Ruby Http服务器在单独的线程中

Question

I'm using the code found on https://practicingruby.com/articles/implementing-an-http-file-server?u=dc2ab0f9bb to start a simple http server in Ruby.

This code works great. However, the server.accept call and the loop do block up the main thread. I've changed the code to the following:

require 'socket' # Provides TCPServer and TCPSocket classes

#start the server thread
server_thread = Thread.start do

    # Initialize a TCPServer object that will listen
    # on localhost:2345 for incoming connections.
    server = TCPServer.new('localhost', 2345)

    # loop infinitely
    loop do

      # use a seprate thread, acception multiple incoming connections
      Thread.start(server.accept) do |socket|

          # Read the first line of the request (the Request-Line)
          request = socket.gets

          response = "Hello World!\n"

          # We need to include the Content-Type and Content-Length headers
          # to let the client know the size and type of data
          # contained in the response. Note that HTTP is whitespace
          # sensitive, and expects each header line to end with CRLF (i.e. "\r\n")
          socket.print "HTTP/1.1 200 OK\r\n" +
                       "Content-Type: text/plain\r\n" +
                       "Content-Length: #{response.bytesize}\r\n" +
                       "Connection: close\r\n"

          # Print a blank line to separate the header from the response body,
          # as required by the protocol.
          socket.print "\r\n"

          # Print the actual response body, which is just "Hello World!\n"
          socket.print response

          # Close the socket, terminating the connection
          socket.close

      end#do
    end#do
end#do

This way the main Thread doesn't block, as the server runs in a separate thread. But, now when I browse to http://localhost:2345/ I get no return.

How can I run a server in a separate thread?

Important to know is that this script runs in an application that accepts Ruby plugins. So, it's not like the main thread will terminate, causing the sub thread to close to.

Answer 1

Here is the solution:

require 'socket' # Provides TCPServer and TCPSocket classes

#start the server thread
server_thread = Thread.start do

    # Initialize a TCPServer object that will listen
    # on localhost:2345 for incoming connections.
    server = TCPServer.new('localhost', 2345)

    # loop infinitely
    loop do
      puts "Server started"
      # use a seprate thread, acception multiple incoming connections
      Thread.start(server.accept) do |socket|

          # Read the first line of the request (the Request-Line)
          request = socket.gets

          response = "Hello World!\n"

          # We need to include the Content-Type and Content-Length headers
          # to let the client know the size and type of data
          # contained in the response. Note that HTTP is whitespace
          # sensitive, and expects each header line to end with CRLF (i.e. "\r\n")
          socket.print "HTTP/1.1 200 OK\r\n" +
                       "Content-Type: text/plain\r\n" +
                       "Content-Length: #{response.bytesize}\r\n" +
                       "Connection: close\r\n"

          # Print a blank line to separate the header from the response body,
          # as required by the protocol.
          socket.print "\r\n"

          # Print the actual response body, which is just "Hello World!\n"
          socket.print response

          # Close the socket, terminating the connection
          socket.close

      end#do
    end#do
end#do

spam_thread = Thread.start do
  loop do
    puts "Another thread"
    sleep 1
  end
end

server_thread.join
spam_thread.join

It is import to join all the threads spawned from the main thread, because every non-joined thread is killed if the main thread finished.In the example everything works because the main thread is in infinite loop that occupies the main thread, in your case the main thread finishes immediatly after you create the server thread.