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//! Node discovery implementations for cluster management
//!
//! This module provides various methods for discovering nodes in the cluster,
//! including static configuration, multicast discovery, DNS service discovery,
//! and Consul-based discovery.
use crate::error::{CoreError, CoreResult, ErrorContext};
use std::net::{IpAddr, SocketAddr};
use std::time::{Duration, Instant};
use super::types::{
NodeCapabilities, NodeDiscoveryMethod, NodeInfo, NodeMetadata, NodeStatus, NodeType,
};
/// Node discovery implementation
pub struct NodeDiscovery;
impl NodeDiscovery {
/// Discover nodes using a specific discovery method
pub fn discover_nodes(method: &NodeDiscoveryMethod) -> CoreResult<Vec<NodeInfo>> {
match method {
NodeDiscoveryMethod::Static(addresses) => Self::discover_static_nodes(addresses),
NodeDiscoveryMethod::Multicast { group, port } => {
Self::discover_multicast_nodes(group, *port)
}
NodeDiscoveryMethod::DnsService { service_name } => {
Self::discover_dns_service_nodes(service_name)
}
NodeDiscoveryMethod::Consul { endpoint } => Self::discover_consul_nodes(endpoint),
}
}
/// Discover nodes from static address list
fn discover_static_nodes(addresses: &[SocketAddr]) -> CoreResult<Vec<NodeInfo>> {
let mut nodes = Vec::new();
for address in addresses {
if Self::is_node_reachable(*address)? {
nodes.push(NodeInfo {
id: format!("node_{address}"),
address: *address,
node_type: NodeType::Worker,
capabilities: NodeCapabilities::default(),
status: NodeStatus::Unknown,
last_seen: Instant::now(),
metadata: NodeMetadata::default(),
});
}
}
Ok(nodes)
}
/// Discover nodes via multicast
fn discover_multicast_nodes(group: &IpAddr, port: u16) -> CoreResult<Vec<NodeInfo>> {
use std::net::{SocketAddr, UdpSocket};
use std::time::Duration;
let mut discovered_nodes = Vec::new();
// Create a UDP socket for multicast discovery
let socket = UdpSocket::bind(SocketAddr::new(*group, port)).map_err(|e| {
CoreError::IoError(crate::error::ErrorContext::new(format!(
"Failed to bind multicast socket: {e}"
)))
})?;
// Set socket timeout for non-blocking operation
socket
.set_read_timeout(Some(Duration::from_secs(5)))
.map_err(|e| {
CoreError::IoError(crate::error::ErrorContext::new(format!(
"Failed to set socket timeout: {e}"
)))
})?;
// Send discovery broadcast
let discovery_message = b"SCIRS2_NODE_DISCOVERY";
let broadcast_addr = SocketAddr::new(*group, port);
match socket.send_to(discovery_message, broadcast_addr) {
Ok(_) => {
// Listen for responses
let mut buffer = [0u8; 1024];
let start_time = std::time::Instant::now();
while start_time.elapsed() < Duration::from_secs(3) {
match socket.recv_from(&mut buffer) {
Ok((size, addr)) => {
let response = String::from_utf8_lossy(&buffer[..size]);
if response.starts_with("SCIRS2_NODE_RESPONSE") {
// Parse node information from response
let parts: Vec<&str> = response.split(':').collect();
if parts.len() >= 3 {
let nodeid = parts[1usize].to_string();
let node_type = match parts[2usize] {
"master" => NodeType::Master,
"worker" => NodeType::Worker,
"storage" => NodeType::Storage,
"compute" => NodeType::Compute,
_ => NodeType::Worker,
};
discovered_nodes.push(NodeInfo {
id: nodeid,
address: addr,
node_type,
capabilities: NodeCapabilities::default(),
status: NodeStatus::Unknown,
last_seen: Instant::now(),
metadata: NodeMetadata::default(),
});
}
}
}
Err(_) => break, // Timeout or error, exit loop
}
}
}
Err(e) => {
return Err(CoreError::IoError(crate::error::ErrorContext::new(
format!("Failed to send discovery broadcast: {e}"),
)));
}
}
Ok(discovered_nodes)
}
/// Discover nodes via DNS service discovery
fn discover_dns_service_nodes(service_name: &str) -> CoreResult<Vec<NodeInfo>> {
// DNS-SD discovery implementation
// This would typically use DNS SRV records to discover services
#[allow(unused_mut)]
let mut discovered_nodes = Vec::new();
#[cfg(target_os = "linux")]
{
use std::process::Command;
use std::str;
// Try to use avahi-browse for DNS-SD discovery on Linux
