Class: Droonga::Serf::Downloader

Inherits:
Object
  • Object
show all
Includes:
Loggable
Defined in:
lib/droonga/serf/downloader.rb

Defined Under Namespace

Classes: DownloadFailed

Constant Summary collapse

MAX_RETRY_COUNT = 
5
RETRY_INTERVAL = 
10
TARGET_VERSION = 
"0.6.3"

Instance Method Summary collapse

Constructor Details

#initialize(output_path) ⇒ Downloader

Returns a new instance of Downloader.



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# File 'lib/droonga/serf/downloader.rb', line 39

def initialize(output_path)
  @output_path = output_path
  @retry_count = 0
end

Instance Method Details

#download ⇒ Object 



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# File 'lib/droonga/serf/downloader.rb', line 44

def download
  detect_platform
  url_base = "https://dl.bintray.com/mitchellh/serf"
  base_name = "#{TARGET_VERSION}_#{@os}_#{@architecture}.zip"
  connection = Faraday.new(url_base) do |builder|
    builder.response(:follow_redirects)
    builder.adapter(Faraday.default_adapter)
  end
  response = connection.get(base_name)
  absolete_output_path = @output_path.expand_path
  Dir.mktmpdir do |dir|
    Archive::Zip.extract(StringIO.new(response.body),
                         dir,
                         :directories => false)
    FileUtils.mv("#{dir}/serf", absolete_output_path.to_s)
    FileUtils.chmod(0755, absolete_output_path.to_s)
  end
rescue Archive::Zip::UnzipError => archive_error
  logger.warn("Downloaded zip file is broken.",
              :detail => archive_error)
  if @retry_count < MAX_RETRY_COUNT
    @retry_count += 1
    sleep(RETRY_INTERVAL * @retry_count)
    download
  else
    raise DownloadFailed.new("Couldn't download serf executable. Try it later.")
  end
rescue Faraday::ConnectionFailed => network_error
  logger.warn("Connection failed.",
              :detail => network_error)
  if @retry_count < MAX_RETRY_COUNT
    @retry_count += 1
    sleep(RETRY_INTERVAL * @retry_count)
    download
  else
    raise DownloadFailed.new("Couldn't download serf executable. Try it later.")
  end
end