bss-oss-policy-engine 0.3.0

Policy Engine for pricing, eligibility, bundling, and SLA management
Documentation 
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//! Main Policy Engine

use crate::bundling::BundleRule;
use crate::eligibility::EligibilityRule;
use crate::network::NetworkSelectionPolicy;
use crate::sla::SLAPolicy;
use async_trait::async_trait;

/// Policy engine interface
#[async_trait]
pub trait PolicyEngineTrait: Send + Sync {
    /// Evaluate pricing policy
    async fn evaluate_pricing(
        &self,
        policy: &PricingPolicy,
        context: &PricingContext,
    ) -> Result<PricingResult, PolicyError>;

    /// Check eligibility
    async fn check_eligibility(
        &self,
        rule: &EligibilityRule,
        context: &EligibilityContext,
    ) -> Result<bool, PolicyError>;

    /// Evaluate bundle rules
    async fn evaluate_bundle(
        &self,
        rule: &BundleRule,
        context: &BundleContext,
    ) -> Result<BundleResult, PolicyError>;

    /// Get SLA policy
    async fn get_sla(&self, service_type: &str) -> Result<SLAPolicy, PolicyError>;

    /// Select network
    async fn select_network(
        &self,
        policy: &NetworkSelectionPolicy,
        context: &NetworkContext,
    ) -> Result<NetworkSelection, PolicyError>;
}

/// Policy engine implementation
pub struct PolicyEngine {
    // In production, load policies from database or configuration
}

impl PolicyEngine {
    pub fn new() -> Self {
        Self {}
    }
}

#[async_trait]
impl PolicyEngineTrait for PolicyEngine {
    async fn evaluate_pricing(
        &self,
        _policy: &PricingPolicy,
        _context: &PricingContext,
    ) -> Result<PricingResult, PolicyError> {
        // TODO: Implement pricing evaluation
        Err(PolicyError::NotImplemented)
    }

    async fn check_eligibility(
        &self,
        _rule: &EligibilityRule,
        _context: &EligibilityContext,
    ) -> Result<bool, PolicyError> {
        // TODO: Implement eligibility check
        Err(PolicyError::NotImplemented)
    }

    async fn evaluate_bundle(
        &self,
        _rule: &BundleRule,
        _context: &BundleContext,
    ) -> Result<BundleResult, PolicyError> {
        // TODO: Implement bundle evaluation
        Err(PolicyError::NotImplemented)
    }

    async fn get_sla(&self, _service_type: &str) -> Result<SLAPolicy, PolicyError> {
        // TODO: Implement SLA retrieval
        Err(PolicyError::NotImplemented)
    }

    async fn select_network(
        &self,
        _policy: &NetworkSelectionPolicy,
        _context: &NetworkContext,
    ) -> Result<NetworkSelection, PolicyError> {
        // TODO: Implement network selection
        Err(PolicyError::NotImplemented)
    }
}

impl Default for PolicyEngine {
    fn default() -> Self {
        Self::new()
    }
}

// Placeholder types - to be implemented in respective modules
pub struct PricingPolicy;
pub struct PricingContext;
pub struct PricingResult;
pub struct EligibilityContext;
pub struct BundleContext;
pub struct BundleResult;
pub struct NetworkContext;
pub struct NetworkSelection;

/// Policy errors
#[derive(Debug, thiserror::Error)]
pub enum PolicyError {
    #[error("Policy not found")]
    PolicyNotFound,
    #[error("Invalid policy configuration")]
    InvalidConfiguration,
    #[error("Evaluation error: {0}")]
    EvaluationError(String),
    #[error("Not implemented")]
    NotImplemented,
}