Initial commit: demo Flask app + tests + Dockerfile + Jenkinsfile

.gitignore

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+__pycache__/
+*.pyc
+.pytest_cache/
+venv/

Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /srv
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app/ ./app/
+
+ARG APP_VERSION=dev
+ENV APP_VERSION=${APP_VERSION}
+
+RUN useradd -r -u 1001 appuser
+USER appuser
+
+EXPOSE 8000
+HEALTHCHECK --interval=30s --timeout=3s CMD python -c "import urllib.request;urllib.request.urlopen('http://127.0.0.1:8000/health')"
+
+CMD ["gunicorn", "--bind", "0.0.0.0:8000", "--workers", "2", "app.main:app"]

Jenkinsfile

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+pipeline {
+    agent any
+
+    environment {
+        REGISTRY   = '51.195.4.170:5000'
+        IMAGE_NAME = 'swim/demo-app'
+        IMAGE_TAG  = "${env.BUILD_NUMBER}"
+    }
+
+    options {
+        timestamps()
+        buildDiscarder(logRotator(numToKeepStr: '20'))
+        timeout(time: 20, unit: 'MINUTES')
+    }
+
+    stages {
+        stage('Checkout') {
+            steps {
+                checkout scm
+                sh 'echo "commit: $(git rev-parse --short HEAD)"'
+            }
+        }
+
+        stage('Test') {
+            steps {
+                sh '''
+                    docker run --rm -v "$PWD":/src -w /src python:3.12-slim sh -c "
+                        pip install --quiet -r requirements-dev.txt &&
+                        python -m pytest tests/ -v
+                    "
+                '''
+            }
+        }
+
+        stage('Build image') {
+            steps {
+                sh '''
+                    docker build \
+                      --build-arg APP_VERSION=${IMAGE_TAG} \
+                      -t ${REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG} \
+                      -t ${REGISTRY}/${IMAGE_NAME}:latest .
+                    docker images ${REGISTRY}/${IMAGE_NAME}
+                '''
+            }
+        }
+
+        stage('Smoke test image') {
+            steps {
+                sh '''
+                    CID=$(docker run -d -P ${REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG})
+                    sleep 5
+                    docker exec $CID python -c "
+import urllib.request, json, sys
+r = json.loads(urllib.request.urlopen('http://127.0.0.1:8000/version').read())
+print('version endpoint:', r)
+assert r['version'] == '${IMAGE_TAG}', 'version galat!'
+"
+                    docker rm -f $CID
+                '''
+            }
+        }
+
+        stage('Push to registry') {
+            steps {
+                withCredentials([usernamePassword(credentialsId: 'registry-creds',
+                                                  usernameVariable: 'REG_USER',
+                                                  passwordVariable: 'REG_PASS')]) {
+                    sh '''
+                        echo "$REG_PASS" | docker login ${REGISTRY} -u "$REG_USER" --password-stdin
+                        docker push ${REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG}
+                        docker push ${REGISTRY}/${IMAGE_NAME}:latest
+                        docker logout ${REGISTRY}
+                    '''
+                }
+            }
+        }
+    }
+
+    post {
+        always {
+            sh 'docker image prune -f --filter "until=24h" || true'
+            cleanWs()
+        }
+        success { echo "BUILD ${env.BUILD_NUMBER} SAFAL -> ${env.REGISTRY}/${env.IMAGE_NAME}:${env.IMAGE_TAG}" }
+        failure { echo "BUILD ${env.BUILD_NUMBER} FAIL" }
+    }
+}

app/main.py

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+import os
+from flask import Flask, jsonify
+
+app = Flask(__name__)
+VERSION = os.getenv("APP_VERSION", "dev")
+
+@app.route("/health")
+def health():
+    return jsonify(status="ok"), 200
+
+@app.route("/version")
+def version():
+    return jsonify(version=VERSION, app="swim-demo"), 200
+
+@app.route("/")
+def index():
+    return jsonify(message="SWIM DevOps demo app", version=VERSION), 200
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=8000)

requirements-dev.txt

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+-r requirements.txt
+pytest==8.3.3

requirements.txt

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+flask==3.0.3
+gunicorn==22.0.0

tests/test_main.py

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+import sys, os
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
+from app.main import app
+
+def test_health():
+    c = app.test_client()
+    r = c.get("/health")
+    assert r.status_code == 200
+    assert r.get_json()["status"] == "ok"
+
+def test_version():
+    c = app.test_client()
+    r = c.get("/version")
+    assert r.status_code == 200
+    assert "version" in r.get_json()
+
+def test_index():
+    assert app.test_client().get("/").status_code == 200