commerce/deploy/scripts/switch-active.sh

#!/bin/bash
# Hanzo Commerce - Blue-Green Deployment Switch Script
#
# Usage:
#   ./deploy/scripts/switch-active.sh [blue|green]
#   ./deploy/scripts/switch-active.sh status
#
# This script updates the nginx upstream to point to the specified deployment.

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
DEPLOY_DIR="$(dirname "$SCRIPT_DIR")"
NGINX_CONF="$DEPLOY_DIR/nginx/conf.d/active.conf"

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
BLUE='\033[0;34m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

log_info() { echo -e "${BLUE}[INFO]${NC} $1"; }
log_success() { echo -e "${GREEN}[SUCCESS]${NC} $1"; }
log_warn() { echo -e "${YELLOW}[WARN]${NC} $1"; }
log_error() { echo -e "${RED}[ERROR]${NC} $1"; }

# Get current active deployment
get_active() {
    if [ -f "$NGINX_CONF" ]; then
        grep -oP 'server commerce-\K(blue|green)' "$NGINX_CONF" 2>/dev/null | head -1 || echo "unknown"
    else
        echo "blue"  # Default
    fi
}

# Check deployment health
check_health() {
    local color=$1
    local container="commerce-${color}"

    if docker inspect "$container" &>/dev/null; then
        local health=$(docker inspect --format='{{.State.Health.Status}}' "$container" 2>/dev/null || echo "unknown")
        echo "$health"
    else
        echo "not_running"
    fi
}

# Display status
show_status() {
    local active=$(get_active)
    local blue_health=$(check_health "blue")
    local green_health=$(check_health "green")

    echo ""
    echo "============================================"
    echo "  Hanzo Commerce - Deployment Status"
    echo "============================================"
    echo ""
    echo "  Active Deployment: ${active^^}"
    echo ""
    echo "  Blue Deployment:"
    if [ "$blue_health" == "healthy" ]; then
        echo -e "    Status: ${GREEN}HEALTHY${NC}"
    elif [ "$blue_health" == "not_running" ]; then
        echo -e "    Status: ${YELLOW}NOT RUNNING${NC}"
    else
        echo -e "    Status: ${RED}${blue_health^^}${NC}"
    fi
    echo ""
    echo "  Green Deployment:"
    if [ "$green_health" == "healthy" ]; then
        echo -e "    Status: ${GREEN}HEALTHY${NC}"
    elif [ "$green_health" == "not_running" ]; then
        echo -e "    Status: ${YELLOW}NOT RUNNING${NC}"
    else
        echo -e "    Status: ${RED}${green_health^^}${NC}"
    fi
    echo ""
    echo "============================================"
}

# Switch active deployment
switch_to() {
    local target=$1
    local current=$(get_active)

    log_info "Switching from ${current} to ${target}..."

    # Check target health
    local target_health=$(check_health "$target")
    if [ "$target_health" != "healthy" ]; then
        log_error "Target deployment '${target}' is not healthy (status: ${target_health})"
        log_error "Cannot switch to unhealthy deployment. Please check the container."
        exit 1
    fi

    # Create/update nginx upstream config
    mkdir -p "$(dirname "$NGINX_CONF")"
    cat > "$NGINX_CONF" << EOF
# Active deployment configuration
# Generated by switch-active.sh at $(date -Iseconds)
# Active: ${target}

upstream commerce_active {
    server commerce-${target}:8001 max_fails=3 fail_timeout=30s;
    keepalive 32;
}
EOF

    log_info "Updated nginx configuration"

    # Reload nginx
    if docker exec commerce-nginx nginx -t &>/dev/null; then
        docker exec commerce-nginx nginx -s reload
        log_success "Nginx reloaded successfully"
    else
        log_error "Nginx configuration test failed!"
        exit 1
    fi

    # Verify switch
    sleep 2
    local new_active=$(get_active)
    if [ "$new_active" == "$target" ]; then
        log_success "Successfully switched to ${target^^} deployment"
    else
        log_error "Switch verification failed"
        exit 1
    fi
}

# Main
main() {
    case "${1:-status}" in
        blue|green)
            switch_to "$1"
            ;;
        status)
            show_status
            ;;
        *)
            echo "Usage: $0 [blue|green|status]"
            echo ""
            echo "Commands:"
            echo "  blue    - Switch traffic to blue deployment"
            echo "  green   - Switch traffic to green deployment"
            echo "  status  - Show current deployment status"
            exit 1
            ;;
    esac
}

main "$@"