oracle_omen_wasm 0.1.0

//! WASM sandbox with fuel and memory limits.

use serde::{Deserialize, Serialize};
use std::time::Duration;

/// WASM sandbox for isolated tool execution
pub struct Sandbox {
    max_fuel: u64,
    max_memory_pages: u32,
    timeout: Duration,
}

impl Sandbox {
    /// Create new sandbox
    pub fn new(max_fuel: u64, max_memory_pages: u32, timeout_ms: u64) -> Self {
        Self {
            max_fuel,
            max_memory_pages,
            timeout: Duration::from_millis(timeout_ms),
        }
    }

    /// Create default sandbox
    pub fn default_limits() -> Self {
        Self {
            max_fuel: 1_000_000,
            max_memory_pages: 16, // 1 MB (64KB per page)
            timeout: Duration::from_secs(5),
        }
    }

    /// Execute a WASM module
    pub fn execute(&self, _wasm_bytes: &[u8], _input: &[u8]) -> SandboxResult<Vec<u8>> {
        // Placeholder for WASM execution
        // Full implementation requires wasmi 0.35 API compatibility
        Ok(Vec::new())
    }
}

/// Sandbox execution result
#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct ExecutionResult {
    /// Output from WASM execution
    pub output: Vec<u8>,

    /// Whether execution succeeded
    pub success: bool,

    /// Fuel consumed during execution
    pub fuel_consumed: u64,

    /// Memory pages used
    pub memory_used_pages: u32,
}

/// Sandbox errors
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum SandboxError {
    /// Module compilation failed
    CompilationFailed(String),

    /// Instantiation failed
    InstantiationFailed(String),

    /// Execution failed
    ExecutionFailed(String),

    /// Memory access failed
    MemoryAccessFailed(String),

    /// Missing required memory export
    MissingMemory,

    /// Missing required export
    MissingExport(String),

    /// Fuel exhausted
    FuelExhausted,

    /// Memory limit exceeded
    MemoryLimitExceeded,

    /// Configuration failed
    ConfigurationFailed(String),

    /// Timeout
    Timeout,
}

impl std::fmt::Display for SandboxError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            SandboxError::CompilationFailed(msg) => write!(f, "Compilation failed: {}", msg),
            SandboxError::InstantiationFailed(msg) => write!(f, "Instantiation failed: {}", msg),
            SandboxError::ExecutionFailed(msg) => write!(f, "Execution failed: {}", msg),
            SandboxError::MemoryAccessFailed(msg) => write!(f, "Memory access failed: {}", msg),
            SandboxError::MissingMemory => write!(f, "Missing required memory export"),
            SandboxError::MissingExport(name) => write!(f, "Missing required export: {}", name),
            SandboxError::FuelExhausted => write!(f, "Fuel exhausted"),
            SandboxError::MemoryLimitExceeded => write!(f, "Memory limit exceeded"),
            SandboxError::ConfigurationFailed(msg) => write!(f, "Configuration failed: {}", msg),
            SandboxError::Timeout => write!(f, "Execution timeout"),
        }
    }
}

impl std::error::Error for SandboxError {}

/// Sandbox result type
pub type SandboxResult<T> = Result<T, SandboxError>;

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_sandbox_creation() {
        let sandbox = Sandbox::new(1000, 8, 1000);
        assert_eq!(sandbox.max_fuel, 1000);
        assert_eq!(sandbox.max_memory_pages, 8);
    }

    #[test]
    fn test_default_limits() {
        let sandbox = Sandbox::default_limits();
        assert_eq!(sandbox.max_fuel, 1_000_000);
        assert_eq!(sandbox.max_memory_pages, 16);
    }
}