RUBY-3097 add/use monotonic time for deadlines (#5491)

* RUBY-3097 add/use monotonic time for deadlines

* remove license and fix tests

Author: neilshweky

lib/mongoid.rb

@@ -15,7 +15,7 @@
 require 'concurrent-ruby'
 
 require "mongo"
-require 'mongo/active_support'
+require "mongo/active_support"
 
 require "mongoid/version"
 require "mongoid/deprecable"
@@ -27,6 +27,7 @@
 require "mongoid/tasks/database"
 require "mongoid/query_cache"
 require "mongoid/warnings"
+require "mongoid/utils"
 
 # If we are using Rails then we will include the Mongoid railtie. This has all
 # the nifty initializers that Mongoid needs.

lib/mongoid/utils.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module Mongoid
+
+  # @api private
+  module Utils
+
+    # This function should be used if you need to measure time.
+    # @example Calculate elapsed time.
+    #   starting = Utils.monotonic_time
+    #   # do something time consuming
+    #   ending = Utils.monotonic_time
+    #   puts "It took #{(ending - starting).to_i} seconds"
+    #
+    # @see https://blog.dnsimple.com/2018/03/elapsed-time-with-ruby-the-right-way/
+    #
+    # @return [Float] seconds according to monotonic clock
+    module_function def monotonic_time
+      Process.clock_gettime(Process::CLOCK_MONOTONIC)
+    end
+  end
+end

lib/mongoid/warnings.rb

@@ -23,7 +23,7 @@ def warning(id, message)
 
     warning :geo_haystack_deprecated, 'The geoHaystack type is deprecated.'
     warning :as_json_compact_deprecated, '#as_json :compact option is deprecated. Please call #compact on the returned Hash object instead.'
-    warning :symbol_type_deprecated, 'The BSON Symbol type is deprecated by MongoDB. Please use String or StringifiedSymbol field types instead of the Symbol field type'
+    warning :symbol_type_deprecated, 'The BSON Symbol type is deprecated by MongoDB. Please use String or StringifiedSymbol field types instead of the Symbol field type.'
     warning :legacy_readonly, 'The readonly! method will only mark the document readonly when the legacy_readonly feature flag is switched off.'
   end
 end

spec/integration/app_spec.rb

@@ -326,7 +326,7 @@ def clean_env
   end
 
   def wait_for_port(port, timeout, process)
-    deadline = Time.now + timeout
+    deadline = Mongoid::Utils.monotonic_time + timeout
     loop do
       begin
         Socket.tcp('localhost', port, nil, nil, connect_timeout: 0.5) do |socket|
@@ -336,7 +336,7 @@ def wait_for_port(port, timeout, process)
         unless process.alive?
           raise "Process #{process} died while waiting for port #{port}"
         end
-        if Time.now > deadline
+        if Mongoid::Utils.monotonic_time > deadline
           raise
         end
       end