Service Mesh in TuskLang - Bash Guide

🌐 Revolutionary Service Mesh Configuration

Service mesh in TuskLang transforms your configuration files into intelligent, inter-service communication systems. No more manual service discovery or rigid routing—everything lives in your TuskLang configuration with dynamic service discovery, intelligent traffic management, and comprehensive service observability.

> "We don't bow to any king" – TuskLang service mesh breaks free from traditional service communication constraints and brings modern microservices orchestration to your Bash applications.

🚀 Core Service Mesh Directives

Basic Service Mesh Setup

#service-mesh: enabled                 # Enable service mesh
#mesh-enabled: true                   # Alternative syntax
#mesh-discovery: true                 # Enable service discovery
#mesh-routing: true                   # Enable traffic routing
#mesh-load-balancing: true            # Enable load balancing
#mesh-circuit-breaker: true           # Enable circuit breaker

Advanced Service Mesh Configuration

#mesh-observability: true             # Enable observability
#mesh-security: true                  # Enable service security
#mesh-policy: true                    # Enable policy enforcement
#mesh-monitoring: true                # Enable mesh monitoring
#mesh-tracing: true                   # Enable distributed tracing
#mesh-metrics: true                   # Enable service metrics

🔧 Bash Service Mesh Implementation

Basic Service Mesh Manager

#!/bin/bash
Load service mesh configuration
source <(tsk load service-mesh.tsk)
Service mesh configuration
MESH_ENABLED="${mesh_enabled:-true}"
MESH_DISCOVERY="${mesh_discovery:-true}"
MESH_ROUTING="${mesh_routing:-true}"
MESH_LOAD_BALANCING="${mesh_load_balancing:-true}"
MESH_CIRCUIT_BREAKER="${mesh_circuit_breaker:-true}"
Service mesh manager
class ServiceMeshManager {
    constructor() {
        this.enabled = MESH_ENABLED
        this.discovery = MESH_DISCOVERY
        this.routing = MESH_ROUTING
        this.loadBalancing = MESH_LOAD_BALANCING
        this.circuitBreaker = MESH_CIRCUIT_BREAKER
        this.services = new Map()
        this.routes = new Map()
        this.stats = {
            service_discoveries: 0,
            route_requests: 0,
            circuit_breaks: 0
        }
    }
    
    registerService(service) {
        if (!this.discovery) return
        
        this.services.set(service.name, {
            ...service,
            status: 'healthy',
            lastSeen: Date.now(),
            endpoints: []
        })
        
        this.stats.service_discoveries++
    }
    
    discoverService(serviceName) {
        if (!this.discovery) return null
        
        const service = this.services.get(serviceName)
        if (service && service.status === 'healthy') {
            return service
        }
        
        return null
    }
    
    routeRequest(serviceName, request) {
        if (!this.routing) return null
        
        const service = this.discoverService(serviceName)
        if (!service) return null
        
        // Apply routing rules
        const route = this.getRoute(serviceName, request)
        if (route) {
            this.stats.route_requests++
            return this.executeRoute(route, request)
        }
        
        return null
    }
    
    getRoute(serviceName, request) {
        const routes = this.routes.get(serviceName) || []
        
        // Find matching route
        for (const route of routes) {
            if (this.matchesRoute(route, request)) {
                return route
            }
        }
        
        return null
    }
    
    matchesRoute(route, request) {
        // Implementation for route matching
        return true
    }
    
    executeRoute(route, request) {
        // Implementation for route execution
        return { success: true, data: 'response' }
    }
    
    getStats() {
        return { ...this.stats }
    }
}
Initialize service mesh manager
const serviceMeshManager = new ServiceMeshManager()

Dynamic Service Discovery

#!/bin/bash
Dynamic service discovery
discover_services() {
    local discovery_file="/var/log/service-mesh/discovery.json"
    local services=()
    
    # Discover services from various sources
    discover_docker_services
    discover_kubernetes_services
    discover_custom_services
    
