javascript - 如何通知客户端浏览器有关服务器上的某些事件？

Question

我在服务器端使用 python (Tornado)，在客户端使用一些 javascript。我有常见的情况 - 一个用户向另一个用户发送消息。我希望服务器将新消息通知客户端的浏览器(消息的接收者)。我该怎么做？我应该与客户端建立长期连接(可能使用 websocket)还是其他方式？

附言为了通过 websocket 建立连接，我找到了很好的库 TornadIO

PS2因此，由于在 betwebb 服务器和每个客户端之间建立连接的项目负载很高，因此看起来很可疑。我怕c10k的问题。可能这只是我缺乏知识。

Answer 1

I'm using python (Tornado) on server side and some javascript on a client side. I have the common situation - one user send a message to another. And I want server to notify client's browser (reciever of the message) about new message. How can I do it? Should I establish long-alive connection with client (maybe using websocket) or something else?

使用实时网络服务器，例如 Tornado - 是的。 TornadIO 看起来是一个很好的解决方案，因为它将使用 socket.io，它具有适用于旧版浏览器的回退选项。

Wikipedia entry on the C10k issues提供已解决此问题的服务器列表:

A few web servers have been developed to counter the C10K problem:

• nginx, which relies on an event-driven (asynchronous) architecture, instead of threads, to handle requests (WordPress.com uses nginx to solve the C10K problem)[2]
• Lighttpd, which relies on an asynchronous architecture to handle requests[3]
• Cherokee, a lightweight web server[4]
• Tornado, a non-blocking web server and web application framework[5] written in Python
• Apache Deft, asynchronous, non-blocking web server running on the JVM
• JBoss Netty, a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients[6]
• Node.js, asynchronous, non-blocking web server running on Google's V8 JavaScript engine[7]
• EventMachine, an asynchronous, non-blocking web server running on Ruby EventMachine
• Yaws, a web server written in Erlang; profiting from Erlang's extremely lightweight processes.
• Medusa, a non-blocking web server library written in Python

如您所见，列出了 Tornado。

除此之外，您的问题可能更多关于 horizontal scaling而不是关于如何实现服务器到客户端的通知。

取决于哪个realtime server solution你选择这可能永远不会成为问题。例如，Caplin System's Liberator 的单个实例可以实现超过 10,000 个持久连接。