Class: Px4LogReader::Reader

Inherits:
Object
  • Object
show all
Defined in:
lib/px4_log_reader/reader.rb

Instance Method Summary collapse

Constructor Details

#initialize(file, options) ⇒ Reader

Returns a new instance of Reader.



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# File 'lib/px4_log_reader/reader.rb', line 60

def initialize( file, options )

  opts = {
    cache_filename: '',
    buffer_size_kb: 10 * 1024
  }.merge( options )

  @message_descriptors = {}
  @buffers = LogBufferArray.new
  @descriptor_cache = nil
  @context = Context.new

  @log_file = file
  # @buffers.set_file( @log_file, load_buffers: true )

  @descriptor_cache = MessageDescriptorCache.new( opts[:cache_filename] )
end

Instance Method Details

#descriptors ⇒ Object 



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# File 'lib/px4_log_reader/reader.rb', line 78

def descriptors
  if @log_file && @message_descriptors.empty?
    if @descriptor_cache && @descriptor_cache.exist?
      @message_descriptors = @descriptor_cache.read_descriptors
    else
      @message_descriptors = LogFile::read_descriptors( @log_file, @descriptor_cache )
    end

    @message_descriptors[ FORMAT_MESSAGE.type ] = FORMAT_MESSAGE
  end

  return @message_descriptors
end

#each_message(options = {}, &block) ⇒ Object 



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# File 'lib/px4_log_reader/reader.rb', line 92

def each_message( options = {}, &block )

  opts ={
    with: [],        # white list - empty means all minus those in without list
    without: ['FMT'] # black list - includes types or names
  }.merge( options || {} )

  opts[:with].map! do |val|
    if val.class == String
      descriptor = descriptors.values.find { |desc| desc.name == val }
      val = descriptor.type
    end
  end

  opts[:without].map! do |val|
    if val.class == String
      descriptor = descriptors.values.find { |desc| desc.name == val }

      if descriptor
        val = descriptor.type
      else
        raise "Failed to find descriptor with name '#{val}'"
      end
    end
  end

  if block_given?

    loop do

      message = LogFile::read_message( @log_file, @message_descriptors )
      break if message.nil?

      # Added message to the set of latest messages.
      @context.set( message )

      if opts[:with].empty?
        if !opts[:without].include?( message.descriptor.name )
          yield message, @context
        end
      else
        if opts[:with].include?( message.descriptor.type )
          yield message, @context
        end
      end

    end

  else
    raise BlockRequiredError.new
  end

end