324 lines
8.7 KiB
Rust
324 lines
8.7 KiB
Rust
use std::marker::PhantomData;
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use std::process::Command;
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// ===== Capability Traits =====
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/// Base trait for all capabilities
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pub trait Capability {}
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/// Capability for executing shell commands on a host
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pub trait CommandCapability: Capability {
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fn execute_command(&self, command: &str, args: &[&str]) -> Result<String, String>;
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}
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/// Capability for interacting with a Kubernetes cluster
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pub trait KubernetesCapability: Capability {
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fn apply_manifest(&self, manifest: &str) -> Result<(), String>;
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fn get_resource(&self, resource_type: &str, name: &str) -> Result<String, String>;
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}
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// ===== Topology Traits =====
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/// Base trait for all topologies
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pub trait Topology {
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// Base topology methods that don't depend on capabilities
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fn name(&self) -> &str;
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}
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// ===== Score Traits =====
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/// Generic Score trait with an associated Capability type
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pub trait Score<T: Topology> {
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fn apply(&self, topology: &T) -> Result<(), String>;
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fn name(&self) -> &str;
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}
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// ===== Concrete Topologies =====
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/// A topology representing a Linux host
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pub struct LinuxHostTopology {
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name: String,
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host: String,
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}
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impl LinuxHostTopology {
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pub fn new(name: String, host: String) -> Self {
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Self { name, host }
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}
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}
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impl Topology for LinuxHostTopology {
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fn name(&self) -> &str {
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&self.name
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}
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}
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impl CommandCapability for LinuxHostTopology {
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fn execute_command(&self, command: &str, args: &[&str]) -> Result<String, String> {
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println!("Executing on {}: {} {:?}", self.host, command, args);
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// In a real implementation, this would SSH to the host and execute the command
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let output = Command::new(command)
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.args(args)
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.output()
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.map_err(|e| e.to_string())?;
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if output.status.success() {
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Ok(String::from_utf8_lossy(&output.stdout).to_string())
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} else {
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Err(String::from_utf8_lossy(&output.stderr).to_string())
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}
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}
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}
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/// A topology representing a K3D Kubernetes cluster
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pub struct K3DTopology {
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name: String,
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linux_host: LinuxHostTopology,
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cluster_name: String,
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}
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impl K3DTopology {
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pub fn new(name: String, linux_host: LinuxHostTopology, cluster_name: String) -> Self {
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Self {
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name,
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linux_host,
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cluster_name,
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}
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}
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}
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impl Topology for K3DTopology {
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fn name(&self) -> &str {
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&self.name
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}
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}
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impl CommandCapability for K3DTopology {
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fn execute_command(&self, command: &str, args: &[&str]) -> Result<String, String> {
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// Delegate to the underlying Linux host
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self.linux_host.execute_command(command, args)
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}
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}
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impl KubernetesCapability for K3DTopology {
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fn apply_manifest(&self, manifest: &str) -> Result<(), String> {
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println!("Applying manifest to K3D cluster '{}'", self.cluster_name);
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// Write manifest to a temporary file
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let temp_file = format!("/tmp/manifest-{}.yaml", rand::random::<u32>());
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self.execute_command("bash", &["-c", &format!("cat > {}", temp_file)])?;
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// Apply with kubectl
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self.execute_command(
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"kubectl",
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&["--context", &format!("k3d-{}", self.cluster_name), "apply", "-f", &temp_file]
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)?;
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Ok(())
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}
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fn get_resource(&self, resource_type: &str, name: &str) -> Result<String, String> {
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println!("Getting resource {}/{} from K3D cluster '{}'", resource_type, name, self.cluster_name);
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self.execute_command(
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"kubectl",
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&[
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"--context",
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&format!("k3d-{}", self.cluster_name),
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"get",
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resource_type,
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name,
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"-o",
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"yaml",
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]
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)
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}
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}
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// ===== Concrete Scores =====
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/// A score that executes commands on a topology
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pub struct CommandScore {
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name: String,
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command: String,
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args: Vec<String>,
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}
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impl CommandScore {
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pub fn new(name: String, command: String, args: Vec<String>) -> Self {
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Self { name, command, args }
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}
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}
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impl<T> Score<T> for CommandScore
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where
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T: Topology + CommandCapability
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{
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fn apply(&self, topology: &T) -> Result<(), String> {
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println!("Applying CommandScore '{}' to topology '{}'", self.name, topology.name());
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let args_refs: Vec<&str> = self.args.iter().map(|s| s.as_str()).collect();
