Serverless Functions in TuskLang - Bash Guide

⚡ Revolutionary Serverless Functions Configuration

Serverless functions in TuskLang transform your configuration files into intelligent, event-driven function systems. No more server management or infrastructure concerns—everything lives in your TuskLang configuration with dynamic function execution, intelligent scaling, and comprehensive function monitoring.

> "We don't bow to any king" – TuskLang serverless functions break free from traditional server constraints and bring modern function-as-a-service capabilities to your Bash applications.

🚀 Core Serverless Functions Directives

Basic Serverless Functions Setup

#serverless-functions: enabled           # Enable serverless functions
#sl-enabled: true                       # Alternative syntax
#sl-runtime: bash                       # Function runtime
#sl-memory: 128                         # Memory limit (MB)
#sl-timeout: 30                         # Timeout (seconds)
#sl-concurrency: 10                     # Concurrent executions

Advanced Serverless Functions Configuration

#sl-triggers: true                      # Enable function triggers
#sl-scaling: true                       # Enable auto-scaling
#sl-monitoring: true                    # Enable function monitoring
#sl-logging: true                       # Enable function logging
#sl-security: true                      # Enable function security
#sl-cold-start: true                    # Enable cold start optimization

🔧 Bash Serverless Functions Implementation

Basic Serverless Function Manager

#!/bin/bash
Load serverless functions configuration
source <(tsk load serverless-functions.tsk)
Serverless functions configuration
SL_ENABLED="${sl_enabled:-true}"
SL_RUNTIME="${sl_runtime:-bash}"
SL_MEMORY="${sl_memory:-128}"
SL_TIMEOUT="${sl_timeout:-30}"
SL_CONCURRENCY="${sl_concurrency:-10}"
Serverless function manager
class ServerlessFunctionManager {
    constructor() {
        this.enabled = SL_ENABLED
        this.runtime = SL_RUNTIME
        this.memory = SL_MEMORY
        this.timeout = SL_TIMEOUT
        this.concurrency = SL_CONCURRENCY
        this.functions = new Map()
        this.executions = new Map()
        this.stats = {
            functions_registered: 0,
            executions_started: 0,
            executions_completed: 0,
            executions_failed: 0
        }
    }
    
    registerFunction(name, handler, options = {}) {
        if (!this.enabled) return
        
        this.functions.set(name, {
            name,
            handler,
            runtime: this.runtime,
            memory: options.memory || this.memory,
            timeout: options.timeout || this.timeout,
            concurrency: options.concurrency || this.concurrency,
            ...options
        })
        
        this.stats.functions_registered++
    }
    
    invokeFunction(name, event, context = {}) {
        if (!this.enabled) return null
        
        const functionConfig = this.functions.get(name)
        if (!functionConfig) {
            throw new Error(Function not found: ${name})
        }
        
        this.stats.executions_started++
        
        // Check concurrency limit
        if (this.getActiveExecutions(name) >= functionConfig.concurrency) {
            throw new Error(Concurrency limit exceeded for function: ${name})
        }
        
        // Execute function
        const executionId = this.startExecution(name, event, context)
        const result = this.executeFunction(functionConfig, event, context)
        
        this.endExecution(executionId, result)
        
        if (result.success) {
            this.stats.executions_completed++
        } else {
            this.stats.executions_failed++
        }
        
        return result
    }
    
    getActiveExecutions(functionName) {
        let count = 0
        for (const [id, execution] of this.executions) {
            if (execution.functionName === functionName && execution.status === 'running') {
                count++
            }
        }
        return count
    }
    
    startExecution(functionName, event, context) {
        const executionId = Date.now().toString()
        this.executions.set(executionId, {
            id: executionId,
            functionName,
            event,
            context,
            startTime: Date.now(),
            status: 'running'
        })
        return executionId
    }
    
    endExecution(executionId, result) {
        const execution = this.executions.get(executionId)
        if (execution) {
            execution.endTime = Date.now()
            execution.duration = execution.endTime - execution.startTime
            execution.status = result.success ? 'completed' : 'failed'
            execution.result = result
        }
    }
    
    executeFunction(functionConfig, event, context) {
        // Implementation for function execution
        return { success: true, data: 'function result' }
    }
    
    getStats() {
        return { ...this.stats }
    }
}
Initialize serverless function manager
const serverlessManager = new ServerlessFunctionManager()

Dynamic Function Registration

#!/bin/bash
Dynamic function registration
register_function() {
    local function_name="$1"
    local handler_script="$2"
    local memory="${3:-128}"
    local timeout="${4:-30}"
    local concurrency="${5:-10}"
    
