m13-domain-error
Design error handling by categorizing who handles each error and how they recover.
- Distinguish between user-facing errors (actionable messages), internal errors (debug details), system errors (monitoring), and transient vs. permanent failures to determine recovery strategy
- Use typed error enums with
thiserrorand implementis_retryable()checks to enable appropriate handling patterns - Apply recovery strategies: retry with exponential backoff for transient failures, fallback values for degraded modes, circuit breakers for cascading failures, and timeouts for slow operations
- Include error context via
.context()for debugging and structured logging with request IDs; avoid exposing internal details to end users
Domain Error Strategy
Layer 2: Design Choices
Core Question
Who needs to handle this error, and how should they recover?
Before designing error types:
- Is this user-facing or internal?
- Is recovery possible?
- What context is needed for debugging?
Error Categorization
| Error Type | Audience | Recovery | Example |
|---|
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