🛑 Error Handling - TuskLang for C# - "Fail Gracefully"

Build resilient C# TuskLang systems that never crash unexpectedly!

Error handling is critical for reliability and user trust. This guide covers exception handling, configuration errors, logging, recovery, and best practices for TuskLang in C# environments.

🛡️ Error Handling Philosophy

"We Don't Bow to Any King"

- Fail gracefully - Never crash, always recover - Log everything - Every error is a learning opportunity - Surface clearly - Make errors actionable - Recover automatically - Self-healing systems - Test error paths - Don’t just test the happy path

⚠️ Exception Handling

C# Exception Handling Patterns

- try/catch/finally: Standard error handling - Custom exceptions: Domain-specific errors - Global error handlers: Centralized error management

Example: Handling TuskLang Parse Errors

// ErrorHandlingExample.cs
try
{
    var config = TuskLang.Parse("invalid config");
}
catch (ConfigSyntaxException ex)
{
    Console.Error.WriteLine($"Config syntax error: {ex.Message}");
}
catch (Exception ex)
{
    Console.Error.WriteLine($"Unexpected error: {ex.Message}");
}

📝 Configuration Error Handling

Example: Validating and Reporting Config Errors

// ConfigValidation.cs
public void ValidateConfig(string config)
{
    try
    {
        TuskLang.Parse(config);
    }
    catch (ConfigSyntaxException ex)
    {
        LogError($"Config error: {ex.Message}");
        throw;
    }
}

🪵 Logging Errors

Example: Logging with Serilog

// LoggingErrors.cs
using Serilog;
public class ErrorLogger
{
    private readonly ILogger _logger;
    public ErrorLogger(ILogger logger) => _logger = logger;
    public void LogError(string message, Exception ex) => _logger.Error(ex, message);
}

🔄 Recovery Strategies

- Retry logic: Automatic retries for transient errors - Fallbacks: Use defaults or cached values - Circuit breakers: Prevent cascading failures - Graceful degradation: Reduce functionality, not availability

Example: Retry with Polly

// RetryExample.cs
using Polly;
var policy = Policy.Handle<Exception>()
    .WaitAndRetry(3, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)));
policy.Execute(() =>
{
    // Code that might fail
    var config = TuskLang.Parse("unstable config");
});

🛠️ Real-World Error Handling Scenarios

- Config file missing: Use defaults, log warning - Database unavailable: Retry, fallback to cache - API failure: Circuit breaker, alert ops - User input errors: Validate and surface clearly

🧩 Best Practices

- Centralize error handling - Log all errors with context - Use custom exceptions for clarity - Test error and recovery paths - Alert on critical failures

🏁 You're Ready!

You can now: - Handle errors gracefully in C# TuskLang apps - Log and recover from failures - Build resilient, user-friendly systems

Next: Logging

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"We don't bow to any king" - Your resilience, your reliability, your peace of mind.

Fail gracefully. Recover confidently. 🛑