    # Create function configuration
    local function_dir="/tmp/serverless_functions/$function_name"
    mkdir -p "$function_dir"
    
    # Copy handler script
    cp "$handler_script" "$function_dir/handler.sh"
    chmod +x "$function_dir/handler.sh"
    
    # Create function config
    cat > "$function_dir/config.json" << EOF
{
    "name": "$function_name",
    "handler": "handler.sh",
    "runtime": "bash",
    "memory": $memory,
    "timeout": $timeout,
    "concurrency": $concurrency,
    "registered_at": "$(date -Iseconds)"
}
EOF
    
    echo "✓ Function registered: $function_name"
}
list_functions() {
    local functions_dir="/tmp/serverless_functions"
    
    if [[ -d "$functions_dir" ]]; then
        echo "Registered Functions:"
        echo "===================="
        for function_dir in "$functions_dir"/*; do
            if [[ -d "$function_dir" ]]; then
                local function_name=$(basename "$function_dir")
                local config_file="$function_dir/config.json"
                
                if [[ -f "$config_file" ]]; then
                    local memory=$(jq -r '.memory' "$config_file" 2>/dev/null)
                    local timeout=$(jq -r '.timeout' "$config_file" 2>/dev/null)
                    local concurrency=$(jq -r '.concurrency' "$config_file" 2>/dev/null)
                    
                    printf "%-20s | Memory: %-4sMB | Timeout: %-2ss | Concurrency: %-2s\n" \
                        "$function_name" "$memory" "$timeout" "$concurrency"
                fi
            fi
        done
    else
        echo "No functions registered"
    fi
}
delete_function() {
    local function_name="$1"
    local function_dir="/tmp/serverless_functions/$function_name"
    
    if [[ -d "$function_dir" ]]; then
        rm -rf "$function_dir"
        echo "✓ Function deleted: $function_name"
    else
        echo "Function not found: $function_name"
    fi
}

Function Execution and Invocation

#!/bin/bash
Function execution and invocation
invoke_function() {
    local function_name="$1"
    local event_data="${2:-}"
    local timeout="${3:-30}"
    
    # Get function configuration
    local function_dir="/tmp/serverless_functions/$function_name"
    local config_file="$function_dir/config.json"
    local handler_script="$function_dir/handler.sh"
    
    if [[ ! -f "$config_file" ]] || [[ ! -f "$handler_script" ]]; then
        echo "Function not found: $function_name"
        return 1
    fi
    
    # Extract configuration
    local memory=$(jq -r '.memory' "$config_file" 2>/dev/null)
    local function_timeout=$(jq -r '.timeout' "$config_file" 2>/dev/null)
    local concurrency=$(jq -r '.concurrency' "$config_file" 2>/dev/null)
    
    # Check concurrency limit
    local active_executions=$(get_active_executions "$function_name")
    if [[ $active_executions -ge $concurrency ]]; then
        echo "Concurrency limit exceeded for function: $function_name"
        return 1
    fi
    
    # Create execution environment
    local execution_id=$(uuidgen)
    local execution_dir="/tmp/serverless_executions/$execution_id"
    mkdir -p "$execution_dir"
    
    # Prepare event data
    local event_file="$execution_dir/event.json"
    cat > "$event_file" << EOF
{
    "function_name": "$function_name",
    "event_data": "$event_data",
    "execution_id": "$execution_id",
    "timestamp": "$(date -Iseconds)"
}
EOF
    
    # Execute function with timeout
    local start_time=$(date +%s)
    local result_file="$execution_dir/result.json"
    
    timeout "$function_timeout" bash -c "
        cd '$execution_dir'
        export FUNCTION_NAME='$function_name'
        export EXECUTION_ID='$execution_id'
        export EVENT_FILE='$event_file'
        export RESULT_FILE='$result_file'
        bash '$handler_script' '$event_data'
    " > "$execution_dir/stdout.log" 2> "$execution_dir/stderr.log"
    
    local exit_code=$?
    local end_time=$(date +%s)
    local duration=$((end_time - start_time))
    
    # Record execution result
    local success=false
    local output=""
    
    if [[ $exit_code -eq 0 ]] && [[ -f "$result_file" ]]; then
        success=true
        output=$(cat "$result_file")
    else
        output=$(cat "$execution_dir/stderr.log")
    fi
    
