Question

我正在尝试将回调函数转换为Promise，
我为此使用util.promisify，以下是我的工作代码与新的不工作代码。

工作代码，使用节点回调样式-

let AWS = require(aws-sdk');
let moduleName = process.env.Module;

module.exports = {
    getConstants
};

function getConstants (callback) {
    let client = new AWS.SSM({
        region: "us-east-1"
    });

    let smName = "/somePath";

    let params = {
        Names: [smName]
    };

    client.getParameters(params, function (err, data) {
        if (err) {
            console.log(err, err.stack);
            callback(err, null);
        }
        else{
            console.log(METHOD_TAG,'Parameter Store call successful!');
            let constantVariables = data.Parameters[0].Value;
            callback(null, constantVariables);
        }
    });
}

新的无效代码-

let AWS = require('aws-sdk');
let util = require('util');
let moduleName = process.env.Module;

module.exports.getConstants = async () => {
    let client = new AWS.SSM({
        region: "us-east-1"
    });

    let smName = "/somePath";

    let params = {
        Names: [smName]
    };

    let parameterStore = util.promisify(client.getParameters).bind(client);
    let response = await parameterStore.getParameters(params);
    let constantVariables = response.Parameters[0].Value;
    return constantVariables;
};

我遇到以下错误-

TypeError: parameterStore.getParameters is not a function"

当尝试使AWS.SSM客户端的getParameters函数合理化时。
我在做错什么，我应该改变什么？

参考-
https://medium.com/@suyashmohan/util-promisify-in-node-js-v8-d07ef4ea8c53

https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/SSM.html#getParameters-property

如何使用util.promisify来实现NodeJ中的功能？

0 个答案: