413f9b2705
Timeouts are now handled correctly and the Runner automatically creates the execution environment if it could not be found in Poseidon. The runner is deleted locally if Poseidon returns a bad request error.
89 lines
2.1 KiB
Ruby
89 lines
2.1 KiB
Ruby
# frozen_string_literal: true
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require 'faye/websocket/client'
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require 'json_schemer'
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class Runner::Connection
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# These are events for which callbacks can be registered.
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EVENTS = %i[start output exit stdout stderr].freeze
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BACKEND_OUTPUT_SCHEMA = JSONSchemer.schema(JSON.parse(File.read('lib/runner/backend-output.schema.json')))
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TIMEOUT_EXIT_STATUS = -100
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def initialize(url)
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@socket = Faye::WebSocket::Client.new(url, [], ping: 5)
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# For every event type of faye websockets, the corresponding
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# RunnerConnection method starting with `on_` is called.
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%i[open message error close].each do |event_type|
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@socket.on(event_type) {|event| __send__(:"on_#{event_type}", event) }
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end
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# This registers empty default callbacks.
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EVENTS.each {|event_type| instance_variable_set(:"@#{event_type}_callback", ->(e) {}) }
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@start_callback = -> {}
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# Fail if no exit status was returned.
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@exit_code = 1
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end
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def on(event, &block)
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return unless EVENTS.include? event
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instance_variable_set(:"@#{event}_callback", block)
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end
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def send(data)
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@socket.send(encode(data))
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end
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private
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def decode(event)
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JSON.parse(event).deep_symbolize_keys
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end
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def encode(data)
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data
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end
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def on_message(event)
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return unless BACKEND_OUTPUT_SCHEMA.valid?(JSON.parse(event.data))
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event = decode(event.data)
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# There is one `handle_` method for every message type defined in the WebSocket schema.
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__send__("handle_#{event[:type]}", event)
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end
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def on_open(_event)
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@start_callback.call
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end
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def on_error(_event); end
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def on_close(_event)
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@exit_callback.call @exit_code
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end
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def handle_exit(event)
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@exit_code = event[:data]
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end
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def handle_stdout(event)
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@stdout_callback.call event[:data]
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@output_callback.call event[:data]
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end
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def handle_stderr(event)
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@stderr_callback.call event[:data]
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@output_callback.call event[:data]
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end
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def handle_error(_event); end
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def handle_start(_event); end
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def handle_timeout(_event)
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@exit_code = TIMEOUT_EXIT_STATUS
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raise Runner::Error::ExecutionTimeout.new('Execution exceeded its time limit')
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end
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end
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