discourse/lib/socket_server.rb

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# frozen_string_literal: true
require 'socket'
class SocketServer
def initialize(socket_path)
@socket_path = socket_path
@server = nil
end
def start(&blk)
@server = UNIXServer.new(@socket_path)
@accept_thread = new_accept_thread
if blk
@blk = blk
end
end
def stop
@server&.close
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FileUtils.rm_f(@socket_path)
@server = nil
@blk = nil
end
protected
def new_accept_thread
server = @server
Thread.new do
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begin
done = false
while !done
done = !accept_connection(server)
end
ensure
self.stop
Rails.logger.info("Cleaned up socket server at #{@socket_path}")
end
end
end
def accept_connection(server)
socket = nil
begin
socket = server.accept
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rescue IOError, Errno::EPIPE
# socket was shut down or something catastrophic like that happened
return false
end
start = Time.now
line = +""
while Time.now - start < 10
if IO.select([socket], nil, nil, 10)
begin
line << socket.read_nonblock(1000)
rescue IO::WaitReadable
sleep 0.001
end
end
break if line.include?("\n")
end
if line.include?("\n")
socket.write get_response(line.strip)
end
true
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rescue IOError, Errno::EPIPE
# nothing to do here, case its normal on shutdown
rescue => e
Rails.logger.warn("Failed to handle connection #{e}:\n#{e.backtrace.join("\n")}")
ensure
socket&.close
end
def get_response(command)
if @blk
@blk.call(command)
else
raise "Must be implemented by child"
end
end
end