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+# argocd-watcher
+
+An **ArgoCD application watcher** monitors the CRUD (Create, Read, Update, Delete) operations of ArgoCD Application custom resources (CRs) and saves the events to Redis for further processing.
+
+## Key Functionality
+
+- **Watch CRUD Operations**: Detect changes to ArgoCD Application CRs in real-time.
+- **Redis Integration**: Save event data into a Redis database with the Redis key `<appproject-name>|<application>`, value: `<application>`.
+
+## Use Cases
+
+Integrates with [argocd-proxy](https://github.com/hsiaoairplane/argocd-proxy) project to enhance the ArgoCD list application API performance which the ArgoCD application is read from the Redis cache and perform RBAC filtering in-memory rather than list the ArgoCD application from Application CRs and perform the RBAC filtering thru. the [casbin](https://github.com/casbin/casbin) package.
+
+## Requirements
+
+- **ArgoCD**: A working ArgoCD setup with applications.
+- **Kubernetes**: A Kubernetes cluster where ArgoCD is deployed.
+- **Redis**: A running Redis instance to store event data.
+- **Go**: Installed Go environment for building and running the watcher.
+
+## Installation
+
+1. Clone this repository:
+   ```console
+   git clone git@github.com:hsiaoairplane/argocd-watcher.git
+   cd argocd-watcher
+   ```
+
+2. Build the watcher:
+   ```console
+   go build -o argocd-watcher *.go
+   ```
+
+3. Deploy to Kubernetes:
+   
+   - Ensure Redis is running and accessible within your cluster.
+   - Apply the necessary RBAC roles and bindings for the watcher to access ArgoCD resources.
+   - Create a Kubernetes deployment for the watcher.
+
+   Example deployment:
+   ```yaml
+   apiVersion: apps/v1
+   kind: Deployment
+   metadata:
+     name: argocd-watcher
+   spec:
+     replicas: 1
+     selector:
+       matchLabels:
+         app: argocd-watcher
+     template:
+       metadata:
+         labels:
+           app: argocd-watcher
+       spec:
+         containers:
+         - name: argocd-watcher
+           image: hsiaoairplane/argocd-watcher:latest
+   ```
+
+4. Run the watcher locally for testing:
+   ```console
+   ./argocd-watcher --argocd-namespace=<argocd-namespace> --redis-address=<redis-address> --redis-db=<redis-db-index>
+   ```
+
+## Configuration
+
+- **Flags**:
+  - `--argocd-namespace`: Namespace to monitor.
+  - `--redis-address`: Redis server address.
+  - `--redis-db`: Redis DB index.
+
+## How It Works
+
+1. The watcher uses the Kubernetes API to monitor ArgoCD Application resources.
+2. On detecting a CRUD operation, it captures relevant event data (e.g., application name, namespace, operation type).
+3. The data is formatted and pushed to a Redis database for further usage.