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 92

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 110

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 124

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