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topology.execute_command(&self.command, &args_refs)?;
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Ok(())
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}
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fn name(&self) -> &str {
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&self.name
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}
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}
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/// A score that applies Kubernetes resources to a topology
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pub struct K8sResourceScore {
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name: String,
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manifest: String,
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}
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impl K8sResourceScore {
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pub fn new(name: String, manifest: String) -> Self {
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Self { name, manifest }
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}
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}
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impl<T> Score<T> for K8sResourceScore
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where
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T: Topology + KubernetesCapability
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{
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fn apply(&self, topology: &T) -> Result<(), String> {
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println!("Applying K8sResourceScore '{}' to topology '{}'", self.name, topology.name());
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topology.apply_manifest(&self.manifest)
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}
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fn name(&self) -> &str {
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&self.name
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}
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}
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// ===== Maestro Orchestrator =====
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/// Type-safe orchestrator that enforces capability requirements at compile time
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pub struct Maestro<T: Topology> {
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topology: T,
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scores: Vec<Box<dyn ScoreWrapper<T>>>,
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}
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/// A trait object wrapper that hides the specific Score type but preserves its
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/// capability requirements
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trait ScoreWrapper<T: Topology> {
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fn apply(&self, topology: &T) -> Result<(), String>;
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fn name(&self) -> &str;
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}
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/// Implementation of ScoreWrapper for any Score that works with topology T
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impl<T, S> ScoreWrapper<T> for S
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where
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T: Topology,
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S: Score<T> + 'static
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{
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fn apply(&self, topology: &T) -> Result<(), String> {
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<S as Score<T>>::apply(self, topology)
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}
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fn name(&self) -> &str {
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<S as Score<T>>::name(self)
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}
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}
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impl<T: Topology> Maestro<T> {
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pub fn new(topology: T) -> Self {
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Self {
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topology,
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scores: Vec::new(),
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}
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}
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/// Register a score that is compatible with this topology's capabilities
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pub fn register_score<S>(&mut self, score: S)
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where
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S: Score<T> + 'static
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{
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println!("Registering score '{}' for topology '{}'", score.name(), self.topology.name());
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self.scores.push(Box::new(score));
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}
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/// Apply all registered scores to the topology
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pub fn orchestrate(&self) -> Result<(), String> {
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println!("Orchestrating topology '{}'", self.topology.name());
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for score in &self.scores {
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score.apply(&self.topology)?;
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}
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Ok(())
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}
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}
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// ===== Example Usage =====
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fn main() {
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// Create a Linux host topology
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let linux_host = LinuxHostTopology::new(
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"dev-machine".to_string(),
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"localhost".to_string()
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);
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// Create a maestro for the Linux host
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let mut linux_maestro = Maestro::new(linux_host);
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// Register a command score that works with any topology having CommandCapability
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linux_maestro.register_score(CommandScore::new(
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"check-disk".to_string(),
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"df".to_string(),
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vec!["-h".to_string()]
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));
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// This would fail to compile if we tried to register a K8sResourceScore
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// because LinuxHostTopology doesn't implement KubernetesCapability
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// linux_maestro.register_score(K8sResourceScore::new(...));
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// Create a K3D topology which has both Command and Kubernetes capabilities
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let k3d_host = LinuxHostTopology::new(
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"k3d-host".to_string(),
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"localhost".to_string()
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);
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let k3d_topology = K3DTopology::new(
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"dev-cluster".to_string(),
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k3d_host,
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"devcluster".to_string()
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);
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// Create a maestro for the K3D topology
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let mut k3d_maestro = Maestro::new(k3d_topology);
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// We can register both command scores and kubernetes scores
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k3d_maestro.register_score(CommandScore::new(
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"check-nodes".to_string(),
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"kubectl".to_string(),
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vec!["get".to_string(), "nodes".to_string()]
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));
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k3d_maestro.register_score(K8sResourceScore::new(
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"deploy-nginx".to_string(),
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r#"
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: nginx
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: nginx
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template:
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metadata:
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labels:
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app: nginx
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spec:
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containers:
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- name: nginx
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image: nginx:latest
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ports:
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- containerPort: 80
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"#.to_string()
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));
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// Orchestrate both topologies
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linux_maestro.orchestrate().unwrap();
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k3d_maestro.orchestrate().unwrap();
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}
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