    # Generate discovery report
    cat > "$discovery_file" << EOF
{
    "timestamp": "$(date -Iseconds)",
    "services": $(printf '%s\n' "${services[@]}" | jq -R . | jq -s .)
}
EOF
    
    echo "✓ Service discovery completed"
}
discover_docker_services() {
    if command -v docker >/dev/null 2>&1; then
        while IFS= read -r container; do
            if [[ -n "$container" ]]; then
                local service_name=$(docker inspect "$container" --format '{{.Config.Labels.service_name}}' 2>/dev/null)
                local service_port=$(docker inspect "$container" --format '{{.Config.ExposedPorts}}' 2>/dev/null | grep -o '[0-9]*' | head -1)
                
                if [[ -n "$service_name" ]] && [[ -n "$service_port" ]]; then
                    register_service "$service_name" "$container" "$service_port"
                fi
            fi
        done < <(docker ps --format "{{.Names}}" | grep -v "service-mesh")
    fi
}
discover_kubernetes_services() {
    if command -v kubectl >/dev/null 2>&1; then
        while IFS= read -r service; do
            if [[ -n "$service" ]]; then
                local service_name=$(echo "$service" | awk '{print $1}')
                local service_port=$(echo "$service" | awk '{print $5}' | cut -d'/' -f1)
                
                register_service "$service_name" "k8s-$service_name" "$service_port"
            fi
        done < <(kubectl get services --no-headers 2>/dev/null)
    fi
}
discover_custom_services() {
    local custom_services_file="${mesh_custom_services_file:-/etc/service-mesh/custom-services.conf}"
    
    if [[ -f "$custom_services_file" ]]; then
        while IFS= read -r service_line; do
            local service_name="${service_line%:*}"
            local service_config="${service_line#*:}"
            IFS=',' read -r host port <<< "$service_config"
            
            register_service "$service_name" "$host" "$port"
        done < "$custom_services_file"
    fi
}
register_service() {
    local service_name="$1"
    local host="$2"
    local port="$3"
    local service_file="/tmp/service_mesh_${service_name//[^a-zA-Z0-9]/_}.json"
    
    cat > "$service_file" << EOF
{
    "name": "$service_name",
    "host": "$host",
    "port": "$port",
    "status": "healthy",
    "last_seen": "$(date -Iseconds)",
    "endpoints": ["$host:$port"]
}
EOF
    
    echo "✓ Service registered: $service_name ($host:$port)"
}

Intelligent Traffic Routing

#!/bin/bash
Intelligent traffic routing
route_traffic() {
    local service_name="$1"
    local request_path="$2"
    local request_method="${3:-GET}"
    local request_headers="${4:-}"
    
    # Get service information
    local service_info=$(get_service_info "$service_name")
    if [[ -z "$service_info" ]]; then
        echo "Service not found: $service_name"
        return 1
    fi
    
    # Apply routing rules
    local route=$(get_routing_rule "$service_name" "$request_path" "$request_method")
    if [[ -n "$route" ]]; then
        execute_route "$route" "$request_path" "$request_method" "$request_headers"
    else
        # Default routing
        default_route "$service_info" "$request_path" "$request_method" "$request_headers"
    fi
}
get_service_info() {
    local service_name="$1"
    local service_file="/tmp/service_mesh_${service_name//[^a-zA-Z0-9]/_}.json"
    
    if [[ -f "$service_file" ]]; then
        cat "$service_file"
    fi
}
get_routing_rule() {
    local service_name="$1"
    local request_path="$2"
    local request_method="$3"
    local routing_file="${mesh_routing_file:-/etc/service-mesh/routing.conf}"
    
    if [[ -f "$routing_file" ]]; then
        while IFS= read -r rule_line; do
            IFS='|' read -r service pattern method target <<< "$rule_line"
            
            if [[ "$service" == "$service_name" ]] && \
               [[ "$request_path" =~ $pattern ]] && \
               [[ "$request_method" == "$method" ]]; then
                echo "$target"
                return 0
            fi
        done < "$routing_file"
    fi
    
    return 1
}
execute_route() {
    local route="$1"
    local request_path="$2"
    local request_method="$3"
    local request_headers="$4"
    
    echo "Executing route: $route"
    
    # Parse route configuration
    IFS=':' read -r target_host target_port <<< "$route"
    
    # Forward request
    forward_request "$target_host" "$target_port" "$request_path" "$request_method" "$request_headers"
}
default_route() {
    local service_info="$1"
    local request_path="$2"
    local request_method="$3"
    local request_headers="$4"
    
    # Extract service details
    local host=$(echo "$service_info" | jq -r '.host')
    local port=$(echo "$service_info" | jq -r '.port')
    
    # Forward request to default endpoint
    forward_request "$host" "$port" "$request_path" "$request_method" "$request_headers"
}
forward_request() {
    local host="$1"
    local port="$2"
    local path="$3"
    local method="$4"
    local headers="$5"
    
    echo "Forwarding $method request to $host:$port$path"
    
