Class: Origen::SiteConfig::Config

Inherits:
Object
  • Object
show all
Defined in:
lib/origen/site_config/config.rb

Constant Summary collapse

RESTRICTED_FROM_CENTRALIZED_VARIABLES =
%w(centralized_site_config centralized_site_config_cache_dir centralized_site_config_verify_ssl)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path:, parent:, values: nil) ⇒ Config

Returns a new instance of Config



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# File 'lib/origen/site_config/config.rb', line 11

def initialize(path:, parent:, values: nil)
  @parent = parent
  if path == :runtime
    path = "runtime_#{object_id}"
    @type = :runtime
  elsif path.start_with?('http')
    @path = path
    @type = :centralized
  else
    @path = path
    @type = :local
  end
  @contains_centralized = false
  @loaded = false

  if values
    @values = values
    @loaded = true
  else
    @values = nil
    load
  end
end

Instance Attribute Details

#parentObject (readonly)

Returns the value of attribute parent



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# File 'lib/origen/site_config/config.rb', line 5

def parent
  @parent
end

#pathObject (readonly)

Returns the value of attribute path



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# File 'lib/origen/site_config/config.rb', line 4

def path
  @path
end

#typeObject (readonly)

Returns the value of attribute type



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# File 'lib/origen/site_config/config.rb', line 6

def type
  @type
end

#valuesObject (readonly)

Returns the value of attribute values



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# File 'lib/origen/site_config/config.rb', line 7

def values
  @values
end

Instance Method Details

#cached?Boolean

Returns:

  • (Boolean)


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# File 'lib/origen/site_config/config.rb', line 60

def cached?
  File.exist?(cached_file)
end

#cached_fileObject



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# File 'lib/origen/site_config/config.rb', line 56

def cached_file
  @cached_file ||= Pathname(parent.centralized_site_config_cache_dir).join('cached_config')
end

#centralized?Boolean

Returns:

  • (Boolean)


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# File 'lib/origen/site_config/config.rb', line 198

def centralized?
  type == :centralized
end

#fetchObject Also known as: refresh



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# File 'lib/origen/site_config/config.rb', line 64

def fetch
  def inform_user_of_cached_file
    if cached?
      puts yellow('Origen: Site Config: Found previously cached site config. Using the older site config.')
    else
      puts yellow('Origen: Site Config: No cached file found. An empty site config will be used in its place.')
    end
    puts
  end

  if centralized?
    puts "Pulling centralized site config from: #{path}"

    begin
      # TODO: needs to be replaced with a net/http equivalent, can't use gems here. The reference
      # to HTTParty will raise an error until that is done, but it will be handled gracefully below.
      text = HTTParty.get(path, verify: parent.find_val('centralized_site_config_verify_ssl'))
      puts "Caching centralized site config to: #{cached_file}"

      unless Dir.exist?(cached_file.dirname)
        FileUtils.mkdir_p(cached_file.dirname)
      end
      File.open(cached_file, 'w+') do |f|
        f.write(text)
      end

    rescue SocketError => e
      puts red("Origen: Site Config: Unable to connect to #{path}")
      puts red('Origen: Site Config: Failed to retrieve centralized site config!')
      puts red("Error from exception: #{e.message}")

      inform_user_of_cached_file
    rescue OpenSSL::SSL::SSLError => e
      puts red("Origen: Site Config: Unable to connect to #{path}")
      puts red('Origen: Site Config: Failed to retrieve centralized site config!')
      puts red("Error from exception: #{e.message}")
      puts red('It looks like the error is related to SSL certification. If this is a trusted server, you can use')
      puts red("the site config setting 'centralized_site_config_verify_ssl' to disable verifying the SSL certificate.")

      inform_user_of_cached_file
    rescue Exception => e
      # Rescue anything else to avoid any un-caught exceptions causing Origen not to boot.
      # Print lots of red so that the users are aware that there's a problem, but don't ultimately want this
      # to render Origen un-bootable
      puts red("Origen: Site Config: Unexpected exception ocurred trying to either retrieve or cache the site config at #{path}")
      puts red('Origen: Site Config: Failed to retrieve centralized site config!')
      puts red("Class of exception:   #{e.class}")
      puts red("Error from exception: #{e.message}")

      inform_user_of_cached_file
    end
    text
  end
end

#find_val(val) ⇒ Object Also known as: []

