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|
# frozen_string_literal: true
module HTTPX
module Plugins
# This plugin makes a session reuse the same selector across all fibers in a given thread.
#
# This enables integration with fiber scheduler implementations such as [async](https://github.com/async).
#
# # https://gitlab.com/os85/httpx/wikis/Fiber-Concurrency
#
module FiberConcurrency
def self.subplugins
{
h2c: FiberConcurrencyH2C,
stream: FiberConcurrencyStream,
}
end
module InstanceMethods
private
def send_request(request, *)
request.set_context!
super
end
def get_current_selector
super(&nil) || begin
return unless block_given?
default = yield
set_current_selector(default)
default
end
end
end
module RequestMethods
# the execution context (fiber) this request was sent on.
attr_reader :context
def initialize(*)
super
@context = nil
end
# sets the execution context for this request. the default is the current fiber.
def set_context!
@context ||= Fiber.current # rubocop:disable Naming/MemoizedInstanceVariableName
end
# checks whether the current execution context is the one where the request was created.
def current_context?
@context == Fiber.current
end
def complete!(response = @response)
@context = nil
super
end
end
module ConnectionMethods
def current_context?
@pending.any?(&:current_context?) || (
@sibling && @sibling.pending.any?(&:current_context?)
)
end
def interests
return if connecting? && @pending.none?(&:current_context?)
super
end
def send(request)
# DoH requests bypass the session, so context needs to be set here.
request.set_context!
super
end
end
module HTTP1Methods
def interests
request = @request || @requests.first
return unless request
return unless request.current_context? || @requests.any?(&:current_context?) || @pending.any?(&:current_context?)
super
end
end
module HTTP2Methods
def initialize(*)
super
@contexts = Hash.new { |hs, k| hs[k] = Set.new }
end
def interests
if @connection.state == :connected && @handshake_completed && !@contexts.key?(Fiber.current)
return :w unless @pings.empty?
return
end
super
end
def send(request, *)
add_to_context(request)
super
end
private
def on_close(_, error, _)
if error == :http_1_1_required
# remove all pending requests context
@pending.each do |req|
clear_from_context(req)
end
end
super
end
def on_stream_close(_, request, error)
clear_from_context(request) if error != :stream_closed && @streams.key?(request)
super
end
def teardown(request = nil)
super
if request
clear_from_context(request)
else
@contexts.clear
end
end
def add_to_context(request)
@contexts[request.context] << request
end
def clear_from_context(request)
requests = @contexts[request.context]
requests.delete(request)
@contexts.delete(request.context) if requests.empty?
end
end
module NativeResolverMethods
private
def calculate_interests
return if @queries.empty?
return unless @queries.values.any?(&:current_context?) || @connections.any?(&:current_context?)
super
end
end
module SystemResolverMethods
def interests
return unless @queries.any? { |_, conn| conn.current_context? }
super
end
end
module FiberConcurrencyH2C
module HTTP2Methods
def upgrade(request, *)
@contexts[request.context] << request
super
end
end
end
module FiberConcurrencyStream
module StreamResponseMethods
def close
unless @request.current_context?
@request.close
return
end
super
end
end
end
end
register_plugin :fiber_concurrency, FiberConcurrency
end
end
|
