Initial redis skill implementation

SKILL.md

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+---
+name: redis
+description: Redis in-memory cache with persistence and pub/sub
+metadata:
+  version: "1.0.0"
+  vibestack:
+    main: false
+    metrics-port: 9121
+---
+
+# Redis Skill
+
+Installs and configures [Redis](https://redis.io/) in-memory data store for caching, pub/sub messaging, and session storage.
+
+## Features
+
+- In-memory key-value store
+- RDB + AOF persistence
+- Pub/sub messaging
+- Optional authentication
+- Memory limit with eviction policy
+- Auto-registers with Caddy if domain set
+
+## Configuration
+
+### Environment Variables
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `REDIS_PORT` | `6379` | Redis port |
+| `REDIS_PASSWORD` | (none) | Optional authentication password |
+| `REDIS_MAXMEMORY` | `100mb` | Memory limit |
+| `REDIS_MAXMEMORY_POLICY` | `allkeys-lru` | Eviction policy when memory limit reached |
+| `REDIS_DATA_DIR` | `/data/redis` | Persistence directory |
+| `REDIS_APPENDONLY` | `yes` | Enable AOF persistence |
+| `REDIS_SAVE` | `900 1 300 10 60 10000` | RDB save intervals |
+| `REDIS_DOMAIN` | (none) | Domain for Caddy auto-config |
+
+### Output Variables
+
+After starting, the skill exports:
+
+| Variable | Example |
+|----------|---------|
+| `REDIS_URL` | `redis://:password@localhost:6379` |
+
+## Usage
+
+### As a dependency
+
+```yaml
+metadata:
+  vibestack:
+    requires:
+      - redis
+```
+
+### Connection
+
+```bash
+# Connect with redis-cli
+redis-cli -p 6379
+
+# With authentication
+redis-cli -p 6379 -a "$REDIS_PASSWORD"
+
+# From application
+REDIS_URL=redis://localhost:6379
+# or with auth
+REDIS_URL=redis://:password@localhost:6379
+```
+
+### Common Operations
+
+```bash
+# Set a key
+redis-cli SET mykey "Hello"
+
+# Get a key
+redis-cli GET mykey
+
+# Pub/sub
+redis-cli SUBSCRIBE mychannel
+redis-cli PUBLISH mychannel "Hello subscribers!"
+
+# Check memory usage
+redis-cli INFO memory
+```
+
+## Persistence
+
+Redis is configured with both RDB snapshots and AOF (Append Only File):
+
+- **RDB**: Point-in-time snapshots at configured intervals
+- **AOF**: Log of all write operations for durability
+
+Data is stored in `REDIS_DATA_DIR` (default: `/data/redis`).
+
+## Memory Management
+
+When `REDIS_MAXMEMORY` is reached, the `REDIS_MAXMEMORY_POLICY` determines behavior:
+
+| Policy | Description |
+|--------|-------------|
+| `allkeys-lru` | Evict least recently used keys (default) |
+| `volatile-lru` | Evict LRU keys with TTL set |
+| `allkeys-random` | Evict random keys |
+| `noeviction` | Return errors on write |
+
+## Caddy Integration
+
+If the `caddy` skill is present and `REDIS_DOMAIN` is set, Redis will be accessible via HTTPS (useful for Redis Insight or other GUI tools).
+
+## Security
+
+For production use:
+1. Always set `REDIS_PASSWORD`
+2. Restrict network access
+3. Use TLS for external connections