Finds the value from this config, or from one of its centralized configs (if applicable)



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# File 'lib/origen/site_config/config.rb', line 185

def find_val(val)
  @values[val]
end

#has_var?(var) ⇒ Boolean

Returns:

  • (Boolean)


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# File 'lib/origen/site_config/config.rb', line 180

def has_var?(var)
  @values.key?(var)
end

#inform_user_of_cached_fileObject



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# File 'lib/origen/site_config/config.rb', line 65

def inform_user_of_cached_file
  if cached?
    puts yellow('Origen: Site Config: Found previously cached site config. Using the older site config.')
  else
    puts yellow('Origen: Site Config: No cached file found. An empty site config will be used in its place.')
  end
  puts
end

#loadObject

Loads the site config into memory. Process the site config as an ERB, if indicated to do so (.erb file extension) After the initial load, any centralized site configs will be retreived (if needed), cached, and loaded.



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# File 'lib/origen/site_config/config.rb', line 123

def load
  def read_erb(erb)
    ERB.new(File.read(erb), 0, '%<>')
  end

  if centralized?
    if !cached?
      if fetch
        erb = read_erb(cached_file)
      else
        # There was a problem fetching the config. Just use an empty string.
        # Warning message will come from #fetch
        erb = ERB.new('')
      end
    else
      erb = read_erb(cached_file)
    end

    @values = (YAML.load(erb.result) || {})
  else
    if File.extname(path) == '.erb'
      erb = read_erb(path)
      @values = (YAML.load(erb.result) || {})
    else
      @values = (YAML.load_file(path) || {})
    end
  end

  unless @values.is_a?(Hash)
    puts red("Origen: Site Config: The config at #{path} was not parsed as a Hash, but as a #{@values.class}")
    puts red('                     Please review the format of the this file.')
    puts red('                     Alternatively, an error condition may have been received from the server.')
    puts red("                     This site config is available at: #{cached_file}")
    puts red('                     This config will not be loaded and will be replaced with an empty config.')
    puts
    @values = {}
  end

  if centralized?
    # check for restricted centralized config values
    RESTRICTED_FROM_CENTRALIZED_VARIABLES.each do |var|
      if @values.key?(var)
        val = @values.delete(var)
        puts red("Origen: Site Config: config variable #{var} is not allowed in the centralized site config and will be removed.")
        puts red("                     Value #{val} will not be applied!")
      end
    end
  end

  @loaded = true
  @values
end

#loaded?Boolean

Returns:

  • (Boolean)


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# File 'lib/origen/site_config/config.rb', line 190

def loaded?
  @loaded
end

#local?Boolean

Returns:

  • (Boolean)


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# File 'lib/origen/site_config/config.rb', line 194

def local?
  type == :local
end

#needs_refresh?Boolean

Returns:

  • (Boolean)


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# File 'lib/origen/site_config/config.rb', line 35

def needs_refresh?
  if centralized?
    if refresh_time < 0
      false
    elsif cached?
      # If the refresh time is 0, this will always be true
      # Note the difference of time objects below will give the difference in seconds.
      (Time.now - cached_file.ctime) / 3600.0 > refresh_time
    else
      # If the cached file cannot be found, force a new fetch
      true
    end
  else
    false
  end
end

#read_erb(erb) ⇒ Object



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# File 'lib/origen/site_config/config.rb', line 124

def read_erb(erb)
  ERB.new(File.read(erb), 0, '%<>')
end

#refresh_timeObject



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# File 'lib/origen/site_config/config.rb', line 52

def refresh_time
  parent.find_val('centralized_site_config_refresh')
end

#remove_var(var) ⇒ Object



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# File 'lib/origen/site_config/config.rb', line 176

def remove_var(var)
  @values.delete(var)
end

#runtime?Boolean

Returns:

  • (Boolean)


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# File 'lib/origen/site_config/config.rb', line 202

def runtime?
  type == :runtime
end