5
我是node.js中的一个begginer,现在我试图获得一些API的结果。我使用异步模块(https://github.com/caolan/async)并行请求,以便优化。并行API请求的异步模块错误
问题是代码返回错误,在一个不同的API调用
这是每个时间点不同的行(即“回调(ERR,数据)”行)是错误:
if (called) throw new Error("Callback was already called.");
^
Error: Callback was already called.
我使用下面的函数来请求API:
function getData(s, apiURL, getURL, callback) {
var ht;
if (s == 1) {
ht = https;
} else {
ht = http;
}
var options = {
hostname : apiURL,
path : getURL,
method : 'GET'
}
var content = "";
ht.get(options, function(res) {
console.log("Got response: " + res.statusCode);
res.on("data", function(chunk) {
content += chunk;
//console.log(content);
callback(content);
});
}).on('error', function(e) {
console.log("Error: " + e.message);
console.log(e.stack);
});
}
为了说明这一点,这就是我如何使用异步模块:
var sources = sources.split(',')
async.parallel({
flickr : function(callback) {
if (sources[0] == 1) {
getData(0, 'api.flickr.com',
"/services/rest/?method=flickr.photos.search&format=json&nojsoncallback=1&api_key=" + config.flickr.appid + "&per_page=5&tags=" + tags,
function(data) {
callback(null, data); //here that the error may point
});
} else { callback(); }
},
instagram : function(callback) {
if (sources[1] == 1) {
getData(1, 'api.instagram.com',
"/v1/tags/" + tags.split(',')[0] + "/media/recent?client_id=" + config.instagram,
function(data) {
callback(null, data); //here that the error may point
});
} else { callback(); }
}
}, function(err, results) {
console.log(results);
});
希望你能帮助我,谢谢!