Class: CurlDownloadStrategy

Inherits:
AbstractFileDownloadStrategy show all
Defined in:
Library/Homebrew/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 inherited from AbstractFileDownloadStrategy

#basename, #cached_location, #symlink_location, #temporary_path

Methods inherited from AbstractDownloadStrategy

#basename, #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 'Library/Homebrew/download_strategy.rb', line 321

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

Instance Attribute Details

#mirrorsObject (readonly)


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# File 'Library/Homebrew/download_strategy.rb', line 319

def mirrors
  @mirrors
end

Instance Method Details

#clear_cacheObject


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# File 'Library/Homebrew/download_strategy.rb', line 377

def clear_cache
  super
  rm_rf(temporary_path)
end

#fetchObject

Download and cache the file at AbstractFileDownloadStrategy#cached_location.


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# File 'Library/Homebrew/download_strategy.rb', line 329

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

  urls = [url, *mirrors]

  begin
    url = urls.shift

    ohai "Downloading #{url}"

    resolved_url, _, url_time = resolve_url_basename_time(url)

    fresh = if cached_location.exist? && url_time
      url_time <= cached_location.mtime
    elsif version.respond_to?(:latest?)
      !version.latest?
    else
      true
    end

    if cached_location.exist? && fresh
      puts "Already downloaded: #{cached_location}"
    else
      begin
        _fetch(url: url, resolved_url: resolved_url)
      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
  end
ensure
  download_lock&.unlock
  download_lock&.path&.unlink
end