error-handling-debugging

Error Handling & Debugging Skill

Comprehensive error handling and debugging strategies for Tauri + Rust + React applications.

Rust Error Handling

Error Chain with anyhow

use anyhow::{Context, Result, anyhow, bail};

pub async fn complex_operation(&self) -> Result<Output> {
    let data = self.fetch_data()
        .await
        .context("获取数据失败")?;

    if data.is_empty() {
        bail!("数据为空，无法继续处理");
    }

    let processed = self.process_data(&data)
        .context("处理数据失败")?;

    Ok(processed)
}

ApiResponse Conversion Pattern

use crate::utils::error::{api_err, api_ok, ApiResponse};

#[tauri::command]
#[specta::specta]
pub async fn handle_formula_request(
    dto: FormulaDto,
    state: State<'_, TauriAppState>,
) -> ApiResponse<Formula> {
    // Using with_service helper for automatic error conversion
    with_service(state, |ctx| async move {
        ctx.formula_service.create_formula(dto).await
    })
    .await
}

// Manual conversion
#[tauri::command]
#[specta::specta]
pub async fn manual_error_handling() -> ApiResponse<Data> {
    match perform_operation().await {
        Ok(data) => api_ok(data),
        Err(e) => {
            // Log error internally
            error!("Operation failed: {:?}", e);
            // Return user-friendly message
            api_err(format!("操作失败，请检查输入后重试"))
        }
    }
}

Custom Error Types

use thiserror::Error;

#[derive(Error, Debug)]
pub enum FormulaError {
    #[error("配方不存在: {id}")]
    FormulaNotFound { id: i64 },

    #[error("营养约束冲突: {nutrient}")]
    NutritionConflict { nutrient: String },

    #[error("优化失败: {reason}")]
    OptimizationFailed { reason: String },

    #[error("数据库错误: {0}")]
    Database(#[from] sqlx::Error),

    #[error("IO错误: {0}")]
    Io(#[from] std::io::Error),
}

impl From<FormulaError> for ApiResponse<()> {
    fn from(err: FormulaError) -> Self {
        match err {
            FormulaError::FormulaNotFound { id } => {
                api_err(format!("配方 ID {} 不存在", id))
            }
            FormulaError::NutritionConflict { nutrient } => {
                api_err(format!("营养约束 {nutrient} 冲突，请调整约束范围"))
            }
            FormulaError::OptimizationFailed { reason } => {
                api_err(format!("配方优化失败: {}", reason))
            }
            _ => api_err(format!("操作失败: {}", err)),
        }
    }
}