32 |
33 | Just a simple timestamp server
34 | In this demo, the server sends the current timestamp over a WebSocket once per second. The server generates raw WebSocket frames and sends them to the client using the Rack socket hijacking API. You can see the received timestamps below.
35 |
41 |
42 | - Nothing received from the server yet...
43 |
44 |
45 |
46 |
](http://www.phusion.nl/)
52 |
53 | Please enjoy Phusion Passenger, a product by [Phusion](http://www.phusion.nl/). :-)
54 |
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/config.ru:
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1 | require 'websocket'
2 | require 'thread'
3 |
4 | def server_handshake(env)
5 | data = "#{env['REQUEST_METHOD']} #{env['REQUEST_URI']} #{env['SERVER_PROTOCOL']}\r\n"
6 | env.each_pair do |key, val|
7 | if key =~ /^HTTP_(.*)/
8 | name = rack_env_key_to_http_header_name($1)
9 | data << "#{name}: #{val}\r\n"
10 | end
11 | end
12 | data << "\r\n"
13 |
14 | server = WebSocket::Handshake::Server.new
15 | server << data
16 | puts "WebSocket request:"
17 | puts data
18 | puts
19 | puts "WebSocket response:"
20 | puts server
21 | server
22 | end
23 |
24 | def rack_env_key_to_http_header_name(key)
25 | name = key.downcase.gsub('_', '-')
26 | name[0] = name[0].upcase
27 | name.gsub!(/-(.)/) do |chr|
28 | chr.upcase
29 | end
30 | name
31 | end
32 |
33 | def process_input(io, server, input_parser)
34 | done = false
35 |
36 | # Slurp as much input as possible.
37 | begin
38 | while select([io], nil, nil, 0)
39 | input_parser << io.readpartial(1024)
40 | end
41 | rescue EOFError
42 | done = true
43 | end
44 |
45 | # Parse all input into WebSocket frames and process them.
46 | while (frame = input_parser.next)
47 | case frame.type
48 | when :data
49 | send_output(io, server, "Echo: #{frame}\n")
50 | when :close
51 | done = true
52 | end
53 | end
54 |
55 | done
56 | end
57 |
58 | def send_output(io, server, data)
59 | frame = WebSocket::Frame::Outgoing::Server.new(
60 | :version => server.version,
61 | :data => data,
62 | :type => :text)
63 | io.write(frame.to_s)
64 | end
65 |
66 | def serve_websocket(env)
67 | # On every request, hijack the socket using the Rack socket hijacking API
68 | # (http://blog.phusion.nl/2013/01/23/the-new-rack-socket-hijacking-api/),
69 | # then operate on the socket directly to send WebSocket messages.
70 | env['rack.hijack'].call
71 | io = env['rack.hijack_io']
72 | Thread.new do
73 | begin
74 | puts "WebSocket begun"
75 |
76 | # Parse client handshake message and send server handshake response.
77 | server = server_handshake(env)
78 | io.write(server.to_s)
79 |
80 | # Handle input and stream responses.
81 | input_parser = WebSocket::Frame::Incoming::Server.new(:version => server.version)
82 | done = false
83 | while !done
84 | done = process_input(io, server, input_parser)
85 | send_output(io, server, "#{Time.now}\n")
86 | sleep 1
87 | end
88 | rescue Exception => e
89 | STDERR.puts "*** ERROR: #{e} (#{e.class})\n#{e.backtrace.join("\n")}"
90 | ensure
91 | puts "WebSocket finished"
92 | io.close
93 | end
94 | end
95 | end
96 |
97 | def serve_static_file(env)
98 | if env["PATH_INFO"] == "/"
99 | env["PATH_INFO"] = "/index.html"
100 | end
101 | public_dir = File.expand_path(File.dirname(__FILE__)) + "/public"
102 | Rack::File.new(public_dir).call(env)
103 | end
104 |
105 | app = proc do |env|
106 | if env["PATH_INFO"] == "/websocket"
107 | serve_websocket(env)
108 | else
109 | serve_static_file(env)
110 | end
111 | end
112 |
113 | run app
114 |
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/public/.gitkeep:
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https://raw.githubusercontent.com/phusion/passenger-ruby-websocket-demo/3f321cf26ea5079aafbf99bb482ddc241591cbb4/public/.gitkeep
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/public/images/bg_hr.png:
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/public/images/blacktocat.png:
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/public/images/icon_download.png:
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/public/images/sprite_download.png:
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/public/index.html:
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