Egg-bizerror NPM

egg-bizerror

handle biz error for Egg.

Install

$ npm i egg-bizerror --save

Usage

// config/plugin.js
exports.bizerror = {
  enable: true,
  package: 'egg-bizerror',
};

Configuration

// config/config.default.js
exports.bizerror = {
  breakDefault: false, // disable default error handler
  sendClientAllParams: false, // return error bizParams to user
  interceptAllError: false, // handle all exception, not only bizError exception
};

// config/errorcode.js
module.exports = {
  'USER_NOT_EXIST': {
    status: 400,
    code: '400' // override code value
    message: 'can`t find user info',
    errorPageUrl: '', // app will redirect this url when accepts is html 
    addtion1: 'a', // any, will return to browser
  },
  'NOT_FOUND': {
    errorPageUrl: (ctx, error) => {
      return '/404.html';
    }
  }
  '404': (ctx, error) => {
    ctx.redirect('/404.html');
    return false; // you can return false, break default logic
  }
}

API

ctx.throwBizError(code, error, bizParams)
throw an biz error
- code - error.code, default SYSTEM_EXCEPTION, read errorcode config with this value when handle error.
- error - error message or Error object.
- bizParams - error.bizParams, extra data, can help you solve the problem.
- bizParams.sendClient - object, this object will copy to the property errors of json object and send to client.
- bizParams.code - it will cover error.code.
- bizParams.log - error.log, if false, not log this error, defalut true.

// throw an error object
// error.code
// error.message
// error.log
// error.bizParams
// error.bizError
ctx.throwBizError('system_exception')
ctx.throwBizError(new Error())
ctx.throwBizError({ code: 'system_exception', log: false })
ctx.throwBizError('system_exception', { userId: 1, log: false })
ctx.throwBizError('system_exception', 'error message')
ctx.throwBizError('system_exception', new Error())
ctx.throwBizError(new Error(), { userId: 1, log: false })
ctx.throwBizError('system_exception', 'error message', { userId: 1, log: false })

ctx.responseBizError(error, bizParams)
handle the error
- bizParams - supports the above
- bizParams.bizError - if you want the plugin to handle this error, you must be set bizError: true, otherwise, the plugin will throw this error.
app.on('responseBizError', (ctx, error) => {})
you can add listener to do some thing.
app.BizErrorHandler - default handler class, you can override it

Example

// app/service/user.js
module.exports = app => {
  class User extends app.Service {
    async getUserId() {
      let userInfo;
      try {
        userInfo = await this.getUser();
      } catch (error) {
        ctx.responseBizError(error, { bizError: true, code: 'USER_NOT_EXIST' })
        return;
      }
      
      if (!userInfo || !userInfo.id) {
        ctx.throwBizError('USER_NOT_EXIST');
      }
      return userInfo.id;
    }
  }
  return User;
};

// app.js
// add handle logic
module.exports = app => {
  app.on('responseBizError', (ctx, error) => {
    if (error.bizParams && error.bizParams.bizType === 'getUser') {
      errorCount++;
    }
  });
};

// app.js
// override default handler
module.exports = app => {
  app.BizErrorHandler = class extends app.BizErrorHandler {
    json(ctx, error, config) {
      ctx.body = {
        code: config.code,
        msg: config.message,
      };
    }
  }
};