Class: Llv::CLI

Inherits:
Object
  • Object
show all
Defined in:
lib/llv/cli.rb

Constant Summary collapse

DEFAULTS = 
{
  port: 9292,
  host: "127.0.0.1",
  limit: 500,
  # Replay the whole file by default — when you launch llv you almost
  # always want to see what's already there. Pass --tail to opt out.
  from_start: true,
  tui: false,
  open_browser: true
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(argv) ⇒ CLI

Returns a new instance of CLI.



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# File 'lib/llv/cli.rb', line 22

def initialize(argv)
  @argv = argv.dup
  @options = DEFAULTS.dup
end

Class Method Details

.start(argv) ⇒ Object 



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# File 'lib/llv/cli.rb', line 18

def self.start(argv)
  new(argv).run
end

Instance Method Details

#install_traps ⇒ Object 



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# File 'lib/llv/cli.rb', line 59

def install_traps
  shutdown = lambda do |_signo = nil|
    $stderr.puts "\nllv: stopping"
    # Process.exit! is the only way out of Puma's Launcher loop once it has
    # decided to "gracefully" stop and is blocked on its own threads.
    Process.exit!(0)
  end
  Signal.trap("INT", &shutdown)
  Signal.trap("TERM", &shutdown)
end

#run ⇒ Object 



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# File 'lib/llv/cli.rb', line 27

def run
  parse!
  path = @argv.shift
  unless path
    warn "usage: llv [options] PATH/TO/development.log"
    exit 1
  end

  store = GroupStore.new(limit: @options[:limit])
  parser = Parser.new
  tailer = Tailer.new(path, from_start: @options[:from_start])

  # Tailer#each_line returns immediately after starting the listener +
  # poll threads, so we don't need an extra wrapper thread.
  tailer.each_line do |line|
    event = parser.parse(line)
    store.ingest(event)
  end

  @tailer = tailer
  if @options[:tui]
    require_relative "tui"
    install_traps
    Tui::Program.new(store: store).run
  else
    require_relative "web"
    start_web(store)
  end
ensure
  @tailer&.stop
end