错误处理

当您的代码执行出现错误时，函数计算服务会以json的形式表示错误信息，包含错误类型（errorType），错误信息（errorMessage）和错误堆栈（stackTrace）。

示例index.js文件如下

exports.handler = async function () {
    return none;
};

此代码会导致函数计算服务引用错误，返回的错误信息如下

{
  "errorMessage": "none is not defined",
  "errorType": "ReferenceError",
  "stackTrace": [
    "ReferenceError: none is not defined",
    "    at Runtime.exports.handler (/var/task/code/index.js:2:5)",
    "    at Runtime.handleOnceNonStreaming (file:///var/runtime/index.mjs:1099:29)",
    "    at processTicksAndRejections (node:internal/process/task_queues:96:5)"
  ]
}

自定义错误信息

您可以在代码中主动抛出自定义的错误，示例如下

exports.handler = function(event, context, callback) {
    throw new Error('Something went wrong');
};

或者通过callback回调函数返回错误信息，示例如下

exports.handler = function(event, context, callback) {
    callback(new Error('Something went wrong'));
};

函数计算服务返回的错误信息

{
  "errorMessage": "Something went wrong",
  "errorType": "Error",
  "stackTrace": [
    "Error: Something went wrong",
    "    at Runtime.exports.handler (/var/task/code/index.js:2:11)",
    "    at Runtime.handleOnceNonStreaming (file:///var/runtime/index.mjs:1099:29)",
    "    at processTicksAndRejections (node:internal/process/task_queues:96:5)"
  ]
}