match Command::new("avahi-browse")
.arg("-t") // Terminate after cache is exhausted
.arg("-r") // Resolve found services
.arg("-p") // Parseable output
.arg(service_name)
.output()
{
Ok(output) => {
let output_str = str::from_utf8(&output.stdout).map_err(|e| {
CoreError::ValidationError(ErrorContext::new(format!(
"Failed to parse avahi output: {e}"
)))
})?;
// Parse avahi-browse output format
for line in output_str.lines() {
let parts: Vec<&str> = line.split(';').collect();
if parts.len() >= 9 && parts[0usize] == "=" {
// Format: =;interface;protocol;name;type;domain;hostname;address;port;txt
let hostname = parts[6usize];
let address_str = parts[7usize];
let port_str = parts[8usize];
if let Ok(port) = port_str.parse::<u16>() {
// Try to parse IP address
if let Ok(ip) = address_str.parse::<IpAddr>() {
let socket_addr = SocketAddr::new(ip, port);
let nodeid = format!("dns_{hostname}_{port}");
discovered_nodes.push(NodeInfo {
id: nodeid,
address: socket_addr,
node_type: NodeType::Worker,
capabilities: NodeCapabilities::default(),
status: NodeStatus::Unknown,
last_seen: Instant::now(),
metadata: NodeMetadata {
hostname: hostname.to_string(),
operating_system: "unknown".to_string(),
kernel_version: "unknown".to_string(),
container_runtime: None,
labels: std::collections::HashMap::new(),
},
});
}
}
}
}
}
Err(_) => {
// avahi-browse not available, try nslookup for basic SRV record resolution
match Command::new("nslookup")
.arg("-type=SRV")
.arg(service_name)
.output()
{
Ok(output) => {
let output_str = str::from_utf8(&output.stdout).map_err(|e| {
CoreError::ValidationError(ErrorContext::new(format!(
"Failed to parse nslookup output: {e}"
)))
})?;
// Parse SRV records (simplified)
for line in output_str.lines() {
if line.contains("service =") {
// Extract port and hostname from SRV record
let parts: Vec<&str> = line.split_whitespace().collect();
if parts.len() >= 4 {
if let Ok(port) = parts[2usize].parse::<u16>() {
let hostname = parts[3usize].trim_end_matches('.');
let nodeid = format!("srv_{hostname}_{port}");
// Try to resolve hostname to IP
if let Ok(mut addrs) =
std::net::ToSocketAddrs::to_socket_addrs(&format!(
"{hostname}:{port}"
))
{
if let Some(addr) = addrs.next() {
discovered_nodes.push(NodeInfo {
id: nodeid,
address: addr,
node_type: NodeType::Worker,
capabilities: NodeCapabilities::default(),
status: NodeStatus::Unknown,
last_seen: Instant::now(),
metadata: NodeMetadata {
hostname: hostname.to_string(),
operating_system: "unknown".to_string(),
kernel_version: "unknown".to_string(),
container_runtime: None,
labels: std::collections::HashMap::new(
),
},
});
}
}
}
}
}
}
}
Err(_) => {
// Both avahi-browse and nslookup failed, return empty list
}
}
}
}
}
#[cfg(target_os = "windows")]
{
use std::process::Command;
use std::str;
// On Windows, try to use dns-sd command if available
match Command::new("dns-sd")
.arg("-B") // Browse for services
.arg(service_name)
.output()
{
Ok(output) => {
let output_str = str::from_utf8(&output.stdout).map_err(|e| {
CoreError::ValidationError(ErrorContext::new(format!(
"Failed to parse dns-sd output: {e}"
)))
})?;
// Parse dns-sd output (simplified implementation)
for line in output_str.lines() {
if line.contains(service_name) {
// Extract service information
// This is a simplified parser - real implementation would be more robust
let parts: Vec<&str> = line.split_whitespace().collect();
if parts.len() >= 2 {
let service_instance = parts[1usize];
let nodeid = format!("dnssd_{service_instance}");
// For now, use a default port and localhost
// Real implementation would resolve the service
let socket_addr = SocketAddr::new(
IpAddr::V4(std::net::Ipv4Addr::new(127, 0, 0, 1)),
8080,
);
discovered_nodes.push(NodeInfo {
id: nodeid,
address: socket_addr,
node_type: NodeType::Worker,
capabilities: NodeCapabilities::default(),
status: NodeStatus::Unknown,
last_seen: Instant::now(),
metadata: NodeMetadata::default(),
});
}
}
}
}
Err(_) => {
// dns-sd not available
}
}
}
