Class: H2::Server::Stream::PushPromise

Inherits:
Object
  • Object
show all
Includes:
HeaderStringifier, ContentEncoder
Defined in:
lib/h2/server/stream/push_promise.rb

Defined Under Namespace

Classes: FSM

Constant Summary collapse

GET = 
'GET'
STATUS = 
'200'

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from ContentEncoder

#check_accept_encoding

Constructor Details

#initialize(path:, headers: {}, body: nil) ⇒ PushPromise

build a new PushPromise for the path, with the headers and body given



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# File 'lib/h2/server/stream/push_promise.rb', line 15

def initialize path:, headers: {}, body: nil
  @path = path
  @body = body
  @headers = headers

  @promise_headers = {
    METHOD_KEY    => GET,
    AUTHORITY_KEY => headers.delete(AUTHORITY_KEY),
    PATH_KEY      => @path,
    SCHEME_KEY    => headers.delete(SCHEME_KEY)
  }

  @fsm = FSM.new
end

Instance Attribute Details

#content_length ⇒ Object (readonly)

Returns the value of attribute content_length.



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# File 'lib/h2/server/stream/push_promise.rb', line 11

def content_length
  @content_length
end

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/h2/server/stream/push_promise.rb', line 11

def path
  @path
end

#push_stream ⇒ Object (readonly)

Returns the value of attribute push_stream.



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# File 'lib/h2/server/stream/push_promise.rb', line 11

def push_stream
  @push_stream
end

Instance Method Details

#cancel! ⇒ Object

cancel this promise, most likely due to a RST_STREAM frame from the client (already in cache, etc…)



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# File 'lib/h2/server/stream/push_promise.rb', line 94

def cancel!
  @fsm.transition :canceled
  @stream.on_complete
end

#canceled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/h2/server/stream/push_promise.rb', line 87

def canceled?
  @fsm.state == :canceled
end

#keep(size = nil) ⇒ Object

deliver the body for this promise, optionally splicing into size chunks



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# File 'lib/h2/server/stream/push_promise.rb', line 57

def keep size = nil
  return false unless @fsm.state == :made

  if size.nil?
    @push_stream.data @body
  else
    body = @body

    if body.bytesize > size
      body = @body.dup
      while body.bytesize > size
        @push_stream.data body.slice!(0, size), end_stream: false
        yield if block_given?
      end
    else
      yield if block_given?
    end

    @push_stream.data body
  end

  @fsm.transition :kept
  log :info, self
  @stream.on_complete
end

#keep_async ⇒ Object 



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# File 'lib/h2/server/stream/push_promise.rb', line 51

def keep_async
  @stream.connection.server.async.handle_push_promise self
end

#kept? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/h2/server/stream/push_promise.rb', line 83

def kept?
  @fsm.state == :kept
end

#log(level, msg) ⇒ Object 



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# File 'lib/h2/server/stream/push_promise.rb', line 99

def log level, msg
  Logger.__send__ level, "[stream #{@push_stream.id}] #{msg}"
end

#make_on(stream) ⇒ Object

create a new promise stream from stream, send the headers and set @push_stream from the callback



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# File 'lib/h2/server/stream/push_promise.rb', line 33

def make_on stream
  return unless @fsm.state == :init
  @stream  = stream
  @headers = {STATUS_KEY => STATUS}.merge stringify_headers(@headers)

  check_accept_encoding
  @content_length = @body.bytesize.to_s
  @headers.merge! CONTENT_LENGTH_KEY => @content_length

  @stream.stream.promise(@promise_headers, end_headers: false) do |push|
    push.headers @headers
    @push_stream = push
    @push_stream.on(:close){|err| cancel! if err == :cancel}
  end
  @fsm.transition :made
  self
end

#to_s ⇒ Object Also known as: to_str 



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# File 'lib/h2/server/stream/push_promise.rb', line 103

def to_s
  request = @stream.request
  %{#{request.addr} "push #{@path} HTTP/2" #{STATUS} #{@content_length}}
end