    # Use curl to forward request
    local curl_cmd="curl -s -X $method"
    
    # Add headers if provided
    if [[ -n "$headers" ]]; then
        IFS=',' read -ra header_array <<< "$headers"
        for header in "${header_array[@]}"; do
            curl_cmd="$curl_cmd -H '$header'"
        done
    fi
    
    # Execute request
    eval "$curl_cmd 'http://$host:$port$path'"
}

Circuit Breaker Pattern

#!/bin/bash
Circuit breaker pattern
circuit_breaker() {
    local service_name="$1"
    local command="$2"
    local failure_threshold="${3:-5}"
    local timeout="${4:-60}"
    
    local breaker_file="/tmp/circuit_breaker_${service_name//[^a-zA-Z0-9]/_}.json"
    
    # Check circuit breaker state
    if [[ -f "$breaker_file" ]]; then
        local state=$(jq -r '.state' "$breaker_file" 2>/dev/null)
        local last_failure=$(jq -r '.last_failure' "$breaker_file" 2>/dev/null)
        local failure_count=$(jq -r '.failure_count' "$breaker_file" 2>/dev/null)
        
        case "$state" in
            "open")
                # Check if timeout has passed
                local current_time=$(date +%s)
                local failure_time=$(date -d "$last_failure" +%s 2>/dev/null || echo 0)
                
                if [[ $((current_time - failure_time)) -gt $timeout ]]; then
                    echo "Circuit breaker timeout passed, attempting operation..."
                    set_circuit_breaker_state "$service_name" "half_open"
                else
                    echo "Circuit breaker is open, operation blocked"
                    return 1
                fi
                ;;
            "half_open")
                echo "Circuit breaker is half-open, attempting operation..."
                ;;
            "closed")
                echo "Circuit breaker is closed, proceeding with operation..."
                ;;
        esac
    else
        # Initialize circuit breaker
        set_circuit_breaker_state "$service_name" "closed"
    fi
    
    # Execute command
    if eval "$command"; then
        # Success - close circuit breaker
        set_circuit_breaker_state "$service_name" "closed"
        echo "✓ Operation succeeded, circuit breaker closed"
        return 0
    else
        # Failure - update circuit breaker
        local current_failures=$((failure_count + 1))
        
        if [[ $current_failures -ge $failure_threshold ]]; then
            set_circuit_breaker_state "$service_name" "open"
            echo "✗ Circuit breaker opened due to $current_failures failures"
        else
            set_circuit_breaker_state "$service_name" "closed" "$current_failures"
            echo "✗ Operation failed, failure count: $current_failures"
        fi
        
        return 1
    fi
}
set_circuit_breaker_state() {
    local service_name="$1"
    local state="$2"
    local failure_count="${3:-0}"
    
    local breaker_file="/tmp/circuit_breaker_${service_name//[^a-zA-Z0-9]/_}.json"
    
    cat > "$breaker_file" << EOF
{
    "service": "$service_name",
    "state": "$state",
    "failure_count": $failure_count,
    "last_failure": "$(date -Iseconds)",
    "last_updated": "$(date -Iseconds)"
}
EOF
}

Service Mesh Observability

#!/bin/bash
Service mesh observability
mesh_observability() {
    local observability_file="/var/log/service-mesh/observability.json"
    
    # Collect mesh metrics
    local total_services=$(get_total_services)
    local healthy_services=$(get_healthy_services)
    local total_requests=$(get_total_requests)
    local failed_requests=$(get_failed_requests)
    local average_response_time=$(get_average_response_time)
    
    # Generate observability report
    cat > "$observability_file" << EOF
{
    "timestamp": "$(date -Iseconds)",
    "total_services": $total_services,
    "healthy_services": $healthy_services,
    "unhealthy_services": $((total_services - healthy_services)),
    "health_percentage": $((healthy_services * 100 / total_services)),
    "total_requests": $total_requests,
    "failed_requests": $failed_requests,
    "success_rate": $(((total_requests - failed_requests) * 100 / total_requests)),
    "average_response_time_ms": $average_response_time
}
EOF
    
    echo "✓ Service mesh observability completed"
}
get_total_services() {
    find /tmp -name "service_mesh_*.json" -type f | wc -l
}
get_healthy_services() {
    local healthy_count=0
    
