[英]NodeJs - Wait for a promise resolution from an asyncronous method.
我编写了一个验证库,希望能够在Node中进行同步和异步调用。 我尝试将诺言与async / co结合使用,但我无处可去。 有谁对如何使此代码同步有很好的建议? 我正在尝试从验证工厂中调用此函数,返回的查询正在与数据库异步传递。
var lookupFactory = require('../lookup/lookupFactory');
var Promise = require("bluebird");
var async = require('async');
exports.validate = function (required, field, errors) {
if (required && field.value == null) {
errors.push('Field is required');
return;
}
var lookupType = field.validation.lookupType;
var s = lookupFactory.lookup(lookupType);
s.validate('12', function (err, data) {
if (data.length != 1) {
errors.push('Field value is not valid');
}
});
};
我喜欢无礼。
exports.validate = function (required, field, errors) {
return new Promise(function(fulfill) {
if (required && field.value == null) {
errors.push('Field is required');
return;
}
var lookupType = field.validation.lookupType;
var s = lookupFactory.lookup(lookupType);
s.validate('12', function (err, data) {
if (data.length != 1) {
errors.push('Field value is not valid');
}
fulfill(null /*Argument passed to the other function*/); //Is it here the code end?
});
});
}
exports.validate = function (required, field) {
var lookupType = field.validation.lookupType;
var s = lookupFactory.lookup(lookupType);
return new Promise(function(resolve, reject) {
if (required && field.value == null) {
return reject('Field is required');
}
s.validate('12', function (err, data) {
if(err) {
return reject(err);
} else if (data.length != 1) {
return reject('Field value is not valid');
}
resolve(data);
});
});
}
用法示例:
validate(true, 'name')
.then(function(data) { console.log('Validation succeeded:', data); },
function(reason) { console.log('Validation failed:', reason); });
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.