program_name} database up"
+            return
+        else
+            # if not ready, wait
+            echo "${program_name} waiting for database: ${i}"
+            sleep 5
+        fi
+    done
+    # Timed out, error exit
+    echo "${program_name} waiting for database: FAILED"
+    exit 1
+}
+
+# Used to synchronize with the test runner
+notify_test_complete () {
+    echo "${program_name} test complete"
+}
+
+does_test_data_exist () {
+    query_result=$(${psql_command} -t -c "select count(*) from test_table_1 where key_column = 'test_key_1';" | head -1 | tr -d ' ')
+    if [[ "${query_result}" == "1" ]]; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+create_test_data () {
+    ${psql_command} -c "create table test_table_1 (key_column text, value_column text, primary key(key_column));"
+    ${psql_command} -c "insert into test_table_1 values ('test_key_1', 'test_value_1');"
+}
+
+wait_forever() {
+    # Loop to keep docker/k8s happy since this is the container entrypoint
+    while :; do sleep 600; done
+}
+
+wait_for_database_up
+
+# Check if the test database content exists already
+if does_test_data_exist; then
+    # If so, log saying so. Test harness will look for this log output
+    echo "${program_name} test data already exists"
+else
+    # Otherwise log saying the content was not present
+    echo "${program_name} test data does not exist"
+    echo "${program_name} creating test data"
+    # then create it
+    create_test_data
+fi
+
+notify_test_complete
+wait_forever

stack_orchestrator/data/container-build/cerc-test-database-container/Dockerfile

@@ -0,0 +1,3 @@
+FROM postgres:16-bullseye
+
+EXPOSE 5432

stack_orchestrator/data/container-build/cerc-test-database-container/build.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+# Build cerc/test-container
+source ${CERC_CONTAINER_BASE_DIR}/build-base.sh
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+docker build -t cerc/test-database-container:local -f ${SCRIPT_DIR}/Dockerfile ${build_command_args} $SCRIPT_DIR

stack_orchestrator/data/stacks/test-database/README.md

@@ -0,0 +1,3 @@
+# Test Database Stack
+
+A stack with a database for test/demo purposes.

stack_orchestrator/data/stacks/test-database/stack.yml

@@ -0,0 +1,9 @@
+version: "1.0"
+name: test
+description: "A test database stack"
+repos:
+containers:
+  - cerc/test-database-container
+  - cerc/test-database-client
+pods:
+  - test-database

stack_orchestrator/deploy/k8s/deploy_k8s.py

@@ -20,7 +20,8 @@ from kubernetes import client, config
 from stack_orchestrator import constants
 from stack_orchestrator.deploy.deployer import Deployer, DeployerConfigGenerator
 from stack_orchestrator.deploy.k8s.helpers import create_cluster, destroy_cluster, load_images_into_kind
-from stack_orchestrator.deploy.k8s.helpers import pods_in_deployment, log_stream_from_string, generate_kind_config
+from stack_orchestrator.deploy.k8s.helpers import pods_in_deployment, containers_in_pod, log_stream_from_string
+from stack_orchestrator.deploy.k8s.helpers import generate_kind_config
 from stack_orchestrator.deploy.k8s.cluster_info import ClusterInfo
 from stack_orchestrator.opts import opts
 from stack_orchestrator.deploy.deployment_context import DeploymentContext
@@ -382,9 +383,15 @@ class K8sDeployer(Deployer):
             log_data = "******* Pods not running ********\n"
         else:
             k8s_pod_name = pods[0]
+            containers = containers_in_pod(self.core_api, k8s_pod_name)
             # If the pod is not yet started, the logs request below will throw an exception
             try:
-                log_data = self.core_api.read_namespaced_pod_log(k8s_pod_name, namespace="default", container="test")
+                log_data = ""
+                for container in containers:
+                    container_log = self.core_api.read_namespaced_pod_log(k8s_pod_name, namespace="default", container=container)
+                    container_log_lines = container_log.splitlines()
+                    for line in container_log_lines:
+                        log_data += f"{container}: {line}\n"
             except client.exceptions.ApiException as e:
                 if opts.o.debug:
                     print(f"Error from read_namespaced_pod_log: {e}")

stack_orchestrator/deploy/k8s/helpers.py

@@ -62,6 +62,17 @@ def pods_in_deployment(core_api: client.CoreV1Api, deployment_name: str):
     return pods
 
 
+def containers_in_pod(core_api: client.CoreV1Api, pod_name: str):
+    containers = []
+    pod_response = core_api.read_namespaced_pod(pod_name, namespace="default")
+    if opts.o.debug:
+        print(f"pod_response: {pod_response}")
+    pod_containers = pod_response.spec.containers
+    for pod_container in pod_containers:
+        containers.append(pod_container.name)
+    return containers
+
+
 def log_stream_from_string(s: str):
     # Note response has to be UTF-8 encoded because the caller expects to decode it
     yield ("ignore", s.encode())

stack_orchestrator/repos/setup_repositories.py

@@ -26,7 +26,7 @@ import importlib.resources
 from pathlib import Path
 import yaml
 from stack_orchestrator.constants import stack_file_name
-from stack_orchestrator.util import include_exclude_check, stack_is_external, error_exit
+from stack_orchestrator.util import include_exclude_check, stack_is_external, error_exit, warn_exit
 
 
 class GitProgress(git.RemoteProgress):
@@ -249,8 +249,8 @@ def command(ctx, include, exclude, git_ssh, check_only, pull, branches, branches
             error_exit(f"stack {stack} does not exist")
         with stack_file_path:
             stack_config = yaml.safe_load(open(stack_file_path, "r"))
-            if "repos" not in stack_config:
-                error_exit(f"stack {stack} does not define any repositories")
+            if "repos" not in stack_config or stack_config["repos"] is None:
+                warn_exit(f"stack {stack} does not define any repositories")
             else:
                 repos_in_scope = stack_config["repos"]
     else:

stack_orchestrator/util.py

@@ -189,5 +189,10 @@ def error_exit(s):
     sys.exit(1)
 