    while IFS= read -r service_file; do
        if [[ -f "$service_file" ]]; then
            local status=$(jq -r '.status' "$service_file" 2>/dev/null)
            if [[ "$status" == "healthy" ]]; then
                healthy_count=$((healthy_count + 1))
            fi
        fi
    done < <(find /tmp -name "service_mesh_*.json" -type f)
    
    echo "$healthy_count"
}
get_total_requests() {
    local request_log="/var/log/service-mesh/requests.log"
    
    if [[ -f "$request_log" ]]; then
        wc -l < "$request_log"
    else
        echo "0"
    fi
}
get_failed_requests() {
    local request_log="/var/log/service-mesh/requests.log"
    
    if [[ -f "$request_log" ]]; then
        grep -c "FAILED" "$request_log" 2>/dev/null || echo "0"
    else
        echo "0"
    fi
}
get_average_response_time() {
    local request_log="/var/log/service-mesh/requests.log"
    
    if [[ -f "$request_log" ]]; then
        local total_time=0
        local request_count=0
        
        while IFS= read -r log_line; do
            local response_time=$(echo "$log_line" | grep -o 'response_time=[0-9]*' | cut -d'=' -f2)
            if [[ -n "$response_time" ]]; then
                total_time=$((total_time + response_time))
                request_count=$((request_count + 1))
            fi
        done < "$request_log"
        
        if [[ $request_count -gt 0 ]]; then
            echo $((total_time / request_count))
        else
            echo "0"
        fi
    else
        echo "0"
    fi
}

Service Mesh Security

#!/bin/bash
Service mesh security
mesh_security() {
    local security_file="/var/log/service-mesh/security.json"
    
    # Collect security metrics
    local authenticated_requests=$(get_authenticated_requests)
    local unauthorized_requests=$(get_unauthorized_requests)
    local encrypted_connections=$(get_encrypted_connections)
    local security_violations=$(get_security_violations)
    
    # Generate security report
    cat > "$security_file" << EOF
{
    "timestamp": "$(date -Iseconds)",
    "authenticated_requests": $authenticated_requests,
    "unauthorized_requests": $unauthorized_requests,
    "encrypted_connections": $encrypted_connections,
    "security_violations": $security_violations,
    "security_score": "$(calculate_security_score $authenticated_requests $unauthorized_requests)"
}
EOF
    
    echo "✓ Service mesh security completed"
}
get_authenticated_requests() {
    local request_log="/var/log/service-mesh/requests.log"
    
    if [[ -f "$request_log" ]]; then
        grep -c "AUTHENTICATED" "$request_log" 2>/dev/null || echo "0"
    else
        echo "0"
    fi
}
get_unauthorized_requests() {
    local request_log="/var/log/service-mesh/requests.log"
    
    if [[ -f "$request_log" ]]; then
        grep -c "UNAUTHORIZED" "$request_log" 2>/dev/null || echo "0"
    else
        echo "0"
    fi
}
get_encrypted_connections() {
    local connection_log="/var/log/service-mesh/connections.log"
    
    if [[ -f "$connection_log" ]]; then
        grep -c "ENCRYPTED" "$connection_log" 2>/dev/null || echo "0"
    else
        echo "0"
    fi
}
get_security_violations() {
    local security_log="/var/log/service-mesh/security.log"
    
    if [[ -f "$security_log" ]]; then
        wc -l < "$security_log"
    else
        echo "0"
    fi
}
calculate_security_score() {
    local authenticated="$1"
    local unauthorized="$2"
    
    local total_requests=$((authenticated + unauthorized))
    if [[ $total_requests -gt 0 ]]; then
        local security_percentage=$((authenticated * 100 / total_requests))
        
        if [[ $security_percentage -ge 95 ]]; then
            echo "excellent"
        elif [[ $security_percentage -ge 80 ]]; then
            echo "good"
        elif [[ $security_percentage -ge 60 ]]; then
            echo "fair"
        else
            echo "poor"
        fi
    else
        echo "unknown"
    fi
}