scripts/autorun.sh

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+#!/bin/bash
+set -e
+
+REDIS_DATA_DIR="${REDIS_DATA_DIR:-/data/redis}"
+SKILLS_DIR="${SKILLS_DIR:-/skills}"
+
+# Idempotent Redis installation
+install_redis() {
+    if command -v redis-server &>/dev/null; then
+        echo "Redis already installed: $(redis-server --version)"
+        return 0
+    fi
+
+    echo "Installing Redis..."
+
+    # Install dependencies
+    apt-get update
+    apt-get install -y curl gpg lsb-release
+
+    # Add Redis repository
+    curl -fsSL https://packages.redis.io/gpg | gpg --dearmor -o /usr/share/keyrings/redis-archive-keyring.gpg
+    echo "deb [signed-by=/usr/share/keyrings/redis-archive-keyring.gpg] https://packages.redis.io/deb $(lsb_release -cs) main" > /etc/apt/sources.list.d/redis.list
+
+    # Install Redis
+    apt-get update
+    apt-get install -y redis
+
+    echo "Redis installed: $(redis-server --version)"
+}
+
+# Setup directories
+setup_dirs() {
+    mkdir -p "$REDIS_DATA_DIR"
+    chown -R redis:redis "$REDIS_DATA_DIR" 2>/dev/null || true
+    chmod 755 "$REDIS_DATA_DIR"
+
+    echo "Redis data directory: $REDIS_DATA_DIR"
+}
+
+# Configure Caddy if present
+configure_caddy() {
+    local caddy_dir="$SKILLS_DIR/caddy"
+    local redis_domain="${REDIS_DOMAIN:-}"
+    local redis_port="${REDIS_PORT:-6379}"
+
+    if [ ! -d "$caddy_dir" ]; then
+        echo "Caddy not found - Redis will run standalone"
+        return 0
+    fi
+
+    if [ -z "$redis_domain" ]; then
+        echo "REDIS_DOMAIN not set - skipping Caddy config"
+        return 0
+    fi
+
+    echo "Caddy detected - configuring reverse proxy..."
+
+    local snippets_dir="$caddy_dir/snippets.d"
+    mkdir -p "$snippets_dir"
+
+    cat > "$snippets_dir/redis.caddy" << EOF
+# Auto-generated by redis skill
+# Note: Redis protocol is not HTTP - this is for Redis Insight or similar tools
+# $redis_domain {
+#     reverse_proxy localhost:$redis_port
+# }
+EOF
+
+    echo "Caddy snippet created (manual config needed for Redis)"
+}
+
+install_redis
+setup_dirs
+configure_caddy
+
+echo "Redis setup complete"

scripts/run.sh

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+#!/bin/bash
+set -e
+
+REDIS_PORT="${REDIS_PORT:-6379}"
+REDIS_PASSWORD="${REDIS_PASSWORD:-}"
+REDIS_MAXMEMORY="${REDIS_MAXMEMORY:-100mb}"
+REDIS_MAXMEMORY_POLICY="${REDIS_MAXMEMORY_POLICY:-allkeys-lru}"
+REDIS_DATA_DIR="${REDIS_DATA_DIR:-/data/redis}"
+REDIS_APPENDONLY="${REDIS_APPENDONLY:-yes}"
+REDIS_SAVE="${REDIS_SAVE:-900 1 300 10 60 10000}"
+
+# Build REDIS_URL
+if [ -n "$REDIS_PASSWORD" ]; then
+    export REDIS_URL="redis://:${REDIS_PASSWORD}@localhost:${REDIS_PORT}"
+else
+    export REDIS_URL="redis://localhost:${REDIS_PORT}"
+fi
+echo "REDIS_URL=$REDIS_URL"
+
+# Write to shared env file for other skills
+mkdir -p /run/vibestack
+echo "REDIS_URL=$REDIS_URL" > /run/vibestack/redis.env
+
+# Build command arguments
+args=()
+args+=("--port" "$REDIS_PORT")
+args+=("--dir" "$REDIS_DATA_DIR")
+args+=("--maxmemory" "$REDIS_MAXMEMORY")
+args+=("--maxmemory-policy" "$REDIS_MAXMEMORY_POLICY")
+args+=("--appendonly" "$REDIS_APPENDONLY")
+
+# Add authentication if set
+if [ -n "$REDIS_PASSWORD" ]; then
+    args+=("--requirepass" "$REDIS_PASSWORD")
+fi
+
+# Configure RDB persistence
+# REDIS_SAVE format: "seconds changes [seconds changes ...]"
+if [ -n "$REDIS_SAVE" ]; then
+    # Parse save intervals (e.g., "900 1 300 10 60 10000")
+    read -ra save_args <<< "$REDIS_SAVE"
+    for ((i=0; i<${#save_args[@]}; i+=2)); do
+        if [ $((i+1)) -lt ${#save_args[@]} ]; then
+            args+=("--save" "${save_args[i]} ${save_args[i+1]}")
+        fi
+    done
+fi
+
+# Bind to all interfaces
+args+=("--bind" "0.0.0.0")
+
+# Enable protected mode only if no password
+if [ -z "$REDIS_PASSWORD" ]; then
+    args+=("--protected-mode" "yes")
+else
+    args+=("--protected-mode" "no")
+fi
+
+echo "Starting Redis on port $REDIS_PORT..."
+echo "Max memory: $REDIS_MAXMEMORY"
+echo "Eviction policy: $REDIS_MAXMEMORY_POLICY"
+echo "Persistence: AOF=$REDIS_APPENDONLY"
+
+exec redis-server "${args[@]}"