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142571bba0
* `rescue nil` is a really bad pattern to use in our code base. We should rescue errors that we expect the code to throw and not rescue everything because we're unsure of what errors the code would throw. This would reduce the amount of pain we face when debugging why something isn't working as expexted. I've been bitten countless of times by errors being swallowed as a result during debugging sessions.
87 lines
1.6 KiB
Ruby
87 lines
1.6 KiB
Ruby
require 'socket'
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class SocketServer
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def initialize(socket_path)
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@socket_path = socket_path
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@server = nil
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end
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def start(&blk)
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@server = UNIXServer.new(@socket_path)
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@accept_thread = new_accept_thread
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if blk
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@blk = blk
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end
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end
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def stop
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@server&.close
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FileUtils.rm_f(@socket_path)
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@server = nil
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@blk = nil
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end
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protected
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def new_accept_thread
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server = @server
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Thread.new do
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begin
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done = false
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while !done
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done = !accept_connection(server)
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end
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ensure
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self.stop
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Rails.logger.info("Cleaned up socket server at #{@socket_path}")
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end
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end
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end
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def accept_connection(server)
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socket = nil
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begin
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socket = server.accept
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rescue IOError, Errno::EPIPE
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# socket was shut down or something catastrophic like that happened
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return false
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end
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start = Time.now
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line = ""
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while Time.now - start < 10
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if IO.select([socket], nil, nil, 10)
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begin
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line << socket.read_nonblock(1000)
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rescue IO::WaitReadable
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sleep 0.001
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end
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end
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break if line.include?("\n")
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end
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if line.include?("\n")
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socket.write get_response(line.strip)
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end
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true
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rescue IOError, Errno::EPIPE
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# nothing to do here, case its normal on shutdown
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rescue => e
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Rails.logger.warn("Failed to handle connection in stats socket #{e}:\n#{e.backtrace.join("\n")}")
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ensure
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socket&.close
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end
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def get_response(command)
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if @blk
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@blk.call(command)
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else
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raise "Must be implemented by child"
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end
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end
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end
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