Module: FileCache

Defined in:
lib/rbbt/util/filecache.rb

Overview

Provides caching functionality for files downloaded from the internet

Constant Summary collapse

CACHEDIR = 
"/tmp/rbbt_cache"

Class Method Summary collapse

Class Method Details

.add(filename, content) ⇒ Object 



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# File 'lib/rbbt/util/filecache.rb', line 33

def self.add(filename, content)
  path = path(filename)
  
  FileUtils.makedirs(File.dirname(path), :mode => 0777)

  Misc.sensiblewrite(path, content)

  FileUtils.chmod 0666, path

  path
end

.cache_online_elements(ids, pattern = nil, &block) ⇒ Object 



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# File 'lib/rbbt/util/filecache.rb', line 63

def self.cache_online_elements(ids, pattern = nil, &block)
  ids = [ids] unless Array === ids

  result_files = {}
  missing = []
  ids.each do |id|
    filename = pattern ? pattern.sub("{ID}", id.to_s) : id.to_s

    if FileCache.found(filename)
      result_files[id] = FileCache.path(filename)
    else
      missing << id
    end
  end

  yield(missing).each do |id, content|
    filename = pattern ? pattern.sub("{ID}", id.to_s) : id.to_s
    path = FileCache.path(filename)
    Open.write(path, content)
    result_files[id] = path
  end if missing.any?

  result_files
end

.cachedir ⇒ Object 



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# File 'lib/rbbt/util/filecache.rb', line 18

def self.cachedir
  CACHEDIR
end

.cachedir=(cachedir) ⇒ Object 



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# File 'lib/rbbt/util/filecache.rb', line 13

def self.cachedir=(cachedir)
  CACHEDIR.replace cachedir
  FileUtils.mkdir_p CACHEDIR unless File.exist? CACHEDIR
end

.del(filename) ⇒ Object 



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# File 'lib/rbbt/util/filecache.rb', line 57

def self.del(filename)
  path = path(filename)

  FileUtils.rm path if File.exist? path
end

.found(filename) ⇒ Object 



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# File 'lib/rbbt/util/filecache.rb', line 45

def self.found(filename)
  File.exist? FileCache.path(filename)
end

.get(filename) ⇒ Object 



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# File 'lib/rbbt/util/filecache.rb', line 49

def self.get(filename)
  path = path(filename)

  return nil if ! File.exist? path

  File.open(path)
end

.path(filename) ⇒ Object 



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# File 'lib/rbbt/util/filecache.rb', line 22

def self.path(filename)
  filename = File.basename filename

  filename.match(/(.+)\.(.+)/)

  base = filename.sub(/\..+/,'')
  dirs = base.scan(/./).reverse.values_at(0,1,2,3,4).compact

  File.join(File.join(CACHEDIR, *dirs), filename) 
end