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161
github-fast-env.rb
Executable file
161
github-fast-env.rb
Executable file
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#!/usr/bin/env ruby
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require "base64"
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require "optparse"
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require "socket"
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usage_output = "USAGE:\n github-fast-env SCRIPT_PATH [options]"
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$options = {:verbose => false}
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OptionParser.new do |options|
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options.banner = usage_output
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options.on("-v", "--verbose", "Show verbose output") do
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$options[:verbose] = true
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end
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end.parse!
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if not ARGV or ARGV.empty?
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$stderr.puts "error: missing argument (script path)\n\n"
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$stderr.puts usage_output
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exit 1
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end
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if ARGV.length > 1
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$stderr.puts "error: only one script expected\n\n"
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$stderr.puts usage_output
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exit 1
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end
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script_path = File.realpath(ARGV[0])
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control_socket_path = "/tmp/github-fast-envd.sock"
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$control_socket = UNIXSocket.new(control_socket_path)
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def log(level, message)
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if level == "error" or $options[:verbose]
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$stderr.puts "[github-fast-env] #{level}: #{message}"
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end
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end
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def read_command(control_socket)
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ready_ios = IO.select([control_socket], [], [], 10)
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if not ready_ios
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log "error", "timeout while communicating with github-fast-envd"
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exit 1
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end
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response = control_socket.readline.strip.split(" ", 2)
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if response.empty?
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log "error", "malformed response from github-fast-envd"
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exit 1
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end
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command = response[0]
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if command == "error"
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if response.length < 2
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log "error", "malformed error response from github-fast-envd"
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exit 1
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end
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error_message = response[1]
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log "error", "#{error_message}"
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exit 1
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end
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if command == "script_error"
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if response.length < 2
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log "error", "malformed script error response from github-fast-envd"
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exit 1
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end
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error_message = Base64.decode64(response[1])
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$stderr.puts error_message
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exit 1
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end
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arguments = response[1].nil? ? [] : response[1].split(" ")
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return command, arguments
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end
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log "info", "connected to control socket"
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encoded_script_path = Base64.encode64(script_path).delete("\n")
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$control_socket.puts "new v1 #{encoded_script_path}"
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pipes = {"stdin" => nil, "stdout" => nil, "stderr" => nil}
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while true
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command, arguments = read_command($control_socket)
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if command == "ready"
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break
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end
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if not ["stdin", "stdout", "stderr"].include?(command) or arguments.empty?
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log "error", "malformed response"
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exit 1
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end
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pipe_path = arguments[0]
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log "info", "connecting to #{pipe_path}"
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if command == "stdin"
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pipes[command] = File::open(pipe_path, "w")
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else
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pipes[command] = File::open(pipe_path, "r")
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end
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pipes[command].sync = true
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log "info", "connected"
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end
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log "info", "ready"
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$control_socket.puts "ready"
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read_ios = [$control_socket, $stdin, pipes["stdout"], pipes["stderr"]]
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while read_ios.include?($control_socket) or read_ios.include?(pipes["stdout"]) or read_ios.include?(pipes["stderr"])
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log "trace", read_ios.inspect
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ready_read_ios, _, _ = IO.select(read_ios, [], [])
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log "trace", "ready read IOs: #{ready_read_ios.inspect}"
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ready_read_ios.each do |ready_read_io|
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begin
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if ready_read_io.equal? $stdin
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log "trace", "writing to stdin"
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pipes["stdin"].write ready_read_io.readpartial(4096)
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elsif ready_read_io.equal? pipes["stdout"]
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log "trace", "reading from stdout"
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$stdout.write ready_read_io.readpartial(4096)
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elsif ready_read_io.equal? pipes["stderr"]
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log "trace", "reading from stderr"
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$stderr.write ready_read_io.readpartial(4096)
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elsif ready_read_io.equal? $control_socket
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log "trace", "reading from control socket"
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command, arguments = read_command($control_socket)
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if command != "done"
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log "error", "malformed response from github-fast-envd"
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end
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else
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log "warn", "received input from unknown stream"
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end
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rescue EOFError
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log "trace", "closing stream"
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ready_read_io.close
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end
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end
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read_ios = read_ios.select {|x| not x.closed?}
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end
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204
github-fast-envd.rb
Executable file
204
github-fast-envd.rb
Executable file
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#!/usr/bin/env ruby
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require "base64"
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require "socket"
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class ClientError < StandardError
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def initialize(message)
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super(message)
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end
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end
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class ClientScriptError < StandardError
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def initialize(source)
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super(source.message)
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@source = source
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end
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def source
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@source
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end
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end
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control_socket_path = "/tmp/github-fast-envd.sock"
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if File.exist?(control_socket_path) and File.socket?(control_socket_path)
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File.unlink(control_socket_path)
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end
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control_server = UNIXServer.new(control_socket_path)
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File.chmod 0700, control_socket_path
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#at_exit do
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# control_server.close
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#end
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$stderr.puts "serving control socket"
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connection_id = 0
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def open_pipe(connection_id, name)
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pipe_path = "/tmp/github-fast-envd.#{connection_id}.#{name}"
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if File.exist?(pipe_path) and File.pipe?(pipe_path)
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File.unlink(pipe_path)
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end
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File.mkfifo(pipe_path, mode = 0600)
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pipe_path
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end
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def read_command(control_socket)
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ready_ios = IO.select([control_socket], [], [], 10)
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if not ready_ios
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log "error", "timeout while communicating with github-fast-envd"
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exit 1
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end
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response = control_socket.readline.strip.split(" ", 2)
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if response.empty?
