Class: Puppet::Pops::Serialization::AbstractWriter

Inherits:
Object
  • Object
show all
Defined in:
lib/puppet/pops/serialization/abstract_writer.rb

Overview

Abstract class for protocol specific writers such as MsgPack or JSON The abstract write is capable of writing the primitive scalars:

  • Boolean

  • Integer

  • Float

  • String

and, by using extensions, also

  • Array start

  • Map start

  • Object start

  • Regexp

  • Version

  • VersionRange

  • Timespan

  • Timestamp

  • Default

Direct Known Subclasses

JSON::Writer

Instance Method Summary collapse

Constructor Details

#initialize(packer, options, extension_packer = nil) ⇒ AbstractWriter

Returns a new instance of AbstractWriter.

Parameters:

  • packer (MessagePack::Packer, JSON::Packer) —

    the underlying packer stream

  • options (Hash)
  • extension_packer (DebugPacker, nil) (defaults to: nil) —

    Optional specific extension packer. Only used for debug output

Options Hash (options):

  • :tabulate (Boolean) —

    ‘true` if tabulation is enabled (which is the default).



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# File 'lib/puppet/pops/serialization/abstract_writer.rb', line 33

def initialize(packer, options, extension_packer = nil)
  @tabulate = options[:tabulate]
  @tabulate = true if @tabulate.nil?
  @written = {}
  @packer = packer
  @extension_packer = extension_packer.nil? ? packer : extension_packer
  register_types
end

Instance Method Details

#build_payload ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Called from extension callbacks only

Raises:



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# File 'lib/puppet/pops/serialization/abstract_writer.rb', line 76

def build_payload
  raise SerializationError, "Internal error: Class #{self.class} does not implement method 'build_payload'"
end

#extension_packer ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/puppet/pops/serialization/abstract_writer.rb', line 81

def extension_packer
  @extension_packer
end

#finish ⇒ Object

Tell the underlying packer to flush.



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# File 'lib/puppet/pops/serialization/abstract_writer.rb', line 44

def finish
  @packer.flush
end

#register_type(extension_number, payload_class, &block) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/puppet/pops/serialization/abstract_writer.rb', line 111

def register_type(extension_number, payload_class, &block)
  @packer.register_type(extension_number, payload_class, &block)
end

#register_types ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/puppet/pops/serialization/abstract_writer.rb', line 116

def register_types
  # 0x00 - 0x0F are reserved for low-level serialization / tabulation extensions

  register_type(Extension::INNER_TABULATION, Extension::InnerTabulation) do |o|
    build_payload { |ep| ep.write(o.index) }
  end

  register_type(Extension::TABULATION, Extension::Tabulation) do |o|
    build_payload { |ep| ep.write(o.index) }
  end

  # 0x10 - 0x1F are reserved for structural extensions

  register_type(Extension::ARRAY_START, Extension::ArrayStart) do |o|
    build_payload { |ep| ep.write(o.size) }
  end

  register_type(Extension::MAP_START, Extension::MapStart) do |o|
    build_payload { |ep| ep.write(o.size) }
  end

  register_type(Extension::OBJECT_START, Extension::ObjectStart) do |o|
    build_payload { |ep| write_tpl_qname(ep, o.type_name); ep.write(o.attribute_count) }
  end

  # 0x20 - 0x2f reserved for special extension objects

  register_type(Extension::DEFAULT, Extension::Default) do |o|
    build_payload { |ep| }
  end

  register_type(Extension::COMMENT, Extension::Comment) do |o|
    build_payload { |ep| ep.write(o.comment) }
  end

  # 0x30 - 0x7f reserved for mapping of specific runtime classes

  register_type(Extension::REGEXP, Regexp) do |o|
    build_payload { |ep| ep.write(o.source) }
  end

  register_type(Extension::TYPE_REFERENCE, Types::PTypeReferenceType) do |o|
    build_payload { |ep| write_tpl_qname(ep, o.type_string) }
  end

  register_type(Extension::SYMBOL, Symbol) do |o|
    build_payload { |ep| ep.write(o.to_s) }
  end

  register_type(Extension::TIME, Time::Timestamp) do |o|
    build_payload { |ep| nsecs = o.nsecs; ep.write(nsecs / 1000000000); ep.write(nsecs % 1000000000) }
  end

  register_type(Extension::TIMESPAN, Time::Timespan) do |o|
    build_payload { |ep| nsecs = o.nsecs; ep.write(nsecs / 1000000000); ep.write(nsecs % 1000000000) }
  end

  register_type(Extension::VERSION, Semantic::Version) do |o|
    build_payload { |ep| ep.write(o.to_s) }
  end

  register_type(Extension::VERSION_RANGE, Semantic::VersionRange) do |o|
    build_payload { |ep| ep.write(o.to_s) }
  end

  register_type(Extension::SENSITIVE, Types::PSensitiveType::Sensitive) do |o|
    build_payload { |ep| ep.write(o.unwrap) }
  end

  register_type(Extension::BINARY, Types::PBinaryType::Binary) do |o|
    build_payload { |ep| ep.write(o.to_s) }
  end
end

#write(value) ⇒ Object

Write a value on the underlying stream



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# File 'lib/puppet/pops/serialization/abstract_writer.rb', line 50

def write(value)
  written = false
  case value
  when Integer
    # not tabulated, but integers larger than 64-bit cannot be allowed.
    raise SerializationError, 'Integer out of bounds' if value > MAX_INTEGER || value < MIN_INTEGER
  when Numeric, Symbol, Types::PSensitiveType::Sensitive, Extension::NotTabulated, true, false, nil
    # not tabulated
  else
    if @tabulate
      index = @written[value]
      if index.nil?
        @packer.write(value)
        written = true
        @written[value] = @written.size
      else
        value = Extension::InnerTabulation.new(index)
      end
    end
  end
  @packer.write(value) unless written
end

#write_tpl(ep, value) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Called from extension callbacks only

Raises:

  • (ArgumentError) 


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# File 'lib/puppet/pops/serialization/abstract_writer.rb', line 97

def write_tpl(ep, value)
  raise ArgumentError, 'Internal error. Integers cannot be tabulated in extension payload' if value.is_a?(Integer)
  if @tabulate
    index = @written[value]
    if index.nil?
      @written[value] = @written.size
    else
      value = index
    end
  end
  ep.write(value)
end

#write_tpl_qname(ep, qname) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Called from extension callbacks only



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# File 'lib/puppet/pops/serialization/abstract_writer.rb', line 88

def write_tpl_qname(ep, qname)
  names = qname.split('::')
  ep.write(names.size)
  names.each {|n| write_tpl(ep, n)}
end