Class: Etcenv::Cli

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*argv) ⇒ Cli

Returns a new instance of Cli.



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# File 'lib/etcenv/cli.rb', line 12

def initialize(*argv)
  @argv = argv
  @options = {
    etcd: URI.parse("http://localhost:2379"),
    format: DotenvFile,
    perm: 0600,
    mode: :oneshot,
  }
  parse!
end

Instance Attribute Details

#argv ⇒ Object (readonly)

Returns the value of attribute argv.



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# File 'lib/etcenv/cli.rb', line 23

def argv
  @argv
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/etcenv/cli.rb', line 23

def options
  @options
end

Instance Method Details

#etcd ⇒ Object 



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# File 'lib/etcenv/cli.rb', line 90

def etcd
  @etcd ||= Etcd.client(
    host: options[:etcd].host,
    port: options[:etcd].port,
    use_ssl: options[:etcd].scheme == 'https',
    ca_file: options[:etcd_ca_file],
    ssl_cert: options[:etcd_tls_cert],
    ssl_key: options[:etcd_tls_key],
  )
end

#oneshot ⇒ Object 



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# File 'lib/etcenv/cli.rb', line 101

def oneshot
  if argv.empty?
    $stderr.puts "error: no KEY specified. See --help for detail"
    return 1
  end
  env = argv.inject(nil) do |env, key|
    new_env = Environment.new(etcd, key).expanded_env
    env ? env.merge(new_env) : new_env
  end
  dump_env(env)

  0
end

#parse! ⇒ Object 



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# File 'lib/etcenv/cli.rb', line 38

def parse!
  parser = OptionParser.new do |opts|
    opts.banner = "Usage: etcenv [options] key ..."

    opts.on("-h", "--help", "show this help") do
      puts opts
      exit 0
    end

    opts.on("--watch", "-w", "continuous update mode") do
      options[:mode] = :watch
    end

    opts.on("--daemon", "-d", "daemonize") do
      options[:daemonize] = true
    end

    opts.on("--pidfile PIDFILE", "-p PIDFILE", "pidfile to use when deamonizing") do |pidpath|
      options[:pidfile] = pidpath
    end

    opts.on("-o PATH", "--output PATH", "save to speciifed file") do |path|
      options[:output] = path
    end

    opts.on("-m MODE", "--mode MODE", "mode (permission) to use when creating --output file, in octal. Default: 0600") do |perm|
      options[:perm] = perm.to_i(8)
    end

    opts.on("--docker", "use docker env-file format instead of dotenv.gem format") do
      options[:format] = DockerenvFile
    end

    opts.on("--etcd URL", "URL of etcd to connect; Any paths are ignored.") do |url|
      options[:etcd] = URI.parse(url)
    end

    opts.on("--etcd-ca-file PATH", "Path to CA certificate file (PEM) of etcd server") do |path|
      options[:etcd_ca_file] = path
    end

    opts.on("--etcd-cert-file PATH", "Path to client certificate file (PEM) for etcd server") do |path|
      options[:etcd_tls_cert] = OpenSSL::X509::Certificate.new(File.read(path))
    end

    opts.on("--etcd-key-file PATH", "Path to private key file for client certificate for etcd server") do |path|
      options[:etcd_tls_key] = OpenSSL::PKey::RSA.new(File.read(path))
    end
  end
  parser.parse!(argv)
end

#run ⇒ Object 



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# File 'lib/etcenv/cli.rb', line 25

def run
  parse!

  case options[:mode]
  when :oneshot
    oneshot
  when :watch
    watch
  else
    raise "[BUG] unknown mode"
  end
end

#watch ⇒ Object 



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# File 'lib/etcenv/cli.rb', line 115

def watch
  if argv.empty?
    $stderr.puts "error: no KEY specified. See --help for detail"
    return 1
  end

  if options[:daemonize]
    $stderr.puts "Daemonizing"
    Process.daemon(nil, true)
    if options[:pidfile]
      File.write options[:pidfile], "#{$$}\n"
    end
  end

  envs = argv.map { |key| Environment.new(etcd, key) }

  watchers = envs.map { |env| Watcher.new(env, verbose: true) }

  dumper_ch = Queue.new
  dumper = Thread.new do
    loop do
      $stderr.puts "[dumper] dumping env"
      env = envs.inject(nil) do |result, env|
        new_env = env.expanded_env
        result ? result.merge(new_env) : new_env
      end
      dump_env(env)
      dumper_ch.pop
    end
  end
  dumper.abort_on_exception = true

  watchers.map do |watcher|
    Thread.new do
      watcher.auto_reload_loop do
        dumper_ch << true
      end
    end
  end

  loop { sleep 1 }
end