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log "error", "malformed response from github-fast-envd"
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exit 1
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end
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command = response[0]
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if command == "error"
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if response.length < 2
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log "error", "malformed error response from github-fast-envd"
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exit 1
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end
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error_message = response[1]
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log "error", "#{error_message}"
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exit 1
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end
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arguments = response[1].nil? ? [] : response[1].split(" ")
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return command, arguments
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end
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while true
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control_socket = control_server.accept
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$stderr.puts "- new connection"
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begin
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command, arguments = read_command(control_socket)
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if command != "new"
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raise ClientError.new "unexpected command"
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end
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if arguments.length != 2
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raise ClientError.new "malformed command"
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end
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if arguments[0] != "v1"
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raise ClientError.new "unsupported protocol version"
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end
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connection_id += 1
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child_process = fork {
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original_stdin = $stdin.dup
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original_stdout = $stdout.dup
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original_stderr = $stderr.dup
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begin
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stdin = open_pipe(connection_id, "stdin")
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control_socket.puts "stdin #{stdin}"
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stdin = File::open(stdin, "r")
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stdin.sync = true
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stdout = open_pipe(connection_id, "stdout")
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control_socket.puts "stdout #{stdout}"
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stdout = File::open(stdout, "w")
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stdout.sync = true
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stderr = open_pipe(connection_id, "stderr")
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control_socket.puts "stderr #{stderr}"
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stderr = File::open(stderr, "w")
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stderr.sync = true
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$stderr.puts " set up pipes"
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control_socket.puts "ready"
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response = control_socket.readline.strip
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if response != "ready"
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raise ClientError.new "invalid command"
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Kernel.exit!
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end
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script_path = Base64.decode64(arguments[1])
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$stderr.puts " executing script " + script_path
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$stdin.reopen(stdin)
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$stdout.reopen(stdout)
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$stderr.reopen(stderr)
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begin
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load script_path, true
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rescue => error
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$stdin = original_stdin
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$stdout = original_stdout
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$stderr = original_stderr
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raise ClientScriptError.new error
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end
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rescue ClientScriptError => error
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# TODO: Restore pipes to make sure that syntax errors are caught
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encoded_error_output = Base64.encode64(error.source.full_message).delete("\n")
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original_stderr.puts " error executing script, ignoring request"
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# TODO: if the begin/rescue blog has syntax errors, these go unnoticed
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begin
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control_socket.puts "script_error #{encoded_error_output}"
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rescue
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end
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rescue ClientError => error
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original_stderr.puts " error communicating with client, ignoring request (#{error})"
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begin
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control_socket.puts "error #{error}"
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rescue
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end
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rescue StandardError => error
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original_stderr.puts " error, ignoring request (#{error})"
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begin
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control_socket.puts "error internal server error"
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rescue
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end
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end
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begin
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control_socket.puts "done"
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rescue
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end
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control_socket.close
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original_stderr.puts " finished handling request"
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Kernel.exit!
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}
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Process.detach(child_process)
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rescue ClientError => error
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$stderr.puts " error communicating with client, ignoring request (#{error})"
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begin
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control_socket.puts "error #{error}"
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rescue
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end
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rescue StandardError => error
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$stderr.puts " error, ignoring request (#{error})"
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begin
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control_socket.puts "error internal server error"
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rescue
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end
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end
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control_socket.close
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end
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