amberjs 1.17.0

JavaScript/TypeScript runtime built with Rust and V8
Documentation 
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// Edge Node Manager
// Manages and coordinates edge nodes for distributed JavaScript/TypeScript execution

use anyhow::{Result, anyhow};
use serde::{Deserialize, Serialize};
use std::collections::BTreeMap;
use std::sync::{Arc, Mutex, atomic::Ordering, RwLock};
use tokio::time::{TokioDuration, TokioInstant};
use std::time::{Duration, Instant};
use std::sync::atomic::Ordering;
use std::collections::HashMap;
use std::time::SystemTime;
use std::hash::Hash;

/// Unique identifier for an edge node
#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct NodeId(pub String);
/// Edge node information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EdgeNode {
    pub id: NodeId,
    pub region: String,
    pub endpoint: String,
    pub capacity: NodeCapacity,
    pub status: NodeStatus,
    pub last_heartbeat: std::time::SystemTime,
}
/// Node capacity configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NodeCapacity {
    pub max_concurrent_tasks: u32,
    pub cpu_cores: u32,
    pub memory_mb: u64,
    pub storage_gb: u64,
}
/// Node status
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum NodeStatus {
    Online,
    Offline,
    Busy,
    Degraded,
}
/// Node health information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NodeHealth {
    pub node_id: NodeId,
    pub is_healthy: bool,
    pub cpu_usage: f64,
    pub memory_usage: f64,
    pub active_tasks: u32,
    pub response_time_ms: u64,
}
/// Task to be executed on an edge node
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Task {
    pub id: String,
    pub script: String,
    pub priority: TaskPriority,
    pub timeout_ms: u64,
}
/// Task priority levels
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
pub enum TaskPriority {
    Low,
    Normal,
    High,
    Critical,
}
/// Load balancing strategies
#[derive(Debug, Clone)]
pub enum LoadBalancingStrategy {
    RoundRobin,
    LeastConnections,
    WeightedRoundRobin,
    ResourceBased,
}
/// Node metrics for load balancing
#[derive(Debug, Clone)]
pub struct NodeMetrics {
    pub node_id: NodeId,
    pub active_connections: u32,
    pub cpu_usage: f64,
    pub memory_usage: f64,
    pub task_queue_size: u32,
}
/// Edge Node Manager
#[derive(Debug)]
pub struct EdgeNodeManager {
    nodes: Arc<RwLock<HashMap<NodeId, EdgeNode>>>,
    load_balancer: Arc<EdgeLoadBalancer>,
    health_checker: Arc<HealthChecker>,
}
/// Edge Load Balancer
#[derive(Debug)]
pub struct EdgeLoadBalancer {
    strategy: LoadBalancingStrategy,
    metrics: Arc<RwLock<HashMap<NodeId, NodeMetrics>>>,
}
/// Health Checker
#[derive(Debug)]
pub struct HealthChecker {
    check_interval: Duration,
}
/// Execution result from edge node
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExecutionResult {
    pub task_id: String,
    pub success: bool,
    pub output: Option<String>,
    pub error: Option<String>,
    pub execution_time_ms: u64,
}
impl EdgeNodeManager {
    /// Create a new edge node manager
    pub fn new() -> Self {
        EdgeNodeManager {
            nodes: Arc::new(Mutex::new(HashMap::new()))
            load_balancer: Arc::new(Mutex::new(EdgeLoadBalancer::new(LoadBalancingStrategy::ResourceBased)))
            health_checker: Arc::new(Mutex::new(HealthChecker::new(Duration::from_secs(30)))
        }
    }
    /// Initialize the node manager
    pub async fn initialize(&self) -> Result<()> {
        println!("Initializing Edge Node Manager...");
        Ok(())
    }
    /// Register a new edge node
    pub async fn register_node(&self, mut node: EdgeNode) -> Result<NodeId> {
        // Generate unique ID if not provided
        if node.id.0.is_empty() {
            node.id = NodeId(format!("edge-node-{}", uuid::Uuid::new_v4());
        }
        node.last_heartbeat = std::time::SystemTime::now();
        let mut nodes = self.nodes.write().await;
        nodes.insert(node.id.clone(), node.clone());
        // Initialize metrics for this node
        {
            let mut metrics = self.load_balancer.metrics.write().await;
            metrics.insert(node.id.clone(), NodeMetrics {
                node_id: node.id.clone(),
                active_connections: 0,
                cpu_usage: 0.0,
                memory_usage: 0.0,
                task_queue_size: 0,
            });
        }
        println!("Registered edge node: {} in region {}", node.id.0, node.region);
        Ok(node.id)
    }
    /// Discover available nodes
    pub async fn discover_nodes(&self) -> Result<Vec<EdgeNode> {
        let nodes: _ = self.nodes.read().await;
        let available_nodes: Vec<EdgeNode> = nodes
            .values()
            .filter(|node| node.status == NodeStatus::Online)
            .cloned()
            .collect();
        println!("Discovered {} available nodes", available_nodes.len());
        Ok(available_nodes)
    }
    /// Perform health check on a specific node
    pub async fn health_check(&self, node_id: &NodeId) -> Result<NodeHealth> {
        let nodes: _ = self.nodes.read().await;
        let node: _ = nodes.get(node_id)
