++ add secrets-contract-probe test app for brusnika-stage acceptance test

test-app/Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+RUN pip install --no-cache-dir pika==1.3.2
+
+COPY app.py .
+
+USER 65534:65534
+
+CMD ["python", "app.py"]

test-app/app.py

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+"""Secrets-contract acceptance probe.
+
+Connects to RabbitMQ using credentials read from a Kubernetes Secret produced
+by the v2 secrets contract (schema=rabbitmq.v1) and, every PROBE_INTERVAL_SECONDS,
+publishes a message to PROBE_QUEUE and immediately consumes it back. Success
+or failure is logged; message bodies never contain secret values.
+"""
+import json
+import logging
+import os
+import time
+
+import pika
+
+logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")
+log = logging.getLogger("secrets-contract-probe")
+
+QUEUE = os.environ.get("PROBE_QUEUE", "test-terraform-probe")
+INTERVAL = int(os.environ.get("PROBE_INTERVAL_SECONDS", "15"))
+
+
+def env(name: str) -> str:
+    value = os.environ.get(name, "")
+    if not value:
+        raise RuntimeError(f"missing required env var {name}")
+    return value
+
+
+def connect() -> pika.BlockingConnection:
+    params = pika.ConnectionParameters(
+        host=env("RABBITMQ_HOST"),
+        port=int(env("RABBITMQ_PORT")),
+        virtual_host=env("RABBITMQ_VHOST"),
+        credentials=pika.PlainCredentials(env("RABBITMQ_USERNAME"), env("RABBITMQ_PASSWORD")),
+        heartbeat=30,
+        blocked_connection_timeout=10,
+    )
+    return pika.BlockingConnection(params)
+
+
+def main() -> None:
+    log.info("starting probe: host=%s vhost=%s queue=%s interval=%ss",
+              os.environ.get("RABBITMQ_HOST"), os.environ.get("RABBITMQ_VHOST"), QUEUE, INTERVAL)
+
+    conn = connect()
+    channel = conn.channel()
+    channel.queue_declare(queue=QUEUE, durable=True)
+    log.info("connected to rabbitmq, entering probe loop")
+
+    seq = 0
+    while True:
+        seq += 1
+        try:
+            payload = json.dumps({"seq": seq, "ts": time.time()})
+            channel.basic_publish(exchange="", routing_key=QUEUE, body=payload)
+            log.info("published probe seq=%d", seq)
+
+            method, _props, _body = channel.basic_get(queue=QUEUE, auto_ack=False)
+            if method is None:
+                log.error("probe seq=%d FAILED: nothing to consume right after publish", seq)
+            else:
+                channel.basic_ack(method.delivery_tag)
+                log.info("consumed+acked probe seq=%d OK", seq)
+        except Exception:  # noqa: BLE001 - keep the loop alive, log and retry
+            log.exception("probe seq=%d FAILED", seq)
+            try:
+                conn = connect()
+                channel = conn.channel()
+                channel.queue_declare(queue=QUEUE, durable=True)
+                log.info("reconnected to rabbitmq")
+            except Exception:  # noqa: BLE001
+                log.exception("reconnect failed, will retry next cycle")
+
+        time.sleep(INTERVAL)
+
+
+if __name__ == "__main__":
+    main()

test-app/deployment.yaml

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+# Acceptance-test deployment for the v2 secrets contract (SECRETS-CONTRACT-PLAN.md).
+# Applied manually with kubectl after `live/namespace`, `live/rabbitmq` and
+# `live/secrets` are applied for INFRA_ENV=brusnika-stage - not part of any
+# terragrunt stack, this is a throwaway probe, not managed infrastructure.
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: secrets-contract-probe
+  namespace: test-terraform
+  labels:
+    app: secrets-contract-probe
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: secrets-contract-probe
+  template:
+    metadata:
+      labels:
+        app: secrets-contract-probe
+    spec:
+      imagePullSecrets:
+        - name: regcred
+      containers:
+        - name: probe
+          image: cr.yandex/crp3ccidau046kdj8g9q/secrets-contract-probe:v1
+          env:
+            - name: RABBITMQ_HOST
+              valueFrom: { secretKeyRef: { name: rabbitmq, key: host } }
+            - name: RABBITMQ_PORT
+              valueFrom: { secretKeyRef: { name: rabbitmq, key: port } }
+            - name: RABBITMQ_VHOST
+              valueFrom: { secretKeyRef: { name: rabbitmq, key: vhost } }
+            - name: RABBITMQ_USERNAME
+              valueFrom: { secretKeyRef: { name: rabbitmq, key: username } }
+            - name: RABBITMQ_PASSWORD
+              valueFrom: { secretKeyRef: { name: rabbitmq, key: password } }
+            - name: PROBE_QUEUE
+              value: test-terraform-probe
+            - name: PROBE_INTERVAL_SECONDS
+              value: "15"
+          resources:
+            requests:
+              cpu: 10m
+              memory: 32Mi
+            limits:
+              cpu: 100m
+              memory: 64Mi