如何使用 NodeJS 创建流 API [英] How to create a streaming API with NodeJS
问题描述
您将如何使用 Node 创建流式 API?就像 Twitter 流媒体 API.
How would you go to create a streaming API with Node? just like the Twitter streaming API.
我最终想要做的是从 FriendFeed api 获取第一个更新,并在新的一个可用(如果 id 不同),然后将其公开为 Web 服务,以便我可以在我的网站上将其与 WebSockets 一起使用:).
What I want to do ultimately is get the first update from the FriendFeed api, and stream when a new one becomes available (if the id is different), and later on expose it as a web service so I can use it with WebSockets on my website :).
到目前为止,我有这个:
So far I have this:
var sys = require('sys'),
http = require('http');
var ff = http.createClient(80, 'friendfeed-api.com');
var request = ff.request('GET', '/v2/feed/igorgue?num=1',
{'host': 'friendfeed-api.com'});
request.addListener('response', function (response) {
response.setEncoding('utf8'); // this is *very* important!
response.addListener('data', function (chunk) {
var data = JSON.parse(chunk);
sys.puts(data.entries[0].body);
});
});
request.end();
它只从FriendFeed获取数据,用node创建Http服务器很容易,但它不能返回一个流(或者我还没有找到).
Which only gets the data from FriendFeed, creating the Http server with node is easy but it can't return a stream (or I haven't yet found out how).
推荐答案
您可能希望建立一个系统来跟踪传入的请求并存储它们的响应对象.然后,当需要从 FriendFeed 流式传输新事件时,遍历它们的响应对象并将 responses[i].write('something')
输出给它们.
You would want to set up a system that keeps track of incoming requests and stores their response objects. Then when it's time to stream a new event from FriendFeed, iterate through their response objects and responses[i].write('something')
out to them.
查看 LearnBoost 的 Socket.IO-Node,您甚至可以将该项目用作您的框架,而不必自己编写代码.
Check out LearnBoost's Socket.IO-Node, you may even just be able to use that project as your framework and not have to code it yourself.
来自 Socket.IO-Node 示例应用程序(用于聊天):
From the Socket.IO-Node example app (for chat):
io.listen(server, {
onClientConnect: function(client){
client.send(json({ buffer: buffer }));
client.broadcast(json({ announcement: client.sessionId + ' connected' }));
},
onClientDisconnect: function(client){
client.broadcast(json({ announcement: client.sessionId + ' disconnected' }));
},
onClientMessage: function(message, client){
var msg = { message: [client.sessionId, message] };
buffer.push(msg);
if (buffer.length > 15) buffer.shift();
client.broadcast(json(msg));
}
});
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