Ok(discovered_nodes)
}
/// Discover nodes via Consul service registry
fn discover_consul_nodes(endpoint: &str) -> CoreResult<Vec<NodeInfo>> {
// Consul discovery implementation via HTTP API
use std::process::Command;
use std::str;
let mut discovered_nodes = Vec::new();
// Try to query Consul catalog API for services
let consul_url = if endpoint.starts_with("http") {
format!("{endpoint}/v1/catalog/services")
} else {
format!("http://{endpoint}/v1/catalog/services")
};
// Use curl to query Consul API (most portable approach)
match Command::new("curl")
.arg("-s") // Silent mode
.arg("-f") // Fail silently on HTTP errors
.arg("--connect-timeout")
.arg("5") // 5 second timeout
.arg(&consul_url)
.output()
{
Ok(output) => {
if output.status.success() {
let json_str = str::from_utf8(&output.stdout).map_err(|e| {
CoreError::ValidationError(ErrorContext::new(format!(
"Failed to parse Consul response: {e}"
)))
})?;
// Parse JSON response (simplified - would use serde_json in real implementation)
// Looking for service names in the format: {"service_name": ["tag1", "tag2"]}
if json_str.trim().starts_with('{') {
// Extract service names from JSON
let cleaned = json_str.replace(['{', '}'], "");
for service_entry in cleaned.split(',') {
let service_parts: Vec<&str> = service_entry.split(':').collect();
if service_parts.len() >= 2 {
let service_name = service_parts[0usize].trim().trim_matches('"');
// Query specific service details
let service_url = if endpoint.starts_with("http") {
format!("{endpoint}/v1/catalog/service/{service_name}")
} else {
format!("http://{endpoint}/v1/catalog/service/{service_name}")
};
match Command::new("curl")
.arg("-s")
.arg("-f")
.arg("--connect-timeout")
.arg("3")
.arg(&service_url)
.output()
{
Ok(service_output) => {
if service_output.status.success() {
let service_json =
str::from_utf8(&service_output.stdout)
.unwrap_or("");
// Simple JSON parsing to extract Address and ServicePort
// In real implementation, would use proper JSON parsing
if service_json.contains("\"Address\"")
&& service_json.contains("\"ServicePort\"")
{
// Extract address and port (very simplified)
let lines: Vec<&str> =
service_json.lines().collect();
let mut address_str = "";
let mut port_str = "";
for line in lines {
if line.contains("\"Address\"") {
if let Some(addr_part) =
line.split(':').nth(1)
{
address_str = addr_part
.trim()
.trim_matches('"')
.trim_matches(',');
}
}
if line.contains("\"ServicePort\"") {
if let Some(port_part) =
line.split(':').nth(1)
{
port_str =
port_part.trim().trim_matches(',');
}
}
}
// Create node info if we have both address and port
if !address_str.is_empty() && !port_str.is_empty() {
if let (Ok(ip), Ok(port)) = (
address_str.parse::<IpAddr>(),
port_str.parse::<u16>(),
) {
let socket_addr = SocketAddr::new(ip, port);
let nodeid = format!(
"consul_{service_name}_{address_str}"
);
discovered_nodes.push(NodeInfo {
id: nodeid,
address: socket_addr,
node_type: NodeType::Worker,
capabilities: NodeCapabilities::default(),
status: NodeStatus::Unknown,
last_seen: Instant::now(),
metadata: NodeMetadata {
hostname: address_str.to_string(),
operating_system: "unknown".to_string(),
kernel_version: "unknown".to_string(),
container_runtime: Some("consul".to_string()),
labels: {
let mut labels = std::collections::HashMap::new();
labels.insert("service".to_string(), service_name.to_string());
labels.insert("discovery".to_string(), "consul".to_string());
labels
},
},
});
}
}
}
}
}
Err(_) => continue, // Skip this service if query fails
}
}
}
}
} else {
return Err(CoreError::IoError(ErrorContext::new(format!(
"Failed to connect to Consul at {endpoint}"
))));
}
}
Err(_) => {
return Err(CoreError::InvalidState(ErrorContext::new(
"curl command not available for Consul discovery",
)));
}
}
Ok(discovered_nodes)
}
/// Check if a node is reachable
fn is_node_reachable(address: SocketAddr) -> CoreResult<bool> {
// Simple reachability check
// In a real implementation, this would do proper health checking
Ok(true) // Placeholder
}
}