Class: PDTP::Server::FileService

Inherits:
FileService show all
Defined in:
lib/pdtp/server/file_service.rb,
lib/pdtp/server/file_service_protocol.rb

Overview

The file service provides utilities for determining various information about files.

Defined Under Namespace

Classes: Protocol

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ FileService

Returns a new instance of FileService.



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# File 'lib/pdtp/server/file_service.rb', line 35

def initialize     
  @root = ''
  @default_chunk_size = 512
end

Instance Attribute Details

#default_chunk_size ⇒ Object

Returns the value of attribute default_chunk_size.



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# File 'lib/pdtp/server/file_service.rb', line 33

def default_chunk_size
  @default_chunk_size
end

#root ⇒ Object

Returns the value of attribute root.



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# File 'lib/pdtp/server/file_service.rb', line 33

def root
  @root
end

Instance Method Details

#get_chunk_hash(url, chunk_id) ⇒ Object

returns the SHA256 hash of the specified chunk



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# File 'lib/pdtp/server/file_service.rb', line 70

def get_chunk_hash(url, chunk_id)
  Digest::SHA256.hexdigest(get_info(url).chunk_data(chunk_id)) rescue nil
end

#get_info(url) ⇒ Object

Retrieve information about a file. This should really be persistent FIXME the only authentication regarding registered files is performed by checking whether the registered file exists



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# File 'lib/pdtp/server/file_service.rb', line 43

def get_info(url)
  begin
    host = URI.parse(url).host
    
    #FIXME we should check host against a list of known hosts here
    info = FileInfo.new
    info.streaming = false
    info.base_chunk_size = @default_chunk_size
    info.path = get_local_path(url)
    raise if File.directory?(info.path)
    info.file_size = File.size?(info.path)
    return nil if info.file_size == 0 or info.file_size.nil?
  rescue
    return nil
  end
  
  info
end

#get_local_path(url) ⇒ Object

returns the path of this file on the local filesystem



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# File 'lib/pdtp/server/file_service.rb', line 63

def get_local_path(url)
  path = URI.parse(url).path
  path = path[1..path.size-1] #remove leading /
  (Pathname.new(@root) + path).to_s  
end