Top Level Namespace

Instance Method Summary collapse

Instance Method Details

#find_cmd(cmd) ⇒ Object

find command path array matching given ‘cmd` name in $PATH



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# File 'lib/lambda_convert/cli.rb', line 8

def find_cmd(cmd)
  (ENV['PATH'].split(File::PATH_SEPARATOR).map do |path|
    cmd_path = File.join(path, cmd)
    cmd_path if File.executable?(cmd_path) && !File.directory?(cmd_path)
  end).compact
end

#lambda_convert ⇒ Object 



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

def lambda_convert
  logger = Logger.new(STDERR)

  s3_region = ENV['CONVERT_S3_REGION'] || ENV['AWS_REGION']
  lambda_region = ENV['CONVERT_LAMBDA_REGION'] || ENV['AWS_REGION']
  aws_credentials = Aws::Credentials.new(
    ENV['CONVERT_ACCESS_KEY'] || ENV['AWS_ACCESS_KEY_ID'],
    ENV['CONVERT_SECRET_ACCESS_KEY'] || ENV['AWS_SECRET_ACCESS_KEY']
  )
  s3_bucket = ENV['CONVERT_S3_BUCKET']
  s3_key_prefix = ENV['CONVERT_S3_KEY_PREFIX'] || '_convert_tmp/'
  lambda_function = ENV['CONVERT_LAMBDA_FUNCTION'] || 'image-convert-prod'

  s3 = Aws::S3::Client.new(
    region: s3_region,
    credentials: aws_credentials
  )
  aws_lambda = Aws::Lambda::Client.new(
    region: lambda_region,
    credentials: aws_credentials
  )

  input_file, input_selecting = parse_input_path(ARGV[0])
  # Notice: there is also special output file syntax for convert command, but
  # we are not supporting them now, as we probably won't use it
  output_file = ARGV[-1]

  input_key = "#{s3_key_prefix}#{SecureRandom.uuid}"
  output_key = "#{s3_key_prefix}#{SecureRandom.uuid}"

  logger.info("Uploading file to s3://#{s3_bucket}/#{input_key}")
  File.open(input_file, 'rb') do |file|
    s3.put_object(bucket: s3_bucket, key: input_key, body: file)
  end
  source = '{source}'
  source += "[#{input_selecting}]" unless input_selecting.nil?
  instruction = {
    schema: 'envoy-convert-instruction',
    original: input_key,
    bucket: s3_bucket,
    write_options: {
      acl: 'private'
    },
    key: output_key,
    args: [source] + ARGV[1..-2] + ['{dest}']
  }
  logger.info("Invoking lambda with instruction #{instruction}")

  resp = aws_lambda.invoke(
    function_name: lambda_function,
    invocation_type: 'RequestResponse',
    payload: JSON.dump(instruction)
  )
  logger.info("Get response of invoke #{resp}")
  raise 'Failed to run convert on Lambda' if resp.status_code != 200

  logger.info(
    "Downloading file from s3://#{s3_bucket}/#{output_key} to #{output_file}"
  )
  s3.get_object(
    response_target: output_file,
    bucket: s3_bucket,
    key: output_key
  )
  logger.info('Done')
ensure
  logger.info("Delete files #{input_key} and #{output_key} from #{s3_bucket}")
  s3.delete_objects(
    bucket: s3_bucket,
    delete: {
      objects: [
        {
          key: input_key
        },
        {
          key: output_key
        }
      ],
      quiet: true
    }
  )
end

#local_convert ⇒ Object 



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# File 'lib/lambda_convert/cli.rb', line 106

def local_convert
  logger = Logger.new(STDERR)

  env = ENV.to_h
  # find the original convert bin path
  original_convert = find_cmd('convert').find do |path|
    # TODO: maybe we need a more robust way to determine whether is given
    # convert path from us or someone else
    File.dirname(path) != Gem.bindir && !path.include?('.rbenv/shims')
  end
  # we also put a CONVERT_RECURSIVE_FLAG to avoid somehow calling ourself again
  # by mistake
  env['CONVERT_RECURSIVE_FLAG'] = '1'
  logger.info("Running local convert #{original_convert} with args #{ARGV}")
  system(env, *([original_convert] + ARGV))
  abort('Failed to run local convert') unless $CHILD_STATUS.success?
  logger.info('Done')
end

#main ⇒ Object 



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# File 'lib/lambda_convert/cli.rb', line 125

def main
  abort('Recursive call') if ENV['CONVERT_RECURSIVE_FLAG'] == '1'
  lambda_convert
rescue StandardError => e
  logger = Logger.new(STDERR)
  logger.warn("Failed to convert via lambda, error=#{e}")
  fallback_disabled = (ENV['CONVERT_DISABLE_FALLBACK'].to_i != 0) || false
  if fallback_disabled
    abort("Failed to convert via lambda, no fallback, error=#{e}")
  end
  logger.info('Fallback to local convert command')
  local_convert
end

#parse_input_path(path) ⇒ Object 



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# File 'lib/lambda_convert/cli.rb', line 15

def parse_input_path(path)
  # convert command input path could be attached with selecting syntax, let's
  # parse it and return them in an array of [filename, selecting syntax]
  # ref: https://www.imagemagick.org/script/command-line-processing.php
  match = /([^\[\]]+)(\[(.+)\])?/.match(path)
  [match[1], match[3]]
end