Class: Closure::FileResponse

Inherits:
Object
  • Object
show all
Defined in:
lib/closure/file_response.rb

Overview

Can be used as a Rack::Response. Provides advanced cache control.

Instance Attribute Summary (collapse)

Instance Method Summary (collapse)

Constructor Details

- (FileResponse) initialize(env, filename, content_type = nil)

Returns a new instance of FileResponse



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# File 'lib/closure/file_response.rb', line 22

def initialize(env, filename, content_type = nil)
  @env = env
  @filename = filename
  @status = 200
  @headers = {}
  @body = []
  
  begin
    raise Errno::EPERM unless File.file?(filename) and File.readable?(filename)
  rescue SystemCallError
    @body = ["404 Not Found\n"]
    @headers["Content-Length"] = @body.first.size.to_s
    @headers["Content-Type"] = "text/plain"
    @headers["X-Cascade"] = "pass"
    @status = 404
    return
  end
  
  # Caching strategy
  mod_since = Time.httpdate(env['HTTP_IF_MODIFIED_SINCE']) rescue nil
  last_modified = File.mtime(filename)
  @status = 304 and return if last_modified == mod_since
  @headers["Last-Modified"] = last_modified.httpdate
  if env['QUERY_STRING'] =~ /^[0-9]{9,10}$/ and last_modified == Time.at(env['QUERY_STRING'].to_i)
    @headers["Cache-Control"] = 'max-age=86400, public' # one day
  else
    @headers["Cache-Control"] = 'max-age=0, private, must-revalidate'
  end
  
  # Sending the file or reading an unknown length stream to send
  @body = self
  unless size = File.size?(filename)
    @body = [File.read(filename)]
    size = @body.first.respond_to?(:bytesize) ? @body.first.bytesize : @body.first.size
  end
  @headers["Content-Length"] = size.to_s
  @headers["Content-Type"] = content_type || Rack::Mime.mime_type(File.extname(filename), 'text/plain')
end

Instance Attribute Details

- (String) filename (readonly) Also known as: to_path

Filename attribute. Alias is used by some rack servers to detach from Ruby early.

Returns:

  • (String) 


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# File 'lib/closure/file_response.rb', line 74

def filename
  @filename
end

Instance Method Details

- each {|String| ... }

Support using self as a response body.

Yields:

  • (String) —

    8k blocks



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# File 'lib/closure/file_response.rb', line 63

def each
  File.open(@filename, "rb") do |file|
    while part = file.read(8192)
      yield part
    end
  end
end

- (Array) finish

Present the final response for rack.

Returns:

  • (Array) —
    status, headers, body 


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# File 'lib/closure/file_response.rb', line 84

def finish
  [@status, @headers, @body]
end

- (Boolean) found?

Was the file in the system and ready to be served?

Returns:

  • (Boolean) 


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# File 'lib/closure/file_response.rb', line 78

def found?
  @status == 200 or @status == 304
end