    # Log execution
    log_function_execution "$function_name" "$execution_id" "$success" "$duration" "$exit_code"
    
    # Cleanup
    rm -rf "$execution_dir"
    
    if [[ "$success" == "true" ]]; then
        echo "$output"
        return 0
    else
        echo "Function execution failed: $output"
        return 1
    fi
}
get_active_executions() {
    local function_name="$1"
    local executions_dir="/tmp/serverless_executions"
    local count=0
    
    if [[ -d "$executions_dir" ]]; then
        for execution_dir in "$executions_dir"/*; do
            if [[ -d "$execution_dir" ]]; then
                local event_file="$execution_dir/event.json"
                if [[ -f "$event_file" ]]; then
                    local exec_function_name=$(jq -r '.function_name' "$event_file" 2>/dev/null)
                    if [[ "$exec_function_name" == "$function_name" ]]; then
                        count=$((count + 1))
                    fi
                fi
            fi
        done
    fi
    
    echo "$count"
}
log_function_execution() {
    local function_name="$1"
    local execution_id="$2"
    local success="$3"
    local duration="$4"
    local exit_code="$5"
    local execution_log="/var/log/serverless/executions.log"
    
    echo "$(date '+%Y-%m-%d %H:%M:%S') | $function_name | $execution_id | $success | ${duration}s | $exit_code" >> "$execution_log"
}

Function Triggers and Events

#!/bin/bash
Function triggers and events
setup_function_trigger() {
    local function_name="$1"
    local trigger_type="$2"
    local trigger_config="$3"
    
    case "$trigger_type" in
        "http")
            setup_http_trigger "$function_name" "$trigger_config"
            ;;
        "cron")
            setup_cron_trigger "$function_name" "$trigger_config"
            ;;
        "event")
            setup_event_trigger "$function_name" "$trigger_config"
            ;;
        "queue")
            setup_queue_trigger "$function_name" "$trigger_config"
            ;;
        *)
            echo "Unknown trigger type: $trigger_type"
            return 1
            ;;
    esac
}
setup_http_trigger() {
    local function_name="$1"
    local config="$2"
    local port="${3:-8080}"
    local endpoint="/invoke/$function_name"
    
    # Create HTTP trigger configuration
    local trigger_file="/tmp/serverless_triggers/http_${function_name}.json"
    cat > "$trigger_file" << EOF
{
    "type": "http",
    "function": "$function_name",
    "port": $port,
    "endpoint": "$endpoint",
    "config": "$config"
}
EOF
    
    echo "✓ HTTP trigger setup for function: $function_name"
}
setup_cron_trigger() {
    local function_name="$1"
    local cron_expression="$2"
    
    # Create cron trigger configuration
    local trigger_file="/tmp/serverless_triggers/cron_${function_name}.json"
    cat > "$trigger_file" << EOF
{
    "type": "cron",
    "function": "$function_name",
    "expression": "$cron_expression"
}
EOF
    
    # Add to crontab
    (crontab -l 2>/dev/null; echo "$cron_expression invoke_function '$function_name'") | crontab -
    
    echo "✓ Cron trigger setup for function: $function_name"
}
setup_event_trigger() {
    local function_name="$1"
    local event_topic="$2"
    
    # Create event trigger configuration
    local trigger_file="/tmp/serverless_triggers/event_${function_name}.json"
    cat > "$trigger_file" << EOF
{
    "type": "event",
    "function": "$function_name",
    "topic": "$event_topic"
}
EOF
    
    # Subscribe to event topic
    subscribe_to_topic "$event_topic" "/tmp/serverless_triggers/event_handler.sh"
    
    echo "✓ Event trigger setup for function: $function_name"
}
setup_queue_trigger() {
    local function_name="$1"
    local queue_name="$2"
    
    # Create queue trigger configuration
    local trigger_file="/tmp/serverless_triggers/queue_${function_name}.json"
    cat > "$trigger_file" << EOF
{
    "type": "queue",
    "function": "$function_name",
    "queue": "$queue_name"
}
EOF
    
    # Start queue consumer
    start_queue_consumer "$queue_name" "$function_name"
    
    echo "✓ Queue trigger setup for function: $function_name"
}

Auto-Scaling and Performance

#!/bin/bash
Auto-scaling and performance
monitor_function_performance() {
    local function_name="$1"
    local monitoring_file="/var/log/serverless/monitoring.json"
    
    # Collect function metrics
    local total_executions=$(get_total_executions "$function_name")
    local successful_executions=$(get_successful_executions "$function_name")
    local failed_executions=$(get_failed_executions "$function_name")
    local average_duration=$(get_average_duration "$function_name")
    local active_executions=$(get_active_executions "$function_name")
    