🎯 Real-World Configuration Examples

Complete Service Mesh Configuration

service-mesh-config.tsk
service_mesh_config:
  enabled: true
  discovery: true
  routing: true
  load_balancing: true
  circuit_breaker: true
#service-mesh: enabled
#mesh-enabled: true
#mesh-discovery: true
#mesh-routing: true
#mesh-load-balancing: true
#mesh-circuit-breaker: true
#mesh-observability: true
#mesh-security: true
#mesh-policy: true
#mesh-monitoring: true
#mesh-tracing: true
#mesh-metrics: true
#mesh-config:
 discovery:
   enabled: true
   sources:
     - "docker"
     - "kubernetes"
     - "custom"
   interval: 30
 routing:
   enabled: true
   rules_file: "/etc/service-mesh/routing.conf"
   default_policy: "allow"
 load_balancing:
   enabled: true
   algorithm: "round-robin"
   health_check: true
 circuit_breaker:
   enabled: true
   failure_threshold: 5
   timeout: 60
   half_open_requests: 3
 observability:
   enabled: true
   metrics:
     - "request_count"
     - "response_time"
     - "error_rate"
   tracing: true
   logging: true
 security:
   enabled: true
   authentication: true
   authorization: true
   encryption: true
   mTLS: true
 policy:
   enabled: true
   rules_file: "/etc/service-mesh/policy.conf"
   enforcement: "strict"
 monitoring:
   enabled: true
   interval: 60
   alerts: true

Multi-Service Mesh

multi-service-mesh.tsk
multi_service_mesh:
  meshes:
    - name: frontend-mesh
      discovery: true
      routing: true
    - name: backend-mesh
      discovery: true
      routing: true
    - name: database-mesh
      discovery: true
      routing: false
#mesh-frontend: enabled
#mesh-backend: enabled
#mesh-database: enabled
#mesh-config:
 meshes:
   frontend_mesh:
     discovery: true
     routing: true
     load_balancing: true
     services:
       - "web-ui"
       - "api-gateway"
   backend_mesh:
     discovery: true
     routing: true
     load_balancing: true
     services:
       - "user-service"
       - "order-service"
       - "payment-service"
   database_mesh:
     discovery: true
     routing: false
     load_balancing: false
     services:
       - "user-db"
       - "order-db"

🚨 Troubleshooting Service Mesh

Common Issues and Solutions

1. Service Discovery Issues

Debug service discovery
debug_service_discovery() {
    echo "Debugging service discovery..."
    discover_services
    echo "Service discovery debug completed"
}

2. Routing Issues

Debug routing
debug_routing() {
    local service_name="$1"
    local request_path="$2"
    echo "Debugging routing for $service_name:$request_path"
    route_traffic "$service_name" "$request_path"
}

🔒 Security Best Practices

Service Mesh Security Checklist

Security validation
validate_service_mesh_security() {
    echo "Validating service mesh security configuration..."
    # Check mTLS
    if [[ "${mesh_mtls}" == "true" ]]; then
        echo "✓ mTLS enabled"
    else
        echo "⚠ mTLS not enabled"
    fi
    # Check authentication
    if [[ "${mesh_authentication}" == "true" ]]; then
        echo "✓ Service authentication enabled"
    else
        echo "⚠ Service authentication not enabled"
    fi
    # Check authorization
    if [[ "${mesh_authorization}" == "true" ]]; then
        echo "✓ Service authorization enabled"
    else
        echo "⚠ Service authorization not enabled"
    fi
}

📈 Performance Optimization Tips

Service Mesh Performance Checklist

Performance validation
validate_service_mesh_performance() {
    echo "Validating service mesh performance configuration..."
    # Check discovery interval
    local discovery_interval="${mesh_discovery_interval:-30}" # seconds
    if [[ "$discovery_interval" -ge 10 ]]; then
        echo "✓ Reasonable discovery interval ($discovery_interval s)"
    else
        echo "⚠ Frequent discovery may impact performance ($discovery_interval s)"
    fi
    # Check circuit breaker
    if [[ "${mesh_circuit_breaker}" == "true" ]]; then
        echo "✓ Circuit breaker enabled"
    else
        echo "⚠ Circuit breaker not enabled"
    fi
    # Check observability
    if [[ "${mesh_observability}" == "true" ]]; then
        echo "✓ Observability enabled"
    else
        echo "⚠ Observability not enabled"
    fi
}

🎯 Next Steps

- Service Mesh Optimization: Learn about advanced service mesh optimization - Service Mesh Visualization: Create service mesh visualization dashboards - Service Mesh Correlation: Implement service mesh correlation and alerting - Service Mesh Compliance: Set up service mesh compliance and auditing

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Service mesh transforms your TuskLang configuration into an intelligent, inter-service communication system. It brings modern microservices orchestration to your Bash applications with dynamic discovery, intelligent routing, and comprehensive observability!