            .ok_or_else(|| anyhow!("Node not found: {}", node_id.0))?;
        // Simulate health check
        let start: _ = Instant::now();
        tokio::time::sleep(Duration::from_millis(10)).await;
        let metrics: _ = self.load_balancer.metrics.read().await;
        let node_metrics: _ = metrics.get(node_id);
        let health: _ = NodeHealth {
            node_id: node_id.clone(),
            is_healthy: node.status == NodeStatus::Online,
            cpu_usage: node_metrics.map(|m| m.cpu_usage).unwrap_or(0.0),
            memory_usage: node_metrics.map(|m| m.memory_usage).unwrap_or(0.0),
            active_tasks: node_metrics.map(|m| m.active_connections).unwrap_or(0),
            response_time_ms: start.elapsed().as_millis() as u64,
        };
        Ok(health)
    }
    /// Execute a task on an edge node
    pub async fn execute_task(&self, task: Task) -> Result<ExecutionResult> {
        // Select optimal node
        let node_id: _ = self.load_balancer.select_node(&task).await?;
        println!("Executing task {} on node {}", task.id, node_id.0);
        // Simulate task execution
        let start: _ = Instant::now();
        tokio::time::sleep(Duration::from_millis(task.timeout_ms.min(100)).await;
        let execution_time: _ = start.elapsed().as_millis() as u64;
        let result: _ = ExecutionResult {
            task_id: task.id,
            success: true,
            output: Some("Task completed successfully".to_string()),
            error: None,
            execution_time_ms: execution_time,
        };
        Ok(result)
    }
    /// Remove a node from the manager
    pub async fn unregister_node(&self, node_id: &NodeId) -> Result<()> {
        let mut nodes = self.nodes.write().await;
        nodes.remove(node_id);
        let mut metrics = self.load_balancer.metrics.write().await;
        metrics.remove(node_id);
        println!("Unregistered node: {}", node_id.0);
        Ok(())
    }
    /// Get the total number of registered nodes
    pub async fn node_count(&self) -> usize {
        let nodes: _ = self.nodes.read().await;
        nodes.len()
    }
    /// Get online node count
    pub async fn online_node_count(&self) -> usize {
        let nodes: _ = self.nodes.read().await;
        nodes.values().filter(|n| n.status == NodeStatus::Online).count()
    }
}
impl EdgeLoadBalancer {
    /// Create a new load balancer
    pub fn new(strategy: LoadBalancingStrategy) -> Self {
        EdgeLoadBalancer {
            strategy,
            metrics: Arc::new(Mutex::new(HashMap::new()))
        }
    }
    /// Select the optimal node for a task
    pub async fn select_node(&self, task: &Task) -> Result<NodeId> {
        let metrics: _ = self.metrics.read().await;
        match self.strategy {
            LoadBalancingStrategy::RoundRobin => {
                // Simple round-robin: select first available node
                if let Some((node_id, _)) = metrics.iter().find(|(_, m)| m.active_connections == 0) {
                    Ok(node_id.clone())
                } else {
                    Err(anyhow!("No available nodes"))
                }
            }
            LoadBalancingStrategy::LeastConnections => {
                // Select node with least connections
                metrics
                    .iter()
                    .min_by_key(|(_, m)| m.active_connections)
                    .map(|(node_id, _)| node_id.clone())
                    .ok_or_else(|| anyhow!("No available nodes"))
            }
            LoadBalancingStrategy::ResourceBased => {
                // Select node with best resource availability (highest score)
                metrics
                    .iter()
                    .max_by(|a, b| {
                        let score_a: _ = (100.0 - a.1.cpu_usage) * 0.5 + (100.0 - a.1.memory_usage) * 0.5;
                        let score_b: _ = (100.0 - b.1.cpu_usage) * 0.5 + (100.0 - b.1.memory_usage) * 0.5;
                        score_a.partial_cmp(&score_b).unwrap_or(std::cmp::Ordering::Equal)
                    })
                    .map(|(node_id, _)| node_id.clone())
                    .ok_or_else(|| anyhow!("No available nodes"))
            }
            _ => Err(anyhow!("Unsupported load balancing strategy")),
        }
    }
    /// Rebalance the load across nodes
    pub async fn rebalance(&self) -> Result<()> {
        println!("Rebalancing load across nodes...");
        Ok(())
    }
    /// Update node metrics
    pub async fn update_metrics(&self, node_id: &NodeId, metrics: NodeMetrics) {
        let mut metrics_map = self.metrics.write().await;
        metrics_map.insert(node_id.clone(), metrics);
    }
}
impl HealthChecker {
    /// Create a new health checker
    pub fn new(check_interval: Duration) -> Self {
        HealthChecker { check_interval }
    }
    /// Start periodic health checks
    pub async fn start_checks(&self, _manager: &EdgeNodeManager) {
        println!("Starting periodic health checks (interval: {:?})", self.check_interval);
    }
}
// Default implementations
impl Default for EdgeNodeManager {
    fn default() -> Self {
        Self::new()
    }
}