    # Generate monitoring report
    cat > "$monitoring_file" << EOF
{
    "timestamp": "$(date -Iseconds)",
    "function": "$function_name",
    "total_executions": $total_executions,
    "successful_executions": $successful_executions,
    "failed_executions": $failed_executions,
    "success_rate": $(((successful_executions * 100) / total_executions)),
    "average_duration_ms": $average_duration,
    "active_executions": $active_executions
}
EOF
    
    echo "✓ Function performance monitoring completed"
}
get_total_executions() {
    local function_name="$1"
    local execution_log="/var/log/serverless/executions.log"
    
    if [[ -f "$execution_log" ]]; then
        grep -c "$function_name" "$execution_log" 2>/dev/null || echo "0"
    else
        echo "0"
    fi
}
get_successful_executions() {
    local function_name="$1"
    local execution_log="/var/log/serverless/executions.log"
    
    if [[ -f "$execution_log" ]]; then
        grep "$function_name" "$execution_log" | grep -c "true" 2>/dev/null || echo "0"
    else
        echo "0"
    fi
}
get_failed_executions() {
    local function_name="$1"
    local execution_log="/var/log/serverless/executions.log"
    
    if [[ -f "$execution_log" ]]; then
        grep "$function_name" "$execution_log" | grep -c "false" 2>/dev/null || echo "0"
    else
        echo "0"
    fi
}
get_average_duration() {
    local function_name="$1"
    local execution_log="/var/log/serverless/executions.log"
    
    if [[ -f "$execution_log" ]]; then
        local total_duration=0
        local execution_count=0
        
        while IFS='|' read -r timestamp func_name execution_id success duration exit_code; do
            if [[ "$func_name" == "$function_name" ]]; then
                total_duration=$((total_duration + duration))
                execution_count=$((execution_count + 1))
            fi
        done < "$execution_log"
        
        if [[ $execution_count -gt 0 ]]; then
            echo $((total_duration / execution_count))
        else
            echo "0"
        fi
    else
        echo "0"
    fi
}
auto_scale_function() {
    local function_name="$1"
    local current_load="$2"
    local max_instances="${3:-10}"
    
    # Calculate scaling decision
    local target_instances=1
    
    if [[ $current_load -gt 80 ]]; then
        target_instances=$((current_load / 20 + 1))
    elif [[ $current_load -gt 50 ]]; then
        target_instances=$((current_load / 30 + 1))
    fi
    
    # Ensure within bounds
    if [[ $target_instances -gt $max_instances ]]; then
        target_instances=$max_instances
    fi
    
    # Update function concurrency
    update_function_concurrency "$function_name" "$target_instances"
    
    echo "✓ Auto-scaled function $function_name to $target_instances instances"
}
update_function_concurrency() {
    local function_name="$1"
    local concurrency="$2"
    local config_file="/tmp/serverless_functions/$function_name/config.json"
    
    if [[ -f "$config_file" ]]; then
        jq --arg concurrency "$concurrency" '.concurrency = ($concurrency | tonumber)' "$config_file" > "${config_file}.tmp" && mv "${config_file}.tmp" "$config_file"
    fi
}

Cold Start Optimization

#!/bin/bash
Cold start optimization
optimize_cold_start() {
    local function_name="$1"
    local function_dir="/tmp/serverless_functions/$function_name"
    local handler_script="$function_dir/handler.sh"
    
    # Pre-warm function
    pre_warm_function "$function_name"
    
    # Optimize handler script
    optimize_handler_script "$handler_script"
    
    echo "✓ Cold start optimization completed for function: $function_name"
}
pre_warm_function() {
    local function_name="$1"
    
    # Invoke function with minimal payload to warm up
    invoke_function "$function_name" '{"warmup": true}' 5 >/dev/null 2>&1
    
    echo "✓ Function pre-warmed: $function_name"
}
optimize_handler_script() {
    local handler_script="$1"
    
    # Add optimization headers
    local optimized_script="/tmp/optimized_handler.sh"
    cat > "$optimized_script" << 'EOF'
#!/bin/bash
Cold start optimized handler
Pre-load common libraries
source /usr/local/lib/common.sh 2>/dev/null || true
Set performance optimizations
export BASH_ENV=/etc/bash.bashrc
export PATH="/usr/local/bin:/usr/bin:/bin"
Handler function
EOF
    
