refactor and drop dependency on Async::IO

CHANGES.md

@@ -1,3 +1,8 @@
+next
+-----
+* refactor to make code Fiber Scheduler agnostic
+* remove Async::IO::CZTopSocket
+
 1.1.1 (1/4/2024)
 -----
 * speed up Async::IO#wait_readable and #wait_writable

README.md

@@ -13,24 +13,22 @@ mechanisms (like CURVE).
 
 ## Example with Async
 
-See [this example](https://github.com/paddor/cztop/blob/master/examples/async/):
+See [this example](https://github.com/paddor/cztop/blob/master/examples/async.rb):
 
 ```ruby
 #! /usr/bin/env ruby
 
-require 'cztop/async'
+require 'cztop'
 
 Async do |task|
   task.async do |t|
     socket = CZTop::Socket::REP.new("inproc://req_rep_example")
-    io     = Async::IO.try_convert socket
-
     socket.options.rcvtimeo = 50 # ms
 
     loop do
-      msg = io.receive
+      msg = socket.receive
       puts "<<< #{msg.to_a.inspect}"
-      io << msg.to_a.map(&:upcase)
+      socket << msg.to_a.map(&:upcase)
     rescue IO::TimeoutError
       break
     end
@@ -40,11 +38,10 @@ Async do |task|
 
   task.async do
     socket = CZTop::Socket::REQ.new("inproc://req_rep_example")
-    io     = Async::IO.try_convert socket
 
     10.times do |i|
-      io << "foobar ##{i}"
-      msg = io.receive
+      socket << "foobar ##{i}"
+      msg = socket.receive
       puts ">>> #{msg.to_a.inspect}"
     end
 
@@ -56,9 +53,8 @@ end
 
 Output:
 ```
-$ cd examples/async
-$ bundle
-$ /bin/time bundle exec ./async.rb
+$ cd examples
+$ time ./async.rb
 <<< ["foobar #0"]
 >>> ["FOOBAR #0"]
 <<< ["foobar #1"]
@@ -81,16 +77,20 @@ $ /bin/time bundle exec ./async.rb
 >>> ["FOOBAR #9"]
 REQ done.
 REP done.
-0.46user 0.09system 0:00.60elapsed 90%CPU (0avgtext+0avgdata 47296maxresident)k
-0inputs+0outputs (0major+13669minor)pagefaults 0swaps
+
+________________________________________________________
+Executed in  401.51 millis    fish           external
+   usr time  308.44 millis  605.00 micros  307.83 millis
+   sys time   40.08 millis  278.00 micros   39.81 millis
+
 ```
 
 ## Overview
 
 ### Features
 
 * Ruby idiomatic API
-* compatible with [Async](https://github.com/socketry/async) / [Async::IO](https://github.com/socketry/async-io)
+* Fiber Scheduler aware
 * errors as exceptions
 * CURVE security
 * supports CZMQ DRAFT API

cztop.gemspec

@@ -36,6 +36,5 @@ Gem::Specification.new do |spec|
 
   if RUBY_VERSION >= '3.1'
     spec.add_development_dependency "async", ">= 2.0.1"
-    spec.add_development_dependency "async-io"
   end
 end

lib/cztop/message.rb

@@ -61,6 +61,8 @@ def empty?
     #   returns with failure. Please report as bug.
     #
     def send_to(destination)
+      destination.wait_writable if Fiber.scheduler
+
       rc = Zmsg.send(ffi_delegate, destination)
       return if rc.zero?
 
@@ -79,6 +81,8 @@ def send_to(destination)
     # @raise [SystemCallError] for any other error code set after +zmsg_recv+
     #   returns with failure. Please report as bug.
     def self.receive_from(source)
+      source.wait_readable if Fiber.scheduler
+
       delegate = Zmsg.recv(source)
       return from_ffi_delegate(delegate) unless delegate.null?
 

lib/cztop/send_receive_methods.rb

@@ -35,5 +35,80 @@ def receive
       Message.receive_from(self)
     end
 
+
+    # Waits for socket to become readable.
+    def wait_readable(timeout = read_timeout)
+      return true if readable?
+
+      @fd_io ||= to_io
+
+      if timeout
+        timeout_at = now + timeout
+
+        while true
+          @fd_io.wait_readable(timeout)
+          break if readable? # NOTE: ZMQ FD can't be trusted 100%
+          raise ::IO::TimeoutError if now >= timeout_at
+        end
+      else
+        @fd_io.wait_readable until readable?
+      end
+    end
+
+
+    # Waits for socket to become writable.
+    def wait_writable(timeout = write_timeout)
+      return true if writable?
+
+      @fd_io ||= to_io
+
+      if timeout
+        timeout_at = now + timeout
+
+        while true
+          @fd_io.wait_writable(timeout)
+          break if writable? # NOTE: ZMQ FD can't be trusted 100%
+          raise ::IO::TimeoutError if now >= timeout_at
+        end
+      else
+        @fd_io.wait_writable until writable?
+      end
+    end
+
+
+    # @return [Float, nil] the timeout in seconds used by {IO#wait_readable}
+    def read_timeout
+      timeout = options.rcvtimeo
+
+      if timeout <= 0
+        timeout = nil
+      else
+        timeout = timeout.to_f / 1000
+      end
+
+      timeout
+    end
+
+
+    # @return [Float, nil] the timeout in seconds used by {IO#wait_writable}
+    def write_timeout
+      timeout = options.sndtimeo
+
+      if timeout <= 0
+        timeout = nil
+      else
+        timeout = timeout.to_f / 1000
+      end
+
+      timeout
+    end
+
+
+    private
+
+
+    def now
+      Process.clock_gettime(Process::CLOCK_MONOTONIC)
+    end
   end
 end

lib/cztop/zsock_options.rb

@@ -43,6 +43,12 @@ def fd
     end
 
 
+    # @return [IO] IO for FD
+    def to_io
+      IO.for_fd fd, autoclose: false
+    end
+
+
     # Used to access the options of a {Socket} or {Actor}.
     class OptionsAccessor