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‎docs/PROXY_INTEGRATION.md‎

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# AMQP Proxy Sidecar Integration
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## Overview
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The RabbitMQ controller now automatically deploys an AMQP durability proxy as a sidecar container during upgrades and queue type migrations. This proxy enables seamless migration from classic/mirrored queues to quorum queues without requiring immediate OpenStack dataplane reconfiguration.
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## Problem Solved
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When migrating from RabbitMQ 3.9 (mirrored queues) to 4.2 (quorum queues), external OpenStack services have `amqp_durable_queues=false` configured. However, quorum queues require `durable=True`, causing `PRECONDITION_FAILED` errors. The proxy transparently rewrites AMQP frames to force durability, allowing non-durable clients to work with durable quorum queues.
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## Architecture
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```
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┌─────────────────────────────────────────┐
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│ RabbitMQ Pod │
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│ │
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│ ┌───────────────────┐ │
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│ │ amqp-proxy │ Port: 5672 │
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│ │ (with TLS) │ (external) │
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│ └─────────┬─────────┘ │
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│ │ localhost:5673 │
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│ ↓ (no TLS) │
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│ ┌───────────────────┐ │
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│ │ rabbitmq │ Port: 5673 │
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│ │ │ (localhost) │
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│ └───────────────────┘ │
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└─────────────────────────────────────────┘
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↑ Port 5672 (TLS)
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│
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External clients
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```
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## How It Works
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1. **Automatic Activation**: Proxy sidecar is automatically added when:
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- Upgrade is in progress (`Status.UpgradePhase != ""`)
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- Migrating to quorum queues before dataplane is reconfigured
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- Annotation `rabbitmq.openstack.org/enable-proxy=true` is set
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2. **TLS Handling**:
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- Proxy terminates TLS on port 5672 (using certs from `Spec.TLS.SecretName`)
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- RabbitMQ listens on localhost:5673 without TLS
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- External clients connect to proxy with TLS
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3. **Frame Rewriting**: Proxy intercepts AMQP frames and:
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- Rewrites `queue.declare(durable=False)` → `durable=True` + `x-queue-type=quorum`
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- Rewrites `exchange.declare(durable=False)` → `durable=True`
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- Skips reply queues and system queues
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4. **Automatic Removal**: Proxy is removed after:
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- Dataplane is reconfigured with `amqp_durable_queues=true`
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- User sets annotation `rabbitmq.openstack.org/clients-reconfigured=true`
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## Files Created/Modified
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### New Files
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- `internal/controller/rabbitmq/proxy.go` - Proxy sidecar integration logic
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- `internal/controller/rabbitmq/data/proxy.py` - AMQP proxy script (embedded)
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- `internal/controller/rabbitmq/data/README.md` - Documentation for data files
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- `PROXY_INTEGRATION.md` - Complete integration documentation
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### Modified Files
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- `internal/controller/rabbitmq/rabbitmq_controller.go` (lines 805-835):
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- Added proxy sidecar logic after `ConfigureCluster`
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- Calls `ensureProxyConfigMap`, `addProxySidecar`, `configureRabbitMQBackendPort`
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- Removes proxy when `shouldEnableProxy()` returns false
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## Key Functions
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### proxy.go
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- `ensureProxyConfigMap(ctx, instance, helper)` - Creates ConfigMap with embedded proxy script
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- `addProxySidecar(instance, cluster)` - Adds proxy container to StatefulSet
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- `buildProxySidecarContainer(instance)` - Builds container spec with TLS support
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- `removeProxySidecar(cluster)` - Removes proxy sidecar
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- `shouldEnableProxy(instance)` - Determines when proxy should be enabled
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- `configureRabbitMQBackendPort(instance, cluster)` - Configures RabbitMQ to listen on localhost:5673
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## Container Spec
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- **Image**: `quay.io/openstack-k8s-operators/openstack-operator-client:latest`
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- **Command**: `python3 /scripts/proxy.py`
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- **Args**:
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- `--backend localhost:5673`
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- `--listen 0.0.0.0:5672`
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- `--tls-cert /etc/rabbitmq-tls/tls.crt` (if TLS enabled)
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- `--tls-key /etc/rabbitmq-tls/tls.key` (if TLS enabled)
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- `--tls-ca /etc/rabbitmq-tls-ca/ca.crt` (if CA specified)
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- **Resources**:
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- Requests: 128Mi memory, 100m CPU
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- Limits: 256Mi memory, 500m CPU
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- **Probes**: TCP liveness and readiness on port 5672
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## Usage
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### Automatic (during upgrade)
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The proxy is automatically enabled when upgrading RabbitMQ:
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```yaml
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apiVersion: rabbitmq.openstack.org/v1beta1
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kind: RabbitMq
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metadata:
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name: rabbitmq
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annotations:
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rabbitmq.openstack.org/target-version: "4.2.0"
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spec:
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queueType: Quorum
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tls:
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secretName: rabbitmq-tls
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```
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### Manual activation
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Force proxy activation with annotation:
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```bash
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kubectl annotate rabbitmq rabbitmq \
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rabbitmq.openstack.org/enable-proxy=true
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```
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### Manual deactivation
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After dataplane reconfiguration:
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```bash
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kubectl annotate rabbitmq rabbitmq \
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rabbitmq.openstack.org/clients-reconfigured=true
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```
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## Monitoring
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Check proxy logs:
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```bash
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kubectl logs rabbitmq-server-0 -c amqp-proxy
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```
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Proxy prints statistics every 5 minutes:
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```
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=== Proxy Statistics ===
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Total connections: 25
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Queue rewrites: 120
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Exchange rewrites: 15
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Bytes forwarded: 5,432,100
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```
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## Upgrade Workflow
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1. **Start upgrade**: Set target-version annotation → Proxy enabled
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2. **Cluster recreated**: RabbitMQ 4.2 with quorum queues + proxy sidecar
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3. **External services**: Continue using `amqp_durable_queues=false`
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4. **Proxy rewrites**: Frames rewritten to use durable queues
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5. **Dataplane reconfig**: Update services to `amqp_durable_queues=true`
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6. **Set annotation**: `clients-reconfigured=true` → Proxy removed
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7. **Direct connection**: Services connect directly to RabbitMQ
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## Important Notes
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### Proxy Script Location
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The proxy script is located at:
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- `internal/controller/rabbitmq/data/proxy.py`
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When updating the proxy:
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1. Edit `internal/controller/rabbitmq/data/proxy.py`
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2. Rebuild: `make`
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3. Test: `make test`
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### Performance
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- Proxy adds ~0.05ms latency (localhost forwarding)
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- Memory overhead: ~64Mi per RabbitMQ pod
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- CPU overhead: ~20m per RabbitMQ pod
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### Security
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- Runs as non-root
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- No privilege escalation
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- Drops all capabilities
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- TLS certificates mounted read-only
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## Testing
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### Go Unit Tests
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Proxy sidecar integration tests verify:
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- ✅ Proxy is added during upgrades
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- ✅ TLS configuration is correct
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- ✅ Proxy is removed after client reconfiguration
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- ✅ Manual activation via annotations
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Run tests:
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```bash
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make test
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# Test Suite Passed
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# composite coverage: 72.7% of statements
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# Run only proxy tests
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cd test/functional
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ginkgo -focus="RabbitMQ Proxy"
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```
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### Python Integration Test
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Simulates Oslo messaging client with `amqp_durable_queues=false` connecting through proxy to RabbitMQ with quorum queues.
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Quick test:
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```bash
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cd internal/controller/rabbitmq/data
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python3 proxy_test.py --host localhost --port 5672
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```
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For complete testing documentation, see [TESTING.md](internal/controller/rabbitmq/data/TESTING.md).
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## References
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- Proxy implementation: `internal/controller/rabbitmq/data/proxy.py`
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- Proxy integration: `internal/controller/rabbitmq/proxy.go`
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- AMQP 0-9-1 spec: https://www.rabbitmq.com/resources/specs/amqp0-9-1.pdf