    # Append original handler content
    cat "$handler_script" >> "$optimized_script"
    
    # Replace original with optimized version
    mv "$optimized_script" "$handler_script"
    chmod +x "$handler_script"
    
    echo "✓ Handler script optimized"
}

🎯 Real-World Configuration Examples

Complete Serverless Functions Configuration

serverless-functions-config.tsk
serverless_functions_config:
  enabled: true
  runtime: bash
  memory: 128
  timeout: 30
  concurrency: 10
#serverless-functions: enabled
#sl-enabled: true
#sl-runtime: bash
#sl-memory: 128
#sl-timeout: 30
#sl-concurrency: 10
#sl-triggers: true
#sl-scaling: true
#sl-monitoring: true
#sl-logging: true
#sl-security: true
#sl-cold-start: true
#sl-config:
 general:
   runtime: bash
   memory: 128
   timeout: 30
   concurrency: 10
 triggers:
   enabled: true
   types:
     - "http"
     - "cron"
     - "event"
     - "queue"
 scaling:
   enabled: true
   auto_scaling: true
   min_instances: 1
   max_instances: 10
   scale_up_threshold: 80
   scale_down_threshold: 20
 monitoring:
   enabled: true
   interval: 60
   metrics:
     - "execution_count"
     - "duration"
     - "error_rate"
     - "cold_starts"
 logging:
   enabled: true
   level: "info"
   retention: "7d"
   rotation: true
 security:
   enabled: true
   isolation: true
   resource_limits: true
   network_policies: true
 cold_start:
   enabled: true
   pre_warming: true
   optimization: true

Multi-Function Architecture

multi-function-architecture.tsk
multi_function_architecture:
  functions:
    - name: user-authentication
      runtime: bash
      memory: 256
      timeout: 60
    - name: data-processing
      runtime: bash
      memory: 512
      timeout: 300
    - name: notification-sender
      runtime: bash
      memory: 128
      timeout: 30
#sl-user-authentication: 256:60
#sl-data-processing: 512:300
#sl-notification-sender: 128:30
#sl-config:
 functions:
   user_authentication:
     runtime: bash
     memory: 256
     timeout: 60
     concurrency: 5
     triggers: ["http", "event"]
   data_processing:
     runtime: bash
     memory: 512
     timeout: 300
     concurrency: 3
     triggers: ["queue", "cron"]
   notification_sender:
     runtime: bash
     memory: 128
     timeout: 30
     concurrency: 10
     triggers: ["event"]

🚨 Troubleshooting Serverless Functions

Common Issues and Solutions

1. Function Execution Issues

Debug function execution
debug_function_execution() {
    local function_name="$1"
    local event_data="${2:-}"
    echo "Debugging function execution for: $function_name"
    invoke_function "$function_name" "$event_data"
}

2. Cold Start Issues

Debug cold start
debug_cold_start() {
    local function_name="$1"
    echo "Debugging cold start for function: $function_name"
    optimize_cold_start "$function_name"
}

🔒 Security Best Practices

Serverless Functions Security Checklist

Security validation
validate_serverless_security() {
    echo "Validating serverless functions security configuration..."
    # Check function isolation
    if [[ "${sl_isolation}" == "true" ]]; then
        echo "✓ Function isolation enabled"
    else
        echo "⚠ Function isolation not enabled"
    fi
    # Check resource limits
    if [[ "${sl_resource_limits}" == "true" ]]; then
        echo "✓ Resource limits enabled"
    else
        echo "⚠ Resource limits not enabled"
    fi
    # Check network policies
    if [[ "${sl_network_policies}" == "true" ]]; then
        echo "✓ Network policies enabled"
    else
        echo "⚠ Network policies not enabled"
    fi
}

📈 Performance Optimization Tips

Serverless Functions Performance Checklist

Performance validation
validate_serverless_performance() {
    echo "Validating serverless functions performance configuration..."
    # Check cold start optimization
    if [[ "${sl_cold_start}" == "true" ]]; then
        echo "✓ Cold start optimization enabled"
    else
        echo "⚠ Cold start optimization not enabled"
    fi
    # Check auto-scaling
    if [[ "${sl_scaling}" == "true" ]]; then
        echo "✓ Auto-scaling enabled"
    else
        echo "⚠ Auto-scaling not enabled"
    fi
    # Check monitoring
    if [[ "${sl_monitoring}" == "true" ]]; then
        echo "✓ Function monitoring enabled"
    else
        echo "⚠ Function monitoring not enabled"
    fi
}

🎯 Next Steps

- Serverless Optimization: Learn about advanced serverless optimization - Serverless Visualization: Create serverless visualization dashboards - Serverless Correlation: Implement serverless correlation and alerting - Serverless Compliance: Set up serverless compliance and auditing

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Serverless functions transform your TuskLang configuration into an intelligent, event-driven function system. It brings modern function-as-a-service capabilities to your Bash applications with dynamic execution, intelligent scaling, and comprehensive function monitoring!