chorus-core 0.2.0

Core traits and types for Chorus CPaaS — SMS, Email, OTP with smart routing and multi-provider failover
Documentation 
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use thiserror::Error;

/// Errors that can occur during Chorus operations.
#[derive(Debug, Error)]
pub enum ChorusError {
    /// A specific provider returned an error.
    #[error("provider error ({provider}): {message}")]
    Provider { provider: String, message: String },

    /// All configured providers failed to deliver the message.
    #[error("all providers failed")]
    AllProvidersFailed,

    /// Input validation failed (e.g., missing required field).
    #[error("validation error: {0}")]
    Validation(String),

    /// The requested template slug was not found.
    #[error("template not found: {0}")]
    TemplateNotFound(String),

    /// Account quota has been exceeded.
    #[error("quota exceeded: {0}")]
    QuotaExceeded(String),

    /// The provided API key is invalid.
    #[error("invalid api key")]
    InvalidApiKey,

    /// Request was rate limited. Retry after the specified duration.
    #[error("rate limited")]
    RateLimited { retry_after_secs: u64 },

    /// An unexpected internal error occurred.
    #[error("internal error: {0}")]
    Internal(#[from] anyhow::Error),
}

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

    #[test]
    fn provider_error_display() {
        let err = ChorusError::Provider {
            provider: "twilio".into(),
            message: "timeout".into(),
        };
        assert_eq!(err.to_string(), "provider error (twilio): timeout");
    }

    #[test]
    fn all_providers_failed_display() {
        let err = ChorusError::AllProvidersFailed;
        assert_eq!(err.to_string(), "all providers failed");
    }

    #[test]
    fn validation_error_display() {
        let err = ChorusError::Validation("missing phone number".into());
        assert_eq!(err.to_string(), "validation error: missing phone number");
    }

    #[test]
    fn template_not_found_display() {
        let err = ChorusError::TemplateNotFound("welcome".into());
        assert_eq!(err.to_string(), "template not found: welcome");
    }

    #[test]
    fn quota_exceeded_display() {
        let err = ChorusError::QuotaExceeded("monthly limit reached".into());
        assert_eq!(err.to_string(), "quota exceeded: monthly limit reached");
    }

    #[test]
    fn invalid_api_key_display() {
        let err = ChorusError::InvalidApiKey;
        assert_eq!(err.to_string(), "invalid api key");
    }

    #[test]
    fn rate_limited_display() {
        let err = ChorusError::RateLimited {
            retry_after_secs: 30,
        };
        assert_eq!(err.to_string(), "rate limited");
    }

    #[test]
    fn internal_error_from_anyhow() {
        let anyhow_err = anyhow::anyhow!("something broke");
        let err = ChorusError::from(anyhow_err);
        assert!(err.to_string().contains("something broke"));
    }
}