‎internal/controller/rabbitmq/data/README.md‎

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# RabbitMQ Controller Data Files
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This directory contains embedded data files used by the RabbitMQ controller.
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## Files
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### proxy.py
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The AMQP durability proxy script that is deployed as a sidecar container during RabbitMQ upgrades and queue type migrations.
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**Purpose**: Transparently rewrites AMQP frames to force `durable=True`, enabling non-durable clients (OpenStack services with `amqp_durable_queues=false`) to work with durable quorum queues.
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**Deployment**: Embedded at build time using Go's `embed` directive in `proxy.go` and deployed as a ConfigMap to RabbitMQ pods.
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**Usage**: See [PROXY_INTEGRATION.md](../../../PROXY_INTEGRATION.md) for complete documentation.
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### proxy_test.py
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Integration test that simulates an Oslo messaging client (with `amqp_durable_queues=false`) connecting through the proxy to RabbitMQ with quorum queues.
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**Usage**: See [TESTING.md](TESTING.md) for how to run the tests.
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## Modifying the Proxy
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When updating the proxy script:
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1. Edit `internal/controller/rabbitmq/data/proxy.py`
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2. Rebuild the operator: `make`
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3. Run tests: `make test`
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4. Run integration test: `python3 proxy_test.py` (see [TESTING.md](TESTING.md))
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The proxy is embedded at compile time, so changes require a rebuild.

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