 
+def warn_exit(s):
+    print(f"WARN: {s}")
+    sys.exit(0)
+
+
 def env_var_map_from_file(file: Path) -> Mapping[str, str]:
     return dotenv_values(file)

tests/database/run-test.sh

@@ -0,0 +1,128 @@
+#!/usr/bin/env bash
+set -e
+if [ -n "$CERC_SCRIPT_DEBUG" ]; then
+    set -x
+    # Dump environment variables for debugging
+    echo "Environment variables:"
+    env
+fi
+
+if [ "$1" == "from-path" ]; then
+    TEST_TARGET_SO="laconic-so"
+else
+    TEST_TARGET_SO=$( ls -t1 ./package/laconic-so* | head -1 )
+fi
+
+stack="test-database"
+spec_file=${stack}-spec.yml
+deployment_dir=${stack}-deployment
+
+# Helper functions: TODO move into a separate file
+wait_for_pods_started () {
+    for i in {1..50}
+    do
+        local ps_output=$( $TEST_TARGET_SO deployment --dir $test_deployment_dir ps )
+
+        if [[ "$ps_output" == *"Running containers:"* ]]; then
+            # if ready, return
+            return
+        else
+            # if not ready, wait
+            sleep 5
+        fi
+    done
+    # Timed out, error exit
+    echo "waiting for pods to start: FAILED"
+    delete_cluster_exit
+}
+
+wait_for_test_complete () {
+    for i in {1..50}
+    do
+
+        local log_output=$( $TEST_TARGET_SO deployment --dir $test_deployment_dir logs )
+
+    if [[ "${log_output}" == *"Database test client: test complete"* ]]; then
+            # if ready, return
+            return
+        else
+            # if not ready, wait
+            sleep 5
+        fi
+    done
+    # Timed out, error exit
+    echo "waiting for test complete: FAILED"
+    delete_cluster_exit
+}
+
+
+delete_cluster_exit () {
+    $TEST_TARGET_SO deployment --dir $test_deployment_dir stop --delete-volumes
+    exit 1
+}
+
+# Set a non-default repo dir
+export CERC_REPO_BASE_DIR=~/stack-orchestrator-test/repo-base-dir
+echo "Testing this package: $TEST_TARGET_SO"
+echo "Test version command"
+reported_version_string=$( $TEST_TARGET_SO version )
+echo "Version reported is: ${reported_version_string}"
+echo "Cloning repositories into: $CERC_REPO_BASE_DIR"
+rm -rf $CERC_REPO_BASE_DIR
+mkdir -p $CERC_REPO_BASE_DIR
+$TEST_TARGET_SO --stack ${stack} setup-repositories
+$TEST_TARGET_SO --stack ${stack} build-containers
+# Test basic stack-orchestrator deploy to k8s
+test_deployment_dir=$CERC_REPO_BASE_DIR/test-${deployment_dir}
+test_deployment_spec=$CERC_REPO_BASE_DIR/test-${spec_file}
+
+$TEST_TARGET_SO --stack ${stack} deploy --deploy-to k8s-kind init --output $test_deployment_spec
+# Check the file now exists
+if [ ! -f "$test_deployment_spec" ]; then
+    echo "deploy init test: spec file not present"
+    echo "deploy init test: FAILED"
+    exit 1
+fi
+echo "deploy init test: passed"
+
+$TEST_TARGET_SO --stack ${stack} deploy create --spec-file $test_deployment_spec --deployment-dir $test_deployment_dir
+# Check the deployment dir exists
+if [ ! -d "$test_deployment_dir" ]; then
+    echo "deploy create test: deployment directory not present"
+    echo "deploy create test: FAILED"
+    exit 1
+fi
+echo "deploy create test: passed"
+
+# Try to start the deployment
+$TEST_TARGET_SO deployment --dir $test_deployment_dir start
+wait_for_pods_started
+# Check logs command works
+wait_for_test_complete
+log_output_1=$( $TEST_TARGET_SO deployment --dir $test_deployment_dir logs )
+if [[ "$log_output_1" == *"Database test client: test data does not exist"* ]]; then
+    echo "Create database content test: passed"
+else
+    echo "Create database content test: FAILED"
+    delete_cluster_exit
+fi
+
+# Stop then start again and check the volume was preserved
+$TEST_TARGET_SO deployment --dir $test_deployment_dir stop
+# Sleep a bit just in case
+sleep 20
+$TEST_TARGET_SO deployment --dir $test_deployment_dir start
+wait_for_pods_started
+wait_for_test_complete
+
+log_output_2=$( $TEST_TARGET_SO deployment --dir $test_deployment_dir logs )
+if [[ "$log_output_2" == *"Database test client: test data already exists"* ]]; then
+    echo "Retain database content test: passed"
+else
+    echo "Retain database content test: FAILED"
+    delete_cluster_exit
+fi
+
+# Stop and clean up
+$TEST_TARGET_SO deployment --dir $test_deployment_dir stop --delete-volumes
+echo "Test passed"