Class: CurlDownloadStrategy

Inherits:
AbstractFileDownloadStrategy show all
Includes:
Utils::Curl
Defined in:
download_strategy.rb

Overview

Strategy for downloading files using curl.

Instance Attribute Summary collapse

Attributes inherited from AbstractDownloadStrategy

#cache, #cached_location, #source_modified_time, #url

Instance Method Summary collapse

Methods included from Utils::Curl

clear_path_cache, curl, curl_args, curl_check_http_content, curl_download, curl_executable, curl_headers, curl_http_content_headers_and_checksum, curl_output, curl_path, curl_response_follow_redirections, curl_response_last_location, curl_supports_tls13?, curl_with_workarounds, http_status_ok?, parse_curl_output, url_protected_by_cloudflare?, url_protected_by_incapsula?

Methods inherited from AbstractFileDownloadStrategy

#basename, #cached_location, #symlink_location, #temporary_path

Methods inherited from AbstractDownloadStrategy

#basename, #quiet?, #shutup!, #stage

Methods included from Context

current, current=, #debug?, #quiet?, #verbose?, #with_context

Constructor Details

#initialize(url, name, version, **meta) ⇒ CurlDownloadStrategy

Returns a new instance of CurlDownloadStrategy.



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# File 'download_strategy.rb', line 385

def initialize(url, name, version, **meta)
  super
  @try_partial = true
  @mirrors = meta.fetch(:mirrors, [])

  # Merge `:header` with `:headers`.
  if (header = meta.delete(:header))
    meta[:headers] ||= []
    meta[:headers] << header
  end

  super
end

Instance Attribute Details

#mirrors ⇒ Object (readonly) 



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# File 'download_strategy.rb', line 383

def mirrors
  @mirrors
end

Instance Method Details

#clear_cache ⇒ Object 



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# File 'download_strategy.rb', line 459

def clear_cache
  super
  rm_rf(temporary_path)
end

#fetch(timeout: nil) ⇒ Object

Download and cache the file at AbstractFileDownloadStrategy#cached_location.



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# File 'download_strategy.rb', line 402

def fetch(timeout: nil)
  end_time = Time.now + timeout if timeout

  download_lock = LockFile.new(temporary_path.basename)
  download_lock.lock

  urls = [url, *mirrors]

  begin
    url = urls.shift

    ohai "Downloading #{url}"

    use_cached_location = cached_location.exist?
    use_cached_location = false if version.respond_to?(:latest?) && version.latest?

    resolved_url, _, last_modified, _, is_redirection = begin
      resolve_url_basename_time_file_size(url, timeout: end_time&.remaining!)
    rescue ErrorDuringExecution
      raise unless use_cached_location
    end

    # Authorization is no longer valid after redirects
    meta[:headers]&.delete_if { |header| header.start_with?("Authorization") } if is_redirection

    # The cached location is no longer fresh if Last-Modified is after the file's timestamp
    use_cached_location = false if cached_location.exist? && last_modified && last_modified > cached_location.mtime

    if use_cached_location
      puts "Already downloaded: #{cached_location}"
    else
      begin
        _fetch(url: url, resolved_url: resolved_url, timeout: end_time&.remaining!)
      rescue ErrorDuringExecution
        raise CurlDownloadStrategyError, url
      end
      ignore_interrupts do
        cached_location.dirname.mkpath
        temporary_path.rename(cached_location)
        symlink_location.dirname.mkpath
      end
    end

    FileUtils.ln_s cached_location.relative_path_from(symlink_location.dirname), symlink_location, force: true
  rescue CurlDownloadStrategyError
    raise if urls.empty?

    puts "Trying a mirror..."
    retry
  rescue Timeout::Error => e
    raise Timeout::Error, "Timed out downloading #{self.url}: #{e}"
  end
ensure
  download_lock&.unlock
  download_lock&.path&.unlink
end

#resolved_time_file_size(timeout: nil) ⇒ Object 



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# File 'download_strategy.rb', line 464

def resolved_time_file_size(timeout: nil)
  _, _, time, file_size = resolve_url_basename_time_file_size(url, timeout: timeout)
  [time, file_size]
end