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# frozen_string_literal: true
# Released under the MIT License.
# Copyright, 2024-2025, by Samuel Williams.
require_relative "frame"
require_relative "padded"
require_relative "continuation_frame"
module Protocol
module HTTP2
# The PRIORITY_UPDATE frame is used by clients to signal the initial priority of a response, or to reprioritize a response or push stream. It carries the stream ID of the response and the priority in ASCII text, using the same representation as the Priority header field value.
#
# +-+-------------+-----------------------------------------------+
# |R| Prioritized Stream ID (31) |
# +-+-----------------------------+-------------------------------+
# | Priority Field Value (*) ...
# +---------------------------------------------------------------+
#
class PriorityUpdateFrame < Frame
TYPE = 0x10
FORMAT = "N".freeze
# Unpack the prioritized stream ID and priority field value.
# @returns [Array] An array containing the prioritized stream ID and priority field value.
def unpack
data = super
prioritized_stream_id = data.unpack1(FORMAT)
return prioritized_stream_id, data.byteslice(4, data.bytesize - 4)
end
# Pack the prioritized stream ID and priority field value into the frame.
# @parameter prioritized_stream_id [Integer] The stream ID to prioritize.
# @parameter data [String] The priority field value.
# @parameter options [Hash] Options for packing.
def pack(prioritized_stream_id, data, **options)
super([prioritized_stream_id].pack(FORMAT) + data, **options)
end
# Apply this PRIORITY_UPDATE frame to a connection for processing.
# @parameter connection [Connection] The connection to apply the frame to.
def apply(connection)
connection.receive_priority_update(self)
end
end
end
end
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